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Gabe Venberg 2025-03-11 16:43:41 +01:00
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content/posts/rmk-ferris-sweep/index.md
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@ -39,9 +39,12 @@ cross referencing the schematic with the elite-pis [usage guide](https://docs.ke
One stumbling block is that the Ferris sweep ran out of pins to use full-duplex UART, and therefore only uses half-duplex. One stumbling block is that the Ferris sweep ran out of pins to use full-duplex UART, and therefore only uses half-duplex.
To solve this, RMK supports (only on the RP2040) a PIO driver for half duplex, gated behind a crate feature in `cargo.toml`. To solve this, RMK supports (only on the RP2040) a PIO driver for half duplex, gated behind a crate feature in `cargo.toml`.
With it, we can set our Tx and Rx pins to the same pin. With it, we can set our Tx and Rx pins to the same pin.
In order to do this, however, I had to set the `rmk` dependency to a direct link to the Github repo,
because as of the time of writing, the `rp2040_pio` feature had not made it into a release.
After the painstaking process of tracing all the pins and putting them in the matrix, we can define the keymap. After the painstaking process of tracing all the pins and putting them in the matrix, we can define the keymap.
My [keymap](https://github.com/gabevenberg/qmk_firmware/blob/personal/keyboards/ferris/keymaps/almost_default/keymap.json) My [keymap](https://github.com/gabevenberg/qmk_firmware/blob/personal/keyboards/ferris/keymaps/almost_default/keymap.json)
is a bit complex, so it took some time to port. is a bit complex, so it took some time to port.
It was mostly tedium rather than anything truly headscratching, however.
The final file looked like [this](https://github.com/gabevenberg/ferris-sweep-rmk/blob/main/keyboard.toml) The final file looked like [this](https://github.com/gabevenberg/ferris-sweep-rmk/blob/main/keyboard.toml)