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polhenarejos / pico-fido

Transforming a Raspberry Pico into a FIDO key
GNU General Public License v3.0
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Ability to change pins for LED and Button #15

Closed cortices closed 9 months ago

cortices commented 10 months ago

I'm trying to work out where the Hardware Abstraction Layer for choosing the button and LED pins lives, as I wish to break out both to external IO pins and use those elsewhere, and the Pi Pico board doesn't break out BOOTSEL or LED (GP25).

Which file or dependency are these defined in? I couldn't find it in this repo or the hsm_sdk one either.

polhenarejos commented 10 months ago

LED is in https://github.com/polhenarejos/pico-hsm-sdk/blob/main/src/main.c#L197 Button task is handled by TinyUSB, already embedded to Pico SDK.

Usually it takes the macros defined by PICO_BOARD when compiling, that defines PICO_DEFAULT_LED_PIN and others. If you want to use another board, you have to specify by PICO_BOARD. On the contrary, if you are using your own board, you should add the corresponding header file at Pico SDK (not the Pico HSM SDK) defining LED pins, capacity of flash memory and other parameters.

cortices commented 9 months ago

I added some #undefines to replace PICO_DEFAULT_LED_PIN and PICO_DEFAULT_LED_PIN_INVERTED, and replaced calls to board_button_read() with my own function. This was sufficient.