str912串口发送中断，怎么一直在中断中死循环了。

只看该作者 · 2010-5-25 15:32

配置UART
void uart_Confi(u32 Baudrate,UART_TypeDef* UARTx)
{
UART_InitTypeDef UART_InitStructure;


   if(UARTx==UART0){
      SCU_APBPeriphClockConfig(__UART0, ENABLE);    /* Enable UART0 Clock */
   }
else if(UARTx==UART1){
      SCU_APBPeriphClockConfig(__UART1, ENABLE);    /* Enable UART0 Clock */
}
else if(UARTx==UART2){
      SCU_APBPeriphClockConfig(__UART2, ENABLE);    /* Enable UART0 Clock */
}

  /* UARTx configuration -------------------------------------------------------*/
/* UARTx configured as follow:
      - Word Length = 8 Bits       //数据宽度 8bit
      - One Stop Bit          //停止位 1bit
      - No parity          //无奇偶校验
      - BaudRate = 9600 baud       //波特率 9600
      - Hardware flow control enabled (RTS and CTS signals)  //硬件流控制开启
      - Receive and transmit enabled       //开发送和接收
      - Receive and transmit FIFOs are enabled    //收发FIFO开启
      - Transmit and Receive FIFOs levels have 8 bytes depth  //收发FIFO各8个字节
*/
UART_InitStructure.UART_WordLength = UART_WordLength_8D;
UART_InitStructure.UART_StopBits = UART_StopBits_1;
UART_InitStructure.UART_Parity = UART_Parity_No ;
UART_InitStructure.UART_BaudRate = Baudrate;
UART_InitStructure.UART_HardwareFlowControl = UART_HardwareFlowControl_None;
//UART_InitStructure.UART_HardwareFlowControl = UART_HardwareFlowControl_RTS_CTS;
UART_InitStructure.UART_Mode = UART_Mode_Tx_Rx;
UART_InitStructure.UART_FIFO = UART_FIFO_Disable; //UART_FIFO_Enable;
//UART_InitStructure.UART_TxFIFOLevel = UART_FIFOLevel_1_2; /* FIFO size 16 bytes, FIFO level 8 bytes */
//UART_InitStructure.UART_RxFIFOLevel = UART_FIFOLevel_1_2; /* FIFO size 16 bytes, FIFO level 8 bytes */

UART_DeInit(UARTx);
UART_Init(UARTx, &UART_InitStructure);

   UART_ITConfig(UARTx, UART_IT_Receive | UART_IT_Transmit, ENABLE); /*enable UART Rx Interrupt*/  // | UART_IT_Transmit
SCU_AHBPeriphClockConfig(__VIC,ENABLE);       //使能VIC时钟
SCU_AHBPeriphReset(__VIC,DISABLE);

if(UARTx==UART0){
   VIC_Config(UART0_ITLine, VIC_IRQ, 5);
      VIC_ITCmd(UART0_ITLine,ENABLE);    /*enable UART0 interrupt for data reception*/
      UART_Cmd(UART0, ENABLE); /* Enable the UART0 */
}
else if(UARTx==UART1){
   VIC_Config(UART1_ITLine, VIC_IRQ, 5);
      VIC_ITCmd(UART1_ITLine,ENABLE);    /*enable UART0 interrupt for data reception*/
}
else if(UARTx==UART2){
   VIC_Config(UART2_ITLine, VIC_IRQ, 5);
      VIC_ITCmd(UART2_ITLine,ENABLE);    /*enable UART0 interrupt for data reception*/
}
}

UART0中断的处理
void UART0_IRQHandler(void)
{
  //RX
  if ((UART_GetITStatus(UART0, UART_IT_Receive)) == SET)
  {
UART_ClearITPendingBit(UART0, UART_IT_Receive);
UART0_RX_ISR();
  }
  //TX
  if ((UART_GetITStatus(UART0, UART_IT_Transmit)) == SET)
  {
UART_ClearITPendingBit(UART0, UART_IT_Transmit);
UART0_TX_ISR();
  }
}

void UART0_TX_ISR(void)
{
u8 Data;
if(FifoPop(&Uart0TxFifo,&Data))
{
  UART0->DR = Data;
}
}

串口发送
u32 UartWrite(u8 Uart, u8* pBuffer, u32 BufferSize)
{
u32 Count = 0;
u8 Data;
UartFifo_t* pUartFifo;
UART_TypeDef * pUart;
switch(Uart)
{
case 0:
   pUart = UART0;
   pUartFifo = &Uart0TxFifo;
   break;
case 1:
   pUart = UART1;
   pUartFifo = &Uart1TxFifo;
   break;
case 2:
   pUart = UART2;
   pUartFifo = &Uart2TxFifo;
   break;
default:
   return(0);
}
if(!FifoPop(pUartFifo,&Data))
{
FifoPush(pUartFifo,*(pBuffer+Count));
FifoPop(pUartFifo,&Data);
Count++;
//UART_SendData(pUart,Data);
pUart->DR = Data;
}
if(BufferSize != 0)
{
   for ( ; Count < BufferSize; ++Count)
   {
      if(!FifoPush(pUartFifo,*(pBuffer+Count)))
      {
      break;
      }
   }
}
return(Count);
}

出现的问题是执行完 UART_SendData(pUart,Data)或者pUart->DR = Data后，就不能执行下一步了，检测UART0->MIS，发现一直是UART_IT_Transmit，也就是它一直在死循环。