drashna/qmk_firmware
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fauxpark 2021-02-08 07:57:09 +11:00
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42
docs/spi_driver.md
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@ -8,7 +8,7 @@ No special setup is required - just connect the `SS`, `SCK`, `MOSI` and `MISO` p
|MCU |`SS`|`SCK`|`MOSI`|`MISO`|
|-----------------|----|-----|------|------|
|ATMega16/32U2/4 |`B0`|`B1` |`B2` |`B3` |
|ATmega16/32U2/4 |`B0`|`B1` |`B2` |`B3` |
|AT90USB64/128/162|`B0`|`B1` |`B2` |`B3` |
|ATmega32A |`B4`|`B7` |`B5` |`B6` |
|ATmega328/P |`B2`|`B5` |`B3` |`B4` |
@ -20,22 +20,34 @@ You may use more than one slave select pin, not just the `SS` pin. This is usefu
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`.
To enable SPI, modify your board's `halconf.h` to enable SPI:
As per the AVR configuration, you may select any other standard GPIO as a slave select pin, and can be supplied to `spi_start()`.
```c
#define HAL_USE_SPI TRUE
#define SPI_USE_WAIT TRUE
#define SPI_SELECT_MODE SPI_SELECT_MODE_PAD
```
Then, modify your board's `mcuconf.h` to enable the peripheral you've chosen, for example:
```c
#undef STM32_SPI_USE_SPI2
#define STM32_SPI_USE_SPI2 TRUE
```
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`
|`config.h` Override|Description |Default|
|-------------------|-------------------------------------------------------------|-------|
|`SPI_DRIVER` |SPI peripheral to use - SPI1 -> `SPID1`, SPI2 -> `SPID2` etc.|`SPID2`|
|`SPI_SCK_PIN` |The pin to use for SCK |`B13` |
|`SPI_SCK_PAL_MODE` |The alternate function mode for SCK |`5` |
|`SPI_MOSI_PIN` |The pin to use for MOSI |`B15` |
|`SPI_MOSI_PAL_MODE`|The alternate function mode for MOSI |`5` |
|`SPI_MISO_PIN` |The pin to use for MISO |`B14` |
|`SPI_MISO_PAL_MODE`|The alternate function mode for MISO |`5` |
As per the AVR configuration, you may choose any other standard GPIO as a slave select pin, which should be supplied to `spi_start()`.
## Functions
@ -112,7 +124,7 @@ Send multiple bytes to the selected SPI device.
#### Return Value
`SPI_STATUS_TIMEOUT` if the timeout period elapses, `SPI_STATUS_SUCCESS` on success, or `SPI_STATUS_ERROR` otherwise.
`SPI_STATUS_TIMEOUT` if the timeout period elapses, `SPI_STATUS_ERROR` if some other error occurs, otherwise `SPI_STATUS_SUCCESS`.
---
@ -129,7 +141,7 @@ Receive multiple bytes from the selected SPI device.
#### Return Value
`SPI_STATUS_TIMEOUT` if the internal transmission timeout period elapses, `SPI_STATUS_SUCCESS` on success, or `SPI_STATUS_ERROR` otherwise.
`SPI_STATUS_TIMEOUT` if the timeout period elapses, `SPI_STATUS_ERROR` if some other error occurs, otherwise `SPI_STATUS_SUCCESS`.
---