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Diffstat (limited to 'docs/uart_driver.md')
| -rw-r--r-- | docs/uart_driver.md | 32 |
1 files changed, 16 insertions, 16 deletions
diff --git a/docs/uart_driver.md b/docs/uart_driver.md index 340b648189..a44f2c28d9 100644 --- a/docs/uart_driver.md +++ b/docs/uart_driver.md @@ -1,10 +1,10 @@ -# UART Driver +# UART Driver :id=uart-driver The UART drivers used in QMK have a set of common functions to allow portability between MCUs. Currently, this driver does not support enabling hardware flow control (the `RTS` and `CTS` pins) if available, but may do so in future. -## AVR Configuration +## AVR Configuration :id=avr-configuration No special setup is required - just connect the `RX` and `TX` pins of your UART device to the opposite pins on the MCU: @@ -16,7 +16,7 @@ No special setup is required - just connect the `RX` and `TX` pins of your UART |ATmega32A |`D1`|`D0`|*n/a*|*n/a*| |ATmega328/P |`D1`|`D0`|*n/a*|*n/a*| -## ChibiOS/ARM Configuration +## ChibiOS/ARM Configuration :id=arm-configuration You'll need to determine which pins can be used for UART -- as an example, STM32 parts generally have multiple UART peripherals, labeled USART1, USART2, USART3 etc. @@ -47,45 +47,45 @@ Configuration-wise, you'll need to set up the peripheral as per your MCU's datas |`#define SD1_RTS_PIN` |The pin to use for RTS |`A12` | |`#define SD1_RTS_PAL_MODE`|The alternate function mode for RTS |`7` | -## Functions +## API :id=api -### `void uart_init(uint32_t baud)` +### `void uart_init(uint32_t baud)` :id=api-uart-init Initialize the UART driver. This function must be called only once, before any of the below functions can be called. -#### Arguments +#### Arguments :id=api-uart-init-arguments - `uint32_t baud` The baud rate to transmit and receive at. This may depend on the device you are communicating with. Common values are 1200, 2400, 4800, 9600, 19200, 38400, 57600, and 115200. --- -### `void uart_write(uint8_t data)` +### `void uart_write(uint8_t data)` :id=api-uart-write Transmit a single byte. -#### Arguments +#### Arguments :id=api-uart-write-arguments - `uint8_t data` The byte to write. --- -### `uint8_t uart_read(void)` +### `uint8_t uart_read(void)` :id=api-uart-read Receive a single byte. -#### Return Value +#### Return Value :id=api-uart-read-return The byte read from the receive buffer. This function will block if the buffer is empty (ie. no data to read). --- -### `void uart_transmit(const uint8_t *data, uint16_t length)` +### `void uart_transmit(const uint8_t *data, uint16_t length)` :id=api-uart-transmit Transmit multiple bytes. -#### Arguments +#### Arguments :id=api-uart-transmit-arguments - `const uint8_t *data` A pointer to the data to write from. @@ -94,11 +94,11 @@ Transmit multiple bytes. --- -### `void uart_receive(char *data, uint16_t length)` +### `void uart_receive(char *data, uint16_t length)` :id=api-uart-receive Receive multiple bytes. -#### Arguments +#### Arguments :id=api-uart-receive-arguments - `uint8_t *data` A pointer to the buffer to read into. @@ -107,10 +107,10 @@ Receive multiple bytes. --- -### `bool uart_available(void)` +### `bool uart_available(void)` :id=api-uart-available Return whether the receive buffer contains data. Call this function to determine if `uart_read()` will return data immediately. -#### Return Value +#### Return Value :id=api-uart-available-return `true` if the receive buffer length is non-zero. |