STM32F072在跑UCOS时只有第一次进了UART中断服务程序

只看该作者 · 2024-9-30 15:21

我跑裸机的时候在中断里面接收到数据就马上发送出来没有问题，但是在Ucos系统下只有第一次进了UART中断服务程序，ucos其它任务照常运行。这是怎么回事？（备注：接收的是GPS模块传过来的数据,然后在任务中串口输出是没问题的，就是中断接收有问题）
中断服务程序如下：
void USART1_IRQHandler(void)
{
      INT8U i = 0;
      OS_CPU_SR  cpu_sr;

   OS_ENTER_CRItiCAL();
   OSIntNesting++;
   OS_EXIT_CRITICAL();

   while(USART_GetFlagStatus(USART1, USART_FLAG_RXNE) == RESET)
      {
      }
      i = USART_ReceiveData(USART1);
      printf("%c",i);
      OSIntExit();
}
初始化那些应该没问题，跑裸机是可以的
下面是初始化程序:
void NvicInit(void)
{

   NVIC_InitTypeDef  NVIC_InitStructure;

   NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
   NVIC_InitStructure.NVIC_IRQChannelPriority = 0x00;
   NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
   NVIC_Init(&NVIC_InitStructure);
   NVIC_InitStructure.NVIC_IRQChannel = EXTI0_1_IRQn;
   NVIC_InitStructure.NVIC_IRQChannelPriority = 0x03;
   NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
   NVIC_Init(&NVIC_InitStructure);
}

void UartInit(void)
{
            INT8U i;

      GPIO_InitTypeDef  GPIO_InitStructure;
      USART_InitTypeDef USART_InitStructure;

      RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA , ENABLE); // 使能GPIOA端口
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 , ENABLE); // 使能串口1时钟

      GPIO_PinAFConfig(GPIOA ,GPIO_PinSource9, GPIO_AF_1);
      GPIO_PinAFConfig(GPIOA ,GPIO_Pin_10, GPIO_AF_1);
/////////////////////////////////////////////////////////////////////////////////////
      /* PA9==TX PA10-RX  */

      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 ;
      GPIO_InitStructure.GPIO_Mode  = GPIO_Mode_AF;
      GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
      GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_UP;
      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_AF;
      GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_UP;
      GPIO_Init(GPIOA , &GPIO_InitStructure);
/////////////////////////////////////////////////////////////////////////////////////

      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(USART1, &USART_InitStructure);       //串口配置

      USART_ITConfig(USART1, USART_IT_RXNE,ENABLE);//打开中断

      USART_Cmd(USART1, ENABLE);//使能串口1
      USART_ClearFlag(USART1, USART_FLAG_TC);

}