我主程序就是1号灯的200ms闪烁，usart2串口中断，中断程序是2号灯的反转。正常现象应该是1号灯闪烁，然后我发送个串口数据，然后2号灯反转一下，以此循环。  但是实际现象是，我没发送串口数据时，1号灯200ms闪烁，当我发送一个串口数据时，1号灯不闪了，2号灯也没反应。然后不论怎样，2个灯都不变了。  这是一个很简单的程序，大神估计看一下就能知道我哪错了，但是我找了好几天了啊，一直单步也找不到，拜托了！
[mw_shl_code=c,true]int main(void) { OS_ERR err; BSP_IntInit (); NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); CPU_Init(); Mem_Init(); BSP_IntDisAll(); OSInit(&err); /*---------------------Init uC/OS-III---------------------------*/ OSTaskCreate((OS_TCB *)&AppTaskStartTCB, (CPU_CHAR *)"App Task Start", (OS_TASK_PTR )AppTaskStart, (void *)0u, (OS_PRIO )APP_CFG_TASK_START_PRIO, (CPU_STK *)&AppTaskStartStk[0u], (CPU_STK_SIZE )AppTaskStartStk[APP_CFG_TASK_START_STK_SIZE / 10u], (CPU_STK_SIZE )APP_CFG_TASK_START_STK_SIZE, (OS_MSG_QTY )0u, (OS_TICK )0u, (void *)0u, (OS_OPT )(OS_OPT_TASK_STK_CHK | OS_OPT_TASK_STK_CLR), (OS_ERR *)&err); void uart_init(void); uart_init(); OSStart(&err); while (DEF_ON) { }; } void uart_init(void){ USART_InitTypeDef USART_InitStructure; GPIO_InitTypeDef GPIO_InitStructure; RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE); RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE); USART_DeInit(USART2); GPIO_PinAFConfig(GPIOD, GPIO_PinSource5, GPIO_AF_USART2); GPIO_PinAFConfig(GPIOD, GPIO_PinSource6, GPIO_AF_USART2); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6; 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_100MHz; GPIO_Init(GPIOD, &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(USART2, &USART_InitStructure); /*---------------------interrupt初始化---------------------------*/ NVIC_InitTypeDef NVIC_InitStructure; NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); USART_ITConfig(USART2,USART_IT_RXNE,ENABLE); void USART2_IRQHandler(void); BSP_IntVectSet(BSP_INT_ID_USART2, USART2_IRQHandler); BSP_IntPrioSet(BSP_INT_ID_USART2,2u); USART_ITConfig(USART2, USART_IT_RXNE, ENABLE); USART_Cmd(USART2, ENABLE); } /*---------------------中断程序---------------------------*/ void USART2_IRQHandler(void) { unsigned char ch; if(USART_GetITStatus(USART2, USART_IT_RXNE) != RESET) { USART_ClearFlag(USART2,USART_FLAG_RXNE); USART_ClearITPendingBit(USART2,USART_IT_RXNE); ch = USART_ReceiveData(USART2); BSP_LED_Toggle(2u); } } static void AppTaskStart (void *p_arg) { OS_ERR err; (void)p_arg; BSP_Init(); BSP_Tick_Init(); BSP_LED_Off(0u); while (DEF_TRUE) { BSP_LED_Toggle(1u); OSTimeDlyHMSM(0u, 0u, 0u, 200u, OS_OPT_TIME_HMSM_STRICT, &err); } }[/mw_shl_code]