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stm32103 的uart5发送数据会死循环在轮询

时间:10-02 整理:3721RD 点击:
stm32103 的uart5   不知道为什么会死在while (USART_GetFlagStatus(UART5,USART_FLAG_TC) ==RESET);//轮询直到发送数据完毕
在这条语句死循环了   代码如下

void USART5_Config(void)
{
        GPIO_InitTypeDef GPIO_InitStructure;
        USART_InitTypeDef USART_InitStructure;
        /* config UART5 clock */
        RCC_APB1PeriphClockCmd(RCC_APB1Periph_UART5, ENABLE);
        RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC|RCC_APB2Periph_GPIOD, ENABLE);
       
        /* UART5 GPIO config */
   /* Configure UART5 Tx (PC.12) as alternate function push-pull */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOC, &GPIO_InitStructure);
            
  /* Configure UART5 Rx (PD.02) as input floating */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(GPIOD, &GPIO_InitStructure);

          
        /* UART5 mode config */
        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_Init(UART5, &USART_InitStructure);
void USART_SendDatapoll(uint16_t Data)
{
        //Delayms(1);
        USART_SendData(UART5, Data);
    while (USART_GetFlagStatus(UART5,USART_FLAG_TC) ==RESET);//轮询直到发送数据完毕
        //Delayms(1);
               
               
}

       
    USART_ITConfig(UART5, USART_IT_RXNE, ENABLE);
       
    USART_ITConfig(UART5, USART_IT_TC, DISABLE);
        USART_Cmd(UART5, ENABLE);
        //USART_ClearFlag(UART5, USART_FLAG_TC); // 清标志
       
}

你这样试一下  while(USART_GetFlagStatus(UART5,USART_FLAG_TXE)==RESET)

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