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drivers: serial: stm32 usart driver clears the RXNE through flag

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For some stm32 soc devices, the USART (or UART) flag RXNE is cleared
by the LL_USART_ClearFlag_RXNE function which directly writes
the RXNE bit of the Status register. This is the case with the
stm32F1x, stm32F2x,stm32F4x, stm32L1x.
Some other are using the Rx Data Flushing function.

Signed-off-by: Francois Ramu <francois.ramu@st.com>
This commit is contained in:
Francois Ramu 2021-11-08 11:43:53 +01:00 • committed by Christopher Friedt
commit cf60639390
1 changed files with 5 additions and 0 deletions
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5
drivers/serial/uart_stm32.c
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@ -900,8 +900,13 @@ static void uart_stm32_isr(const struct device *dev)
#endif
} else if (LL_USART_IsEnabledIT_RXNE(UartInstance) &&
LL_USART_IsActiveFlag_RXNE(UartInstance)) {
#ifdef USART_SR_RXNE
/* clear the RXNE flag, because Rx data was not read */
LL_USART_ClearFlag_RXNE(UartInstance);
#else
/* clear the RXNE by flushing the fifo, because Rx data was not read */
LL_USART_RequestRxDataFlush(UartInstance);
#endif /* USART_SR_RXNE */
}
/* Clear errors */