STM32F030C8T6使用PA2 PA3做Usart2做串口接收不能进入中断

只看该作者 · 2023-9-27 11:00

使用的MDK-KEIL5 用的标准库.
相关代码
void Usart2_Init(void)
{
      GPIO_InitTypeDef GPIO_InitStructure;
      USART_InitTypeDef USART_InitStructure;
      NVIC_InitTypeDef NVIC_InitStructure;

      /* config USART1 clock */
      RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2 , ENABLE);
      RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
      /* Enable Syscfg */
// RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);

  /* USART1 Pins configuration ************************************************/
  /* Connect pin to Periph  设置为复用功能 */
  GPIO_PinAFConfig(GPIOA, GPIO_PinSource2, GPIO_AF_1);
  GPIO_PinAFConfig(GPIOA, GPIO_PinSource3, GPIO_AF_1);

  /* Configure pins as AF pushpull */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_3;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

            /* USART1 IRQ Channel configuration */
  NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPriority = 0x01;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);

      /* USART1 mode config */
  USART_InitStructure.USART_BaudRate = 9600;
  USART_InitStructure.USART_WordLength = USART_WordLength_8b;
  USART_InitStructure.USART_StopBits = USART_StopBits_1;
  USART_InitStructure.USART_Parity = USART_Parity_No;
  USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
  USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
      USART_Init(USART2,&USART_InitStructure);
      //USART_ClearFlag(USART1,USART_FLAG_RXNE);
      /* Enable USARTs Receive interrupts */
      USART_ITConfig(USART2,USART_IT_RXNE,ENABLE);
//       USART_ITConfig(USART1, USART_IT_ORE, ENABLE);  //溢出中断
      /* Enable the USARTs */
      USART_Cmd(USART2,ENABLE);
}

/* 中断程序  */
void USART2_IRQHandler(void){
if (USART_GetFlagStatus(USART2, USART_FLAG_ORE) != RESET)
{
      USART_ReceiveData(USART2);
      USART_ClearITPendingBit(USART2,USART_IT_ORE);
}

      //接收中断处理程序就做了RXNE和ORE的清除操作,。
  if(USART_GetITStatus(USART2, USART_IT_RXNE) != RESET)  //读_SR
//       if(USART_GetFlagStatus(USART1, USART_IT_RXNE) != RESET)  //不好用.
  {
            SilenceTime2 = 0;  //静默时间清0
/* Read one byte from the receive data register */
Rx2Buffer[Rx2Counter++] = USART_ReceiveData(USART2);  //读_DR
            USART_ClearITPendingBit(USART2,USART_IT_RXNE); //必须要清除
  }
}

硬件仿真时使用串口调试工具发送数据.,但是一直进不了中断程序. 不知道是哪里错了.请大神们帮忙看看.