TonBERRY/micropython
3
0
Fork 0
Code Pull Requests Activity

stm32/uart: Add uart_set_baudrate function.

Browse Source 
This allows changing the baudrate of the UART without reinitialising it
(reinitialising can lead to spurious characters sent on the TX line).

Signed-off-by: Damien George <damien@micropython.org>
This commit is contained in:
Damien George
2021-02-03 16:18:35 +11:00
parent 7ed99544e4
commit d2a34c62e7
9 changed files with 23 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

18
ports/stm32/uart.c
View File

@@ -603,7 +603,7 @@ void uart_attach_to_repl(pyb_uart_obj_t *self, bool attached) {
self->attached_to_repl = attached;
}
uint32_t uart_get_baudrate(pyb_uart_obj_t *self) {
uint32_t uart_get_source_freq(pyb_uart_obj_t *self) {
uint32_t uart_clk = 0;
#if defined(STM32F0)
@@ -672,10 +672,20 @@ uint32_t uart_get_baudrate(pyb_uart_obj_t *self) {
}
#endif
// This formula assumes UART_OVERSAMPLING_16
uint32_t baudrate = uart_clk / self->uartx->BRR;
return uart_clk;
}
return baudrate;
uint32_t uart_get_baudrate(pyb_uart_obj_t *self) {
// This formula assumes UART_OVERSAMPLING_16
return uart_get_source_freq(self) / self->uartx->BRR;
}
void uart_set_baudrate(pyb_uart_obj_t *self, uint32_t baudrate) {
LL_USART_SetBaudRate(self->uartx, uart_get_source_freq(self),
#if defined(STM32H7) || defined(STM32WB)
LL_USART_PRESCALER_DIV1,
#endif
LL_USART_OVERSAMPLING_16, baudrate);
}
mp_uint_t uart_rx_any(pyb_uart_obj_t *self) {