mirror of
https://github.com/Crocmagnon/display-epaper.git
synced 2024-10-16 13:28:19 +02:00
321 lines
6 KiB
Go
321 lines
6 KiB
Go
package epd
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import (
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"fmt"
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"image"
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"log"
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"periph.io/x/conn/v3/gpio"
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"periph.io/x/conn/v3/physic"
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"periph.io/x/conn/v3/spi"
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"periph.io/x/conn/v3/spi/spireg"
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"periph.io/x/host/v3/bcm283x"
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"time"
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)
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const (
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Width = 800
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Height = 480
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)
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type EPD struct {
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width int
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height int
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resetPin gpio.PinOut
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dcPin gpio.PinOut
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busyPin gpio.PinIn
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csPin gpio.PinOut
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pwrPin gpio.PinOut
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partFlag byte
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spi spi.Conn
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spiReg spi.PortCloser
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}
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func New() (*EPD, error) {
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epd := &EPD{
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width: Width,
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height: Height,
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resetPin: bcm283x.GPIO17,
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dcPin: bcm283x.GPIO25,
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busyPin: bcm283x.GPIO24,
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csPin: bcm283x.GPIO8,
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pwrPin: bcm283x.GPIO18,
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partFlag: 1,
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}
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return epd, nil
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}
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func (e *EPD) reset() {
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e.resetPin.Out(gpio.High)
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time.Sleep(200 * time.Millisecond)
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e.resetPin.Out(gpio.Low)
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time.Sleep(4 * time.Millisecond)
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e.resetPin.Out(gpio.High)
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time.Sleep(200 * time.Millisecond)
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}
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func (e *EPD) sendCommand(cmd byte) {
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e.dcPin.Out(gpio.Low)
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e.csPin.Out(gpio.Low)
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if _, err := e.spiWrite([]byte{cmd}); err != nil {
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log.Fatalf("writing to spi: %v", err)
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}
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e.csPin.Out(gpio.High)
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}
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func (e *EPD) sendData(data byte) {
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e.dcPin.Out(gpio.High)
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e.csPin.Out(gpio.Low)
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if _, err := e.spiWrite([]byte{data}); err != nil {
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log.Fatalf("writing to spi: %v", err)
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}
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e.csPin.Out(gpio.High)
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}
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func (e *EPD) sendDataSlice(data []byte) {
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e.dcPin.Out(gpio.High)
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toSend := len(data)
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const maxSize = 4096
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if toSend <= maxSize {
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e.csPin.Out(gpio.Low)
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if _, err := e.spiWrite(data); err != nil {
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log.Fatalf("writing to spi: %v", err)
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}
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e.csPin.Out(gpio.High)
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return
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}
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cursor := 0
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for cursor < toSend {
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chunk := data[cursor:min(cursor+maxSize, toSend)]
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e.csPin.Out(gpio.Low)
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if _, err := e.spiWrite(chunk); err != nil {
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log.Fatalf("writing to spi: %v", err)
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}
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e.csPin.Out(gpio.High)
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log.Printf("sent chunk %v\n", cursor)
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cursor = min(cursor+maxSize, toSend)
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}
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log.Printf("sent chunk %v\n", cursor)
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}
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func (e *EPD) spiWrite(write []byte) ([]byte, error) {
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read := make([]byte, len(write))
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if err := e.spi.Tx(write, read); err != nil {
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return nil, fmt.Errorf("tx: %w", err)
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}
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return read, nil
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}
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func (e *EPD) readBusy() {
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e.sendCommand(0x71)
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busy := e.busyPin.Read()
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for busy == gpio.Low {
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e.sendCommand(0x71)
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busy = e.busyPin.Read()
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time.Sleep(200 * time.Millisecond)
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}
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time.Sleep(200 * time.Millisecond)
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}
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func (e *EPD) turnOn() error {
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log.Println("turning on")
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if err := e.resetPin.Out(gpio.Low); err != nil {
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return fmt.Errorf("setting reset pin to low: %w", err)
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}
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if err := e.dcPin.Out(gpio.Low); err != nil {
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return fmt.Errorf("setting dc pin to low: %w", err)
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}
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if err := e.csPin.Out(gpio.Low); err != nil {
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return fmt.Errorf("setting cs pin to low: %w", err)
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}
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if err := e.pwrPin.Out(gpio.High); err != nil {
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return fmt.Errorf("setting pwr pin to low: %w", err)
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}
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var err error
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if e.spiReg, err = spireg.Open("0"); err != nil {
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return fmt.Errorf("opening SPI: %w", err)
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}
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c, err := e.spiReg.Connect(4*physic.MegaHertz, spi.Mode0, 8)
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if err != nil {
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return fmt.Errorf("connecting to SPI: %w", err)
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}
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e.spi = c
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return nil
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}
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func (e *EPD) Init() error {
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log.Println("initializing EPD")
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if err := e.turnOn(); err != nil {
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return fmt.Errorf("turning on: %w", err)
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}
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e.reset()
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e.sendCommand(0x01)
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e.sendDataSlice([]byte{0x07, 0x07, 0x3f, 0x3f})
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e.sendCommand(0x06)
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e.sendDataSlice([]byte{0x17, 0x17, 0x28, 0x17})
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e.sendCommand(0x04)
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time.Sleep(100 * time.Millisecond)
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e.readBusy()
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e.sendCommand(0x00)
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e.sendData(0x0f)
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e.sendCommand(0x61)
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e.sendDataSlice([]byte{0x03, 0x20, 0x01, 0xe0})
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e.sendCommand(0x15)
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e.sendData(0x00)
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e.sendCommand(0x50)
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e.sendDataSlice([]byte{0x11, 0x07})
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e.sendCommand(0x60)
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e.sendData(0x22)
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return nil
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}
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func (e *EPD) InitFast() error {
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log.Println("initializing Fast EPD")
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if err := e.turnOn(); err != nil {
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return fmt.Errorf("turning on: %w", err)
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}
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e.reset()
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e.sendCommand(0x00)
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e.sendData(0x0f)
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e.sendCommand(0x04)
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time.Sleep(100 * time.Millisecond)
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e.readBusy()
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e.sendCommand(0x06)
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e.sendDataSlice([]byte{0x27, 0x27, 0x18, 0x17})
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e.sendCommand(0xe0)
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e.sendData(0x02)
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e.sendCommand(0xe5)
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e.sendData(0x5a)
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e.sendCommand(0x50)
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e.sendDataSlice([]byte{0x11, 0x07})
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return nil
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}
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func (e *EPD) Clear() {
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log.Println("clearing epd")
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e.Fill(White)
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}
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func (e *EPD) Refresh() {
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log.Println("refreshing...")
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e.sendCommand(0x12)
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time.Sleep(100 * time.Millisecond)
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e.readBusy()
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}
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func (e *EPD) Sleep() error {
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log.Println("sleeping display...")
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e.sendCommand(0x02)
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e.readBusy()
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e.sendCommand(0x07)
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e.sendData(0xa5)
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time.Sleep(2 * time.Second)
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if err := e.turnOff(); err != nil {
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return fmt.Errorf("turning off: %w", err)
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}
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return nil
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}
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func (e *EPD) turnOff() error {
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log.Println("turning off...")
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if err := e.spiReg.Close(); err != nil {
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return fmt.Errorf("closing SPI: %w", err)
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}
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e.resetPin.Out(gpio.Low)
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e.dcPin.Out(gpio.Low)
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e.pwrPin.Out(gpio.Low)
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return nil
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}
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type Color int
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const (
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White Color = iota
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Red
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Black
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)
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func (e *EPD) Fill(c Color) {
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log.Println("filling...")
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switch c {
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case White:
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e.Send(image.White, image.Black)
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case Black:
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e.Send(image.Black, image.Black)
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case Red:
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e.Send(image.White, image.White)
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}
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}
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func (e *EPD) Send(black image.Image, red image.Image) {
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if black != nil {
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log.Println("sending black")
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e.sendCommand(0x10) // write bw data
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e.sendImg(black)
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}
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if red != nil {
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log.Println("sending red")
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e.sendCommand(0x13) // write red data
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e.sendImg(red)
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}
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}
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func (e *EPD) sendImg(img image.Image) {
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log.Println("sending img...")
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// TODO check img size
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for row := 0; row < e.height; row++ {
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for col := 0; col < e.width; col += 8 {
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// this loop converts individual pixels into a single byte
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// 8-pixels at a time and then sends that byte to render
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var b byte = 0xFF
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for px := 0; px < 8; px++ {
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var pixel = img.At(col+px, row)
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if isdark(pixel.RGBA()) {
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b &= ^(0x80 >> (px % 8))
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}
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}
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e.sendData(b)
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}
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}
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}
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func isdark(r, g, b, _ uint32) bool {
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return r < 65535 || g < 65535 || b < 65535
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}
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