【FreeRTOS】小白进阶之任务如何共用FreeRTOS软件定时器回调函数（二）

介绍两个定时器任务如何通过定时器 handle 共用一个回调函数。

1、头文件声明和函数定义

  

   

    

     

    
    

     

      #include "FreeRTOS.h"
     
    
   

    

     

    
    

     

      #include "task.h"
     
    
   

    

     

    
    

     

      #include "timers.h"
     
    
   

    

     

    
    

     

      #include "supporting_functions.h"
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      #define mainONE_SHOT_TIMER_PERIOD ( pdMS_TO_TICKS( 3333UL ) )
     
    
   

    

     

    
    

     

      #define mainAUTO_RELOAD_TIMER_PERIOD ( pdMS_TO_TICKS( 500UL ) )
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      // 定时器共用回调函数
     
    
   

    

     

    
    

     

      static void prvTimerCallback( TimerHandle_t xTimer );
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      // 定时器 handle 定义
     
    
   

    

     

    
    

     

      static TimerHandle_t xAutoReloadTimer, xOneShotTimer;
     
    
  
 

2、启动定时任务

  

   

    

     

    
    

     

      int main( void )
     
    
   

    

     

    
    

     

      {
     
    
   

    

     

    
    

     

      	BaseType_t xTimer1Started, xTimer2Started;
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
	// 定义 one-shot 定时任务
     
    
   

    

     

    
    

     

      	xOneShotTimer = xTimerCreate( "OneShot",				
     
    
   

    

     

    
    

     

      								  mainONE_SHOT_TIMER_PERIOD,	
     
    
   

    

     

    
    

     

      								  pdFALSE,					
     
    
   

    

     

    
    

     
								  0,							
     
    
   

    

     

    
    

     

      								  prvTimerCallback );		
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
	// 定义自动重载定时任务
     
    
   

    

     

    
    

     

      	xAutoReloadTimer = xTimerCreate( "AutoReload",		
     
    
   

    

     

    
    

     

      									 mainAUTO_RELOAD_TIMER_PERIOD,	
     
    
   

    

     

    
    

     

      									 pdTRUE,					
     
    
   

    

     

    
    

     
									 0,								
     
    
   

    

     

    
    

     

      									 prvTimerCallback );	
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
	if( ( xOneShotTimer != NULL ) && ( xAutoReloadTimer != NULL ) )
     
    
   

    

     

    
    

     

      	{
     
    
   

    

     

    
    

     
		// 启动定时任务
     
    
   

    

     

    
    

     

      		xTimer1Started = xTimerStart( xOneShotTimer, 0 );
     
    
   

    

     

    
    

     

      		xTimer2Started = xTimerStart( xAutoReloadTimer, 0 );
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
		if( ( xTimer1Started == pdPASS ) && ( xTimer2Started == pdPASS ) )
     
    
   

    

     

    
    

     

      		{
     
    
   

    

     

    
    

     
			/* Start the scheduler. */
     
    
   

    

     

    
    

     
			vTaskStartScheduler();
     
    
   

    

     

    
    

     

      		}
     
    
   

    

     

    
    

     

      	}
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
	for( ;; );
     
    
   

    

     

    
    

     
	return 0;
     
    
   

    

     

    
    

     

      }
     
    
  
 

3、软件定时器回调函数

  

   

    

     

    
    

     

      static void prvTimerCallback( TimerHandle_t xTimer )
     
    
   

    

     

    
    

     

      {
     
    
   

    

     

    
    

     

      	TickType_t xTimeNow;
     
    
   

    

     

    
    

     
	uint32_t ulExecutionCount;
     
    
   

    

     

    
    

     
	
     
    
   

    

     

    
    

     

      	ulExecutionCount = ( uint32_t ) pvTimerGetTimerID( xTimer );
     
    
   

    

     

    
    

     

      	ulExecutionCount++;
     
    
   

    

     

    
    

     
	vTimerSetTimerID( xTimer, ( void * ) ulExecutionCount );
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      	xTimeNow = xTaskGetTickCount();
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
	if( xTimer == xOneShotTimer )
     
    
   

    

     

    
    

     

      	{
     
    
   

    

     

    
    

     
		vPrintStringAndNumber( "One-shot timer callback executing", xTimeNow );
     
    
   

    

     

    
    

     

      	}
     
    
   

    

     

    
    

     
	else
     
    
   

    

     

    
    

     

      	{
     
    
   

    

     

    
    

     
		vPrintStringAndNumber( "Auto-reload timer callback executing", xTimeNow );
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
		if( ulExecutionCount == 5 )
     
    
   

    

     

    
    

     

      		{
     
    
   

    

     

    
    

     
			xTimerStop( xTimer, 0 );
     
    
   

    

     

    
    

     

      		}
     
    
   

    

     

    
    

     

      	}
     
    
   

    

     

    
    

     

      }
     
    
  
 

文章来源: blog.csdn.net，作者：简一商业，版权归原作者所有，如需转载，请联系作者。

原文链接：blog.csdn.net/liwei16611/article/details/82590026