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Enable/disable the UART TX before changing the TX pin mode (#13018)

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Steve Evans 2023-08-07 23:50:12 +01:00 • committed by GitHub
parent 96ffb3aa3d
commit bd68d3d4a9
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1 changed files with 9 additions and 1 deletions
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10
src/main/drivers/serial_uart_hal.c
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@ -249,6 +249,10 @@ 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
@ -262,9 +266,13 @@ bool checkUsartTxOutput(uartPort_t *s)
void uartTxMonitor(uartPort_t *s) void uartTxMonitor(uartPort_t *s)
{ {
uartDevice_t *uart = container_of(s, uartDevice_t, port); uartDevice_t *uart = container_of(s, uartDevice_t, port);
IO_t txIO = IOGetByTag(uart->tx.pin);
if (uart->txPinState == TX_PIN_ACTIVE) { if (uart->txPinState == TX_PIN_ACTIVE) {
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);