STM32F107的IRDA不能工作

USART_InitStructure.USART_BaudRate = 9600;//115200;

  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;



  /* Configure the USARTy */

  USART_Init(USARTy, &USART_InitStructure);

  /* Enable the USARTy */

  USART_Cmd(USARTy, ENABLE);

  /* Set the USARTy prescaler */

  USART_SetPrescaler(USARTy, 0x1);

  /* Configure the USARTy IrDA mode */

  USART_IrDAConfig(USARTy, USART_IrDAMode_Normal);



  /* Enable the USARTy IrDA mode */

  USART_IrDACmd(USARTy, ENABLE);





  while (1)

  {

   USART_SendData(USARTy, i++);//i unsigned char

   delay(1000000);

  }

}

  USART_InitStructure.USART_BaudRate = 9600;//115200;

  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;

  

  /* Configure the USARTy */

  USART_Init(USARTy, &USART_InitStructure);





  STM_EVAL_COMInit(COM2, &USART_InitStructure);

  printf("\n\rUSART Printf Example: retarget the C library printf function to the USART\n\r");



  /* Enable the USARTy */

  USART_Cmd(USARTy, ENABLE);



  /* Set the USARTy prescaler */

  USART_SetPrescaler(USARTy, 0x1);

  /* Configure the USARTy IrDA mode */

  USART_IrDAConfig(USARTy, USART_IrDAMode_Normal);



  /* Enable the USARTy IrDA mode */

  USART_IrDACmd(USARTy, ENABLE);



  while (1)

  {

    /* Wait until a byte is received */

    while(USART_GetFlagStatus(USARTy, USART_FLAG_RXNE) == RESET)

    {

           count++;

           if(count > 1000000)

           {

           printf("\n\r 等待接收数据 \n\r");

           count = 0;

           }

    }

    /* Read the received byte */

     //ReceivedData = (JOYState_TypeDef)USART_ReceiveData(USARTy);

     REV = (unsigned char)USART_ReceiveData(USARTy);

         //USART_SendData(USARTy,i++);

         //REV = 255;

         printf("\n\r 接收到的数据为：%d%d%d \n\r",REV/100,REV%100/10,REV%10);

         Delay(5000000);

  }

}