vibration for pinetime

LICENSE.txt

@@ -0,0 +1,27 @@
+Copyright (c) 2023 Ayke van Laethem. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+  * Redistributions of source code must retain the above copyright
+    notice, this list of conditions and the following disclaimer.
+  * Redistributions in binary form must reproduce the above copyright
+    notice, this list of conditions and the following disclaimer in
+    the documentation and/or other materials provided with the
+    distribution.
+  * Neither the name of the copyright holder nor the names of its
+    contributors may be used to endorse or promote products derived
+    from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

README.md

@@ -0,0 +1,20 @@
+# TinyGo board abstraction
+
+**This is an experiment.** It may go stale, or it may change in backwards incompatible ways. Don't rely on it too much for now.
+
+## Goals
+
+  * Provide a common abstraction for boards supported by TinyGo.
+  * Provide a simulated board
+  * Auto-generate all board definitions from a devicetree-like format. Don't write any of the definitions by hand. (See Zephyr OS for example).
+  * Allow generating a similar board definition from target JSON files for custom boards.
+  * Make it possible to identify hardware at compile time instead of relying on build tags, as long as this doesn't impact binary size too much.
+
+## Non-goals
+
+  * Provide access to hardware unique to a particular board. A new interface has to be reasonably common, and has to be supported by at least two different boards.
+  * Support custom boards from this package. Only boards that are (or were) actually produced should be supported. This includes dev boards, maker boards, electronic badges, etc.
+
+## License
+
+BSD 2-clause license, see LICENSE.txt for details.

board-badger2040.go

@@ -0,0 +1,139 @@
+//go:build badger2040
+
+package board
+
+import (
+	"machine"
+	"math/bits"
+	"time"
+
+	"tinygo.org/x/drivers"
+	"tinygo.org/x/drivers/pixel"
+	"tinygo.org/x/drivers/uc8151"
+)
+
+const (
+	Name = "badger2040"
+)
+
+var (
+	Power   = dummyBattery{state: UnknownBattery}
+	Sensors = baseSensors{}
+	Display = mainDisplay{}
+	Buttons = &gpioButtons{}
+)
+
+type mainDisplay struct{}
+
+func (d mainDisplay) PPI() int {
+	return 102 // 296px wide display / 2.9 inches wide display
+}
+
+func (d mainDisplay) Configure() Displayer[pixel.Monochrome] {
+	machine.ENABLE_3V3.Configure(machine.PinConfig{Mode: machine.PinOutput})
+	machine.ENABLE_3V3.High()
+
+	machine.SPI0.Configure(machine.SPIConfig{
+		Frequency: 12 * machine.MHz,
+		SCK:       machine.EPD_SCK_PIN,
+		SDO:       machine.EPD_SDO_PIN,
+	})
+
+	display := uc8151.New(machine.SPI0, machine.EPD_CS_PIN, machine.EPD_DC_PIN, machine.EPD_RESET_PIN, machine.EPD_BUSY_PIN)
+	display.Configure(uc8151.Config{
+		Rotation:    drivers.Rotation270,
+		Speed:       uc8151.TURBO,
+		FlickerFree: true,
+		Blocking:    false,
+	})
+
+	display.ClearDisplay()
+
+	return &display
+}
+
+func (d mainDisplay) MaxBrightness() int {
+	return 1
+}
+
+func (d mainDisplay) SetBrightness(level int) {
+	// Nothing to do here.
+}
+
+func (d mainDisplay) WaitForVBlank(defaultInterval time.Duration) {
+	dummyWaitForVBlank(defaultInterval)
+}
+
+func (d mainDisplay) ConfigureTouch() TouchInput {
+	return noTouch{}
+}
+
+type gpioButtons struct {
+	state         uint8
+	previousState uint8
+}
+
+func (b *gpioButtons) Configure() {
+	machine.BUTTON_A.Configure(machine.PinConfig{Mode: machine.PinInput})
+	machine.BUTTON_B.Configure(machine.PinConfig{Mode: machine.PinInput})
+	machine.BUTTON_C.Configure(machine.PinConfig{Mode: machine.PinInput})
+	machine.BUTTON_UP.Configure(machine.PinConfig{Mode: machine.PinInput})
+	machine.BUTTON_DOWN.Configure(machine.PinConfig{Mode: machine.PinInput})
+	machine.BUTTON_USER.Configure(machine.PinConfig{Mode: machine.PinInput})
+}
+
+func (b *gpioButtons) ReadInput() {
+	state := uint8(0)
+	if !machine.BUTTON_A.Get() {
+		state |= 1
+	}
+	if !machine.BUTTON_B.Get() {
+		state |= 2
+	}
+	if !machine.BUTTON_C.Get() {
+		state |= 4
+	}
+	if !machine.BUTTON_UP.Get() {
+		state |= 8
+	}
+	if !machine.BUTTON_DOWN.Get() {
+		state |= 16
+	}
+	if !machine.BUTTON_USER.Get() {
+		state |= 32
+	}
+	b.state = state
+}
+
+var codes = [8]Key{
+	KeyA,
+	KeyB,
+	KeyRight,
+	KeyUp,
+	KeyDown,
+	KeyLeft,
+}
+
+func (b *gpioButtons) NextEvent() KeyEvent {
+	// The xor between the previous state and the current state is the buttons
+	// that changed.
+	change := b.state ^ b.previousState
+	if change == 0 {
+		return NoKeyEvent
+	}
+
+	// Find the index of the button with the lowest index that changed state.
+	index := bits.TrailingZeros32(uint32(change))
+	e := KeyEvent(codes[index])
+	if b.state&(1<<index) == 0 {
+		// The button state change was from 1 to 0, so it was released.
+		e |= keyReleased
+	}
+
+	// This button event was read, so mark it as such.
+	// By toggling the bit, the bit will be set to the value that is currently
+	// in b.state.
+	b.previousState ^= (1 << index)
+
+	return e
+}

board-gameboy-advance.go

@@ -0,0 +1,161 @@
+//go:build gameboyadvance
+
+package board
+
+import (
+	"device/gba"
+	"errors"
+	"math/bits"
+	"runtime/volatile"
+	"time"
+	"unsafe"
+
+	"tinygo.org/x/drivers"
+	"tinygo.org/x/drivers/pixel"
+)
+
+const (
+	Name = "gameboy-advance"
+)
+
+var (
+	Power   = dummyBattery{state: UnknownBattery}
+	Sensors = baseSensors{}
+	Display = mainDisplay{}
+	Buttons = &gbaButtons{}
+)
+
+type mainDisplay struct{}
+
+func (d mainDisplay) PPI() int {
+	return 99
+}
+
+func (d mainDisplay) Configure() Displayer[pixel.RGB555] {
+	// Use video mode 3 (in BG2, a 16bpp bitmap in VRAM) and Enable BG2.
+	gba.DISP.DISPCNT.Set(gba.DISPCNT_BGMODE_3<<gba.DISPCNT_BGMODE_Pos |
+		gba.DISPCNT_SCREENDISPLAY_BG2_ENABLE<<gba.DISPCNT_SCREENDISPLAY_BG2_Pos)
+	return gbaDisplay{}
+}
+
+func (d mainDisplay) MaxBrightness() int {
+	return 0
+}
+
+func (d mainDisplay) SetBrightness(level int) {
+	// The display doesn't have a backlight.
+}
+
+func (d mainDisplay) WaitForVBlank(time.Duration) {
+	// Wait until the VBlank flag is set.
+	// TODO: sleep until the next VBlank instead of busy waiting.
+	// (See VBlankIntrWait)
+	for gba.DISP.DISPSTAT.Get()&(1<<gba.DISPSTAT_VBLANK_Pos) == 0 {
+	}
+}
+
+func (d mainDisplay) ConfigureTouch() TouchInput {
+	return noTouch{}
+}
+
+type gbaDisplay struct{}
+
+var displayFrameBuffer = (*[160 * 240]volatile.Register16)(unsafe.Pointer(uintptr(gba.MEM_VRAM)))
+
+var errOutOfBounds = errors.New("rectangle coordinates outside display area")
+
+const (
+	displayWidth  = 240
+	displayHeight = 160
+)
+
+func (d gbaDisplay) Size() (x, y int16) {
+	return displayWidth, displayHeight
+}
+
+func (d gbaDisplay) Display() error {
+	// Nothing to do here.
+	return nil
+}
+
+func (d gbaDisplay) DrawBitmap(x, y int16, buf pixel.Image[pixel.RGB555]) error {
+	width, height := buf.Size()
+	if x < 0 || y < 0 || int(x)+width > displayWidth || int(y)+height > displayHeight {
+		return errOutOfBounds
+	}
+
+	// TODO: try to do a 4-byte memcpy if possible. That should significantly
+	// speed up the copying of this image.
+	for bufY := 0; bufY < int(height); bufY++ {
+		for bufX := 0; bufX < int(width); bufX++ {
+			val := buf.Get(bufX, bufY)
+			displayFrameBuffer[(int(y)+bufY)*240+int(x)+bufX].Set(uint16(val))
+		}
+	}
+
+	return nil
+}
+
+func (d gbaDisplay) Sleep(sleepEnabled bool) error {
+	return nil // nothign to do here
+}
+
+var errNoRotation = errors.New("error: SetRotation isn't supported")
+
+func (d gbaDisplay) Rotation() drivers.Rotation {
+	return drivers.Rotation0
+}
+
+func (d gbaDisplay) SetRotation(rotation drivers.Rotation) error {
+	return errNoRotation
+}
+
+type gbaButtons struct {
+	state         uint16
+	previousState uint16
+}
+
+func (b *gbaButtons) Configure() {
+	// nothing to configure
+}
+
+func (b *gbaButtons) ReadInput() {
+	b.state = gba.KEY.INPUT.Get() ^ 0x3ff
+}
+
+var codes = [16]Key{
+	KeyA,
+	KeyB,
+	KeySelect,
+	KeyStart,
+	KeyRight,
+	KeyLeft,
+	KeyUp,
+	KeyDown,
+	KeyR,
+	KeyL,
+}
+
+func (b *gbaButtons) NextEvent() KeyEvent {
+	// The xor between the previous state and the current state is the buttons
+	// that changed.
+	change := b.state ^ b.previousState
+	if change == 0 {
+		return NoKeyEvent
+	}
+
+	// Find the index of the button with the lowest index that changed state.
+	index := bits.TrailingZeros32(uint32(change))
+	e := KeyEvent(codes[index])
+	if b.state&(1<<index) == 0 {
+		// The button state change was from 1 to 0, so it was released.
+		e |= keyReleased
+	}
+
+	// This button event was read, so mark it as such.
+	// By toggling the bit, the bit will be set to the value that is currently
+	// in b.state.
+	b.previousState ^= (1 << index)
+
+	return e
+}

board-gopher-badge.go

@@ -0,0 +1,242 @@
+//go:build gopher_badge
+
+package board
+
+import (
+	"machine"
+	"math/bits"
+	"time"
+
+	"tinygo.org/x/drivers"
+	"tinygo.org/x/drivers/lis3dh"
+	"tinygo.org/x/drivers/pixel"
+	"tinygo.org/x/drivers/st7789"
+	"tinygo.org/x/drivers/ws2812"
+)
+
+const (
+	Name = "gopher-badge"
+)
+
+var (
+	Power   = dummyBattery{state: UnknownBattery}
+	Sensors = &allSensors{}
+	Display = mainDisplay{}
+	Buttons = &gpioButtons{}
+)
+
+func init() {
+	AddressableLEDs = &ws2812LEDs{}
+}
+
+type allSensors struct {
+	baseSensors
+	accelX, accelY, accelZ int32
+}
+
+var accel lis3dh.Device
+
+func (s *allSensors) Configure(which drivers.Measurement) error {
+	if which&(drivers.Acceleration|drivers.Temperature) != 0 {
+		machine.I2C0.Configure(machine.I2CConfig{
+			Frequency: 400 * machine.KHz,
+			SCL:       machine.I2C0_SCL_PIN,
+			SDA:       machine.I2C0_SDA_PIN,
+		})
+		accel = lis3dh.New(machine.I2C0)
+		accel.Configure()
+	}
+	return nil
+}
+
+func (s *allSensors) Update(which drivers.Measurement) error {
+	if which&drivers.Acceleration != 0 {
+		var err error
+		s.accelX, s.accelY, s.accelZ, err = accel.ReadAcceleration()
+		if err != nil {
+			return err
+		}
+	}
+	// TODO: read the temperature from the LIS3DH.
+	// I tried reading it uisng machine.ReadTemperature() but it was so
+	// inaccurate that it wasn't even usable (around -23°C in a >25°C room).
+	return nil
+}
+
+func (s *allSensors) Acceleration() (x, y, z int32) {
+	// Adjust accelerometer to match standard axes.
+	x = s.accelX
+	y = -s.accelY
+	z = -s.accelZ
+	return
+}
+
+type mainDisplay struct{}
+
+var display st7789.DeviceOf[pixel.RGB565BE]
+
+func (d mainDisplay) Configure() Displayer[pixel.RGB565BE] {
+	machine.SPI0.Configure(machine.SPIConfig{
+		// Mode 3 appears to be compatible with mode 0, but is slightly
+		// faster: each byte takes 9 clock cycles instead of 10.
+		// TODO: try to eliminate this last bit? Two ideas:
+		//   - use 16-bit transfers, to halve the time the gap takes
+		//   - use PIO, which apparently is able to send data without gap
+		// It would seem like TI mode would be faster (it has no gap), but
+		// it samples data on the falling edge instead of on the rising edge
+		// like the st7789 expects.
+		Mode:      3,
+		SCK:       machine.SPI0_SCK_PIN,
+		SDO:       machine.SPI0_SDO_PIN,
+		SDI:       machine.SPI0_SDI_PIN,
+		Frequency: 62_500_000, // datasheet for st7789 says 16ns (62.5MHz) is the max clock speed
+	})
+
+	display = st7789.NewOf[pixel.RGB565BE](machine.SPI0,
+		machine.TFT_RST,       // TFT_RESET
+		machine.TFT_WRX,       // TFT_DC
+		machine.TFT_CS,        // TFT_CS
+		machine.TFT_BACKLIGHT) // TFT_LITE
+
+	display.Configure(st7789.Config{
+		Rotation: st7789.ROTATION_270,
+		Height:   320,
+
+		// Gamma data obtained from example code provided with the display:
+		// https://www.buydisplay.com/2-4-inch-ips-240x320-tft-lcd-display-capacitive-touch-screen
+		// Without these values, most colors (especially green) don't look right.
+		PVGAMCTRL: []byte{0xF0, 0x00, 0x04, 0x04, 0x04, 0x05, 0x29, 0x33, 0x3E, 0x38, 0x12, 0x12, 0x28, 0x30},
+		NVGAMCTRL: []byte{0xF0, 0x07, 0x0A, 0x0D, 0x0B, 0x07, 0x28, 0x33, 0x3E, 0x36, 0x14, 0x14, 0x29, 0x32},
+	})
+	display.EnableBacklight(false)
+
+	return &display
+}
+
+func (d mainDisplay) MaxBrightness() int {
+	return 1
+}
+
+func (d mainDisplay) SetBrightness(level int) {
+	machine.TFT_BACKLIGHT.Set(level > 0)
+}
+
+func (d mainDisplay) WaitForVBlank(defaultInterval time.Duration) {
+	// Lower the SPI frequency for reading: the ST7789 supports high frequency
+	// writes but reading is much slower.
+	machine.SPI0.SetBaudRate(10_000_000)
+
+	// Wait until the scanline wraps around to 0.
+	// This is also what the TE line does internally.
+	for display.GetScanLine() == 0 {
+	}
+	for display.GetScanLine() != 0 {
+	}
+
+	// Restore old baud rate.
+	machine.SPI0.SetBaudRate(62_500_000)
+}
+
+func (d mainDisplay) PPI() int {
+	return 166 // 320px / (48.96mm / 25.4)
+}
+
+func (d mainDisplay) ConfigureTouch() TouchInput {
+	return noTouch{}
+}
+
+type gpioButtons struct {
+	state         uint8
+	previousState uint8
+}
+
+func (b *gpioButtons) Configure() {
+	machine.BUTTON_A.Configure(machine.PinConfig{Mode: machine.PinInput})
+	machine.BUTTON_B.Configure(machine.PinConfig{Mode: machine.PinInput})
+	machine.BUTTON_UP.Configure(machine.PinConfig{Mode: machine.PinInput})
+	machine.BUTTON_LEFT.Configure(machine.PinConfig{Mode: machine.PinInput})
+	machine.BUTTON_DOWN.Configure(machine.PinConfig{Mode: machine.PinInput})
+	machine.BUTTON_RIGHT.Configure(machine.PinConfig{Mode: machine.PinInput})
+}
+
+func (b *gpioButtons) ReadInput() {
+	state := uint8(0)
+	if !machine.BUTTON_A.Get() {
+		state |= 1
+	}
+	if !machine.BUTTON_B.Get() {
+		state |= 2
+	}
+	if !machine.BUTTON_UP.Get() {
+		state |= 4
+	}
+	if !machine.BUTTON_LEFT.Get() {
+		state |= 8
+	}
+	if !machine.BUTTON_DOWN.Get() {
+		state |= 16
+	}
+	if !machine.BUTTON_RIGHT.Get() {
+		state |= 32
+	}
+	b.state = state
+}
+
+var codes = [8]Key{
+	KeyA,
+	KeyB,
+	KeyUp,
+	KeyLeft,
+	KeyDown,
+	KeyRight,
+}
+
+func (b *gpioButtons) NextEvent() KeyEvent {
+	// The xor between the previous state and the current state is the buttons
+	// that changed.
+	change := b.state ^ b.previousState
+	if change == 0 {
+		return NoKeyEvent
+	}
+
+	// Find the index of the button with the lowest index that changed state.
+	index := bits.TrailingZeros32(uint32(change))
+	e := KeyEvent(codes[index])
+	if b.state&(1<<index) == 0 {
+		// The button state change was from 1 to 0, so it was released.
+		e |= keyReleased
+	}
+
+	// This button event was read, so mark it as such.
+	// By toggling the bit, the bit will be set to the value that is currently
+	// in b.state.
+	b.previousState ^= (1 << index)
+
+	return e
+}
+
+type ws2812LEDs struct {
+	data [2]colorGRB
+}
+
+func (l *ws2812LEDs) Configure() {
+	machine.WS2812.Configure(machine.PinConfig{Mode: machine.PinOutput})
+}
+
+func (l *ws2812LEDs) Len() int {
+	return len(l.data)
+}
+
+func (l *ws2812LEDs) SetRGB(i int, r, g, b uint8) {
+	l.data[i] = colorGRB{
+		R: r,
+		G: g,
+		B: b,
+	}
+}
+
+// Send pixel data to the LEDs.
+func (l *ws2812LEDs) Update() {
+	ws := ws2812.Device{Pin: machine.WS2812}
+	ws.Write(pixelsToBytes(l.data[:]))
+}

board-mch2022.go

@@ -0,0 +1,102 @@
+//go:build mch2022
+
+package board
+
+import (
+	"machine"
+	"time"
+
+	"tinygo.org/x/drivers/ili9341"
+	"tinygo.org/x/drivers/pixel"
+	"tinygo.org/x/drivers/ws2812"
+)
+
+const (
+	Name = "mch2022"
+)
+
+var (
+	Power   = dummyBattery{state: UnknownBattery} // unimplemented
+	Sensors = baseSensors{}
+	Display = mainDisplay{}
+	Buttons = noButtons{}
+)
+
+func init() {
+	AddressableLEDs = &ws2812LEDs{}
+}
+
+type mainDisplay struct{}
+
+func (d mainDisplay) Configure() Displayer[pixel.RGB565BE] {
+	machine.LCD_MODE.Configure(machine.PinConfig{Mode: machine.PinOutput})
+	machine.LCD_MODE.Low()
+
+	machine.SPI2.Configure(machine.SPIConfig{
+		Frequency: 80_000_000, // This is probably overclocking the ILI9341 but it seems to work.
+		SCK:       18,
+		SDO:       23,
+		SDI:       35,
+	})
+
+	display := ili9341.NewSPI(machine.SPI2, machine.LCD_DC, machine.SPI0_CS_LCD_PIN, machine.LCD_RESET)
+	display.Configure(ili9341.Config{
+		Rotation: ili9341.Rotation90,
+	})
+
+	return display
+}
+
+func (d mainDisplay) MaxBrightness() int {
+	return 0
+}
+
+func (d mainDisplay) SetBrightness(level int) {
+	// Brightness is controlled by the rp2040 chip.
+}
+
+func (d mainDisplay) WaitForVBlank(defaultInterval time.Duration) {
+	// The FPGA has a parallel output and can probably do tear-free updates, but
+	// not the ESP32.
+	dummyWaitForVBlank(defaultInterval)
+}
+
+func (d mainDisplay) PPI() int {
+	return 166 // 320px / (48.96mm / 25.4)
+}
+
+func (d mainDisplay) ConfigureTouch() TouchInput {
+	return noTouch{}
+}
+
+type ws2812LEDs struct {
+	data [5]colorGRB
+}
+
+func (l *ws2812LEDs) Configure() {
+	// Enable power to the LEDs
+	power := machine.PowerOn
+	power.Configure(machine.PinConfig{Mode: machine.PinOutput})
+	power.High()
+
+	// Initialize the WS2812 data pin.
+	machine.WS2812.Configure(machine.PinConfig{Mode: machine.PinOutput})
+}
+
+func (l *ws2812LEDs) Len() int {
+	return len(l.data)
+}
+
+func (l *ws2812LEDs) SetRGB(i int, r, g, b uint8) {
+	l.data[i] = colorGRB{
+		R: r,
+		G: g,
+		B: b,
+	}
+}
+
+// Send pixel data to the LEDs.
+func (l *ws2812LEDs) Update() {
+	ws := ws2812.Device{Pin: machine.WS2812}
+	ws.Write(pixelsToBytes(l.data[:]))
+}

board-pinetime.go

@@ -0,0 +1,534 @@
+//go:build pinetime
+
+package board
+
+import (
+	"device/arm"
+	"device/nrf"
+	"machine"
+	"time"
+
+	"tinygo.org/x/drivers"
+	"tinygo.org/x/drivers/bma42x"
+	"tinygo.org/x/drivers/pixel"
+	"tinygo.org/x/drivers/st7789"
+)
+
+const (
+	Name = "pinetime"
+
+	touchInterruptPin   = 28
+	spiFlashCSPin       = machine.Pin(5)
+	chargeIndicationPin = machine.Pin(12)
+	vibrationPin        = machine.Pin(16)
+	powerPresencePin    = machine.Pin(19)
+	batteryVoltagePin   = machine.Pin(31)
+)
+
+var (
+	Power   = &mainBattery{}
+	Sensors = allSensors{}
+	Display = mainDisplay{}
+	Buttons = &singleButton{}
+)
+
+func init() {
+	// Enable the DC/DC regulator.
+	// This doesn't affect sleep power consumption, but significantly reduces
+	// runtime power consumpton of the CPU core (almost halving the current
+	// required).
+	nrf.POWER.DCDCEN.Set(nrf.POWER_DCDCEN_DCDCEN)
+
+	// The UART is left enabled in the Wasp-OS bootloader.
+	// This causes a 1.25mA increase in current consumption.
+	// https://github.com/wasp-os/wasp-bootloader/pull/3
+	nrf.UART0.ENABLE.Set(0)
+
+	vibrationPin.Configure(machine.PinConfig{Mode: machine.PinOutput})
+}
+
+type mainBattery struct {
+	lastPercent int8
+	chargePPM   int32
+}
+
+var batteryPercent = batteryApproximation{
+	// Data is taken from this pull request:
+	// https://github.com/InfiniTimeOrg/InfiniTime/pull/1444/files
+	voltages: [6]uint16{3500, 3600, 3700, 3750, 3900, 4180},
+	percents: [6]int8{0, 10, 25, 50, 75, 100},
+}
+
+func (b *mainBattery) Configure() {
+	chargeIndicationPin.Configure(machine.PinConfig{Mode: machine.PinInput})
+	powerPresencePin.Configure(machine.PinConfig{Mode: machine.PinInput})
+
+	// Configure the ADC.
+	// Using just one sample (instead of 256 for example), because we have our
+	// own filtering and long sample times actually drain a lot of power: around
+	// 6µA when measuing the battery every 5 seconds.
+	machine.InitADC()
+	machine.ADC{Pin: batteryVoltagePin}.Configure(machine.ADCConfig{
+		Reference:  3000,
+		SampleTime: 40, // use the longest acquisition time
+		Samples:    1,
+	})
+}
+
+func (b *mainBattery) Status() (status ChargeState, microvolts uint32, percent int8) {
+	rawValue := machine.ADC{Pin: batteryVoltagePin}.Get()
+	// Formula to calculate microvolts:
+	//   rawValue * 6000_000 / 0x10000
+	// Simlified, to fit in 32-bit integers:
+	//   rawValue * (6000_000/128) / (0x1000/128)
+	//   rawValue * 46875 / 512
+	microvolts = uint32(rawValue) * 46875 / 512
+	isCharging := chargeIndicationPin.Get() == false  // low when charging
+	isPowerPresent := powerPresencePin.Get() == false // low when present
+	if isCharging {
+		status = Charging
+	} else if isPowerPresent {
+		status = NotCharging
+	} else {
+		status = Discharging
+	}
+
+	// TODO: percent while charging
+	percentPPM := batteryPercent.approximatePPM(microvolts)
+	if b.chargePPM == 0 {
+		// first measurement, probably
+		b.chargePPM = percentPPM
+	} else {
+		b.chargePPM = (b.chargePPM*255 + percentPPM) / 256
+	}
+	newPercent := b.chargePPM / 10000
+	if newPercent < int32(b.lastPercent) || newPercent > int32(b.lastPercent)+1 {
+		// do some basic hysteresis
+		b.lastPercent = int8(newPercent)
+	}
+	percent = b.lastPercent
+	return
+}
+
+var spi0Configured bool
+
+// Return SPI0 initialized and ready to use, configuring it if not already done.
+func getSPI0() machine.SPI {
+	spi := machine.SPI0
+	if !spi0Configured {
+		// Set the chip select line for the flash chip to inactive.
+		spiFlashCSPin.Configure(machine.PinConfig{Mode: machine.PinOutput})
+		spiFlashCSPin.High()
+
+		// Set the chip select line for the LCD controller to inactive.
+		machine.LCD_CS.Configure(machine.PinConfig{Mode: machine.PinOutput})
+		machine.LCD_CS.High()
+
+		// Configure the SPI bus.
+		spi.Configure(machine.SPIConfig{
+			Frequency: 8_000_000, // 8MHz is the maximum the nrf52832 supports
+			SCK:       machine.SPI0_SCK_PIN,
+			SDO:       machine.SPI0_SDO_PIN,
+			SDI:       machine.SPI0_SDI_PIN,
+			Mode:      3,
+		})
+
+		// Put the flash controller in deep power-down.
+		// This is done so that as long as the SPI flash isn't explicitly
+		// initialized, it won't waste any power.
+		spiFlashCSPin.Low()
+		spi.Tx([]byte{0xB9}, nil) // deep power down
+		spiFlashCSPin.High()
+	}
+	return spi
+}
+
+type mainDisplay struct{}
+
+var display *st7789.DeviceOf[pixel.RGB444BE]
+
+func (d mainDisplay) Configure() Displayer[pixel.RGB444BE] {
+	// Configure the display.
+	// RGB444 reduces theoretic update time by up to 25%, from 115.2ms to 86.4ms
+	// (28.8ms reduction).
+	spi := getSPI0()
+	disp := st7789.NewOf[pixel.RGB444BE](spi,
+		machine.LCD_RESET,
+		machine.LCD_RS, // data/command
+		machine.LCD_CS,
+		machine.LCD_BACKLIGHT_HIGH) // TODO: allow better backlight control
+	disp.Configure(st7789.Config{
+		Width:      240,
+		Height:     240,
+		Rotation:   drivers.Rotation0,
+		RowOffset:  80,
+		FrameRate:  st7789.FRAMERATE_39,
+		VSyncLines: 32, // needed for VBlank, not sure why
+	})
+	disp.EnableBacklight(true) // disable the backlight
+
+	// Initialize these pins as regular pins too, for WaitForVBlank.
+	machine.LCD_SCK.Configure(machine.PinConfig{Mode: machine.PinOutput})
+	machine.LCD_SCK.Low()
+	machine.LCD_SDI.Configure(machine.PinConfig{Mode: machine.PinOutput})
+
+	display = &disp
+	return display
+}
+
+func (d mainDisplay) MaxBrightness() int {
+	return 1 // TODO: 0-7 is supported
+}
+
+func (d mainDisplay) SetBrightness(level int) {
+	machine.LCD_BACKLIGHT_HIGH.Set(!(level > 0)) // low means on, high means off
+}
+
+func (d mainDisplay) WaitForVBlank(defaultInterval time.Duration) {
+	// Disable the SPI so we can manually communicate with the display.
+	machine.SPI0.Bus.ENABLE.Set(nrf.SPIM_ENABLE_ENABLE_Disabled)
+
+	// Wait until the scanline wraps around to 0.
+	// This is also what the TE line does internally.
+	// TODO: use time.Sleep() if we can, to save power.
+	for readDisplayValue(st7789.GSCAN, 16) == 0 {
+	}
+	for readDisplayValue(st7789.GSCAN, 16) != 0 {
+	}
+
+	// Re-enable the SPI.
+	machine.SPI0.Bus.ENABLE.Set(nrf.SPIM_ENABLE_ENABLE_Enabled)
+}
+
+// Wait for enough time between bitbanged high and low SPI pulses.
+func delaySPIClock() {
+	// 4 cycles, or 62.5ns.
+	// Together with the store, it is 6 cycles or 93.75ns.
+	arm.Asm("nop\nnop\nnop\nnop")
+}
+
+// Read a single value from the display, for example GSCAN, RDDID, etc.
+// The bits parameter indicates the number of bits that will be received.
+func readDisplayValue(cmd uint8, bits int) uint32 {
+	const (
+		cs  = machine.LCD_CS
+		dc  = machine.LCD_RS
+		sdi = machine.LCD_SDI
+		sck = machine.LCD_SCK
+	)
+
+	// Initialize bitbanged SPI.
+	delaySPIClock()
+	cs.Low()
+	dc.Low()
+	sdi.Configure(machine.PinConfig{Mode: machine.PinOutput})
+
+	// Clock out the command.
+	for i := 0; i < 8; i++ {
+		sdi.Set(cmd&0x80 != 0)
+		delaySPIClock()
+		sck.High()
+		delaySPIClock()
+		sck.Low()
+		cmd <<= 1
+	}
+	delaySPIClock()
+
+	// Dummy clock cycle (necessary for 24-bit and 32-bit read commands,
+	// according to the datasheet).
+	if bits >= 24 {
+		sck.High()
+		delaySPIClock()
+		sck.Low()
+		delaySPIClock()
+	}
+
+	// Read the result over SPI.
+	sdi.Configure(machine.PinConfig{Mode: machine.PinInputPulldown})
+	dc.High()
+	value := uint32(0)
+	for i := 0; i < bits; i++ {
+		sck.High()
+		delaySPIClock()
+		value <<= 1
+		if sdi.Get() {
+			value |= 1
+		}
+		sck.Low()
+		delaySPIClock()
+	}
+
+	// Dummy clock cycle, according to the datasheet needed in all cases but in
+	// my exprience only needed for 16-bit reads (GSCAN).
+	if bits == 16 {
+		sck.High()
+		delaySPIClock()
+		sck.Low()
+		delaySPIClock()
+	}
+
+	// Finish the transaction.
+	cs.High()
+	dc.High()
+
+	return value
+}
+
+func (d mainDisplay) PPI() int {
+	return 261
+}
+
+func (d mainDisplay) ConfigureTouch() TouchInput {
+	// Configure touch interrupt pin.
+	// After the pin goes low (for a very short time), the touch controller is
+	// accessible over I2C for as long as a finger touches the screen and a
+	// short time afterwards (a second or so) before going back to sleep.
+	//
+	// We don't actually use an interrupt here because pin change interrupts
+	// result in far too much current consumption (jumping from 0.19mA to
+	// 0.65mA), probably due to anomaly 97:
+	// https://infocenter.nordicsemi.com/index.jsp?topic=%2Ferrata_nRF52832_Rev2%2FERR%2FnRF52832%2FRev2%2Flatest%2Fanomaly_832_97.html
+	// Also see:
+	// https://devzone.nordicsemi.com/f/nordic-q-a/50624/about-current-consumption-of-gpio-and-gpiote
+	// We could use a PORT interrupt in GPIOTE, using it as a level interrupt.
+	// And it would be a good idea to implement this in TinyGo directly (as a
+	// level interrupt), but in the meantime we'll use this quick-n-dirty hack.
+	nrf.P0.PIN_CNF[touchInterruptPin].Set(nrf.GPIO_PIN_CNF_DIR_Input<<nrf.GPIO_PIN_CNF_DIR_Pos | nrf.GPIO_PIN_CNF_INPUT_Connect<<nrf.GPIO_PIN_CNF_INPUT_Pos | nrf.GPIO_PIN_CNF_SENSE_Low<<nrf.GPIO_PIN_CNF_SENSE_Pos)
+
+	configureI2CBus()
+
+	return touchInput{}
+}
+
+var touchPoints [1]TouchPoint
+
+type touchInput struct{}
+
+var touchID uint32 = 1
+
+var touchData = make([]byte, 6)
+
+var touchInitialized bool
+
+const touchI2CAddress = 0x15
+
+func (input touchInput) ReadTouch() []TouchPoint {
+	// The touch controller is very sparsely documented. You can find datasheet
+	// in English and Chinese on the PineTime wiki:
+	// https://wiki.pine64.org/wiki/PineTime#Component_Datasheets
+	// The best documentation is in the Chinese documentation, you can use
+	// Google Translate to translate it to English.
+
+	// Read the bit from the LATCH reister, which is set to high when TP_INT
+	// goes high but doesn't go low on its own. We do that manually once no more
+	// touches are read from the touch controller.
+	if nrf.P0.LATCH.Get()&(1<<touchInterruptPin) != 0 {
+		if !touchInitialized {
+			// Initialize the touch controller once we get the first touch.
+			// Doing it this way as the I2C bus appears unresponsive outside a
+			// touch event.
+			touchInitialized = true
+
+			// These are the values as set by InfiniTime.
+			//     i2cBus.Tx(touchI2CAddress, []byte{0xEC, 0b00000101}, nil)
+			//     i2cBus.Tx(touchI2CAddress, []byte{0xFA, 0b01110000}, nil)
+
+			// MotionMask register:
+			//   [0] EnDClick (disabled, enabled in InfiniTime)
+			//   [1] EnConUD  (disabled)
+			//   [2] EnConLR  (enabled)
+			i2cBus.Tx(touchI2CAddress, []byte{0xEC, 0b0000_0100}, nil)
+
+			// IrqCtl register:
+			//   [7] EnTest   (disabled)
+			//   [6] EnTouch  (enabled)
+			//   [5] EnChange (enabled)
+			//   [4] EnMotion (enabled)
+			//   [0] OnceWLP  (disabled)
+			i2cBus.Tx(touchI2CAddress, []byte{0xFA, 0b0111_0000}, nil)
+		}
+
+		i2cBus.ReadRegister(touchI2CAddress, 1, touchData)
+		num := touchData[1] & 0x0f
+		if num == 0 {
+			touchID++ // for the next time
+			// Stop reading touch events.
+			// There may be a small race condition here, if the touch controller
+			// detects another touch while reading the touch data over I2C.
+			nrf.P0.LATCH.Set(1 << touchInterruptPin)
+			touchPoints[0].ID = 0
+			return nil
+		}
+		rawX := (uint16(touchData[2]&0xf) << 8) | uint16(touchData[3]) // x coord
+		rawY := (uint16(touchData[4]&0xf) << 8) | uint16(touchData[5]) // y coord
+		// Filter out erroneous data.
+		if rawX >= 240 || rawY >= 240 {
+			// X or Y are erroneous (this happens quite frequently).
+			// Just return the previous value as a fallback.
+			if touchPoints[0].ID != 0 {
+				return touchPoints[:1]
+			}
+			return nil
+		}
+		x := int16(rawX)
+		y := int16(rawY)
+		if display != nil {
+			// The screen is upside down from the configured rotation, so also
+			// rotate the touch coordinates.
+			if display.Rotation() == drivers.Rotation180 {
+				x = 239 - x
+				y = 239 - y
+			}
+		}
+		touchPoints[0] = TouchPoint{
+			X:  x,
+			Y:  y,
+			ID: touchID,
+		}
+		return touchPoints[:1]
+	}
+	return nil
+}
+
+// State for the one and only button on the PineTime.
+type singleButton struct {
+	state         bool
+	previousState bool
+}
+
+func (b *singleButton) Configure() {
+	// BUTTON_OUT must be held high for BUTTON_IN to read anything useful.
+	machine.BUTTON_OUT.Configure(machine.PinConfig{Mode: machine.PinOutput})
+	machine.BUTTON_OUT.Low()
+	machine.BUTTON_IN.Configure(machine.PinConfig{Mode: machine.PinInput})
+}
+
+func (b *singleButton) ReadInput() {
+	// BUTTON_OUT needs to be kept low most of the time to avoid a ~34µA current
+	// increase. However, setting it to high just before reading doesn't appear
+	// to be enough: a small delay is needed. This can be done by setting
+	// BUTTON_OUT high multiple times in a row, which doesn't do anything except
+	// introduce the needed delay.
+	// Four stores appear to be enough to get readings, I have added a few more
+	// for more reliable readings (especially as this is important for the
+	// watchdog timer).
+	machine.BUTTON_OUT.High()
+	machine.BUTTON_OUT.High()
+	machine.BUTTON_OUT.High()
+	machine.BUTTON_OUT.High()
+	machine.BUTTON_OUT.High()
+	machine.BUTTON_OUT.High()
+	machine.BUTTON_OUT.High()
+	machine.BUTTON_OUT.High()
+	state := machine.BUTTON_IN.Get()
+	machine.BUTTON_OUT.Low()
+	b.state = state
+
+	// Reset the watchdog timer only when the button is not pressed.
+	// The watchdog is configured in the Wasp-OS bootloader, and we have to be
+	// careful not to reset the watchdog while the button is pressed so that a
+	// long press forces a WDT reset and lets us enter the bootloader.
+	// For details, see:
+	// https://wasp-os.readthedocs.io/en/latest/wasp.html#watchdog-protocol
+	if !state {
+		nrf.WDT.RR[0].Set(0x6E524635)
+	}
+}
+
+func (b *singleButton) NextEvent() KeyEvent {
+	if b.state == b.previousState {
+		return NoKeyEvent
+	}
+	e := KeyEvent(KeyEnter)
+	if !b.state {
+		e |= keyReleased
+	}
+	b.previousState = b.state
+	return e
+}
+
+var i2cBus *machine.I2C
+
+func initI2CBus() {
+	// Run I2C at a high speed (400KHz).
+	i2cBus.Configure(machine.I2CConfig{
+		Frequency: 400 * machine.KHz,
+		SDA:       machine.Pin(6),
+		SCL:       machine.Pin(7),
+	})
+}
+
+func configureI2CBus() {
+	if i2cBus == nil {
+		i2cBus = machine.I2C1
+		initI2CBus()
+
+		// Disable the heart rate sensor on startup, to be enabled when a driver
+		// configures it. It consumes around 110µA when left enabled.
+		machine.I2C1.WriteRegister(0x44, 0x0C, []byte{0x00})
+	}
+}
+
+type allSensors struct {
+}
+
+var accel *bma42x.Device
+
+func (s allSensors) Configure(which drivers.Measurement) error {
+	// Configure the accelerometer (either BMA421 or BMA425, depending on the
+	// PineTime variant).
+	accel = bma42x.NewI2C(machine.I2C1, bma42x.Address)
+	err := accel.Configure(bma42x.Config{
+		Device:   bma42x.DeviceBMA421 | bma42x.DeviceBMA425,
+		Features: bma42x.FeatureStepCounting,
+	})
+	if err != nil {
+		// Restart the I2C bus.
+		// I don't know why, but configuring the BMA421 while it is already
+		// configured freezes the I2C bus. The only recovery appears to be to
+		// restart the I2C bus entirely.
+		initI2CBus()
+		err = accel.Configure(bma42x.Config{
+			Device:   bma42x.DeviceBMA421 | bma42x.DeviceBMA425,
+			Features: bma42x.FeatureStepCounting,
+		})
+	}
+	return err
+}
+
+func (s allSensors) Update(which drivers.Measurement) error {
+	if which&(drivers.Acceleration|drivers.Temperature) != 0 {
+		err := accel.Update(which & (drivers.Acceleration | drivers.Temperature))
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (s allSensors) Acceleration() (x, y, z int32) {
+	rawX, rawY, rawZ := accel.Acceleration()
+	// Adjust accelerometer to match standard axes.
+	x = -rawY
+	y = -rawX
+	z = -rawZ
+	return
+}
+
+func (s allSensors) Steps() (steps uint32) {
+	return accel.Steps()
+}
+
+func (s allSensors) Temperature() int32 {
+	return accel.Temperature()
+}
+
+type Vibro struct{}
+
+func (Vibro) High() {
+	vibrationPin.High()
+}
+
+func (Vibro) Low() {
+	vibrationPin.Low()
+}

board-pybadge.go

@@ -0,0 +1,206 @@
+//go:build pybadge
+
+package board
+
+import (
+	"machine"
+	"math/bits"
+	"time"
+
+	"tinygo.org/x/drivers"
+	"tinygo.org/x/drivers/lis3dh"
+	"tinygo.org/x/drivers/pixel"
+	"tinygo.org/x/drivers/shifter"
+	"tinygo.org/x/drivers/st7735"
+	"tinygo.org/x/drivers/ws2812"
+)
+
+const (
+	Name = "pybadge"
+)
+
+var (
+	Power   = mainBattery{}
+	Sensors = &allSensors{}
+	Display = mainDisplay{}
+	Buttons = &buttonsConfig{}
+)
+
+func init() {
+	AddressableLEDs = &ws2812LEDs{}
+}
+
+type mainBattery struct {
+}
+
+func (b mainBattery) Configure() {
+	machine.InitADC()
+	machine.ADC{Pin: machine.A6}.Configure(machine.ADCConfig{
+		Samples: 4, // 4 seems to be good enough
+	})
+}
+
+func (b mainBattery) Status() (ChargeState, uint32, int8) {
+	rawValue := machine.ADC{Pin: machine.A6}.Get()
+	// Formula to calculate microvolts:
+	//   rawValue * 6600_000 / 0x10000
+	// Simlified, to fit in 32-bit integers:
+	//   rawValue * 51562 / 512
+	microvolts := uint32(rawValue) * 51562 / 512
+	return UnknownBattery, microvolts, lithumBatteryApproximation.approximate(microvolts)
+}
+
+type allSensors struct {
+	baseSensors
+	accelX, accelY, accelZ int32
+}
+
+var accel lis3dh.Device
+
+func (s *allSensors) Configure(which drivers.Measurement) error {
+	if which&drivers.Acceleration != 0 {
+		machine.I2C0.Configure(machine.I2CConfig{
+			Frequency: 400 * machine.KHz,
+			SCL:       machine.SCL_PIN,
+			SDA:       machine.SDA_PIN,
+		})
+		accel = lis3dh.New(machine.I2C0)
+		accel.Configure()
+	}
+	return nil
+}
+
+func (s *allSensors) Update(which drivers.Measurement) error {
+	// TODO:
+	// - read temperature from LIS3DH
+	// - read brightness value
+	if which&drivers.Acceleration != 0 {
+		var err error
+		s.accelX, s.accelY, s.accelZ, err = accel.ReadAcceleration()
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (s *allSensors) Acceleration() (x, y, z int32) {
+	// Adjust accelerometer to match standard axes.
+	x = -s.accelX
+	y = s.accelY
+	z = -s.accelZ
+	return
+}
+
+type mainDisplay struct{}
+
+func (d mainDisplay) PPI() int {
+	return 116 // 160px / (35.04mm / 25.4)
+}
+
+func (d mainDisplay) Configure() Displayer[pixel.RGB565BE] {
+	machine.SPI1.Configure(machine.SPIConfig{
+		SCK:       machine.SPI1_SCK_PIN,
+		SDO:       machine.SPI1_SDO_PIN,
+		SDI:       machine.SPI1_SDI_PIN,
+		Frequency: 15_000_000, // datasheet for st7735 says 66ns (~15.15MHz) is the max speed
+	})
+
+	display := st7735.New(machine.SPI1, machine.TFT_RST, machine.TFT_DC, machine.TFT_CS, machine.TFT_LITE)
+	display.Configure(st7735.Config{
+		Rotation: st7735.ROTATION_90,
+	})
+	display.EnableBacklight(false)
+	return &display
+}
+
+func (d mainDisplay) MaxBrightness() int {
+	return 1
+}
+
+func (d mainDisplay) SetBrightness(level int) {
+	machine.TFT_LITE.Set(level > 0)
+}
+
+func (d mainDisplay) WaitForVBlank(defaultInterval time.Duration) {
+	dummyWaitForVBlank(defaultInterval)
+}
+
+func (d mainDisplay) ConfigureTouch() TouchInput {
+	return noTouch{}
+}
+
+type buttonsConfig struct {
+	shifter.Device
+	lastState, currentState uint8
+}
+
+func (b *buttonsConfig) Configure() {
+	b.Device = shifter.NewButtons()
+	b.Device.Configure()
+}
+
+func (b *buttonsConfig) ReadInput() {
+	b.currentState, _ = b.Device.ReadInput()
+}
+
+var codes = [8]Key{
+	KeyLeft,
+	KeyUp,
+	KeyDown,
+	KeyRight,
+	KeySelect,
+	KeyStart,
+	KeyA,
+	KeyB,
+}
+
+func (b *buttonsConfig) NextEvent() KeyEvent {
+	// The xor between the previous state and the current state is the buttons
+	// that changed.
+	change := b.currentState ^ b.lastState
+	if change == 0 {
+		return NoKeyEvent
+	}
+
+	// Find the index of the button with the lowest index that changed state.
+	index := bits.TrailingZeros32(uint32(change))
+	e := KeyEvent(codes[index])
+	if b.currentState&(1<<index) == 0 {
+		// The button state change was from 1 to 0, so it was released.
+		e |= keyReleased
+	}
+
+	// This button event was read, so mark it as such.
+	// By toggling the bit, the bit will be set to the value that is currently
+	// in currentState.
+	b.lastState ^= (1 << index)
+
+	return e
+}
+
+type ws2812LEDs struct {
+	data [5]colorGRB
+}
+
+func (l *ws2812LEDs) Configure() {
+	machine.WS2812.Configure(machine.PinConfig{Mode: machine.PinOutput})
+}
+
+func (l *ws2812LEDs) Len() int {
+	return len(l.data)
+}
+
+func (l *ws2812LEDs) SetRGB(i int, r, g, b uint8) {
+	l.data[i] = colorGRB{
+		R: r,
+		G: g,
+		B: b,
+	}
+}
+
+// Send pixel data to the LEDs.
+func (l *ws2812LEDs) Update() {
+	ws := ws2812.Device{Pin: machine.WS2812}
+	ws.Write(pixelsToBytes(l.data[:]))
+}

board-pyportal.go

@@ -0,0 +1,257 @@
+//go:build pyportal
+
+package board
+
+import (
+	"machine"
+	"time"
+
+	"tinygo.org/x/drivers"
+	"tinygo.org/x/drivers/ili9341"
+	"tinygo.org/x/drivers/pixel"
+	"tinygo.org/x/drivers/touch/resistive"
+)
+
+const (
+	Name = "pyportal"
+)
+
+var (
+	Power   = dummyBattery{state: NoBattery}
+	Sensors = baseSensors{} // TODO: light, temperature
+	Display = mainDisplay{}
+	Buttons = noButtons{}
+)
+
+type mainDisplay struct{}
+
+var display *ili9341.Device
+
+func (d mainDisplay) Configure() Displayer[pixel.RGB565BE] {
+	// Initialize backlight and disable at startup.
+	backlight := machine.TFT_BACKLIGHT
+	backlight.Configure(machine.PinConfig{Mode: machine.PinOutput})
+	backlight.Low()
+
+	// Enable and configure display.
+	display = ili9341.NewParallel(
+		machine.LCD_DATA0,
+		machine.TFT_WR,
+		machine.TFT_DC,
+		machine.TFT_CS,
+		machine.TFT_RESET,
+		machine.TFT_RD,
+	)
+	display.Configure(ili9341.Config{
+		Rotation: ili9341.Rotation270,
+	})
+
+	// Enable the TE ("tearing effect") pin to read vblank status.
+	te := machine.TFT_TE
+	te.Configure(machine.PinConfig{Mode: machine.PinInput})
+	display.EnableTEOutput(true)
+
+	return display
+}
+
+func (d mainDisplay) MaxBrightness() int {
+	return 1
+}
+
+func (d mainDisplay) SetBrightness(level int) {
+	machine.TFT_BACKLIGHT.Set(level > 0)
+}
+
+func (d mainDisplay) WaitForVBlank(defaultInterval time.Duration) {
+	// Wait until the display has finished updating.
+	// TODO: wait for a pin interrupt instead of blocking.
+	for machine.TFT_TE.Get() == true {
+	}
+	for machine.TFT_TE.Get() == false {
+	}
+
+}
+
+func (d mainDisplay) PPI() int {
+	return 166 // appears to be the same size/resolution as the Gopher Badge and the MCH2022 badge
+}
+
+// Configure the resistive touch input on this display.
+func (d mainDisplay) ConfigureTouch() TouchInput {
+	machine.InitADC()
+	resistiveTouch.Configure(&resistive.FourWireConfig{
+		YP: machine.TOUCH_YD,
+		YM: machine.TOUCH_YU,
+		XP: machine.TOUCH_XR,
+		XM: machine.TOUCH_XL,
+	})
+
+	return touchInput{}
+}
+
+var resistiveTouch resistive.FourWire
+
+var touchPoints [1]TouchPoint
+
+type touchInput struct{}
+
+var touchID uint32
+
+// State associated with the touch input.
+var (
+	medianFilterX, medianFilterY medianFilter
+	iirFilterX, iirFilterY       iirFilter
+	lastPosX, lastPosY           int
+)
+
+func (input touchInput) ReadTouch() []TouchPoint {
+	// Values calibrated on the PyPortal I have. Other boards might have
+	// slightly different values.
+	// TODO: make this configurable?
+	const (
+		xmin = 54000
+		xmax = 16000
+		ymin = 48000
+		ymax = 22000
+	)
+	point := resistiveTouch.ReadTouchPoint()
+	if point.Z > 8192 {
+		medianFilterX.add(point.X)
+		medianFilterY.add(point.Y)
+		var posX, posY int
+		if touchPoints[0].ID == 0 {
+			// First touch on the touch screen.
+			touchID++
+			touchPoints[0].ID = touchID
+			for i := 0; i < 4; i++ {
+				// Initialize the median filter at this point with some more
+				// samples, so that the entire median filter is filled.
+				point := resistiveTouch.ReadTouchPoint()
+				medianFilterX.add(point.X)
+				medianFilterY.add(point.Y)
+			}
+			// Reset the IIR filter, and use the position as-is.
+			iirFilterX.add(medianFilterX.value(), true)
+			iirFilterY.add(medianFilterY.value(), true)
+			posX = iirFilterX.value()
+			posY = iirFilterY.value()
+		} else {
+			// New touch value while we were touching before.
+			// Add the value to the IIR filter.
+			iirFilterX.add(medianFilterX.value(), false)
+			iirFilterY.add(medianFilterY.value(), false)
+			// Use some hysteresis to avoid moving the point when it didn't
+			// actually move.
+			posX = lastPosX
+			posY = lastPosY
+			const diff = 400 // arbitrary value that appears to work well
+			if iirFilterX.value() > lastPosX+diff {
+				posX = iirFilterX.value() - diff
+			}
+			if iirFilterX.value() < lastPosX-diff {
+				posX = iirFilterX.value() + diff
+			}
+			if iirFilterY.value() > lastPosY+diff {
+				posY = iirFilterY.value() - diff
+			}
+			if iirFilterY.value() < lastPosY-diff {
+				posY = iirFilterY.value() + diff
+			}
+		}
+		lastPosX = posX
+		lastPosY = posY
+		x := int16(clamp(posX, ymin, ymax, 0, 239))
+		y := int16(clamp(posY, xmin, xmax, 0, 319))
+		if display != nil {
+			// Adjust for screen rotation.
+			switch display.Rotation() {
+			case drivers.Rotation90:
+				x, y = y, 239-x
+			case drivers.Rotation180:
+				x = 239 - x
+				y = 319 - y
+			case drivers.Rotation270:
+				x, y = 319-y, x
+			}
+		}
+		touchPoints[0].Y = y
+		touchPoints[0].X = x
+		return touchPoints[:1]
+	} else {
+		touchPoints[0].ID = 0
+	}
+	return nil
+}
+
+// Map and clamp an input value to an output range.
+func clamp(value, lowIn, highIn, lowOut, highOut int) int {
+	rangeIn := highIn - lowIn
+	rangeOut := highOut - lowOut
+	valueOut := (value - lowIn) * rangeOut / rangeIn
+	if valueOut > highOut {
+		valueOut = highOut
+	}
+	if valueOut < lowOut {
+		valueOut = lowOut
+	}
+	return valueOut
+}
+
+// Touch screen filtering has been implemented using the description in this
+// article:
+// https://dlbeer.co.nz/articles/tsf.html
+// It works a lot better than the rather naive algorithm I implemented before.
+
+type medianFilter [5]int
+
+func (f *medianFilter) add(n int) {
+	// Shift the value into the array.
+	f[0] = f[1]
+	f[1] = f[2]
+	f[2] = f[3]
+	f[3] = f[4]
+	f[4] = n
+}
+
+func (f *medianFilter) value() int {
+	// Optimal sorting algorithm.
+	// It is based on the sorting algorithm described here:
+	// https://bertdobbelaere.github.io/sorting_networks.html
+	sorted := *f
+	compareSwap := func(a, b *int) {
+		if *a > *b {
+			*b, *a = *a, *b
+		}
+	}
+	compareSwap(&sorted[1], &sorted[4])
+	compareSwap(&sorted[0], &sorted[3])
+	compareSwap(&sorted[1], &sorted[3])
+	compareSwap(&sorted[0], &sorted[2])
+	compareSwap(&sorted[2], &sorted[4])
+	compareSwap(&sorted[0], &sorted[1])
+	compareSwap(&sorted[1], &sorted[2])
+	compareSwap(&sorted[3], &sorted[4])
+	compareSwap(&sorted[2], &sorted[3])
+
+	// Return the median value.
+	return sorted[2]
+}
+
+// Infinite impulse response filter, to smooth the input values somewhat.
+type iirFilter struct {
+	state int
+}
+
+func (f *iirFilter) add(x int, reset bool) {
+	if reset {
+		f.state = x
+	}
+	// For every update, the new value is half of x and half of the old value,
+	// added together:
+	//   f.state = f.state*0.5 + x*0.5
+	f.state = (f.state + x + 1) / 2
+}
+
+func (f *iirFilter) value() int {
+	return f.state
+}

board-simulator.go

@@ -0,0 +1,493 @@
+//go:build !baremetal
+
+package board
+
+// The generic board exists for testing locally without running on real
+// hardware. This avoids potentially long edit-flash-test cycles.
+
+import (
+	"bufio"
+	"errors"
+	"fmt"
+	"io"
+	"math/rand"
+	"os"
+	"os/exec"
+	"strings"
+	"sync"
+	"time"
+
+	"tinygo.org/x/drivers"
+	"tinygo.org/x/drivers/pixel"
+)
+
+const (
+	// The board name, as passed to TinyGo in the "-target" flag.
+	// This is the special name "simulator" for the simulator.
+	Name = "simulator"
+)
+
+// List of all devices.
+//
+// Support varies by board, but all boards have the following peripherals
+// defined.
+var (
+	Power   = simulatedPower{}
+	Sensors = &simulatedSensors{}
+	Display = mainDisplay{}
+	Buttons = buttonsConfig{}
+)
+
+func init() {
+	AddressableLEDs = &simulatedLEDs{}
+}
+
+type simulatedPower struct{}
+
+// Configure the battery status reader. This must be called before calling
+// Status.
+func (p simulatedPower) Configure() {
+	// Nothing to do here.
+}
+
+// Status returns the current charge status (charging, discharging) and the
+// current voltage of the battery in microvolts. If the voltage is 0 it means
+// there is no battery present, any other value means a value was read from the
+// battery (but there may or may not be a battery attached).
+//
+// The percent is a rough approximation of the state of charge of the battery.
+// The value -1 means the state of charge is unknown.
+// It is often inaccurate while charging. It may be best to just show "charging"
+// instead of a specific percentage.
+func (p simulatedPower) Status() (state ChargeState, microvolts uint32, percent int8) {
+	// Pretend we're running on battery power and the battery is at 3.7V
+	// (typical lipo voltage).
+	actualMicrovolts := uint32(3700_000)
+	// Randomize the output a bit to fake ADC noise (programs should be able to
+	// deal with that).
+	microvolts = actualMicrovolts + rand.Uint32()%16384 - 8192
+	// Use a stable percent though, otherwise BLE battery level notifications
+	// will fluctuate way too much.
+	percent = lithumBatteryApproximation.approximate(actualMicrovolts)
+	return Discharging, microvolts, percent
+}
+
+type mainDisplay struct{}
+
+type fyneScreen struct {
+	width         int
+	height        int
+	keyevents     []KeyEvent
+	keyeventsLock sync.Mutex
+	touchID       uint32
+	touches       [1]TouchPoint
+	touchesLock   sync.Mutex
+}
+
+var screen = &fyneScreen{}
+
+// Configure returns a new display ready to draw on.
+//
+// Boards without a display will return nil.
+func (d mainDisplay) Configure() Displayer[pixel.RGB888] {
+	startWindow()
+	screen.width = Simulator.WindowWidth
+	screen.height = Simulator.WindowHeight
+	windowSendCommand(fmt.Sprintf("display %d %d", screen.width, screen.height), nil)
+	return screen
+}
+
+// MaxBrightness returns the maximum brightness value. A maximum brightness
+// value of 0 means that this display doesn't support changing the brightness.
+func (d mainDisplay) MaxBrightness() int {
+	return 1
+}
+
+// SetBrightness sets brightness level of the display. It should be:
+//
+//	0 ≤ level ≤ MaxBrightness
+//
+// A value of 0 turns the backlight off entirely (but may leave the display
+// running with nothing visible).
+func (d mainDisplay) SetBrightness(level int) {
+	// Send the current and max brightness levels.
+	windowSendCommand(fmt.Sprintf("display-brightness %d %d", level, 1), nil)
+}
+
+// Wait until the next vertical blanking interval (vblank) interrupt is
+// received. If the vblank interrupt is not available, it waits until the time
+// since the previous call to WaitForVBlank is the default interval instead.
+//
+// The vertical blanking interval is the time between two screen refreshes. The
+// vblank interrupt happens at the start of this interval, and indicates the
+// period where the framebuffer is not being touched and can be updated without
+// tearing.
+//
+// Don't use this method for timing, because vblank varies by hardware. Instead,
+// use time.Now() to determine the current time and the amount of time since the
+// last screen refresh.
+//
+// TODO: this is not a great API (it's blocking), it may change in the future.
+func (d mainDisplay) WaitForVBlank(defaultInterval time.Duration) {
+	// I'm sure there is some SDL2 API we could use here, but I couldn't find
+	// one easily so just emulate it.
+	dummyWaitForVBlank(defaultInterval)
+}
+
+// Pixels per inch for this display.
+func (d mainDisplay) PPI() int {
+	return Simulator.WindowPPI
+}
+
+func (d mainDisplay) ConfigureTouch() TouchInput {
+	startWindow()
+
+	return sdltouch{}
+}
+
+func (s *fyneScreen) Display() error {
+	// Nothing to do here.
+	return nil
+}
+
+func (s *fyneScreen) DrawBitmap(x, y int16, image pixel.Image[pixel.RGB888]) error {
+	displayWidth, displayHeight := s.Size()
+	width, height := image.Size()
+	if x < 0 || y < 0 || width <= 0 || height <= 0 ||
+		int(x)+width > int(displayWidth) || int(y)+height > int(displayHeight) {
+		return errors.New("board: drawing out of bounds")
+	}
+	buf := image.RawBuffer()
+	drawStart := time.Now()
+	lastUpdate := drawStart
+	for bufy := 0; bufy < int(height); bufy++ {
+		// Delay drawing a bit, to simulate a slow SPI bus.
+		if Simulator.WindowDrawSpeed != 0 {
+			now := time.Now()
+			expected := drawStart.Add(Simulator.WindowDrawSpeed * time.Duration(bufy*int(width)))
+			delay := expected.Sub(now)
+			if delay > 0 {
+				time.Sleep(delay)
+				now = time.Now()
+			}
+
+			if now.Sub(lastUpdate) > 5*time.Millisecond {
+				lastUpdate = now
+			}
+		}
+
+		index := (bufy * int(width)) * 3
+		lineBuf := buf[index : index+int(width)*3]
+		windowSendCommand(fmt.Sprintf("draw %d %d %d", x, int(y)+bufy, width), lineBuf)
+	}
+	return nil
+}
+
+func (s *fyneScreen) Size() (width, height int16) {
+	return int16(s.width), int16(s.height)
+}
+
+// Set sleep mode for this screen.
+func (s *fyneScreen) Sleep(sleepEnabled bool) error {
+	// This is a no-op.
+	// TODO: use a different gray than when the backlight is set to zero, to
+	// indicate sleep mode.
+	return nil
+}
+
+var errNoRotation = errors.New("error: SetRotation isn't supported")
+
+func (s *fyneScreen) Rotation() drivers.Rotation {
+	return drivers.Rotation0
+}
+
+func (s *fyneScreen) SetRotation(rotation drivers.Rotation) error {
+	// TODO: implement this, to be able to test rotation support.
+	return errNoRotation
+}
+
+func (s *fyneScreen) SetScrollArea(topFixedArea, bottomFixedArea int16) {
+	windowSendCommand(fmt.Sprintf("scroll-start %d %d", topFixedArea, bottomFixedArea), nil)
+}
+
+func (s *fyneScreen) SetScroll(line int16) {
+	windowSendCommand(fmt.Sprintf("scroll %d", line), nil)
+}
+
+func (s *fyneScreen) StopScroll() {
+	windowSendCommand(fmt.Sprintf("scroll-stop"), nil)
+}
+
+type sdltouch struct{}
+
+func (s sdltouch) ReadTouch() []TouchPoint {
+	screen.touchesLock.Lock()
+	defer screen.touchesLock.Unlock()
+
+	if screen.touches[0].ID != 0 {
+		return screen.touches[:1]
+	}
+	return nil
+}
+
+type buttonsConfig struct{}
+
+func (b buttonsConfig) Configure() {
+}
+
+func (b buttonsConfig) ReadInput() {
+}
+
+func (b buttonsConfig) NextEvent() KeyEvent {
+	screen.keyeventsLock.Lock()
+	defer screen.keyeventsLock.Unlock()
+
+	if len(screen.keyevents) != 0 {
+		event := screen.keyevents[0]
+		copy(screen.keyevents, screen.keyevents[1:])
+		screen.keyevents = screen.keyevents[:len(screen.keyevents)-1]
+		return event
+	}
+	return NoKeyEvent
+}
+
+type simulatedSensors struct {
+	configured  drivers.Measurement
+	lock        sync.Mutex
+	accelSource [3]float64
+	stepsSource uint32
+	accel       [3]int32
+	steps       uint32
+	temp        int32
+}
+
+// Configure configures all sensors as specified in the which parameter.
+// If there is an error, none of the sensors can be relied upon to work.
+func (s *simulatedSensors) Configure(which drivers.Measurement) error {
+	s.configured = which
+	return nil
+}
+
+// Update updates the sensor values as given in the which parameter.
+// All sensors in the which parameter must have been configured before, or the
+// behavior may be unpredictable.
+func (s *simulatedSensors) Update(which drivers.Measurement) error {
+	if which != s.configured&which {
+		// This is a bug. Don't check it on each board, but do check it in the
+		// simulator.
+		panic("asked to update sensors that weren't configured")
+	}
+
+	if which&drivers.Acceleration != 0 {
+		s.lock.Lock()
+		// Add some noise to the accelerometer to make the values more
+		// realistic.
+		s.accel[0] = rand.Int31n(30_000) - 15_000 + int32(s.accelSource[0]*1000_000) // x
+		s.accel[1] = rand.Int31n(30_000) - 15_000 + int32(s.accelSource[1]*1000_000) // y
+		s.accel[2] = rand.Int31n(30_000) - 15_000 + int32(s.accelSource[2]*1000_000) // z
+		s.steps = s.stepsSource
+		s.lock.Unlock()
+	}
+	if which&drivers.Temperature != 0 {
+		// Temperature around 20°C (with some jitter thrown in for a good
+		// simulation).
+		s.temp = 20000 + rand.Int31n(200) - 100
+	}
+	return nil
+}
+
+// Acceleration returns the last read acceleration in µg (micro-gravity). This
+// includes gravity: when one of the axes is pointing straight to Earth and the
+// sensor is not moving the returned value will be around 1000000 or -1000000.
+//
+// The accelerometer values match those used on Android. When the device is
+// lying flat on a table, the Z axis is around 1g. When the device is rotated
+// 90° upright, the Y axis is around 1g. When the device is then rotated 90° to
+// the left (counter-clockwise), the X axis is around 1g.
+//
+// The simulator returns values as if the device is held upright like you'd hold
+// a phone while taking a selfie.
+func (s *simulatedSensors) Acceleration() (x, y, z int32) {
+	return s.accel[0], s.accel[1], s.accel[2]
+}
+
+// Steps returns the number of steps since the step counter started.
+// The uint32 value is assumed to be large enough for all practical use cases.
+//
+// The value can be incremented from the simulator.
+func (s *simulatedSensors) Steps() (steps uint32) {
+	return s.steps
+}
+
+// Temperature returns the temperature that was last read from the sensor.
+// If there are multiple temperature sensors on a given board, the most accurate
+// result will be returned.
+//
+// The simulator returns a fixed temperature, with some jitter to make it look
+// more like a real-world sensor (no sensor is without noise).
+func (s *simulatedSensors) Temperature() int32 {
+	return s.temp
+}
+
+type simulatedLEDs struct {
+	data []byte
+}
+
+// Initialize the addressable LEDs.
+//
+// The way to determine whether there are addressable LEDs on a given board, is
+// to configure them and then check the length of board.AddressableLEDs.Data.
+func (l *simulatedLEDs) Configure() {
+	startWindow()
+	l.data = make([]byte, Simulator.AddressableLEDs*3)
+	l.Update()
+}
+
+func (l *simulatedLEDs) Len() int {
+	return len(l.data) / 3
+}
+
+func (l *simulatedLEDs) SetRGB(i int, r, g, b uint8) {
+	l.data[i*3+0] = r
+	l.data[i*3+1] = g
+	l.data[i*3+2] = b
+}
+
+// Update the LEDs with the color data.
+func (l *simulatedLEDs) Update() {
+	cmd := fmt.Sprintf("addressable-leds %d", l.Len())
+	windowSendCommand(cmd, l.data)
+}
+
+var (
+	fyneStart    sync.Once
+	windowLock   sync.Mutex
+	windowStdin  io.WriteCloser
+	windowStdout io.ReadCloser
+)
+
+// Ensure the window is running in a separate process, starting it if necessary.
+func startWindow() {
+	// Create a main loop for Fyne.
+	windowRunning := make(chan struct{})
+	fyneStart.Do(func() {
+		// Start the separate process that manages the window.
+		go func() {
+			cmd := exec.Command(os.Args[0], runWindowCommand)
+			cmd.Stderr = os.Stderr
+			windowStdin, _ = cmd.StdinPipe()
+			windowStdout, _ = cmd.StdoutPipe()
+			err := cmd.Start()
+			if err != nil {
+				fmt.Fprintln(os.Stdout, "could not start window process:", err)
+				os.Exit(1)
+			}
+			close(windowRunning)
+			err = cmd.Wait()
+			if err != nil {
+				if exitErr, ok := err.(*exec.ExitError); ok {
+					os.Exit(exitErr.ExitCode())
+				}
+				os.Exit(1)
+			}
+			// The window was closed, so exit.
+			os.Exit(0)
+		}()
+		<-windowRunning
+
+		// Listen for events (keyboard/touch).
+		go windowListenEvents()
+
+		// Do some initialization.
+		windowSendCommand("title "+Simulator.WindowTitle, nil)
+	})
+}
+
+// Send a command to the separate process that manages the window.
+// The command is a single line (without newline). The data part is optional
+// binary data that can be sent with the command. The size of this binary data
+// must be part of the textual command.
+func windowSendCommand(command string, data []byte) {
+	windowLock.Lock()
+	defer windowLock.Unlock()
+
+	windowStdin.Write([]byte(command + "\n"))
+	windowStdin.Write(data)
+}
+
+// Goroutine that listens for window events like button and touch (keyboard and
+// mouse).
+func windowListenEvents() {
+	r := bufio.NewReader(windowStdout)
+	for {
+		line, err := r.ReadString('\n')
+		if err != nil {
+			if err == io.EOF {
+				break
+			}
+			fmt.Fprintln(os.Stderr, "failed to read I/O events from child process:", err)
+		}
+		cmd := strings.Fields(line)[0]
+		switch cmd {
+		case "keypress", "keyrelease":
+			// Read the key code.
+			var key KeyEvent
+			fmt.Sscanf(line, "%s %d", &cmd, &key)
+			if cmd == "keyrelease" {
+				key |= keyReleased
+			}
+
+			// Add the key code to the
+			screen.keyeventsLock.Lock()
+			screen.keyevents = append(screen.keyevents, key)
+			screen.keyeventsLock.Unlock()
+		case "mousedown":
+			// Read the event.
+			var x, y int16
+			fmt.Sscanf(line, "%s %d %d", &cmd, &x, &y)
+
+			// Update the touch state.
+			screen.touchesLock.Lock()
+			screen.touchID++
+			screen.touches[0] = TouchPoint{
+				ID: screen.touchID,
+				X:  x,
+				Y:  y,
+			}
+			screen.touchesLock.Unlock()
+		case "mouseup":
+			// End the current touch.
+			screen.touchesLock.Lock()
+			screen.touches[0] = TouchPoint{} // no active touch
+			screen.touchesLock.Unlock()
+		case "mousemove":
+			// Read the event.
+			var x, y int16
+			fmt.Sscanf(line, "%s %d %d", &cmd, &x, &y)
+
+			// Update the touch state.
+			screen.touchesLock.Lock()
+			if screen.touches[0].ID != 0 {
+				screen.touches[0].X = x
+				screen.touches[0].Y = y
+			}
+			screen.touchesLock.Unlock()
+		case "accel":
+			var x, y, z float64
+			fmt.Sscanf(line, "%s %f %f %f", &cmd, &x, &y, &z)
+			Sensors.lock.Lock()
+			Sensors.accelSource[0] = x
+			Sensors.accelSource[1] = y
+			Sensors.accelSource[2] = z
+			Sensors.lock.Unlock()
+		case "steps":
+			var n uint32
+			fmt.Sscanf(line, "%s %d %d", &cmd, &n)
+			Sensors.lock.Lock()
+			Sensors.stepsSource = n
+			Sensors.lock.Unlock()
+		default:
+			fmt.Fprintln(os.Stderr, "unknown command:", cmd)
+		}
+	}
+}

board-thumby.go

@@ -0,0 +1,128 @@
+//go:build thumby
+
+package board
+
+import (
+	"machine"
+	"math/bits"
+	"time"
+
+	"tinygo.org/x/drivers/pixel"
+	"tinygo.org/x/drivers/ssd1306"
+)
+
+const (
+	Name = "pybadge"
+)
+
+var (
+	Power   = dummyBattery{state: UnknownBattery}
+	Sensors = baseSensors{}
+	Display = mainDisplay{}
+	Buttons = &gpioButtons{}
+)
+
+type mainDisplay struct{}
+
+func (d mainDisplay) PPI() int {
+	return 192 // 72px wide display / 3/8 of an inch wide display
+}
+
+func (d mainDisplay) Configure() Displayer[pixel.Monochrome] {
+	machine.SPI0.Configure(machine.SPIConfig{})
+	display := ssd1306.NewSPI(machine.SPI0, machine.THUMBY_DC_PIN, machine.THUMBY_RESET_PIN, machine.THUMBY_CS_PIN)
+	display.Configure(ssd1306.Config{
+		Width:     72,
+		Height:    40,
+		ResetCol:  ssd1306.ResetValue{28, 99},
+		ResetPage: ssd1306.ResetValue{0, 5},
+	})
+
+	return &display
+}
+
+func (d mainDisplay) MaxBrightness() int {
+	return 1
+}
+
+func (d mainDisplay) SetBrightness(level int) {
+	// Nothing to do here.
+}
+
+func (d mainDisplay) WaitForVBlank(defaultInterval time.Duration) {
+	dummyWaitForVBlank(defaultInterval)
+}
+
+func (d mainDisplay) ConfigureTouch() TouchInput {
+	return noTouch{}
+}
+
+type gpioButtons struct {
+	state         uint8
+	previousState uint8
+}
+
+func (b *gpioButtons) Configure() {
+	machine.THUMBY_BTN_A_PIN.Configure(machine.PinConfig{Mode: machine.PinInput})
+	machine.THUMBY_BTN_B_PIN.Configure(machine.PinConfig{Mode: machine.PinInput})
+	machine.THUMBY_BTN_UDPAD_PIN.Configure(machine.PinConfig{Mode: machine.PinInput})
+	machine.THUMBY_BTN_LDPAD_PIN.Configure(machine.PinConfig{Mode: machine.PinInput})
+	machine.THUMBY_BTN_DDPAD_PIN.Configure(machine.PinConfig{Mode: machine.PinInput})
+	machine.THUMBY_BTN_RDPAD_PIN.Configure(machine.PinConfig{Mode: machine.PinInput})
+}
+
+func (b *gpioButtons) ReadInput() {
+	state := uint8(0)
+	if !machine.THUMBY_BTN_A_PIN.Get() {
+		state |= 1
+	}
+	if !machine.THUMBY_BTN_B_PIN.Get() {
+		state |= 2
+	}
+	if !machine.THUMBY_BTN_UDPAD_PIN.Get() {
+		state |= 4
+	}
+	if !machine.THUMBY_BTN_LDPAD_PIN.Get() {
+		state |= 8
+	}
+	if !machine.THUMBY_BTN_DDPAD_PIN.Get() {
+		state |= 16
+	}
+	if !machine.THUMBY_BTN_RDPAD_PIN.Get() {
+		state |= 32
+	}
+	b.state = state
+}
+
+var codes = [8]Key{
+	KeyA,
+	KeyB,
+	KeyUp,
+	KeyLeft,
+	KeyDown,
+	KeyRight,
+}
+
+func (b *gpioButtons) NextEvent() KeyEvent {
+	// The xor between the previous state and the current state is the buttons
+	// that changed.
+	change := b.state ^ b.previousState
+	if change == 0 {
+		return NoKeyEvent
+	}
+
+	// Find the index of the button with the lowest index that changed state.
+	index := bits.TrailingZeros32(uint32(change))
+	e := KeyEvent(codes[index])
+	if b.state&(1<<index) == 0 {
+		// The button state change was from 1 to 0, so it was released.
+		e |= keyReleased
+	}
+
+	// This button event was read, so mark it as such.
+	// By toggling the bit, the bit will be set to the value that is currently
+	// in b.state.
+	b.previousState ^= (1 << index)
+
+	return e
+}

common.go

@@ -0,0 +1,327 @@
+package board
+
+import (
+	"time"
+	"unsafe"
+
+	"tinygo.org/x/drivers"
+	"tinygo.org/x/drivers/pixel"
+)
+
+var (
+	AddressableLEDs LEDArray = dummyAddressableLEDs{}
+)
+
+// Settings for the simulator. These can be modified at any time, but it is
+// recommended to modify them before configuring any of the board peripherals.
+//
+// These can be modified to match whatever board your main target is. For
+// example, if your board has a display that's only 160 by 128 pixels, you can
+// modify the window size here to get a realistic simulation.
+var Simulator = struct {
+	WindowTitle string
+
+	// Width and height in virtual pixels (matching Size()). The window will
+	// take up more physical pixels on high-DPI screens.
+	WindowWidth  int
+	WindowHeight int
+
+	// Pixels per inch. The default is 120, which matches many commonly used
+	// high-DPI screens (for example, Apple screens).
+	WindowPPI int
+
+	// How much time it takes (in nanoseconds) to draw a single pixel.
+	// For example, for 8MHz and 16 bits per color:
+	//     time.Second * 16 / 8e6
+	WindowDrawSpeed time.Duration
+
+	// Number of addressable LEDs used by default.
+	AddressableLEDs int
+}{
+	WindowTitle:  "Simulator",
+	WindowWidth:  240,
+	WindowHeight: 240,
+	WindowPPI:    120, // common on many modern displays (for example Retina is 254 / 2 = 127)
+
+	// This matches common event badges like the PyBadge and the MCH2022 badge
+	// (but not the SHA2017 badge which uses 6 RGBW LEDs).
+	AddressableLEDs: 5,
+}
+
+// ChargeState is the charging status of a battery.
+type ChargeState uint8
+
+const (
+	// A battery might be attached, this is unknown (no way to know by reading a
+	// pin).
+	UnknownBattery ChargeState = iota
+
+	// This board doesn't have batteries.
+	NoBattery
+
+	// No battery is attached to the board, but there could be one.
+	BatteryUnavailable
+
+	// There is a battery attached and it's charging (usually from USB)
+	Charging
+
+	// Power is present, but the battery is not charging (usually when it is
+	// fully charged).
+	NotCharging
+
+	// There is a battery attached and it's not charging (no power connected).
+	Discharging
+)
+
+// Return a string representation of the charge status, mainly for debugging.
+func (c ChargeState) String() string {
+	switch c {
+	default:
+		return "unknown"
+	case NoBattery:
+		return "none"
+	case BatteryUnavailable:
+		return "not connected"
+	case Charging:
+		return "charging"
+	case NotCharging:
+		return "not charging"
+	case Discharging:
+		return "discharging"
+	}
+}
+
+// A LED array is a sequence of individually addressable LEDs (like WS2812).
+type LEDArray interface {
+	// Configure the LED array. This needs to be called before any other method
+	// (except Len).
+	Configure()
+
+	// Return the length of the LED array.
+	Len() int
+
+	// Set a given pixel to the RGB value. The index must be in bounds,
+	// otherwise this method will panic. The value is not immediately visible,
+	// call Update() to update the pixel array.
+	// Note that LED arrays are usually indexed from the end, because of the way
+	// data is sent to them.
+	SetRGB(index int, r, g, b uint8)
+
+	// Update the pixel array to the values previously set in SetRGB.
+	Update()
+}
+
+// The display interface shared by all supported displays.
+type Displayer[T pixel.Color] interface {
+	// The display size in pixels.
+	Size() (width, height int16)
+
+	// DrawBitmap copies the bitmap to the internal buffer on the screen at the
+	// given coordinates. It returns once the image data has been sent
+	// completely.
+	DrawBitmap(x, y int16, buf pixel.Image[T]) error
+
+	// Display the written image on screen. This call may or may not be
+	// necessary depending on the screen, but it's better to call it anyway.
+	Display() error
+
+	// Enter or exit sleep mode.
+	Sleep(sleepEnabled bool) error
+
+	// Return the current screen rotation.
+	// Note that some screens are by default configured with rotation, so by
+	// default you may not get drivers.Rotation0.
+	Rotation() drivers.Rotation
+
+	// Set a given rotation. For example, to rotate by 180° you can use:
+	//
+	// 	SetRotation((Rotation() + 2) % 4)
+	//
+	// Not all displays support rotation, in which case they will return an
+	// error.
+	SetRotation(drivers.Rotation) error
+}
+
+// TouchInput reads the touch screen (resistive/capacitive) on a display and
+// returns the current list of touch points.
+type TouchInput interface {
+	ReadTouch() []TouchPoint
+}
+
+// A single touch point on the screen, from a finger, stylus, or something like
+// that.
+type TouchPoint struct {
+	// ID for this touch point. New touch events get a monotonically
+	// incrementing ID. Because it is a uint32 (and it's unlikely a screen will
+	// be touched more than 4 billion times), it can be treated as a unique ID.
+	ID uint32
+
+	// X and Y pixel coordinates.
+	X, Y int16
+}
+
+// Key is a single keyboard key (not to be confused with a single character).
+type Key uint8
+
+// List of all supported key codes.
+const (
+	NoKey = iota
+
+	// Special keys.
+	KeyEscape
+
+	// Navigation keys.
+	KeyLeft
+	KeyRight
+	KeyUp
+	KeyDown
+
+	// Character keys.
+	KeyEnter
+	KeySpace
+	KeyA
+	KeyB
+	KeyL
+	KeyR
+
+	// Special keys, used on some boards.
+	KeySelect
+	KeyStart
+)
+
+// KeyEvent is a single key press or release event.
+type KeyEvent uint16
+
+const (
+	NoKeyEvent KeyEvent = iota // No key event was available.
+
+	keyReleased = KeyEvent(1 << 15) // The upper bit is set when this is a release event
+)
+
+// Key returns the key code for this key event.
+func (k KeyEvent) Key() Key {
+	return Key(k) // lower 8 bits are the key code
+}
+
+// Pressed returns whether this event indicates a key press event. It returns
+// true for a press, false for a release.
+func (k KeyEvent) Pressed() bool {
+	return k&keyReleased == 0
+}
+
+// Default lithium battery charge curve.
+// This data is taken from the InfiniTime project:
+// https://github.com/InfiniTimeOrg/InfiniTime/pull/1444
+// It is unlikely to be very accurate for other batteries, but it's a reasonable
+// approximation if no specific discharge curve has been made.
+var lithumBatteryApproximation = batteryApproximation{
+	voltages: [6]uint16{3500, 3600, 3700, 3750, 3900, 4180},
+	percents: [6]int8{0, 10, 25, 50, 75, 100},
+}
+
+type batteryApproximation struct {
+	voltages [6]uint16
+	percents [6]int8
+}
+
+func (approx *batteryApproximation) approximate(microvolts uint32) int8 {
+	if microvolts <= uint32(approx.voltages[0])*1000 {
+		return 0 // below the lowest value
+	}
+	for i, v := range approx.voltages {
+		if uint32(v)*1000 > microvolts {
+			voltStart := uint32(approx.voltages[i-1]) * 1000
+			voltEnd := uint32(v) * 1000
+			percentStart := approx.percents[i-1]
+			percentEnd := approx.percents[i]
+			voltOffset := microvolts - voltStart
+			voltDiff := voltEnd - voltStart
+			percentDiff := percentEnd - percentStart
+			percentOffset := voltOffset * uint32(percentDiff) / uint32(voltDiff)
+			return int8(percentOffset + uint32(percentStart))
+		}
+	}
+	// Outside the table, so must be 100%.
+	return 100
+}
+
+func (approx *batteryApproximation) approximatePPM(microvolts uint32) int32 {
+	if microvolts <= uint32(approx.voltages[0])*1000 {
+		return 0 // below the lowest value
+	}
+	for i, v := range approx.voltages {
+		if uint32(v)*1000 > microvolts {
+			voltStart := uint32(approx.voltages[i-1]) // mV
+			voltEnd := uint32(v)                      // mV
+			percentStart := approx.percents[i-1]
+			percentEnd := approx.percents[i]
+			voltOffset := microvolts - voltStart*1000 // µV
+			voltDiff := voltEnd - voltStart           // mV
+			percentDiff := percentEnd - percentStart
+			percentOffset := voltOffset * uint32(percentDiff) * 10 / voltDiff
+			return int32(percentStart)*10000 + int32(percentOffset)
+		}
+	}
+	// Outside the table, so must be 100%.
+	return 1000_000
+}
+
+type dummyAddressableLEDs struct {
+}
+
+func (l dummyAddressableLEDs) Configure() {
+	// Nothing to do here.
+}
+
+func (l dummyAddressableLEDs) Len() int {
+	return 0 // always zero
+}
+
+func (l dummyAddressableLEDs) SetRGB(i int, r, g, b uint8) {
+	panic("no LEDs on this board")
+}
+
+func (l dummyAddressableLEDs) Update() {
+	// Nothing to do here.
+}
+
+type colorFormat interface {
+	colorGRB
+}
+
+type colorGRB struct{ G, R, B uint8 }
+
+// Convert pixel data to a byte slice, for sending it to WS2812 LEDs for
+// example.
+func pixelsToBytes[T colorFormat](pix []T) []byte {
+	if len(pix) == 0 {
+		return nil
+	}
+	var zeroColor T
+	ptr := unsafe.Pointer(unsafe.SliceData(pix))
+	return unsafe.Slice((*byte)(ptr), len(pix)*int(unsafe.Sizeof(zeroColor)))
+}
+
+// Dummy sensor value, to be embedded in actual drivers.Sensor implementations.
+type baseSensors struct {
+}
+
+func (s baseSensors) Configure(which drivers.Measurement) error {
+	return nil
+}
+
+func (s baseSensors) Update(which drivers.Measurement) error {
+	return nil
+}
+
+func (s baseSensors) Acceleration() (x, y, z int32) {
+	return 0, 0, 0
+}
+
+func (s baseSensors) Steps() uint32 {
+	return 0
+}
+
+func (s baseSensors) Temperature() int32 {
+	return 0
+}

common_test.go

@@ -0,0 +1,29 @@
+package board
+
+import "testing"
+
+func TestBatteryApprox(t *testing.T) {
+	for _, tc := range []struct {
+		microvolts uint32
+		percent    int8
+	}{
+		{2900_000, 0},
+		{3400_000, 0},
+		{3500_000, 0},
+		{3510_000, 1},
+		{3528_000, 2},  // the value is rounded down (this is more like 2.8%)
+		{3730_000, 40}, // guess, probably higher
+		{3749_999, 49}, // rounded down
+		{3750_000, 50},
+		{3750_001, 50},
+		{4179_999, 99},  // rounded down
+		{4180_000, 100}, // exactly at 100%
+		{4180_001, 100}, // higher values get rounded down
+		{5000_000, 100}, // unlikely high voltage, still 100%
+	} {
+		percent := lithumBatteryApproximation.approximate(tc.microvolts)
+		if percent != tc.percent {
+			t.Errorf("for %.3fV, expected %d%% but got %d%%", float64(tc.microvolts)/1e6, tc.percent, percent)
+		}
+	}
+}

dummy.go

@@ -0,0 +1,57 @@
+package board
+
+import "time"
+
+// This file contains dummy devices, for devices which don't support a
+// particular kind of device.
+
+// Dummy button input that doesn't actually read any inputs.
+// Used for boards that don't have any buttons.
+type noButtons struct{}
+
+func (b noButtons) Configure() {
+}
+
+func (b noButtons) ReadInput() {
+}
+
+func (b noButtons) NextEvent() KeyEvent {
+	return NoKeyEvent
+}
+
+// Dummy touch object that doesn't read any input.
+// Used for displays without touch capabilities.
+type noTouch struct{}
+
+func (t noTouch) ReadTouch() []TouchPoint {
+	return nil
+}
+
+var lastWaitForVBlank time.Time
+
+// Utility function for all those boards that don't support vblank.
+func dummyWaitForVBlank(defaultInterval time.Duration) {
+	waitUntil := lastWaitForVBlank.Add(defaultInterval)
+	now := time.Now()
+	duration := waitUntil.Sub(now)
+	if duration < 0 {
+		lastWaitForVBlank = now
+		return
+	}
+	time.Sleep(duration)
+	lastWaitForVBlank = waitUntil
+}
+
+// Dummy implementation of the Power value, for devices with no battery or where
+// the battery status cannot be read.
+type dummyBattery struct {
+	state ChargeState
+}
+
+func (b dummyBattery) Configure() {
+	// nothing to do here
+}
+
+func (b dummyBattery) Status() (ChargeState, uint32, int8) {
+	return b.state, 0, -1
+}

go.mod

@@ -0,0 +1,39 @@
+module gitrepo.ru/neonxp/board
+
+go 1.20
+
+require (
+	fyne.io/fyne/v2 v2.3.4
+	golang.org/x/image v0.3.0
+	tinygo.org/x/drivers v0.27.1-0.20240525063452-831982ad33ee
+)
+
+require (
+	fyne.io/systray v1.10.1-0.20230403195833-7dc3c09283d6 // indirect
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/fredbi/uri v0.1.0 // indirect
+	github.com/fsnotify/fsnotify v1.5.4 // indirect
+	github.com/fyne-io/gl-js v0.0.0-20220119005834-d2da28d9ccfe // indirect
+	github.com/fyne-io/glfw-js v0.0.0-20220120001248-ee7290d23504 // indirect
+	github.com/fyne-io/image v0.0.0-20220602074514-4956b0afb3d2 // indirect
+	github.com/go-gl/gl v0.0.0-20211210172815-726fda9656d6 // indirect
+	github.com/go-gl/glfw/v3.3/glfw v0.0.0-20221017161538-93cebf72946b // indirect
+	github.com/go-text/typesetting v0.0.0-20230405155246-bf9c697c6e16 // indirect
+	github.com/godbus/dbus/v5 v5.1.0 // indirect
+	github.com/goki/freetype v0.0.0-20220119013949-7a161fd3728c // indirect
+	github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510 // indirect
+	github.com/gopherjs/gopherjs v1.17.2 // indirect
+	github.com/jsummers/gobmp v0.0.0-20151104160322-e2ba15ffa76e // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/srwiley/oksvg v0.0.0-20220731023508-a61f04f16b76 // indirect
+	github.com/srwiley/rasterx v0.0.0-20210519020934-456a8d69b780 // indirect
+	github.com/stretchr/testify v1.8.0 // indirect
+	github.com/tevino/abool v1.2.0 // indirect
+	github.com/yuin/goldmark v1.4.13 // indirect
+	golang.org/x/mobile v0.0.0-20211207041440-4e6c2922fdee // indirect
+	golang.org/x/net v0.7.0 // indirect
+	golang.org/x/sys v0.5.0 // indirect
+	golang.org/x/text v0.7.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+	honnef.co/go/js/dom v0.0.0-20210725211120-f030747120f2 // indirect
+)

go.sum

@@ -0,0 +1,678 @@
+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
+cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
+cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
+cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
+cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
+cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To=
+cloud.google.com/go v0.52.0/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4=
+cloud.google.com/go v0.53.0/go.mod h1:fp/UouUEsRkN6ryDKNW/Upv/JBKnv6WDthjR6+vze6M=
+cloud.google.com/go v0.54.0/go.mod h1:1rq2OEkV3YMf6n/9ZvGWI3GWw0VoqH/1x2nd8Is/bPc=
+cloud.google.com/go v0.56.0/go.mod h1:jr7tqZxxKOVYizybht9+26Z/gUq7tiRzu+ACVAMbKVk=
+cloud.google.com/go v0.57.0/go.mod h1:oXiQ6Rzq3RAkkY7N6t3TcE6jE+CIBBbA36lwQ1JyzZs=
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simulator.go

@@ -0,0 +1,397 @@
+//go:build !baremetal
+
+package board
+
+// The simulator for a generic board. It can simulate various kinds of hardware,
+// like:
+//   * event badges
+//   * GameBoy-like handhelds (Game Boy Advance, PyBadge)
+//   * smartwatches
+//   * boards with only a touchscreen (PyPortal).
+// It is currently mostly made for boards with a display, but this is not at all
+// a requirement in the API.
+//
+// The board API doesn't use a mainloop of any kind, which would not be
+// necessary anyway on embedded systems. But it is necessary on OSes, so to work
+// around this the simulator is actually run in a separate process by starting
+// the current process again and communicating over pipes (stdin/stdout in the
+// simulator process).
+
+import (
+	"bufio"
+	"fmt"
+	"image"
+	"image/color"
+	"io"
+	"math/rand"
+	"os"
+	"strconv"
+	"strings"
+	"sync"
+
+	"fyne.io/fyne/v2"
+	"fyne.io/fyne/v2/app"
+	"fyne.io/fyne/v2/canvas"
+	"fyne.io/fyne/v2/container"
+	"fyne.io/fyne/v2/driver/desktop"
+	"fyne.io/fyne/v2/layout"
+	"fyne.io/fyne/v2/widget"
+	"golang.org/x/image/draw"
+)
+
+const runWindowCommand = "run-simulator-window"
+
+func init() {
+	if len(os.Args) >= 2 && os.Args[1] == runWindowCommand {
+		// This is the simulator process.
+		// Run the entire window in an init function, because that's the only
+		// way to do this with the API that is exposed by the board package.
+		windowMain()
+		os.Exit(0)
+	}
+}
+
+var (
+	displayImageLock         sync.Mutex
+	displayImage             *image.RGBA
+	displayScrollTopFixed    int
+	displayScrollBottomFixed int
+	displayScrollLine        int
+	displayMaxBrightness     = 1
+	displayBrightness        = 0
+
+	ledsLock   sync.Mutex
+	leds       []color.RGBA
+	ledsPerRow = 6
+)
+
+// The main function for the window process.
+func windowMain() {
+	// Create a raster image to use as a display buffer.
+	displayImage = image.NewRGBA(image.Rect(0, 0, 240, 240))
+	display := &displayWidget{}
+	display.Generator = func(w, h int) image.Image {
+		displayImageLock.Lock()
+		defer displayImageLock.Unlock()
+		img := image.NewRGBA(image.Rect(0, 0, w, h))
+		draw.Draw(img, image.Rect(0, 0, w, h), image.NewUniform(color.RGBA{
+			R: 192,
+			G: 192,
+			B: 192,
+			A: 255,
+		}), image.Pt(0, 0), draw.Over)
+		rect := displayImage.Bounds()
+		scale := h / rect.Dy()
+		width := rect.Dx() * scale
+		height := rect.Dy() * scale
+		x := (w - width) / 2
+		y := (h - height) / 2
+		displayRect := image.Rect(x, y, x+width, y+height)
+		if displayBrightness <= 0 {
+			// The backlight is off, so indicate this by making the screen gray.
+			draw.Draw(img, displayRect, image.NewUniform(color.RGBA{
+				R: 96,
+				G: 96,
+				B: 96,
+				A: 255,
+			}), image.Pt(0, 0), draw.Src)
+		} else {
+			// Draw the display as usual.
+			scrolledImage := displayImage
+			if displayScrollLine != 0 {
+				// Hardware scrolling is in use, so scroll the middle part of
+				// the screen.
+				scrolledImage = image.NewRGBA(displayImage.Rect)
+				topH := displayScrollTopFixed
+				bottomH := displayScrollBottomFixed
+				childH := rect.Dy() - topH - bottomH
+				rotated := displayScrollLine - topH
+				rotatedUpH := childH - rotated
+				rotatedDownH := childH - rotatedUpH
+				draw.Copy(scrolledImage, image.Pt(0, 0), displayImage, image.Rect(0, 0, rect.Dx(), topH), draw.Over, nil)                                    // top fixed area
+				draw.Copy(scrolledImage, image.Pt(0, topH), displayImage, image.Rect(0, topH+rotatedDownH, rect.Dx(), topH+childH), draw.Over, nil)          // rotated up part
+				draw.Copy(scrolledImage, image.Pt(0, topH+rotatedUpH), displayImage, image.Rect(0, topH, rect.Dx(), topH+rotatedDownH), draw.Over, nil)      // rotated down part
+				draw.Copy(scrolledImage, image.Pt(0, rect.Dy()-bottomH), displayImage, image.Rect(0, rect.Dy()-bottomH, rect.Dx(), bottomH), draw.Over, nil) // bottom fixed area
+			}
+			draw.NearestNeighbor.Scale(img, displayRect, scrolledImage, scrolledImage.Bounds(), draw.Src, nil)
+		}
+		return img
+	}
+
+	// Create LEDs.
+	ledsWidget := canvas.NewRaster(func(w, h int) image.Image {
+		ledsLock.Lock()
+		defer ledsLock.Unlock()
+		img := image.NewRGBA(image.Rect(0, 0, w, h))
+
+		// Draw all the LEDs as squares, each 24 pixels in size with an 8 pixel
+		// gap.
+		rows := (len(leds) + ledsPerRow - 1) / ledsPerRow
+		scale := float64(h) / float64(rows*32)
+		col := 0
+		row := 0
+		for _, c := range leds {
+			x0 := int(float64(8+col*32) * scale)
+			x1 := int(float64(8+col*32+24) * scale)
+			y0 := int(float64(row*32) * scale)
+			y1 := int(float64(row*32+24) * scale)
+			area := image.Rect(x0, y0, x1, y1)
+			draw.Draw(img, area, image.NewUniform(c), image.Pt(0, 0), draw.Src)
+			col++
+			if col >= ledsPerRow {
+				col = 0
+				row++
+			}
+		}
+		return img
+	})
+	ledsWidget.Hidden = true
+
+	// X/Y/Z acceleration.
+	// Simulate the device in an upright position (like how you'd hold a phone
+	// when making a photo in portrait mode).
+	var accelX, accelY, accelZ = 0.0, 1.0, 0.0
+	accelContainer := container.New(layout.NewHBoxLayout(),
+		widget.NewLabel(strconv.FormatFloat(accelX, 'f', 2, 64)),
+		widget.NewLabel(strconv.FormatFloat(accelY, 'f', 2, 64)),
+		widget.NewLabel(strconv.FormatFloat(accelZ, 'f', 2, 64)))
+	fmt.Printf("accel %f %f %f\n", accelX, accelY, accelZ)
+
+	// Step count.
+	var stepCount uint32
+	stepCountWidget := widget.NewLabel("0")
+	stepCountIncrementButton := widget.NewButton("+", func() {
+		stepCount++
+		stepCountWidget.SetText(strconv.FormatUint(uint64(stepCount), 10))
+		fmt.Printf("steps %d\n", stepCount)
+	})
+	stepCountContainer := container.New(layout.NewHBoxLayout(), stepCountWidget, layout.NewSpacer(), stepCountIncrementButton)
+
+	paramGrid := container.New(layout.NewGridLayout(2),
+		widget.NewLabel("Accel X/Y/Z:"), accelContainer,
+		widget.NewLabel("Steps:"), stepCountContainer)
+
+	// Create a window.
+	a := app.New()
+	w := a.NewWindow("Simulator")
+	w.SetPadded(false)
+	w.SetFixedSize(true)
+	w.SetContent(fyne.NewContainerWithLayout(layout.NewVBoxLayout(), display, ledsWidget, paramGrid))
+
+	// Listen for keyboard events, and translate them to board API keycodes.
+	if deskCanvas, ok := w.Canvas().(desktop.Canvas); ok {
+		deskCanvas.SetOnKeyDown(func(event *fyne.KeyEvent) {
+			key := decodeFyneKey(event.Name)
+			if key != NoKey {
+				fmt.Printf("keypress %d\n", key)
+			}
+		})
+		deskCanvas.SetOnKeyUp(func(event *fyne.KeyEvent) {
+			key := decodeFyneKey(event.Name)
+			if key != NoKey {
+				fmt.Printf("keyrelease %d\n", key)
+			}
+		})
+	}
+
+	// Listen for events from the parent process (which includes display data).
+	go windowReceiveEvents(w, display, ledsWidget)
+
+	// Show the window.
+	w.ShowAndRun()
+}
+
+// Goroutine that listens for commands from the parent process.
+func windowReceiveEvents(w fyne.Window, display *displayWidget, ledsWidget *canvas.Raster) {
+	r := bufio.NewReader(os.Stdin)
+	for {
+		line, err := r.ReadString('\n')
+		if err != nil {
+			if err != io.EOF {
+				fmt.Fprintln(os.Stderr, "unexpected error:", err)
+				os.Exit(1)
+			}
+			os.Exit(0)
+		}
+		cmd := strings.Fields(line)[0]
+		switch cmd {
+		case "display":
+			var width, height int
+			fmt.Sscanf(line, "%s %d %d\n", &cmd, &width, &height)
+			newImage := image.NewRGBA(image.Rect(0, 0, width, height))
+			for y := 0; y < height; y++ {
+				for x := 0; x < width; x++ {
+					r := rand.Uint32()
+					newImage.SetRGBA(x, y, color.RGBA{
+						R: uint8(r >> 0),
+						G: uint8(r >> 8),
+						B: uint8(r >> 16),
+						A: 255,
+					})
+				}
+			}
+
+			displayImageLock.Lock()
+			displayImage = newImage
+			display.SetMinSize(fyne.NewSize(float32(width), float32(height)))
+			displayImageLock.Unlock()
+		case "display-brightness":
+			displayImageLock.Lock()
+			fmt.Sscanf(line, "%s %d %d\n", &cmd, &displayBrightness, displayMaxBrightness)
+			displayImageLock.Unlock()
+			display.Refresh()
+		case "title":
+			w.SetTitle(strings.TrimSpace(line[len("title"):]))
+		case "draw":
+			// Read the image data (which is a single line).
+			var startX, startY, width int
+			fmt.Sscanf(line, "%s %d %d %d\n", &cmd, &startX, &startY, &width)
+			buf := make([]byte, width*3)
+			io.ReadFull(r, buf)
+
+			// Draw the image data to the image buffer.
+			displayImageLock.Lock()
+			for x := 0; x < width; x++ {
+				displayImage.SetRGBA(startX+x, startY, color.RGBA{
+					R: buf[x*3+0],
+					G: buf[x*3+1],
+					B: buf[x*3+2],
+					A: 255,
+				})
+			}
+			displayImageLock.Unlock()
+			display.Refresh()
+		case "scroll-start":
+			displayImageLock.Lock()
+			fmt.Sscanf(line, "%s %d %d\n", &cmd, &displayScrollTopFixed, &displayScrollBottomFixed)
+			displayImageLock.Unlock()
+			display.Refresh()
+		case "scroll":
+			displayImageLock.Lock()
+			fmt.Sscanf(line, "%s %d\n", &cmd, &displayScrollLine)
+			displayImageLock.Unlock()
+			display.Refresh()
+		case "scroll-stop":
+			displayImageLock.Lock()
+			displayScrollLine = 0
+			displayScrollTopFixed = 0
+			displayScrollBottomFixed = 0
+			displayImageLock.Unlock()
+			display.Refresh()
+		case "addressable-leds":
+			// Read the LED data.
+			var numLEDs int
+			fmt.Sscanf(line, "%s %d\n", &cmd, &numLEDs)
+			buf := make([]byte, numLEDs*3)
+			io.ReadFull(r, buf)
+
+			// Update the leds slice.
+			ledsLock.Lock()
+			if len(leds) != numLEDs {
+				// LEDs were configured for the first time (probably).
+				// Make sure we prepare for the given number of LEDs.
+				leds = make([]color.RGBA, numLEDs)
+				cols := ledsPerRow
+				if cols > len(leds) {
+					cols = len(leds)
+				}
+				rows := (len(leds) + ledsPerRow - 1) / ledsPerRow
+				ledsWidget.SetMinSize(fyne.NewSize(float32(cols*32+8), float32(rows*32)))
+				ledsWidget.Show()
+			}
+			for i := range leds {
+				leds[len(leds)-i-1] = color.RGBA{
+					R: gammaEncodeTable[buf[i*3+0]],
+					G: gammaEncodeTable[buf[i*3+1]],
+					B: gammaEncodeTable[buf[i*3+2]],
+					A: 255,
+				}
+			}
+			ledsLock.Unlock()
+			ledsWidget.Refresh()
+		default:
+			fmt.Fprintln(os.Stderr, "unknown command:", cmd)
+		}
+	}
+}
+
+func decodeFyneKey(key fyne.KeyName) KeyEvent {
+	var e KeyEvent
+	switch key {
+	case fyne.KeyLeft:
+		e = KeyLeft
+	case fyne.KeyRight:
+		e = KeyRight
+	case fyne.KeyUp:
+		e = KeyUp
+	case fyne.KeyDown:
+		e = KeyDown
+	case fyne.KeyEscape:
+		e = KeyEscape
+	case fyne.KeyReturn:
+		e = KeyEnter
+	case fyne.KeySpace:
+		e = KeySpace
+	case fyne.KeyA:
+		e = KeyA
+	case fyne.KeyB:
+		e = KeyB
+	default:
+		return NoKeyEvent
+	}
+	return e
+}
+
+var _ desktop.Mouseable = (*displayWidget)(nil)
+var _ fyne.Draggable = (*displayWidget)(nil)
+
+// Wrapper for canvas.Render that sends mouse events to the parent process.
+type displayWidget struct {
+	canvas.Raster
+}
+
+func (r *displayWidget) CreateRenderer() fyne.WidgetRenderer {
+	return widget.NewSimpleRenderer(&r.Raster)
+}
+
+func (r *displayWidget) MouseDown(event *desktop.MouseEvent) {
+	if event.Button == desktop.MouseButtonPrimary {
+		fmt.Printf("mousedown %d %d\n", int(event.Position.X), int(event.Position.Y))
+	}
+}
+
+func (r *displayWidget) MouseUp(event *desktop.MouseEvent) {
+	if event.Button == desktop.MouseButtonPrimary {
+		fmt.Printf("mouseup\n")
+	}
+}
+
+func (r *displayWidget) Dragged(event *fyne.DragEvent) {
+	fmt.Printf("mousemove %d %d\n", int(event.PointEvent.Position.X), int(event.PointEvent.Position.Y))
+}
+
+func (r *displayWidget) DragEnd() {
+	// handled in MouseUp
+}
+
+// Gamma brightness lookup table:
+// https://victornpb.github.io/gamma-table-generator
+// gamma = 0.45 steps = 256 range = 0-255
+var gammaEncodeTable = [256]uint8{
+	0, 21, 28, 34, 39, 43, 46, 50, 53, 56, 59, 61, 64, 66, 68, 70,
+	72, 74, 76, 78, 80, 82, 84, 85, 87, 89, 90, 92, 93, 95, 96, 98,
+	99, 101, 102, 103, 105, 106, 107, 109, 110, 111, 112, 114, 115, 116, 117, 118,
+	119, 120, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135,
+	136, 137, 138, 139, 140, 141, 142, 143, 144, 144, 145, 146, 147, 148, 149, 150,
+	151, 151, 152, 153, 154, 155, 156, 156, 157, 158, 159, 160, 160, 161, 162, 163,
+	164, 164, 165, 166, 167, 167, 168, 169, 170, 170, 171, 172, 173, 173, 174, 175,
+	175, 176, 177, 178, 178, 179, 180, 180, 181, 182, 182, 183, 184, 184, 185, 186,
+	186, 187, 188, 188, 189, 190, 190, 191, 192, 192, 193, 194, 194, 195, 195, 196,
+	197, 197, 198, 199, 199, 200, 200, 201, 202, 202, 203, 203, 204, 205, 205, 206,
+	206, 207, 207, 208, 209, 209, 210, 210, 211, 212, 212, 213, 213, 214, 214, 215,
+	215, 216, 217, 217, 218, 218, 219, 219, 220, 220, 221, 221, 222, 223, 223, 224,
+	224, 225, 225, 226, 226, 227, 227, 228, 228, 229, 229, 230, 230, 231, 231, 232,
+	232, 233, 233, 234, 234, 235, 235, 236, 236, 237, 237, 238, 238, 239, 239, 240,
+	240, 241, 241, 242, 242, 243, 243, 244, 244, 245, 245, 246, 246, 247, 247, 248,
+	248, 249, 249, 249, 250, 250, 251, 251, 252, 252, 253, 253, 254, 254, 255, 255,
+}

testdata/smoketest.go

@@ -0,0 +1,53 @@
+package main
+
+import (
+	"time"
+
+	"github.com/aykevl/board"
+	"tinygo.org/x/drivers"
+	"tinygo.org/x/drivers/pixel"
+)
+
+func main() {
+	// Verify board name constant.
+	var _ string = board.Name
+
+	// Assert that board.Display implements board.Displayer.
+	checkScreen(board.Display.Configure())
+
+	// Assert that Display uses the usual interface.
+	var _ interface {
+		//Configure() // already checked above
+		PPI() int
+		ConfigureTouch() board.TouchInput
+		MaxBrightness() int
+		SetBrightness(int)
+		WaitForVBlank(time.Duration)
+	} = board.Display
+
+	// Assert that board.Buttons uses the usual interface.
+	var _ interface {
+		Configure()
+		ReadInput()
+		NextEvent() board.KeyEvent
+	} = board.Buttons
+
+	// Assert that board.Power uses the usual interface.
+	var _ interface {
+		Configure()
+		Status() (state board.ChargeState, microvolts uint32, percent int8)
+	} = board.Power
+
+	// All sensors must implement the exact same interface, even if some methods
+	// are unsupported.
+	var _ interface {
+		Configure(which drivers.Measurement) error
+		Update(which drivers.Measurement) error
+		Acceleration() (x, y, z int32)
+		Steps() uint32
+		Temperature() int32
+	} = board.Sensors
+}
+
+func checkScreen[T pixel.Color](display board.Displayer[T]) {
+}

tinygo_test.go

@@ -0,0 +1,235 @@
+package board_test
+
+import (
+	"bytes"
+	"flag"
+	"go/ast"
+	"go/parser"
+	"go/token"
+	"os/exec"
+	"testing"
+)
+
+var boards = []string{
+	// Please keep this list sorted!
+	"badger2040",
+	"gameboy-advance",
+	"gopher-badge",
+	"mch2022",
+	"pinetime",
+	"pybadge",
+	"pyportal",
+	"simulator",
+	"thumby",
+}
+
+func isXtensa(board string) bool {
+	return board == "mch2022"
+}
+
+var flagXtensa = flag.Bool("xtensa", false, "test Xtensa based boards")
+
+// These method names should match the ones in testdata/smoketest.go, so that no
+// method goes unchecked!
+var definedGlobals = map[string][]string{
+	"Power": []string{
+		"Configure",
+		"Status",
+	},
+	"Sensors": []string{
+		"Configure",
+		"Update",
+		"Acceleration",
+		"Steps",
+		"Temperature",
+	},
+	"Display": []string{
+		"Configure",
+		"PPI",
+		"ConfigureTouch",
+		"MaxBrightness",
+		"SetBrightness",
+		"WaitForVBlank",
+	},
+	"Buttons": []string{
+		"Configure",
+		"ReadInput",
+		"NextEvent",
+	},
+}
+
+func TestBoards(t *testing.T) {
+	for _, board := range boards {
+		board := board
+		t.Run(board, func(t *testing.T) {
+			if isXtensa(board) && !*flagXtensa {
+				t.Skip("skipping Xtensa board:", board)
+			}
+			t.Parallel()
+			outbuf := &bytes.Buffer{}
+			var cmd *exec.Cmd
+			if board == "simulator" {
+				cmd = exec.Command("go", "build", "-o="+t.TempDir()+"/output", "./testdata/smoketest.go")
+			} else {
+				cmd = exec.Command("tinygo", "build", "-o="+t.TempDir()+"/output", "-target="+board, "./testdata/smoketest.go")
+			}
+			cmd.Stderr = outbuf
+			cmd.Stdout = outbuf
+			err := cmd.Run()
+			if err != nil {
+				t.Errorf("failed to compile smoke test: %s\n%s", err, outbuf.String())
+			}
+		})
+	}
+}
+
+// Test for exported names: all of them have to adhere to a strict API so that
+// the API for all boards is the same.
+func TestExported(t *testing.T) {
+	for _, board := range boards {
+		board := board
+		t.Run(board, func(t *testing.T) {
+			// Parse the Go file into an AST.
+			filename := "board-" + board + ".go"
+			fset := token.NewFileSet()
+			f, err := parser.ParseFile(fset, filename, nil, parser.SkipObjectResolution)
+			if err != nil {
+				t.Errorf("could not open/parse %s: %v", filename, err)
+			}
+
+			// Collect method names for (typically unexported) named types.
+			// Also set some defaults that aren't defined in board files (but in
+			// common.go, probably).
+			methodNames := map[string][]string{
+				"baseSensors":  definedGlobals["Sensors"],
+				"dummyBattery": definedGlobals["Power"],
+				"noButtons":    definedGlobals["Buttons"],
+			}
+			for _, decl := range f.Decls {
+				if decl, ok := decl.(*ast.FuncDecl); ok {
+					if decl.Name.IsExported() && decl.Recv != nil && len(decl.Recv.List) > 0 {
+						recvType := decl.Recv.List[0].Type
+						name := extractTypeName(recvType)
+						methodNames[name] = append(methodNames[name], decl.Name.Name)
+					}
+				}
+			}
+
+			// Check all exported types, variables, etc.
+			for _, decl := range f.Decls {
+				pos := fset.Position(decl.Pos())
+				switch decl := decl.(type) {
+				case *ast.FuncDecl:
+					if !decl.Name.IsExported() {
+						continue
+					}
+					if decl.Recv != nil && len(decl.Recv.List) > 0 {
+						// Method name, this is checked when checking named
+						// types.
+						continue
+					}
+					t.Errorf("%s: unexpected exported function %s", pos, decl.Name.Name)
+				case *ast.GenDecl:
+					switch decl.Tok {
+					case token.IMPORT:
+						// imports don't export anything
+					case token.CONST:
+						for _, spec := range decl.Specs {
+							pos := fset.Position(spec.Pos())
+							switch spec := spec.(type) {
+							case *ast.ValueSpec:
+								for _, name := range spec.Names {
+									if !name.IsExported() {
+										continue
+									}
+									if name.Name != "Name" {
+										// "Name" is the only allowed constant.
+										t.Errorf("%s: unexpected constant: %s", pos, name.Name)
+									}
+								}
+							default:
+								t.Errorf("%s: unexpected spec: %#v", pos, spec)
+							}
+						}
+					case token.VAR:
+						// Variables are things like Power, Display, etc that
+						// are typically defined using unexported named types.
+						// We need to check that they don't define any unexpected methods.
+						for _, spec := range decl.Specs {
+							pos := fset.Position(spec.Pos())
+							switch spec := spec.(type) {
+							case *ast.ValueSpec:
+								for _, name := range spec.Names {
+									if !name.IsExported() {
+										continue
+									}
+									if _, ok := definedGlobals[name.Name]; !ok {
+										t.Errorf("%s: unexpected variable: %s", pos, name.Name)
+										continue
+									}
+									if len(spec.Values) != 1 {
+										t.Errorf("%s: expected a single value for board.%s", pos, name.Name)
+										continue
+									}
+									typeName := extractTypeName(spec.Values[0])
+									if _, ok := methodNames[typeName]; !ok {
+										t.Errorf("%s: could not find methods for type %#v", pos, typeName)
+										continue
+									}
+									for _, typeMethod := range methodNames[typeName] {
+										found := false
+										for _, expectedMethod := range definedGlobals[name.Name] {
+											if typeMethod == expectedMethod {
+												found = true
+											}
+										}
+										if !found {
+											t.Errorf("%s: unexpected method %s on board.%s", pos, typeMethod, name)
+										}
+									}
+								}
+							default:
+								t.Errorf("%s: unexpected spec: %#v", pos, spec)
+							}
+						}
+					case token.TYPE:
+						// Boards shouldn't define any new types.
+						for _, spec := range decl.Specs {
+							pos := fset.Position(spec.Pos())
+							switch spec := spec.(type) {
+							case *ast.TypeSpec:
+								if !spec.Name.IsExported() {
+									continue
+								}
+								t.Errorf("%s: unexpected type: %s", pos, spec.Name)
+							default:
+								t.Errorf("%s: unexpected spec: %#v", pos, spec)
+							}
+						}
+					default:
+						t.Errorf("%s: unexpected declaration: %#v", pos, decl)
+					}
+				default:
+					t.Logf("%s: unexpected declaration: %#v", pos, decl)
+				}
+			}
+		})
+	}
+}
+
+// Extract the named type from the given AST expression (resolving things like
+// *ast.StarExpr).
+func extractTypeName(x ast.Expr) string {
+	switch value := x.(type) {
+	case *ast.Ident:
+		return value.Name
+	case *ast.CompositeLit:
+		return extractTypeName(value.Type)
+	case *ast.StarExpr:
+		return extractTypeName(value.X)
+	case *ast.UnaryExpr:
+		return extractTypeName(value.X)
+	default:
+		return "<unknown>"
+	}
+}