使用STM32的USART3通讯老死机

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leewen|

楼主 | 2009-2-28 19:27 | 只看该作者回帖奖励

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STM32, 通讯, usart3, ni, structure

在用USART3通讯时，不断发送数据时就死机了。当停止IAR编译器，出现"CPU not halted",哪位高手遇到这种情况，可能哪些原因引起的，
初始化：
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_InitStructure.USART_Clock = USART_Clock_Disable;
  USART_InitStructure.USART_CPOL = USART_CPOL_Low;
  USART_InitStructure.USART_CPHA = USART_CPHA_2Edge;
  USART_InitStructure.USART_LastBit = USART_LastBit_Disable;

  USART_Init(USART3, &USART_InitStructure);

USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);
USART_ITConfig(USART3, USART_IT_TXE, ENABLE);
  USART_Cmd(USART1, ENABLE);

中断函数：
void USART3_IRQHandler(void)
{
BYTE bTmp;

  if(USART_GetITStatus(USART3, USART_IT_RXNE) != RESET)
  {
    /* Clear the USART3 Receive interrupt */
     USART_ClearITPendingBit(USART3, USART_IT_RXNE);

    bTmp = (USART_ReceiveData(USART3) & 0x7F);;

       }

  if(USART_GetITStatus(USART3, USART_IT_TXE) != RESET)
  {
    /* Clear the USART3 transmit interrupt */
    USART_ClearITPendingBit(USART3, USART_IT_TXE);

    if(fgUartTxBufOut(&bTmp) == TRUE )
    {
          USART_SendData(USART3, bTmp);
    }
    else
    {
         USART_ITConfig(USART3, USART_IT_TXE, DISABLE);
    }
  }
}
刚开始通讯都正常，一直有数据通讯时，一会儿就死机了。

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