UART初始化时出现问题

yaoxiaofeng

mian（）中初始化时   当运行到这句时USART_ITConfig(USART1, USART_IT_TXE, ENABLE);，直接死在这里了。把这句注释掉后一切正常。请原点大神指导！ 

/*******************************************************************************

* Function Name : USART_Configuration

* Description   : Configure USART1 

* Input         : None

* Output         : None

* Return         : None  

* Attention : None

*******************************************************************************/

void USART1_Configuration(void)

   { 

GPIO_InitTypeDef GPIO_InitStructure;

USART_InitTypeDef USART_InitStructure; 

RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO ,ENABLE);   //???????¨??

/*

*  USART1_TX -> PA9 , USART1_RX -> PA10

*/

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;         

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;  //·???????

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; 

GPIO_Init(GPIOA, &GPIO_InitStructure);   

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;        

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //???????? 

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; 

GPIO_Init(GPIOA, &GPIO_InitStructure);

USART_InitStructure.USART_BaudRate = 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;

    USART_Init(USART1, &USART_InitStructure); 

    

USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);  

  USART_ITConfig(USART1, USART_IT_TXE, ENABLE);

    USART_ClearFlag(USART1,USART_FLAG_TC);

    USART_ClearFlag(USART1,USART_FLAG_RXNE);

    USART_Cmd(USART1, ENABLE);

    delay_ms(10);

   }

void USART1_NVIC_Configuration(void)

   {

NVIC_InitTypeDef NVIC_InitStructure;

  /* Enable the USART1 Interrupt */

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);

    NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;

    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;

    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;

  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

    NVIC_Init(&NVIC_InitStructure);

   }

 

正点原子

没有中断服务函数吧。