release: prepare for release v0.16.0

Signed-off-by: deadprogram <ron@hybridgroup.com>

.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 +173,35 @@ 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
 
-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
+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 65 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 |
@@ -78,18 +81,27 @@ 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 |
@@ -101,11 +113,13 @@ 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 (
@@ -23,20 +25,12 @@ 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)
-}
-
 // New returns a new APA102 driver. Pass in a fully configured SPI bus.
-func New(b SPI) Device {
+func New(b drivers.SPI) Device {
 	return Device{bus: b, Order: BGR}
 }
 

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.
@@ -11,13 +14,13 @@ type DeviceSPI struct {
 	CSB machine.Pin
 
 	// 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,

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

@@ -15,7 +15,7 @@ import (
 var (
 	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/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"
 )
@@ -11,19 +11,40 @@ func main() {
 	println("GPS UART Example")
 	machine.UART1.Configure(machine.UARTConfig{BaudRate: 9600})
 	ublox := gps.NewUART(&machine.UART1)
-	parser := gps.Parser(ublox)
+	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/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/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 +1,130 @@
+// This example connects to Access Point and prints some info
+package main
+
+import (
+	"encoding/binary"
+	"fmt"
+	"machine"
+	"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("---------------------------------")
+		printIPs()
+		printTime()
+		printMacAddress()
+		time.Sleep(10 * time.Second)
+	}
+
+}
+
+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 IP: ", gateway.String())
+}
+
+func printTime() {
+	print("Time: ")
+	t, err := adaptor.GetTime()
+	if err != nil {
+		println("Unknown (error: ", err.Error(), ")")
+	}
+	println(time.Unix(int64(t), 0).String())
+}
+
+func printMacAddress() {
+	print("MAC Address: ")
+	b := make([]byte, 8)
+	mac, err := adaptor.GetMACAddress()
+	if err != nil {
+		println("Unknown (", err.Error(), ")")
+	}
+	binary.LittleEndian.PutUint64(b, uint64(mac))
+	macAddress := ""
+	for i := 5; i >= 0; i-- {
+		macAddress += fmt.Sprintf("%0X", b[i])
+		if i != 0 {
+			macAddress += ":"
+		}
+	}
+	println(macAddress)
+}
+
+// Wait for user to open serial console
+func waitSerial() {
+	for !machine.UART0.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)
+	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.")
+}
+
+func message(msg string) {
+	println(msg, "\r")
+}

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.UART0.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.UART0.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

examples/wifinina/webclient/main.go

@@ -27,21 +27,10 @@ const server = "tinygo.org"
 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 [256]byte
@@ -49,10 +38,7 @@ var buf [256]byte
 var lastRequestTime time.Time
 var conn net.Conn
 
-func main() {
-
-	uart.Configure(machine.UARTConfig{TX: tx, RX: rx})
-
+func setup() {
 	// Configure SPI for 8Mhz, Mode 0, MSB First
 	spi.Configure(machine.SPIConfig{
 		Frequency: 8 * 1e6,
@@ -61,17 +47,39 @@ func main() {
 		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 {
-		loop()
+		readConnection()
+		if time.Now().Sub(lastRequestTime).Milliseconds() >= 10000 {
+			makeHTTPRequest()
+		}
 	}
-	println("Done.")
+
 }
 
-func loop() {
+// Wait for user to open serial console
+func waitSerial() {
+	for !machine.UART0.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 {
@@ -81,9 +89,6 @@ func loop() {
 			}
 		}
 	}
-	if time.Now().Sub(lastRequestTime).Milliseconds() >= 10000 {
-		makeHTTPRequest()
-	}
 }
 
 func makeHTTPRequest() {
@@ -101,7 +106,7 @@ func makeHTTPRequest() {
 	message("\r\n---------------\r\nDialing TCP connection")
 	conn, err = net.DialTCP("tcp", laddr, raddr)
 	for ; err != nil; conn, err = net.DialTCP("tcp", laddr, raddr) {
-		message("connection failed: " + err.Error())
+		message("Connection failed: " + err.Error())
 		time.Sleep(5 * time.Second)
 	}
 	println("Connected!\r")
@@ -109,7 +114,7 @@ func makeHTTPRequest() {
 	print("Sending HTTP request...")
 	fmt.Fprintln(conn, "GET / HTTP/1.1")
 	fmt.Fprintln(conn, "Host:", server)
-	fmt.Fprintln(conn, "User-Agent: TinyGo/0.10.0")
+	fmt.Fprintln(conn, "User-Agent: TinyGo")
 	fmt.Fprintln(conn, "Connection: close")
 	fmt.Fprintln(conn)
 	println("Sent!\r\n\r")
@@ -117,19 +122,14 @@ func makeHTTPRequest() {
 	lastRequestTime = time.Now()
 }
 
-func readLine(conn *net.TCPSerialConn) string {
-	println("Attempting to read...\r")
-	b := buf[:]
-	for expiry := time.Now().Unix() + 10; time.Now().Unix() > expiry; {
-		if n, err := conn.Read(b); n > 0 && err == nil {
-			return string(b[0:n])
-		}
-	}
-	return ""
-}
-
 // connect to access point
 func connectToAP() {
+	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/ws2812/arduino.go

@@ -0,0 +1,9 @@
+// +build arduino
+
+package main
+
+import "machine"
+
+// Replace neo in the code below to match the pin
+// that you are using if different.
+var neo = machine.D2

examples/ws2812/others.go

@@ -1,4 +1,4 @@
-// +build !digispark
+// +build !digispark,!arduino
 
 package main
 

flash/flash.go

@@ -133,6 +133,8 @@ func (dev *Device) Configure(config *DeviceConfig) (err error) {
 	time.Sleep(30 * time.Microsecond)
 
 	// Speed up to max device frequency
+	// I propose a check here for max frequency, but not put that functionality directly into the driver.
+	// Either that or we have to change the signature of the SPI interface in the machine package itself.
 	if dev.attrs.MaxClockSpeedMHz > 0 {
 		err := dev.trans.setClockSpeed(uint32(dev.attrs.MaxClockSpeedMHz) * 1e6)
 		if err != nil {
@@ -288,9 +290,8 @@ func (dev *Device) EraseBlockSize() int64 {
 // supports this. The start and len parameters are in block numbers, use
 // EraseBlockSize to map addresses to blocks.
 func (dev *Device) EraseBlocks(start, len int64) error {
-	// TODO: maybe combine sector erase operations into block erase operations
 	for i := start; i < start+len; i++ {
-		if err := dev.EraseSector(uint32(i)); err != nil {
+		if err := dev.EraseBlock(uint32(i)); err != nil {
 			return err
 		}
 	}

flash/transport_spi.go

@@ -1,6 +1,8 @@
 package flash
 
-import "machine"
+import (
+	"machine"
+)
 
 type transport interface {
 	configure(config *DeviceConfig)

go.mod

@@ -1,5 +1,8 @@
 module tinygo.org/x/drivers
 
-go 1.14
+go 1.15
 
-require github.com/eclipse/paho.mqtt.golang v1.2.0
+require (
+	github.com/eclipse/paho.mqtt.golang v1.2.0
+	github.com/frankban/quicktest v1.10.2
+)

go.sum

@@ -1,2 +1,13 @@
 github.com/eclipse/paho.mqtt.golang v1.2.0 h1:1F8mhG9+aO5/xpdtFkW4SxOJB67ukuDC3t2y2qayIX0=
 github.com/eclipse/paho.mqtt.golang v1.2.0/go.mod h1:H9keYFcgq3Qr5OUJm/JZI/i6U7joQ8SYLhZwfeOo6Ts=
+github.com/frankban/quicktest v1.10.2 h1:19ARM85nVi4xH7xPXuc5eM/udya5ieh7b/Sv+d844Tk=
+github.com/frankban/quicktest v1.10.2/go.mod h1:K+q6oSqb0W0Ininfk863uOk1lMy69l/P6txr3mVT54s=
+github.com/google/go-cmp v0.5.2 h1:X2ev0eStA3AbceY54o37/0PQ/UWqKEiiO2dKL5OPaFM=
+github.com/google/go-cmp v0.5.2/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/kr/pretty v0.2.1 h1:Fmg33tUaq4/8ym9TJN1x7sLJnHVwhP33CNkpYV/7rwI=
+github.com/kr/pretty v0.2.1/go.mod h1:ipq/a2n7PKx3OHsz4KJII5eveXtPO4qwEXGdVfWzfnI=
+github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
+github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
+github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
+golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
+golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=

gps/gps.go

@@ -3,24 +3,31 @@ package gps // import "tinygo.org/x/drivers/gps"
 
 import (
 	"encoding/hex"
-	"machine"
+	"errors"
 	"strings"
 	"time"
+
+	"tinygo.org/x/drivers"
+)
+
+var (
+	errInvalidNMEASentenceLength = errors.New("invalid NMEA sentence length")
+	errInvalidNMEAChecksum       = errors.New("invalid NMEA sentence checksum")
 )
 
 // Device wraps a connection to a GPS device.
-type GPSDevice struct {
+type Device struct {
 	buffer   []byte
 	bufIdx   int
 	sentence strings.Builder
-	uart     *machine.UART
-	bus      *machine.I2C
+	uart     drivers.UART
+	bus      drivers.I2C
 	address  uint16
 }
 
 // NewUART creates a new UART GPS connection. The UART must already be configured.
-func NewUART(uart *machine.UART) GPSDevice {
-	return GPSDevice{
+func NewUART(uart drivers.UART) Device {
+	return Device{
 		uart:     uart,
 		buffer:   make([]byte, bufferSize),
 		bufIdx:   bufferSize,
@@ -29,8 +36,8 @@ func NewUART(uart *machine.UART) GPSDevice {
 }
 
 // NewI2C creates a new I2C GPS connection.
-func NewI2C(bus *machine.I2C) GPSDevice {
-	return GPSDevice{
+func NewI2C(bus drivers.I2C) Device {
+	return Device{
 		bus:      bus,
 		address:  I2C_ADDRESS,
 		buffer:   make([]byte, bufferSize),
@@ -39,17 +46,17 @@ func NewI2C(bus *machine.I2C) GPSDevice {
 	}
 }
 
-// ReadNextSentence returns the next valid NMEA sentence from the GPS device.
-func (gps *GPSDevice) NextSentence() (sentence string) {
+// NextSentence returns the next valid NMEA sentence from the GPS device.
+func (gps *Device) NextSentence() (sentence string, err error) {
 	sentence = gps.readNextSentence()
-	for !validSentence(sentence) {
-		sentence = gps.readNextSentence()
+	if err = validSentence(sentence); err != nil {
+		return "", err
 	}
-	return sentence
+	return sentence, nil
 }
 
 // readNextSentence returns the next sentence from the GPS device.
-func (gps *GPSDevice) readNextSentence() (sentence string) {
+func (gps *Device) readNextSentence() (sentence string) {
 	gps.sentence.Reset()
 	var b byte = ' '
 
@@ -69,7 +76,7 @@ func (gps *GPSDevice) readNextSentence() (sentence string) {
 	return sentence
 }
 
-func (gps *GPSDevice) readNextByte() (b byte) {
+func (gps *Device) readNextByte() (b byte) {
 	gps.bufIdx += 1
 	if gps.bufIdx >= bufferSize {
 		gps.fillBuffer()
@@ -77,7 +84,7 @@ func (gps *GPSDevice) readNextByte() (b byte) {
 	return gps.buffer[gps.bufIdx]
 }
 
-func (gps *GPSDevice) fillBuffer() {
+func (gps *Device) fillBuffer() {
 	if gps.uart != nil {
 		gps.uartFillBuffer()
 	} else {
@@ -85,7 +92,7 @@ func (gps *GPSDevice) fillBuffer() {
 	}
 }
 
-func (gps *GPSDevice) uartFillBuffer() {
+func (gps *Device) uartFillBuffer() {
 	for gps.uart.Buffered() < bufferSize {
 		time.Sleep(100 * time.Millisecond)
 	}
@@ -93,7 +100,7 @@ func (gps *GPSDevice) uartFillBuffer() {
 	gps.bufIdx = 0
 }
 
-func (gps *GPSDevice) i2cFillBuffer() {
+func (gps *Device) i2cFillBuffer() {
 	for gps.available() < bufferSize {
 		time.Sleep(100 * time.Millisecond)
 	}
@@ -102,7 +109,7 @@ func (gps *GPSDevice) i2cFillBuffer() {
 }
 
 // Available returns how many bytes of GPS data are currently available.
-func (gps *GPSDevice) available() (available int) {
+func (gps *Device) available() (available int) {
 	var lengthBytes [2]byte
 	gps.bus.Tx(gps.address, []byte{BYTES_AVAIL_REG}, lengthBytes[0:2])
 	available = int(lengthBytes[0])*256 + int(lengthBytes[1])
@@ -110,7 +117,7 @@ func (gps *GPSDevice) available() (available int) {
 }
 
 // WriteBytes sends data/commands to the GPS device
-func (gps *GPSDevice) WriteBytes(bytes []byte) {
+func (gps *Device) WriteBytes(bytes []byte) {
 	if gps.uart != nil {
 		gps.uart.Write(bytes)
 	} else {
@@ -119,14 +126,18 @@ func (gps *GPSDevice) WriteBytes(bytes []byte) {
 }
 
 // validSentence checks if a sentence has been received uncorrupted
-func validSentence(sentence string) bool {
+func validSentence(sentence string) error {
 	if len(sentence) < 4 || sentence[0] != '$' || sentence[len(sentence)-3] != '*' {
-		return false
+		return errInvalidNMEASentenceLength
 	}
 	var cs byte = 0
 	for i := 1; i < len(sentence)-3; i++ {
 		cs ^= sentence[i]
 	}
 	checksum := hex.EncodeToString([]byte{cs})
-	return (checksum[0] == sentence[len(sentence)-2]) && (checksum[1] == sentence[len(sentence)-1])
+	if (checksum[0] != sentence[len(sentence)-2]) || (checksum[1] != sentence[len(sentence)-1]) {
+		return errInvalidNMEAChecksum
+	}
+
+	return nil
 }

gps/gpsparser.go

@@ -1,92 +1,131 @@
 package gps
 
 import (
+	"errors"
 	"strconv"
 	"strings"
 	"time"
 )
 
-type GPSParser struct {
-	gpsDevice GPSDevice
+var (
+	errEmptyNMEASentence   = errors.New("cannot parse empty NMEA sentence")
+	errUnknownNMEASentence = errors.New("unsupported NMEA sentence type")
+	errInvalidGGASentence  = errors.New("invalid GGA NMEA sentence")
+	errInvalidRMCSentence  = errors.New("invalid RMC NMEA sentence")
+)
+
+// Parser for GPS NMEA sentences.
+type Parser struct {
 }
 
-// fix is a GPS location fix
+// Fix is a GPS location fix
 type Fix struct {
-	Valid      bool
-	Time       time.Time
-	Latitude   float32
-	Longitude  float32
-	Altitude   int32
+	// Valid if the fix was valid.
+	Valid bool
+
+	// Time that the fix was taken, in UTC time.
+	Time time.Time
+
+	// Latitude is the decimal latitude. Negative numbers indicate S.
+	Latitude float32
+
+	// Longitude is the decimal longitude. Negative numbers indicate E.
+	Longitude float32
+
+	// Altitude is only returned for GGA sentences.
+	Altitude int32
+
+	// Satellites is the number of visible satellites, but is only returned for GGA sentences.
 	Satellites int16
+
+	// Speed based on reported movement. Only returned for RMC sentences.
+	Speed float32
+
+	// Heading based on reported movement. Only returned for RMC sentences.
+	Heading float32
 }
 
-func Parser(gpsDevice GPSDevice) GPSParser {
-	return GPSParser{
-		gpsDevice: gpsDevice,
+// NewParser returns a GPS NMEA Parser.
+func NewParser() Parser {
+	return Parser{}
+}
+
+// Parse parses a NMEA sentence looking for fix info.
+func (parser *Parser) Parse(sentence string) (fix Fix, err error) {
+	if sentence == "" {
+		err = errEmptyNMEASentence
+		return
 	}
-}
-
-// NextFix returns the next GPS location Fix from the GPS device
-func (parser *GPSParser) NextFix() (fix Fix) {
-	var ggaSentence = nextGGA(parser.gpsDevice)
-	var ggaFields = strings.Split(ggaSentence, ",")
-	fix.Altitude = findAltitude(ggaFields)
-	fix.Satellites = findSatellites(ggaFields)
-	fix.Longitude = findLongitude(ggaFields)
-	fix.Latitude = findLatitude(ggaFields)
-	fix.Time = findTime(ggaFields)
-	fix.Valid = (fix.Altitude != -99999) && (fix.Satellites > 0)
-	return fix
-}
-
-// nextGGA returns the next GGA type sentence from the GPS device
-// $--GGA,,,,,,,,,,,,,,*hh
-func nextGGA(gpsDevice GPSDevice) (sentence string) {
-	for {
-		sentence = gpsDevice.NextSentence()
-		if sentence[3:6] == "GGA" {
-			return sentence
+	typ := sentence[3:6]
+	switch typ {
+	case "GGA":
+		fields := strings.Split(sentence, ",")
+		if len(fields) != 15 {
+			err = errInvalidGGASentence
+			return
 		}
+
+		fix.Altitude = findAltitude(fields[9])
+		fix.Satellites = findSatellites(fields[7])
+		fix.Longitude = findLongitude(fields[4], fields[5])
+		fix.Latitude = findLatitude(fields[2], fields[3])
+		fix.Time = findTime(fields[1])
+		fix.Valid = (fix.Altitude != -99999) && (fix.Satellites > 0)
+	case "RMC":
+		fields := strings.Split(sentence, ",")
+		if len(fields) != 13 {
+			err = errInvalidRMCSentence
+			return
+		}
+
+		fix.Longitude = findLongitude(fields[5], fields[6])
+		fix.Latitude = findLatitude(fields[3], fields[4])
+		fix.Time = findTime(fields[1])
+		fix.Speed = findSpeed(fields[7])
+		fix.Heading = findHeading(fields[8])
+		fix.Valid = (len(fields[2]) > 0 && fields[2][0:1] == "A")
+	default:
+		err = errUnknownNMEASentence
 	}
+	return
 }
 
-// findTime returns the time from a GGA sentence:
+// findTime returns the time from an NMEA sentence:
 // $--GGA,hhmmss.ss,,,,,,,,,,,,,*xx
-func findTime(ggaFields []string) time.Time {
-	if len(ggaFields) < 1 || len(ggaFields[1]) < 6 {
+func findTime(val string) time.Time {
+	if len(val) < 6 {
 		return time.Time{}
 	}
-	ts := strings.Builder{}
-	ts.WriteString(ggaFields[1][0:2])
-	ts.WriteString(":")
-	ts.WriteString(ggaFields[1][2:4])
-	ts.WriteString(":")
-	ts.WriteString(ggaFields[1][4:6])
-	var t, _ = time.Parse("15:04:05", ts.String())
+
+	h, _ := strconv.ParseInt(val[0:2], 10, 8)
+	m, _ := strconv.ParseInt(val[2:4], 10, 8)
+	s, _ := strconv.ParseInt(val[4:6], 10, 8)
+	ms, _ := strconv.ParseInt(val[7:10], 10, 16)
+	t := time.Date(0, 0, 0, int(h), int(m), int(s), int(ms), time.UTC)
 
 	return t
 }
 
-// findAltitude returns the altitude from a GGA sentence:
+// findAltitude returns the altitude from an NMEA sentence:
 // $--GGA,,,,,,,,,25.8,,,,,*63
-func findAltitude(ggaFields []string) int32 {
-	if len(ggaFields) > 8 && len(ggaFields[9]) > 0 {
-		var v, _ = strconv.ParseFloat(ggaFields[9], 32)
+func findAltitude(val string) int32 {
+	if len(val) > 0 {
+		var v, _ = strconv.ParseFloat(val, 32)
 		return int32(v)
 	}
 	return -99999
 }
 
-// findLatitude returns the Latitude from a GGA sentence:
+// findLatitude returns the Latitude from an NMEA sentence:
 // $--GGA,,ddmm.mmmmm,x,,,,,,,,,,,*hh
-func findLatitude(ggaFields []string) float32 {
-	if len(ggaFields) > 2 && len(ggaFields[2]) > 8 {
-		var dd = ggaFields[2][0:2]
-		var mm = ggaFields[2][2:]
+func findLatitude(val, hemi string) float32 {
+	if len(val) > 8 {
+		var dd = val[0:2]
+		var mm = val[2:]
 		var d, _ = strconv.ParseFloat(dd, 32)
 		var m, _ = strconv.ParseFloat(mm, 32)
 		var v = float32(d + (m / 60))
-		if ggaFields[3] == "S" {
+		if hemi == "S" {
 			v *= -1
 		}
 		return v
@@ -94,16 +133,16 @@ func findLatitude(ggaFields []string) float32 {
 	return 0.0
 }
 
-// findLatitude returns the longitude from a GGA sentence:
+// findLatitude returns the longitude from an NMEA sentence:
 // $--GGA,,,,dddmm.mmmmm,x,,,,,,,,,*hh
-func findLongitude(ggaFields []string) float32 {
-	if len(ggaFields) > 4 && len(ggaFields[4]) > 8 {
-		var ddd = ggaFields[4][0:3]
-		var mm = ggaFields[4][3:]
+func findLongitude(val, hemi string) float32 {
+	if len(val) > 8 {
+		var ddd = val[0:3]
+		var mm = val[3:]
 		var d, _ = strconv.ParseFloat(ddd, 32)
 		var m, _ = strconv.ParseFloat(mm, 32)
 		var v = float32(d + (m / 60))
-		if ggaFields[5] == "W" {
+		if hemi == "W" {
 			v *= -1
 		}
 		return v
@@ -111,14 +150,32 @@ func findLongitude(ggaFields []string) float32 {
 	return 0.0
 }
 
-// findSatellites returns the satellites from a GGA sentence:
+// findSatellites returns the satellites from an NMEA sentence:
 // $--GGA,,,,,,,nn,,,,,,,*hh
-func findSatellites(ggaFields []string) (n int16) {
-	if len(ggaFields) > 6 && len(ggaFields[7]) > 0 {
-		var nn = ggaFields[7]
+func findSatellites(val string) (n int16) {
+	if len(val) > 0 {
+		var nn = val
 		var v, _ = strconv.ParseInt(nn, 10, 32)
 		n = int16(v)
 		return n
 	}
 	return 0
 }
+
+// findSpeed returns the speed from an RMC NMEA sentence.
+func findSpeed(val string) float32 {
+	if len(val) > 0 {
+		var v, _ = strconv.ParseFloat(val, 32)
+		return float32(v)
+	}
+	return 0
+}
+
+// findHeading returns the speed from an RMC NMEA sentence.
+func findHeading(val string) float32 {
+	if len(val) > 0 {
+		var v, _ = strconv.ParseFloat(val, 32)
+		return float32(v)
+	}
+	return 0
+}

gps/registers.go

@@ -13,5 +13,5 @@ const (
 )
 
 const (
-	bufferSize = 32
+	bufferSize = 100
 )

gps/ublox.go

@@ -24,25 +24,25 @@ var cfg_gnss_cmd = [...]byte{
 	0x01, 0x01, 0x06, 0x08, 0x0E, 0x00, 0x00, 0x00,
 	0x01, 0x01, 0xFC, 0x11}
 
-func FlightMode(gpsDevice GPSDevice) (err error) {
-	err = sendCommand(gpsDevice, flight_mode_cmd[:])
+func FlightMode(d Device) (err error) {
+	err = sendCommand(d, flight_mode_cmd[:])
 	return err
 }
 
-func SetCfgGNSS(gpsDevice GPSDevice) (err error) {
-	err = sendCommand(gpsDevice, cfg_gnss_cmd[:])
+func SetCfgGNSS(d Device) (err error) {
+	err = sendCommand(d, cfg_gnss_cmd[:])
 	return err
 }
 
-func sendCommand(gpsDevice GPSDevice, command []byte) (err error) {
-	gpsDevice.WriteBytes(command)
+func sendCommand(d Device, command []byte) (err error) {
+	d.WriteBytes(command)
 	start := time.Now()
 	for time.Now().Sub(start) < 1000 {
-		if gpsDevice.readNextByte() == '\n' {
-			if gpsDevice.readNextByte() == 0xB5 {
-				gpsDevice.readNextByte()
-				if gpsDevice.readNextByte() == 0x05 {
-					if gpsDevice.readNextByte() == 0x01 {
+		if d.readNextByte() == '\n' {
+			if d.readNextByte() == 0xB5 {
+				d.readNextByte()
+				if d.readNextByte() == 0x05 {
+					if d.readNextByte() == 0x01 {
 						return
 					}
 				}

hd44780/gpio.go

@@ -57,9 +57,16 @@ func (g *GPIO) SetCommandMode(set bool) {
 	}
 }
 
+// WriteOnly is true if you passed rw in as machine.NoPin
+func (g *GPIO) WriteOnly() bool {
+	return g.rw == machine.NoPin
+}
+
 // Write writes len(data) bytes from data to display driver
 func (g *GPIO) Write(data []byte) (n int, err error) {
-	g.rw.Low()
+	if !g.WriteOnly() {
+		g.rw.Low()
+	}
 	for _, d := range data {
 		g.write(d)
 		n++
@@ -89,6 +96,9 @@ func (g *GPIO) Read(data []byte) (n int, err error) {
 	if len(data) == 0 {
 		return 0, errors.New("length greater than 0 is required")
 	}
+	if g.WriteOnly() {
+		return 0, errors.New("Read not supported if RW not wired")
+	}
 	g.rw.High()
 	g.reconfigureGPIOMode(machine.PinInput)
 	for i := 0; i < len(data); i++ {

hd44780/hd44780.go

@@ -11,9 +11,23 @@ import (
 	"time"
 )
 
+const (
+	// These are the default execution times for the Clear and
+	// Home commands and everything else.
+	//
+	// These are used if RW is passed as machine.NoPin and ignored
+	// otherwise.
+	//
+	// They are set conservatively here and can be tweaked in the
+	// Config structure.
+	DefaultClearHomeTime = 80 * time.Millisecond
+	DefaultInstrExecTime = 80 * time.Microsecond
+)
+
 type Buser interface {
 	io.ReadWriter
 	SetCommandMode(set bool)
+	WriteOnly() bool
 }
 
 type Device struct {
@@ -28,6 +42,9 @@ type Device struct {
 
 	cursor     cursor
 	busyStatus []byte
+
+	clearHomeTime time.Duration // time clear/home instructions might take
+	instrExecTime time.Duration // time all other instructions might take
 }
 
 type cursor struct {
@@ -35,14 +52,18 @@ type cursor struct {
 }
 
 type Config struct {
-	Width       int16
-	Height      int16
-	CursorBlink bool
-	CursorOnOff bool
-	Font        uint8
+	Width         int16
+	Height        int16
+	CursorBlink   bool
+	CursorOnOff   bool
+	Font          uint8
+	ClearHomeTime time.Duration // time clear/home instructions might take - use 0 for the default
+	InstrExecTime time.Duration // time all other instructions might take - use 0 for the default
 }
 
 // NewGPIO4Bit returns 4bit data length HD44780 driver. Datapins are LCD DB pins starting from DB4 to DB7
+//
+// If your device has RW set permanently to ground then pass in rw as machine.NoPin
 func NewGPIO4Bit(dataPins []machine.Pin, e, rs, rw machine.Pin) (Device, error) {
 	const fourBitMode = 4
 	if len(dataPins) != fourBitMode {
@@ -52,6 +73,8 @@ func NewGPIO4Bit(dataPins []machine.Pin, e, rs, rw machine.Pin) (Device, error)
 }
 
 // NewGPIO8Bit returns 8bit data length HD44780 driver. Datapins are LCD DB pins starting from DB0 to DB7
+//
+// If your device has RW set permanently to ground then pass in rw as machine.NoPin
 func NewGPIO8Bit(dataPins []machine.Pin, e, rs, rw machine.Pin) (Device, error) {
 	const eightBitMode = 8
 	if len(dataPins) != eightBitMode {
@@ -68,6 +91,8 @@ func (d *Device) Configure(cfg Config) error {
 	if d.width == 0 || d.height == 0 {
 		return errors.New("width and height must be set")
 	}
+	d.clearHomeTime = cfg.ClearHomeTime
+	d.instrExecTime = cfg.InstrExecTime
 	memoryMap := uint8(ONE_LINE)
 	if d.height > 1 {
 		memoryMap = TWO_LINE
@@ -186,7 +211,7 @@ func (d *Device) SendCommand(command byte) {
 	d.bus.SetCommandMode(true)
 	d.bus.Write([]byte{command})
 
-	for d.Busy() {
+	for d.busy(command == DISPLAY_CLEAR || command == CURSOR_HOME) {
 	}
 }
 
@@ -195,7 +220,7 @@ func (d *Device) sendData(data byte) {
 	d.bus.SetCommandMode(false)
 	d.bus.Write([]byte{data})
 
-	for d.Busy() {
+	for d.busy(false) {
 	}
 }
 
@@ -207,13 +232,39 @@ func (d *Device) CreateCharacter(cgramAddr uint8, data []byte) {
 	}
 }
 
-// Busy returns true when hd447890 is busy
-func (d *Device) Busy() bool {
+// busy returns true when hd447890 is busy
+// or after the timeout specified
+func (d *Device) busy(longDelay bool) bool {
+	if d.bus.WriteOnly() {
+		// Can't read busy flag if write only, so sleep a bit then return
+		if longDelay {
+			// Note that we sleep like this so the default
+			// time.Sleep is time.Sleep(constant) as
+			// time.Sleep(variable) doesn't seem to work on AVR yet
+			if d.clearHomeTime != 0 {
+				time.Sleep(d.clearHomeTime)
+			} else {
+				time.Sleep(DefaultClearHomeTime)
+			}
+		} else {
+			if d.instrExecTime != 0 {
+				time.Sleep(d.instrExecTime)
+			} else {
+				time.Sleep(DefaultInstrExecTime)
+			}
+		}
+		return false
+	}
 	d.bus.SetCommandMode(true)
 	d.bus.Read(d.busyStatus)
 	return (d.busyStatus[0] & BUSY) > 0
 }
 
+// Busy returns true when hd447890 is busy
+func (d *Device) Busy() bool {
+	return d.busy(false)
+}
+
 // Size returns the current size of the display.
 func (d *Device) Size() (w, h int16) {
 	return int16(d.width), int16(d.height)

hd44780i2c/hd44780i2c.go

@@ -7,13 +7,14 @@ package hd44780i2c
 
 import (
 	"errors"
-	"machine"
 	"time"
+
+	"tinygo.org/x/drivers"
 )
 
 // Device wraps an I2C connection to a HD44780 I2C LCD with related data.
 type Device struct {
-	bus             machine.I2C
+	bus             drivers.I2C
 	addr            uint8
 	width           uint8
 	height          uint8
@@ -41,7 +42,7 @@ type Config struct {
 // configured.
 //
 // This function only creates the Device object, it does not touch the device.
-func New(bus machine.I2C, addr uint8) Device {
+func New(bus drivers.I2C, addr uint8) Device {
 	if addr == 0 {
 		addr = 0x27
 	}

hub75/hub75.go

@@ -9,6 +9,8 @@ import (
 	"image/color"
 	"machine"
 	"time"
+
+	"tinygo.org/x/drivers"
 )
 
 type Config struct {
@@ -21,7 +23,7 @@ type Config struct {
 }
 
 type Device struct {
-	bus               machine.SPI
+	bus               drivers.SPI
 	a                 machine.Pin
 	b                 machine.Pin
 	c                 machine.Pin
@@ -52,7 +54,7 @@ type Device struct {
 }
 
 // New returns a new HUB75 driver. Pass in a fully configured SPI bus.
-func New(b machine.SPI, latPin, oePin, aPin, bPin, cPin, dPin machine.Pin) Device {
+func New(b drivers.SPI, latPin, oePin, aPin, bPin, cPin, dPin machine.Pin) Device {
 	aPin.Configure(machine.PinConfig{Mode: machine.PinOutput})
 	bPin.Configure(machine.PinConfig{Mode: machine.PinOutput})
 	cPin.Configure(machine.PinConfig{Mode: machine.PinOutput})

i2c.go

@@ -0,0 +1,9 @@
+package drivers
+
+// I2C represents an I2C bus. It is notably implemented by the
+// machine.I2C type.
+type I2C interface {
+	ReadRegister(addr uint8, r uint8, buf []byte) error
+	WriteRegister(addr uint8, r uint8, buf []byte) error
+	Tx(addr uint16, w, r []byte) error
+}

ili9341/ili9341.go

@@ -20,7 +20,7 @@ type Device struct {
 	driver   driver
 
 	x0, x1 int16 // cached address window; prevents useless/expensive
-	y0, y1 int16 // syscalls to PASET, CASET, and RAMWR
+	y0, y1 int16 // syscalls to PASET and CASET
 
 	dc  machine.Pin
 	cs  machine.Pin
@@ -28,6 +28,7 @@ type Device struct {
 	rd  machine.Pin
 }
 
+// Configure prepares display for use
 func (d *Device) Configure(config Config) {
 
 	if config.Width == 0 {
@@ -145,6 +146,7 @@ func (d *Device) Display() error {
 	return nil
 }
 
+// DrawRGBBitmap copies an RGB bitmap to the internal buffer at given coordinates
 func (d *Device) DrawRGBBitmap(x, y int16, data []uint16, w, h int16) error {
 	k, i := d.Size()
 	if x < 0 || y < 0 || w <= 0 || h <= 0 ||
@@ -158,7 +160,7 @@ func (d *Device) DrawRGBBitmap(x, y int16, data []uint16, w, h int16) error {
 	return nil
 }
 
-// FillRectangle fills a rectangle at a given coordinates with a color
+// FillRectangle fills a rectangle at given coordinates with a color
 func (d *Device) FillRectangle(x, y, width, height int16, c color.RGBA) error {
 	k, i := d.Size()
 	if x < 0 || y < 0 || width <= 0 || height <= 0 ||
@@ -173,7 +175,7 @@ func (d *Device) FillRectangle(x, y, width, height int16, c color.RGBA) error {
 	return nil
 }
 
-// DrawRectangle fills a rectangle at a given coordinates with a color
+// DrawRectangle draws a rectangle at given coordinates with a color
 func (d *Device) DrawRectangle(x, y, w, h int16, c color.RGBA) error {
 	if err := d.DrawFastHLine(x, x+w-1, y, c); err != nil {
 		return err
@@ -215,6 +217,7 @@ func (d *Device) FillScreen(c color.RGBA) {
 	}
 }
 
+// GetRotation returns the current rotation of the device
 func (d *Device) GetRotation() Rotation {
 	return d.rotation
 }
@@ -236,7 +239,8 @@ func (d *Device) SetRotation(rotation Rotation) {
 	d.rotation = rotation
 }
 
-// SetScrollWindow sets an area to scroll with fixed top and bottom parts of the display
+// SetScrollArea sets an area to scroll with fixed top/bottom or left/right parts of the display
+// Rotation affects scroll direction
 func (d *Device) SetScrollArea(topFixedArea, bottomFixedArea int16) {
 	d.sendCommand(VSCRDEF, []uint8{
 		uint8(topFixedArea >> 8), uint8(topFixedArea),
@@ -251,7 +255,7 @@ func (d *Device) SetScroll(line int16) {
 	d.sendCommand(VSCRSADD, []uint8{uint8(line >> 8), uint8(line)})
 }
 
-// SpotScroll returns the display to its normal state
+// StopScroll returns the display to its normal state
 func (d *Device) StopScroll() {
 	d.sendCommand(NORON, nil)
 }
@@ -260,10 +264,8 @@ func (d *Device) StopScroll() {
 func (d *Device) setWindow(x, y, w, h int16) {
 	//x += d.columnOffset
 	//y += d.rowOffset
-	wr := false
 	x1 := x + w - 1
 	if x != d.x0 || x1 != d.x1 {
-		wr = true
 		d.sendCommand(CASET, []uint8{
 			uint8(x >> 8), uint8(x), uint8(x1 >> 8), uint8(x1),
 		})
@@ -271,15 +273,12 @@ func (d *Device) setWindow(x, y, w, h int16) {
 	}
 	y1 := y + h - 1
 	if y != d.y0 || y1 != d.y1 {
-		wr = true
 		d.sendCommand(PASET, []uint8{
 			uint8(y >> 8), uint8(y), uint8(y1 >> 8), uint8(y1),
 		})
 		d.y0, d.y1 = y, y1
 	}
-	if wr {
-		d.sendCommand(RAMWR, nil)
-	}
+	d.sendCommand(RAMWR, nil)
 }
 
 //go:inline

ili9341/spi_atsamd21.go

@@ -11,7 +11,7 @@ type spiDriver struct {
 	bus machine.SPI
 }
 
-func NewSpi(bus machine.SPI, dc, cs, rst machine.Pin) *Device {
+func NewSPI(bus machine.SPI, dc, cs, rst machine.Pin) *Device {
 	return &Device{
 		dc:  dc,
 		cs:  cs,

ili9341/spi_atsamd51.go

@@ -11,7 +11,7 @@ type spiDriver struct {
 	bus machine.SPI
 }
 
-func NewSpi(bus machine.SPI, dc, cs, rst machine.Pin) *Device {
+func NewSPI(bus machine.SPI, dc, cs, rst machine.Pin) *Device {
 	return &Device{
 		dc:  dc,
 		cs:  cs,

ina260/ina260.go

@@ -0,0 +1,112 @@
+package ina260
+
+import "tinygo.org/x/drivers"
+
+// Device wraps an I2C connection to an INA260 device.
+type Device struct {
+	bus     drivers.I2C
+	Address uint16
+}
+
+// Config holds the configuration of the INA260 device.
+type Config struct {
+	// One of AVGMODE_XXX
+	AverageMode byte
+
+	// One of CONVTIME_XXXXUSEC
+	VoltConvTime byte
+
+	// One of CONVTIME_XXXXUSEC
+	CurrentConvTime byte
+
+	// Multiple of MODE_XXXX
+	Mode byte
+}
+
+// New creates a new INA260 connection. The I2C bus must already be
+// configured.
+//
+// This function only creates the Device object, it does not touch the device.
+func New(bus drivers.I2C) Device {
+	return Device{
+		bus:     bus,
+		Address: Address,
+	}
+}
+
+// Configure sets up the device.
+//
+// This only needs to be called to override built-in defaults. By default,
+// the device starts with:
+//
+// * AverageMode = AVGMODE_1
+// * VoltConvTime = CONVTIME_1100USEC
+// * CurrentConvTime = CONVTIME_1100USEC
+// * Mode = MODE_CONTINUOUS | MODE_VOLTAGE | MODE_CURRENT
+//
+func (d *Device) Configure(cfg Config) {
+	var val uint16
+
+	val = uint16(cfg.AverageMode&0x7) << 9
+	val |= uint16(cfg.VoltConvTime&0x7) << 6
+	val |= uint16(cfg.CurrentConvTime&0x7) << 3
+	val |= uint16(cfg.Mode & 0x7)
+
+	d.WriteRegister(REG_CONFIG, val)
+}
+
+// Resets the device, setting all registers to default values
+func (d *Device) Reset() {
+	d.WriteRegister(REG_CONFIG, 0x8000)
+}
+
+// Connected returns whether an INA260 has been found.
+func (d *Device) Connected() bool {
+	return d.ReadRegister(REG_MANF_ID) == MANF_ID &&
+		(d.ReadRegister(REG_DIE_ID)&DEVICE_ID_MASK) == DEVICE_ID
+}
+
+// Gets the measured current in µA (max resolution 1.25mA)
+func (d *Device) Current() int32 {
+	val := d.ReadRegister(REG_CURRENT)
+
+	if val&0x8000 == 0 {
+		return int32(val) * 1250
+	}
+
+	// Two's complement, convert to signed int
+	return -(int32(^val) + 1) * 1250
+}
+
+// Gets the measured voltage in µV (max resolution 1.25mV)
+func (d *Device) Voltage() int32 {
+	val := d.ReadRegister(REG_BUSVOLTAGE)
+
+	if val&0x8000 == 0 {
+		return int32(val) * 1250
+	}
+
+	// Two's complement, convert to signed int
+	return -(int32(^val) + 1) * 1250
+}
+
+// Gets the measured power in µW (max resolution 10mW)
+func (d *Device) Power() int32 {
+	return int32(d.ReadRegister(REG_POWER)) * 10000
+}
+
+// Read a register
+func (d *Device) ReadRegister(reg uint8) uint16 {
+	data := []byte{0, 0}
+	d.bus.ReadRegister(uint8(d.Address), reg, data)
+	return (uint16(data[0]) << 8) | uint16(data[1])
+}
+
+// Write to a register
+func (d *Device) WriteRegister(reg uint8, v uint16) {
+	data := []byte{0, 0}
+	data[0] = byte(v >> 8)
+	data[1] = byte(v & 0xff)
+
+	d.bus.WriteRegister(uint8(d.Address), reg, data)
+}

ina260/ina260_test.go

@@ -0,0 +1,80 @@
+package ina260
+
+import (
+	"testing"
+
+	qt "github.com/frankban/quicktest"
+	"tinygo.org/x/drivers/tester"
+)
+
+func TestDefaultI2CAddress(t *testing.T) {
+	c := qt.New(t)
+	bus := tester.NewI2CBus(c)
+	dev := New(bus)
+	c.Assert(dev.Address, qt.Equals, uint16(Address))
+}
+
+func TestConnected(t *testing.T) {
+	c := qt.New(t)
+	bus := tester.NewI2CBus(c)
+	fake := tester.NewI2CDevice16(c, Address)
+	fake.Registers = defaultRegisters()
+	bus.AddDevice(fake)
+
+	dev := New(bus)
+	c.Assert(dev.Connected(), qt.Equals, true)
+}
+
+func TestVoltage(t *testing.T) {
+	c := qt.New(t)
+	bus := tester.NewI2CBus(c)
+	fake := tester.NewI2CDevice16(c, Address)
+	fake.Registers = defaultRegisters()
+	fake.Registers[REG_BUSVOLTAGE] = 0x2570
+	bus.AddDevice(fake)
+
+	dev := New(bus)
+	// Datasheet: 2570h = 11.98V = 11980mV = 11980000uV
+	c.Assert(dev.Voltage(), qt.Equals, int32(11980000))
+}
+
+func TestCurrent(t *testing.T) {
+	c := qt.New(t)
+	bus := tester.NewI2CBus(c)
+	fake := tester.NewI2CDevice16(c, Address)
+	fake.Registers = defaultRegisters()
+	fake.Registers[REG_CURRENT] = 0x2710
+	bus.AddDevice(fake)
+
+	dev := New(bus)
+	// Datasheet: 2710h = 12.5A = 12500mA = 12500000uA
+	c.Assert(dev.Current(), qt.Equals, int32(12500000))
+}
+
+func TestPower(t *testing.T) {
+	c := qt.New(t)
+	bus := tester.NewI2CBus(c)
+	fake := tester.NewI2CDevice16(c, Address)
+	fake.Registers = defaultRegisters()
+	fake.Registers[REG_POWER] = 0x3A7F
+	bus.AddDevice(fake)
+
+	dev := New(bus)
+	// 3A7Fh = 149.75W = 149750mW = 149750000uW
+	c.Assert(dev.Power(), qt.Equals, int32(149750000))
+}
+
+// defaultRegisters returns the default values for all of the device's registers.
+// set TI INA260 datasheet for power-on defaults
+func defaultRegisters() map[uint8]uint16 {
+	return map[uint8]uint16{
+		REG_CONFIG:     0x6127,
+		REG_CURRENT:    0x0000,
+		REG_BUSVOLTAGE: 0x0000,
+		REG_POWER:      0x0000,
+		REG_MASKENABLE: 0x0000,
+		REG_ALERTLIMIT: 0x0000,
+		REG_MANF_ID:    0x5449,
+		REG_DIE_ID:     0x2270,
+	}
+}

ina260/registers.go

@@ -0,0 +1,50 @@
+package ina260
+
+// The default I2C address for this device.
+//
+// The actual address is configurable by connecting address pins.
+const Address = 0x40
+
+// Registers
+const (
+	REG_CONFIG     = 0x00
+	REG_CURRENT    = 0x01
+	REG_BUSVOLTAGE = 0x02
+	REG_POWER      = 0x03
+	REG_MASKENABLE = 0x06
+	REG_ALERTLIMIT = 0x07
+	REG_MANF_ID    = 0xFE
+	REG_DIE_ID     = 0xFF
+)
+
+// Well-Known Values
+const (
+	MANF_ID        = 0x5449 // TI
+	DEVICE_ID      = 0x2270 // 227h
+	DEVICE_ID_MASK = 0xFFF0
+
+	AVGMODE_1    = 0
+	AVGMODE_4    = 1
+	AVGMODE_16   = 2
+	AVGMODE_64   = 3
+	AVGMODE_128  = 4
+	AVGMODE_256  = 5
+	AVGMODE_512  = 6
+	AVGMODE_1024 = 7
+
+	CONVTIME_140USEC  = 0
+	CONVTIME_204USEC  = 1
+	CONVTIME_332USEC  = 2
+	CONVTIME_588USEC  = 3
+	CONVTIME_1100USEC = 4 // 1.1 ms
+	CONVTIME_2116USEC = 5 // 2.1 ms
+	CONVTIME_4156USEC = 6 // 4.2 ms
+	CONVTIME_8244USEC = 7 // 8.2 ms
+
+	MODE_CONTINUOUS = 0x4
+	MODE_TRIGGERED  = 0x0
+	MODE_VOLTAGE    = 0x2
+	MODE_NO_VOLTAGE = 0x0
+	MODE_CURRENT    = 0x1
+	MODE_NO_CURRENT = 0x0
+)

keypad4x4/keypad4x4.go

@@ -0,0 +1,107 @@
+package keypad4x4
+
+import (
+	"machine"
+)
+
+// NoKeyPressed is used, when no key was pressed
+const NoKeyPressed = 255
+
+// Device is used as 4x4 keypad driver
+type Device interface {
+	Configure()
+	GetKey() uint8
+	GetIndices() (int, int)
+}
+
+// device is a driver for 4x4 keypads
+type device struct {
+	inputEnabled bool
+	lastColumn   int
+	lastRow      int
+	columns      [4]machine.Pin
+	rows         [4]machine.Pin
+	mapping      [4][4]uint8
+}
+
+// takes r4 -r1 pins and c4 - c1 pins
+func NewDevice(r4, r3, r2, r1, c4, c3, c2, c1 machine.Pin) Device {
+	result := &device{}
+	result.columns = [4]machine.Pin{c4, c3, c2, c1}
+	result.rows = [4]machine.Pin{r4, r3, r2, r1}
+
+	return result
+}
+
+// Configure sets the column pins as input and the row pins as output
+func (keypad *device) Configure() {
+	inputConfig := machine.PinConfig{Mode: machine.PinInputPullup}
+	for i := range keypad.columns {
+		keypad.columns[i].Configure(inputConfig)
+	}
+
+	outputConfig := machine.PinConfig{Mode: machine.PinOutput}
+	for i := range keypad.rows {
+		keypad.rows[i].Configure(outputConfig)
+		keypad.rows[i].High()
+	}
+
+	keypad.mapping = [4][4]uint8{
+		{0, 1, 2, 3},
+		{4, 5, 6, 7},
+		{8, 9, 10, 11},
+		{12, 13, 14, 15},
+	}
+
+	keypad.inputEnabled = true
+	keypad.lastColumn = -1
+	keypad.lastRow = -1
+}
+
+// GetKey returns the code for the given key.
+// The codes start with 0 at the upper left end of the keypad and end with 15 at the lower right end of the keypad
+// Example:
+// 0	1	2	3
+// 4	5	6	7
+// 8	9	10	11
+// 12	13	14	15
+// returns 255 for no keyPressed
+func (keypad *device) GetKey() uint8 {
+	row, column := keypad.GetIndices()
+	if row == -1 && column == -1 {
+		return NoKeyPressed
+	}
+
+	return keypad.mapping[row][column]
+}
+
+// GetIndices returns the position of the pressed key
+func (keypad *device) GetIndices() (int, int) {
+	for rowIndex, rowPin := range keypad.rows {
+		rowPin.Low()
+
+		for columnIndex := range keypad.columns {
+			columnPin := keypad.columns[columnIndex]
+
+			if !columnPin.Get() && keypad.inputEnabled {
+				keypad.inputEnabled = false
+
+				keypad.lastColumn = columnIndex
+				keypad.lastRow = rowIndex
+
+				return keypad.lastRow, keypad.lastColumn
+			}
+
+			if columnPin.Get() &&
+				columnIndex == keypad.lastColumn &&
+				rowIndex == keypad.lastRow &&
+				!keypad.inputEnabled {
+				keypad.inputEnabled = true
+			}
+		}
+
+		rowPin.High()
+	}
+
+	return -1, -1
+}