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Add SPI master for ChibiOS/ARM. (#8779)

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Nick Brassel 2020-04-29 14:01:20 +10:00 • committed by GitHub
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docs/spi_driver.md
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@ -18,7 +18,24 @@ You may use more than one slave select pin, not just the `SS` pin. This is usefu
## ChibiOS/ARM Configuration
ARM support for this driver is not ready yet. Check back later!
You'll need to determine which pins can be used for SPI -- as an example, STM32 parts generally have multiple SPI peripherals, labeled SPI1, SPI2, SPI3 etc.
To enable SPI, modify your board's `halconf.h` to enable SPI - both `HAL_USE_SPI` and `SPI_USE_WAIT` should be `TRUE`, and `SPI_SELECT_MODE` should be `SPI_SELECT_MODE_PAD`.
Then, modify your board's `mcuconf.h` to enable the SPI peripheral you've chosen -- in the case of using SPI2, modify `STM32_SPI_USE_SPI2` to be `TRUE`.
As per the AVR configuration, you may select any other standard GPIO as a slave select pin, and can be supplied to `spi_start()`.
Configuration-wise, you'll need to set up the peripheral as per your MCU's datasheet -- the defaults match the pins for a Proton-C, i.e. STM32F303.
`config.h` override | Description | Default Value
----------------------------|---------------------------------------------------------------|--------------
`#define SPI_DRIVER` | SPI peripheral to use - SPI1 => `SPID1`, SPI2 => `SPID2` etc. | `SPID2`
`#define SPI_SCK_PIN` | The pin to use for the SCK | `B13`
`#define SPI_SCK_PAL_MODE` | The alternate function mode for the SCK pin | `5`
`#define SPI_MOSI_PIN` | The pin to use for the MOSI | `B15`
`#define SPI_MOSI_PAL_MODE` | The alternate function mode for the MOSI pin | `5`
`#define SPI_MISO_PIN` | The pin to use for the MISO | `B14`
`#define SPI_MISO_PAL_MODE` | The alternate function mode for the MISO pin | `5`
## Functions