mirror of
https://github.com/Keychron/qmk_firmware.git
synced 2024-11-25 09:56:54 +06:00
71 lines
3.0 KiB
Markdown
71 lines
3.0 KiB
Markdown
# 'serial' Driver
|
|
This driver powers the [Split Keyboard](feature_split_keyboard.md) feature.
|
|
|
|
?> Serial in this context should be read as **sending information one bit at a time**, rather than implementing UART/USART/RS485/RS232 standards.
|
|
|
|
All drivers in this category have the following characteristics:
|
|
* Provides data and signaling over a single conductor
|
|
* Limited to single master, single slave
|
|
|
|
## Supported Driver Types
|
|
|
|
| | AVR | ARM |
|
|
|-------------------|--------------------|--------------------|
|
|
| bit bang | :heavy_check_mark: | :heavy_check_mark: |
|
|
| USART Half-duplex | | :heavy_check_mark: |
|
|
|
|
## Driver configuration
|
|
|
|
### Bitbang
|
|
Default driver, the absence of configuration assumes this driver. To configure it, add this to your rules.mk:
|
|
|
|
```make
|
|
SERIAL_DRIVER = bitbang
|
|
```
|
|
|
|
Configure the driver via your config.h:
|
|
```c
|
|
#define SOFT_SERIAL_PIN D0 // or D1, D2, D3, E6
|
|
#define SELECT_SOFT_SERIAL_SPEED 1 // or 0, 2, 3, 4, 5
|
|
// 0: about 189kbps (Experimental only)
|
|
// 1: about 137kbps (default)
|
|
// 2: about 75kbps
|
|
// 3: about 39kbps
|
|
// 4: about 26kbps
|
|
// 5: about 20kbps
|
|
```
|
|
|
|
#### ARM
|
|
|
|
!> The bitbang driver causes connection issues with bitbang WS2812 driver
|
|
|
|
Along with the generic options above, you must also turn on the `PAL_USE_CALLBACKS` feature in your halconf.h.
|
|
|
|
### USART Half-duplex
|
|
Targeting STM32 boards where communication is offloaded to a USART hardware device. The advantage is that this provides fast and accurate timings. `SOFT_SERIAL_PIN` for this driver is the configured USART TX pin. **The TX pin must have appropriate pull-up resistors**. To configure it, add this to your rules.mk:
|
|
|
|
```make
|
|
SERIAL_DRIVER = usart
|
|
```
|
|
|
|
Configure the hardware via your config.h:
|
|
```c
|
|
#define SOFT_SERIAL_PIN B6 // USART TX pin
|
|
#define SELECT_SOFT_SERIAL_SPEED 1 // or 0, 2, 3, 4, 5
|
|
// 0: about 460800 baud
|
|
// 1: about 230400 baud (default)
|
|
// 2: about 115200 baud
|
|
// 3: about 57600 baud
|
|
// 4: about 38400 baud
|
|
// 5: about 19200 baud
|
|
#define SERIAL_USART_DRIVER SD1 // USART driver of TX pin. default: SD1
|
|
#define SERIAL_USART_TX_PAL_MODE 7 // Pin "alternate function", see the respective datasheet for the appropriate values for your MCU. default: 7
|
|
#define SERIAL_USART_TIMEOUT 100 // USART driver timeout. default 100
|
|
```
|
|
|
|
You must also enable the ChibiOS `SERIAL` feature:
|
|
* In your board's halconf.h: `#define HAL_USE_SERIAL TRUE`
|
|
* In your board's mcuconf.h: `#define STM32_SERIAL_USE_USARTn TRUE` (where 'n' matches the peripheral number of your selected USART on the MCU)
|
|
|
|
Do note that the configuration required is for the `SERIAL` peripheral, not the `UART` peripheral.
|