UCOSIII软件定时器

野性酷女 2022-06-01 23:46 185阅读 0赞

**API函数**

//创建
    void OSTmrCreate (OS_TMR *p_tmr,
                      CPU_CHAR *p_name,
                      OS_TICK dly,
                      OS_TICK period,
                      OS_OPT opt,
                      OS_TMR_CALLBACK_PTR p_callback,
                      void *p_callback_arg,
                      OS_ERR *p_err);
    
    //删除
    CPU_BOOLEAN OSTmrDel (OS_TMR *p_tmr,
                          OS_ERR *p_err);
    
    //获取剩余时间
    OS_TICK OSTmrRemainGet (OS_TMR *p_tmr,
                            OS_ERR *p_err);
    
    //启动
    CPU_BOOLEAN OSTmrStart (OS_TMR *p_tmr,
                            OS_ERR *p_err);
    
    //获取当前定时器状态
    OS_STATE OSTmrStateGet (OS_TMR *p_tmr,
                            OS_ERR *p_err);
    
    //停止
    CPU_BOOLEAN OSTmrStop (OS_TMR *p_tmr,
                           OS_OPT opt,
                           void *p_callback_arg,
                           OS_ERR *p_err);

**举例**

OSTmrCreate((OS_TMR     *)&tmr, //定时器
               (CPU_CHAR    *)"tmr",    //定时器名字
               (OS_TICK  )20,           //20*10=200ms
               (OS_TICK  )100,          //100*10=1000ms
               (OS_OPT       )OS_OPT_TMR_PERIODIC, //周期模式
               (OS_TMR_CALLBACK_PTR)tmr_callback,//定时器回调函数
               (void        *)0,            //参数为0
               (OS_ERR      *)&err);        //返回的错误码
    
    //定时器的回调函数
    void tmr_callback(void *p_tmr, void *p_arg)
    {
        static u8 tmr_num=0;
        tmr_num++;      //定时器执行次数加1
        printf("定时器运行结束\r\n");
    }
    
    int main()
    {
        OSTmrStart(&tmr, &err); //开启定时器
    
        OSTmrStop(&tmr, OS_OPT_TMR_NONE, 0, &err);  //关闭定时器
    
        return 0;
    }

**实验现象**  
![1][]

[1]: /images/20220602/28f7b1e9e3734094b8531505067c5d3c.png