FreeRTOS软件定时器

一、简介

二、实验

//创建一个单次定时器和一个周期定时器，打开两个定时器然后等待10s关闭定时器，此时会发现单次定时器打印1次停止，周期定时器打印5次停止
#include "FreeRTOS_demo.h"

#define START_TASK_PRIO         1
#define START_TASK_STACK_SIZE   128
TaskHandle_t    start_task_handler;
void start_task( void * pvParameters );

/* TASK1 任务 配置
 * 包括: 任务句柄 任务优先级 堆栈大小 创建任务
 */
#define TASK1_PRIO         2
#define TASK1_STACK_SIZE   128
TaskHandle_t    task1_handler;
void task1( void * pvParameters );

void timer1_callback( TimerHandle_t pxTimer );
void timer2_callback( TimerHandle_t pxTimer );

void freertos_demo(void)
{    
    xTaskCreate((TaskFunction_t         )   start_task,
                (char *                 )   "start_task",
                (configSTACK_DEPTH_TYPE )   START_TASK_STACK_SIZE,
                (void *                 )   NULL,
                (UBaseType_t            )   START_TASK_PRIO,
                (TaskHandle_t *         )   &start_task_handler );
    vTaskStartScheduler();
}

TimerHandle_t timer1_handle = 0;    /* 单次定时器 */
TimerHandle_t timer2_handle = 0;    /* 周期定时器 */

void start_task( void * pvParameters )
{
    taskENTER_CRITICAL();               /* 进入临界区 */
    
    /* 单次定时器 */
    timer1_handle = xTimerCreate( "timer1", 
                                    500,
                                    pdFALSE,
                                    (void *)1,
                                    timer1_callback );
                            
    /* 周期定时器 */
    timer2_handle = xTimerCreate( "timer2", 
                                    2000,
                                    pdTRUE,
                                    (void *)2,
                                    timer2_callback );
                                    
    xTaskCreate((TaskFunction_t         )   task1,
                (char *                 )   "task1",
                (configSTACK_DEPTH_TYPE )   TASK1_STACK_SIZE,
                (void *                 )   NULL,
                (UBaseType_t            )   TASK1_PRIO,
                (TaskHandle_t *         )   &task1_handler );
                                             
    vTaskDelete(NULL);
    taskEXIT_CRITICAL();                /* 退出临界区 */
}

/* 任务一，按键扫描并控制软件定时器 */
void task1( void * pvParameters )
{
    uint8_t key = 0;
	xTimerStart(timer1_handle,portMAX_DELAY);
    xTimerStart(timer2_handle,portMAX_DELAY);
	
	vTaskDelay(10000);
	
    xTimerStop(timer1_handle,portMAX_DELAY);
    xTimerStop(timer2_handle,portMAX_DELAY);
    while(1) 
    {

        
    }
}

/* timer1的超时回调函数 */
void timer1_callback( TimerHandle_t pxTimer )
{
    static uint32_t timer = 0;
    printf("timer1的运行次数：%d\r\n",++timer);
}

/* timer2的超时回调函数 */
void timer2_callback( TimerHandle_t pxTimer )
{
    static uint32_t timer = 0;
    printf("timer2的运行次数：%d\r\n",++timer);
}