stm32 freertos 之串口中断

一、中断处理函数

void USART1_IRQHandler(void)

{

BaseType_t xHigherPriorityTaskWoken;

   xHigherPriorityTaskWoken = pdFALSE;

u8 cChar;

if(USART_GetITStatus (USART1,USART_IT_RXNE)!=RESET)

{

cChar=USART_ReceiveData(USART1);

xQueueSendToBackFromISR (xQueueRx,&cChar,&xHigherPriorityTaskWoken);

portYIELD_FROM_ISR(xHigherPriorityTaskWoken);

}

}

二、中断向量表配置

void NVIC_Configuration(void)

{

NVIC_InitTypeDef  NVIC_InitStructure;

NVIC_PriorityGroupConfig (NVIC_PriorityGroup_4);

NVIC_InitStructure .NVIC_IRQChannel =USART1_IRQn  ;

NVIC_InitStructure .NVIC_IRQChannelPreemptionPriority =6;

NVIC_InitStructure .NVIC_IRQChannelCmd =ENABLE ;

NVIC_Init(&NVIC_InitStructure );

}

三、串口接收任务创建

xQueueHandle xQueueRx;

void vPC_Communication_Task(void *pvParameters)

{

BaseType_t xHigherPriorityTaskWoken;

xHigherPriorityTaskWoken = pdFALSE;

u8 rx=0;

xQueueRx=xQueueCreate(20,sizeof(u8));

while(1)

{

if(xQueueReceiveFromISR(xQueueRx,&rx,&xHigherPriorityTaskWoken))

{

printf("%crn",rx);

}

vTaskDelay(1000/portTICK_RATE_MS );

}

}

四、主函数

int main(void)

{

    BSP_INIT();

    xTaskCreate(vLED_Task ,"led_task",50,NULL,1,NULL);

    xTaskCreate(vPC_Communication_Task,"vPC_Communication_Task",500,NULL,2,NULL);

    vTaskStartScheduler();

}