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drivers: uart stm32 flushing Rx register once the RXNE irq is enabled

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When the "Read data register not empty" irq occurs,
this commit is cleaning the RXNE flag by flushing the RX register
since the Receive Data Reg. (USART_RDR) has not be read previously
This could be the case when aborting a Rx for example.

Signed-off-by: Francois Ramu <francois.ramu@st.com>
This commit is contained in:
Francois Ramu 2021-10-26 11:39:57 +02:00 committed by Maureen Helm
parent 608b358d6b
commit 95e2c39497
1 changed files with 6 additions and 2 deletions
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8
drivers/serial/uart_stm32.c
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@ -888,7 +888,7 @@ static void uart_stm32_isr(const struct device *dev)
uart_stm32_dma_rx_flush(dev);
}
} else if (LL_USART_IsEnabledIT_TC(UartInstance) &&
LL_USART_IsActiveFlag_TC(UartInstance)) {
LL_USART_IsActiveFlag_TC(UartInstance)) {
LL_USART_DisableIT_TC(UartInstance);
LL_USART_ClearFlag_TC(UartInstance);
@ -898,6 +898,10 @@ static void uart_stm32_isr(const struct device *dev)
#ifdef CONFIG_PM
uart_stm32_pm_constraint_release(dev);
#endif
} else if (LL_USART_IsEnabledIT_RXNE(UartInstance) &&
LL_USART_IsActiveFlag_RXNE(UartInstance)) {
/* clear the RXNE by flushing the fifo, because Rx data was not read */
LL_USART_RequestRxDataFlush(UartInstance);
}
/* Clear errors */
@ -979,7 +983,7 @@ static int uart_stm32_async_rx_disable(const struct device *dev)
data->rx_next_buffer = NULL;
data->rx_next_buffer_len = 0;
/*when async rx is disabled, enable interruptable instance of uart to function normally*/
/* When async rx is disabled, enable interruptable instance of uart to function normally*/
LL_USART_EnableIT_RXNE(UartInstance);
LOG_DBG("rx: disabled");