examples: add 2.13in e-Paper V1 demo for RP2040-PiZero - #890
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conejoninja merged 1 commit intoSep 10, 2026
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Exercise all four SetRotation modes in the demo. Fix epd2in13.Size(), which reported the padded logical buffer width instead of the true panel width at rotation 90 and 270. This clipped the last few rows on those rotations because the driver bounds check used the true width while Size() reported the padded width. Scale the dither ramp and solid block to the panel height instead of fixed pixel offsets, so they fit inside the shorter 122 pixel dimension at rotation 90 and 270.
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@conejoninja PTAL, i also verified rotation was working IMG_2519.MOV |
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Thanks for your contribution! Merged |
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Adds a hardware bring-up demo for the Waveshare 2.13in e-Paper HAT V1 driven by a Waveshare RP2040-PiZero.
What it does
The demo clears the panel, then draws a test pattern chosen so that a partial result localises the fault rather than just reporting failure:
It logs progress over USB serial and then enters deep sleep, since an e-paper panel holds its image without power.
Scope
The header comment is explicit about what this is verified against, because the driver is not interchangeable across panel revisions.
epd2in13sends the IL3820 init sequence and a 30 byte LUT. V2 and later use the SSD1680, which needs a different init sequence and a 153 byte LUT, so this demo will not drive them. The comment lists the panel revisions and boards as known working, untested, and not supported, and explains how to identify a panel from the ribbon cable date code.Verification
Flashed to real hardware with
tinygo flash -target=pico -monitor. The panel rendered the complete pattern, which confirms SPI1 clock and data, the CS, DC, RST and BUSY pins, the IL3820 init sequence, and the RAM write. Serial output was:gofmtis clean andtinygo build -target=picosucceeds.One caveat worth flagging for reviewers: only the RP2040-PiZero with a V1 panel is marked as tested. The suggestion in the comment to try
epd2in9v2for SSD1680 panels is a starting point rather than a verified path, since that package targets a 2.9in panel and would need Width and Height overrides. I did not have the hardware to confirm it.