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USART_ClearITPendingBit(USART2,USART_IT_RXNE);
I put it in the interrupt processing function, why is there no effect?

answer:

The RXNE flag cannot be cleared directly. Read USART->DR (that is, read the received data) to clear the RXNE flag.

Keywords：stm32 USART Reference address：When is the stm32 USART interrupt flag cleared

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