STM32 串口中断方式例程 /*---------------------------------------------------------------------------- USART1_IRQHandler Handles USART1 global interrupt request. *----------------------------------------------------------------------------*/ void USART1_IRQHandler (void) { volatile unsigned int IIR; struct buf_st *p; IIR = USART1->SR; if (IIR & USART_FLAG_RXNE) { // read interrupt USART1->SR &= ~USART_FLAG_RXNE; // clear interrupt p = &rbuf; if (((p->in - p->out) & ~(RBUF_SIZE-1)) == 0) { p->buf [p->in & (RBUF_SIZE-1)] = (USART1->DR & 0x1FF); p->in++; } } if (IIR & USART_FLAG_TXE) { USART1->SR &= ~USART_FLAG_TXE; // clear interrupt p = &tbuf; if (p->in != p->out) { USART1->DR = (p->buf [p->out & (TBUF_SIZE-1)] & 0x1FF); p->out++; tx_restart = 0; } else { tx_restart = 1; USART1->CR1 &= ~USART_FLAG_TXE; // disable TX interrupt if nothing to send } } }

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