STM32F407 串口2中断不行

只看该作者 · 2018-7-29 10:52

调试过程中突然需要在添加一个串口，所以就根据已经可以用的串口1，复制进行修改代码如下，加入串口2的初始化原本的FSMC总线直接不行，就把FSMC初始化改到在串口2之前初始化，FSMC正常，但现在串口2一点反应都没有，FSMC与串口2（PA2,PA3）会不会出现冲突问题，求知道的人指点，谢谢了！

/* Uart 2 Modbus */
static void Usart2Init(u32 Baudrate)
{
      GPIO_InitTypeDef  GPIO_InitStructure;
      USART_InitTypeDef USART_InitStructure;
      NVIC_InitTypeDef  NVIC_InitStructure;

      /* Clk */
      RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
      RCC_APB2PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);

      /* Gpio Cfg */
      GPIO_PinAFConfig(GPIOA, GPIO_PinSource2,  GPIO_AF_USART2);
      GPIO_PinAFConfig(GPIOA, GPIO_PinSource3,  GPIO_AF_USART2);


      GPIO_StructInit(&GPIO_InitStructure);    //缺省值填入
      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_3;
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
      GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
      GPIO_Init(GPIOA, &GPIO_InitStructure);

      /* Nvic Interrupt */
      NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
      NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
      NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
      NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
      NVIC_Init(&NVIC_InitStructure);

      /* Uart Cfg */

      USART_InitStructure.USART_BaudRate = Baudrate;//波特率设置
      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);

      /* Enable Uart */
      USART_Cmd(USART2, ENABLE);
      USART_ClearFlag(USART2, USART_FLAG_TC);

      /* Enable Uart Int */
      USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);

}

GLOBAL void Usart2Send(char send_data)
{
      while(USART_GetFlagStatus(USART2, USART_FLAG_TXE) == RESET);
USART_SendData(USART2,send_data);
}

void USART2_IRQHandler(void)
{                                                                                        //定义字符变量
      if(USART_GetITStatus(USART2, USART_IT_RXNE) != RESET)                //判断发生接收中断
            {
            USART_ClearITPendingBit(USART2, USART_IT_RXNE);                //清除中断标志
            MbsRtuRxdISR(1,USART_ReceiveData(USART2)&0xFF);             //modbus接收解析函数
            }
}

STM32F407 串口2中断不行

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