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Enable/disable the UART TX before changing the TX pin mode (#13017)

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Steve Evans 2023-08-08 06:49:51 +01:00 • committed by GitHub
parent 9bbe2836a4
commit a54bc47e1b
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1 changed files with 7 additions and 0 deletions
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7
src/main/drivers/stm32/serial_uart_hal.c
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@ -251,6 +251,10 @@ bool checkUsartTxOutput(uartPort_t *s)
// Enable USART TX output // Enable USART TX output
uart->txPinState = TX_PIN_ACTIVE; uart->txPinState = TX_PIN_ACTIVE;
IOConfigGPIOAF(txIO, IOCFG_AF_PP, uart->tx.af); IOConfigGPIOAF(txIO, IOCFG_AF_PP, uart->tx.af);
// Enable the UART transmitter
SET_BIT(s->Handle.Instance->CR1, USART_CR1_TE);
return true; return true;
} else { } else {
// TX line is pulled low so don't enable USART TX // TX line is pulled low so don't enable USART TX
@ -268,6 +272,9 @@ void uartTxMonitor(uartPort_t *s)
if (uart->txPinState == TX_PIN_ACTIVE) { if (uart->txPinState == TX_PIN_ACTIVE) {
IO_t txIO = IOGetByTag(uart->tx.pin); IO_t txIO = IOGetByTag(uart->tx.pin);
// Disable the UART transmitter
CLEAR_BIT(s->Handle.Instance->CR1, USART_CR1_TE);
// Switch TX to an input with pullup so it's state can be monitored // Switch TX to an input with pullup so it's state can be monitored
uart->txPinState = TX_PIN_MONITOR; uart->txPinState = TX_PIN_MONITOR;
IOConfigGPIO(txIO, IOCFG_IPU); IOConfigGPIO(txIO, IOCFG_IPU);