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drivers: serial: stm32: remove forced RXNE clearance

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Removed RXNE clearance. RXNE is cleared upon reading DR|RDR register.

Signed-off-by: Georgij Cernysiov <g.cernysiov@elco-automation.de>
This commit is contained in:
Georgij Cernysiov 2019-02-06 23:31:24 +01:00 • committed by Kumar Gala
commit 3de55daab1
1 changed files with 3 additions and 7 deletions
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10
drivers/serial/uart_stm32.c
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@ -416,7 +416,7 @@ static int uart_stm32_fifo_fill(struct device *dev, const u8_t *tx_data,
while ((size - num_tx > 0) &&
LL_USART_IsActiveFlag_TXE(UartInstance)) {
/* TXE flag will be cleared with byte write to DR register */
/* TXE flag will be cleared with byte write to DR|RDR register */
/* Send a character (8bit , parity none) */
LL_USART_TransmitData8(UartInstance, tx_data[num_tx++]);
@ -433,11 +433,7 @@ static int uart_stm32_fifo_read(struct device *dev, u8_t *rx_data,
while ((size - num_rx > 0) &&
LL_USART_IsActiveFlag_RXNE(UartInstance)) {
#if defined(CONFIG_SOC_SERIES_STM32F1X) || defined(CONFIG_SOC_SERIES_STM32F4X) \
|| defined(CONFIG_SOC_SERIES_STM32F2X)
/* Clear the interrupt */
LL_USART_ClearFlag_RXNE(UartInstance);
#endif
/* RXNE flag will be cleared upon read from DR|RDR register */
/* Receive a character (8bit , parity none) */
rx_data[num_rx++] = LL_USART_ReceiveData8(UartInstance);
@ -446,8 +442,8 @@ static int uart_stm32_fifo_read(struct device *dev, u8_t *rx_data,
if (LL_USART_IsActiveFlag_ORE(UartInstance)) {
LL_USART_ClearFlag_ORE(UartInstance);
}
}
return num_rx;
}