feat(firmware): drive GDEY0579T93 EPD via dual-SSD1683 driver
Add a thin dual-SSD1683 driver (src/epd.rs, ported from GxEPD2's GxEPD2_579_GDEY0579T93) for the 792x272 e-paper panel: reset/init, RAM addressing, the split-and-mirror full-frame blit across the master/slave seam at x=396, and full-refresh waveform. Frame implements embedded-graphics' DrawTarget. Replace the Spike 1 blink harness in main.rs with the Spike 2 test: SPI at 4 MHz over SCK 12 / DIN 11 / CS 7 / DC 6 / RST 5 / BUSY 4, alternating normal/inverted frames with a seam-straddling circle, "Typoena", and the build tag. Verified on hardware 2026-07-04.
This commit is contained in:
Julien Calixte
@@ -27,6 +27,7 @@ log = "0.4"
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esp-idf-svc = { version = "0.52.1", features = ["critical-section", "embassy-time-driver", "embassy-sync"] }
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# Remove `generic-queue-8` if you plan to use `embassy-time` WITH `embassy-executor`
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embassy-time = { version = "0.5", features = ["generic-queue-8"] }
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embedded-graphics = "0.8"
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[build-dependencies]
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embuild = "0.33"
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321
firmware/src/epd.rs
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321
firmware/src/epd.rs
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@@ -0,0 +1,321 @@
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//! Thin SSD1683 driver for the GDEY0579T93 (792×272) e-paper panel.
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//!
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//! This panel is a *dual-controller* device: 792×272 exceeds one SSD1683's
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//! 400×300 limit, so it is driven as a **master** (command offset `0x00`) +
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//! **slave** (`0x80`) pair, with the framebuffer split between them. The
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//! command sequences and RAM-window math are ported faithfully from GxEPD2's
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//! `GxEPD2_579_GDEY0579T93` (Jean-Marc Zingg), itself based on the Good
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//! Display factory demo. See `docs/v0.1-mvp-technical.md` (Spike 2) and
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//! ADR-003.
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//!
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//! **Spike 2a scope:** hardware reset, init, uniform full-screen fill, full
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//! refresh — enough to prove wiring + SPI + both controllers + refresh.
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//! Text (an `embedded-graphics` `DrawTarget` + the per-quadrant blit from
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//! GxEPD2's `_writeFromImage`) is Spike 2b.
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use embedded_graphics::pixelcolor::BinaryColor;
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use embedded_graphics::prelude::*;
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use esp_idf_svc::hal::delay::FreeRtos;
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use esp_idf_svc::hal::gpio::{Input, Output, PinDriver};
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use esp_idf_svc::hal::spi::{SpiBusDriver, SpiDriver};
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use esp_idf_svc::sys::EspError;
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pub const WIDTH: u16 = 792;
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pub const HEIGHT: u16 = 272;
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/// Each controller drives one half. SSD1683 X is byte-addressed; 396 px
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/// rounds up to 50 bytes (400 px) of RAM width, full panel height (272 rows).
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const CTRL_BYTES_W: usize = 50;
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const CTRL_BYTES: usize = CTRL_BYTES_W * HEIGHT as usize; // 50 * 272 = 13600
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/// Full-frame 1-bit framebuffer: 792 px = 99 bytes per row, MSB-first,
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/// 1 = white, 0 = black (SSD16xx convention).
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pub const FB_BYTES_W: usize = (WIDTH / 8) as usize; // 99
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pub const FB_BYTES: usize = FB_BYTES_W * HEIGHT as usize; // 26928
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/// In-memory 792×272 1-bit frame, drawable via `embedded-graphics`.
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/// `BinaryColor::On` = black ink, `Off` = white paper.
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pub struct Frame {
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buf: Vec<u8>,
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}
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impl Frame {
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pub fn new_white() -> Self {
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Self { buf: vec![0xFF; FB_BYTES] }
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}
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pub fn new_black() -> Self {
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Self { buf: vec![0x00; FB_BYTES] }
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}
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pub fn bytes(&self) -> &[u8] {
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&self.buf
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}
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}
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impl OriginDimensions for Frame {
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fn size(&self) -> Size {
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Size::new(WIDTH as u32, HEIGHT as u32)
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}
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}
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impl DrawTarget for Frame {
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type Color = BinaryColor;
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type Error = core::convert::Infallible;
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fn draw_iter<I>(&mut self, pixels: I) -> Result<(), Self::Error>
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where
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I: IntoIterator<Item = Pixel<Self::Color>>,
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{
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for Pixel(p, color) in pixels {
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if (0..WIDTH as i32).contains(&p.x) && (0..HEIGHT as i32).contains(&p.y) {
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let idx = p.y as usize * FB_BYTES_W + p.x as usize / 8;
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let bit = 0x80u8 >> (p.x % 8);
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match color {
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BinaryColor::On => self.buf[idx] &= !bit, // black ink
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BinaryColor::Off => self.buf[idx] |= bit, // white paper
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}
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}
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}
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Ok(())
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}
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}
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/// Max bytes per SPI transfer; matches the DMA size configured in `main`.
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const SPI_CHUNK: usize = 4096;
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pub struct Epd<'d> {
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spi: SpiBusDriver<'d, SpiDriver<'d>>,
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dc: PinDriver<'d, Output>,
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rst: PinDriver<'d, Output>,
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cs: PinDriver<'d, Output>,
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busy: PinDriver<'d, Input>,
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}
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impl<'d> Epd<'d> {
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pub fn new(
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spi: SpiBusDriver<'d, SpiDriver<'d>>,
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dc: PinDriver<'d, Output>,
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rst: PinDriver<'d, Output>,
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cs: PinDriver<'d, Output>,
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busy: PinDriver<'d, Input>,
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) -> Self {
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Self { spi, dc, rst, cs, busy }
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}
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// ---- low-level SPI framing (DC low = command, DC high = data) ----
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fn cmd(&mut self, c: u8) -> Result<(), EspError> {
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self.dc.set_low()?;
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self.cs.set_low()?;
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self.spi.write(&[c])?;
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self.cs.set_high()?;
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Ok(())
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}
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fn data(&mut self, bytes: &[u8]) -> Result<(), EspError> {
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self.dc.set_high()?;
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self.cs.set_low()?;
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for chunk in bytes.chunks(SPI_CHUNK) {
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self.spi.write(chunk)?;
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}
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self.cs.set_high()?;
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Ok(())
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}
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/// BUSY is active-HIGH on this panel (GxEPD2 constructs with `HIGH`).
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fn wait_while_busy(&mut self, timeout_ms: u32) -> Result<(), EspError> {
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let mut waited = 0;
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while self.busy.is_high() {
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FreeRtos::delay_ms(1);
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waited += 1;
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if waited >= timeout_ms {
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log::warn!("EPD BUSY still high after {timeout_ms} ms — continuing");
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break;
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}
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}
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Ok(())
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}
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// ---- panel bring-up ----
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/// Hardware reset (RST is active-low). ~20 ms pulses per GxEPD2 default.
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pub fn reset(&mut self) -> Result<(), EspError> {
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self.rst.set_high()?;
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FreeRtos::delay_ms(20);
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self.rst.set_low()?;
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FreeRtos::delay_ms(20);
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self.rst.set_high()?;
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FreeRtos::delay_ms(20);
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self.wait_while_busy(100)?;
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Ok(())
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}
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/// Port of GxEPD2 `_InitDisplay` (B/W mode). The `0x20` master
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/// activations load the temperature value and LUT.
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pub fn init(&mut self) -> Result<(), EspError> {
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self.cmd(0x12)?; // SWRESET
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FreeRtos::delay_ms(10);
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self.wait_while_busy(100)?;
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self.cmd(0x18)?; // temperature sensor control
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self.data(&[0x80])?; // internal sensor
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self.cmd(0x22)?; // display update control 2
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self.data(&[0xB1])?; // enable clock, load temp, load LUT (B/W), disable clock
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self.cmd(0x20)?; // master activation
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FreeRtos::delay_ms(10);
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self.wait_while_busy(100)?;
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self.cmd(0x1A)?; // write to temperature register
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self.data(&[0x64, 0x00])?;
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self.cmd(0x22)?;
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self.data(&[0x91])?; // load temp, load LUT (B/W), disable clock
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self.cmd(0x20)?;
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FreeRtos::delay_ms(10);
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self.wait_while_busy(100)?;
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Ok(())
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}
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/// Port of GxEPD2 `_setPartialRamArea`. `target` is `0x00` (master) or
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/// `0x80` (slave); `mode` selects X/Y increment/decrement (0x00–0x03).
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fn set_ram_area(
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&mut self,
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x: u16,
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y: u16,
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w: u16,
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h: u16,
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mode: u8,
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target: u8,
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) -> Result<(), EspError> {
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self.cmd(0x11 | target)?; // data entry mode
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self.data(&[mode])?;
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let xl = (x / 8) as u8;
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let xh = ((x + w - 1) / 8) as u8;
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let ys = [(y % 256) as u8, (y / 256) as u8];
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let ye = [((y + h - 1) % 256) as u8, ((y + h - 1) / 256) as u8];
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match mode {
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0x03 => {
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// X increment, Y increment
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self.cmd(0x44 | target)?;
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self.data(&[xl, xh])?;
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self.cmd(0x45 | target)?;
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self.data(&[ys[0], ys[1], ye[0], ye[1]])?;
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self.cmd(0x4E | target)?;
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self.data(&[xl])?;
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self.cmd(0x4F | target)?;
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self.data(&[ys[0], ys[1]])?;
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}
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0x02 => {
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// X decrement, Y increment
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self.cmd(0x44 | target)?;
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self.data(&[xh, xl])?;
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self.cmd(0x45 | target)?;
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self.data(&[ys[0], ys[1], ye[0], ye[1]])?;
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self.cmd(0x4E | target)?;
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self.data(&[xh])?;
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self.cmd(0x4F | target)?;
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self.data(&[ys[0], ys[1]])?;
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}
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0x01 => {
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// X increment, Y decrement
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self.cmd(0x44 | target)?;
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self.data(&[xl, xh])?;
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self.cmd(0x45 | target)?;
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self.data(&[ye[0], ye[1], ys[0], ys[1]])?;
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self.cmd(0x4E | target)?;
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self.data(&[xl])?;
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self.cmd(0x4F | target)?;
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self.data(&[ye[0], ye[1]])?;
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}
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_ => {
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// 0x00: X decrement, Y decrement
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self.cmd(0x44 | target)?;
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self.data(&[xh, xl])?;
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self.cmd(0x45 | target)?;
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self.data(&[ye[0], ye[1], ys[0], ys[1]])?;
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self.cmd(0x4E | target)?;
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self.data(&[xh])?;
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self.cmd(0x4F | target)?;
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self.data(&[ye[0], ye[1]])?;
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}
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}
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FreeRtos::delay_ms(2);
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Ok(())
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}
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/// Fill one RAM bank (`0x24` current or `0x26` previous) on both
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/// controllers with a constant byte. One clean full-coverage window per
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/// controller (slave = left half `0x80`, master = right half `0x00`) —
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/// simpler and more complete than GxEPD2's overlapping-window fill, which
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/// only matters for a constant value anyway.
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fn write_buffer(&mut self, command: u8, value: u8) -> Result<(), EspError> {
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let buf = vec![value; CTRL_BYTES];
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for target in [0x80u8, 0x00u8] {
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self.set_ram_area(0, 0, 400, HEIGHT, 0x03, target)?;
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self.cmd(command | target)?;
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self.data(&buf)?;
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}
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Ok(())
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}
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/// Port of GxEPD2 `refresh(false)` → `_Update_Full` (fast full update).
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fn update_full(&mut self) -> Result<(), EspError> {
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self.set_ram_area(0, 0, WIDTH / 2, HEIGHT, 0x03, 0x80)?; // slave
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self.set_ram_area(0, 0, WIDTH / 2, HEIGHT, 0x03, 0x00)?; // master
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self.cmd(0x21)?; // display update control 1
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self.data(&[0x40, 0x10])?; // bypass RED as 0, cascade
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self.cmd(0x1A)?; // temperature register (fast full update)
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self.data(&[0x64, 0x00])?;
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self.cmd(0x22)?;
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self.data(&[0xD7])?; // fast full update
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self.cmd(0x20)?; // master activation
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self.wait_while_busy(2500)?; // full_refresh_time ≈ 2200 ms
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Ok(())
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}
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/// Fill the whole panel with one value and full-refresh.
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/// `0xFF` = white, `0x00` = black. Port of GxEPD2 `clearScreen`.
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pub fn clear_screen(&mut self, value: u8) -> Result<(), EspError> {
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self.write_buffer(0x26, value)?; // previous
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self.write_buffer(0x24, value)?; // current
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self.update_full()?;
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Ok(())
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}
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/// Blit a full 792×272 framebuffer into one RAM bank on both
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/// controllers. Port of the full-frame case of GxEPD2 `_writeFromImage`:
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/// slave gets panel bytes 0..=49 of each row in X-increment mode; the
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/// master's sources are wired mirrored, so it gets bytes 49..=98 in
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/// bitmap order while the address counter walks RAM 49..=0 (mode 0x02).
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/// The seam byte 49 (px 392..399) lands on both; the 4 columns past each
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/// controller's 396 sources aren't wired.
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fn write_frame_bank(&mut self, command: u8, fb: &[u8]) -> Result<(), EspError> {
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let mut buf = Vec::with_capacity(CTRL_BYTES);
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for y in 0..HEIGHT as usize {
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let row = &fb[y * FB_BYTES_W..(y + 1) * FB_BYTES_W];
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buf.extend_from_slice(&row[..CTRL_BYTES_W]);
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}
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self.set_ram_area(0, 0, WIDTH / 2, HEIGHT, 0x03, 0x80)?; // slave
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self.cmd(command | 0x80)?;
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self.data(&buf)?;
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buf.clear();
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for y in 0..HEIGHT as usize {
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let row = &fb[y * FB_BYTES_W..(y + 1) * FB_BYTES_W];
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buf.extend_from_slice(&row[FB_BYTES_W - CTRL_BYTES_W..]);
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}
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self.set_ram_area(0, 0, WIDTH / 2, HEIGHT, 0x02, 0x00)?; // master
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self.cmd(command)?;
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self.data(&buf)?;
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Ok(())
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}
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/// Show a full 792×272 framebuffer (`FB_BYTES` long) with a full
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/// refresh. Writes both RAM banks so the next differential update has a
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/// consistent "previous" image.
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pub fn display_frame(&mut self, fb: &[u8]) -> Result<(), EspError> {
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assert_eq!(fb.len(), FB_BYTES, "framebuffer must be 99 x 272 bytes");
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self.write_frame_bank(0x26, fb)?; // previous
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self.write_frame_bank(0x24, fb)?; // current
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self.update_full()?;
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Ok(())
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}
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}
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@@ -1,14 +1,23 @@
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use std::time::Duration;
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mod epd;
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use embedded_graphics::mono_font::ascii::FONT_10X20;
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use embedded_graphics::mono_font::MonoTextStyle;
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use embedded_graphics::pixelcolor::BinaryColor;
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use embedded_graphics::prelude::*;
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use embedded_graphics::primitives::{Circle, PrimitiveStyle};
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use embedded_graphics::text::{Alignment, Text};
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use esp_idf_svc::hal::delay::FreeRtos;
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use esp_idf_svc::hal::gpio::PinDriver;
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use esp_idf_svc::hal::gpio::{AnyIOPin, PinDriver, Pull};
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use esp_idf_svc::hal::peripherals::Peripherals;
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use esp_idf_svc::hal::rmt::config::{TransmitConfig, TxChannelConfig};
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use esp_idf_svc::hal::rmt::encoder::CopyEncoder;
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use esp_idf_svc::hal::rmt::{PinState, Symbol, TxChannelDriver};
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use esp_idf_svc::hal::units::Hertz;
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use esp_idf_svc::hal::spi::config::{Config, DriverConfig};
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use esp_idf_svc::hal::spi::{Dma, SpiBusDriver, SpiDriver};
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use esp_idf_svc::hal::units::FromValueType;
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const WS2812_RESOLUTION: Hertz = Hertz(10_000_000);
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use epd::Epd;
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/// Injected by build.rs so serial output and the panel itself identify the
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/// exact build being diagnosed.
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const BUILD_TAG: &str = concat!("build ", env!("BUILD_TIME"), " @", env!("BUILD_GIT"));
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fn main() -> anyhow::Result<()> {
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// Required once before any esp-idf-svc call; some runtime patches
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@@ -17,61 +26,76 @@ fn main() -> anyhow::Result<()> {
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esp_idf_svc::log::EspLogger::initialize_default();
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let peripherals = Peripherals::take()?;
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let mut led = PinDriver::output(peripherals.pins.gpio2)?;
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let pins = peripherals.pins;
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// On-board addressable LED (WS2812) — GPIO 48 on the DevKitC-1 v1.0;
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// v1.1 boards moved it to GPIO 38.
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let mut rgb = TxChannelDriver::new(
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peripherals.pins.gpio48,
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&TxChannelConfig {
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resolution: WS2812_RESOLUTION,
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..Default::default()
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},
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// GDEY0579T93 wiring on S3-safe GPIOs (clear of flash 26–32, octal PSRAM
|
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// 33–37, strapping 0/3/45/46, USB 19/20, RGB LED 38/48). See
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// docs/v0.1-mvp-technical.md (Spike 2):
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// SCK 12 · DIN/MOSI 11 · CS 7 · DC 6 · RST 5 · BUSY 4
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let spi = SpiDriver::new(
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peripherals.spi2,
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pins.gpio12, // SCK
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pins.gpio11, // SDO / MOSI (DIN)
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None::<AnyIOPin>, // SDI / MISO — unused (write-only panel)
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&DriverConfig::new().dma(Dma::Auto(4096)),
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)?;
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// 4 MHz — GxEPD2's default for this controller. Verified clean on the
|
||||
// breadboard rig; a loose CS jumper (not clock speed) was behind the
|
||||
// early bring-up noise.
|
||||
let bus = SpiBusDriver::new(spi, &Config::new().baudrate(4.MHz().into()))?;
|
||||
|
||||
log::info!("Typoena Spike 1 — Blink on GPIO 2 + on-board WS2812 (GPIO 48)");
|
||||
let cs = PinDriver::output(pins.gpio7)?;
|
||||
let dc = PinDriver::output(pins.gpio6)?;
|
||||
let rst = PinDriver::output(pins.gpio5)?;
|
||||
let busy = PinDriver::input(pins.gpio4, Pull::Down)?;
|
||||
|
||||
let mut n: u32 = 0;
|
||||
let mut epd = Epd::new(bus, dc, rst, cs, busy);
|
||||
|
||||
log::info!("Typoena Spike 2b — GDEY0579T93 text test, {BUILD_TAG}");
|
||||
log::info!("hardware reset…");
|
||||
epd.reset()?;
|
||||
log::info!("init…");
|
||||
epd.init()?;
|
||||
epd.clear_screen(0xFF)?; // initial clean slate, per GxEPD2
|
||||
|
||||
// Alternate normal and inverted frames: circle on the master/slave seam
|
||||
// (proves the split-and-mirror blit), "Typoena" inside it, and the build
|
||||
// tag at the bottom so the panel identifies the running build.
|
||||
let frames = [make_frame(false), make_frame(true)];
|
||||
let mut i = 0;
|
||||
loop {
|
||||
led.set_high()?;
|
||||
ws2812_set(&mut rgb, 4, 0, 24)?;
|
||||
log::info!("blink {n}");
|
||||
n = n.wrapping_add(1);
|
||||
FreeRtos::delay_ms(500);
|
||||
|
||||
led.set_low()?;
|
||||
ws2812_set(&mut rgb, 0, 0, 0)?;
|
||||
FreeRtos::delay_ms(500);
|
||||
log::info!("frame → {}", if i == 0 { "black on WHITE" } else { "white on BLACK" });
|
||||
epd.display_frame(frames[i].bytes())?;
|
||||
log::info!("refresh done; holding 3 s");
|
||||
FreeRtos::delay_ms(3000);
|
||||
i = 1 - i;
|
||||
}
|
||||
}
|
||||
|
||||
/// Send one WS2812 GRB frame. The ≥50 µs low reset the LED needs between
|
||||
/// frames is covered by the 500 ms idle gap between calls.
|
||||
fn ws2812_set(tx: &mut TxChannelDriver, r: u8, g: u8, b: u8) -> anyhow::Result<()> {
|
||||
// Bit timings from the WS2812 datasheet.
|
||||
let zero = Symbol::new_with(
|
||||
WS2812_RESOLUTION,
|
||||
PinState::High,
|
||||
Duration::from_nanos(350),
|
||||
PinState::Low,
|
||||
Duration::from_nanos(800),
|
||||
)?;
|
||||
let one = Symbol::new_with(
|
||||
WS2812_RESOLUTION,
|
||||
PinState::High,
|
||||
Duration::from_nanos(700),
|
||||
PinState::Low,
|
||||
Duration::from_nanos(600),
|
||||
)?;
|
||||
|
||||
let mut symbols = [zero; 24];
|
||||
for (i, byte) in [g, r, b].into_iter().enumerate() {
|
||||
for bit in 0..8 {
|
||||
if byte & (0x80 >> bit) != 0 {
|
||||
symbols[i * 8 + bit] = one;
|
||||
}
|
||||
}
|
||||
}
|
||||
tx.send_and_wait(CopyEncoder::new()?, &symbols, &TransmitConfig::default())?;
|
||||
Ok(())
|
||||
/// Circle centered on the controller seam, "Typoena" inside, build tag at
|
||||
/// the bottom edge. `inverted` swaps ink and paper.
|
||||
fn make_frame(inverted: bool) -> epd::Frame {
|
||||
let (mut frame, ink) = if inverted {
|
||||
(epd::Frame::new_black(), BinaryColor::Off)
|
||||
} else {
|
||||
(epd::Frame::new_white(), BinaryColor::On)
|
||||
};
|
||||
let center = Point::new(epd::WIDTH as i32 / 2, epd::HEIGHT as i32 / 2);
|
||||
let style = MonoTextStyle::new(&FONT_10X20, ink);
|
||||
Circle::with_center(center, 200)
|
||||
.into_styled(PrimitiveStyle::with_stroke(ink, 6))
|
||||
.draw(&mut frame)
|
||||
.unwrap();
|
||||
Text::with_alignment("Typoena", center + Point::new(0, 7), style, Alignment::Center)
|
||||
.draw(&mut frame)
|
||||
.unwrap();
|
||||
Text::with_alignment(
|
||||
BUILD_TAG,
|
||||
Point::new(center.x, epd::HEIGHT as i32 - 10),
|
||||
style,
|
||||
Alignment::Center,
|
||||
)
|
||||
.draw(&mut frame)
|
||||
.unwrap();
|
||||
frame
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user