mirror of
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deadprogram
304 lines
7.7 KiB
Go
304 lines
7.7 KiB
Go
// Package epd2in13x implements a driver for Waveshare 2.13in (B & C versions) tri-color e-paper device.
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//
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// Datasheet: https://www.waveshare.com/w/upload/d/d3/2.13inch-e-paper-b-Specification.pdf
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//
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package epd2in13x // import "tinygo.org/x/drivers/waveshare-epd/epd2in13x"
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import (
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"errors"
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"image/color"
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"machine"
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"time"
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"tinygo.org/x/drivers"
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)
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type Config struct {
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Width int16
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Height int16
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NumColors uint8
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}
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type Device struct {
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bus drivers.SPI
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cs machine.Pin
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dc machine.Pin
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rst machine.Pin
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busy machine.Pin
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width int16
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height int16
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buffer [][]uint8
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bufferLength uint32
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}
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type Color uint8
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// New returns a new epd2in13x driver. Pass in a fully configured SPI bus.
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func New(bus drivers.SPI, csPin, dcPin, rstPin, busyPin machine.Pin) Device {
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csPin.Configure(machine.PinConfig{Mode: machine.PinOutput})
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dcPin.Configure(machine.PinConfig{Mode: machine.PinOutput})
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rstPin.Configure(machine.PinConfig{Mode: machine.PinOutput})
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busyPin.Configure(machine.PinConfig{Mode: machine.PinInput})
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return Device{
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bus: bus,
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cs: csPin,
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dc: dcPin,
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rst: rstPin,
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busy: busyPin,
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}
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}
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// Configure sets up the device.
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func (d *Device) Configure(cfg Config) {
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if cfg.Width != 0 {
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d.width = cfg.Width
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} else {
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d.width = 104
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}
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if cfg.Height != 0 {
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d.height = cfg.Height
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} else {
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d.height = 212
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}
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if cfg.NumColors == 0 {
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cfg.NumColors = 3
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} else if cfg.NumColors == 1 {
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cfg.NumColors = 2
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}
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d.bufferLength = (uint32(d.width) * uint32(d.height)) / 8
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d.buffer = make([][]uint8, cfg.NumColors-1)
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for i := range d.buffer {
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d.buffer[i] = make([]uint8, d.bufferLength)
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}
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for i := range d.buffer {
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for j := uint32(0); j < d.bufferLength; j++ {
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d.buffer[i][j] = 0xFF
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}
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}
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d.cs.Low()
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d.dc.Low()
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d.rst.Low()
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d.Reset()
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d.SendCommand(BOOSTER_SOFT_START)
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d.SendData(0x17)
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d.SendData(0x17)
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d.SendData(0x17)
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d.SendCommand(POWER_ON)
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d.WaitUntilIdle()
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d.SendCommand(PANEL_SETTING)
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d.SendData(0x8F)
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d.SendCommand(VCOM_AND_DATA_INTERVAL_SETTING)
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d.SendData(0x37)
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d.SendCommand(RESOLUTION_SETTING)
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d.SendData(uint8(d.width))
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d.SendData(0x00)
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d.SendData(uint8(d.height))
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}
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// Reset resets the device
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func (d *Device) Reset() {
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d.rst.Low()
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time.Sleep(200 * time.Millisecond)
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d.rst.High()
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time.Sleep(200 * time.Millisecond)
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}
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// DeepSleep puts the display into deepsleep
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func (d *Device) DeepSleep() {
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d.SendCommand(POWER_OFF)
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d.WaitUntilIdle()
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d.SendCommand(DEEP_SLEEP)
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d.SendData(0xA5)
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}
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// SendCommand sends a command to the display
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func (d *Device) SendCommand(command uint8) {
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d.sendDataCommand(true, command)
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}
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// SendData sends a data byte to the display
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func (d *Device) SendData(data uint8) {
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d.sendDataCommand(false, data)
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}
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// sendDataCommand sends image data or a command to the screen
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func (d *Device) sendDataCommand(isCommand bool, data uint8) {
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if isCommand {
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d.dc.Low()
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} else {
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d.dc.High()
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}
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d.cs.Low()
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d.bus.Transfer(data)
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d.cs.High()
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}
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// SetPixel modifies the internal buffer in a single pixel.
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// The display have 3 colors: black, white and a third color that could be red or yellow
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// We use RGBA(0,0,0, 255) as white (transparent)
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// RGBA(1-255,0,0,255) as colored (red or yellow)
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// Anything else as black
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func (d *Device) SetPixel(x int16, y int16, c color.RGBA) {
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if x < 0 || x >= d.width || y < 0 || y >= d.height {
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return
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}
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if c.R != 0 && c.G == 0 && c.B == 0 { // COLORED
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d.SetEPDPixel(x, y, COLORED)
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} else if c.G != 0 || c.B != 0 { // BLACK
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d.SetEPDPixel(x, y, BLACK)
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} else { // WHITE / EMPTY
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d.SetEPDPixel(x, y, WHITE)
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}
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}
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// SetEPDPixel modifies the internal buffer in a single pixel.
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func (d *Device) SetEPDPixel(x int16, y int16, c Color) {
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if x < 0 || x >= d.width || y < 0 || y >= d.height {
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return
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}
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byteIndex := (x + y*d.width) / 8
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if c == WHITE {
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d.buffer[BLACK-1][byteIndex] |= 0x80 >> uint8(x%8)
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d.buffer[COLORED-1][byteIndex] |= 0x80 >> uint8(x%8)
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} else if c == COLORED {
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d.buffer[BLACK-1][byteIndex] |= 0x80 >> uint8(x%8)
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d.buffer[COLORED-1][byteIndex] &^= 0x80 >> uint8(x%8)
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} else { // BLACK
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d.buffer[COLORED-1][byteIndex] |= 0x80 >> uint8(x%8)
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d.buffer[BLACK-1][byteIndex] &^= 0x80 >> uint8(x%8)
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}
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}
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// Display sends the buffer (if any) to the screen.
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func (d *Device) Display() error {
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d.SendCommand(DATA_START_TRANSMISSION_1) // black
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time.Sleep(2 * time.Millisecond)
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for i := uint32(0); i < d.bufferLength; i++ {
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d.SendData(d.buffer[BLACK-1][i])
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}
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time.Sleep(2 * time.Millisecond)
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d.SendCommand(DATA_START_TRANSMISSION_2) // red
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time.Sleep(2 * time.Millisecond)
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for i := uint32(0); i < d.bufferLength; i++ {
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d.SendData(d.buffer[COLORED-1][i])
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}
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time.Sleep(2 * time.Millisecond)
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d.SendCommand(DISPLAY_REFRESH)
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return nil
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}
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// SetDisplayRect sends a rectangle of data at specific coordinates to the device SRAM directly
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func (d *Device) SetDisplayRect(buffer [][]uint8, x int16, y int16, w int16, h int16) error {
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if w%8 != 0 {
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return errors.New("rectangle width needs to be a multiple of 8")
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}
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for i := range buffer {
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if int16(len(buffer[i])) < (w/8)*h {
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return errors.New("buffer has the wrong size")
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}
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}
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d.SendCommand(PARTIAL_IN)
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d.SendCommand(PARTIAL_WINDOW)
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d.SendData(uint8(x) & 0xF8)
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d.SendData(((uint8(x) & 0xF8) + uint8(w) - 1) | 0x07)
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d.SendData(uint8(y) >> 8)
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d.SendData(uint8(y) & 0xFF)
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d.SendData(uint8(y+h-1) >> 8)
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d.SendData(uint8(y+h-1) & 0xFF)
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d.SendData(0x01)
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time.Sleep(2 * time.Millisecond)
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d.SendCommand(DATA_START_TRANSMISSION_1)
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for i := int16(0); i < (w/8)*h; i++ {
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d.SendData(buffer[BLACK-1][i])
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}
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time.Sleep(2 * time.Millisecond)
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if len(buffer) > 1 {
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d.SendCommand(DATA_START_TRANSMISSION_2)
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for i := int16(0); i < (w/8)*h; i++ {
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d.SendData(buffer[COLORED-1][i])
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}
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time.Sleep(2 * time.Millisecond)
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}
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d.SendCommand(PARTIAL_OUT)
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return nil
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}
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// SetDisplayRectColor sends a rectangle of data at specific coordinates to the device SRAM directly
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func (d *Device) SetDisplayRectColor(buffer []uint8, x int16, y int16, w int16, h int16, c Color) error {
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if w%8 != 0 {
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return errors.New("rectangle width needs to be a multiple of 8")
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}
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if int16(len(buffer)) < (w/8)*h {
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return errors.New("buffer has the wrong size")
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}
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if c == WHITE {
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return errors.New("wrong color")
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}
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d.SendCommand(PARTIAL_IN)
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d.SendCommand(PARTIAL_WINDOW)
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d.SendData(uint8(x) & 0xF8)
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d.SendData(((uint8(x) & 0xF8) + uint8(w) - 1) | 0x07)
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d.SendData(uint8(y) >> 8)
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d.SendData(uint8(y) & 0xFF)
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d.SendData(uint8(y+h-1) >> 8)
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d.SendData(uint8(y+h-1) & 0xFF)
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d.SendData(0x01)
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time.Sleep(2 * time.Millisecond)
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if c == COLORED {
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d.SendCommand(DATA_START_TRANSMISSION_2)
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} else {
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d.SendCommand(DATA_START_TRANSMISSION_1)
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}
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for i := int16(0); i < (w/8)*h; i++ {
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d.SendData(buffer[i])
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}
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time.Sleep(2 * time.Millisecond)
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d.SendCommand(PARTIAL_OUT)
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return nil
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}
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// ClearDisplay erases the device SRAM
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func (d *Device) ClearDisplay() {
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d.SendCommand(DATA_START_TRANSMISSION_1) // black
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time.Sleep(2 * time.Millisecond)
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for i := uint32(0); i < d.bufferLength; i++ {
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d.SendData(0xFF)
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}
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time.Sleep(2 * time.Millisecond)
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d.SendCommand(DATA_START_TRANSMISSION_2) // red
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time.Sleep(2 * time.Millisecond)
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for i := uint32(0); i < d.bufferLength; i++ {
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d.SendData(0xFF)
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}
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time.Sleep(2 * time.Millisecond)
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}
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// WaitUntilIdle waits until the display is ready
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func (d *Device) WaitUntilIdle() {
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for !d.busy.Get() {
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time.Sleep(100 * time.Millisecond)
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}
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}
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// IsBusy returns the busy status of the display
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func (d *Device) IsBusy() bool {
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return d.busy.Get()
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}
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// ClearBuffer sets the buffer to 0xFF (white)
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func (d *Device) ClearBuffer() {
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for i := uint8(0); i < uint8(len(d.buffer)); i++ {
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for j := uint32(0); j < d.bufferLength; j++ {
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d.buffer[i][j] = 0xFF
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}
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}
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}
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// Size returns the current size of the display.
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func (d *Device) Size() (w, h int16) {
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return d.width, d.height
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}
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