原创 stm32不能进入串口收中断，求解答

  /* Output a message on Hyperterminal using printf function */
      while( 1 )
      {
       
      } 

}
/**
  * @brief  Retargets the C library printf function to the USART.
  * @param  None
  * @retval None
  */

PUTCHAR_PROTOTYPE
{
  /* Place your implementation of fputc here */
  /* e.g. write a character to the USART */
  USART_SendData(USART1, (uint8_t) ch);

  /* Loop until the end of transmission */
  while (USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET)
  {}

  return ch;
}

#ifdef  USE_FULL_ASSERT

/**
  * @brief  Reports the name of the source file and the source line number
  *         where the assert_param error has occurred.
  * @param  file: pointer to the source file name
  * @param  line: assert_param error line source number
  * @retval None
  */
void assert_failed(uint8_t* file, uint32_t line)
{
  /* User can add his own implementation to report the file name and line number,
     ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */

  /* Infinite loop */
  while (1)
  {
  }
}
#endif

/**
  * @}
  */
//RCC时钟配置

void RCC_cfg()
{
       ErrorStatus HSEStartUpStatus;//定义错误状态变量
       RCC_DeInit();//将RCC寄存器重新设置为默认值
       RCC_HSEConfig(RCC_HSE_ON);//打开外部高速时钟晶振
       HSEStartUpStatus = RCC_WaitForHSEStartUp();//等待外部高速时钟晶振工作

       if(HSEStartUpStatus == SUCCESS)

       {
              RCC_HCLKConfig(RCC_SYSCLK_Div1);//设置AHB时钟(HCLK)为系统时钟
              RCC_PCLK2Config(RCC_HCLK_Div1);//设置高速AHB时钟(APB2)为HCLK时钟
              RCC_PCLK1Config(RCC_HCLK_Div2);//设置低速AHB时钟(APB1)为HCLK的2分频
              FLASH_SetLatency(FLASH_Latency_2);//设置FLASH代码延时
              FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);//使能预取指缓存
             
              RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_6);//设置PLL时钟，为HSE的9倍频 8MHz * 9 = 72MHz
              RCC_PLLCmd(ENABLE);//使能PLL
             
              while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET);//等待PLL准备就绪
              RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);//设置PLL为系统时钟源

              while(RCC_GetSYSCLKSource() != 0x08);//判断PLL是否是系统时钟

       }

         //打开GPIO时钟，复用功能，串口1的时钟

         RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOD | RCC_APB2Periph_AFIO | RCC_APB2Periph_USART1, ENABLE);

}

//IO口配置

void GPIO_cfg()
{
       GPIO_InitTypeDef GPIO_InitStructure;
       GPIO_StructInit(&GPIO_InitStructure);
      
       GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;//PA9作为US1的TX端，打开复用，负责发送数据
       GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
       GPIO_Init(GPIOA , &GPIO_InitStructure);
      
       GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;//PA10作为US1的RX端，负责接收数据
       GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
       GPIO_Init(GPIOA, &GPIO_InitStructure);
      
       GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;//LED显示串口正在发送/接收数据
       GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
       GPIO_Init(GPIOD, &GPIO_InitStructure);
}
//串口初始化

void USART_cfg()
{ 

       USART_InitTypeDef USART_InitStructure;

       USART_StructInit(&USART_InitStructure);  //将结构体设置为缺省状态   
       USART_Init(USART1, &USART_InitStructure); //设置串口1
      
       USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);//打开串口1的收中断响应函数
       USART_ITConfig(USART1, USART_IT_TXE, DISABLE);//先关闭串口1的发中断响应函数
     
       USART_Cmd(USART1, ENABLE);//打开串口1
 USART_ClearITPendingBit(USART1, USART_IT_TC);//清除中断TC位
}

//配置中断

void NVIC_cfg()
{
        NVIC_InitTypeDef NVIC_InitStructure;

        NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);               //选择中断分组2
        NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;             //选择串口1中断
        NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;     //抢占式中断优先级设置为0
        NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;            //响应式中断优先级设置为0
        NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;               //使能中断
        NVIC_Init(&NVIC_InitStructure);
}

/**
  * @}
  */

/******************* (C) COPYRIGHT 2010 STMicroelectronics *****END OF FILE****/

中断程序如下：

void HardFault_Handler(void)
{
  /* Go to infinite loop when Hard Fault exception occurs */
  while (1)
  {
    printf("\n\hard error\n\r");   //测试用
  }
}

void USART1_IRQHandler(void)
{

  if (USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)
  {
    /* received data */
    USART_GetInputString();
  }

  /* If overrun condition occurs, clear the ORE flag
                              and recover communication */
  if (USART_GetFlagStatus(USART1, USART_FLAG_ORE) != RESET)
  {
    (void)USART_ReceiveData(USART1);
  }

  if(USART_GetITStatus(USART1, USART_IT_TXE) != RESET)
  {  
    /* Write one byte to the transmit data register */
    USART_SendBufferData();
  } 
   /* 等待串口接收数据完成或缓存区溢出 */
      if (USART_Rx_Done == 1)
      {
         printf("\n\r欢迎使用skater-STM32  You input String is:\n\r");
         printf("[%s]\n\r",USART_Rx_Buffer);
         USART_Rx_Buffer_Clear();
       }

       GPIO_ResetBits(GPIOD, GPIO_Pin_2);                //设置led灯亮
       for (int jack=0;jack<10;++jack)
       {
         printf("\n\rwelcome to Skater-STM;led on\n\r");
       }
}