STM32F030串口中断进入一次之后不再进入了，这是什么问题啊？

ahua · 发表于 2019-6-16 22:15:00

遇到一个很奇怪的问题，STM32F030和传感器通信使用modbus协议，我用串口1中断接收数据，MCU数据发送正常，接收方也有返回数据，但是串口中断进去一次中断之后就不再进去了，求助各位！！！下面是我的代码
void USART_Configuration(void)//串口初始化函数
{
      GPIO_InitTypeDef  GPIO_InitStructure;
      USART_InitTypeDef USART_InitStructure;

      NVIC_InitTypeDef NVIC_InitStructure;

      RCC_AHBPeriphClockCmd( RCC_AHBPeriph_GPIOA, ENABLE);
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE );

      GPIO_PinAFConfig(GPIOA,GPIO_PinSource9,GPIO_AF_1);
      GPIO_PinAFConfig(GPIOA,GPIO_PinSource10,GPIO_AF_1);
      /*
      *  USART1_TX -> PA9 , USART1_RX ->       PA10
      */
      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9|GPIO_Pin_10;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
      GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
      GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_Init(GPIOA, &GPIO_InitStructure);

      NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
      NVIC_InitStructure.NVIC_IRQChannelPriority = 1;
      NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
      NVIC_Init(&NVIC_InitStructure);

      USART_InitStructure.USART_BaudRate = 9600;//设置串口波特率
      USART_InitStructure.USART_WordLength = USART_WordLength_8b;//设置数据位
      USART_InitStructure.USART_StopBits = USART_StopBits_1;//设置停止位
      USART_InitStructure.USART_Parity = USART_Parity_No;//设置效验位
      USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//设置流控制
      USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;//设置工作模式
      USART_Init(USART1, &USART_InitStructure); //配置入结构体

      USART_ITConfig(USART1,USART_IT_RXNE,ENABLE);
      USART_Cmd(USART1, ENABLE);//使能串口1

}

void USART1_IRQHandler(void) //
{
uint8_t res = 0;

if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)
{
   if(g_ucUSART1RxTOCnt == 0)                                        //接收超时
   {
      g_ucUSART1RxIdx = 0;
   }
   g_ucUSART1RxTOCnt = 35;                                           //接收超时: 35ms, 实际介于34~35ms
   res = (uint8_t)(USART_ReceiveData(USART1));

      g_ucUSART1RxBuf[g_ucUSART1RxIdx] = res;
      if(g_ucUSART1RxIdx < (sizeof(g_ucUSART1RxBuf)-1))
      {
      g_ucUSART1RxIdx++;
      }
      USART_ClearITPendingBit(USART1,USART_IT_RXNE);
}
}

定时器中断是正常的。