ws2812: add SPI based implementation

This is useful because it allows using the WS2812 driver on platforms without bitbanged WS2812 support and it may be the only option if disabling interrupts is impossible or impractical.
2026-07-27 11:08:41 +00:00 · 2020-12-27 00:37:09 +01:00
147 changed files with 2008 additions and 11461 deletions
@@ -1,2 +1 @@
 build
-.vscode/
@@ -1,68 +1,3 @@
-0.16.0
---
- **new devices**
-    - aht20: add device
-    - ina260: add new i2c device
-    - keypad: add 4x4 keypad driver (#226)
-    - max7219: add driver support
-    - mcp2515: add support for mcp2515 CAN device
-    - p1am: support the P1AM-100 hardware watchdog
-    - pcf8563: add support for pcf8563 real time clock
-    - servo: add driver using PWM
-    - tm1637: add support for tm1637 7-segment LED
-    - tone: add package for producing tones using the PWM interface
- **enhancements**
-    - pwm: update drivers with PWM to use new interface
-    - wifinina: Make TLS work over WiFiNINA Verified on Arduino Nano33 IoT and nina fw v1.4.5
-    - ssd1306: Enable reset screen for SSD1306 via I2C
-    - st7789: add scrolling functions to match st7735
- **bugfixes**
-    - wifinina:
-        - fix getMACAddress and getTime
-        - fix println + cleanup
-        - remove debug flag and remove unnecessary padding call
-        - fix padding and implement missing functions
-    - flash: fix EraseBlocks method which is erasing sectors instead
- **core**
-    - all: use interfaces for UART objects
-    - all: do not take the pointer of an I2C object
-    - adc: update drivers with ADC to use new config struct
- **testing**
-    - tester:
-        - add a mock for command-oriented i2c devices
-        - add 16-bit register mock device
-
- **docs**
-    - ssd1306: example of ssd1306 with 128x64 display over I2C
-    - wifinina:
-        - add information about Adafruit boards with ESP32 wifi coprocessors, and modify examples to remove code that was both not being used, and also prevented many Adafruit boards from being able to be targeted by the examples
-        - update docs to simplify the nina-fw update process
-        - example that connects to AP and prints ip addresses, time and mac
-    - p1am: documentation and example program
-    - add missing new drivers added since last release
-
-0.15.0
---
- **new devices**
-    - dht: add DHTXX thermometer
-    - mcp23017: new driver for MCP23017 (I2C port expander)
-    - bmp388: Add bmp388 support (#219)
- **enhancements**
-    - hd44780: add a mode to work with boards where the RW pin is grounded
-    - st7789: add scrolling functions to match st7735
-    - microbitmatrix: matrix now working on microbit v2
-    - ds1307: Better interface "ReadTime" instead of "Time"
-    - ws2812: make AVR support more robust
- **bugfixes**
-    - all: fix main package in examples
- **core**
-    - adc: update all drivers with ADC to use new config struct
-    - spi: remove machine.SPI and replace with drivers.SPI interface for almost all SPI drivers
- **testing**
-    - test: run unit tests against i2c drivers and any spi drivers without direct gpio
- **docs**
-    - st7789: correct errors on various godoc comments
-
 0.14.0
 ---
 - **new devices**
@@ -1,4 +1,4 @@
-Copyright (c) 2018-2021 The TinyGo Authors. All rights reserved.
+Copyright (c) 2018-2020 The TinyGo Authors. All rights reserved.

 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are
@@ -31,8 +31,6 @@ smoke-test:
 	@md5sum ./build/test.hex
 	tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/bmp280/main.go
 	@md5sum ./build/test.hex
-	tinygo build -size short -o ./build/test.hex -target=trinket-m0 ./examples/bmp388/main.go
-	@md5sum ./build/test.hex
 	tinygo build -size short -o ./build/test.hex -target=bluepill ./examples/ds1307/sram/main.go
 	@md5sum ./build/test.hex
 	tinygo build -size short -o ./build/test.hex -target=bluepill ./examples/ds1307/time/main.go
@@ -83,28 +81,18 @@ smoke-test:
 	@md5sum ./build/test.hex
 	tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/mag3110/main.go
 	@md5sum ./build/test.hex
-	tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/mcp23017/main.go
-	@md5sum ./build/test.hex
-	tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/mcp23017-multiple/main.go
-	@md5sum ./build/test.hex
 	tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/mcp3008/main.go
 	@md5sum ./build/test.hex
-	tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/mcp2515/main.go
-	@md5sum ./build/test.hex
 	tinygo build -size short -o ./build/test.hex -target=microbit ./examples/microbitmatrix/main.go
 	@md5sum ./build/test.hex
 	tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/mma8653/main.go
 	@md5sum ./build/test.hex
 	tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/mpu6050/main.go
 	@md5sum ./build/test.hex
-	tinygo build -size short -o ./build/test.hex -target=p1am-100 ./examples/p1am/main.go
-	@md5sum ./build/test.hex
 	tinygo build -size short -o ./build/test.hex -target=microbit ./examples/pcd8544/setbuffer/main.go
 	@md5sum ./build/test.hex
 	tinygo build -size short -o ./build/test.hex -target=microbit ./examples/pcd8544/setpixel/main.go
 	@md5sum ./build/test.hex
-	tinygo build -size short -o ./build/test.hex -target=arduino ./examples/servo
-	@md5sum ./build/test.hex
 	tinygo build -size short -o ./build/test.hex -target=pybadge ./examples/shifter/main.go
 	@md5sum ./build/test.hex
 	tinygo build -size short -o ./build/test.hex -target=microbit ./examples/sht3x/main.go
@@ -121,10 +109,6 @@ smoke-test:
 	@md5sum ./build/test.hex
 	tinygo build -size short -o ./build/test.hex -target=circuitplay-express ./examples/thermistor/main.go
 	@md5sum ./build/test.hex
-	tinygo build -size short -o ./build/test.hex -target=circuitplay-bluefruit ./examples/tone
-	@md5sum ./build/test.hex
-	tinygo build -size short -o ./build/test.hex -target=arduino-nano33 ./examples/tm1637/main.go
-	@md5sum ./build/test.hex
 	tinygo build -size short -o ./build/test.hex -target=pyportal ./examples/touch/resistive/fourwire/main.go
 	@md5sum ./build/test.hex
 	tinygo build -size short -o ./build/test.hex -target=pyportal ./examples/touch/resistive/pyportal_touchpaint/main.go
@@ -175,34 +159,11 @@ endif
 	@md5sum ./build/test.hex
 	tinygo build -size short -o ./build/test.hex -target=circuitplay-express ./examples/lis2mdl/main.go
 	@md5sum ./build/test.hex
-	tinygo build -size short -o ./build/test.hex -target=arduino-nano33 ./examples/max72xx/main.go
-	@md5sum ./build/test.hex
-	tinygo build -size short -o ./build/test.hex -target=feather-m0 ./examples/dht/main.go
-	@md5sum ./build/test.hex
-	tinygo build -size short -o ./build/test.hex -target=arduino ./examples/keypad4x4/main.go
-	@md5sum ./build/test.hex
-	tinygo build -size short -o ./build/test.hex -target=xiao ./examples/pcf8563/alarm/
-	@md5sum ./build/test.hex
-	tinygo build -size short -o ./build/test.hex -target=xiao ./examples/pcf8563/clkout/
-	@md5sum ./build/test.hex
-	tinygo build -size short -o ./build/test.hex -target=xiao ./examples/pcf8563/time/
-	@md5sum ./build/test.hex
-	tinygo build -size short -o ./build/test.hex -target=xiao ./examples/pcf8563/timer/
-	@md5sum ./build/test.hex
-	tinygo build -size short -o ./build/test.hex -target=feather-m0 ./examples/ina260/main.go
-	@md5sum ./build/test.hex
-	tinygo build -size short -o ./build/test.hex -target=nucleo-l432kc ./examples/aht20/main.go
-	@md5sum ./build/test.hex
-	tinygo build -size short -o ./build/test.hex -target=feather-m4 ./examples/sdcard/console/
-	@md5sum ./build/test.hex
-	tinygo build -size short -o ./build/test.hex -target=feather-m4 ./examples/sdcard/tinyfs/
-	@md5sum ./build/test.hex

 DRIVERS = $(wildcard */)
 NOTESTS = build examples flash semihosting pcd8544 shiftregister st7789 microphone mcp3008 gps microbitmatrix \
 		hcsr04 ssd1331 ws2812 thermistor apa102 easystepper ssd1351 ili9341 wifinina shifter hub75 \
-		hd44780 buzzer ssd1306 espat l9110x st7735 bmi160 l293x dht keypad4x4 max72xx p1am tone tm1637 \
-		pcf8563 mcp2515 servo sdcard
+		hd44780 buzzer ssd1306 espat l9110x st7735 bmi160 l293x
 TESTS = $(filter-out $(addsuffix /%,$(NOTESTS)),$(DRIVERS))

 unit-test:
@@ -3,7 +3,7 @@
 [![PkgGoDev](https://pkg.go.dev/badge/tinygo.org/x/drivers)](https://pkg.go.dev/tinygo.org/x/drivers) [![CircleCI](https://circleci.com/gh/tinygo-org/drivers/tree/dev.svg?style=svg)](https://circleci.com/gh/tinygo-org/drivers/tree/dev)


-This package provides a collection of hardware drivers for devices such as sensors and displays that can be used together with [TinyGo](https://tinygo.org).
+This package provides a collection of hardware drivers for devices that can be used together with [TinyGo](https://tinygo.org).

 ## Installing

@@ -52,13 +52,12 @@ func main() {

 ## Currently supported devices

-The following 66 devices are supported.
+The following 53 devices are supported.

 | Device Name | Interface Type |
 |----------|-------------|
 | [ADT7410 I2C Temperature Sensor](https://www.analog.com/media/en/technical-documentation/data-sheets/ADT7410.pdf) | I2C |
 | [ADXL345 accelerometer](http://www.analog.com/media/en/technical-documentation/data-sheets/ADXL345.pdf) | I2C |
-| [AHT20 I2C Temperature and Humidity Sensor](http://www.aosong.com/userfiles/files/media/AHT20%20%E8%8B%B1%E6%96%87%E7%89%88%E8%AF%B4%E6%98%8E%E4%B9%A6%20A0%2020201222.pdf) | I2C |
 | [AMG88xx 8x8 Thermal camera sensor](https://cdn-learn.adafruit.com/assets/assets/000/043/261/original/Grid-EYE_SPECIFICATIONS%28Reference%29.pdf) | I2C |
 | [APA102 RGB LED](https://cdn-shop.adafruit.com/product-files/2343/APA102C.pdf) | SPI |
 | [AT24CX 2-wire serial EEPROM](https://www.openimpulse.com/blog/wp-content/uploads/wpsc/downloadables/24C32-Datasheet.pdf) | I2C |
@@ -69,9 +68,7 @@ The following 66 devices are supported.
 | [BMI160 accelerometer/gyroscope](https://www.bosch-sensortec.com/media/boschsensortec/downloads/datasheets/bst-bmi160-ds000.pdf) | SPI |
 | [BMP180 barometer](https://cdn-shop.adafruit.com/datasheets/BST-BMP180-DS000-09.pdf) | I2C |
 | [BMP280 temperature/barometer](https://www.bosch-sensortec.com/media/boschsensortec/downloads/datasheets/bst-bmp280-ds001.pdf) | I2C |
-| [BMP388 pressure sensor](https://www.bosch-sensortec.com/media/boschsensortec/downloads/datasheets/bst-bmp388-ds001.pdf) | I2C |
 | [Buzzer](https://en.wikipedia.org/wiki/Buzzer#Piezoelectric) | GPIO |
-| [DHTXX thermometer and humidity sensor](https://cdn-shop.adafruit.com/datasheets/Digital+humidity+and+temperature+sensor+AM2302.pdf) | GPIO |
 | [DS1307 real time clock](https://datasheets.maximintegrated.com/en/ds/DS1307.pdf) | I2C |
 | [DS3231 real time clock](https://datasheets.maximintegrated.com/en/ds/DS3231.pdf) | I2C |
 | [ESP32 as WiFi Coprocessor with Arduino nina-fw](https://github.com/arduino/nina-fw) | SPI |
@@ -81,32 +78,23 @@ The following 66 devices are supported.
 | [HD44780 LCD controller](https://www.sparkfun.com/datasheets/LCD/HD44780.pdf) | GPIO/I2C |
 | [HUB75 RGB led matrix](https://cdn-learn.adafruit.com/downloads/pdf/32x16-32x32-rgb-led-matrix.pdf) | SPI |
 | [ILI9341 TFT color display](https://cdn-shop.adafruit.com/datasheets/ILI9341.pdf) | SPI |
-| [INA260 Volt/Amp/Power meter](https://www.ti.com/lit/ds/symlink/ina260.pdf) | I2C |
-| [4x4 Membrane Keypad](https://cdn.sparkfun.com/assets/f/f/a/5/0/DS-16038.pdf) | GPIO |
 | [L293x motor driver](https://www.ti.com/lit/ds/symlink/l293d.pdf) | GPIO/PWM |
 | [L9110x motor driver](https://www.elecrow.com/download/datasheet-l9110.pdf) | GPIO/PWM |
 | [LIS2MDL magnetometer](https://www.st.com/resource/en/datasheet/lis2mdl.pdf) | I2C |
 | [LIS3DH accelerometer](https://www.st.com/resource/en/datasheet/lis3dh.pdf) | I2C |
 | [LSM6DS3 accelerometer](https://www.st.com/resource/en/datasheet/lsm6ds3.pdf) | I2C |
 | [MAG3110 magnetometer](https://www.nxp.com/docs/en/data-sheet/MAG3110.pdf) | I2C |
-| [MAX7219 & MAX7221 display driver](https://datasheets.maximintegrated.com/en/ds/MAX7219-MAX7221.pdf) | SPI |
-| [MCP23017 port expander](https://ww1.microchip.com/downloads/en/DeviceDoc/20001952C.pdf) | I2C |
 | [MCP3008 analog to digital converter (ADC)](http://ww1.microchip.com/downloads/en/DeviceDoc/21295d.pdf) | SPI |
-| [MCP2515 Stand-Alone CAN Controller with SPI Interface](https://ww1.microchip.com/downloads/en/DeviceDoc/MCP2515-Family-Data-Sheet-DS20001801K.pdf) | SPI |
 | [Microphone - PDM](https://cdn-learn.adafruit.com/assets/assets/000/049/977/original/MP34DT01-M.pdf) | I2S/PDM |
 | [MMA8653 accelerometer](https://www.nxp.com/docs/en/data-sheet/MMA8653FC.pdf) | I2C |
 | [MPU6050 accelerometer/gyroscope](https://store.invensense.com/datasheets/invensense/MPU-6050_DataSheet_V3%204.pdf) | I2C |
-| [P1AM-100 Base Controller](https://facts-engineering.github.io/modules/P1AM-100/P1AM-100.html) | SPI |
 | [PCD8544 display](http://eia.udg.edu/~forest/PCD8544_1.pdf) | SPI |
-| [PCF8563 real time clock](https://www.nxp.com/docs/en/data-sheet/PCF8563.pdf) | I2C |
 | [Resistive Touchscreen (4-wire)](http://ww1.microchip.com/downloads/en/Appnotes/doc8091.pdf) | GPIO |
 | [Semihosting](https://wiki.segger.com/Semihosting) | Debug |
-| [Servo](https://learn.sparkfun.com/tutorials/hobby-servo-tutorial/all) | PWM |
 | [Shift register (PISO)](https://en.wikipedia.org/wiki/Shift_register#Parallel-in_serial-out_\(PISO\)) | GPIO |
 | [Shift registers (SIPO)](https://en.wikipedia.org/wiki/Shift_register#Serial-in_parallel-out_(SIPO)) | GPIO |
 | [SHT3x Digital Humidity Sensor](https://www.sensirion.com/fileadmin/user_upload/customers/sensirion/Dokumente/0_Datasheets/Humidity/Sensirion_Humidity_Sensors_SHT3x_Datasheet_digital.pdf) | I2C |
 | [SPI NOR Flash Memory](https://en.wikipedia.org/wiki/Flash_memory#NOR_flash) | SPI/QSPI |
-| [SPI SDCARD/MMC](https://en.wikipedia.org/wiki/SD_card) | SPI |
 | [SSD1306 OLED display](https://cdn-shop.adafruit.com/datasheets/SSD1306.pdf) | I2C / SPI |
 | [SSD1331 TFT color display](https://www.crystalfontz.com/controllers/SolomonSystech/SSD1331/381/) | SPI |
 | [SSD1351 OLED display](https://download.mikroe.com/documents/datasheets/ssd1351-revision-1.3.pdf) | SPI |
@@ -114,7 +102,6 @@ The following 66 devices are supported.
 | [ST7789 TFT color display](https://cdn-shop.adafruit.com/product-files/3787/3787_tft_QT154H2201__________20190228182902.pdf) | SPI |
 | [Stepper motor "Easystepper" controller](https://en.wikipedia.org/wiki/Stepper_motor) | GPIO |
 | [Thermistor](https://www.farnell.com/datasheets/33552.pdf) | ADC |
-| [TM1637 7-segment LED display](https://www.mcielectronics.cl/website_MCI/static/documents/Datasheet_TM1637.pdf) | I2C |
 | [TMP102 I2C Temperature Sensor](https://download.mikroe.com/documents/datasheets/tmp102-data-sheet.pdf) | I2C |
 | [VEML6070 UV light sensor](https://www.vishay.com/docs/84277/veml6070.pdf) | I2C |
 | [VL53L1X time-of-flight distance sensor](https://www.st.com/resource/en/datasheet/vl53l1x.pdf) | I2C |
@@ -18,13 +18,13 @@ func TestWhoAmI(t *testing.T) {
 	c := qt.New(t)
 	bus := tester.NewI2CBus(c)
 	fake := tester.NewI2CDevice(c, Address)
-	copy(fake.Registers[:], defaultRegisters())
+	fake.SetupRegisters(defaultRegisters())
 	bus.AddDevice(fake)

 	dev := New(bus)
 	c.Assert(dev.Connected(), qt.Equals, true)

-	fake.Registers[RegID] = 0x99
+	fake.SetupRegister(RegID, 0x99)
 	c.Assert(dev.Connected(), qt.Equals, false)
 }

@@ -1,108 +0,0 @@
-package aht20
-
-import (
-	"time"
-
-	"tinygo.org/x/drivers"
-)
-
-// Device wraps an I2C connection to an AHT20 device.
-type Device struct {
-	bus      drivers.I2C
-	Address  uint16
-	humidity uint32
-	temp     uint32
-}
-
-// New creates a new AHT20 connection. The I2C bus must already be
-// configured.
-//
-// This function only creates the Device object, it does not touch the device.
-func New(bus drivers.I2C) Device {
-	return Device{
-		bus:     bus,
-		Address: Address,
-	}
-}
-
-// Configure the device
-func (d *Device) Configure() {
-	// Check initialization state
-	status := d.Status()
-	if status&0x08 == 1 {
-		// Device is initialized
-		return
-	}
-
-	// Force initialization
-	d.bus.Tx(d.Address, []byte{CMD_INITIALIZE, 0x08, 0x00}, nil)
-	time.Sleep(10 * time.Millisecond)
-}
-
-// Reset the device
-func (d *Device) Reset() {
-	d.bus.Tx(d.Address, []byte{CMD_SOFTRESET}, nil)
-}
-
-// Status of the device
-func (d *Device) Status() byte {
-	data := []byte{0}
-
-	d.bus.Tx(d.Address, []byte{CMD_STATUS}, data)
-
-	return data[0]
-}
-
-// Read the temperature and humidity
-//
-// The actual temperature and humidity are stored
-// and can be accessed using `Temp` and `Humidity`.
-func (d *Device) Read() error {
-	d.bus.Tx(d.Address, []byte{CMD_TRIGGER, 0x33, 0x00}, nil)
-
-	data := []byte{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}
-	for retry := 0; retry < 3; retry++ {
-		time.Sleep(80 * time.Millisecond)
-		err := d.bus.Tx(d.Address, nil, data)
-		if err != nil {
-			return err
-		}
-
-		// If measurement complete, store values
-		if data[0]&0x04 != 0 && data[0]&0x80 == 0 {
-			d.humidity = uint32(data[1])<<12 | uint32(data[2])<<4 | uint32(data[3])>>4
-			d.temp = (uint32(data[3])&0xF)<<16 | uint32(data[4])<<8 | uint32(data[5])
-			return nil
-		}
-	}
-
-	return ErrTimeout
-}
-
-func (d *Device) RawHumidity() uint32 {
-	return d.humidity
-}
-
-func (d *Device) RawTemp() uint32 {
-	return d.temp
-}
-
-func (d *Device) RelHumidity() float32 {
-	return (float32(d.humidity) * 100) / 0x100000
-}
-
-func (d *Device) DeciRelHumidity() int32 {
-	return (int32(d.humidity) * 1000) / 0x100000
-}
-
-// Temperature in degrees celsius
-func (d *Device) Celsius() float32 {
-	return (float32(d.temp*200.0) / 0x100000) - 50
-}
-
-// Temperature in mutiples of one tenth of a degree celsius
-//
-// Using this method avoids floating point calculations.
-func (d *Device) DeciCelsius() int32 {
-	return ((int32(d.temp) * 2000) / 0x100000) - 500
-}
@@ -1,74 +0,0 @@
-package aht20
-
-import (
-	"testing"
-
-	qt "github.com/frankban/quicktest"
-	"tinygo.org/x/drivers/tester"
-)
-
-func TestDefaultI2CAddress(t *testing.T) {
-	c := qt.New(t)
-	bus := tester.NewI2CBus(c)
-	dev := New(bus)
-	c.Assert(uint8(dev.Address), qt.Equals, uint8(Address))
-}
-
-func TestInitialization(t *testing.T) {
-	c := qt.New(t)
-	bus := tester.NewI2CBus(c)
-	fdev := tester.NewI2CDeviceCmd(c, Address)
-	fdev.Commands = defaultCommands()
-	bus.AddDevice(fdev)
-
-	// Set status to uninitialized to force initialization
-	fdev.Commands[CMD_STATUS].Response[0] = 0x0C
-
-	dev := New(bus)
-	dev.Configure()
-
-	// Check initialization command invoked
-	c.Assert(fdev.Commands[CMD_INITIALIZE].Invocations > 0, qt.Equals, true)
-}
-
-func TestRead(t *testing.T) {
-	c := qt.New(t)
-	bus := tester.NewI2CBus(c)
-	fdev := tester.NewI2CDeviceCmd(c, Address)
-	fdev.Commands = defaultCommands()
-	bus.AddDevice(fdev)
-
-	dev := New(bus)
-	dev.Read()
-
-	// Should be 25deg (250 decidegrees)
-	c.Assert(dev.DeciCelsius(), qt.Equals, int32(250))
-
-	// Should be 36.3% (363 decipercent)
-	c.Assert(dev.DeciRelHumidity(), qt.Equals, int32(363))
-}
-
-func defaultCommands() map[uint8]*tester.Cmd {
-	return map[uint8]*tester.Cmd{
-		CMD_INITIALIZE: {
-			Command:  []byte{0xBE},
-			Mask:     []byte{0xFF},
-			Response: []byte{},
-		},
-		CMD_TRIGGER: {
-			Command:  []byte{0xAC, 0x33, 0x00},
-			Mask:     []byte{0xFF, 0xFF, 0xFF},
-			Response: []byte{0x1C, 0x5D, 0x10, 0x66, 0x01, 0xD2, 0x93},
-		},
-		CMD_SOFTRESET: {
-			Command:  []byte{0xBA},
-			Mask:     []byte{0xFF},
-			Response: []byte{},
-		},
-		CMD_STATUS: {
-			Command:  []byte{0x71},
-			Mask:     []byte{0xFF},
-			Response: []byte{0x1C},
-		},
-	}
-}
@@ -1,20 +0,0 @@
-package aht20
-
-import "errors"
-
-const (
-	Address = 0x38
-
-	CMD_INITIALIZE = 0xBE
-	CMD_STATUS     = 0x71
-	CMD_TRIGGER    = 0xAC
-	CMD_SOFTRESET  = 0xBA
-
-	STATUS_BUSY       = 0x80
-	STATUS_CALIBRATED = 0x08
-)
-
-var (
-	ErrBusy    = errors.New("device busy")
-	ErrTimeout = errors.New("timeout")
-)
@@ -27,46 +27,44 @@ var startFrame = []byte{0x00, 0x00, 0x00, 0x00}
 type Device struct {
 	bus   drivers.SPI
 	Order int
-	buf   [4]byte
 }

 // New returns a new APA102 driver. Pass in a fully configured SPI bus.
-func New(b drivers.SPI) *Device {
-	return &Device{bus: b, Order: BGR}
+func New(b drivers.SPI) Device {
+	return Device{bus: b, Order: BGR}
 }

 // NewSoftwareSPI returns a new APA102 driver that will use a software based
 // implementation of the SPI protocol.
-func NewSoftwareSPI(sckPin, sdoPin machine.Pin, delay uint32) *Device {
+func NewSoftwareSPI(sckPin, sdoPin machine.Pin, delay uint32) Device {
 	return New(&bbSPI{SCK: sckPin, SDO: sdoPin, Delay: delay})
 }

 // WriteColors writes the given RGBA color slice out using the APA102 protocol.
 // The A value (Alpha channel) is used for brightness, set to 0xff (255) for maximum.
-func (d *Device) WriteColors(cs []color.RGBA) (n int, err error) {
+func (d Device) WriteColors(cs []color.RGBA) (n int, err error) {
 	d.startFrame()

 	// write data
 	for _, c := range cs {
 		// brightness is scaled to 5 bit value
-		d.buf[0] = 0xe0 | (c.A >> 3)
+		d.bus.Transfer(0xe0 | (c.A >> 3))

 		// set the colors
 		switch d.Order {
 		case BRG:
-			d.buf[1] = c.B
-			d.buf[2] = c.R
-			d.buf[3] = c.G
+			d.bus.Transfer(c.B)
+			d.bus.Transfer(c.R)
+			d.bus.Transfer(c.G)
 		case GRB:
-			d.buf[1] = c.G
-			d.buf[2] = c.R
-			d.buf[3] = c.B
+			d.bus.Transfer(c.G)
+			d.bus.Transfer(c.R)
+			d.bus.Transfer(c.B)
 		case BGR:
-			d.buf[1] = c.B
-			d.buf[2] = c.G
-			d.buf[3] = c.R
+			d.bus.Transfer(c.B)
+			d.bus.Transfer(c.G)
+			d.bus.Transfer(c.R)
 		}
-		d.bus.Tx(d.buf[:], nil)
 	}

 	d.endFrame(len(cs))
@@ -75,7 +73,7 @@ func (d *Device) WriteColors(cs []color.RGBA) (n int, err error) {
 }

 // Write the raw bytes using the APA102 protocol.
-func (d *Device) Write(buf []byte) (n int, err error) {
+func (d Device) Write(buf []byte) (n int, err error) {
 	d.startFrame()
 	d.bus.Tx(buf, nil)
 	d.endFrame(len(buf) / 4)
@@ -84,14 +82,14 @@ func (d *Device) Write(buf []byte) (n int, err error) {
 }

 // startFrame sends the start bytes for a strand of LEDs.
-func (d *Device) startFrame() {
+func (d Device) startFrame() {
 	d.bus.Tx(startFrame, nil)
 }

 // endFrame sends the end frame marker with one extra bit per LED so
 // long strands of LEDs receive the necessary termination for updates.
 // See https://cpldcpu.wordpress.com/2014/11/30/understanding-the-apa102-superled/
-func (d *Device) endFrame(count int) {
+func (d Device) endFrame(count int) {
 	for i := 0; i < count/16; i++ {
 		d.bus.Transfer(0xff)
 	}
@@ -13,8 +13,6 @@ type DeviceSPI struct {
 	// Chip select pin
 	CSB machine.Pin

-	buf [7]byte
-
 	// SPI bus (requires chip select to be usable).
 	Bus drivers.SPI
 }
@@ -82,10 +80,7 @@ func (d *DeviceSPI) Reset() error {

 // ReadTemperature returns the temperature in celsius milli degrees (°C/1000).
 func (d *DeviceSPI) ReadTemperature() (temperature int32, err error) {
-	data := d.buf[:3]
-	data[0] = 0x80 | reg_TEMPERATURE_0
-	data[1] = 0
-	data[2] = 0
+	data := []byte{0x80 | reg_TEMPERATURE_0, 0, 0}
 	d.CSB.Low()
 	err = d.Bus.Tx(data, data)
 	d.CSB.High()
@@ -118,11 +113,7 @@ func (d *DeviceSPI) ReadTemperature() (temperature int32, err error) {
 // and the sensor is not moving the returned value will be around 1000000 or
 // -1000000.
 func (d *DeviceSPI) ReadAcceleration() (x int32, y int32, z int32, err error) {
-	data := d.buf[:7]
-	data[0] = 0x80 | reg_ACC_XL
-	for i := 1; i < len(data); i++ {
-		data[i] = 0
-	}
+	data := []byte{0x80 | reg_ACC_XL, 0, 0, 0, 0, 0, 0}
 	d.CSB.Low()
 	err = d.Bus.Tx(data, data)
 	d.CSB.High()
@@ -148,11 +139,7 @@ func (d *DeviceSPI) ReadAcceleration() (x int32, y int32, z int32, err error) {
 // rotation along one axis and while doing so integrate all values over time,
 // you would get a value close to 360000000.
 func (d *DeviceSPI) ReadRotation() (x int32, y int32, z int32, err error) {
-	data := d.buf[:7]
-	data[0] = 0x80 | reg_GYR_XL
-	for i := 1; i < len(data); i++ {
-		data[i] = 0
-	}
+	data := []byte{0x80 | reg_GYR_XL, 0, 0, 0, 0, 0, 0}
 	d.CSB.Low()
 	err = d.Bus.Tx(data, data)
 	d.CSB.High()
@@ -198,9 +185,7 @@ func (d *DeviceSPI) readRegister(address uint8) uint8 {
 	// I don't know why but it appears necessary to sleep for a bit here.
 	time.Sleep(time.Millisecond)

-	data := d.buf[:2]
-	data[0] = 0x80 | address
-	data[1] = 0
+	data := []byte{0x80 | address, 0}
 	d.CSB.Low()
 	d.Bus.Tx(data, data)
 	d.CSB.High()
@@ -213,11 +198,7 @@ func (d *DeviceSPI) writeRegister(address, data uint8) {
 	// I don't know why but it appears necessary to sleep for a bit here.
 	time.Sleep(time.Millisecond)

-	buf := d.buf[:2]
-	buf[0] = address
-	buf[1] = data
-
 	d.CSB.Low()
-	d.Bus.Tx(buf, buf)
+	d.Bus.Tx([]byte{address, data}, []byte{0, 0})
 	d.CSB.High()
 }
@@ -1,249 +0,0 @@
-package bmp388
-
-import (
-	"errors"
-
-	"tinygo.org/x/drivers"
-)
-
-var (
-	errConfigWrite  = errors.New("bmp388: failed to configure sensor, check connection")
-	errConfig       = errors.New("bmp388: there is a problem with the configuration, try reducing ODR")
-	errCaliRead     = errors.New("bmp388: failed to read calibration coefficient register")
-	errSoftReset    = errors.New("bmp388: failed to perform a soft reset")
-	errNotConnected = errors.New("bmp388: not connected")
-)
-
-type Oversampling byte
-type Mode byte
-type OutputDataRate byte
-type FilterCoefficient byte
-
-// Config contains settings for filtering, sampling, and modes of operation
-type Config struct {
-	Pressure    Oversampling
-	Temperature Oversampling
-	Mode        Mode
-	ODR         OutputDataRate
-	IIR         FilterCoefficient
-}
-
-// Device wraps the I2C connection and configuration values for the BMP388
-type Device struct {
-	bus     drivers.I2C
-	Address uint8
-	cali    calibrationCoefficients
-	Config  Config
-}
-
-type calibrationCoefficients struct {
-	// Temperature compensation
-	t1 uint16
-	t2 uint16
-	t3 int8
-
-	// Pressure compensation
-	p1  int16
-	p2  int16
-	p3  int8
-	p4  int8
-	p5  uint16
-	p6  uint16
-	p7  int8
-	p8  int8
-	p9  int16
-	p10 int8
-	p11 int8
-}
-
-// New returns a bmp388 struct with the default I2C address. Configure must also be called after instanting
-func New(bus drivers.I2C) Device {
-	return Device{
-		bus:     bus,
-		Address: Address,
-	}
-}
-
-// Configure can enable settings on the BMP388 and reads the calibration coefficients
-func (d *Device) Configure(config Config) (err error) {
-	d.Config = config
-
-	if d.Config == (Config{}) {
-		d.Config.Mode = Normal
-	}
-
-	// Turning on the pressure and temperature sensors and setting the measurement mode
-	err = d.writeRegister(RegPwrCtrl, PwrPress|PwrTemp|byte(d.Config.Mode))
-
-	// Configure the oversampling, output data rate, and iir filter coefficient settings
-	err = d.writeRegister(RegOSR, byte(d.Config.Pressure|d.Config.Temperature<<3))
-	err = d.writeRegister(RegODR, byte(d.Config.ODR))
-	err = d.writeRegister(RegIIR, byte(d.Config.IIR<<1))
-
-	if err != nil {
-		return errConfigWrite
-	}
-
-	// Check if there is a problem with the given configuration
-	if d.configurationError() {
-		return errConfig
-	}
-
-	// Reading the builtin calibration coefficients and parsing them per the datasheet. The compensation formula given
-	// in the datasheet is implemented in floating point
-	buffer, err := d.readRegister(RegCali, 21)
-	if err != nil {
-		return errCaliRead
-	}
-
-	d.cali.t1 = uint16(buffer[1])<<8 | uint16(buffer[0])
-	d.cali.t2 = uint16(buffer[3])<<8 | uint16(buffer[2])
-	d.cali.t3 = int8(buffer[4])
-
-	d.cali.p1 = int16(buffer[6])<<8 | int16(buffer[5])
-	d.cali.p2 = int16(buffer[8])<<8 | int16(buffer[7])
-	d.cali.p3 = int8(buffer[9])
-	d.cali.p4 = int8(buffer[10])
-	d.cali.p5 = uint16(buffer[12])<<8 | uint16(buffer[11])
-	d.cali.p6 = uint16(buffer[14])<<8 | uint16(buffer[13])
-	d.cali.p7 = int8(buffer[15])
-	d.cali.p8 = int8(buffer[16])
-	d.cali.p9 = int16(buffer[18])<<8 | int16(buffer[17])
-	d.cali.p10 = int8(buffer[19])
-	d.cali.p11 = int8(buffer[20])
-
-	return nil
-}
-
-// Read the temperature registers and compute a compensation value for the temperature and pressure compensation
-// calculations. This is not the temperature itself.
-func (d *Device) tlinCompensate() (int64, error) {
-	rawTemp, err := d.readSensorData(RegTemp)
-	if err != nil {
-		return 0, err
-	}
-
-	// pulled from C driver: https://github.com/BoschSensortec/BMP3-Sensor-API/blob/master/bmp3.c
-	partialData1 := rawTemp - (256 * int64(d.cali.t1))
-	partialData2 := int64(d.cali.t2) * partialData1
-	partialData3 := (partialData1 * partialData1)
-	partialData4 := partialData3 * int64(d.cali.t3)
-	partialData5 := (partialData2 * 262144) + partialData4
-	return partialData5 / 4294967296, nil
-
-}
-
-// ReadTemperature returns the temperature in centicelsius, i.e 2426 / 100 = 24.26 C
-func (d *Device) ReadTemperature() (int32, error) {
-
-	tlin, err := d.tlinCompensate()
-	if err != nil {
-		return 0, err
-	}
-
-	temp := (tlin * 25) / 16384
-	return int32(temp), nil
-}
-
-// ReadPressure returns the pressure in centipascals, i.e 10132520 / 100 = 101325.20 Pa
-func (d *Device) ReadPressure() (int32, error) {
-
-	tlin, err := d.tlinCompensate()
-	if err != nil {
-		return 0, err
-	}
-	rawPress, err := d.readSensorData(RegPress)
-	if err != nil {
-		return 0, err
-	}
-
-	// code pulled from bmp388 C driver: https://github.com/BoschSensortec/BMP3-Sensor-API/blob/master/bmp3.c
-	partialData1 := tlin * tlin
-	partialData2 := partialData1 / 64
-	partialData3 := (partialData2 * tlin) / 256
-	partialData4 := (int64(d.cali.p8) * partialData3) / 32
-	partialData5 := (int64(d.cali.p7) * partialData1) * 16
-	partialData6 := (int64(d.cali.p6) * tlin) * 4194304
-	offset := (int64(d.cali.p5) * 140737488355328) + partialData4 + partialData5 + partialData6
-	partialData2 = (int64(d.cali.p4) * partialData3) / 32
-	partialData4 = (int64(d.cali.p3) * partialData1) * 4
-	partialData5 = (int64(d.cali.p2) - 16384) * tlin * 2097152
-	sensitivity := ((int64(d.cali.p1) - 16384) * 70368744177664) + partialData2 + partialData4 + partialData5
-	partialData1 = (sensitivity / 16777216) * rawPress
-	partialData2 = int64(d.cali.p10) * tlin
-	partialData3 = partialData2 + (65536 * int64(d.cali.p9))
-	partialData4 = (partialData3 * rawPress) / 8192
-
-	// dividing by 10 followed by multiplying by 10
-	// To avoid overflow caused by (pressure * partial_data4)
-	partialData5 = (rawPress * (partialData4 / 10)) / 512
-	partialData5 = partialData5 * 10
-	partialData6 = (int64)(uint64(rawPress) * uint64(rawPress))
-	partialData2 = (int64(d.cali.p11) * partialData6) / 65536
-	partialData3 = (partialData2 * rawPress) / 128
-	partialData4 = (offset / 4) + partialData1 + partialData5 + partialData3
-	compPress := ((uint64(partialData4) * 25) / uint64(1099511627776))
-	return int32(compPress), nil
-}
-
-// SoftReset commands the BMP388 to reset of all user configuration settings
-func (d *Device) SoftReset() error {
-	err := d.writeRegister(RegCmd, SoftReset)
-	if err != nil {
-		return errSoftReset
-	}
-	return nil
-}
-
-// Connected tries to reach the bmp388 and check its chip id register. Returns true if it was able to successfully
-// communicate over i2c and returns the correct value
-func (d *Device) Connected() bool {
-	data, err := d.readRegister(RegChipId, 1)
-	return err == nil && data[0] == ChipId // returns true if i2c comm was good and response equals 0x50
-}
-
-// SetMode changes the run mode of the sensor, NORMAL is the one to use for most cases. Use FORCED if you plan to take
-// measurements infrequently and want to conserve power. SLEEP will of course put the sensor to sleep
-func (d *Device) SetMode(mode Mode) error {
-	d.Config.Mode = mode
-	return d.writeRegister(RegPwrCtrl, PwrPress|PwrTemp|byte(d.Config.Mode))
-}
-
-func (d *Device) readSensorData(register byte) (data int64, err error) {
-
-	if !d.Connected() {
-		return 0, errNotConnected
-	}
-
-	// put the sensor back into forced mode to get a reading, the sensor goes back to sleep after taking one read in
-	// forced mode
-	if d.Config.Mode != Normal {
-		err = d.SetMode(Forced)
-		if err != nil {
-			return
-		}
-	}
-
-	bytes, err := d.readRegister(register, 3)
-	if err != nil {
-		return
-	}
-	data = int64(bytes[2])<<16 | int64(bytes[1])<<8 | int64(bytes[0])
-	return
-}
-
-// configurationError checks the register error for the configuration error bit. The bit is cleared on read by the bmp.
-func (d *Device) configurationError() bool {
-	data, err := d.readRegister(RegErr, 1)
-	return err == nil && (data[0]&0x04) != 0
-}
-
-func (d *Device) readRegister(register byte, len int) (data []byte, err error) {
-	data = make([]byte, len)
-	err = d.bus.ReadRegister(d.Address, register, data)
-	return
-}
-
-func (d *Device) writeRegister(register byte, data byte) error {
-	return d.bus.WriteRegister(d.Address, register, []byte{data})
-}
@@ -1,84 +0,0 @@
-// Package bmp388 provides a driver for Bosch's BMP388 digital temperature & pressure sensor.
-// The datasheet can be found here: https://www.bosch-sensortec.com/media/boschsensortec/downloads/datasheets/bst-bmp388-ds001.pdf
-package bmp388
-
-const Address byte = 0x77 // default I2C address
-
-const (
-	RegChipId  byte = 0x00 // useful for checking the connection
-	RegCali    byte = 0x31 // pressure & temperature compensation calibration coefficients
-	RegPress   byte = 0x04 // start of pressure data registers
-	RegTemp    byte = 0x07 // start of temperature data registers
-	RegPwrCtrl byte = 0x1B // measurement mode & pressure/temperature sensor power register
-	RegOSR     byte = 0x1C // oversampling settings register
-	RegODR     byte = 0x1D //
-	RegCmd     byte = 0x7E // miscellaneous command register
-	RegStat    byte = 0x03 // sensor status register
-	RegErr     byte = 0x02 // error status register
-	RegIIR     byte = 0x1F
-)
-
-const (
-	ChipId    byte = 0x50 // correct response if reading from chip id register
-	PwrPress  byte = 0x01 // power on pressure sensor
-	PwrTemp   byte = 0x02 // power on temperature sensor
-	SoftReset byte = 0xB6 // command to reset all user configuration
-	DRDYPress byte = 0x20 // for checking if pressure data is ready
-	DRDYTemp  byte = 0x40 // for checking if pressure data is ready
-)
-
-// The difference between forced and normal mode is the bmp388 goes to sleep after taking a measurement in forced mode.
-// Set it to forced if you intend to take measurements sporadically and want to save power. The driver will handle
-// waking the sensor up when the sensor is in forced mode.
-const (
-	Normal Mode = 0x30
-	Forced Mode = 0x16
-	Sleep  Mode = 0x00
-)
-
-// Increasing sampling rate increases precision but also the wait time for measurements. The datasheet has a table of
-// suggested values for oversampling, output data rates, and iir filter coefficients by use case.
-const (
-	Sampling1X Oversampling = iota
-	Sampling2X
-	Sampling4X
-	Sampling8X
-	Sampling16X
-	Sampling32X
-)
-
-// Output data rates in Hz. If increasing the sampling rates you need to decrease the output data rates, else the bmp388
-// will freeze and Configure() will return a configuration error message. In that case keep decreasing the data rate
-// until the bmp is happy
-const (
-	Odr200 OutputDataRate = iota
-	Odr100
-	Odr50
-	Odr25
-	Odr12p5
-	Odr6p25
-	Odr3p1
-	Odr1p5
-	Odr0p78
-	Odr0p39
-	Odr0p2
-	Odr0p1
-	Odr0p05
-	Odr0p02
-	Odr0p01
-	Odr0p006
-	Odr0p003
-	Odr0p0015
-)
-
-// IIR filter coefficients, higher values means steadier measurements but slower reaction times
-const (
-	Coeff0 FilterCoefficient = iota
-	Coeff1
-	Coeff3
-	Coeff7
-	Coeff15
-	Coeff31
-	Coeff63
-	Coeff127
-)
@@ -1,116 +0,0 @@
-// Package dht provides a driver for DHTXX family temperature and humidity sensors.
-//
-// [1] Datasheet DHT11: https://www.mouser.com/datasheet/2/758/DHT11-Technical-Data-Sheet-Translated-Version-1143054.pdf
-// [2] Datasheet DHT22: https://cdn-shop.adafruit.com/datasheets/Digital+humidity+and+temperature+sensor+AM2302.pdf
-// Adafruit C++ driver: https://github.com/adafruit/DHT-sensor-library
-
-package dht // import "tinygo.org/x/drivers/dht"
-
-import (
-	"encoding/binary"
-	"machine"
-	"time"
-)
-
-// enum type for device type
-type DeviceType uint8
-
-// DeviceType specific parsing of information received from the sensor
-func (d DeviceType) extractData(buf []byte) (temp int16, hum uint16) {
-	if d == DHT11 {
-		temp = int16(buf[2])
-		if buf[3]&0x80 > 0 {
-			temp = -1 - temp
-		}
-		temp *= 10
-		temp += int16(buf[3] & 0x0f)
-		hum = 10*uint16(buf[0]) + uint16(buf[1])
-	} else {
-		hum = binary.LittleEndian.Uint16(buf[0:2])
-		temp = int16(buf[3])<<8 + int16(buf[2]&0x7f)
-		if buf[2]&0x80 > 0 {
-			temp = -temp
-		}
-	}
-	return
-}
-
-// Celsius and Fahrenheit temperature scales
-type TemperatureScale uint8
-
-func (t TemperatureScale) convertToFloat(temp int16) float32 {
-	if t == C {
-		return float32(temp) / 10
-	} else {
-		// Fahrenheit
-		return float32(temp)*(9.0/50.) + 32.
-	}
-}
-
-// All functions return ErrorCode instance as error. This class can be used for more efficient error processing
-type ErrorCode uint8
-
-const (
-	startTimeout = time.Millisecond * 200
-	startingLow  = time.Millisecond * 20
-
-	DHT11 DeviceType = iota
-	DHT22
-
-	C TemperatureScale = iota
-	F
-
-	ChecksumError ErrorCode = iota
-	NoSignalError
-	NoDataError
-	UpdateError
-	UninitializedDataError
-)
-
-// error interface implementation for ErrorCode
-func (e ErrorCode) Error() string {
-	switch e {
-	case ChecksumError:
-		// DHT returns ChecksumError if all the data from the sensor was received, but the checksum does not match.
-		return "checksum mismatch"
-	case NoSignalError:
-		// DHT returns NoSignalError if there was no reply from the sensor. Check sensor connection or the correct pin
-		// sis chosen,
-		return "no signal"
-	case NoDataError:
-		// DHT returns NoDataError if the connection was successfully initialized, but not all 40 bits from
-		// the sensor is received
-		return "no data"
-	case UpdateError:
-		// DHT returns UpdateError if ReadMeasurements function is called before time specified in UpdatePolicy or
-		// less than 2 seconds after past measurement
-		return "cannot update now"
-	case UninitializedDataError:
-		// DHT returns UninitializedDataError if user attempts to access data before first measurement
-		return "no measurements done"
-	}
-	// should never be reached
-	return "unknown error"
-}
-
-// Update policy of the DHT device. UpdateTime cannot be shorter than 2 seconds. According to dht specification sensor
-// will return undefined data if update requested less than 2 seconds before last usage
-type UpdatePolicy struct {
-	UpdateTime          time.Duration
-	UpdateAutomatically bool
-}
-
-var (
-	// timeout counter equal to number of ticks per 1 millisecond
-	timeout counter
-)
-
-func init() {
-	timeout = cyclesPerMillisecond()
-}
-
-func cyclesPerMillisecond() counter {
-	freq := machine.CPUFrequency()
-	freq /= 1000
-	return counter(freq)
-}
@@ -1,6 +0,0 @@
-// +build mimxrt1062  stm32f405  atsamd51  stm32f103xx  k210  stm32f407
-
-package dht // import "tinygo.org/x/drivers/dht"
-
-// This file provides a definition of the counter for boards with frequency higher than 2^8 ticks per millisecond (>64MHz)
-type counter uint32
@@ -1,6 +0,0 @@
-// +build arduino atmega1284p nrf52840 digispark nrf52 arduino_nano nrf51 atsamd21 fe310 arduino_nano33 circuitplay_express arduino_mega2560
-
-package dht // import "tinygo.org/x/drivers/dht"
-
-// This file provides a definition of the counter for boards with frequency lower than 2^8 ticks per millisecond (<64MHz)
-type counter uint16
@@ -1,218 +0,0 @@
-// Package dht provides a driver for DHTXX family temperature and humidity sensors.
-//
-// [1] Datasheet DHT11: https://www.mouser.com/datasheet/2/758/DHT11-Technical-Data-Sheet-Translated-Version-1143054.pdf
-// [2] Datasheet DHT22: https://cdn-shop.adafruit.com/datasheets/Digital+humidity+and+temperature+sensor+AM2302.pdf
-// Adafruit C++ driver: https://github.com/adafruit/DHT-sensor-library
-
-package dht // import "tinygo.org/x/drivers/dht"
-
-import (
-	"machine"
-	"time"
-)
-
-// DummyDevice provides a basic interface for DHT devices.
-type DummyDevice interface {
-	ReadMeasurements() error
-	Measurements() (temperature int16, humidity uint16, err error)
-	Temperature() (int16, error)
-	TemperatureFloat(scale TemperatureScale) (float32, error)
-	Humidity() (uint16, error)
-	HumidityFloat() (float32, error)
-}
-
-// Basic implementation of the DummyDevice
-// This implementation takes measurements from sensor only with ReadMeasurements function
-// and does not provide a protection from too frequent calls for measurements.
-// Since taking measurements from the sensor is time consuming procedure and blocks interrupts,
-// user can avoid any hidden calls to the sensor.
-type device struct {
-	pin machine.Pin
-
-	measurements DeviceType
-	initialized  bool
-
-	temperature int16
-	humidity    uint16
-}
-
-// ReadMeasurements reads data from the sensor.
-// According to documentation pin should be always, but the t *device restores pin to the state before call.
-func (t *device) ReadMeasurements() error {
-	// initial waiting
-	state := powerUp(t.pin)
-	defer t.pin.Set(state)
-	err := t.read()
-	if err == nil {
-		t.initialized = true
-	}
-	return err
-}
-
-// Getter for temperature. Temperature method returns temperature as it is sent by device.
-// The temperature is measured temperature in Celsius multiplied by 10.
-// If no successful measurements for this device was performed, returns UninitializedDataError.
-func (t *device) Temperature() (int16, error) {
-	if !t.initialized {
-		return 0, UninitializedDataError
-	}
-	return t.temperature, nil
-}
-
-// Getter for temperature. TemperatureFloat returns temperature in a given scale.
-// If no successful measurements for this device was performed, returns UninitializedDataError.
-func (t *device) TemperatureFloat(scale TemperatureScale) (float32, error) {
-	if !t.initialized {
-		return 0, UninitializedDataError
-	}
-	return scale.convertToFloat(t.temperature), nil
-}
-
-// Getter for humidity. Humidity returns humidity as it is sent by device.
-// The humidity is measured in percentages multiplied by 10.
-// If no successful measurements for this device was performed, returns UninitializedDataError.
-func (t *device) Humidity() (uint16, error) {
-	if !t.initialized {
-		return 0, UninitializedDataError
-	}
-	return t.humidity, nil
-}
-
-// Getter for humidity. HumidityFloat returns humidity in percentages.
-// If no successful measurements for this device was performed, returns UninitializedDataError.
-func (t *device) HumidityFloat() (float32, error) {
-	if !t.initialized {
-		return 0, UninitializedDataError
-	}
-	return float32(t.humidity) / 10., nil
-}
-
-// Perform initialization of the communication protocol.
-// Device lowers the voltage on pin for startingLow=20ms and starts listening for response
-// Section 5.2 in [1]
-func initiateCommunication(p machine.Pin) {
-	// Send low signal to the device
-	p.Configure(machine.PinConfig{Mode: machine.PinOutput})
-	p.Low()
-	time.Sleep(startingLow)
-	// Set pin to high and wait for reply
-	p.High()
-	p.Configure(machine.PinConfig{Mode: machine.PinInput})
-}
-
-// Measurements returns both measurements: temperature and humidity as they sent by the device.
-// If no successful measurements for this device was performed, returns UninitializedDataError.
-func (t *device) Measurements() (temperature int16, humidity uint16, err error) {
-	if !t.initialized {
-		return 0, 0, UninitializedDataError
-	}
-	temperature = t.temperature
-	humidity = t.humidity
-	err = nil
-	return
-}
-
-// Main routine that performs communication with the sensor
-func (t *device) read() error {
-	// initialize loop variables
-
-	// buffer for the data sent by the sensor. Sensor sends 40 bits = 5 bytes
-	bufferData := [5]byte{}
-	buf := bufferData[:]
-
-	// We perform measurements of the signal from the sensor by counting low and high cycles.
-	// The bit is determined by the relative length of the high signal to low signal.
-	// For 1, high signal will be longer than low, for 0---low is longer.
-	// See section 5.3 [1]
-	signalsData := [80]counter{}
-	signals := signalsData[:]
-
-	// Start communication protocol with sensor
-	initiateCommunication(t.pin)
-	// Wait for sensor's response and abort if sensor does not reply
-	err := waitForDataTransmission(t.pin)
-	if err != nil {
-		return err
-	}
-	// count low and high cycles for sensor's reply
-	receiveSignals(t.pin, signals)
-
-	// process received signals and store the result in the buffer. Abort if data transmission was interrupted and not
-	// all 40 bits were received
-	err = t.extractData(signals[:], buf)
-	if err != nil {
-		return err
-	}
-	// Compute checksum and compare it to the one in data. Abort if checksum is incorrect
-	if !isValid(buf[:]) {
-		return ChecksumError
-	}
-
-	// Extract temperature and humidity data from buffer
-	t.temperature, t.humidity = t.measurements.extractData(buf)
-	return nil
-}
-
-// receiveSignals counts number of low and high cycles. The execution is time critical, so the function disables
-// interrupts
-func receiveSignals(pin machine.Pin, result []counter) {
-	i := uint8(0)
-	machine.UART1.Interrupt.Disable()
-	defer machine.UART1.Interrupt.Enable()
-	for ; i < 40; i++ {
-		result[i*2] = expectChange(pin, false)
-		result[i*2+1] = expectChange(pin, true)
-	}
-}
-
-// extractData process signal counters and transforms them into bits.
-// if any of the bits were not received (timed-out), returns NoDataError
-func (t *device) extractData(signals []counter, buf []uint8) error {
-	for i := uint8(0); i < 40; i++ {
-		lowCycle := signals[i*2]
-		highCycle := signals[i*2+1]
-		if lowCycle == timeout || highCycle == timeout {
-			return NoDataError
-		}
-		byteN := i >> 3
-		buf[byteN] <<= 1
-		if highCycle > lowCycle {
-			buf[byteN] |= 1
-		}
-	}
-	return nil
-}
-
-// waitForDataTransmission waits for reply from the sensor.
-// If no reply received, returns NoSignalError.
-// For more details, see section 5.2 in [1]
-func waitForDataTransmission(p machine.Pin) error {
-	// wait for thermometer to pull down
-	if expectChange(p, true) == timeout {
-		return NoSignalError
-	}
-	//wait for thermometer to pull up
-	if expectChange(p, false) == timeout {
-		return NoSignalError
-	}
-	// wait for thermometer to pull down and start sending the data
-	if expectChange(p, true) == timeout {
-		return NoSignalError
-	}
-	return nil
-}
-
-// Constructor function for a DummyDevice implementation.
-// This device provides full control to the user.
-// It does not do any hidden measurements calls and does not check
-// for 2 seconds delay between measurements.
-func NewDummyDevice(pin machine.Pin, deviceType DeviceType) DummyDevice {
-	pin.High()
-	return &device{
-		pin:          pin,
-		measurements: deviceType,
-		initialized:  false,
-		temperature:  0,
-		humidity:     0,
-	}
-}
@@ -1,154 +0,0 @@
-// Package dht provides a driver for DHTXX family temperature and humidity sensors.
-//
-// [1] Datasheet DHT11: https://www.mouser.com/datasheet/2/758/DHT11-Technical-Data-Sheet-Translated-Version-1143054.pdf
-// [2] Datasheet DHT22: https://cdn-shop.adafruit.com/datasheets/Digital+humidity+and+temperature+sensor+AM2302.pdf
-// Adafruit C++ driver: https://github.com/adafruit/DHT-sensor-library
-
-package dht // import "tinygo.org/x/drivers/dht"
-
-import (
-	"machine"
-	"time"
-)
-
-// Device interface provides main functionality of the DHTXX sensors.
-type Device interface {
-	DummyDevice
-	Configure(policy UpdatePolicy)
-}
-
-// managedDevice struct provides time control and optional automatic data retrieval from the sensor.
-// It delegates all the functionality to device
-type managedDevice struct {
-	t          device
-	lastUpdate time.Time
-	policy     UpdatePolicy
-}
-
-// Measurements returns both measurements: temperature and humidity as they sent by the device.
-// Depending on the UpdatePolicy of the device may update cached measurements.
-func (m *managedDevice) Measurements() (temperature int16, humidity uint16, err error) {
-	err = m.checkForUpdateOnDataRequest()
-	if err != nil {
-		return 0, 0, err
-	}
-	return m.t.Measurements()
-}
-
-// Getter for temperature. Temperature method returns temperature as it is sent by device.
-// The temperature is measured temperature in Celsius multiplied by 10.
-// Depending on the UpdatePolicy of the device may update cached measurements.
-func (m *managedDevice) Temperature() (temp int16, err error) {
-	err = m.checkForUpdateOnDataRequest()
-	if err != nil {
-		return 0, err
-	}
-	temp, err = m.t.Temperature()
-	return
-}
-
-func (m *managedDevice) checkForUpdateOnDataRequest() (err error) {
-	// update if necessary
-	if m.policy.UpdateAutomatically {
-		err = m.ReadMeasurements()
-	}
-	// ignore error if the data was updated recently
-	// interface comparison does not work in tinygo. Therefore need to cast to explicit type
-	if code, ok := err.(ErrorCode); ok && code == UpdateError {
-		err = nil
-	}
-	// add error if the data is not initialized
-	if !m.t.initialized {
-		err = UninitializedDataError
-	}
-	return err
-}
-
-// Getter for temperature. TemperatureFloat returns temperature in a given scale.
-// Depending on the UpdatePolicy of the device may update cached measurements.
-func (m *managedDevice) TemperatureFloat(scale TemperatureScale) (float32, error) {
-	err := m.checkForUpdateOnDataRequest()
-	if err != nil {
-		return 0, err
-	}
-	return m.t.TemperatureFloat(scale)
-}
-
-// Getter for humidity. Humidity returns humidity as it is sent by device.
-// The humidity is measured in percentages multiplied by 10.
-// Depending on the UpdatePolicy of the device may update cached measurements.
-func (m *managedDevice) Humidity() (hum uint16, err error) {
-	err = m.checkForUpdateOnDataRequest()
-	if err != nil {
-		return 0, err
-	}
-	return m.t.Humidity()
-}
-
-// Getter for humidity. HumidityFloat returns humidity in percentages.
-// Depending on the UpdatePolicy of the device may update cached measurements.
-func (m *managedDevice) HumidityFloat() (float32, error) {
-	err := m.checkForUpdateOnDataRequest()
-	if err != nil {
-		return 0, err
-	}
-	return m.t.HumidityFloat()
-}
-
-// ReadMeasurements reads data from the sensor.
-// The function will return UpdateError if it is called more frequently than specified in UpdatePolicy
-func (m *managedDevice) ReadMeasurements() (err error) {
-	timestamp := time.Now()
-	if !m.t.initialized || timestamp.Sub(m.lastUpdate) > m.policy.UpdateTime {
-		err = m.t.ReadMeasurements()
-	} else {
-		err = UpdateError
-	}
-	if err == nil {
-		m.lastUpdate = timestamp
-	}
-	return
-}
-
-// Configure configures UpdatePolicy for Device.
-// Configure checks for policy.UpdateTime and prevent from updating more frequently than specified in [1][2]
-// to prevent undefined behaviour of the sensor.
-func (m *managedDevice) Configure(policy UpdatePolicy) {
-	if policy.UpdateAutomatically && policy.UpdateTime < time.Second*2 {
-		policy.UpdateTime = time.Second * 2
-	}
-	m.policy = policy
-}
-
-// Constructor of the Device implementation.
-// This implementation updates data every 2 seconds during data access.
-func New(pin machine.Pin, deviceType DeviceType) Device {
-	pin.High()
-	return &managedDevice{
-		t: device{
-			pin:          pin,
-			measurements: deviceType,
-			initialized:  false,
-		},
-		lastUpdate: time.Time{},
-		policy: UpdatePolicy{
-			UpdateTime:          time.Second * 2,
-			UpdateAutomatically: true,
-		},
-	}
-}
-
-// Constructor of the Device implementation with given UpdatePolicy
-func NewWithPolicy(pin machine.Pin, deviceType DeviceType, updatePolicy UpdatePolicy) Device {
-	pin.High()
-	result := &managedDevice{
-		t: device{
-			pin:          pin,
-			measurements: deviceType,
-			initialized:  false,
-		},
-		lastUpdate: time.Time{},
-	}
-	result.Configure(updatePolicy)
-	return result
-}
@@ -1,34 +0,0 @@
-package dht // import "tinygo.org/x/drivers/dht"
-
-import (
-	"machine"
-	"time"
-)
-
-// Check if the pin is disabled
-func powerUp(p machine.Pin) bool {
-	state := p.Get()
-	if !state {
-		p.High()
-		time.Sleep(startTimeout)
-	}
-	return state
-}
-
-func expectChange(p machine.Pin, oldState bool) counter {
-	cnt := counter(0)
-	for ; p.Get() == oldState && cnt != timeout; cnt++ {
-	}
-	return cnt
-}
-
-func checksum(buf []uint8) uint8 {
-	return buf[4]
-}
-func computeChecksum(buf []uint8) uint8 {
-	return buf[0] + buf[1] + buf[2] + buf[3]
-}
-
-func isValid(buf []uint8) bool {
-	return checksum(buf) == computeChecksum(buf)
-}
@@ -20,17 +20,17 @@ package espat // import "tinygo.org/x/drivers/espat"

 import (
 	"errors"
+	"machine"
 	"strconv"
 	"strings"
 	"time"

-	"tinygo.org/x/drivers"
 	"tinygo.org/x/drivers/net"
 )

 // Device wraps UART connection to the ESP8266/ESP32.
 type Device struct {
-	bus drivers.UART
+	bus machine.UART

 	// command responses that come back from the ESP8266/ESP32
 	response []byte
@@ -43,7 +43,7 @@ type Device struct {
 var ActiveDevice *Device

 // New returns a new espat driver. Pass in a fully configured UART bus.
-func New(b drivers.UART) *Device {
+func New(b machine.UART) *Device {
 	return &Device{bus: b, response: make([]byte, 512), socketdata: make([]byte, 0, 1024)}
 }

@@ -9,7 +9,7 @@ import (
 )

 var (
-	i2c    = machine.I2C0
+	i2c    = &machine.I2C0
 	sensor = adt7410.New(i2c)
 )

@@ -1,55 +0,0 @@
-package main
-
-import (
-	"machine"
-	"time"
-
-	"tinygo.org/x/drivers/aht20"
-)
-
-func main() {
-	machine.I2C0.Configure(machine.I2CConfig{})
-
-	dev := aht20.New(machine.I2C0)
-	dev.Configure()
-
-	dev.Reset()
-	for {
-		time.Sleep(500 * time.Millisecond)
-
-		err := dev.Read()
-		if err != nil {
-			println("Error", err)
-			continue
-		}
-
-		println("temp    ", fmtD(dev.DeciCelsius(), 3, 1), "C")
-		println("humidity", fmtD(dev.DeciRelHumidity(), 3, 1), "%")
-	}
-}
-
-func fmtD(val int32, i int, f int) string {
-	result := make([]byte, i+f+1)
-	neg := false
-
-	if val < 0 {
-		val = -val
-		neg = true
-	}
-
-	for p := len(result) - 1; p >= 0; p-- {
-		result[p] = byte(int32('0') + (val % 10))
-		val = val / 10
-
-		if p == i+1 && p > 0 {
-			p--
-			result[p] = '.'
-		}
-	}
-
-	if neg {
-		result[0] = '-'
-	}
-
-	return string(result)
-}
@@ -13,9 +13,9 @@ import (
 )

 var (
-	apa *apa102.Device
+	apa apa102.Device

-	pwm   = machine.TCC0
+	led   = machine.PWM{machine.LED}
 	leds  = make([]color.RGBA, 1)
 	wheel = &Wheel{Brightness: 0x10}
 )
@@ -27,19 +27,12 @@ func init() {
 	apa = apa102.NewSoftwareSPI(machine.PA00, machine.PA01, 1)

 	// Configure the regular on-board LED for PWM fading
-	err := pwm.Configure(machine.PWMConfig{})
-	if err != nil {
-		println("failed to configure PWM")
-		return
-	}
+	machine.InitPWM()
+	led.Configure()
+
 }

 func main() {
-	channelLED, err := pwm.Channel(machine.LED)
-	if err != nil {
-		println("failed to configure LED PWM channel")
-		return
-	}

 	// We'll fade the on-board LED in a goroutine to show/ensure that the APA102
 	// works fine with the scheduler enabled.  Comment this out to test this code
@@ -50,11 +43,11 @@ func main() {
 				brightening = !brightening
 				continue
 			}
-			var brightness uint32 = uint32(i)
+			var brightness uint16 = uint16(i) << 8
 			if !brightening {
-				brightness = 256 - brightness
+				brightness = 0xFFFF - brightness
 			}
-			pwm.Set(channelLED, pwm.Top()*brightness/256)
+			led.Set(brightness)
 			time.Sleep(5 * time.Millisecond)
 		}
 	}()
@@ -1,53 +0,0 @@
-package main
-
-import (
-	"machine"
-	"strconv"
-	"time"
-
-	"tinygo.org/x/drivers/bmp388"
-)
-
-func main() {
-
-	machine.I2C0.Configure(machine.I2CConfig{})
-
-	sensor := bmp388.New(machine.I2C0)
-	if !sensor.Connected() {
-		println("Uh oh, BMP388 not detected")
-		return
-	}
-
-	// The accuracy of the sensor can be increased, at the cost of a slower output rate. Table 9 in Section 3.5 of the
-	// datasheet has recommended settings for common use cases. If increasing the sampling rate, the output data rate
-	// (ODR) will likely have to be decreased. Configure() will return an error if there's a problem with the
-	// configuration settings - keep decreasing the ODR and cycling the power to the sensor until it is happy.
-	err := sensor.Configure(bmp388.Config{
-		Pressure:    bmp388.Sampling8X,
-		Temperature: bmp388.Sampling2X,
-		ODR:         bmp388.Odr25,
-		IIR:         bmp388.Coeff0,
-		Mode:        bmp388.Normal,
-	})
-
-	// This is also fine
-	// err := sensor.Configure(bmp388.BMP388Config{})
-
-	if err != nil {
-		println(err)
-	}
-
-	for {
-		temp, err := sensor.ReadTemperature() // returns the temperature in centicelsius
-		press, err := sensor.ReadPressure()   // returns the pressure in centipascals
-
-		if err != nil {
-			println(err)
-		} else {
-			println("Temperature: " + strconv.FormatInt(int64(temp), 10) + " cC")
-			println("Pressure:    " + strconv.FormatInt(int64(press), 10) + " cPa\n")
-		}
-
-		time.Sleep(time.Second)
-	}
-}
@@ -1,23 +0,0 @@
-package main
-
-import (
-	"fmt"
-	"machine"
-	"time"
-	"tinygo.org/x/drivers/dht"
-)
-
-func main() {
-	pin := machine.D6
-	dhtSensor := dht.New(pin, dht.DHT11)
-	for {
-		temp, hum, err := dhtSensor.Measurements()
-		if err != nil {
-			fmt.Printf("Temperature: %02d.%d°C, Humidity: %02d.%d%%\n", temp/10, temp%10, hum/10, hum%10)
-		} else {
-			fmt.Printf("Could not take measurements from the sensor: %s\n", err.Error())
-		}
-		// Measurements cannot be updated only 2 seconds. More frequent calls will return the same value
-		time.Sleep(time.Second * 2)
-	}
-}
@@ -30,7 +30,7 @@ var (
 	tx   = machine.PA22
 	rx   = machine.PA23

-	console = machine.Serial
+	console = machine.UART0

 	adaptor *espat.Device
 )
@@ -36,7 +36,7 @@ var (
 	tx   = machine.PA22
 	rx   = machine.PA23

-	console = machine.Serial
+	console = machine.UART0

 	adaptor *espat.Device
 	topic   = "tinygo"
@@ -37,7 +37,7 @@ var (
 	tx   = machine.PA22
 	rx   = machine.PA23

-	console = machine.Serial
+	console = machine.UART0

 	adaptor *espat.Device
 	cl      mqtt.Client
@@ -20,7 +20,7 @@ var (
 	input [consoleBufLen]byte
 	store [storageBufLen]byte

-	console = machine.Serial
+	console = machine.UART0

 	dev *flash.Device

@@ -10,7 +10,7 @@ import (
 func main() {
 	println("GPS I2C Example")
 	machine.I2C0.Configure(machine.I2CConfig{})
-	ublox := gps.NewI2C(machine.I2C0)
+	ublox := gps.NewI2C(&machine.I2C0)
 	parser := gps.NewParser()
 	var fix gps.Fix
 	for {
@@ -10,7 +10,7 @@ import (
 func main() {
 	println("GPS UART Example")
 	machine.UART1.Configure(machine.UARTConfig{BaudRate: 9600})
-	ublox := gps.NewUART(machine.UART1)
+	ublox := gps.NewUART(&machine.UART1)
 	parser := gps.NewParser()
 	var fix gps.Fix
 	for {
@@ -1,4 +1,4 @@
-package main
+package hcsr04

 import (
 	"machine"
@@ -10,25 +10,6 @@ import (
 	"tinygo.org/x/drivers/ili9341"
 )

-const (
-	BALLWIDTH  = 136
-	BALLHEIGHT = 100
-)
-
-const (
-	SCREENHEIGHT = 240
-	SCREENWIDTH  = 320
-)
-
-const (
-	invBGCOLOR    = 0x75AD
-	invGRIDCOLOR  = 0x15A8
-	invBGSHADOW   = 0x8552
-	invGRIDSHADOW = 0x0C60
-	invRED        = 0x00F8
-	invWHITE      = 0xFFFF
-)
-
 const (
 	BGCOLOR    = 0xAD75
 	GRIDCOLOR  = 0xA815
@@ -44,12 +25,7 @@ const (
 )

 var (
-	dbg5 = machine.D5
-	dbg6 = machine.D6
-)
-
-var (
-	frameBuffer = [2][(BALLHEIGHT + 8) * (BALLWIDTH + 8)]uint16{}
+	frameBuffer = [(graphics.BALLHEIGHT + 8) * (graphics.BALLWIDTH + 8)]uint16{}

 	startTime int64
 	frame     int64
@@ -95,18 +71,14 @@ func main() {
 	balloldx = ballx
 	balloldy = bally // Prior ball position

-	var bufIdx int8 = 0
-
 	for {
-		dbg5.High()
-		bufIdx = 1 - bufIdx

 		balloldx = ballx // Save prior position
 		balloldy = bally
 		ballx += ballvx // Update position
 		bally += ballvy
 		ballvy += 0.06 // Update Y velocity
-		if (ballx <= 15) || (ballx >= SCREENWIDTH-BALLWIDTH) {
+		if (ballx <= 15) || (ballx >= graphics.SCREENWIDTH-graphics.BALLWIDTH) {
 			ballvx *= -1 // Left/right bounce
 		}
 		if bally >= YBOTTOM { // Hit ground?
@@ -128,13 +100,13 @@ func main() {
 		if int16(balloldy) < miny {
 			miny = int16(balloldy)
 		}
-		maxx = int16(ballx + BALLWIDTH - 1)
-		if int16(balloldx+BALLWIDTH-1) > maxx {
-			maxx = int16(balloldx + BALLWIDTH - 1)
+		maxx = int16(ballx + graphics.BALLWIDTH - 1)
+		if int16(balloldx+graphics.BALLWIDTH-1) > maxx {
+			maxx = int16(balloldx + graphics.BALLWIDTH - 1)
 		}
-		maxy = int16(bally + BALLHEIGHT - 1)
-		if int16(balloldy+BALLHEIGHT-1) > maxy {
-			maxy = int16(balloldy + BALLHEIGHT - 1)
+		maxy = int16(bally + graphics.BALLHEIGHT - 1)
+		if int16(balloldy+graphics.BALLHEIGHT-1) > maxy {
+			maxy = int16(balloldy + graphics.BALLHEIGHT - 1)
 		}

 		width = maxx - minx + 1
@@ -148,13 +120,13 @@ func main() {
 			ballframe -= 14
 		}

-		//// Set 7 palette entries to white, 7 to red, based on frame number.
-		//// This makes the ball spin
+		// Set 7 palette entries to white, 7 to red, based on frame number.
+		// This makes the ball spin
 		for i := 0; i < 14; i++ {
 			if (int(ballframe)+i)%14 < 7 {
-				palette[i+2] = invWHITE
+				palette[i+2] = WHITE
 			} else {
-				palette[i+2] = invRED
+				palette[i+2] = RED
 			} // Palette entries 0 and 1 aren't used (clear and shadow, respectively)
 		}

@@ -164,100 +136,61 @@ func main() {
 		by := miny - int16(bally) // Y relative to ball bitmap (can be negative)
 		bgx := minx               // X relative to background bitmap (>= 0)
 		bgy := miny               // Y relative to background bitmap (>= 0)
-		//var bufIdx int8 = 0
+		var bx1, bgx1 int16       // Loop counters and working vars
+		var p uint8               // 'packed' value of 2 ball pixels
+		var bufIdx int8 = 0

 		//tft.setAddrWindow(minx, miny, width, height)
-		//dbg5.Low()
-		dbg6.High()
-		//fmt.Printf("%d < %d < %d < %d\r\n", by, 0, BALLHEIGHT, height)

-		y := 0
-		if by < 0 {
-			max := -1 * int(by)
-			for y = 0; y < max; y++ { // For each row...
-				var bgidxBase = int(bgy)*(SCREENWIDTH) + int(bgx)
-				var yBase = y * int(width)
-				for x := 0; x < int(width); x++ {
-					frameBuffer[bufIdx][yBase+x] = graphics.Background[bgidxBase+x]
-				}
-				bgy++
-			}
-		}
-
-		y2 := y
-		max := 0
-		if bx < 0 {
-			max = -1 * int(bx)
-			bgy2 := bgy
-			for y = y2; y < y2+int(BALLHEIGHT); y++ { // For each row...
-				var bgidxBase = int(bgy2)*(SCREENWIDTH) + int(bgx)
-				var yBase = y * int(width)
-				//fmt.Printf("- %d %d %d %d %d %d\r\n", bgy, y, bgx, max, yBase, bgidxBase)
-				for x := 0; x < int(max); x++ {
-					//fmt.Printf("  %d %d\r\n", yBase+x, bgidxBase+x)
-					frameBuffer[bufIdx][yBase+x] = graphics.Background[bgidxBase+x]
-				}
-				bgy2++
-			}
-			//fmt.Printf("(%d, %d) - (%d, %d)\r\n", bx, 0, -1, BALLHEIGHT-1)
-		}
-
-		{
-			bgy2 := bgy
-			//fmt.Printf("(%d, %d) - (%d, %d)\r\n", 0, 0, BALLWIDTH-1, BALLHEIGHT-1)
-			for y = y2; y < y2+int(BALLHEIGHT); y++ { // For each row...
-				var bgidxBase = int(bgy2)*(SCREENWIDTH) + int(bgx)
-				var byBase = (y - y2) * BALLWIDTH
-				var yBase = y * int(width)
-				for x := max; x < int(BALLWIDTH)+max; x++ {
-					//fmt.Printf("%d %d %d %d\r\n", byBase, x, bgidxBase, yBase)
-					//time.Sleep(1 * time.Millisecond)
+		for y := 0; y < int(height); y++ { // For each row...
+			//destPtr = &renderbuf[bufIdx][0];
+			bx1 = bx   // Need to keep the original bx and bgx values,
+			bgx1 = bgx // so copies of them are made here (and changed in loop below)
+			for x := 0; x < int(width); x++ {
+				var bgidx = int(bgy)*(graphics.SCREENWIDTH/8) + int(bgx1/8)
+				if (bx1 >= 0) && (bx1 < graphics.BALLWIDTH) && // Is current pixel row/column
+					(by >= 0) && (by < graphics.BALLHEIGHT) { // inside the ball bitmap area?
 					// Yes, do ball compositing math...
-					c = uint16(graphics.Ball[int(byBase)+x-max]) // Get packed value (2 pixels)
-
+					p = graphics.Ball[int(by*(graphics.BALLWIDTH/2))+int(bx1/2)] // Get packed value (2 pixels)
+					if (bx1 & 1) != 0 {
+						c = uint16(p & 0xF)
+					} else {
+						c = uint16(p >> 4)
+					} // Unpack high or low nybble
 					if c == 0 { // Outside ball - just draw grid
-						c = graphics.Background[bgidxBase+x]
+						if graphics.Background[bgidx]&(0x80>>(bgx1&7)) != 0 {
+							c = GRIDCOLOR
+						} else {
+							c = BGCOLOR
+						}
 					} else if c > 1 { // In ball area...
 						c = palette[c]
 					} else { // In shadow area...
-						c = graphics.BackgroundShadow[bgidxBase+x]
+						if graphics.Background[bgidx]&(0x80>>(bgx1&7)) != 0 {
+							c = GRIDSHADOW
+						} else {
+							c = BGSHADOW
+						}
+					}
+				} else { // Outside ball bitmap, just draw background bitmap...
+					if graphics.Background[bgidx]&(0x80>>(bgx1&7)) != 0 {
+						c = GRIDCOLOR
+					} else {
+						c = BGCOLOR
 					}
-					frameBuffer[bufIdx][yBase+x] = c
 				}
-				bgy2++
+				frameBuffer[y*int(width)+x] = c
+				bx1++ // Increment bitmap position counters (X axis)
+				bgx1++
 			}
+			//tft.dmaWait(); // Wait for prior line to complete
+			//tft.writePixels(&renderbuf[bufIdx][0], width, false); // Non-blocking write
+			bufIdx = 1 - bufIdx
+			by++ // Increment bitmap position counters (Y axis)
+			bgy++
 		}

-		{
-			bgy2 := bgy
-			for y = y2; y < y2+int(BALLHEIGHT); y++ { // For each row...
-				var bgidxBase = int(bgy2)*(SCREENWIDTH) + int(bgx)
-				var yBase = y * int(width)
-				//fmt.Printf("+ %d %d %d %d %d\r\n", bgy, y, bgx, yBase, bgidxBase)
-				for x := int(BALLWIDTH) + max; x < int(width); x++ {
-					frameBuffer[bufIdx][yBase+x] = graphics.Background[bgidxBase+x]
-				}
-				bgy2++
-			}
-		}
-
-		y = y2 + int(BALLHEIGHT)
-		bgy += BALLHEIGHT
-		{
-			for ; y < int(height); y++ { // For each row...
-				//destPtr = &renderbuf[bufIdx][0];
-				var bgidxBase = int(bgy)*(SCREENWIDTH) + int(bgx)
-				var yBase = y * int(width)
-				for x := 0; x < int(width); x++ {
-					frameBuffer[bufIdx][yBase+x] = graphics.Background[bgidxBase+x]
-				}
-				bgy++
-			}
-		}
-		dbg6.Low()
-
-		display.DrawRGBBitmap(minx, miny, frameBuffer[bufIdx][:width*height], width, height)
-		//time.Sleep(10 * time.Millisecond)
+		display.DrawRGBBitmap(minx, miny, frameBuffer[:width*height], width, height)

 		// Show approximate frame rate
 		frame++
@@ -272,13 +205,21 @@ func main() {

 func DrawBackground() {
 	w, h := display.Size()
-	var bufIdx int8 = 0
-	for j := 0; j < int(h); j++ {
-		bufIdx = 1 - bufIdx
-		for k := 0; k < int(w); k++ {
-			frameBuffer[bufIdx][k] = graphics.Background[j*int(w)+k]
+	byteWidth := (w + 7) / 8 // Bitmap scanline pad = whole byte
+	var b uint8
+	for j := int16(0); j < h; j++ {
+		for k := int16(0); k < w; k++ {
+			if k&7 > 0 {
+				b <<= 1
+			} else {
+				b = graphics.Background[j*byteWidth+k/8]
+			}
+			if b&0x80 == 0 {
+				frameBuffer[k] = BGCOLOR
+			} else {
+				frameBuffer[k] = GRIDCOLOR
+			}
 		}
-		display.DrawRGBBitmap(0, int16(j), frameBuffer[bufIdx][0:w], w, 1)
-		time.Sleep(1 * time.Millisecond)
+		display.DrawRGBBitmap(0, j, frameBuffer[0:w], w, 1)
 	}
 }
@@ -1,63 +0,0 @@
-package main
-
-import (
-	"machine"
-	"time"
-
-	"tinygo.org/x/drivers/ina260"
-)
-
-func main() {
-	machine.I2C0.Configure(machine.I2CConfig{})
-
-	dev := ina260.New(machine.I2C0)
-	dev.Configure(ina260.Config{
-		AverageMode:     ina260.AVGMODE_16,
-		VoltConvTime:    ina260.CONVTIME_140USEC,
-		CurrentConvTime: ina260.CONVTIME_140USEC,
-		Mode:            ina260.MODE_CONTINUOUS | ina260.MODE_VOLTAGE | ina260.MODE_CURRENT,
-	})
-
-	if dev.Connected() {
-		println("INA260 detected")
-	} else {
-		println("INA260 NOT detected")
-		return
-	}
-
-	for {
-		microvolts := dev.Voltage()
-		microamps := dev.Current()
-		microwatts := dev.Power()
-
-		println(fmtD(microvolts, 4, 3), "mV,", fmtD(microamps, 4, 3), "mA,", fmtD(microwatts, 4, 3), "mW")
-
-		time.Sleep(10 * time.Millisecond)
-	}
-}
-
-func fmtD(val int32, i int, f int) string {
-	result := make([]byte, i+f+1)
-	neg := false
-
-	if val < 0 {
-		val = -val
-		neg = true
-	}
-
-	for p := len(result) - 1; p >= 0; p-- {
-		result[p] = byte(int32('0') + (val % 10))
-		val = val / 10
-
-		if p == i+1 && p > 0 {
-			p--
-			result[p] = '.'
-		}
-	}
-
-	if neg {
-		result[0] = '-'
-	}
-
-	return string(result)
-}
@@ -1,38 +0,0 @@
-package main
-
-import (
-	"machine"
-
-	"tinygo.org/x/drivers/keypad4x4"
-)
-
-func main() {
-	mapping := map[uint8]string{
-		1:  "1",
-		2:  "2",
-		3:  "3",
-		4:  "A",
-		5:  "4",
-		6:  "5",
-		7:  "6",
-		8:  "B",
-		9:  "7",
-		10: "8",
-		11: "9",
-		12: "C",
-		13: "*",
-		14: "0",
-		15: "#",
-		16: "D",
-	}
-
-	keypadDevice := keypad4x4.NewDevice(machine.D2, machine.D3, machine.D4, machine.D5, machine.D6, machine.D7, machine.D8, machine.D9)
-	keypadDevice.Configure()
-
-	for {
-		key := keypadDevice.GetKey()
-		if key != keypad4x4.NoKeyPressed {
-			println("Button: ", mapping[key])
-		}
-	}
-}
@@ -8,31 +8,19 @@ import (
 )

 const (
-	maxSpeed = 100
+	maxSpeed = 30000
 )

 func main() {
-	err := machine.TCC0.Configure(machine.PWMConfig{
-		Period: 16384e3, // 16.384ms
-	})
-	if err != nil {
-		println(err.Error())
-		return
-	}
+	machine.InitPWM()

-	spc, err := machine.TCC0.Channel(machine.D12)
-	if err != nil {
-		println(err.Error())
-		return
-	}
-
-	wheel := l293x.NewWithSpeed(machine.D10, machine.D11, spc, machine.TCC0)
+	wheel := l293x.NewWithSpeed(machine.D10, machine.D11, machine.PWM{machine.D12})
 	wheel.Configure()

 	for i := 0; i <= 10; i++ {
 		println("Forward")
-		var i uint32
-		for i = 0; i < maxSpeed; i += 10 {
+		var i uint16
+		for i = 0; i < maxSpeed; i += 1000 {
 			wheel.Forward(i)
 			time.Sleep(time.Millisecond * 100)
 		}
@@ -42,7 +30,7 @@ func main() {
 		time.Sleep(time.Millisecond * 1000)

 		println("Backward")
-		for i = 0; i < maxSpeed; i += 10 {
+		for i = 0; i < maxSpeed; i += 1000 {
 			wheel.Backward(i)
 			time.Sleep(time.Millisecond * 100)
 		}
@@ -8,38 +8,19 @@ import (
 )

 const (
-	maxSpeed = 100
+	maxSpeed = 30000
 )

 func main() {
-	machine.D11.Configure(machine.PinConfig{Mode: machine.PinOutput})
-	machine.D12.Configure(machine.PinConfig{Mode: machine.PinOutput})
+	machine.InitPWM()

-	err := machine.TCC0.Configure(machine.PWMConfig{})
-	if err != nil {
-		println(err.Error())
-		return
-	}
-
-	ca, err := machine.TCC0.Channel(machine.D11)
-	if err != nil {
-		println(err.Error())
-		return
-	}
-
-	cb, err := machine.TCC0.Channel(machine.D12)
-	if err != nil {
-		println(err.Error())
-		return
-	}
-
-	wheel := l9110x.NewWithSpeed(ca, cb, machine.TCC0)
+	wheel := l9110x.NewWithSpeed(machine.PWM{machine.D11}, machine.PWM{machine.D12})
 	wheel.Configure()

 	for i := 0; i <= 10; i++ {
 		println("Forward")
-		var i uint32
-		for i = 0; i < maxSpeed; i += 10 {
+		var i uint16
+		for i = 0; i < maxSpeed; i += 1000 {
 			wheel.Forward(i)
 			time.Sleep(time.Millisecond * 100)
 		}
@@ -49,7 +30,7 @@ func main() {
 		time.Sleep(time.Millisecond * 1000)

 		println("Backward")
-		for i = 0; i < maxSpeed; i += 10 {
+		for i = 0; i < maxSpeed; i += 1000 {
 			wheel.Backward(i)
 			time.Sleep(time.Millisecond * 100)
 		}
@@ -1,135 +0,0 @@
-package main
-
-import (
-	"machine"
-	"time"
-
-	"tinygo.org/x/drivers/max72xx"
-)
-
-// example for a 4 digit 7 segment display
-func main() {
-	// Pins for Arduino Nano 33 IOT
-	err := machine.SPI0.Configure(machine.SPIConfig{
-		SDO:       machine.D11, // default SDO pin
-		SCK:       machine.D13, // default sck pin
-		LSBFirst:  false,
-		Frequency: 10000000,
-	})
-
-	if err != nil {
-		println(err.Error())
-	}
-
-	driver := max72xx.NewDevice(machine.SPI0, machine.D6)
-	driver.Configure()
-
-	digitNumber := 4
-
-	driver.StopDisplayTest()
-	driver.SetDecodeMode(4)
-	driver.SetScanLimit(4)
-	driver.StopShutdownMode()
-
-	for i := 1; i < int(digitNumber); i++ {
-		driver.WriteCommand(byte(i), byte(Blank))
-	}
-
-	for {
-		for _, character := range characters {
-			println("writing", "characterValue:", character.String())
-			driver.WriteCommand(byte(4), byte(character))
-			driver.WriteCommand(byte(3), byte(character))
-			driver.WriteCommand(byte(2), byte(character))
-			driver.WriteCommand(byte(1), byte(character))
-			time.Sleep(500 * time.Millisecond)
-
-		}
-		time.Sleep(time.Second)
-	}
-
-}
-
-var characters = []Character{
-	Zero,
-	One,
-	Two,
-	Three,
-	Four,
-	Five,
-	Six,
-	Seven,
-	Eight,
-	Nine,
-	Dash,
-	E,
-	H,
-	L,
-	P,
-	Blank,
-	Dot,
-}
-
-// Each bit translates to a pin, which is driven high or low
-type Character byte
-
-func (char Character) String() string {
-	switch char {
-	case Zero:
-		return "0"
-	case One:
-		return "1"
-	case Two:
-		return "2"
-	case Three:
-		return "3"
-	case Four:
-		return "4"
-	case Five:
-		return "5"
-	case Six:
-		return "6"
-	case Seven:
-		return "7"
-	case Eight:
-		return "8"
-	case Nine:
-		return "9"
-	case Dash:
-		return "-"
-	case E:
-		return "E"
-	case H:
-		return "H"
-	case L:
-		return "L"
-	case P:
-		return "P"
-	case Blank:
-		return ""
-	case Dot:
-		return "."
-	}
-
-	return ""
-}
-
-const (
-	Zero  Character = 0 //126
-	One   Character = 1 //48
-	Two   Character = 2 // 109
-	Three Character = 3 // 121
-	Four  Character = 4
-	Five  Character = 5
-	Six   Character = 6
-	Seven Character = 7
-	Eight Character = 8
-	Nine  Character = 9
-	Dash  Character = 10
-	E     Character = 11
-	H     Character = 12
-	L     Character = 13
-	P     Character = 14
-	Blank Character = 15
-	Dot   Character = 128
-)
@@ -1,45 +0,0 @@
-// This example demonstrates putting several mcp23017 devices together into
-// a single virtual I/O array.
-package main
-
-import (
-	"machine"
-
-	"tinygo.org/x/drivers/mcp23017"
-)
-
-func main() {
-	err := machine.I2C0.Configure(machine.I2CConfig{
-		Frequency: machine.TWI_FREQ_400KHZ,
-	})
-	if err != nil {
-		panic(err)
-	}
-	// Assume the devices are at addresses 0x20, 0x21
-	dev, err := mcp23017.NewI2CDevices(machine.I2C0, 0x20, 0x21)
-	if err != nil {
-		panic(err)
-	}
-	// Configure pin 0 for input and all the others for output.
-	if err := dev.SetModes([]mcp23017.PinMode{
-		mcp23017.Input | mcp23017.Pullup,
-		mcp23017.Output,
-	}); err != nil {
-		panic(err)
-	}
-	input := dev.Pin(0)
-	// Make a mask that represents all the output pins.
-	// Note that this leverages the driver behaviour which replicates the highest bit in
-	// the last slice element (1 in this case) to all other pins
-	outputMask := mcp23017.PinSlice{^mcp23017.Pins(1 << 0)} // All except pin 0
-	inputVal, err := input.Get()
-	if err != nil {
-		panic(err)
-	}
-	println("input value: ", inputVal)
-	// Set the values of all the output pins.
-	err = dev.SetPins(mcp23017.PinSlice{0b1011011_01101110, 0b11111101_11100110}, outputMask)
-	if err != nil {
-		panic(err)
-	}
-}
@@ -1,39 +0,0 @@
-package main
-
-import (
-	"machine"
-
-	"tinygo.org/x/drivers/mcp23017"
-)
-
-func main() {
-	err := machine.I2C0.Configure(machine.I2CConfig{
-		Frequency: machine.TWI_FREQ_400KHZ,
-	})
-	if err != nil {
-		panic(err)
-	}
-	dev, err := mcp23017.NewI2C(machine.I2C0, 0x20)
-	if err != nil {
-		panic(err)
-	}
-	// Configure pin 0 for input and all the others for output.
-	if err := dev.SetModes([]mcp23017.PinMode{
-		mcp23017.Input | mcp23017.Pullup,
-		mcp23017.Output,
-	}); err != nil {
-		panic(err)
-	}
-	input := dev.Pin(0)
-	outputMask := ^mcp23017.Pins(1 << 0) // All except pin 0
-	inputVal, err := input.Get()
-	if err != nil {
-		panic(err)
-	}
-	println("input value: ", inputVal)
-	// Set the values of all the output pins.
-	err = dev.SetPins(0b1011011_01101110, outputMask)
-	if err != nil {
-		panic(err)
-	}
-}
@@ -1,55 +0,0 @@
-package main
-
-import (
-	"fmt"
-	"machine"
-	"time"
-
-	"tinygo.org/x/drivers/mcp2515"
-)
-
-var (
-	spi   = machine.SPI0
-	csPin = machine.D5
-)
-
-func main() {
-	spi.Configure(machine.SPIConfig{
-		Frequency: 115200,
-		SCK:       machine.SPI0_SCK_PIN,
-		SDO:       machine.SPI0_SDO_PIN,
-		SDI:       machine.SPI0_SDI_PIN,
-		Mode:      0})
-	can := mcp2515.New(spi, csPin)
-	can.Configure()
-	err := can.Begin(mcp2515.CAN500kBps, mcp2515.Clock8MHz)
-	if err != nil {
-		failMessage(err.Error())
-	}
-
-	for {
-		err := can.Tx(0x111, 8, []byte{0x00, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA})
-		if err != nil {
-			failMessage(err.Error())
-		}
-		if can.Received() {
-			msg, err := can.Rx()
-			if err != nil {
-				failMessage(err.Error())
-			}
-			fmt.Printf("CAN-ID: %03X dlc: %d data: ", msg.ID, msg.Dlc)
-			for _, b := range msg.Data {
-				fmt.Printf("%02X ", b)
-			}
-			fmt.Print("\r\n")
-		}
-		time.Sleep(time.Millisecond * 500)
-	}
-}
-
-func failMessage(msg string) {
-	for {
-		println(msg)
-		time.Sleep(1 * time.Second)
-	}
-}
@@ -1,74 +0,0 @@
-package main
-
-import (
-	"fmt"
-	"machine"
-	"time"
-
-	"tinygo.org/x/drivers/p1am"
-)
-
-func main() {
-	for {
-		if err := loop(); err != nil {
-			fmt.Printf("loop failed, retrying: %v\n", err)
-			time.Sleep(500 * time.Millisecond)
-		}
-	}
-}
-func loop() error {
-	led := machine.LED
-	led.Configure(machine.PinConfig{Mode: machine.PinOutput})
-	sw := machine.SWITCH
-	sw.Configure(machine.PinConfig{Mode: machine.PinInput})
-
-	if err := p1am.Controller.Initialize(); err != nil {
-		return fmt.Errorf("initializing controller: %w", err)
-	}
-
-	version, err := p1am.Controller.Version()
-	if err != nil {
-		return fmt.Errorf("fetching base controller version: %w", err)
-	}
-	fmt.Printf("Base controller version: %d.%d.%d\n", version[0], version[1], version[2])
-
-	for i := 1; i <= p1am.Controller.Slots; i++ {
-		slot := p1am.Controller.Slot(i)
-		fmt.Printf("Slot %d: ID 0x%08x, Props %+v\n", i, slot.ID, slot.Props)
-	}
-
-	slot1 := p1am.Controller.Slot(1)
-	var lastInput uint32
-	state := sw.Get()
-	for {
-		if active, err := p1am.Controller.Active(); err != nil || !active {
-			return fmt.Errorf("controller active %v: %v", active, err)
-		}
-		if state != sw.Get() {
-			state = sw.Get()
-			fmt.Printf("New switch state: %v\n", state)
-			if slot1.Props.DO > 0 {
-				if err := slot1.Channel(1).WriteDiscrete(state); err != nil {
-					return err
-				}
-			}
-		}
-		if slot1.Props.DI > 0 {
-			sstate, err := slot1.ReadDiscrete()
-			if err != nil {
-				return fmt.Errorf("reading slot: %w", err)
-			}
-			if sstate != lastInput {
-				lastInput = sstate
-				fmt.Printf("new DI state: %#b\n", sstate)
-			}
-		}
-		if state {
-			led.High()
-		} else {
-			led.Low()
-		}
-		time.Sleep(time.Millisecond * 10)
-	}
-	return nil
-}
@@ -1,45 +0,0 @@
-package main
-
-import (
-	"fmt"
-	"machine"
-	"time"
-
-	"tinygo.org/x/drivers/pcf8563"
-)
-
-var (
-	i2c = machine.I2C0
-	rtc = pcf8563.New(i2c)
-)
-
-func main() {
-	i2c.Configure(machine.I2CConfig{Frequency: machine.TWI_FREQ_400KHZ})
-	rtc.Reset()
-
-	time.Sleep(3 * time.Second)
-	rtc.SetTime(time.Date(2006, 1, 2, 15, 4, 50, 0, time.UTC))
-
-	rtc.SetAlarm(time.Date(2006, 1, 2, 15, 5, 0, 0, time.UTC))
-	rtc.EnableAlarmInterrupt()
-
-	prev := -1
-
-	for {
-		for {
-			t, _ := rtc.ReadTime()
-			if prev != t.Second() {
-				fmt.Printf("%s\r\n", t.String())
-				prev = t.Second()
-
-				if rtc.AlarmTriggered() {
-					fmt.Printf("alarm triggered\r\n")
-					rtc.ClearAlarm()
-				}
-
-				break
-			}
-			time.Sleep(time.Millisecond * 100)
-		}
-	}
-}
@@ -1,31 +0,0 @@
-package main
-
-import (
-	"machine"
-	"time"
-
-	"tinygo.org/x/drivers/pcf8563"
-)
-
-var (
-	i2c = machine.I2C0
-	rtc = pcf8563.New(i2c)
-)
-
-func main() {
-	i2c.Configure(machine.I2CConfig{Frequency: machine.TWI_FREQ_400KHZ})
-	rtc.Reset()
-
-	for {
-		rtc.SetOscillatorFrequency(pcf8563.RTC_COT_1HZ)
-		time.Sleep(3 * time.Second)
-		rtc.SetOscillatorFrequency(pcf8563.RTC_COT_32HZ)
-		time.Sleep(3 * time.Second)
-		rtc.SetOscillatorFrequency(pcf8563.RTC_COT_1KHZ)
-		time.Sleep(3 * time.Second)
-		rtc.SetOscillatorFrequency(pcf8563.RTC_COT_32KHZ)
-		time.Sleep(3 * time.Second)
-		rtc.SetOscillatorFrequency(pcf8563.RTC_COT_DISABLE)
-		time.Sleep(3 * time.Second)
-	}
-}
@@ -1,36 +0,0 @@
-package main
-
-import (
-	"fmt"
-	"machine"
-	"time"
-
-	"tinygo.org/x/drivers/pcf8563"
-)
-
-var (
-	i2c = machine.I2C0
-	rtc = pcf8563.New(i2c)
-)
-
-func main() {
-	i2c.Configure(machine.I2CConfig{Frequency: machine.TWI_FREQ_400KHZ})
-	rtc.Reset()
-
-	rtc.SetTime(time.Date(2006, 1, 2, 15, 4, 5, 0, time.UTC))
-
-	prev := -1
-
-	for {
-		for {
-			t, _ := rtc.ReadTime()
-			if prev != t.Second() {
-				fmt.Printf("%s\r\n", t.String())
-				prev = t.Second()
-				break
-			}
-			time.Sleep(time.Millisecond * 100)
-		}
-	}
-
-}
@@ -1,46 +0,0 @@
-package main
-
-import (
-	"fmt"
-	"machine"
-	"time"
-
-	"tinygo.org/x/drivers/pcf8563"
-)
-
-var (
-	i2c = machine.I2C0
-	rtc = pcf8563.New(i2c)
-)
-
-func main() {
-	i2c.Configure(machine.I2CConfig{Frequency: machine.TWI_FREQ_400KHZ})
-	rtc.Reset()
-
-	time.Sleep(3 * time.Second)
-	rtc.SetTime(time.Date(2006, 1, 2, 15, 4, 5, 0, time.UTC))
-
-	rtc.SetTimer(15 * time.Second)
-	rtc.EnableTimerInterrupt()
-
-	prev := -1
-
-	for {
-		for {
-			t, _ := rtc.ReadTime()
-			if prev != t.Second() {
-				fmt.Printf("%s\r\n", t.String())
-				prev = t.Second()
-
-				if rtc.TimerTriggered() {
-					fmt.Printf("timer triggered\r\n")
-					rtc.ClearTimer()
-					rtc.SetTimer(10 * time.Second)
-				}
-
-				break
-			}
-			time.Sleep(time.Millisecond * 100)
-		}
-	}
-}
@@ -1,363 +0,0 @@
-package main
-
-import (
-	"fmt"
-	"io"
-	"machine"
-	"os"
-	"strconv"
-	"strings"
-	"time"
-
-	"tinygo.org/x/drivers/sdcard"
-)
-
-const consoleBufLen = 64
-const storageBufLen = 1024
-
-var (
-	debug = false
-
-	input [consoleBufLen]byte
-	store [storageBufLen]byte
-
-	console = machine.Serial
-
-	dev *sdcard.Device
-
-	commands map[string]cmdfunc = map[string]cmdfunc{
-		"":      cmdfunc(noop),
-		"help":  cmdfunc(help),
-		"dbg":   cmdfunc(dbg),
-		"erase": cmdfunc(erase),
-		"lsblk": cmdfunc(lsblk),
-		"write": cmdfunc(write),
-		"xxd":   cmdfunc(xxd),
-	}
-
-	his history
-)
-
-type history struct {
-	buf [32]string
-	wp  int
-	idx int
-}
-
-func (h *history) Add(cmd string) {
-	if len(cmd) == 0 {
-		h.idx = h.wp
-		return
-	}
-
-	if h.wp == len(h.buf)-1 {
-		for i := 1; i < len(h.buf); i++ {
-			h.buf[i-1] = h.buf[i]
-		}
-		h.wp--
-	}
-
-	h.buf[h.wp] = cmd
-	h.wp++
-	h.idx = h.wp
-}
-
-func (h *history) PeekPrev() string {
-	if h.idx > 0 {
-		h.idx--
-	}
-	return h.buf[h.idx]
-}
-
-func (h *history) PeekNext() string {
-	if h.idx < h.wp {
-		h.idx++
-	}
-	return h.buf[h.idx]
-}
-
-type cmdfunc func(argv []string)
-
-const (
-	StateInput = iota
-	StateEscape
-	StateEscBrc
-	StateCSI
-)
-
-func RunFor(device *sdcard.Device) {
-
-	dev = device
-
-	prompt()
-
-	var state = StateInput
-
-	for i := 0; ; {
-		if console.Buffered() > 0 {
-			data, _ := console.ReadByte()
-			if debug {
-				fmt.Printf("\rdata: %x, his.idx: %d\r\n\r", data, his.idx)
-				prompt()
-				console.Write(input[:i])
-			}
-			switch state {
-			case StateInput:
-				switch data {
-				case 0x8:
-					fallthrough
-				case 0x7f: // this is probably wrong... works on my machine tho :)
-					// backspace
-					if i > 0 {
-						i -= 1
-						console.Write([]byte{0x8, 0x20, 0x8})
-					}
-				case 13:
-					// return key
-					console.Write([]byte("\r\n"))
-					runCommand(string(input[:i]))
-					his.Add(string(input[:i]))
-					prompt()
-
-					i = 0
-					continue
-				case 27:
-					// escape
-					state = StateEscape
-				default:
-					// anything else, just echo the character if it is printable
-					if strconv.IsPrint(rune(data)) {
-						if i < (consoleBufLen - 1) {
-							console.WriteByte(data)
-							input[i] = data
-							i++
-						}
-					}
-				}
-			case StateEscape:
-				switch data {
-				case 0x5b:
-					state = StateEscBrc
-				default:
-					state = StateInput
-				}
-			case StateEscBrc:
-				switch data {
-				case 0x41:
-					// up
-					println()
-					prompt()
-					cmd := his.PeekPrev()
-					i = len(cmd)
-					copy(input[:i], []byte(cmd))
-					console.Write(input[:i])
-					state = StateInput
-				case 0x42:
-					//down
-					println()
-					prompt()
-					cmd := his.PeekNext()
-					i = len(cmd)
-					copy(input[:i], []byte(cmd))
-					console.Write(input[:i])
-					state = StateInput
-				default:
-					// TODO: handle escape sequences
-					state = StateInput
-				}
-			default:
-				// TODO: handle escape sequences
-				state = StateInput
-			}
-		} else {
-			time.Sleep(1 * time.Millisecond)
-		}
-	}
-}
-
-func runCommand(line string) {
-	argv := strings.SplitN(strings.TrimSpace(line), " ", -1)
-	cmd := argv[0]
-
-	cmdfn, ok := commands[cmd]
-	if !ok {
-		println("unknown command: " + line)
-		return
-	}
-	cmdfn(argv)
-}
-
-func noop(argv []string) {}
-
-func help(argv []string) {
-	fmt.Printf("help\r\n")
-	fmt.Printf("dbg\r\n")
-	fmt.Printf("erase\r\n")
-	fmt.Printf("lsblk\r\n")
-	fmt.Printf("write <hex offset> <bytes>\r\n")
-	fmt.Printf("xxd <start address> <length>\r\n")
-}
-
-func dbg(argv []string) {
-	if debug {
-		debug = false
-		println("Console debbuging off")
-	} else {
-		debug = true
-		println("Console debbuging on")
-	}
-}
-
-func lsblk(argv []string) {
-	csd := dev.CSD
-	sectors, err := csd.Sectors()
-	if err != nil {
-		fmt.Printf("%s\r\n", err.Error())
-		return
-	}
-	cid := dev.CID
-
-	fmt.Printf(
-		"\r\n-------------------------------------\r\n"+
-			" Device Information:  \r\n"+
-			"-------------------------------------\r\n"+
-			" JEDEC ID: %v\r\n"+
-			" Serial:   %v\r\n"+
-			" Status 1: %02x\r\n"+
-			" Status 2: %02x\r\n"+
-			" \r\n"+
-			" Max clock speed (MHz): %d\r\n"+
-			" Has Sector Protection: %t\r\n"+
-			" Supports Fast Reads:   %t\r\n"+
-			" Supports QSPI Reads:   %t\r\n"+
-			" Supports QSPI Write:   %t\r\n"+
-			" Write Status Split:    %t\r\n"+
-			" Single Status Byte:    %t\r\n"+
-			"-Sectors:               %d\r\n"+
-			"-Bytes (Sectors * 512)  %d\r\n"+
-			"-ManufacturerID         %02X\r\n"+
-			"-OEMApplicationID       %04X\r\n"+
-			"-ProductName            %s\r\n"+
-			"-ProductVersion         %s\r\n"+
-			"-ProductSerialNumber    %08X\r\n"+
-			"-ManufacturingYear      %02X\r\n"+
-			"-ManufacturingMonth     %02X\r\n"+
-			"-Always1                %d\r\n"+
-			"-CRC                    %02X\r\n"+
-			"-------------------------------------\r\n\r\n",
-		"attrs.JedecID",         // attrs.JedecID,
-		cid.ProductSerialNumber, // serialNumber1,
-		0,                       // status1,
-		0,                       // status2,
-		csd.TRAN_SPEED,          // attrs.MaxClockSpeedMHz,
-		false,                   // attrs.HasSectorProtection,
-		false,                   // attrs.SupportsFastRead,
-		false,                   // attrs.SupportsQSPI,
-		false,                   // attrs.SupportsQSPIWrites,
-		false,                   // attrs.WriteStatusSplit,
-		false,                   // attrs.SingleStatusByte,
-		sectors,
-		csd.Size(),
-		cid.ManufacturerID,
-		cid.OEMApplicationID,
-		cid.ProductName,
-		cid.ProductVersion,
-		cid.ProductSerialNumber,
-		cid.ManufacturingYear,
-		cid.ManufacturingMonth,
-		cid.Always1,
-		cid.CRC,
-	)
-}
-
-func erase(argv []string) {
-	fmt.Printf("erase - not impl\r\n")
-}
-
-var writeBuf [256]byte
-
-func write(argv []string) {
-	if len(argv) < 3 {
-		println("usage: write <hex offset> <bytes>")
-		return
-	}
-	var err error
-	var addr uint64 = 0x0
-	if addr, err = strconv.ParseUint(argv[1], 16, 32); err != nil {
-		println("Invalid address: " + err.Error() + "\r\n")
-		return
-	}
-	buf := writeBuf[:0]
-	for i := 0; i < len(argv[2]); i += 2 {
-		var b uint64
-		if b, err = strconv.ParseUint(argv[2][i:i+2], 16, 8); err != nil {
-			println("Invalid bytes: " + err.Error() + "\r\n")
-			return
-		}
-		buf = append(buf, byte(b))
-	}
-
-	if _, err = dev.WriteAt(buf, int64(addr)); err != nil {
-		println("Write error: " + err.Error() + "\r\n")
-	}
-}
-
-func xxd(argv []string) {
-	var err error
-	var addr uint64 = 0x0
-	var size int = 64
-	switch len(argv) {
-	case 3:
-		if size, err = strconv.Atoi(argv[2]); err != nil {
-			println("Invalid size argument: " + err.Error() + "\r\n")
-			return
-		}
-		if size > storageBufLen || size < 1 {
-			fmt.Printf("Size of hexdump must be greater than 0 and less than %d\r\n", storageBufLen)
-			return
-		}
-		fallthrough
-	case 2:
-		if addr, err = strconv.ParseUint(argv[1], 16, 32); err != nil {
-			println("Invalid address: " + err.Error() + "\r\n")
-			return
-		}
-		fallthrough
-	case 1:
-		// no args supplied, so nothing to do here, just use the defaults
-	default:
-		println("usage: xxd <hex address, ex: 0xA0> <size of hexdump in bytes>\r\n")
-		return
-	}
-	buf := store[0:size]
-	_, err = dev.ReadAt(buf, int64(addr))
-	if err != nil {
-		fmt.Printf("xxd err : %s\r\n", err.Error())
-	}
-	xxdfprint(os.Stdout, uint32(addr), buf)
-}
-
-func xxdfprint(w io.Writer, offset uint32, b []byte) {
-	var l int
-	var buf16 = make([]byte, 16)
-	for i, c := 0, len(b); i < c; i += 16 {
-		l = i + 16
-		if l >= c {
-			l = c
-		}
-		fmt.Fprintf(w, "%08x: % x    ", offset+uint32(i), b[i:l])
-		for j, n := 0, l-i; j < 16; j++ {
-			if j >= n || !strconv.IsPrint(rune(b[i+j])) || b[i+j] >= 0x80 {
-				buf16[j] = '.'
-			} else {
-				buf16[j] = b[i+j]
-			}
-		}
-		console.Write(buf16)
-		println()
-	}
-}
-
-func prompt() {
-	print("==> ")
-}
@@ -1,17 +0,0 @@
-// +build feather_m4 feather_m4_can feather_nrf52840
-
-package main
-
-import (
-	"machine"
-)
-
-func init() {
-	spi = machine.SPI0
-	sckPin = machine.SPI0_SCK_PIN
-	sdoPin = machine.SPI0_SDO_PIN
-	sdiPin = machine.SPI0_SDI_PIN
-	csPin = machine.D10
-
-	ledPin = machine.LED
-}
@@ -1,17 +0,0 @@
-// +build grandcentral-m4
-
-package main
-
-import (
-	"machine"
-)
-
-func init() {
-	spi = machine.SPI1
-	sckPin = machine.SDCARD_SCK_PIN
-	sdoPin = machine.SDCARD_SDO_PIN
-	sdiPin = machine.SDCARD_SDI_PIN
-	csPin = machine.SDCARD_CS_PIN
-
-	ledPin = machine.LED
-}
@@ -1,17 +0,0 @@
-// +build atsamd21,!p1am_100
-
-package main
-
-import (
-	"machine"
-)
-
-func init() {
-	spi = machine.SPI0
-	sckPin = machine.SPI0_SCK_PIN
-	sdoPin = machine.SPI0_SDO_PIN
-	sdiPin = machine.SPI0_SDI_PIN
-	csPin = machine.D2
-
-	ledPin = machine.LED
-}
@@ -1,51 +0,0 @@
-package main
-
-import (
-	"fmt"
-	"machine"
-	"time"
-
-	"tinygo.org/x/drivers/sdcard"
-)
-
-var (
-	spi    machine.SPI
-	sckPin machine.Pin
-	sdoPin machine.Pin
-	sdiPin machine.Pin
-	csPin  machine.Pin
-	ledPin machine.Pin
-)
-
-func main() {
-	waitSerial()
-	fmt.Printf("sdcard console\r\n")
-
-	led := ledPin
-	led.Configure(machine.PinConfig{Mode: machine.PinOutput})
-
-	sd := sdcard.New(spi, sckPin, sdoPin, sdiPin, csPin)
-	err := sd.Configure()
-	if err != nil {
-		fmt.Printf("%s\r\n", err.Error())
-		for {
-			time.Sleep(time.Hour)
-		}
-	}
-
-	go RunFor(&sd)
-
-	for {
-		led.High()
-		time.Sleep(200 * time.Millisecond)
-		led.Low()
-		time.Sleep(200 * time.Millisecond)
-	}
-}
-
-// Wait for user to open serial console
-func waitSerial() {
-	for !machine.Serial.DTR() {
-		time.Sleep(100 * time.Millisecond)
-	}
-}
@@ -1,17 +0,0 @@
-// +build p1am_100
-
-package main
-
-import (
-	"machine"
-)
-
-func init() {
-	spi = machine.SDCARD_SPI
-	sckPin = machine.SDCARD_SCK_PIN
-	sdoPin = machine.SDCARD_SDO_PIN
-	sdiPin = machine.SDCARD_SDI_PIN
-	csPin = machine.SDCARD_SS_PIN
-
-	ledPin = machine.LED
-}
@@ -1,17 +0,0 @@
-// +build pygamer
-
-package main
-
-import (
-	"machine"
-)
-
-func init() {
-	spi = machine.SPI0
-	sckPin = machine.SPI0_SCK_PIN
-	sdoPin = machine.SPI0_SDO_PIN
-	sdiPin = machine.SPI0_SDI_PIN
-	csPin = machine.D4
-
-	ledPin = machine.LED
-}
@@ -1,17 +0,0 @@
-// +build pyportal
-
-package main
-
-import (
-	"machine"
-)
-
-func init() {
-	spi = machine.SPI0
-	sckPin = machine.SPI0_SCK_PIN
-	sdoPin = machine.SPI0_SDO_PIN
-	sdiPin = machine.SPI0_SDI_PIN
-	csPin = machine.D32 // SD_CS
-
-	ledPin = machine.LED
-}
@@ -1,17 +0,0 @@
-// +build wioterminal
-
-package main
-
-import (
-	"machine"
-)
-
-func init() {
-	spi = machine.SPI2
-	sckPin = machine.SCK2
-	sdoPin = machine.SDO2
-	sdiPin = machine.SDI2
-	csPin = machine.SS2
-
-	ledPin = machine.LED
-}
@@ -1,519 +0,0 @@
-// +build tinygo
-
-package console
-
-import (
-	"fmt"
-	"io"
-	"machine"
-	"os"
-	"strconv"
-	"strings"
-	"time"
-
-	"github.com/tinygo-org/tinyfs"
-)
-
-const consoleBufLen = 64
-
-const startBlock = 0
-const blockCount = 0
-
-var (
-	debug = false
-
-	input [consoleBufLen]byte
-
-	console  = machine.Serial
-	readyLED = machine.LED
-
-	flashdev tinyfs.BlockDevice
-	fs       tinyfs.Filesystem
-
-	currdir = "/"
-
-	commands = map[string]cmdfunc{
-		"":        noop,
-		"dbg":     dbg,
-		"lsblk":   lsblk,
-		"mount":   mount,
-		"umount":  umount,
-		"format":  format,
-		"xxd":     xxd,
-		"ls":      ls,
-		"samples": samples,
-		"mkdir":   mkdir,
-		"cat":     cat,
-		"create":  create,
-		"write":   write,
-		"rm":      rm,
-	}
-)
-
-type cmdfunc func(argv []string)
-
-const (
-	StateInput = iota
-	StateEscape
-	StateEscBrc
-	StateCSI
-)
-
-func RunFor(dev tinyfs.BlockDevice, filesys tinyfs.Filesystem) {
-	flashdev = dev
-	fs = filesys
-
-	readyLED.Configure(machine.PinConfig{Mode: machine.PinOutput})
-	readyLED.High()
-
-	readyLED.Low()
-	println("SPI Configured. Reading flash info")
-
-	/*
-		lfsConfig := flashlfs.NewConfig()
-		if blockCount == 0 {
-			lfsConfig.BlockCount = (flashdev.Attrs().TotalSize / lfsConfig.BlockSize) - startBlock
-		} else {
-			lfsConfig.BlockCount = blockCount
-		}
-		println("Start block:", startBlock)
-		println("Block count:", lfsConfig.BlockCount)
-
-		blockdev = flashlfs.NewBlockDevice(flashdev, startBlock, lfsConfig.BlockSize)
-	*/
-
-	prompt()
-
-	var state = StateInput
-
-	for i := 0; ; {
-		if console.Buffered() > 0 {
-			data, _ := console.ReadByte()
-			if debug {
-				fmt.Printf("\rdata: %x\r\n\r", data)
-				prompt()
-				console.Write(input[:i])
-			}
-			switch state {
-			case StateInput:
-				switch data {
-				case 0x8:
-					fallthrough
-				case 0x7f: // this is probably wrong... works on my machine tho :)
-					// backspace
-					if i > 0 {
-						i -= 1
-						console.Write([]byte{0x8, 0x20, 0x8})
-					}
-				case 13:
-					// return key
-					if console.Buffered() > 0 {
-						data, _ := console.ReadByte()
-						if data != 10 {
-							println("\r\nunexpected: \r", int(data))
-						}
-					}
-					console.Write([]byte("\r\n"))
-					runCommand(string(input[:i]))
-					prompt()
-
-					i = 0
-					continue
-				case 27:
-					// escape
-					state = StateEscape
-				default:
-					// anything else, just echo the character if it is printable
-					if strconv.IsPrint(rune(data)) {
-						if i < (consoleBufLen - 1) {
-							console.WriteByte(data)
-							input[i] = data
-							i++
-						}
-					}
-				}
-			case StateEscape:
-				switch data {
-				case 0x5b:
-					state = StateEscBrc
-				default:
-					state = StateInput
-				}
-			default:
-				// TODO: handle escape sequences
-				state = StateInput
-			}
-		}
-	}
-}
-
-func runCommand(line string) {
-	argv := strings.SplitN(strings.TrimSpace(line), " ", -1)
-	cmd := argv[0]
-	cmdfn, ok := commands[cmd]
-	if !ok {
-		println("unknown command: " + line)
-		return
-	}
-	cmdfn(argv)
-}
-
-func noop(argv []string) {}
-
-func dbg(argv []string) {
-	if debug {
-		debug = false
-		println("Console debugging off")
-	} else {
-		debug = true
-		println("Console debugging on")
-	}
-}
-
-func lsblk(argv []string) {
-	fmt.Printf("lsblk : not implement\r\n")
-}
-
-func mount(argv []string) {
-	if err := fs.Mount(); err != nil {
-		println("Could not mount LittleFS filesystem: " + err.Error() + "\r\n")
-	} else {
-		println("Successfully mounted LittleFS filesystem.\r\n")
-	}
-}
-
-func format(argv []string) {
-	if err := fs.Format(); err != nil {
-		println("Could not format LittleFS filesystem: " + err.Error() + "\r\n")
-	} else {
-		println("Successfully formatted LittleFS filesystem.\r\n")
-	}
-}
-
-func umount(argv []string) {
-	if err := fs.Unmount(); err != nil {
-		println("Could not unmount LittleFS filesystem: " + err.Error() + "\r\n")
-	} else {
-		println("Successfully unmounted LittleFS filesystem.\r\n")
-	}
-}
-
-/*
-	var err error
-	if fatfs == nil {
-		fatfs, err = fat.New(fatdisk)
-		if err != nil {
-			fatfs = nil
-			println("could not load FAT filesystem: " + err.Error() + "\r\n")
-		}
-		fmt.Printf("loaded fs\r\n")
-	}
-	if rootdir == nil {
-		rootdir, err = fatfs.RootDir()
-		if err != nil {
-			rootdir = nil
-			println("could not load rootdir: " + err.Error() + "\r\n")
-		}
-		fmt.Printf("loaded rootdir\r\n")
-	}
-	if currdir == nil {
-		currdir = rootdir
-	}
-*/
-
-func ls(argv []string) {
-	path := "/"
-	if len(argv) > 1 {
-		path = strings.TrimSpace(argv[1])
-	}
-	dir, err := fs.Open(path)
-	if err != nil {
-		fmt.Printf("Could not open directory %s: %v\r\n", path, err)
-		return
-	}
-	defer dir.Close()
-	infos, err := dir.Readdir(0)
-	_ = infos
-	if err != nil {
-		fmt.Printf("Could not read directory %s: %v\r\n", path, err)
-		return
-	}
-	for _, info := range infos {
-		s := "-rwxrwxrwx"
-		if info.IsDir() {
-			s = "drwxrwxrwx"
-		}
-		fmt.Printf("%s %5d %s\r\n", s, info.Size(), info.Name())
-	}
-}
-
-func mkdir(argv []string) {
-	tgt := ""
-	if len(argv) == 2 {
-		tgt = strings.TrimSpace(argv[1])
-	}
-	if debug {
-		println("Trying mkdir to " + tgt)
-	}
-	if tgt == "" {
-		println("Usage: mkdir <target dir>")
-		return
-	}
-	err := fs.Mkdir(tgt, 0777)
-	if err != nil {
-		println("Could not mkdir " + tgt + ": " + err.Error())
-	}
-}
-
-func rm(argv []string) {
-	tgt := ""
-	if len(argv) == 2 {
-		tgt = strings.TrimSpace(argv[1])
-	}
-	if debug {
-		println("Trying rm to " + tgt)
-	}
-	if tgt == "" {
-		println("Usage: rm <target dir>")
-		return
-	}
-	err := fs.Remove(tgt)
-	if err != nil {
-		println("Could not rm " + tgt + ": " + err.Error())
-	}
-}
-
-func samples(argv []string) {
-	buf := make([]byte, 90)
-	for i := 0; i < 5; i++ {
-		name := fmt.Sprintf("file%d.txt", i)
-		if bytes, err := createSampleFile(name, buf); err != nil {
-			fmt.Printf("%s\r\n", err)
-			return
-		} else {
-			fmt.Printf("wrote %d bytes to %s\r\n", bytes, name)
-		}
-	}
-}
-
-func create(argv []string) {
-	tgt := ""
-	if len(argv) == 2 {
-		tgt = strings.TrimSpace(argv[1])
-	}
-	if debug {
-		println("Trying create to " + tgt)
-	}
-	buf := make([]byte, 90)
-	if bytes, err := createSampleFile(tgt, buf); err != nil {
-		fmt.Printf("%s\r\n", err)
-		return
-	} else {
-		fmt.Printf("wrote %d bytes to %s\r\n", bytes, tgt)
-	}
-}
-
-func write(argv []string) {
-	tgt := ""
-	if len(argv) == 2 {
-		tgt = strings.TrimSpace(argv[1])
-	}
-	if debug {
-		println("Trying receive to " + tgt)
-	}
-	buf := make([]byte, 1)
-	f, err := fs.OpenFile(tgt, os.O_CREATE|os.O_WRONLY|os.O_TRUNC)
-	if err != nil {
-		fmt.Printf("error opening %s: %s\r\n", tgt, err.Error())
-		return
-	}
-	defer f.Close()
-	var n int
-	for {
-		if console.Buffered() > 0 {
-			data, _ := console.ReadByte()
-			switch data {
-			case 0x04:
-				fmt.Printf("wrote %d bytes to %s\r\n", n, tgt)
-				return
-			default:
-				// anything else, just echo the character if it is printable
-				if strconv.IsPrint(rune(data)) {
-					console.WriteByte(data)
-				}
-				buf[0] = data
-				if _, err := f.Write(buf); err != nil {
-					fmt.Printf("\nerror writing: %s\r\n", err)
-					return
-				}
-				n++
-			}
-		}
-	}
-}
-
-func createSampleFile(name string, buf []byte) (int, error) {
-	for j := uint8(0); j < uint8(len(buf)); j++ {
-		buf[j] = 0x20 + j
-	}
-	f, err := fs.OpenFile(name, os.O_CREATE|os.O_WRONLY|os.O_TRUNC)
-	if err != nil {
-		return 0, fmt.Errorf("error opening %s: %s", name, err.Error())
-	}
-	defer f.Close()
-	bytes, err := f.Write(buf)
-	if err != nil {
-		return 0, fmt.Errorf("error writing %s: %s", name, err.Error())
-	}
-	return bytes, nil
-}
-
-/*
-func cd(argv []string) {
-
-	if fatfs == nil || rootdir == nil {
-		mnt(nil)
-	}
-	if len(argv) == 1 {
-		currdir = rootdir
-		return
-	}
-	tgt := ""
-	if len(argv) == 2 {
-		tgt = strings.TrimSpace(argv[1])
-	}
-	if debug {
-		println("Trying to cd to " + tgt)
-	}
-	if tgt == "" {
-		println("Usage: cd <target dir>")
-		return
-	}
-	if debug {
-		println("Getting entry")
-	}
-	entry := currdir.Entry(tgt)
-	if entry == nil {
-		println("File not found: " + tgt)
-		return
-	}
-	if !entry.IsDir() {
-		println("Not a directory: " + tgt)
-		return
-	}
-	if debug {
-		println("Getting dir")
-	}
-	cd, err := entry.Dir()
-	if err != nil {
-		println("Could not cd to " + tgt + ": " + err.Error())
-	}
-	currdir = cd
-}
-*/
-
-func cat(argv []string) {
-	tgt := ""
-	if len(argv) == 2 {
-		tgt = strings.TrimSpace(argv[1])
-	}
-	if debug {
-		println("Trying to cat to " + tgt)
-	}
-	if tgt == "" {
-		println("Usage: cat <target dir>")
-		return
-	}
-	if debug {
-		println("Getting entry")
-	}
-	f, err := fs.Open(tgt)
-	if err != nil {
-		println("Could not open: " + err.Error())
-		return
-	}
-	defer f.Close()
-	if f.IsDir() {
-		println("Not a file: " + tgt)
-		return
-	}
-	off := 0x0
-	buf := make([]byte, 64)
-	for {
-		n, err := f.Read(buf)
-		if err != nil {
-			if err == io.EOF {
-				break
-			}
-			println("Error reading " + tgt + ": " + err.Error())
-			time.Sleep(1 * time.Second)
-		}
-		xxdfprint(os.Stdout, uint32(off), buf[:n])
-		off += n
-	}
-}
-
-func xxd(argv []string) {
-	var err error
-	var addr uint64 = 0x0
-	var size int = 64
-	switch len(argv) {
-	case 3:
-		if size, err = strconv.Atoi(argv[2]); err != nil {
-			println("Invalid size argument: " + err.Error() + "\r\n")
-			return
-		}
-		if size > 512 || size < 1 {
-			fmt.Printf("Size of hexdump must be greater than 0 and less than %d\r\n", 512)
-			return
-		}
-		fallthrough
-	case 2:
-		/*
-			if argv[1][:2] != "0x" {
-				println("Invalid hex address (should start with 0x)")
-				return
-			}
-		*/
-		if addr, err = strconv.ParseUint(argv[1], 16, 32); err != nil {
-			println("Invalid address: " + err.Error() + "\r\n")
-			return
-		}
-		fallthrough
-	case 1:
-		// no args supplied, so nothing to do here, just use the defaults
-	default:
-		println("usage: xxd <hex address, ex: 0xA0> <size of hexdump in bytes>\r\n")
-		return
-	}
-	buf := make([]byte, size)
-	//bsz := uint64(flash.SectorSize)
-	//blockdev.ReadBlock(uint32(addr/bsz), uint32(addr%bsz), buf)
-	flashdev.ReadAt(buf, int64(addr))
-	xxdfprint(os.Stdout, uint32(addr), buf)
-}
-
-func xxdfprint(w io.Writer, offset uint32, b []byte) {
-	var l int
-	var buf16 = make([]byte, 16)
-	for i, c := 0, len(b); i < c; i += 16 {
-		l = i + 16
-		if l >= c {
-			l = c
-		}
-		fmt.Fprintf(w, "%08x: % x    ", offset+uint32(i), b[i:l])
-		for j, n := 0, l-i; j < 16; j++ {
-			if j >= n || !strconv.IsPrint(rune(b[i+j])) || b[i+j] >= 0x80 {
-				buf16[j] = '.'
-			} else {
-				buf16[j] = b[i+j]
-			}
-		}
-		console.Write(buf16)
-		println()
-	}
-}
-
-func prompt() {
-	print("==> ")
-}
@@ -1,17 +0,0 @@
-// +build feather_m4 feather_m4_can feather_nrf52840
-
-package main
-
-import (
-	"machine"
-)
-
-func init() {
-	spi = machine.SPI0
-	sckPin = machine.SPI0_SCK_PIN
-	sdoPin = machine.SPI0_SDO_PIN
-	sdiPin = machine.SPI0_SDI_PIN
-	csPin = machine.D10
-
-	ledPin = machine.LED
-}
@@ -1,17 +0,0 @@
-// +build grandcentral-m4
-
-package main
-
-import (
-	"machine"
-)
-
-func init() {
-	spi = machine.SPI1
-	sckPin = machine.SDCARD_SCK_PIN
-	sdoPin = machine.SDCARD_SDO_PIN
-	sdiPin = machine.SDCARD_SDI_PIN
-	csPin = machine.SDCARD_CS_PIN
-
-	ledPin = machine.LED
-}
@@ -1,17 +0,0 @@
-// +build atsamd21,!p1am_100
-
-package main
-
-import (
-	"machine"
-)
-
-func init() {
-	spi = machine.SPI0
-	sckPin = machine.SPI0_SCK_PIN
-	sdoPin = machine.SPI0_SDO_PIN
-	sdiPin = machine.SPI0_SDI_PIN
-	csPin = machine.D2
-
-	ledPin = machine.LED
-}
@@ -1,49 +0,0 @@
-package main
-
-import (
-	"fmt"
-	"machine"
-	"time"
-
-	"github.com/tinygo-org/tinyfs/fatfs"
-	"tinygo.org/x/drivers/examples/sdcard/tinyfs/console"
-	"tinygo.org/x/drivers/sdcard"
-)
-
-var (
-	spi    machine.SPI
-	sckPin machine.Pin
-	sdoPin machine.Pin
-	sdiPin machine.Pin
-	csPin  machine.Pin
-	ledPin machine.Pin
-)
-
-func main() {
-	waitSerial()
-
-	sd := sdcard.New(spi, sckPin, sdoPin, sdiPin, csPin)
-	err := sd.Configure()
-	if err != nil {
-		fmt.Printf("%s\r\n", err.Error())
-		for {
-			time.Sleep(time.Hour)
-		}
-	}
-
-	filesystem := fatfs.New(&sd)
-
-	// Configure FATFS with sector size (must match value in ff.h - use 512)
-	filesystem.Configure(&fatfs.Config{
-		SectorSize: 512,
-	})
-
-	console.RunFor(&sd, filesystem)
-}
-
-// Wait for user to open serial console
-func waitSerial() {
-	for !machine.Serial.DTR() {
-		time.Sleep(100 * time.Millisecond)
-	}
-}
@@ -1,17 +0,0 @@
-// +build p1am_100
-
-package main
-
-import (
-	"machine"
-)
-
-func init() {
-	spi = machine.SDCARD_SPI
-	sckPin = machine.SDCARD_SCK_PIN
-	sdoPin = machine.SDCARD_SDO_PIN
-	sdiPin = machine.SDCARD_SDI_PIN
-	csPin = machine.SDCARD_SS_PIN
-
-	ledPin = machine.LED
-}
@@ -1,17 +0,0 @@
-// +build pygamer
-
-package main
-
-import (
-	"machine"
-)
-
-func init() {
-	spi = machine.SPI0
-	sckPin = machine.SPI0_SCK_PIN
-	sdoPin = machine.SPI0_SDO_PIN
-	sdiPin = machine.SPI0_SDI_PIN
-	csPin = machine.D4
-
-	ledPin = machine.LED
-}
@@ -1,17 +0,0 @@
-// +build pyportal
-
-package main
-
-import (
-	"machine"
-)
-
-func init() {
-	spi = machine.SPI0
-	sckPin = machine.SPI0_SCK_PIN
-	sdoPin = machine.SPI0_SDO_PIN
-	sdiPin = machine.SPI0_SDI_PIN
-	csPin = machine.D32 // SD_CS
-
-	ledPin = machine.LED
-}
@@ -1,17 +0,0 @@
-// +build wioterminal
-
-package main
-
-import (
-	"machine"
-)
-
-func init() {
-	spi = machine.SPI2
-	sckPin = machine.SCK2
-	sdoPin = machine.SDO2
-	sdiPin = machine.SDI2
-	csPin = machine.SS2
-
-	ledPin = machine.LED
-}
@@ -1,43 +0,0 @@
-package main
-
-import (
-	"machine"
-	"time"
-
-	"tinygo.org/x/drivers/servo"
-)
-
-// Configuration for the Arduino Uno.
-// Please change the PWM and pin if you want to try this example on a different
-// board.
-var (
-	pwm = machine.Timer1
-	pin = machine.D9
-)
-
-func main() {
-	s, err := servo.New(pwm, pin)
-	if err != nil {
-		for {
-			println("could not configure servo")
-			time.Sleep(time.Second)
-		}
-		return
-	}
-
-	println("setting to 0°")
-	s.SetMicroseconds(1000)
-	time.Sleep(3 * time.Second)
-
-	println("setting to 45°")
-	s.SetMicroseconds(1500)
-	time.Sleep(3 * time.Second)
-
-	println("setting to 90°")
-	s.SetMicroseconds(2000)
-	time.Sleep(3 * time.Second)
-
-	for {
-		time.Sleep(time.Second)
-	}
-}
@@ -1,60 +0,0 @@
-// This example shows how to use 128x64 display over I2C
-// Tested on Seeeduino XIAO Expansion Board https://wiki.seeedstudio.com/Seeeduino-XIAO-Expansion-Board/
-//
-// According to manual, I2C address of the display is 0x78, but that's 8-bit address.
-// TinyGo operates on 7-bit addresses and respective 7-bit address would be 0x3C, which we use below.
-//
-// To learn more about different types of I2C addresses, please see following page
-// https://www.totalphase.com/support/articles/200349176-7-bit-8-bit-and-10-bit-I2C-Slave-Addressing
-
-package main
-
-import (
-	"machine"
-
-	"image/color"
-	"time"
-
-	"tinygo.org/x/drivers/ssd1306"
-)
-
-func main() {
-	machine.I2C0.Configure(machine.I2CConfig{
-		Frequency: machine.TWI_FREQ_400KHZ,
-	})
-
-	display := ssd1306.NewI2C(machine.I2C0)
-	display.Configure(ssd1306.Config{
-		Address: 0x3C,
-		Width:   128,
-		Height:  64,
-	})
-
-	display.ClearDisplay()
-
-	x := int16(0)
-	y := int16(0)
-	deltaX := int16(1)
-	deltaY := int16(1)
-	for {
-		pixel := display.GetPixel(x, y)
-		c := color.RGBA{255, 255, 255, 255}
-		if pixel {
-			c = color.RGBA{0, 0, 0, 255}
-		}
-		display.SetPixel(x, y, c)
-		display.Display()
-
-		x += deltaX
-		y += deltaY
-
-		if x == 0 || x == 127 {
-			deltaX = -deltaX
-		}
-
-		if y == 0 || y == 63 {
-			deltaY = -deltaY
-		}
-		time.Sleep(1 * time.Millisecond)
-	}
-}
@@ -1,4 +1,4 @@
-package main
+package ssd1331

 import (
 	"machine"
@@ -1,4 +1,4 @@
-package main
+package ssd1351

 import (
 	"machine"
@@ -1,40 +0,0 @@
-package main
-
-import (
-	"machine"
-	"time"
-
-	"tinygo.org/x/drivers/tm1637"
-)
-
-func main() {
-
-	tm := tm1637.New(machine.D2, machine.D3, 7) // clk, dio, brightness
-	tm.Configure()
-
-	tm.ClearDisplay()
-
-	tm.DisplayText([]byte("Tiny"))
-	time.Sleep(time.Millisecond * 1000)
-
-	tm.ClearDisplay()
-
-	tm.DisplayChr(byte('G'), 1)
-	tm.DisplayDigit(0, 2) // looks like O
-	time.Sleep(time.Millisecond * 1000)
-
-	tm.DisplayClock(12, 59, true)
-
-	for i := uint8(0); i < 8; i++ {
-		tm.Brightness(i)
-		time.Sleep(time.Millisecond * 200)
-	}
-
-	i := int16(0)
-	for {
-		tm.DisplayNumber(i)
-		i++
-		time.Sleep(time.Millisecond * 50)
-	}
-
-}
@@ -1,33 +0,0 @@
-package main
-
-import (
-	"machine"
-	"time"
-
-	"tinygo.org/x/drivers/tone"
-)
-
-var (
-	// Configuration for the Adafruit Circuit Playground Bluefruit.
-	pwm = machine.PWM0
-	pin = machine.D12
-)
-
-func main() {
-	speaker, err := tone.New(pwm, pin)
-	if err != nil {
-		println("failed to configure PWM")
-		return
-	}
-
-	// Two tone siren.
-	for {
-		println("nee")
-		speaker.SetNote(tone.B5)
-		time.Sleep(time.Second / 2)
-
-		println("naw")
-		speaker.SetNote(tone.A5)
-		time.Sleep(time.Second / 2)
-	}
-}
@@ -1,146 +0,0 @@
-// This example connects to Access Point and prints some info
-package main
-
-import (
-	"machine"
-	"strconv"
-	"time"
-
-	"tinygo.org/x/drivers/wifinina"
-)
-
-// access point info
-const ssid = ""
-const pass = ""
-
-// these are the default pins for the Arduino Nano33 IoT.
-// change these to connect to a different UART or pins for the ESP8266/ESP32
-var (
-
-	// these are the default pins for the Arduino Nano33 IoT.
-	spi = machine.NINA_SPI
-
-	// this is the ESP chip that has the WIFININA firmware flashed on it
-	adaptor *wifinina.Device
-)
-
-func setup() {
-
-	// Configure SPI for 8Mhz, Mode 0, MSB First
-	spi.Configure(machine.SPIConfig{
-		Frequency: 8 * 1e6,
-		SDO:       machine.NINA_SDO,
-		SDI:       machine.NINA_SDI,
-		SCK:       machine.NINA_SCK,
-	})
-
-	adaptor = wifinina.New(spi,
-		machine.NINA_CS,
-		machine.NINA_ACK,
-		machine.NINA_GPIO0,
-		machine.NINA_RESETN)
-	adaptor.Configure()
-}
-
-func main() {
-
-	setup()
-
-	waitSerial()
-
-	connectToAP()
-
-	for {
-		println("----------------------------------------")
-		printSSID()
-		printRSSI()
-		printMac()
-		printIPs()
-		printTime()
-		time.Sleep(10 * time.Second)
-	}
-
-}
-
-func printSSID() {
-	print("SSID: ")
-	ssid, err := adaptor.GetCurrentSSID()
-	if err != nil {
-		println("Unknown (error: ", err.Error(), ")")
-		return
-	}
-	println(ssid)
-}
-
-func printRSSI() {
-	print("RSSI: ")
-	rssi, err := adaptor.GetCurrentRSSI()
-	if err != nil {
-		println("Unknown (error: ", err.Error(), ")")
-		return
-	}
-	println(strconv.Itoa(int(rssi)))
-}
-
-func printIPs() {
-	ip, subnet, gateway, err := adaptor.GetIP()
-	if err != nil {
-		println("IP: Unknown (error: ", err.Error(), ")")
-		return
-	}
-	println("IP: ", ip.String())
-	println("Subnet: ", subnet.String())
-	println("Gateway: ", gateway.String())
-}
-
-func printTime() {
-	print("Time: ")
-	t, err := adaptor.GetTime()
-	for {
-		if err != nil {
-			println("Unknown (error: ", err.Error(), ")")
-			return
-		}
-		if t != 0 {
-			break
-		}
-		time.Sleep(time.Second)
-		t, err = adaptor.GetTime()
-	}
-	println(time.Unix(int64(t), 0).String())
-}
-
-func printMac() {
-	print("MAC: ")
-	mac, err := adaptor.GetMACAddress()
-	if err != nil {
-		println("Unknown (", err.Error(), ")")
-	}
-	println(mac.String())
-}
-
-// Wait for user to open serial console
-func waitSerial() {
-	for !machine.Serial.DTR() {
-		time.Sleep(100 * time.Millisecond)
-	}
-}
-
-// connect to access point
-func connectToAP() {
-	if len(ssid) == 0 || len(pass) == 0 {
-		for {
-			println("Connection failed: Either ssid or password not set")
-			time.Sleep(10 * time.Second)
-		}
-	}
-	time.Sleep(2 * time.Second)
-	println("Connecting to " + ssid)
-	adaptor.SetPassphrase(ssid, pass)
-	for st, _ := adaptor.GetConnectionStatus(); st != wifinina.StatusConnected; {
-		println("Connection status: " + st.String())
-		time.Sleep(1 * time.Second)
-		st, _ = adaptor.GetConnectionStatus()
-	}
-	println("Connected.")
-}
@@ -35,7 +35,10 @@ const server = "tcp://test.mosquitto.org:1883"
 var (

 	// these are the default pins for the Arduino Nano33 IoT.
-	spi = machine.NINA_SPI
+	uart = machine.UART2
+	tx   = machine.NINA_TX
+	rx   = machine.NINA_RX
+	spi  = machine.NINA_SPI

 	// this is the ESP chip that has the WIFININA firmware flashed on it
 	adaptor *wifinina.Device
@@ -45,6 +48,7 @@ var (
 func main() {
 	time.Sleep(3000 * time.Millisecond)

+	uart.Configure(machine.UARTConfig{TX: tx, RX: rx})
 	rand.Seed(time.Now().UnixNano())

 	// Configure SPI for 8Mhz, Mode 0, MSB First
@@ -90,7 +94,7 @@ func main() {
 				println(err.Error())
 			}
 		}
-		time.Sleep(100 * time.Millisecond)
+		time.Sleep(1 * time.Millisecond)
 	}

 	// Right now this code is never reached. Need a way to trigger it...
@@ -32,8 +32,12 @@ const server = "tcp://test.mosquitto.org:1883"

 // change these to connect to a different UART or pins for the ESP8266/ESP32
 var (
+
 	// these are the default pins for the Arduino Nano33 IoT.
-	spi = machine.NINA_SPI
+	uart = machine.UART2
+	tx   = machine.NINA_TX
+	rx   = machine.NINA_RX
+	spi  = machine.NINA_SPI

 	// this is the ESP chip that has the WIFININA firmware flashed on it
 	adaptor *wifinina.Device
@@ -51,6 +55,7 @@ func subHandler(client mqtt.Client, msg mqtt.Message) {
 func main() {
 	time.Sleep(3000 * time.Millisecond)

+	uart.Configure(machine.UARTConfig{TX: tx, RX: rx})
 	rand.Seed(time.Now().UnixNano())

 	// Configure SPI for 8Mhz, Mode 0, MSB First
@@ -23,41 +23,33 @@ const ntpHost = "129.6.15.29"

 const NTP_PACKET_SIZE = 48

-// these are the default pins for the Arduino Nano33 IoT.
-// change these to connect to a different UART or pins for the ESP8266/ESP32
 var (
-
-	// these are the default pins for the Arduino Nano33 IoT.
-	spi = machine.NINA_SPI
-
 	// this is the ESP chip that has the WIFININA firmware flashed on it
 	adaptor *wifinina.Device
 	b       = make([]byte, NTP_PACKET_SIZE)
 )

-func setup() {
+func main() {
+
+	// Init esp32
 	// Configure SPI for 8Mhz, Mode 0, MSB First
-	spi.Configure(machine.SPIConfig{
+	machine.NINA_SPI.Configure(machine.SPIConfig{
 		Frequency: 8 * 1e6,
 		SDO:       machine.NINA_SDO,
 		SDI:       machine.NINA_SDI,
 		SCK:       machine.NINA_SCK,
 	})

-	adaptor = wifinina.New(spi,
+	// these are the default pins for the Arduino Nano33 IoT.
+	adaptor = wifinina.New(machine.NINA_SPI,
 		machine.NINA_CS,
 		machine.NINA_ACK,
 		machine.NINA_GPIO0,
 		machine.NINA_RESETN)
+
 	adaptor.Configure()
-}
-
-func main() {
-
-	setup()
-
-	waitSerial()

+	// connect to access point
 	connectToAP()

 	// now make UDP connection
@@ -88,13 +80,10 @@ func main() {
 		}
 	}

-}
-
-// Wait for user to open serial console
-func waitSerial() {
-	for !machine.Serial.DTR() {
-		time.Sleep(100 * time.Millisecond)
-	}
+	// Right now this code is never reached. Need a way to trigger it...
+	println("Disconnecting UDP...")
+	conn.Close()
+	println("Done.")
 }

 func getCurrentTime(conn *net.UDPSerialConn) (time.Time, error) {
@@ -151,12 +140,6 @@ func clearBuffer() {

 // connect to access point
 func connectToAP() {
-	if len(ssid) == 0 || len(pass) == 0 {
-		for {
-			println("Connection failed: Either ssid or password not set")
-			time.Sleep(10 * time.Second)
-		}
-	}
 	time.Sleep(2 * time.Second)
 	message("Connecting to " + ssid)
 	adaptor.SetPassphrase(ssid, pass)
@@ -29,7 +29,10 @@ const serverIP = ""
 var (

 	// these are the default pins for the Arduino Nano33 IoT.
-	spi = machine.NINA_SPI
+	uart = machine.UART2
+	tx   = machine.NINA_TX
+	rx   = machine.NINA_RX
+	spi  = machine.NINA_SPI

 	// this is the ESP chip that has the WIFININA firmware flashed on it
 	adaptor *wifinina.Device
@@ -39,6 +42,8 @@ var buf = &bytes.Buffer{}

 func main() {

+	uart.Configure(machine.UARTConfig{TX: tx, RX: rx})
+
 	// Configure SPI for 8Mhz, Mode 0, MSB First
 	spi.Configure(machine.SPIConfig{
 		Frequency: 8 * 1e6,
@@ -1,151 +0,0 @@
-// This example opens a TCP connection using a device with WiFiNINA firmware
-// and sends a HTTPS request to retrieve a webpage
-//
-// You shall see "strict-transport-security" header in the response,
-// this confirms communication is indeed over HTTPS
-// https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Strict-Transport-Security
-//
-package main
-
-import (
-	"fmt"
-	"machine"
-	"strings"
-	"time"
-
-	"tinygo.org/x/drivers/net"
-	"tinygo.org/x/drivers/net/tls"
-	"tinygo.org/x/drivers/wifinina"
-)
-
-// access point info
-const ssid = ""
-const pass = ""
-
-// IP address of the server aka "hub". Replace with your own info.
-const server = "tinygo.org"
-
-// these are the default pins for the Arduino Nano33 IoT.
-// change these to connect to a different UART or pins for the ESP8266/ESP32
-var (
-
-	// these are the default pins for the Arduino Nano33 IoT.
-	spi = machine.NINA_SPI
-
-	// this is the ESP chip that has the WIFININA firmware flashed on it
-	adaptor *wifinina.Device
-)
-
-var buf [256]byte
-
-var lastRequestTime time.Time
-var conn net.Conn
-
-func setup() {
-	// Configure SPI for 8Mhz, Mode 0, MSB First
-	spi.Configure(machine.SPIConfig{
-		Frequency: 8 * 1e6,
-		SDO:       machine.NINA_SDO,
-		SDI:       machine.NINA_SDI,
-		SCK:       machine.NINA_SCK,
-	})
-
-	adaptor = wifinina.New(spi,
-		machine.NINA_CS,
-		machine.NINA_ACK,
-		machine.NINA_GPIO0,
-		machine.NINA_RESETN)
-	adaptor.Configure()
-}
-
-func main() {
-
-	setup()
-
-	waitSerial()
-
-	connectToAP()
-
-	for {
-		readConnection()
-		if time.Now().Sub(lastRequestTime).Milliseconds() >= 10000 {
-			makeHTTPSRequest()
-		}
-	}
-
-}
-
-// Wait for user to open serial console
-func waitSerial() {
-	for !machine.Serial.DTR() {
-		time.Sleep(100 * time.Millisecond)
-	}
-}
-
-func readConnection() {
-	if conn != nil {
-		for n, err := conn.Read(buf[:]); n > 0; n, err = conn.Read(buf[:]) {
-			if err != nil {
-				println("Read error: " + err.Error())
-			} else {
-				print(string(buf[0:n]))
-			}
-		}
-	}
-}
-
-func makeHTTPSRequest() {
-
-	var err error
-	if conn != nil {
-		conn.Close()
-	}
-
-	message("\r\n---------------\r\nDialing TCP connection")
-	conn, err = tls.Dial("tcp", server, nil)
-	for ; err != nil; conn, err = tls.Dial("tcp", server, nil) {
-		message("Connection failed: " + err.Error())
-		time.Sleep(5 * time.Second)
-	}
-	println("Connected!\r")
-
-	print("Sending HTTPS request...")
-	fmt.Fprintln(conn, "GET / HTTP/1.1")
-	fmt.Fprintln(conn, "Host:", strings.Split(server, ":")[0])
-	fmt.Fprintln(conn, "User-Agent: TinyGo")
-	fmt.Fprintln(conn, "Connection: close")
-	fmt.Fprintln(conn)
-	println("Sent!\r\n\r")
-
-	lastRequestTime = time.Now()
-}
-
-// connect to access point
-func connectToAP() {
-	if len(ssid) == 0 || len(pass) == 0 {
-		for {
-			println("Connection failed: Either ssid or password not set")
-			time.Sleep(10 * time.Second)
-		}
-	}
-	time.Sleep(2 * time.Second)
-	message("Connecting to " + ssid)
-	adaptor.SetPassphrase(ssid, pass)
-	for st, _ := adaptor.GetConnectionStatus(); st != wifinina.StatusConnected; {
-		message("Connection status: " + st.String())
-		time.Sleep(1 * time.Second)
-		st, _ = adaptor.GetConnectionStatus()
-	}
-	message("Connected.")
-	time.Sleep(2 * time.Second)
-	ip, _, _, err := adaptor.GetIP()
-	for ; err != nil; ip, _, _, err = adaptor.GetIP() {
-		message(err.Error())
-		time.Sleep(1 * time.Second)
-	}
-	message(ip.String())
-}
-
-func message(msg string) {
-	println(msg, "\r")
-}
@@ -27,7 +27,10 @@ const server = "tinygo.org"
 var (

 	// these are the default pins for the Arduino Nano33 IoT.
-	spi = machine.NINA_SPI
+	uart = machine.UART2
+	tx   = machine.NINA_TX
+	rx   = machine.NINA_RX
+	spi  = machine.NINA_SPI

 	// this is the ESP chip that has the WIFININA firmware flashed on it
 	adaptor *wifinina.Device
@@ -38,7 +41,10 @@ var buf [256]byte
 var lastRequestTime time.Time
 var conn net.Conn

-func setup() {
+func main() {
+
+	uart.Configure(machine.UARTConfig{TX: tx, RX: rx})
+
 	// Configure SPI for 8Mhz, Mode 0, MSB First
 	spi.Configure(machine.SPIConfig{
 		Frequency: 8 * 1e6,
@@ -53,33 +59,16 @@ func setup() {
 		machine.NINA_GPIO0,
 		machine.NINA_RESETN)
 	adaptor.Configure()
-}
-
-func main() {
-
-	setup()
-
-	waitSerial()

 	connectToAP()

 	for {
-		readConnection()
-		if time.Now().Sub(lastRequestTime).Milliseconds() >= 10000 {
-			makeHTTPRequest()
-		}
+		loop()
 	}
-
+	println("Done.")
 }

-// Wait for user to open serial console
-func waitSerial() {
-	for !machine.Serial.DTR() {
-		time.Sleep(100 * time.Millisecond)
-	}
-}
-
-func readConnection() {
+func loop() {
 	if conn != nil {
 		for n, err := conn.Read(buf[:]); n > 0; n, err = conn.Read(buf[:]) {
 			if err != nil {
@@ -89,6 +78,9 @@ func readConnection() {
 			}
 		}
 	}
+	if time.Now().Sub(lastRequestTime).Milliseconds() >= 10000 {
+		makeHTTPRequest()
+	}
 }

 func makeHTTPRequest() {
@@ -106,7 +98,7 @@ func makeHTTPRequest() {
 	message("\r\n---------------\r\nDialing TCP connection")
 	conn, err = net.DialTCP("tcp", laddr, raddr)
 	for ; err != nil; conn, err = net.DialTCP("tcp", laddr, raddr) {
-		message("Connection failed: " + err.Error())
+		message("connection failed: " + err.Error())
 		time.Sleep(5 * time.Second)
 	}
 	println("Connected!\r")
@@ -114,7 +106,7 @@ func makeHTTPRequest() {
 	print("Sending HTTP request...")
 	fmt.Fprintln(conn, "GET / HTTP/1.1")
 	fmt.Fprintln(conn, "Host:", server)
-	fmt.Fprintln(conn, "User-Agent: TinyGo")
+	fmt.Fprintln(conn, "User-Agent: TinyGo/0.10.0")
 	fmt.Fprintln(conn, "Connection: close")
 	fmt.Fprintln(conn)
 	println("Sent!\r\n\r")
@@ -122,14 +114,19 @@ func makeHTTPRequest() {
 	lastRequestTime = time.Now()
 }

-// connect to access point
-func connectToAP() {
-	if len(ssid) == 0 || len(pass) == 0 {
-		for {
-			println("Connection failed: Either ssid or password not set")
-			time.Sleep(10 * time.Second)
+func readLine(conn *net.TCPSerialConn) string {
+	println("Attempting to read...\r")
+	b := buf[:]
+	for expiry := time.Now().Unix() + 10; time.Now().Unix() > expiry; {
+		if n, err := conn.Read(b); n > 0 && err == nil {
+			return string(b[0:n])
 		}
 	}
+	return ""
+}
+
+// connect to access point
+func connectToAP() {
 	time.Sleep(2 * time.Second)
 	message("Connecting to " + ssid)
 	adaptor.SetPassphrase(ssid, pass)
@@ -4,7 +4,6 @@ package main

 import "machine"

-// Replace neo and led in the code below to match the pin
+// Replace neo in the code below to match the pin
 // that you are using if different.
 var neo = machine.D2
-var led = machine.LED
@@ -5,7 +5,6 @@ package main
 import "machine"

 // This is the pin assignment for the Digispark only.
-// Replace neo and led in the code below to match the pin
+// Replace neo in the code below to match the pin
 // that you are using if different.
 var neo machine.Pin = 0
-var led = machine.LED
@@ -15,6 +15,7 @@ import (
 var leds [10]color.RGBA

 func main() {
+	led := machine.LED
 	led.Configure(machine.PinConfig{Mode: machine.PinOutput})

 	neo.Configure(machine.PinConfig{Mode: machine.PinOutput})
@@ -1,10 +1,9 @@
-// +build !digispark,!arduino,!qtpy
+// +build !digispark,!arduino

 package main

 import "machine"

-// Replace neo and led in the code below to match the pin
+// Replace neo in the code below to match the pin
 // that you are using if different.
 var neo machine.Pin = machine.NEOPIXELS
-var led = machine.LED
@@ -1,16 +0,0 @@
-// +build qtpy
-
-package main
-
-import "machine"
-
-// Replace neo and led in the code below to match the pin
-// that you are using if different.
-var neo machine.Pin = machine.NEOPIXELS
-var led = machine.NoPin
-
-func init() {
-	pwr := machine.NEOPIXELS_POWER
-	pwr.Configure(machine.PinConfig{Mode: machine.PinOutput})
-	pwr.High()
-}
@@ -290,8 +290,9 @@ func (dev *Device) EraseBlockSize() int64 {
 // supports this. The start and len parameters are in block numbers, use
 // EraseBlockSize to map addresses to blocks.
 func (dev *Device) EraseBlocks(start, len int64) error {
+	// TODO: maybe combine sector erase operations into block erase operations
 	for i := start; i < start+len; i++ {
-		if err := dev.EraseBlock(uint32(i)); err != nil {
+		if err := dev.EraseSector(uint32(i)); err != nil {
 			return err
 		}
 	}
@@ -5,10 +5,4 @@ go 1.15
 require (
 	github.com/eclipse/paho.mqtt.golang v1.2.0
 	github.com/frankban/quicktest v1.10.2
-	github.com/sago35/tinygo-dma v0.0.0-20210610020721-297675ab9b23 // indirect
-	github.com/tinygo-org/tinyfs v0.0.0-20210514090915-924e60a7bcf8
-)
-
-replace (
-    github.com/sago35/tinygo-dma => ../../sago35/tinygo-dma
 )
@@ -9,12 +9,5 @@ github.com/kr/pretty v0.2.1/go.mod h1:ipq/a2n7PKx3OHsz4KJII5eveXtPO4qwEXGdVfWzfn
 github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
 github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
 github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
-github.com/sago35/tinygo-dma v0.0.0-20210610020721-297675ab9b23 h1:ESMYhe6RQJ2RbBCH2OK1SNyYq3gKoBpI7g07aLjQgJI=
-github.com/sago35/tinygo-dma v0.0.0-20210610020721-297675ab9b23/go.mod h1:gXCCsg4cKOJ6NJl7teGN597XgN0hzQJz0Wekayj4k+M=
-github.com/tinygo-org/tinyfs v0.0.0-20210514004344-b02c062d12c9 h1:66or7MohOph3xr3gMGCXceLkd+MBoUbV/rPPjl8iQOU=
-github.com/tinygo-org/tinyfs v0.0.0-20210514004344-b02c062d12c9/go.mod h1:HGuyo42bGd1zWSuS1gwgyyjN36ZZMlEpwM0vSrglmXc=
-github.com/tinygo-org/tinyfs v0.0.0-20210514090915-924e60a7bcf8 h1:pYwuKe1XuNeJnGV1UjeZ0FhuZ5+lapIq1NUmGacbBwo=
-github.com/tinygo-org/tinyfs v0.0.0-20210514090915-924e60a7bcf8/go.mod h1:HGuyo42bGd1zWSuS1gwgyyjN36ZZMlEpwM0vSrglmXc=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-tinygo.org/x/drivers v0.16.0/go.mod h1:uT2svMq3EpBZpKkGO+NQHjxjGf1f42ra4OnMMwQL2aI=
@@ -4,6 +4,7 @@ package gps // import "tinygo.org/x/drivers/gps"
 import (
 	"encoding/hex"
 	"errors"
+	"machine"
 	"strings"
 	"time"

@@ -20,13 +21,13 @@ type Device struct {
 	buffer   []byte
 	bufIdx   int
 	sentence strings.Builder
-	uart     drivers.UART
+	uart     *machine.UART
 	bus      drivers.I2C
 	address  uint16
 }

 // NewUART creates a new UART GPS connection. The UART must already be configured.
-func NewUART(uart drivers.UART) Device {
+func NewUART(uart *machine.UART) Device {
 	return Device{
 		uart:     uart,
 		buffer:   make([]byte, bufferSize),
@@ -57,16 +57,9 @@ func (g *GPIO) SetCommandMode(set bool) {
 	}
 }

-// WriteOnly is true if you passed rw in as machine.NoPin
-func (g *GPIO) WriteOnly() bool {
-	return g.rw == machine.NoPin
-}
-
 // Write writes len(data) bytes from data to display driver
 func (g *GPIO) Write(data []byte) (n int, err error) {
-	if !g.WriteOnly() {
-		g.rw.Low()
-	}
+	g.rw.Low()
 	for _, d := range data {
 		g.write(d)
 		n++
@@ -96,9 +89,6 @@ func (g *GPIO) Read(data []byte) (n int, err error) {
 	if len(data) == 0 {
 		return 0, errors.New("length greater than 0 is required")
 	}
-	if g.WriteOnly() {
-		return 0, errors.New("Read not supported if RW not wired")
-	}
 	g.rw.High()
 	g.reconfigureGPIOMode(machine.PinInput)
 	for i := 0; i < len(data); i++ {
@@ -11,23 +11,9 @@ import (
 	"time"
 )

-const (
-	// These are the default execution times for the Clear and
-	// Home commands and everything else.
-	//
-	// These are used if RW is passed as machine.NoPin and ignored
-	// otherwise.
-	//
-	// They are set conservatively here and can be tweaked in the
-	// Config structure.
-	DefaultClearHomeTime = 80 * time.Millisecond
-	DefaultInstrExecTime = 80 * time.Microsecond
-)
-
 type Buser interface {
 	io.ReadWriter
 	SetCommandMode(set bool)
-	WriteOnly() bool
 }

 type Device struct {
@@ -42,9 +28,6 @@ type Device struct {

 	cursor     cursor
 	busyStatus []byte
-
-	clearHomeTime time.Duration // time clear/home instructions might take
-	instrExecTime time.Duration // time all other instructions might take
 }

 type cursor struct {
@@ -52,18 +35,14 @@ type cursor struct {
 }

 type Config struct {
-	Width         int16
-	Height        int16
-	CursorBlink   bool
-	CursorOnOff   bool
-	Font          uint8
-	ClearHomeTime time.Duration // time clear/home instructions might take - use 0 for the default
-	InstrExecTime time.Duration // time all other instructions might take - use 0 for the default
+	Width       int16
+	Height      int16
+	CursorBlink bool
+	CursorOnOff bool
+	Font        uint8
 }

 // NewGPIO4Bit returns 4bit data length HD44780 driver. Datapins are LCD DB pins starting from DB4 to DB7
-//
-// If your device has RW set permanently to ground then pass in rw as machine.NoPin
 func NewGPIO4Bit(dataPins []machine.Pin, e, rs, rw machine.Pin) (Device, error) {
 	const fourBitMode = 4
 	if len(dataPins) != fourBitMode {
@@ -73,8 +52,6 @@ func NewGPIO4Bit(dataPins []machine.Pin, e, rs, rw machine.Pin) (Device, error)
 }

 // NewGPIO8Bit returns 8bit data length HD44780 driver. Datapins are LCD DB pins starting from DB0 to DB7
-//
-// If your device has RW set permanently to ground then pass in rw as machine.NoPin
 func NewGPIO8Bit(dataPins []machine.Pin, e, rs, rw machine.Pin) (Device, error) {
 	const eightBitMode = 8
 	if len(dataPins) != eightBitMode {
@@ -91,8 +68,6 @@ func (d *Device) Configure(cfg Config) error {
 	if d.width == 0 || d.height == 0 {
 		return errors.New("width and height must be set")
 	}
-	d.clearHomeTime = cfg.ClearHomeTime
-	d.instrExecTime = cfg.InstrExecTime
 	memoryMap := uint8(ONE_LINE)
 	if d.height > 1 {
 		memoryMap = TWO_LINE
@@ -211,7 +186,7 @@ func (d *Device) SendCommand(command byte) {
 	d.bus.SetCommandMode(true)
 	d.bus.Write([]byte{command})

-	for d.busy(command == DISPLAY_CLEAR || command == CURSOR_HOME) {
+	for d.Busy() {
 	}
 }

@@ -220,7 +195,7 @@ func (d *Device) sendData(data byte) {
 	d.bus.SetCommandMode(false)
 	d.bus.Write([]byte{data})

-	for d.busy(false) {
+	for d.Busy() {
 	}
 }

@@ -232,39 +207,13 @@ func (d *Device) CreateCharacter(cgramAddr uint8, data []byte) {
 	}
 }

-// busy returns true when hd447890 is busy
-// or after the timeout specified
-func (d *Device) busy(longDelay bool) bool {
-	if d.bus.WriteOnly() {
-		// Can't read busy flag if write only, so sleep a bit then return
-		if longDelay {
-			// Note that we sleep like this so the default
-			// time.Sleep is time.Sleep(constant) as
-			// time.Sleep(variable) doesn't seem to work on AVR yet
-			if d.clearHomeTime != 0 {
-				time.Sleep(d.clearHomeTime)
-			} else {
-				time.Sleep(DefaultClearHomeTime)
-			}
-		} else {
-			if d.instrExecTime != 0 {
-				time.Sleep(d.instrExecTime)
-			} else {
-				time.Sleep(DefaultInstrExecTime)
-			}
-		}
-		return false
-	}
+// Busy returns true when hd447890 is busy
+func (d *Device) Busy() bool {
 	d.bus.SetCommandMode(true)
 	d.bus.Read(d.busyStatus)
 	return (d.busyStatus[0] & BUSY) > 0
 }

-// Busy returns true when hd447890 is busy
-func (d *Device) Busy() bool {
-	return d.busy(false)
-}
-
 // Size returns the current size of the display.
 func (d *Device) Size() (w, h int16) {
 	return int16(d.width), int16(d.height)
@@ -28,35 +28,6 @@ type Device struct {
 	rd  machine.Pin
 }

-var cmdBuf [4]byte
-var initCmd = []byte{
-	0xEF, 3, 0x03, 0x80, 0x02,
-	0xCF, 3, 0x00, 0xC1, 0x30,
-	0xED, 4, 0x64, 0x03, 0x12, 0x81,
-	0xE8, 3, 0x85, 0x00, 0x78,
-	0xCB, 5, 0x39, 0x2C, 0x00, 0x34, 0x02,
-	0xF7, 1, 0x20,
-	0xEA, 2, 0x00, 0x00,
-	PWCTR1, 1, 0x23, // Power control VRH[5:0]
-	PWCTR2, 1, 0x10, // Power control SAP[2:0];BT[3:0]
-	VMCTR1, 2, 0x3e, 0x28, // VCM control
-	VMCTR2, 1, 0x86, // VCM control2
-	MADCTL, 1, 0x48, // Memory Access Control
-	VSCRSADD, 1, 0x00, // Vertical scroll zero
-	PIXFMT, 1, 0x55,
-	FRMCTR1, 2, 0x00, 0x18,
-	DFUNCTR, 3, 0x08, 0x82, 0x27, // Display Function Control
-	0xF2, 1, 0x00, // 3Gamma Function Disable
-	GAMMASET, 1, 0x01, // Gamma curve selected
-	GMCTRP1, 15, 0x0F, 0x31, 0x2B, 0x0C, 0x0E, 0x08, // Set Gamma
-	0x4E, 0xF1, 0x37, 0x07, 0x10, 0x03, 0x0E, 0x09, 0x00,
-	GMCTRN1, 15, 0x00, 0x0E, 0x14, 0x03, 0x11, 0x07, // Set Gamma
-	0x31, 0xC1, 0x48, 0x08, 0x0F, 0x0C, 0x31, 0x36, 0x0F,
-	SLPOUT, 0x80, // Exit Sleep
-	DISPON, 0x80, // Display on
-	0x00, // End of list
-}
-
 // Configure prepares display for use
 func (d *Device) Configure(config Config) {

@@ -109,6 +80,33 @@ func (d *Device) Configure(config Config) {
 		delay(150)
 	}

+	initCmd := []byte{
+		0xEF, 3, 0x03, 0x80, 0x02,
+		0xCF, 3, 0x00, 0xC1, 0x30,
+		0xED, 4, 0x64, 0x03, 0x12, 0x81,
+		0xE8, 3, 0x85, 0x00, 0x78,
+		0xCB, 5, 0x39, 0x2C, 0x00, 0x34, 0x02,
+		0xF7, 1, 0x20,
+		0xEA, 2, 0x00, 0x00,
+		PWCTR1, 1, 0x23, // Power control VRH[5:0]
+		PWCTR2, 1, 0x10, // Power control SAP[2:0];BT[3:0]
+		VMCTR1, 2, 0x3e, 0x28, // VCM control
+		VMCTR2, 1, 0x86, // VCM control2
+		MADCTL, 1, 0x48, // Memory Access Control
+		VSCRSADD, 1, 0x00, // Vertical scroll zero
+		PIXFMT, 1, 0x55,
+		FRMCTR1, 2, 0x00, 0x18,
+		DFUNCTR, 3, 0x08, 0x82, 0x27, // Display Function Control
+		0xF2, 1, 0x00, // 3Gamma Function Disable
+		GAMMASET, 1, 0x01, // Gamma curve selected
+		GMCTRP1, 15, 0x0F, 0x31, 0x2B, 0x0C, 0x0E, 0x08, // Set Gamma
+		0x4E, 0xF1, 0x37, 0x07, 0x10, 0x03, 0x0E, 0x09, 0x00,
+		GMCTRN1, 15, 0x00, 0x0E, 0x14, 0x03, 0x11, 0x07, // Set Gamma
+		0x31, 0xC1, 0x48, 0x08, 0x0F, 0x0C, 0x31, 0x36, 0x0F,
+		SLPOUT, 0x80, // Exit Sleep
+		DISPON, 0x80, // Display on
+		0x00, // End of list
+	}
 	for i, c := 0, len(initCmd); i < c; {
 		cmd := initCmd[i]
 		if cmd == 0x00 {
@@ -148,24 +146,8 @@ func (d *Device) Display() error {
 	return nil
 }

-var err1 = errors.New("rectangle coordinates outside display area")
-
 // DrawRGBBitmap copies an RGB bitmap to the internal buffer at given coordinates
 func (d *Device) DrawRGBBitmap(x, y int16, data []uint16, w, h int16) error {
-	k, i := d.Size()
-	if x < 0 || y < 0 || w <= 0 || h <= 0 ||
-		x >= k || (x+w) > k || y >= i || (y+h) > i {
-		return err1
-	}
-	d.setWindow(x, y, w, h)
-	d.startWrite()
-	d.driver.write16sl(data)
-	d.endWrite()
-	return nil
-}
-
-// DrawRGBBitmap8 copies an RGB bitmap to the internal buffer at given coordinates
-func (d *Device) DrawRGBBitmap8(x, y int16, data []uint8, w, h int16) error {
 	k, i := d.Size()
 	if x < 0 || y < 0 || w <= 0 || h <= 0 ||
 		x >= k || (x+w) > k || y >= i || (y+h) > i {
@@ -173,7 +155,7 @@ func (d *Device) DrawRGBBitmap8(x, y int16, data []uint8, w, h int16) error {
 	}
 	d.setWindow(x, y, w, h)
 	d.startWrite()
-	d.driver.write8sl(data)
+	d.driver.write16sl(data)
 	d.endWrite()
 	return nil
 }
@@ -253,8 +235,7 @@ func (d *Device) SetRotation(rotation Rotation) {
 	case 3:
 		madctl = MADCTL_MX | MADCTL_MY | MADCTL_MV | MADCTL_BGR
 	}
-	cmdBuf[0] = madctl
-	d.sendCommand(MADCTL, cmdBuf[:1])
+	d.sendCommand(MADCTL, []uint8{madctl})
 	d.rotation = rotation
 }

@@ -285,14 +266,16 @@ func (d *Device) setWindow(x, y, w, h int16) {
 	//y += d.rowOffset
 	x1 := x + w - 1
 	if x != d.x0 || x1 != d.x1 {
-		cmdBuf[0], cmdBuf[1], cmdBuf[2], cmdBuf[3] = uint8(x>>8), uint8(x), uint8(x1>>8), uint8(x1)
-		d.sendCommand(CASET, cmdBuf[:4])
+		d.sendCommand(CASET, []uint8{
+			uint8(x >> 8), uint8(x), uint8(x1 >> 8), uint8(x1),
+		})
 		d.x0, d.x1 = x, x1
 	}
 	y1 := y + h - 1
 	if y != d.y0 || y1 != d.y1 {
-		cmdBuf[0], cmdBuf[1], cmdBuf[2], cmdBuf[3] = uint8(y>>8), uint8(y), uint8(y1>>8), uint8(y1)
-		d.sendCommand(PASET, cmdBuf[:4])
+		d.sendCommand(PASET, []uint8{
+			uint8(y >> 8), uint8(y), uint8(y1 >> 8), uint8(y1),
+		})
 		d.y0, d.y1 = y, y1
 	}
 	d.sendCommand(RAMWR, nil)
@@ -317,9 +300,7 @@ func (d *Device) sendCommand(cmd byte, data []byte) {
 	d.dc.Low()
 	d.driver.write8(cmd)
 	d.dc.High()
-	if data != nil {
-		d.driver.write8sl(data)
-	}
+	d.driver.write8sl(data)
 	d.endWrite()
 }

@@ -1,128 +0,0 @@
-// +build !atsamd51,!atsamd21
-
-package ili9341
-
-import (
-	"device/sam"
-	"machine"
-	"unsafe"
-
-	dma "github.com/sago35/tinygo-dma"
-)
-
-var (
-	dbg5 = machine.D5
-	dbg6 = machine.D6
-)
-
-func init() {
-	dbg5.Configure(machine.PinConfig{Mode: machine.PinOutput})
-	dbg6.Configure(machine.PinConfig{Mode: machine.PinOutput})
-}
-
-var buf [64]byte
-
-type spiDriver struct {
-	bus machine.SPI
-}
-
-var (
-	dmatx *dma.DMA
-	desc  *dma.DMADescriptor
-)
-
-func NewSPI(bus machine.SPI, dc, cs, rst machine.Pin) *Device {
-	from := make([]byte, 256)
-	for i := range from {
-		from[i] = byte(i)
-	}
-
-	dmatx = dma.NewDMA(func(d *dma.DMA) {
-		d.Wait()
-		return
-	})
-	dmatx.SetTrigger(dma.DMAC_CHANNEL_CHCTRLA_TRIGSRC_SERCOM1_TX)
-	dmatx.SetTriggerAction(sam.DMAC_CHANNEL_CHCTRLA_TRIGACT_BURST)
-	desc = dmatx.GetDescriptor()
-
-	return &Device{
-		dc:  dc,
-		cs:  cs,
-		rst: rst,
-		rd:  machine.NoPin,
-		driver: &spiDriver{
-			bus: bus,
-		},
-	}
-}
-
-func (pd *spiDriver) configure(config *Config) {
-}
-
-func (pd *spiDriver) write8(b byte) {
-	buf[0] = b
-	pd.bus.Tx(buf[:1], nil)
-}
-
-func (pd *spiDriver) write8n(b byte, n int) {
-	buf[0] = b
-	for i := 0; i < n; i++ {
-		pd.bus.Tx(buf[:1], nil)
-	}
-}
-
-func (pd *spiDriver) write8sl(b []byte) {
-	if len(b) > 64 {
-		desc.UpdateDescriptor(dma.DescriptorConfig{
-			SRC:      unsafe.Pointer(&b[0]),
-			DST:      unsafe.Pointer(&pd.bus.Bus.DATA.Reg),
-			SRCINC:   dma.DMAC_SRAM_BTCTRL_SRCINC_ENABLE,
-			DSTINC:   dma.DMAC_SRAM_BTCTRL_DSTINC_DISABLE,
-			SIZE:     uint32(len(b)), // Total size of DMA transfer
-			BLOCKACT: 1,
-		})
-		dmatx.Start()
-		return
-	}
-
-	pd.bus.Tx(b, nil)
-}
-
-func (pd *spiDriver) write16(data uint16) {
-	buf[0] = uint8(data >> 8)
-	buf[1] = uint8(data)
-	pd.bus.Tx(buf[:2], nil)
-}
-
-func (pd *spiDriver) write16n(data uint16, n int) {
-	for i := 0; i < len(buf); i += 2 {
-		buf[i] = uint8(data >> 8)
-		buf[i+1] = uint8(data)
-	}
-
-	for i := 0; i < (n >> 5); i++ {
-		pd.bus.Tx(buf[:], nil)
-	}
-
-	pd.bus.Tx(buf[:n%64], nil)
-}
-
-func (pd *spiDriver) write16sl(data []uint16) {
-	if len(data) > 64 {
-		desc.UpdateDescriptor(dma.DescriptorConfig{
-			SRC:      unsafe.Pointer(&data[0]),
-			DST:      unsafe.Pointer(&pd.bus.Bus.DATA.Reg),
-			SRCINC:   dma.DMAC_SRAM_BTCTRL_SRCINC_ENABLE,
-			DSTINC:   dma.DMAC_SRAM_BTCTRL_DSTINC_DISABLE,
-			SIZE:     uint32(len(data) * 2), // Total size of DMA transfer
-			BLOCKACT: 1,
-		})
-		dmatx.Start()
-		return
-	}
-	for i, c := 0, len(data); i < c; i++ {
-		buf[0] = uint8(data[i] >> 8)
-		buf[1] = uint8(data[i])
-		pd.bus.Tx(buf[:2], nil)
-	}
-}
@@ -1,112 +0,0 @@
-package ina260
-
-import "tinygo.org/x/drivers"
-
-// Device wraps an I2C connection to an INA260 device.
-type Device struct {
-	bus     drivers.I2C
-	Address uint16
-}
-
-// Config holds the configuration of the INA260 device.
-type Config struct {
-	// One of AVGMODE_XXX
-	AverageMode byte
-
-	// One of CONVTIME_XXXXUSEC
-	VoltConvTime byte
-
-	// One of CONVTIME_XXXXUSEC
-	CurrentConvTime byte
-
-	// Multiple of MODE_XXXX
-	Mode byte
-}
-
-// New creates a new INA260 connection. The I2C bus must already be
-// configured.
-//
-// This function only creates the Device object, it does not touch the device.
-func New(bus drivers.I2C) Device {
-	return Device{
-		bus:     bus,
-		Address: Address,
-	}
-}
-
-// Configure sets up the device.
-//
-// This only needs to be called to override built-in defaults. By default,
-// the device starts with:
-//
-// * AverageMode = AVGMODE_1
-// * VoltConvTime = CONVTIME_1100USEC
-// * CurrentConvTime = CONVTIME_1100USEC
-// * Mode = MODE_CONTINUOUS | MODE_VOLTAGE | MODE_CURRENT
-//
-func (d *Device) Configure(cfg Config) {
-	var val uint16
-
-	val = uint16(cfg.AverageMode&0x7) << 9
-	val |= uint16(cfg.VoltConvTime&0x7) << 6
-	val |= uint16(cfg.CurrentConvTime&0x7) << 3
-	val |= uint16(cfg.Mode & 0x7)
-
-	d.WriteRegister(REG_CONFIG, val)
-}
-
-// Resets the device, setting all registers to default values
-func (d *Device) Reset() {
-	d.WriteRegister(REG_CONFIG, 0x8000)
-}
-
-// Connected returns whether an INA260 has been found.
-func (d *Device) Connected() bool {
-	return d.ReadRegister(REG_MANF_ID) == MANF_ID &&
-		(d.ReadRegister(REG_DIE_ID)&DEVICE_ID_MASK) == DEVICE_ID
-}
-
-// Gets the measured current in µA (max resolution 1.25mA)
-func (d *Device) Current() int32 {
-	val := d.ReadRegister(REG_CURRENT)
-
-	if val&0x8000 == 0 {
-		return int32(val) * 1250
-	}
-
-	// Two's complement, convert to signed int
-	return -(int32(^val) + 1) * 1250
-}
-
-// Gets the measured voltage in µV (max resolution 1.25mV)
-func (d *Device) Voltage() int32 {
-	val := d.ReadRegister(REG_BUSVOLTAGE)
-
-	if val&0x8000 == 0 {
-		return int32(val) * 1250
-	}
-
-	// Two's complement, convert to signed int
-	return -(int32(^val) + 1) * 1250
-}
-
-// Gets the measured power in µW (max resolution 10mW)
-func (d *Device) Power() int32 {
-	return int32(d.ReadRegister(REG_POWER)) * 10000
-}
-
-// Read a register
-func (d *Device) ReadRegister(reg uint8) uint16 {
-	data := []byte{0, 0}
-	d.bus.ReadRegister(uint8(d.Address), reg, data)
-	return (uint16(data[0]) << 8) | uint16(data[1])
-}
-
-// Write to a register
-func (d *Device) WriteRegister(reg uint8, v uint16) {
-	data := []byte{0, 0}
-	data[0] = byte(v >> 8)
-	data[1] = byte(v & 0xff)
-
-	d.bus.WriteRegister(uint8(d.Address), reg, data)
-}
@@ -1,80 +0,0 @@
-package ina260
-
-import (
-	"testing"
-
-	qt "github.com/frankban/quicktest"
-	"tinygo.org/x/drivers/tester"
-)
-
-func TestDefaultI2CAddress(t *testing.T) {
-	c := qt.New(t)
-	bus := tester.NewI2CBus(c)
-	dev := New(bus)
-	c.Assert(dev.Address, qt.Equals, uint16(Address))
-}
-
-func TestConnected(t *testing.T) {
-	c := qt.New(t)
-	bus := tester.NewI2CBus(c)
-	fake := tester.NewI2CDevice16(c, Address)
-	fake.Registers = defaultRegisters()
-	bus.AddDevice(fake)
-
-	dev := New(bus)
-	c.Assert(dev.Connected(), qt.Equals, true)
-}
-
-func TestVoltage(t *testing.T) {
-	c := qt.New(t)
-	bus := tester.NewI2CBus(c)
-	fake := tester.NewI2CDevice16(c, Address)
-	fake.Registers = defaultRegisters()
-	fake.Registers[REG_BUSVOLTAGE] = 0x2570
-	bus.AddDevice(fake)
-
-	dev := New(bus)
-	// Datasheet: 2570h = 11.98V = 11980mV = 11980000uV
-	c.Assert(dev.Voltage(), qt.Equals, int32(11980000))
-}
-
-func TestCurrent(t *testing.T) {
-	c := qt.New(t)
-	bus := tester.NewI2CBus(c)
-	fake := tester.NewI2CDevice16(c, Address)
-	fake.Registers = defaultRegisters()
-	fake.Registers[REG_CURRENT] = 0x2710
-	bus.AddDevice(fake)
-
-	dev := New(bus)
-	// Datasheet: 2710h = 12.5A = 12500mA = 12500000uA
-	c.Assert(dev.Current(), qt.Equals, int32(12500000))
-}
-
-func TestPower(t *testing.T) {
-	c := qt.New(t)
-	bus := tester.NewI2CBus(c)
-	fake := tester.NewI2CDevice16(c, Address)
-	fake.Registers = defaultRegisters()
-	fake.Registers[REG_POWER] = 0x3A7F
-	bus.AddDevice(fake)
-
-	dev := New(bus)
-	// 3A7Fh = 149.75W = 149750mW = 149750000uW
-	c.Assert(dev.Power(), qt.Equals, int32(149750000))
-}
-
-// defaultRegisters returns the default values for all of the device's registers.
-// set TI INA260 datasheet for power-on defaults
-func defaultRegisters() map[uint8]uint16 {
-	return map[uint8]uint16{
-		REG_CONFIG:     0x6127,
-		REG_CURRENT:    0x0000,
-		REG_BUSVOLTAGE: 0x0000,
-		REG_POWER:      0x0000,
-		REG_MASKENABLE: 0x0000,
-		REG_ALERTLIMIT: 0x0000,
-		REG_MANF_ID:    0x5449,
-		REG_DIE_ID:     0x2270,
-	}
-}
@@ -1,50 +0,0 @@
-package ina260
-
-// The default I2C address for this device.
-//
-// The actual address is configurable by connecting address pins.
-const Address = 0x40
-
-// Registers
-const (
-	REG_CONFIG     = 0x00
-	REG_CURRENT    = 0x01
-	REG_BUSVOLTAGE = 0x02
-	REG_POWER      = 0x03
-	REG_MASKENABLE = 0x06
-	REG_ALERTLIMIT = 0x07
-	REG_MANF_ID    = 0xFE
-	REG_DIE_ID     = 0xFF
-)
-
-// Well-Known Values
-const (
-	MANF_ID        = 0x5449 // TI
-	DEVICE_ID      = 0x2270 // 227h
-	DEVICE_ID_MASK = 0xFFF0
-
-	AVGMODE_1    = 0
-	AVGMODE_4    = 1
-	AVGMODE_16   = 2
-	AVGMODE_64   = 3
-	AVGMODE_128  = 4
-	AVGMODE_256  = 5
-	AVGMODE_512  = 6
-	AVGMODE_1024 = 7
-
-	CONVTIME_140USEC  = 0
-	CONVTIME_204USEC  = 1
-	CONVTIME_332USEC  = 2
-	CONVTIME_588USEC  = 3
-	CONVTIME_1100USEC = 4 // 1.1 ms
-	CONVTIME_2116USEC = 5 // 2.1 ms
-	CONVTIME_4156USEC = 6 // 4.2 ms
-	CONVTIME_8244USEC = 7 // 8.2 ms
-
-	MODE_CONTINUOUS = 0x4
-	MODE_TRIGGERED  = 0x0
-	MODE_VOLTAGE    = 0x2
-	MODE_NO_VOLTAGE = 0x0
-	MODE_CURRENT    = 0x1
-	MODE_NO_CURRENT = 0x0
-)
@@ -1,107 +0,0 @@
-package keypad4x4
-
-import (
-	"machine"
-)
-
-// NoKeyPressed is used, when no key was pressed
-const NoKeyPressed = 255
-
-// Device is used as 4x4 keypad driver
-type Device interface {
-	Configure()
-	GetKey() uint8
-	GetIndices() (int, int)
-}
-
-// device is a driver for 4x4 keypads
-type device struct {
-	inputEnabled bool
-	lastColumn   int
-	lastRow      int
-	columns      [4]machine.Pin
-	rows         [4]machine.Pin
-	mapping      [4][4]uint8
-}
-
-// takes r4 -r1 pins and c4 - c1 pins
-func NewDevice(r4, r3, r2, r1, c4, c3, c2, c1 machine.Pin) Device {
-	result := &device{}
-	result.columns = [4]machine.Pin{c4, c3, c2, c1}
-	result.rows = [4]machine.Pin{r4, r3, r2, r1}
-
-	return result
-}
-
-// Configure sets the column pins as input and the row pins as output
-func (keypad *device) Configure() {
-	inputConfig := machine.PinConfig{Mode: machine.PinInputPullup}
-	for i := range keypad.columns {
-		keypad.columns[i].Configure(inputConfig)
-	}
-
-	outputConfig := machine.PinConfig{Mode: machine.PinOutput}
-	for i := range keypad.rows {
-		keypad.rows[i].Configure(outputConfig)
-		keypad.rows[i].High()
-	}
-
-	keypad.mapping = [4][4]uint8{
-		{0, 1, 2, 3},
-		{4, 5, 6, 7},
-		{8, 9, 10, 11},
-		{12, 13, 14, 15},
-	}
-
-	keypad.inputEnabled = true
-	keypad.lastColumn = -1
-	keypad.lastRow = -1
-}
-
-// GetKey returns the code for the given key.
-// The codes start with 0 at the upper left end of the keypad and end with 15 at the lower right end of the keypad
-// Example:
-// 0	1	2	3
-// 4	5	6	7
-// 8	9	10	11
-// 12	13	14	15
-// returns 255 for no keyPressed
-func (keypad *device) GetKey() uint8 {
-	row, column := keypad.GetIndices()
-	if row == -1 && column == -1 {
-		return NoKeyPressed
-	}
-
-	return keypad.mapping[row][column]
-}
-
-// GetIndices returns the position of the pressed key
-func (keypad *device) GetIndices() (int, int) {
-	for rowIndex, rowPin := range keypad.rows {
-		rowPin.Low()
-
-		for columnIndex := range keypad.columns {
-			columnPin := keypad.columns[columnIndex]
-
-			if !columnPin.Get() && keypad.inputEnabled {
-				keypad.inputEnabled = false
-
-				keypad.lastColumn = columnIndex
-				keypad.lastRow = rowIndex
-
-				return keypad.lastRow, keypad.lastColumn
-			}
-
-			if columnPin.Get() &&
-				columnIndex == keypad.lastColumn &&
-				rowIndex == keypad.lastRow &&
-				!keypad.inputEnabled {
-				keypad.inputEnabled = true
-			}
-		}
-
-		rowPin.High()
-	}
-
-	return -1, -1
-}
@@ -56,71 +56,49 @@ func (d *Device) Stop() {
 	d.en.Low()
 }

-// PWM is the interface necessary for controlling the motor driver.
-type PWM interface {
-	Configure(config machine.PWMConfig) error
-	Channel(pin machine.Pin) (channel uint8, err error)
-	Top() uint32
-	Set(channel uint8, value uint32)
-	SetPeriod(period uint64) error
-}
-
 // PWMDevice is a motor with speed control.
 // a1 and a2 are the directional GPIO pins.
 // en is the PWM pin that controls the motor speed.
 type PWMDevice struct {
 	a1, a2 machine.Pin
-	spc    uint8
-	pwm    PWM
+	en     machine.PWM
 }

-// NewWithSpeed returns a new PWMMotor driver that uses an already configured PWM channel
-// to control speed.
-func NewWithSpeed(direction1, direction2 machine.Pin, spc uint8, pwm PWM) PWMDevice {
+// NewWithSpeed returns a new PWMMotor driver that uses a PWM pin to control speed.
+func NewWithSpeed(direction1, direction2 machine.Pin, speedPin machine.PWM) PWMDevice {
 	return PWMDevice{
-		a1:  direction1,
-		a2:  direction2,
-		spc: spc,
-		pwm: pwm,
+		a1: direction1,
+		a2: direction2,
+		en: speedPin,
 	}
 }

-// Configure configures the PWMDevice. Note that the PWM interface and
-// channel must already be configured, this function will not do it for you.
-func (d *PWMDevice) Configure() error {
+// Configure configures the PWMDevice.
+func (d *PWMDevice) Configure() {
 	d.a1.Configure(machine.PinConfig{Mode: machine.PinOutput})
 	d.a2.Configure(machine.PinConfig{Mode: machine.PinOutput})
+	d.en.Configure()

 	d.Stop()
-
-	return nil
 }

-// Forward turns motor on in forward direction at specific speed as a percentage.
-func (d *PWMDevice) Forward(speed uint32) {
-	if speed > 100 {
-		speed = 100
-	}
-
+// Forward turns motor on in forward direction at specific speed.
+func (d *PWMDevice) Forward(speed uint16) {
 	d.a1.High()
 	d.a2.Low()
-	d.pwm.Set(d.spc, d.pwm.Top()*speed/100)
+	d.en.Set(speed)
 }

-// Backward turns motor on in backward direction at specific speed as a percentage.
-func (d *PWMDevice) Backward(speed uint32) {
-	if speed > 100 {
-		speed = 100
-	}
-
+// Backward turns motor on in backward direction at specific speed.
+func (d *PWMDevice) Backward(speed uint16) {
 	d.a1.Low()
 	d.a2.High()
-	d.pwm.Set(d.spc, d.pwm.Top()*speed/100)
+	d.en.Set(speed)
 }

 // Stop turns motor off.
 func (d *PWMDevice) Stop() {
 	d.a1.Low()
 	d.a2.Low()
-	d.pwm.Set(d.spc, 0)
+	d.en.Set(0)
 }
@@ -49,52 +49,42 @@ func (d *Device) Stop() {
 	d.ib.Low()
 }

-// PWM is the interface necessary for controlling the motor driver.
-type PWM interface {
-	Configure(config machine.PWMConfig) error
-	Channel(pin machine.Pin) (channel uint8, err error)
-	Top() uint32
-	Set(channel uint8, value uint32)
-	SetPeriod(period uint64) error
-}
-
 // PWMDevice is a motor with speed control.
 // ia and ib are the directional/speed PWM pins.
 type PWMDevice struct {
-	pwm    PWM
-	ca, cb uint8
+	ia, ib machine.PWM
 }

 // NewWithSpeed returns a new PWMMotor driver that uses 2 PWM pins to control both direction and speed.
-func NewWithSpeed(ca, cb uint8, pwm PWM) PWMDevice {
+func NewWithSpeed(direction1, direction2 machine.PWM) PWMDevice {
 	return PWMDevice{
-		pwm: pwm,
-		ca:  ca,
-		cb:  cb,
+		ia: direction1,
+		ib: direction2,
 	}
 }

-// Configure configures the PWMDevice. Note that the pins, PWM interface,
-// and channels must all already be configured.
-func (d *PWMDevice) Configure() (err error) {
+// Configure configures the PWMDevice.
+func (d *PWMDevice) Configure() {
+	d.ia.Configure()
+	d.ib.Configure()
+
 	d.Stop()
-	return
 }

-// Forward turns motor on in forward direction at specific speed as a percentage.
-func (d *PWMDevice) Forward(speed uint32) {
-	d.pwm.Set(d.ca, d.pwm.Top()*speed/100)
-	d.pwm.Set(d.cb, 0)
+// Forward turns motor on in forward direction at specific speed.
+func (d *PWMDevice) Forward(speed uint16) {
+	d.ia.Set(speed)
+	d.ib.Set(0)
 }

-// Backward turns motor on in backward direction at specific speed as a percentage.
-func (d *PWMDevice) Backward(speed uint32) {
-	d.pwm.Set(d.ca, 0)
-	d.pwm.Set(d.cb, d.pwm.Top()*speed/100)
+// Backward turns motor on in backward direction at specific speed.
+func (d *PWMDevice) Backward(speed uint16) {
+	d.ia.Set(0)
+	d.ib.Set(speed)
 }

 // Stop turns motor off.
 func (d *PWMDevice) Stop() {
-	d.pwm.Set(d.ca, 0)
-	d.pwm.Set(d.cb, 0)
+	d.ia.Set(0)
+	d.ib.Set(0)
 }
@@ -18,13 +18,13 @@ func TestWhoAmI(t *testing.T) {
 	c := qt.New(t)
 	bus := tester.NewI2CBus(c)
 	fake := tester.NewI2CDevice(c, ADDRESS)
-	copy(fake.Registers[:], defaultRegisters())
+	fake.SetupRegisters(defaultRegisters())
 	bus.AddDevice(fake)

 	dev := New(bus)
 	c.Assert(dev.Connected(), qt.Equals, true)

-	fake.Registers[WHO_AM_I] = 0x99
+	fake.SetupRegister(WHO_AM_I, 0x99)
 	c.Assert(dev.Connected(), qt.Equals, false)
 }

@@ -1,85 +0,0 @@
-// Driver works for max7219 and 7221
-// Datasheet: https://datasheets.maximintegrated.com/en/ds/MAX7219-MAX7221.pdf
-package max72xx
-
-import (
-	"machine"
-)
-
-type Device struct {
-	bus machine.SPI
-	cs  machine.Pin
-}
-
-// NewDriver creates a new max7219 connection. The SPI wire must already be configured
-// The SPI frequency must not be higher than 10MHz.
-// parameter cs: the datasheet also refers to this pin as "load" pin.
-func NewDevice(bus machine.SPI, cs machine.Pin) *Device {
-	return &Device{
-		bus: bus,
-		cs:  cs,
-	}
-}
-
-// Configure setups the pins.
-func (driver *Device) Configure() {
-	outPutConfig := machine.PinConfig{Mode: machine.PinOutput}
-
-	driver.cs.Configure(outPutConfig)
-}
-
-// SetScanLimit sets the scan limit. Maximum is 8.
-// Example: a 4 digit 7SegmentDisplay has a scan limit of 4
-func (driver *Device) SetScanLimit(digitNumber uint8) {
-	driver.WriteCommand(byte(REG_SCANLIMIT), byte(digitNumber-1))
-}
-
-// SetDecodeMode sets the decode mode for 7 segment displays.
-// digitNumber = 1 -> 1 digit gets decoded
-// digitNumber = 2 or 3, or 4 -> 4 digit are being decoded
-// digitNumber = 8 -> 8 digits are being decoded
-// digitNumber 0 || digitNumber > 8 -> no decoding is being used
-func (driver *Device) SetDecodeMode(digitNumber uint8) {
-	switch digitNumber {
-	case 1: // only decode first digit
-		driver.WriteCommand(REG_DECODE_MODE, 0x01)
-	case 2, 3, 4: //  decode digits 3-0
-		driver.WriteCommand(REG_DECODE_MODE, 0x0F)
-	case 8: // decode 8 digits
-		driver.WriteCommand(REG_DECODE_MODE, 0xFF)
-	default:
-		driver.WriteCommand(REG_DECODE_MODE, 0x00)
-	}
-}
-
-// StartShutdownMode sets the IC into a low power shutdown mode.
-func (driver *Device) StartShutdownMode() {
-	driver.WriteCommand(REG_SHUTDOWN, 0x00)
-}
-
-// StartShutdownMode sets the IC into normal operation mode.
-func (driver *Device) StopShutdownMode() {
-	driver.WriteCommand(REG_SHUTDOWN, 0x01)
-}
-
-// StartDisplayTest starts a display test.
-func (driver *Device) StartDisplayTest() {
-	driver.WriteCommand(REG_DISPLAY_TEST, 0x01)
-}
-
-// StopDisplayTest stops the display test and gets into normal operation mode.
-func (driver *Device) StopDisplayTest() {
-	driver.WriteCommand(REG_DISPLAY_TEST, 0x00)
-}
-
-func (driver *Device) writeByte(data byte) {
-	driver.bus.Transfer(data)
-}
-
-// WriteCommand write data to a given register.
-func (driver *Device) WriteCommand(register, data byte) {
-	driver.cs.Low()
-	driver.writeByte(register)
-	driver.writeByte(data)
-	driver.cs.High()
-}
@@ -1,18 +0,0 @@
-package max72xx
-
-const (
-	REG_NOOP         byte = 0x00
-	REG_DIGIT0       byte = 0x01
-	REG_DIGIT1       byte = 0x02
-	REG_DIGIT2       byte = 0x03
-	REG_DIGIT3       byte = 0x04
-	REG_DIGIT4       byte = 0x05
-	REG_DIGIT5       byte = 0x06
-	REG_DIGIT6       byte = 0x07
-	REG_DIGIT7       byte = 0x08
-	REG_DECODE_MODE  byte = 0x09 // turn of for led matrix, turn on for digits
-	REG_INTENSITY    byte = 0x0A
-	REG_SCANLIMIT    byte = 0x0B
-	REG_SHUTDOWN     byte = 0x0C // turn on for no shutdown mode
-	REG_DISPLAY_TEST byte = 0x0F // turn off for no display test
-)
--- a/Show More
+++ b/Show More