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Chibios SPI driver: allow some SPI pins to be left unassigned (#20315)

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Co-authored-by: Sergey Vlasov <sigprof@gmail.com>
Co-authored-by: Nick Brassel <nick@tzarc.org>
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Purdea Andrei 2023-09-25 05:54:22 +03:00 • committed by GitHub
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docs/spi_driver.md
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@ -49,6 +49,11 @@ Configuration-wise, you'll need to set up the peripheral as per your MCU's datas
As per the AVR configuration, you may choose any other standard GPIO as a slave select pin, which should be supplied to `spi_start()`.
If a complete SPI interface is not required, then the following can be done to disable certain SPI pins, so they don't occupy a GPIO unnecessarily:
- in `config.h`: `#define SPI_MISO_PIN NO_PIN`
- in `config.h`: `#define SPI_MOSI_PIN NO_PIN`
- in `mcuconf.h`: `#define SPI_SELECT_MODE SPI_SELECT_MODE_NONE`, in this case the `slavePin` argument passed to `spi_start()` may be `NO_PIN` if the slave select pin is not used.
## API :id=api
### `void spi_init(void)` :id=api-spi-init