mirror of
https://github.com/tinygo-org/drivers.git
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waveshare(ssd1680): Add driver for waveshare 2.9 inch v2 epaper
- Waveshare 2.9in v2 epaper uses a different IC (SSD1680) than the v1. This commit
takes the code from v1 and modifies them for v2.
- Datasheets:
- https://files.waveshare.com/upload/7/79/2.9inch-e-paper-v2-specification.pdf
- https://cdn-learn.adafruit.com/assets/assets/000/097/631/original/SSD1680_Datasheet.pdf?1607625960
- Code reference: https://github.com/waveshareteam/e-Paper/raw/refs/heads/master/RaspberryPi_JetsonNano/c/lib/e-Paper/EPD_2in9_V2.c
- Fixes #627
Signed-off-by: Avinal Kumar <avinal.xlvii@gmail.com>
Assisted-by: Claude Code
This commit is contained in:
Avinal Kumar
Ron Evans
@@ -0,0 +1,465 @@
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// Package epd2in9v2 implements a driver for the Waveshare 2.9in V2 black and white e-paper display.
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//
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// This is for the V2 device using the SSD1680 chipset. For the V1 device (using IL3820),
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// use the epd2in9 package instead.
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//
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// Datasheet:
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// https://files.waveshare.com/upload/7/79/2.9inch-e-paper-v2-specification.pdf
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// https://cdn-learn.adafruit.com/assets/assets/000/097/631/original/SSD1680_Datasheet.pdf?1607625960
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//
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// Reference: https://github.com/waveshareteam/e-Paper/tree/master/RaspberryPi_JetsonNano/c/lib/e-Paper
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package epd2in9v2 // import "tinygo.org/x/drivers/waveshare-epd/epd2in9v2"
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import (
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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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Rotation Rotation
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Speed Speed
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Blocking bool
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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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rotation Rotation
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speed Speed
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blocking bool
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}
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type Rotation uint8
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type Speed uint8
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// LUT for normal full refresh (~2s)
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var lutDefault = [159]uint8{
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0x80, 0x66, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x40, 0x0, 0x0, 0x0,
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0x10, 0x66, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x20, 0x0, 0x0, 0x0,
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0x80, 0x66, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x40, 0x0, 0x0, 0x0,
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0x10, 0x66, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x20, 0x0, 0x0, 0x0,
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0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
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0x14, 0x8, 0x0, 0x0, 0x0, 0x0, 0x1,
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0xA, 0xA, 0x0, 0xA, 0xA, 0x0, 0x1,
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0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
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0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
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0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
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0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
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0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
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0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
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0x14, 0x8, 0x0, 0x1, 0x0, 0x0, 0x1,
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0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x1,
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0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
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0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
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0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x0, 0x0, 0x0,
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0x22, 0x17, 0x41, 0x0, 0x32, 0x36,
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}
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// LUT for fast full refresh (~1s)
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var lutFast = [159]uint8{
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0x90, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x60, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x90, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x60, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x19, 0x19, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x24, 0x42, 0x22, 0x22, 0x23, 0x32, 0x00, 0x00, 0x00,
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0x22, 0x17, 0x41, 0xAE, 0x32, 0x38,
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}
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// LUT for partial refresh
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var lutPartial = [159]uint8{
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0x0, 0x40, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
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0x80, 0x80, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
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0x40, 0x40, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
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0x0, 0x80, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
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0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
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0x0A, 0x0, 0x0, 0x0, 0x0, 0x0, 0x2,
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0x1, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
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0x1, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
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0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
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0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
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0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
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0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
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0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
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0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
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0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
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0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
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0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
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0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x0, 0x0, 0x0,
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0x22, 0x17, 0x41, 0xB0, 0x32, 0x36,
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}
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// New returns a new epd2in9v2 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 = EPD_WIDTH
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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 = EPD_HEIGHT
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}
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d.rotation = cfg.Rotation
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d.speed = cfg.Speed
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d.blocking = cfg.Blocking
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d.bufferLength = (uint32(d.width) * uint32(d.height)) / 8
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d.buffer = make([]uint8, d.bufferLength)
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for i := uint32(0); i < d.bufferLength; i++ {
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d.buffer[i] = 0xFF
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}
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d.Reset()
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time.Sleep(100 * time.Millisecond)
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d.WaitUntilIdle()
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d.SendCommand(SW_RESET)
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d.WaitUntilIdle()
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d.SendCommand(DRIVER_OUTPUT_CONTROL)
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d.SendData(uint8((d.height - 1) & 0xFF))
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d.SendData(uint8((d.height - 1) >> 8))
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d.SendData(0x00)
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d.SendCommand(DATA_ENTRY_MODE)
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d.SendData(0x03)
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d.setWindow(0, 0, d.width-1, d.height-1)
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if cfg.Speed == SPEED_FAST {
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d.SendCommand(BORDER_WAVEFORM_CONTROL)
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d.SendData(0x05)
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}
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d.SendCommand(DISPLAY_UPDATE_CONTROL_1)
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d.SendData(0x00)
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d.SendData(0x80)
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d.setCursor(0, 0)
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d.WaitUntilIdle()
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switch cfg.Speed {
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case SPEED_FAST:
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d.setLUTByHost(&lutFast)
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default:
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d.setLUTByHost(&lutDefault)
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}
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}
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// HardwareReset resets the device via the RST pin.
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func (d *Device) Reset() {
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d.rst.High()
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time.Sleep(10 * time.Millisecond)
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d.rst.Low()
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time.Sleep(2 * time.Millisecond)
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d.rst.High()
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time.Sleep(10 * time.Millisecond)
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}
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// SendCommand sends a command byte to the display.
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func (d *Device) SendCommand(command uint8) {
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d.dc.Low()
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d.cs.Low()
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d.bus.Transfer(command)
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d.cs.High()
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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.dc.High()
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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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// WaitUntilIdle waits until the display is ready.
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// On SSD1680, BUSY pin is HIGH when busy, LOW when idle.
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func (d *Device) WaitUntilIdle() {
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for d.busy.Get() {
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time.Sleep(50 * time.Millisecond)
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}
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time.Sleep(50 * time.Millisecond)
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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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// SetPixel modifies the internal buffer in a single pixel.
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// Uses color.RGBA where black (0,0,0) = black pixel, anything else = white pixel.
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func (d *Device) SetPixel(x int16, y int16, c color.RGBA) {
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x, y = d.xy(x, y)
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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 := (y * (d.width / 8)) + (x / 8)
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if c.R == 0 && c.G == 0 && c.B == 0 {
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d.buffer[byteIndex] &^= 0x80 >> uint8(x%8)
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} else {
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d.buffer[byteIndex] |= 0x80 >> uint8(x%8)
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}
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}
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// Display sends the buffer to the screen.
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func (d *Device) Display() error {
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if d.blocking {
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d.WaitUntilIdle()
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}
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d.setCursor(0, 0)
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d.SendCommand(WRITE_RAM_BW)
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for i := uint32(0); i < d.bufferLength; i++ {
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d.SendData(d.buffer[i])
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}
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d.turnOnDisplay()
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if d.blocking {
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d.WaitUntilIdle()
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}
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return nil
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}
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// DisplayWithBase writes the buffer to both BW and RED RAM then refreshes.
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// This is useful before partial updates to set the base image.
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func (d *Device) DisplayWithBase() error {
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if d.blocking {
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d.WaitUntilIdle()
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}
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d.setCursor(0, 0)
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d.SendCommand(WRITE_RAM_BW)
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for i := uint32(0); i < d.bufferLength; i++ {
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d.SendData(d.buffer[i])
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}
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d.setCursor(0, 0)
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d.SendCommand(WRITE_RAM_RED)
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for i := uint32(0); i < d.bufferLength; i++ {
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d.SendData(d.buffer[i])
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}
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d.turnOnDisplay()
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|
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if d.blocking {
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d.WaitUntilIdle()
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}
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return nil
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}
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// DisplayPartial performs a partial refresh of the display.
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// Call DisplayWithBase first to set the base image before using partial updates.
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func (d *Device) DisplayPartial() error {
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d.rst.Low()
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time.Sleep(1 * time.Millisecond)
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d.rst.High()
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time.Sleep(2 * time.Millisecond)
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d.setLUT(&lutPartial)
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d.SendCommand(OTP_SELECTION_CONTROL)
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d.SendData(0x00)
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d.SendData(0x00)
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d.SendData(0x00)
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d.SendData(0x00)
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d.SendData(0x00)
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d.SendData(0x40)
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d.SendData(0x00)
|
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d.SendData(0x00)
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d.SendData(0x00)
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d.SendData(0x00)
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|
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d.SendCommand(BORDER_WAVEFORM_CONTROL)
|
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d.SendData(0x80)
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|
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d.SendCommand(DISPLAY_UPDATE_CONTROL_2)
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d.SendData(0xC0)
|
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d.SendCommand(MASTER_ACTIVATION)
|
||||
d.WaitUntilIdle()
|
||||
|
||||
d.setWindow(0, 0, d.width-1, d.height-1)
|
||||
d.setCursor(0, 0)
|
||||
|
||||
d.SendCommand(WRITE_RAM_BW)
|
||||
for i := uint32(0); i < d.bufferLength; i++ {
|
||||
d.SendData(d.buffer[i])
|
||||
}
|
||||
|
||||
d.turnOnDisplayPartial()
|
||||
d.WaitUntilIdle()
|
||||
return nil
|
||||
}
|
||||
|
||||
// ClearDisplay erases the display.
|
||||
func (d *Device) ClearDisplay() {
|
||||
d.ClearBuffer()
|
||||
d.Display()
|
||||
}
|
||||
|
||||
// ClearBuffer sets the buffer to 0xFF (white).
|
||||
func (d *Device) ClearBuffer() {
|
||||
for i := uint32(0); i < d.bufferLength; i++ {
|
||||
d.buffer[i] = 0xFF
|
||||
}
|
||||
}
|
||||
|
||||
// Size returns the current size of the display.
|
||||
func (d *Device) Size() (w, h int16) {
|
||||
if d.rotation == ROTATION_90 || d.rotation == ROTATION_270 {
|
||||
return d.height, d.width
|
||||
}
|
||||
return d.width, d.height
|
||||
}
|
||||
|
||||
// SetRotation changes the rotation (clock-wise) of the device.
|
||||
func (d *Device) SetRotation(rotation Rotation) {
|
||||
d.rotation = rotation
|
||||
}
|
||||
|
||||
// SetBlocking changes the blocking flag of the device.
|
||||
func (d *Device) SetBlocking(blocking bool) {
|
||||
d.blocking = blocking
|
||||
}
|
||||
|
||||
// SetSpeed changes the refresh speed and reconfigures the device.
|
||||
func (d *Device) SetSpeed(speed Speed) {
|
||||
d.Configure(Config{
|
||||
Width: d.width,
|
||||
Height: d.height,
|
||||
Rotation: d.rotation,
|
||||
Speed: speed,
|
||||
Blocking: d.blocking,
|
||||
})
|
||||
}
|
||||
|
||||
// Sleep puts the display into deep sleep mode. A hardware reset is needed to wake it.
|
||||
func (d *Device) Sleep() {
|
||||
d.SendCommand(DEEP_SLEEP_MODE)
|
||||
d.SendData(0x01)
|
||||
time.Sleep(100 * time.Millisecond)
|
||||
}
|
||||
|
||||
// PowerOff disables the display analog/clock. Lighter than Sleep.
|
||||
func (d *Device) PowerOff() {
|
||||
d.SendCommand(DISPLAY_UPDATE_CONTROL_2)
|
||||
d.SendData(0x03)
|
||||
d.SendCommand(MASTER_ACTIVATION)
|
||||
d.WaitUntilIdle()
|
||||
}
|
||||
|
||||
func (d *Device) xy(x, y int16) (int16, int16) {
|
||||
switch d.rotation {
|
||||
case NO_ROTATION:
|
||||
return x, y
|
||||
case ROTATION_90:
|
||||
return d.width - y - 1, x
|
||||
case ROTATION_180:
|
||||
return d.width - x - 1, d.height - y - 1
|
||||
case ROTATION_270:
|
||||
return y, d.height - x - 1
|
||||
}
|
||||
return x, y
|
||||
}
|
||||
|
||||
func (d *Device) setWindow(xStart, yStart, xEnd, yEnd int16) {
|
||||
d.SendCommand(SET_RAM_X_ADDRESS)
|
||||
d.SendData(uint8((xStart >> 3) & 0xFF))
|
||||
d.SendData(uint8((xEnd >> 3) & 0xFF))
|
||||
|
||||
d.SendCommand(SET_RAM_Y_ADDRESS)
|
||||
d.SendData(uint8(yStart & 0xFF))
|
||||
d.SendData(uint8((yStart >> 8) & 0xFF))
|
||||
d.SendData(uint8(yEnd & 0xFF))
|
||||
d.SendData(uint8((yEnd >> 8) & 0xFF))
|
||||
}
|
||||
|
||||
func (d *Device) setCursor(x, y int16) {
|
||||
d.SendCommand(SET_RAM_X_COUNTER)
|
||||
d.SendData(uint8(x & 0xFF))
|
||||
|
||||
d.SendCommand(SET_RAM_Y_COUNTER)
|
||||
d.SendData(uint8(y & 0xFF))
|
||||
d.SendData(uint8((y >> 8) & 0xFF))
|
||||
}
|
||||
|
||||
func (d *Device) turnOnDisplay() {
|
||||
d.SendCommand(DISPLAY_UPDATE_CONTROL_2)
|
||||
d.SendData(0xC7)
|
||||
d.SendCommand(MASTER_ACTIVATION)
|
||||
d.WaitUntilIdle()
|
||||
}
|
||||
|
||||
func (d *Device) turnOnDisplayPartial() {
|
||||
d.SendCommand(DISPLAY_UPDATE_CONTROL_2)
|
||||
d.SendData(0x0F)
|
||||
d.SendCommand(MASTER_ACTIVATION)
|
||||
d.WaitUntilIdle()
|
||||
}
|
||||
|
||||
func (d *Device) setLUT(lut *[159]uint8) {
|
||||
d.SendCommand(WRITE_LUT_REGISTER)
|
||||
for i := 0; i < 153; i++ {
|
||||
d.SendData(lut[i])
|
||||
}
|
||||
d.WaitUntilIdle()
|
||||
}
|
||||
|
||||
func (d *Device) setLUTByHost(lut *[159]uint8) {
|
||||
d.setLUT(lut)
|
||||
|
||||
d.SendCommand(END_OPTION)
|
||||
d.SendData(lut[153])
|
||||
|
||||
d.SendCommand(GATE_DRIVING_VOLTAGE)
|
||||
d.SendData(lut[154])
|
||||
|
||||
d.SendCommand(SOURCE_DRIVING_VOLTAGE)
|
||||
d.SendData(lut[155])
|
||||
d.SendData(lut[156])
|
||||
d.SendData(lut[157])
|
||||
|
||||
d.SendCommand(WRITE_VCOM_REGISTER)
|
||||
d.SendData(lut[158])
|
||||
}
|
||||
@@ -0,0 +1,50 @@
|
||||
package epd2in9v2
|
||||
|
||||
// Commands from SSD1680 datasheet
|
||||
const (
|
||||
EPD_WIDTH = 128
|
||||
EPD_HEIGHT = 296
|
||||
|
||||
DRIVER_OUTPUT_CONTROL = 0x01
|
||||
GATE_DRIVING_VOLTAGE = 0x03
|
||||
SOURCE_DRIVING_VOLTAGE = 0x04
|
||||
DEEP_SLEEP_MODE = 0x10
|
||||
DATA_ENTRY_MODE = 0x11
|
||||
SW_RESET = 0x12
|
||||
MASTER_ACTIVATION = 0x20
|
||||
DISPLAY_UPDATE_CONTROL_1 = 0x21
|
||||
DISPLAY_UPDATE_CONTROL_2 = 0x22
|
||||
WRITE_RAM_BW = 0x24
|
||||
WRITE_RAM_RED = 0x26
|
||||
VCOM_SENSE = 0x28
|
||||
VCOM_SENSE_DURATION = 0x29
|
||||
PROGRAM_VCOM_OTP = 0x2A
|
||||
WRITE_VCOM_CONTROL = 0x2B
|
||||
WRITE_VCOM_REGISTER = 0x2C
|
||||
OTP_READ_DISPLAY_OPTION = 0x2D
|
||||
USER_ID_READ = 0x2E
|
||||
PROGRAM_WS_OTP = 0x30
|
||||
LOAD_WS_OTP = 0x31
|
||||
WRITE_LUT_REGISTER = 0x32
|
||||
PROGRAM_OTP_SELECTION = 0x36
|
||||
OTP_SELECTION_CONTROL = 0x37
|
||||
WRITE_USER_ID = 0x38
|
||||
OTP_PROGRAM_MODE = 0x39
|
||||
BORDER_WAVEFORM_CONTROL = 0x3C
|
||||
END_OPTION = 0x3F
|
||||
SET_RAM_X_ADDRESS = 0x44
|
||||
SET_RAM_Y_ADDRESS = 0x45
|
||||
SET_RAM_X_COUNTER = 0x4E
|
||||
SET_RAM_Y_COUNTER = 0x4F
|
||||
SET_ANALOG_BLOCK_CONTROL = 0x74
|
||||
SET_DIGITAL_BLOCK_CONTROL = 0x7E
|
||||
|
||||
NO_ROTATION Rotation = 0
|
||||
ROTATION_90 Rotation = 1
|
||||
ROTATION_180 Rotation = 2
|
||||
ROTATION_270 Rotation = 3
|
||||
|
||||
SPEED_DEFAULT Speed = 0
|
||||
SPEED_FAST Speed = 1
|
||||
SPEED_PARTIAL Speed = 2
|
||||
)
|
||||
Reference in New Issue
Block a user