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more on rmk.

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Gabe Venberg 2025-03-17 19:49:23 +01:00
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content/posts/rmk-ferris-sweep/index.md
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@ -47,4 +47,20 @@ My [keymap](https://github.com/gabevenberg/qmk_firmware/blob/personal/keyboards/
is a bit complex, so it took some time to port.
It was mostly tedium rather than anything truly headscratching, however.
Next, and the most complicated step, was creating a `vial.json`.
The json file [provided by the via project](https://github.com/the-via/keyboards/blob/master/src/ferris/sweep/sweep.json) was wrong,
as it layed out the keyboard as a 8x5, rather than a 4x10 that I had done in rmk.
So I had to take that file, load it into the [keyboard layout editor](https://www.keyboard-layout-editor.com/),
and follow [vials guide](https://get.vial.today/docs/porting-to-via.html) to remake the `vial.json` in the right layout.
Finally, I could flash my keyboard.
I flashed it, and... It didnt work.
The left hand side, the one plugged into USB, worked fine, all keys worked.
But the right hand side, connected to the main by TRRS, did nothing.
A day or 2 of investigation later revealed that the half-duplex serial implementation
only used the RP2040s internal pull-up resistors, which for my keyboard and TRRS cable,
were insufficient for a baud rate of 115200.
This was (temporarily) fixed by setting a lower baud rate,
but for the long term, ive made a PR mirroring [QMKs solution](https://github.com/qmk/qmk_firmware/blob/6d0e5728aa61b442885d48caf49d29e5c60e8197/platforms/chibios/drivers/vendor/RP/RP2040/serial_vendor.c#L133) to this problem.
The final file looked like [this](https://github.com/gabevenberg/ferris-sweep-rmk/blob/main/keyboard.toml)