85 fps @ feather-m4-can

Instead of sending the APA102 data byte by byte, it's more efficient to
send multiple bytes at once (especially when the SPI peripheral uses
DMA). This requires the apa102.Device object to be a pointer receiver to
avoid excessive heap allocations.

This commit also just happens to work around a hardware bug on the
nrf52832:
https://infocenter.nordicsemi.com/index.jsp?topic=%2Ferrata_nRF52832_Rev2%2FERR%2FnRF52832%2FRev2%2Flatest%2Fanomaly_832_58.html&anchor=anomaly_832_58

.circleci/config.yml

@@ -12,6 +12,9 @@ jobs:
       - run:
           name: "Enforce Go Formatted Code"
           command: make fmt-check
+      - run:
+          name: "Run unit tests"
+          command: make unit-test
       - run:
           name: "Run build and smoke tests"
           command: make smoke-test

.gitignore

@@ -1 +1,2 @@
 build
+.vscode/

CHANGELOG.md

@@ -1,3 +1,100 @@
+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**
+    - lis2mdl: add LIS2MDL magnetometer (#187)
+    - waveshare: add Waveshare 4.2in B/W e-paper driver (#183)
+- **enhancements**
+    - adt7410: add connection test and for that matter connection method
+    - gps
+        - add speed and heading to fix, as parsed from RMC NMEA sentence
+        - improvements and bugfixes (#186)
+    - ili9341
+        - add support for setting framerate, vsync pause, and reading scanline data.
+        - renamed NewSpi() to NewSPI() in accordance with Go naming conventions
+    - ws2812
+        - add support for ESP8266
+        - add support for ESP32
+- **bugfixes**
+    - ili9341
+        - rix setWindow bug, add CS pin for Clue compatibility. (#180)
+        - bugfix for RAMWR bug
+    - lis2mdl: turn on read mode on every read, to ensure that magnetometer data is updated
+- **core**
+    - i2c
+        - switch all i2c drivers definitions to use i2c bus interface type instead of machine package concrete type
+        - correct interface definition for I2C Tx function
+- **testing**
+    - fix smoke-test unless avr-gcc installed
+    - add very basic mock structs for testing i2c devices, based on work done by @rogpeppe
+    - improve API surface and implement one more test function in lis2mdl driver
+- **docs**
+    - replace README badge for godocs with pkgdocs
+
 0.13.0
 ---
 - **new devices**

LICENSE

@@ -1,4 +1,4 @@
-Copyright (c) 2018-2020 The TinyGo Authors. All rights reserved.
+Copyright (c) 2018-2021 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

Makefile

@@ -31,6 +31,8 @@ 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
@@ -81,18 +83,28 @@ 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
@@ -109,6 +121,10 @@ 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
@@ -119,6 +135,8 @@ smoke-test:
 	@md5sum ./build/test.hex
 	tinygo build -size short -o ./build/test.hex -target=microbit ./examples/waveshare-epd/epd2in13x/main.go
 	@md5sum ./build/test.hex
+	tinygo build -size short -o ./build/test.hex -target=microbit ./examples/waveshare-epd/epd4in2/main.go
+	@md5sum ./build/test.hex
 	tinygo build -size short -o ./build/test.hex -target=arduino-nano33 ./examples/wifinina/ntpclient/main.go
 	@md5sum ./build/test.hex
 	tinygo build -size short -o ./build/test.hex -target=arduino-nano33 ./examples/wifinina/udpstation/main.go
@@ -129,8 +147,12 @@ smoke-test:
 	@md5sum ./build/test.hex
 	tinygo build -size short -o ./build/test.hex -target=circuitplay-express ./examples/ws2812
 	@md5sum ./build/test.hex
+ifneq ($(AVR), 0)
+	tinygo build -size short -o ./build/test.hex -target=arduino   ./examples/ws2812
+	@md5sum ./build/test.hex
 	tinygo build -size short -o ./build/test.hex -target=digispark ./examples/ws2812
 	@md5sum ./build/test.hex
+endif
 	tinygo build -size short -o ./build/test.hex -target=trinket-m0 ./examples/bme280/main.go
 	@md5sum ./build/test.hex
 	tinygo build -size short -o ./build/test.hex -target=circuitplay-express ./examples/microphone/main.go
@@ -151,5 +173,39 @@ smoke-test:
 	@md5sum ./build/test.hex
 	tinygo build -size short -o ./build/test.hex -target=hifive1b ./examples/ssd1351/main.go
 	@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
 
-test: clean fmt-check smoke-test
+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
+TESTS = $(filter-out $(addsuffix /%,$(NOTESTS)),$(DRIVERS))
+
+unit-test:
+	@go test -v $(addprefix ./,$(TESTS)) 
+
+test: clean fmt-check unit-test smoke-test

README.md

@@ -1,9 +1,9 @@
 # TinyGo Drivers
 
-[![GoDoc](https://godoc.org/tinygo.org/x/drivers?status.svg)](https://godoc.org/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)
+[![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 that can be used together with [TinyGo](https://tinygo.org).
+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).
 
 ## Installing
 
@@ -52,12 +52,13 @@ func main() {
 
 ## Currently supported devices
 
-The following 51 devices are supported.
+The following 66 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 |
@@ -68,7 +69,9 @@ The following 51 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 |
@@ -78,22 +81,32 @@ The following 51 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 |
@@ -101,11 +114,13 @@ The following 51 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 |
 | [Waveshare 2.13" (B & C) e-paper display](https://www.waveshare.com/w/upload/d/d3/2.13inch-e-paper-b-Specification.pdf) | SPI |
 | [Waveshare 2.13" e-paper display](https://www.waveshare.com/w/upload/e/e6/2.13inch_e-Paper_Datasheet.pdf) | SPI |
+| [Waveshare 4.2" e-paper B/W display](https://www.waveshare.com/w/upload/6/6a/4.2inch-e-paper-specification.pdf) | SPI |
 | [WS2812 RGB LED](https://cdn-shop.adafruit.com/datasheets/WS2812.pdf) | GPIO |
 
 ## Contributing

adt7410/adt7410.go

@@ -1,8 +1,13 @@
+// Package adt7410 provides a driver for the adt7410 I2C Temperature Sensor.
+//
+// Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ADT7410.pdf
+//
 package adt7410 // import "tinygo.org/x/drivers/adt7410"
 
 import (
-	"machine"
 	"time"
+
+	"tinygo.org/x/drivers"
 )
 
 type Error uint8
@@ -21,40 +26,37 @@ func (e Error) Error() string {
 }
 
 type Device struct {
-	bus  *machine.I2C
-	buf  []byte
-	addr uint8
+	bus     drivers.I2C
+	buf     []byte
+	Address uint8
 }
 
-// New returns ADT7410 device for the provided I2C bus and address. The ADT7410
-// has a default address of 0x48 (1001000).  The last 2 bits of the address
+// New returns ADT7410 device for the provided I2C bus using default address.
+// of 0x48 (1001000).  To use multiple ADT7410 devices, the last 2 bits of the address
 // can be set using by connecting to the A1 and A0 pins to VDD or GND (for a
 // total of up to 4 devices on a I2C bus).  Also note that 10k pullups are
 // recommended for the SDA and SCL lines.
-func New(i2c *machine.I2C, addressBits uint8) *Device {
+func New(i2c drivers.I2C) *Device {
 	return &Device{
-		bus:  i2c,
-		buf:  make([]byte, 2),
-		addr: Address | (addressBits & 0x3),
+		bus:     i2c,
+		buf:     make([]byte, 2),
+		Address: Address,
 	}
 }
 
-func (dev *Device) Configure() (err error) {
-
-	// verify the chip ID
-	// TODO: According to datasheet, the check below should work; however
-	//       this does not seem to be working right, but is not exactly
-	//       necessary, so can revisit later to see if there is a bug
-	//id := dev.ReadByte(RegID) & 0xF8
-	//if id != 0xC8 {
-	//	err = ErrInvalidID
-	//}
-
+// Configure the ADT7410 device.
+func (d *Device) Configure() (err error) {
 	// reset the chip
-	dev.writeByte(RegReset, 0xFF)
+	d.writeByte(RegReset, 0xFF)
 	time.Sleep(10 * time.Millisecond)
 	return
+}
 
+// Connected returns whether sensor has been found.
+func (d *Device) Connected() bool {
+	data := []byte{0}
+	d.bus.ReadRegister(uint8(d.Address), RegID, data)
+	return data[0]&0xF8 == 0xC8
 }
 
 // ReadTemperature returns the temperature in celsius milli degrees (°C/1000)
@@ -62,13 +64,13 @@ func (d *Device) ReadTemperature() (temperature int32, err error) {
 	return (int32(d.readUint16(RegTempValueMSB)) * 1000) / 128, nil
 }
 
-// ReadTempC returns the value in the temperature value register, in Celcius
+// ReadTempC returns the value in the temperature value register, in Celsius.
 func (d *Device) ReadTempC() float32 {
 	t := d.readUint16(RegTempValueMSB)
 	return float32(int(t)) / 128.0
 }
 
-// ReadTempF returns the value in the temperature value register, in Fahrenheit
+// ReadTempF returns the value in the temperature value register, in Fahrenheit.
 func (d *Device) ReadTempF() float32 {
 	return d.ReadTempC()*1.8 + 32.0
 }
@@ -76,15 +78,15 @@ func (d *Device) ReadTempF() float32 {
 func (d *Device) writeByte(reg uint8, data byte) {
 	d.buf[0] = reg
 	d.buf[1] = data
-	d.bus.Tx(uint16(d.addr), d.buf, nil)
+	d.bus.Tx(uint16(d.Address), d.buf, nil)
 }
 
 func (d *Device) readByte(reg uint8) byte {
-	d.bus.ReadRegister(d.addr, reg, d.buf)
+	d.bus.ReadRegister(d.Address, reg, d.buf)
 	return d.buf[0]
 }
 
 func (d *Device) readUint16(reg uint8) uint16 {
-	d.bus.ReadRegister(d.addr, reg, d.buf)
+	d.bus.ReadRegister(d.Address, reg, d.buf)
 	return uint16(d.buf[0])<<8 | uint16(d.buf[1])
 }

adt7410/adt7410_test.go

@@ -0,0 +1,49 @@
+package adt7410
+
+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, uint8(Address))
+}
+
+func TestWhoAmI(t *testing.T) {
+	c := qt.New(t)
+	bus := tester.NewI2CBus(c)
+	fake := tester.NewI2CDevice(c, Address)
+	copy(fake.Registers[:], defaultRegisters())
+	bus.AddDevice(fake)
+
+	dev := New(bus)
+	c.Assert(dev.Connected(), qt.Equals, true)
+
+	fake.Registers[RegID] = 0x99
+	c.Assert(dev.Connected(), qt.Equals, false)
+}
+
+// defaultRegisters returns the default values for all of the device's registers.
+// see table 22 on page 27 of the datasheet.
+func defaultRegisters() []uint8 {
+	return []uint8{
+		RegTempValueMSB: 0,
+		RegTempValueLSB: 0,
+		RegStatus:       0,
+		RegConfig:       0,
+		RegTHIGHMsbReg:  0x20,
+		RegTHIGHLsbReg:  0,
+		RegTLOWMsbReg:   0x05,
+		RegTLOWLsbReg:   0,
+		RegTCRITMsbReg:  0x49,
+		RegTCRITLsbReg:  0x80,
+		RegTHYSTReg:     0x05,
+		RegID:           0xC8,
+		RegReset:        0,
+	}
+}

adt7410/registers.go

@@ -1,8 +1,33 @@
 package adt7410
 
+// 0x00 Temperature value most significant byte 0x00
+// 0x01 Temperature value least significant byte 0x00
+// 0x02 Status 0x00
+// 0x03 Configuration 0x00
+// 0x04 THIGH setpoint most significant byte 0x20 (64°C)
+// 0x05 THIGH setpoint least significant byte 0x00 (64°C)
+// 0x06 TLOW setpoint most significant byte 0x05 (10°C)
+// 0x07 TLOW setpoint least significant byte 0x00 (10°C)
+// 0x08 TCRIT setpoint most significant byte 0x49 (147°C)
+// 0x09 TCRIT setpoint least significant byte 0x80 (147°C)
+// 0x0A THYST setpoint 0x05 (5°C)
+// 0x0B ID 0xCX
+// 0x0C Reserved 0xXX
+// 0x0D Reserved 0xXX
+// 0x2E Reserved 0xXX
+// 0x2F Software reset 0xXX
+
 const (
-	// Default I2C address
+	// Address is default I2C address.
 	Address = 0x48
+	// Address1 is for first device, aka the default.
+	Address1 = Address
+	// Address2 is for second device.
+	Address2 = 0x49
+	// Address3 is for third device.
+	Address3 = 0x4A
+	// Address4 is for fourth device.
+	Address4 = 0x4B
 
 	// Temperature Value MSB Register
 	RegTempValueMSB = 0x0
@@ -16,7 +41,28 @@ const (
 	// Config Register
 	RegConfig = 0x3
 
-	// ID Register
+	// THIGH setpoint most significant byte 0x20 (64°C)
+	RegTHIGHMsbReg = 0x4
+
+	// THIGH setpoint least significant byte 0x00 (64°C)
+	RegTHIGHLsbReg = 0x5
+
+	// TLOW setpoint most significant byte 0x05 (10°C)
+	RegTLOWMsbReg = 0x6
+
+	// TLOW setpoint least significant byte 0x00 (10°C)
+	RegTLOWLsbReg = 0x7
+
+	// TCRIT setpoint most significant byte 0x49 (147°C)
+	RegTCRITMsbReg = 0x8
+
+	// TCRIT setpoint least significant byte 0x80 (147°C)
+	RegTCRITLsbReg = 0x9
+
+	// THYST setpoint 0x05 (5°C)
+	RegTHYSTReg = 0xA
+
+	// ID Register (0xCx)
 	RegID = 0x0B
 
 	// Software Reset Register

adxl345/adxl345.go

@@ -6,9 +6,7 @@
 //
 package adxl345 // import "tinygo.org/x/drivers/adxl345"
 
-import (
-	"machine"
-)
+import "tinygo.org/x/drivers"
 
 type Range uint8
 type Rate uint8
@@ -40,7 +38,7 @@ type bwRate struct {
 
 // Device wraps an I2C connection to a ADXL345 device.
 type Device struct {
-	bus        machine.I2C
+	bus        drivers.I2C
 	Address    uint16
 	powerCtl   powerCtl
 	dataFormat dataFormat
@@ -52,7 +50,7 @@ type Device struct {
 //
 // This function only creates the Device object, it does not init the device.
 // To do that you must call the Configure() method on the Device before using it.
-func New(bus machine.I2C) Device {
+func New(bus drivers.I2C) Device {
 	return Device{
 		bus: bus,
 		powerCtl: powerCtl{

aht20/aht20.go

@@ -0,0 +1,108 @@
+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
+}

aht20/aht20_test.go

@@ -0,0 +1,74 @@
+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},
+		},
+	}
+}

aht20/registers.go

@@ -0,0 +1,20 @@
+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")
+)

amg88xx/amg88xx.go

@@ -5,13 +5,14 @@
 package amg88xx // import "tinygo.org/x/drivers/amg88xx"
 
 import (
-	"machine"
 	"time"
+
+	"tinygo.org/x/drivers"
 )
 
 // Device wraps an I2C connection to a AMG88xx device.
 type Device struct {
-	bus             machine.I2C
+	bus             drivers.I2C
 	Address         uint16
 	data            []uint8
 	interruptMode   InterruptMode
@@ -27,7 +28,7 @@ type Config struct {
 // configured.
 //
 // This function only creates the Device object, it does not touch the device.
-func New(bus machine.I2C) Device {
+func New(bus drivers.I2C) Device {
 	return Device{
 		bus:     bus,
 		Address: AddressHigh,

apa102/apa102.go

@@ -6,6 +6,8 @@ package apa102 // import "tinygo.org/x/drivers/apa102"
 import (
 	"image/color"
 	"machine"
+
+	"tinygo.org/x/drivers"
 )
 
 const (
@@ -23,54 +25,48 @@ var startFrame = []byte{0x00, 0x00, 0x00, 0x00}
 
 // Device wraps APA102 SPI LEDs.
 type Device struct {
-	bus   SPI
+	bus   drivers.SPI
 	Order int
-}
-
-// The SPI interface specifies the minimum functionality that a bus
-// implementation needs to provide for use by the APA102 driver.  Hardware
-// SPI from the TinyGo "machine" package implements this already.
-type SPI interface {
-	Tx(w, r []byte) error
-	Transfer(b byte) (byte, error)
+	buf   [4]byte
 }
 
 // New returns a new APA102 driver. Pass in a fully configured SPI bus.
-func New(b 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.bus.Transfer(0xe0 | (c.A >> 3))
+		d.buf[0] = 0xe0 | (c.A >> 3)
 
 		// set the colors
 		switch d.Order {
 		case BRG:
-			d.bus.Transfer(c.B)
-			d.bus.Transfer(c.R)
-			d.bus.Transfer(c.G)
+			d.buf[1] = c.B
+			d.buf[2] = c.R
+			d.buf[3] = c.G
 		case GRB:
-			d.bus.Transfer(c.G)
-			d.bus.Transfer(c.R)
-			d.bus.Transfer(c.B)
+			d.buf[1] = c.G
+			d.buf[2] = c.R
+			d.buf[3] = c.B
 		case BGR:
-			d.bus.Transfer(c.B)
-			d.bus.Transfer(c.G)
-			d.bus.Transfer(c.R)
+			d.buf[1] = c.B
+			d.buf[2] = c.G
+			d.buf[3] = c.R
 		}
+		d.bus.Tx(d.buf[:], nil)
 	}
 
 	d.endFrame(len(cs))
@@ -79,7 +75,7 @@ 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)
@@ -88,14 +84,14 @@ 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)
 	}

at24cx/at24cx.go

@@ -6,13 +6,14 @@ package at24cx // import "tinygo.org/x/drivers/at24cx"
 
 import (
 	"errors"
-	"machine"
 	"time"
+
+	"tinygo.org/x/drivers"
 )
 
 // Device wraps an I2C connection to a DS3231 device.
 type Device struct {
-	bus               machine.I2C
+	bus               drivers.I2C
 	Address           uint16
 	pageSize          uint16
 	currentRAMAddress uint16
@@ -30,7 +31,7 @@ type Config struct {
 // configured.
 //
 // This function only creates the Device object, it does not touch the device.
-func New(bus machine.I2C) Device {
+func New(bus drivers.I2C) Device {
 	return Device{
 		bus:     bus,
 		Address: Address,

bh1750/bh1750.go

@@ -8,7 +8,7 @@ package bh1750 // import "tinygo.org/x/drivers/bh1750"
 import (
 	"time"
 
-	"machine"
+	"tinygo.org/x/drivers"
 )
 
 // SamplingMode is the sampling's resolution of the measurement
@@ -16,7 +16,7 @@ type SamplingMode byte
 
 // Device wraps an I2C connection to a bh1750 device.
 type Device struct {
-	bus     machine.I2C
+	bus     drivers.I2C
 	Address uint16
 	mode    SamplingMode
 }
@@ -25,7 +25,7 @@ type Device struct {
 // configured.
 //
 // This function only creates the Device object, it does not touch the device.
-func New(bus machine.I2C) Device {
+func New(bus drivers.I2C) Device {
 	return Device{
 		bus:     bus,
 		Address: Address,

blinkm/blinkm.go

@@ -1,15 +1,14 @@
 // Package blinkm implements a driver for the BlinkM I2C RGB LED.
 //
 // Datasheet: http://thingm.com/fileadmin/thingm/downloads/BlinkM_datasheet.pdf
+//
 package blinkm // import "tinygo.org/x/drivers/blinkm"
 
-import (
-	"machine"
-)
+import "tinygo.org/x/drivers"
 
 // Device wraps an I2C connection to a BlinkM device.
 type Device struct {
-	bus     machine.I2C
+	bus     drivers.I2C
 	Address uint16
 }
 
@@ -17,7 +16,7 @@ type Device struct {
 // configured.
 //
 // This function only creates the Device object, it does not touch the device.
-func New(bus machine.I2C) Device {
+func New(bus drivers.I2C) Device {
 	return Device{bus, Address}
 }
 

bme280/bme280.go

@@ -7,8 +7,9 @@
 package bme280
 
 import (
-	"machine"
 	"math"
+
+	"tinygo.org/x/drivers"
 )
 
 // calibrationCoefficients reads at startup and stores the calibration coefficients
@@ -35,7 +36,7 @@ type calibrationCoefficients struct {
 
 // Device wraps an I2C connection to a BME280 device.
 type Device struct {
-	bus                     machine.I2C
+	bus                     drivers.I2C
 	Address                 uint16
 	calibrationCoefficients calibrationCoefficients
 }
@@ -44,7 +45,7 @@ type Device struct {
 // configured.
 //
 // This function only creates the Device object, it does not touch the device.
-func New(bus machine.I2C) Device {
+func New(bus drivers.I2C) Device {
 	return Device{
 		bus:     bus,
 		Address: Address,

bmi160/bmi160.go

@@ -1,8 +1,11 @@
 package bmi160
 
-import "machine"
+import (
+	"machine"
+	"time"
 
-import "time"
+	"tinygo.org/x/drivers"
+)
 
 // DeviceSPI is the SPI interface to a BMI160 accelerometer/gyroscope. There is
 // also an I2C interface, but it is not yet supported.
@@ -10,14 +13,16 @@ type DeviceSPI struct {
 	// Chip select pin
 	CSB machine.Pin
 
+	buf [7]byte
+
 	// SPI bus (requires chip select to be usable).
-	Bus machine.SPI
+	Bus drivers.SPI
 }
 
 // NewSPI returns a new device driver. The pin and SPI interface are not
 // touched, provide a fully configured SPI object and call Configure to start
 // using this device.
-func NewSPI(csb machine.Pin, spi machine.SPI) *DeviceSPI {
+func NewSPI(csb machine.Pin, spi drivers.SPI) *DeviceSPI {
 	return &DeviceSPI{
 		CSB: csb, // chip select
 		Bus: spi,
@@ -77,7 +82,10 @@ func (d *DeviceSPI) Reset() error {
 
 // ReadTemperature returns the temperature in celsius milli degrees (°C/1000).
 func (d *DeviceSPI) ReadTemperature() (temperature int32, err error) {
-	data := []byte{0x80 | reg_TEMPERATURE_0, 0, 0}
+	data := d.buf[:3]
+	data[0] = 0x80 | reg_TEMPERATURE_0
+	data[1] = 0
+	data[2] = 0
 	d.CSB.Low()
 	err = d.Bus.Tx(data, data)
 	d.CSB.High()
@@ -110,7 +118,11 @@ 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 := []byte{0x80 | reg_ACC_XL, 0, 0, 0, 0, 0, 0}
+	data := d.buf[:7]
+	data[0] = 0x80 | reg_ACC_XL
+	for i := 1; i < len(data); i++ {
+		data[i] = 0
+	}
 	d.CSB.Low()
 	err = d.Bus.Tx(data, data)
 	d.CSB.High()
@@ -136,7 +148,11 @@ 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 := []byte{0x80 | reg_GYR_XL, 0, 0, 0, 0, 0, 0}
+	data := d.buf[:7]
+	data[0] = 0x80 | reg_GYR_XL
+	for i := 1; i < len(data); i++ {
+		data[i] = 0
+	}
 	d.CSB.Low()
 	err = d.Bus.Tx(data, data)
 	d.CSB.High()
@@ -182,7 +198,9 @@ 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 := []byte{0x80 | address, 0}
+	data := d.buf[:2]
+	data[0] = 0x80 | address
+	data[1] = 0
 	d.CSB.Low()
 	d.Bus.Tx(data, data)
 	d.CSB.High()
@@ -195,7 +213,11 @@ 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([]byte{address, data}, []byte{0, 0})
+	d.Bus.Tx(buf, buf)
 	d.CSB.High()
 }

bmp180/bmp180.go

@@ -9,7 +9,7 @@ package bmp180 // import "tinygo.org/x/drivers/bmp180"
 import (
 	"time"
 
-	"machine"
+	"tinygo.org/x/drivers"
 )
 
 // OversamplingMode is the oversampling ratio of the pressure measurement.
@@ -32,7 +32,7 @@ type calibrationCoefficients struct {
 
 // Device wraps an I2C connection to a BMP180 device.
 type Device struct {
-	bus                     machine.I2C
+	bus                     drivers.I2C
 	Address                 uint16
 	mode                    OversamplingMode
 	calibrationCoefficients calibrationCoefficients
@@ -43,7 +43,7 @@ type Device struct {
 //
 // This function only creates the Device object, it does not initialize the device.
 // You must call Configure() first in order to use the device itself.
-func New(bus machine.I2C) Device {
+func New(bus drivers.I2C) Device {
 	return Device{
 		bus:     bus,
 		Address: Address,

bmp280/bmp280.go

@@ -1,8 +1,9 @@
 package bmp280
 
 import (
-	"machine"
 	"time"
+
+	"tinygo.org/x/drivers"
 )
 
 // OversamplingMode is the oversampling ratio of the temperature or pressure measurement.
@@ -19,7 +20,7 @@ type Filter uint
 
 // Device wraps an I2C connection to a BMP280 device.
 type Device struct {
-	bus         machine.I2C
+	bus         drivers.I2C
 	Address     uint16
 	cali        calibrationCoefficients
 	Temperature Oversampling
@@ -52,7 +53,7 @@ type calibrationCoefficients struct {
 //
 // This function only creates the Device object, it does not initialize the device.
 // You must call Configure() first in order to use the device itself.
-func New(bus machine.I2C) Device {
+func New(bus drivers.I2C) Device {
 	return Device{
 		bus:     bus,
 		Address: Address,

bmp388/bmp388.go

@@ -0,0 +1,249 @@
+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})
+}

bmp388/registers.go

@@ -0,0 +1,84 @@
+// 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
+)

dht/constants.go

@@ -0,0 +1,116 @@
+// 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)
+}

dht/highfreq.go

@@ -0,0 +1,6 @@
+// +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

dht/lowfreq.go

@@ -0,0 +1,6 @@
+// +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

dht/thermometer.go

@@ -0,0 +1,218 @@
+// 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,
+	}
+}

dht/timesafethermometer.go

@@ -0,0 +1,154 @@
+// 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
+}

dht/util.go

@@ -0,0 +1,34 @@
+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)
+}

ds1307/ds1307.go

@@ -9,18 +9,18 @@ import (
 	"errors"
 	"time"
 
-	"machine"
+	"tinygo.org/x/drivers"
 )
 
 // Device wraps an I2C connection to a DS1307 device.
 type Device struct {
-	bus         machine.I2C
+	bus         drivers.I2C
 	Address     uint8
 	AddressSRAM uint8
 }
 
 // New creates a new DS1307 connection. I2C bus must be already configured.
-func New(bus machine.I2C) Device {
+func New(bus drivers.I2C) Device {
 	return Device{bus: bus,
 		Address:     uint8(I2CAddress),
 		AddressSRAM: SRAMBeginAddres,
@@ -42,8 +42,8 @@ func (d *Device) SetTime(t time.Time) error {
 	return err
 }
 
-// Time returns the time and date
-func (d *Device) Time() (time.Time, error) {
+// ReadTime returns the date and time
+func (d *Device) ReadTime() (time.Time, error) {
 	data := make([]byte, 8)
 	err := d.bus.ReadRegister(d.Address, uint8(TimeDate), data)
 	if err != nil {

ds3231/ds3231.go

@@ -5,15 +5,16 @@
 package ds3231 // import "tinygo.org/x/drivers/ds3231"
 
 import (
-	"machine"
 	"time"
+
+	"tinygo.org/x/drivers"
 )
 
 type Mode uint8
 
 // Device wraps an I2C connection to a DS3231 device.
 type Device struct {
-	bus     machine.I2C
+	bus     drivers.I2C
 	Address uint16
 }
 
@@ -21,7 +22,7 @@ type Device struct {
 // configured.
 //
 // This function only creates the Device object, it does not touch the device.
-func New(bus machine.I2C) Device {
+func New(bus drivers.I2C) Device {
 	return Device{
 		bus:     bus,
 		Address: Address,

espat/espat.go

@@ -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 machine.UART
+	bus drivers.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 machine.UART) *Device {
+func New(b drivers.UART) *Device {
 	return &Device{bus: b, response: make([]byte, 512), socketdata: make([]byte, 0, 1024)}
 }
 

examples/adt7410/main.go

@@ -9,8 +9,8 @@ import (
 )
 
 var (
-	i2c    = &machine.I2C0
-	sensor = adt7410.New(i2c, 0)
+	i2c    = machine.I2C0
+	sensor = adt7410.New(i2c)
 )
 
 func main() {

examples/aht20/main.go

@@ -0,0 +1,55 @@
+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)
+}

examples/apa102/itsybitsy-m0/main.go

@@ -13,9 +13,9 @@ import (
 )
 
 var (
-	apa apa102.Device
+	apa *apa102.Device
 
-	led   = machine.PWM{machine.LED}
+	pwm   = machine.TCC0
 	leds  = make([]color.RGBA, 1)
 	wheel = &Wheel{Brightness: 0x10}
 )
@@ -27,12 +27,19 @@ func init() {
 	apa = apa102.NewSoftwareSPI(machine.PA00, machine.PA01, 1)
 
 	// Configure the regular on-board LED for PWM fading
-	machine.InitPWM()
-	led.Configure()
-
+	err := pwm.Configure(machine.PWMConfig{})
+	if err != nil {
+		println("failed to configure PWM")
+		return
+	}
 }
 
 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
@@ -43,11 +50,11 @@ func main() {
 				brightening = !brightening
 				continue
 			}
-			var brightness uint16 = uint16(i) << 8
+			var brightness uint32 = uint32(i)
 			if !brightening {
-				brightness = 0xFFFF - brightness
+				brightness = 256 - brightness
 			}
-			led.Set(brightness)
+			pwm.Set(channelLED, pwm.Top()*brightness/256)
 			time.Sleep(5 * time.Millisecond)
 		}
 	}()

examples/bmp388/main.go

@@ -0,0 +1,53 @@
+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)
+	}
+}

examples/dht/main.go

@@ -0,0 +1,23 @@
+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)
+	}
+}

examples/ds1307/time/main.go

@@ -13,7 +13,7 @@ func main() {
 	rtc.SetTime(time.Date(2019, 5, 15, 20, 34, 12, 0, time.UTC))
 
 	for {
-		t, err := rtc.Time()
+		t, err := rtc.ReadTime()
 		if err != nil {
 			println("Error reading date:", err)
 			break

examples/espat/espconsole/main.go

@@ -30,7 +30,7 @@ var (
 	tx   = machine.PA22
 	rx   = machine.PA23
 
-	console = machine.UART0
+	console = machine.Serial
 
 	adaptor *espat.Device
 )

examples/espat/mqttclient/main.go

@@ -36,7 +36,7 @@ var (
 	tx   = machine.PA22
 	rx   = machine.PA23
 
-	console = machine.UART0
+	console = machine.Serial
 
 	adaptor *espat.Device
 	topic   = "tinygo"

examples/espat/mqttsub/main.go

@@ -37,7 +37,7 @@ var (
 	tx   = machine.PA22
 	rx   = machine.PA23
 
-	console = machine.UART0
+	console = machine.Serial
 
 	adaptor *espat.Device
 	cl      mqtt.Client

examples/flash/console/console_example.go

@@ -20,7 +20,7 @@ var (
 	input [consoleBufLen]byte
 	store [storageBufLen]byte
 
-	console = machine.UART0
+	console = machine.Serial
 
 	dev *flash.Device
 

examples/gps/i2c/main.go

@@ -1,8 +1,8 @@
 package main
 
 import (
-	"fmt"
 	"machine"
+	"time"
 
 	"tinygo.org/x/drivers/gps"
 )
@@ -10,20 +10,41 @@ import (
 func main() {
 	println("GPS I2C Example")
 	machine.I2C0.Configure(machine.I2CConfig{})
-	ublox := gps.NewI2C(&machine.I2C0)
-	parser := gps.Parser(ublox)
+	ublox := gps.NewI2C(machine.I2C0)
+	parser := gps.NewParser()
 	var fix gps.Fix
 	for {
-		fix = parser.NextFix()
+		s, err := ublox.NextSentence()
+		if err != nil {
+			println(err)
+			continue
+		}
+
+		fix, err = parser.Parse(s)
+		if err != nil {
+			println(err)
+			continue
+		}
 		if fix.Valid {
 			print(fix.Time.Format("15:04:05"))
-			print(", lat=", fmt.Sprintf("%f", fix.Latitude))
-			print(", long=", fmt.Sprintf("%f", fix.Longitude))
-			print(", altitude:=", fix.Altitude)
+			print(", lat=")
+			print(fix.Latitude)
+			print(", long=")
+			print(fix.Longitude)
+			print(", altitude=", fix.Altitude)
 			print(", satellites=", fix.Satellites)
+			if fix.Speed != 0 {
+				print(", speed=")
+				print(fix.Speed)
+			}
+			if fix.Heading != 0 {
+				print(", heading=")
+				print(fix.Heading)
+			}
 			println()
 		} else {
 			println("No fix")
 		}
+		time.Sleep(200 * time.Millisecond)
 	}
 }

examples/gps/uart/main.go

@@ -1,8 +1,8 @@
 package main
 
 import (
-	"fmt"
 	"machine"
+	"time"
 
 	"tinygo.org/x/drivers/gps"
 )
@@ -10,20 +10,41 @@ import (
 func main() {
 	println("GPS UART Example")
 	machine.UART1.Configure(machine.UARTConfig{BaudRate: 9600})
-	ublox := gps.NewUART(&machine.UART1)
-	parser := gps.Parser(ublox)
+	ublox := gps.NewUART(machine.UART1)
+	parser := gps.NewParser()
 	var fix gps.Fix
 	for {
-		fix = parser.NextFix()
+		s, err := ublox.NextSentence()
+		if err != nil {
+			println(err)
+			continue
+		}
+
+		fix, err = parser.Parse(s)
+		if err != nil {
+			println(err)
+			continue
+		}
 		if fix.Valid {
 			print(fix.Time.Format("15:04:05"))
-			print(", lat=", fmt.Sprintf("%f", fix.Latitude))
-			print(", long=", fmt.Sprintf("%f", fix.Longitude))
-			print(", altitude:=", fix.Altitude)
+			print(", lat=")
+			print(fix.Latitude)
+			print(", long=")
+			print(fix.Longitude)
+			print(", altitude=", fix.Altitude)
 			print(", satellites=", fix.Satellites)
+			if fix.Speed != 0 {
+				print(", speed=")
+				print(fix.Speed)
+			}
+			if fix.Heading != 0 {
+				print(", heading=")
+				print(fix.Heading)
+			}
 			println()
 		} else {
 			println("No fix")
 		}
+		time.Sleep(200 * time.Millisecond)
 	}
 }

examples/hcsr04/main.go

@@ -1,4 +1,4 @@
-package hcsr04
+package main
 
 import (
 	"machine"

examples/ili9341/basic/atsamd21.go

@@ -9,7 +9,7 @@ import (
 )
 
 var (
-	display = ili9341.NewSpi(
+	display = ili9341.NewSPI(
 		machine.SPI0,
 		machine.D0,
 		machine.D1,

examples/ili9341/basic/wioterminal.go

@@ -9,7 +9,7 @@ import (
 )
 
 var (
-	display = ili9341.NewSpi(
+	display = ili9341.NewSPI(
 		machine.SPI3,
 		machine.LCD_DC,
 		machine.LCD_SS_PIN,

examples/ili9341/pyportal_boing/main.go

@@ -10,6 +10,25 @@ 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
@@ -25,7 +44,12 @@ const (
 )
 
 var (
-	frameBuffer = [(graphics.BALLHEIGHT + 8) * (graphics.BALLWIDTH + 8)]uint16{}
+	dbg5 = machine.D5
+	dbg6 = machine.D6
+)
+
+var (
+	frameBuffer = [2][(BALLHEIGHT + 8) * (BALLWIDTH + 8)]uint16{}
 
 	startTime int64
 	frame     int64
@@ -71,14 +95,18 @@ 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 >= graphics.SCREENWIDTH-graphics.BALLWIDTH) {
+		if (ballx <= 15) || (ballx >= SCREENWIDTH-BALLWIDTH) {
 			ballvx *= -1 // Left/right bounce
 		}
 		if bally >= YBOTTOM { // Hit ground?
@@ -100,13 +128,13 @@ func main() {
 		if int16(balloldy) < miny {
 			miny = int16(balloldy)
 		}
-		maxx = int16(ballx + graphics.BALLWIDTH - 1)
-		if int16(balloldx+graphics.BALLWIDTH-1) > maxx {
-			maxx = int16(balloldx + graphics.BALLWIDTH - 1)
+		maxx = int16(ballx + BALLWIDTH - 1)
+		if int16(balloldx+BALLWIDTH-1) > maxx {
+			maxx = int16(balloldx + BALLWIDTH - 1)
 		}
-		maxy = int16(bally + graphics.BALLHEIGHT - 1)
-		if int16(balloldy+graphics.BALLHEIGHT-1) > maxy {
-			maxy = int16(balloldy + graphics.BALLHEIGHT - 1)
+		maxy = int16(bally + BALLHEIGHT - 1)
+		if int16(balloldy+BALLHEIGHT-1) > maxy {
+			maxy = int16(balloldy + BALLHEIGHT - 1)
 		}
 
 		width = maxx - minx + 1
@@ -120,13 +148,13 @@ 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] = WHITE
+				palette[i+2] = invWHITE
 			} else {
-				palette[i+2] = RED
+				palette[i+2] = invRED
 			} // Palette entries 0 and 1 aren't used (clear and shadow, respectively)
 		}
 
@@ -136,61 +164,100 @@ 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 bx1, bgx1 int16       // Loop counters and working vars
-		var p uint8               // 'packed' value of 2 ball pixels
-		var bufIdx int8 = 0
+		//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)
 
-		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?
+		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)
 					// Yes, do ball compositing math...
-					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
+					c = uint16(graphics.Ball[int(byBase)+x-max]) // Get packed value (2 pixels)
+
 					if c == 0 { // Outside ball - just draw grid
-						if graphics.Background[bgidx]&(0x80>>(bgx1&7)) != 0 {
-							c = GRIDCOLOR
-						} else {
-							c = BGCOLOR
-						}
+						c = graphics.Background[bgidxBase+x]
 					} else if c > 1 { // In ball area...
 						c = palette[c]
 					} else { // In shadow area...
-						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
+						c = graphics.BackgroundShadow[bgidxBase+x]
 					}
+					frameBuffer[bufIdx][yBase+x] = c
 				}
-				frameBuffer[y*int(width)+x] = c
-				bx1++ // Increment bitmap position counters (X axis)
-				bgx1++
+				bgy2++
 			}
-			//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++
 		}
 
-		display.DrawRGBBitmap(minx, miny, frameBuffer[:width*height], width, height)
+		{
+			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)
 
 		// Show approximate frame rate
 		frame++
@@ -205,21 +272,13 @@ func main() {
 
 func DrawBackground() {
 	w, h := display.Size()
-	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
-			}
+	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]
 		}
-		display.DrawRGBBitmap(0, j, frameBuffer[0:w], w, 1)
+		display.DrawRGBBitmap(0, int16(j), frameBuffer[bufIdx][0:w], w, 1)
+		time.Sleep(1 * time.Millisecond)
 	}
 }

examples/ili9341/pyportal_boing/wioterminal.go

@@ -9,7 +9,7 @@ import (
 )
 
 var (
-	display = ili9341.NewSpi(
+	display = ili9341.NewSPI(
 		machine.SPI3,
 		machine.LCD_DC,
 		machine.LCD_SS_PIN,

examples/ili9341/scroll/atsamd21.go

@@ -9,7 +9,7 @@ import (
 )
 
 var (
-	display = ili9341.NewSpi(
+	display = ili9341.NewSPI(
 		machine.SPI0,
 		machine.D0,
 		machine.D1,

examples/ili9341/scroll/wioterminal.go

@@ -9,7 +9,7 @@ import (
 )
 
 var (
-	display = ili9341.NewSpi(
+	display = ili9341.NewSPI(
 		machine.SPI3,
 		machine.LCD_DC,
 		machine.LCD_SS_PIN,

examples/ina260/main.go

@@ -0,0 +1,63 @@
+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)
+}

examples/keypad4x4/main.go

@@ -0,0 +1,38 @@
+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])
+		}
+	}
+}

examples/l293x/speed/main.go

@@ -8,19 +8,31 @@ import (
 )
 
 const (
-	maxSpeed = 30000
+	maxSpeed = 100
 )
 
 func main() {
-	machine.InitPWM()
+	err := machine.TCC0.Configure(machine.PWMConfig{
+		Period: 16384e3, // 16.384ms
+	})
+	if err != nil {
+		println(err.Error())
+		return
+	}
 
-	wheel := l293x.NewWithSpeed(machine.D10, machine.D11, machine.PWM{machine.D12})
+	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.Configure()
 
 	for i := 0; i <= 10; i++ {
 		println("Forward")
-		var i uint16
-		for i = 0; i < maxSpeed; i += 1000 {
+		var i uint32
+		for i = 0; i < maxSpeed; i += 10 {
 			wheel.Forward(i)
 			time.Sleep(time.Millisecond * 100)
 		}
@@ -30,7 +42,7 @@ func main() {
 		time.Sleep(time.Millisecond * 1000)
 
 		println("Backward")
-		for i = 0; i < maxSpeed; i += 1000 {
+		for i = 0; i < maxSpeed; i += 10 {
 			wheel.Backward(i)
 			time.Sleep(time.Millisecond * 100)
 		}

examples/l9110x/speed/main.go

@@ -8,19 +8,38 @@ import (
 )
 
 const (
-	maxSpeed = 30000
+	maxSpeed = 100
 )
 
 func main() {
-	machine.InitPWM()
+	machine.D11.Configure(machine.PinConfig{Mode: machine.PinOutput})
+	machine.D12.Configure(machine.PinConfig{Mode: machine.PinOutput})
 
-	wheel := l9110x.NewWithSpeed(machine.PWM{machine.D11}, machine.PWM{machine.D12})
+	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.Configure()
 
 	for i := 0; i <= 10; i++ {
 		println("Forward")
-		var i uint16
-		for i = 0; i < maxSpeed; i += 1000 {
+		var i uint32
+		for i = 0; i < maxSpeed; i += 10 {
 			wheel.Forward(i)
 			time.Sleep(time.Millisecond * 100)
 		}
@@ -30,7 +49,7 @@ func main() {
 		time.Sleep(time.Millisecond * 1000)
 
 		println("Backward")
-		for i = 0; i < maxSpeed; i += 1000 {
+		for i = 0; i < maxSpeed; i += 10 {
 			wheel.Backward(i)
 			time.Sleep(time.Millisecond * 100)
 		}

examples/lis2mdl/main.go

@@ -0,0 +1,29 @@
+package main
+
+import (
+	"machine"
+	"time"
+
+	"tinygo.org/x/drivers/lis2mdl"
+)
+
+func main() {
+	machine.I2C0.Configure(machine.I2CConfig{})
+	compass := lis2mdl.New(machine.I2C0)
+
+	if !compass.Connected() {
+		for {
+			println("LIS2MDL not connected!")
+			time.Sleep(1 * time.Second)
+		}
+	}
+
+	compass.Configure(lis2mdl.Configuration{}) //default settings
+
+	for {
+		heading := compass.ReadCompass()
+		println("Heading:", heading)
+
+		time.Sleep(time.Millisecond * 100)
+	}
+}

examples/max72xx/main.go

@@ -0,0 +1,135 @@
+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
+)

examples/mcp23017-multiple/main.go

@@ -0,0 +1,45 @@
+// 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)
+	}
+}

examples/mcp23017/main.go

@@ -0,0 +1,39 @@
+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)
+	}
+}

examples/mcp2515/main.go

@@ -0,0 +1,55 @@
+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)
+	}
+}

examples/p1am/main.go

@@ -0,0 +1,74 @@
+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
+}

examples/pcf8563/alarm/main.go

@@ -0,0 +1,45 @@
+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)
+		}
+	}
+}

examples/pcf8563/clkout/main.go

@@ -0,0 +1,31 @@
+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)
+	}
+}

examples/pcf8563/time/main.go

@@ -0,0 +1,36 @@
+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)
+		}
+	}
+
+}

examples/pcf8563/timer/main.go

@@ -0,0 +1,46 @@
+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)
+		}
+	}
+}

examples/sdcard/console/console.go

@@ -0,0 +1,363 @@
+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("==> ")
+}

examples/sdcard/console/feather-m4.go

@@ -0,0 +1,17 @@
+// +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
+}

examples/sdcard/console/grandcentral-m4.go

@@ -0,0 +1,17 @@
+// +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
+}

examples/sdcard/console/m0.go

@@ -0,0 +1,17 @@
+// +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
+}

examples/sdcard/console/main.go

@@ -0,0 +1,51 @@
+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)
+	}
+}

examples/sdcard/console/p1am-100.go

@@ -0,0 +1,17 @@
+// +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
+}

examples/sdcard/console/pygamer.go

@@ -0,0 +1,17 @@
+// +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
+}

examples/sdcard/console/pyportal.go

@@ -0,0 +1,17 @@
+// +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
+}

examples/sdcard/console/wioterminal.go

@@ -0,0 +1,17 @@
+// +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
+}

examples/sdcard/tinyfs/console/console.go

@@ -0,0 +1,519 @@
+// +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("==> ")
+}

examples/sdcard/tinyfs/feather-m4.go

@@ -0,0 +1,17 @@
+// +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
+}

examples/sdcard/tinyfs/grandcentral-m4.go

@@ -0,0 +1,17 @@
+// +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
+}

examples/sdcard/tinyfs/m0.go

@@ -0,0 +1,17 @@
+// +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
+}

examples/sdcard/tinyfs/main.go

@@ -0,0 +1,49 @@
+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)
+	}
+}

examples/sdcard/tinyfs/p1am-100.go

@@ -0,0 +1,17 @@
+// +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
+}

examples/sdcard/tinyfs/pygamer.go

@@ -0,0 +1,17 @@
+// +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
+}

examples/sdcard/tinyfs/pyportal.go

@@ -0,0 +1,17 @@
+// +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
+}

examples/sdcard/tinyfs/wioterminal.go

@@ -0,0 +1,17 @@
+// +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
+}

examples/servo/servo.go

@@ -0,0 +1,43 @@
+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)
+	}
+}

examples/ssd1306/i2c_128x64/main.go

@@ -0,0 +1,60 @@
+// 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)
+	}
+}

examples/ssd1331/main.go

@@ -1,4 +1,4 @@
-package ssd1331
+package main
 
 import (
 	"machine"

examples/ssd1351/main.go

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

examples/st7789/main.go

@@ -9,12 +9,37 @@ import (
 )
 
 func main() {
+
+	// Example configuration for Adafruit Clue
+	// machine.SPI1.Configure(machine.SPIConfig{
+	//	Frequency: 8000000,
+	//	SCK:       machine.TFT_SCK,
+	//	SDO:       machine.TFT_SDO,
+	//	SDI:       machine.TFT_SDO,
+	//	Mode:      0,
+	// })
+	// display := st7789.New(machine.SPI1,
+	//	machine.TFT_RESET,
+	//	machine.TFT_DC,
+	//	machine.TFT_CS,
+	//	machine.TFT_LITE)
+
 	machine.SPI0.Configure(machine.SPIConfig{
 		Frequency: 8000000,
-		Mode:      3,
+		Mode:      0,
+	})
+	display := st7789.New(machine.SPI0,
+		machine.P6, // TFT_RESET
+		machine.P7, // TFT_DC
+		machine.P8, // TFT_CS
+		machine.P9) // TFT_LITE
+
+	display.Configure(st7789.Config{
+		Rotation:   st7789.NO_ROTATION,
+		RowOffset:  80,
+		FrameRate:  st7789.FRAMERATE_111,
+		VSyncLines: st7789.MAX_VSYNC_SCANLINES,
 	})
-	display := st7789.New(machine.SPI0, machine.P6, machine.P7, machine.P8)
-	display.Configure(st7789.Config{Rotation: st7789.NO_ROTATION})
 
 	width, height := display.Size()
 

examples/tm1637/main.go

@@ -0,0 +1,40 @@
+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)
+	}
+
+}

examples/tone/tone.go

@@ -0,0 +1,33 @@
+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)
+	}
+}

examples/waveshare-epd/epd4in2/main.go

@@ -0,0 +1,56 @@
+package main
+
+import (
+	"machine"
+
+	"image/color"
+
+	"time"
+
+	"tinygo.org/x/drivers/waveshare-epd/epd4in2"
+)
+
+var display epd4in2.Device
+
+func main() {
+	machine.SPI0.Configure(machine.SPIConfig{
+		Frequency: 8000000,
+		Mode:      0,
+	})
+
+	display = epd4in2.New(machine.SPI0, machine.P6, machine.P7, machine.P8, machine.P9)
+	display.Configure(epd4in2.Config{})
+
+	black := color.RGBA{1, 1, 1, 255}
+
+	display.ClearBuffer()
+	println("Clear the display")
+	display.ClearDisplay()
+	display.WaitUntilIdle()
+	println("Waiting for 2 seconds")
+	time.Sleep(2 * time.Second)
+
+	// Show a checkered board
+	for i := int16(0); i < 16; i++ {
+		for j := int16(0); j < 25; j++ {
+			if (i+j)%2 == 0 {
+				showRect(i*8, j*10, 8, 10, black)
+			}
+		}
+	}
+	println("Show checkered board")
+	display.Display()
+	display.WaitUntilIdle()
+	println("Waiting for 2 seconds")
+	time.Sleep(2 * time.Second)
+
+	println("You could remove power now")
+}
+
+func showRect(x int16, y int16, w int16, h int16, c color.RGBA) {
+	for i := x; i < x+w; i++ {
+		for j := y; j < y+h; j++ {
+			display.SetPixel(i, j, c)
+		}
+	}
+}

examples/wifinina/connect/main.go

@@ -0,0 +1,146 @@
+// 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.")
+}

examples/wifinina/mqttclient/main.go

@@ -35,28 +35,16 @@ const server = "tcp://test.mosquitto.org:1883"
 var (
 
 	// these are the default pins for the Arduino Nano33 IoT.
-	uart = machine.UART2
-	tx   = machine.NINA_TX
-	rx   = machine.NINA_RX
-	spi  = machine.NINA_SPI
+	spi = machine.NINA_SPI
 
 	// this is the ESP chip that has the WIFININA firmware flashed on it
-	adaptor = &wifinina.Device{
-		SPI:   spi,
-		CS:    machine.NINA_CS,
-		ACK:   machine.NINA_ACK,
-		GPIO0: machine.NINA_GPIO0,
-		RESET: machine.NINA_RESETN,
-	}
-
-	console = machine.UART0
+	adaptor *wifinina.Device
 	topic   = "tinygo"
 )
 
 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
@@ -68,6 +56,11 @@ func main() {
 	})
 
 	// Init esp8266/esp32
+	adaptor = wifinina.New(spi,
+		machine.NINA_CS,
+		machine.NINA_ACK,
+		machine.NINA_GPIO0,
+		machine.NINA_RESETN)
 	adaptor.Configure()
 
 	connectToAP()
@@ -97,7 +90,7 @@ func main() {
 				println(err.Error())
 			}
 		}
-		time.Sleep(1 * time.Millisecond)
+		time.Sleep(100 * time.Millisecond)
 	}
 
 	// Right now this code is never reached. Need a way to trigger it...

examples/wifinina/mqttsub/main.go

@@ -32,23 +32,11 @@ 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.
-	uart = machine.UART2
-	tx   = machine.NINA_TX
-	rx   = machine.NINA_RX
-	spi  = machine.NINA_SPI
+	spi = machine.NINA_SPI
 
 	// this is the ESP chip that has the WIFININA firmware flashed on it
-	adaptor = &wifinina.Device{
-		SPI:   spi,
-		CS:    machine.NINA_CS,
-		ACK:   machine.NINA_ACK,
-		GPIO0: machine.NINA_GPIO0,
-		RESET: machine.NINA_RESETN,
-	}
-
-	console = machine.UART0
+	adaptor *wifinina.Device
 
 	cl      mqtt.Client
 	topicTx = "tinygo/tx"
@@ -63,7 +51,6 @@ 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
@@ -75,6 +62,11 @@ func main() {
 	})
 
 	// Init esp8266/esp32
+	adaptor = wifinina.New(spi,
+		machine.NINA_CS,
+		machine.NINA_ACK,
+		machine.NINA_GPIO0,
+		machine.NINA_RESETN)
 	adaptor.Configure()
 
 	connectToAP()

examples/wifinina/ntpclient/main.go

@@ -23,36 +23,41 @@ 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 (
 
-	// this is the ESP chip that has the WIFININA firmware flashed on it
 	// these are the default pins for the Arduino Nano33 IoT.
-	adaptor = wifinina.Device{
-		SPI:   machine.NINA_SPI,
-		CS:    machine.NINA_CS,
-		ACK:   machine.NINA_ACK,
-		GPIO0: machine.NINA_GPIO0,
-		RESET: machine.NINA_RESETN,
-	}
+	spi = machine.NINA_SPI
 
-	b = make([]byte, NTP_PACKET_SIZE)
-
-	console = machine.UART0
+	// this is the ESP chip that has the WIFININA firmware flashed on it
+	adaptor *wifinina.Device
+	b       = make([]byte, NTP_PACKET_SIZE)
 )
 
-func main() {
-
-	// Init esp32
+func setup() {
 	// Configure SPI for 8Mhz, Mode 0, MSB First
-	machine.NINA_SPI.Configure(machine.SPIConfig{
+	spi.Configure(machine.SPIConfig{
 		Frequency: 8 * 1e6,
 		SDO:       machine.NINA_SDO,
 		SDI:       machine.NINA_SDI,
 		SCK:       machine.NINA_SCK,
 	})
-	adaptor.Configure()
 
-	// connect to access point
+	adaptor = wifinina.New(spi,
+		machine.NINA_CS,
+		machine.NINA_ACK,
+		machine.NINA_GPIO0,
+		machine.NINA_RESETN)
+	adaptor.Configure()
+}
+
+func main() {
+
+	setup()
+
+	waitSerial()
+
 	connectToAP()
 
 	// now make UDP connection
@@ -83,10 +88,13 @@ func main() {
 		}
 	}
 
-	// Right now this code is never reached. Need a way to trigger it...
-	println("Disconnecting UDP...")
-	conn.Close()
-	println("Done.")
+}
+
+// Wait for user to open serial console
+func waitSerial() {
+	for !machine.Serial.DTR() {
+		time.Sleep(100 * time.Millisecond)
+	}
 }
 
 func getCurrentTime(conn *net.UDPSerialConn) (time.Time, error) {
@@ -143,6 +151,12 @@ 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)

examples/wifinina/tcpclient/main.go

@@ -29,29 +29,16 @@ const serverIP = ""
 var (
 
 	// these are the default pins for the Arduino Nano33 IoT.
-	uart = machine.UART2
-	tx   = machine.NINA_TX
-	rx   = machine.NINA_RX
-	spi  = machine.NINA_SPI
+	spi = machine.NINA_SPI
 
 	// this is the ESP chip that has the WIFININA firmware flashed on it
-	adaptor = &wifinina.Device{
-		SPI:   spi,
-		CS:    machine.NINA_CS,
-		ACK:   machine.NINA_ACK,
-		GPIO0: machine.NINA_GPIO0,
-		RESET: machine.NINA_RESETN,
-	}
-
-	console = machine.UART0
+	adaptor *wifinina.Device
 )
 
 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,
@@ -60,6 +47,11 @@ func main() {
 		SCK:       machine.NINA_SCK,
 	})
 
+	adaptor = wifinina.New(spi,
+		machine.NINA_CS,
+		machine.NINA_ACK,
+		machine.NINA_GPIO0,
+		machine.NINA_RESETN)
 	adaptor.Configure()
 
 	connectToAP()

examples/wifinina/tlsclient/main.go

@@ -0,0 +1,151 @@
+// 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")
+}

examples/wifinina/udpstation/main.go

@@ -22,19 +22,9 @@ const pass = ""
 // IP address of the server aka "hub". Replace with your own info.
 const hubIP = ""
 
-// 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 (
-
 	// this is the ESP chip that has the WIFININA firmware flashed on it
-	// these are the default pins for the Arduino Nano33 IoT.
-	adaptor = &wifinina.Device{
-		SPI:   machine.NINA_SPI,
-		CS:    machine.NINA_CS,
-		ACK:   machine.NINA_ACK,
-		GPIO0: machine.NINA_GPIO0,
-		RESET: machine.NINA_RESETN,
-	}
+	adaptor *wifinina.Device
 )
 
 func main() {
@@ -47,6 +37,14 @@ func main() {
 		SDI:       machine.NINA_SDI,
 		SCK:       machine.NINA_SCK,
 	})
+
+	// these are the default pins for the Arduino Nano33 IoT.
+	// change these to connect to a different UART or pins for the ESP8266/ESP32
+	adaptor = wifinina.New(machine.NINA_SPI,
+		machine.NINA_CS,
+		machine.NINA_ACK,
+		machine.NINA_GPIO0,
+		machine.NINA_RESETN)
 	adaptor.Configure()
 
 	// connect to access point