STM32中在main函数中调用延时函数导致程序死掉！！

只看该作者 · 2013-12-26 14:41

我在main函数中调用延时函数
SysTick_Delay(400);
LED_ON(LED1);
SysTick_Delay(500);
LED_OFF(LED1);

只有调用延时函数的时候就会这样。
如果程序中开了串口，我使用的是USART3，程序总是在串口中断，出不了了，请问该如何解决。

void USART3_IRQHandler(void)
{

      uint8_t RxBuf;

      if(USART_GetITStatus(USART3,USART_IT_RXNE)!=RESET)
      {
                              RxBuf = USART_ReceiveData(USART3);


                              RS485_RX_BUF[RS485_RX_GL] = RxBuf;

                              RS485_RX_GL++;

                              if((RS485_RX_BUF[0]!=RS485STARTCODE)||(RS485_RX_GL>=8))
                              {
                                             RS485_RX_GL = 0;
                                             RS485_RX_STA = 0;
                              }


                              if(RS485_RX_BUF[7]==RS485ENDCODE)
                              {

                                                      RS485_RX_GL=0;
                                                      RS485_RX_STA=1;
                                                      printf(" RS485 Receive Data ok!\n\r");

                              }

                              //-----------------------------------------------



                     USART_ClearITPendingBit(USART3,USART_IT_RXNE);
      }

            if(USART_GetFlagStatus(USART3,USART_FLAG_ORE) == SET)
            {

                     USART_ClearFlag(USART3,USART_FLAG_ORE);
            }

}

void RS485_TX_EN2(void)
{

            GPIO_SetBits(RS485_EN2_PORT,RS485_EN2_PIN);
}

void RS485_Init(void)
{
      /*-------------¶¨Òå½á¹¹Ìå±äÁ¿----------*/
      USART_InitTypeDef       USART_InitStructure;
      GPIO_InitTypeDef       GPIO_InitStructure;
      NVIC_InitTypeDef NVIC_InitStructure;

      /*--------------Ê¹ÄÜÏàÓ¦ÍâÉèµÄÊ±ÖÓ------*/
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB|RCC_APB2Periph_GPIOE|RCC_APB2Periph_AFIO,ENABLE);
      RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3,ENABLE);


      GPIO_InitStructure.GPIO_Pin =  RS485_EN2_PIN;
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
      GPIO_Init(RS485_EN2_PORT, &GPIO_InitStructure);

      USART_DeInit(USART3);

      /*-------------ÅäÖÃUSART3_TX(PB.10)----------*/
      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
      GPIO_Init(GPIOB,&GPIO_InitStructure);

      /*-------------ÅäÖÃUSART3_RX(PB.11)----------*/
      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
      GPIO_Init(GPIOB,&GPIO_InitStructure);

      RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART3,ENABLE);
      RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART3,DISABLE);

      RS485_RX_EN2();             //ÉèÖÃÎª½ÓÊÕÄ£Ê½

      /*------------USARTdµÄ¸÷¸ö²ÎÊýÅäÖÃ----------*/
      USART_InitStructure.USART_BaudRate = 9600;             //ÉèÖÃUSART´«ÊäµÄ²¨ÌØÂÊ
      USART_InitStructure.USART_WordLength = USART_WordLength_8b;       //8Î»Êý¾ÝÎ»
      USART_InitStructure.USART_StopBits = USART_StopBits_1;       //ÔÚÒ»Ö¡Êý¾Ý´«ÊäÍêÔÙ´«Ò»Î»Í£Ö¹Î»
      USART_InitStructure.USART_Parity = USART_Parity_No;       //ÎÞÆæÅ¼Ð£Ñé
      USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;       //Ó²¼þÁ÷¿ØÖÆÊ§ÄÜ£¨ÎÞÓ²¼þÁ÷¿ØÖÆ£©
      USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;//½ÓÊÜ·¢ËÍÊ¹ÄÜ
      USART_Init(USART3,&USART_InitStructure);             //³õÊ¼»¯USART3µÄ¼Ä´æÆ÷



      NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);

  /* Enable the USART1 Interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
// USART_ClearITPendingBit(USART3, USART_IT_TC);



      USART_ITConfig(USART3,USART_IT_RXNE,ENABLE);
      USART_Cmd(USART3,ENABLE);


}

只看该作者 · 2013-12-26 15:07

本帖最后由 jjjkkk00 于 2013-12-26 15:10 编辑

先检查一下这几个问题：
1.你的SysTick_Delay()是如何实现延时的？是用普通函数，还是中断函数SysTick_Handler()？
2.有用到中断函数SysTick_Handler()的情况，中断函数中做了些什么？
3.注意：SysTick_Handler()的优先级是不可修改、且等于-1。

排除了SysTick_Handler()打断串口中断的因素后，
然后，在看串口中断的状态位，查找原因。