feat: add support for Waveshare 3.52" EPD (EPD3IN52)#254
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cogwheel886 wants to merge 3 commits intorust-embedded-community:mainfrom
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feat: add support for Waveshare 3.52" EPD (EPD3IN52)#254cogwheel886 wants to merge 3 commits intorust-embedded-community:mainfrom
cogwheel886 wants to merge 3 commits intorust-embedded-community:mainfrom
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added 3 commits
April 11, 2026 01:53
- 240x360 resolution, UC8179 controller - Hardware-verified LUT waveform tables (GC and DU) - Alternating R22/R23 waveform tables in display_frame() - IS_BUSY_LOW: true, verified on Raspberry Pi 5 with lgpio - Includes Display3in52 type alias for graphics feature - 56 unit tests passing (54 original + 2 new)
- Fix clear_frame() sending 8x too many bytes (WIDTH*HEIGHT → buffer_len) - Fix refresh command: 0x12 → 0x17 + 0xA5 matching Python reference - Rename EPD3in52 → Epd3in52 (naming convention)
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Consolidating into #255 which now includes the UC8253 (3.52") driver alongside the SSD1680 (2.13" V4) driver. Both share interface.rs changes and have been through the same hardware-verified fix passes. Keeping them in separate PRs risks divergence — the 3.52" driver fixes in #255 are not present on this branch. |
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Waveshare 3.52" E-Paper Display (EPD3IN52)
Adds driver support for the Waveshare 3.52" e-paper display (360×240px, UC8179 controller).
Display characteristics
This display has an unusual refresh sequence not seen in other supported displays —
display_frame()must explicitly send LUT waveform tables before triggering refresh. Most Waveshare displays handle this internally; the 3.52" does not. Additionally, the waveform tables alternate between two configurations (R22/R23) on each refresh cycle via alut_flag: boolfield on the driver struct.Hardware verification
IS_BUSY_LOW: trueconfirmed empiricallyWhat's included
command.rs: 17 SPI commands for the UC8179 controllerconstants.rs: 10 LUT waveform tables (5× GC global clear, 5× DU differential update)mod.rs: Full driver implementation with alternating waveform logicDisplay3in52type alias under#[cfg(feature = "graphics")]epd_sizeandcommand_addrNot yet implemented
update_partial_frame()— markedtodo!(), hardware validation pendingconstants.rsbut not yet wired into a fast-refresh code pathReferences
Hardware validation ongoing — opening as draft pending display refresh test on target hardware.