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