• 基于小熊派Hi3861鸿蒙开发的IoT物联网学习【三】


    软件定时器:是基于系统Tick时钟中断且由软件来模拟的定时器,当经过设定的Tick时钟计数值后会触发用户定义的回调函数。定时精度与系统Tick时钟的周期有关。

    定时器运行机制:

    cmsis_os2的API软件定时器接口:


    ⚫ 静态裁剪:能通过宏关闭软件定时器功能。
    ⚫ 软件定时器创建:osTimerNew (osTimerFunc_t func, osTimerType_t type, void *argument, const osTimerAttr_t *attr);
    ⚫ 软件定时器启动:osTimerStart (osTimerId_t timer_id, uint32_t ticks);
    ⚫ 软件定时器停止:osTimerStop (osTimerId_t timer_id);
    ⚫ 软件定时器删除:osTimerDelete (osTimerId_t timer_id);
    ⚫ 软件定时器剩余Tick数获取:

    #include <stdio.h>
    #include <string.h>
    #include <unistd.h>
    
    #include "ohos_init.h"
    #include "cmsis_os2.h"
    
    uint32_t exec1, exec2;//typedef unsigned int    uint32_t;
    /***** 定时器1 回调函数 *****/
    ////arg 是一个void的指针变量,指向一个地址
    void Timer1_Callback(void *arg)
    {
        (void)arg;
        printf("This is BearPi Harmony Timer1_Callback!
    ");
    }
    
    /***** 定时器2 回调函数 *****/
    void Timer2_Callback(void *arg)
    {
        (void)arg;
        printf("This is BearPi Harmony Timer2_Callback!
    ");
    }
    
    /***** 定时器创建 *****/
    static void Timer_example(void)
    {
        osTimerId_t id1, id2;
        uint32_t timerDelay; //延迟时间  unsigned int 类型
        osStatus_t status; //状态是枚举值
    
        exec1 = 1U;
        id1 = osTimerNew(Timer1_Callback, osTimerPeriodic, &exec1, NULL);
        if (id1 != NULL)
        {
            // Hi3861 1U=10ms,100U=1S
            timerDelay = 100U;//延迟1s
    
            status = osTimerStart(id1, timerDelay);
            if (status != osOK)
            {
                // Timer could not be started
            }
        }
    
        exec2 = 1U;
        id2 = osTimerNew(Timer2_Callback, osTimerPeriodic, &exec2, NULL);
        if (id2 != NULL)
        {
    
            // Hi3861 1U=10ms,300U=3S
            timerDelay = 300U;
    
            status = osTimerStart(id2, timerDelay);
            if (status != osOK)
            {
                // Timer could not be started
            }
        }
    }
    
    APP_FEATURE_INIT(Timer_example);

    hpm dist 编译----------->HiBurn烧录--------------------- >运行看log

     

    心有猛虎,细嗅蔷薇
  • 相关阅读:
    Restful API
    Vue之指令
    Scrapy框架
    爬虫提高性能:串行、线程进程、异步非阻塞
    MongoDB
    Beautifulsoup模块
    请求库之selenium
    php 正则匹配中文
    Javascript的"预编译"思考
    PHP程序员面试技巧之口试题分享
  • 原文地址:https://www.cnblogs.com/1314520xh/p/14979456.html
Copyright © 2020-2023  润新知