STM32F407串口发送中断与接收中断的问题

cjlong · 发表于 2016-2-29 10:33:35

本帖最后由 cjlong 于 2016-2-29 10:36 编辑

在做一个与电机驱动器通讯的项目的时候需要用到串口再通过485发送数据和接收数据
遇到的问题是，用串口循环发送数据的时候，可以用串口接收中断接收到数据，但是用串口发送中断发送数据的时候，串口就不能接收到数据，TC中断和TXE中断都试过了，都不能行
调试了好几天都找不到问题在哪儿，大家帮忙看看，到底是哪里有什么问题，谢谢大家！

串口配置代码如下：


void RS485_Init(u32 bound)
{

   GPIO_InitTypeDef GPIO_InitStructure;
      USART_InitTypeDef USART_InitStructure;
      NVIC_InitTypeDef NVIC_InitStructure;

      RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE);
      RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2,ENABLE);

  //′®¿ú2òy½Å¸′óÃó3éä
      GPIO_PinAFConfig(GPIOA,GPIO_PinSource2,GPIO_AF_USART2); //GPIOA2
      GPIO_PinAFConfig(GPIOA,GPIO_PinSource3,GPIO_AF_USART2); //GPIOA3

      //USART2
      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_3; //
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;//
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
      GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
      GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
      GPIO_Init(GPIOA,&GPIO_InitStructure); //

      //PG8íÆíìêä3ö￡¬485Ä￡ê½¿ØÖÆ
   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8; //GPIOG8
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
      GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
      GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
      GPIO_Init(GPIOG,&GPIO_InitStructure); //


//USART2
      USART_InitStructure.USART_BaudRate = bound;
      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_Cmd(USART2, ENABLE);  //ê1Äü′®¿ú 2

      USART_ITConfig(USART2, USART_IT_TC, ENABLE);

#if EN_USART2_RX
      USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);

      //Usart2 NVIC ÅäÖÃ
  NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
      NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0;
      NVIC_InitStructure.NVIC_IRQChannelSubPriority =2;
      NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
      NVIC_Init(&NVIC_InitStructure);

#endif

      RS485_TX_EN=0;
}

数据发送函数：//分割线上面注释的使用循环发送的方式，下部试图用中断发送的方式
void RS485_Send_Data(u8 *buf,u8 len)
{
//       u8 t;
//       RS485_TX_EN=1;
//       for(t=0;t<len;t++)
//       {
//       while(USART_GetFlagStatus(USART2,USART_FLAG_TC)==RESET);
// USART_SendData(USART2,buf[t]); //
//       }
//       while(USART_GetFlagStatus(USART2,USART_FLAG_TC)==RESET);
//
//       TIM7_ENABLE();
//       receCount = 0;
//       RS485_TX_EN=0;

/*******************************************************/
      RS485_TX_EN=1;
      sendPos = 0;
      USART_SendData(USART2,sendBuf[sendPos++]);

}

串口中断函数：
void USART2_IRQHandler(void)
{
      u8 res;
      if(USART_GetITStatus(USART2, USART_IT_RXNE) != RESET)
      {

            USART_ClearFlag(USART2, USART_FLAG_RXNE);
            if(USART_GetFlagStatus(USART2,USART_FLAG_PE)==RESET)
            {
                     receBuf[receCount]= USART_ReceiveData(USART2);
         receCount++;
            }
      }

  if(USART_GetITStatus(USART2, USART_IT_TC) != RESET)
      {
            if(firstTime == 1)
            {
                              USART_ClearFlag(USART2, USART_FLAG_TC);
                              firstTime = 0;
                              printf("first time of TC\r\n");

            }
            else if(sendPos < sendCount)
                              {
                                             USART_SendData(USART2,sendBuf[sendPos++]);
                                             printf("send %dth data\r\n",sendPos);
                              }
                              else
                              {
                                             USART_ClearFlag(USART2, USART_FLAG_TC);
                                             TIM7_ENABLE();
                                             receCount = 0;
                                             RS485_TX_EN=0;
                              }

      }
}