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[stm32][drv_usart]修复串口中断接收丢数据问题 

使用串口中断方式接收数据，读取数据时会自动清除标识，这里再次清除中断标识会导致下一个数据丢失。
使用finsh就可以测出这个问题，中断接收丢数据时无法查看历史命令。
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HubretXie 2019-01-12 15:03:37 +08:00 committed by GitHub
parent 2f8f8f85e2
commit 706c0410cd
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bsp/stm32/libraries/HAL_Drivers/drv_usart.c
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@ -235,8 +235,6 @@ static void uart_isr(struct rt_serial_device *serial)
(__HAL_UART_GET_IT_SOURCE(&(uart->handle), UART_IT_RXNE) != RESET)) (__HAL_UART_GET_IT_SOURCE(&(uart->handle), UART_IT_RXNE) != RESET))
{ {
rt_hw_serial_isr(serial, RT_SERIAL_EVENT_RX_IND); rt_hw_serial_isr(serial, RT_SERIAL_EVENT_RX_IND);
/* Clear RXNE interrupt flag */
UART_INSTANCE_CLEAR_FUNCTION(&(uart->handle), UART_FLAG_RXNE);
} }
#ifdef RT_SERIAL_USING_DMA #ifdef RT_SERIAL_USING_DMA
else if ((uart->uart_dma_flag) && (__HAL_UART_GET_FLAG(&(uart->handle), UART_FLAG_IDLE) != RESET) && else if ((uart->uart_dma_flag) && (__HAL_UART_GET_FLAG(&(uart->handle), UART_FLAG_IDLE) != RESET) &&