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README
Apache-2.0

FreeMQ

介绍

8051的消息队列组件,使用消息队列机制轻松降低代码复杂度.减少使用延时函数的使用频率,提高CPU利用率.需要适应将自己的程序写成异步的形式.本组件适合flash比较小的场景使用,如果flash比较大建议使用Open-ELL的antos,还有rtos.

软件架构

在FreeMQ.h有个定义

//空的消息ID,不要在正常业务使用空的消息ID,不然无效
#define EMPTYMSGID 0xFF
//最大消息数,如果编译显示内存不够需要减少消息队列容量,如果业务系统复杂需要加到数量,不然满了再加会丢消息
#define MAXMSGCOUNT 5

原理是有个定时器每1耗秒给一个时间戳给主队列加1,添加消息进队列后根据先后顺序和延迟时间来触发消息,这样几乎不用写delay的函数.并且不用把main函数搞的很复杂,一堆标志位.

默认使用主队列就可以满足大部分需求,还支持创建多个队列.

安装教程

  1. 克隆项目
  2. 编译运行项目就可看到LED在P12闪烁
  3. 如果要移植到别的项目只需要拷贝FreeMQ.h,FreeMQ.h,Timer.h加入到项目

使用说明

  1. 在main函数加如下代码

    //初始化消息队列,加如消息处理回调
    FreeMQMainInit(&FreeMQMsgHandle);
    ...其他初始化
    //开始计时器
    Timer0Init();
    //添加一个消息,主循环开始后10耗秒后就会触发,也可不用延时直接触发
    FreeMQSendMessageToMainLater(MSG_START, 10);
    while (1)
    {
        //循环执行如有事件需要触发会触发
        FreeMQMainLoop();
    }
  2. 实现定时器初始化与中断函数

    //初始化定时器0
    void Timer0Init(void) // 1毫秒@24.000MHz
    {
        Timer0_Stop();								 //停止计数
        TMOD = (TMOD & ~0x03) | TIM_16BitAutoReload; //工作模式,0: 16位自动重装, 1: 16位定时/计数, 2: 8位自动重装, 3: 不可屏蔽16位自动重装
        Timer0_1T();
        Timer0_CLKO_Disable(); //输出时钟使能
        T0_Load(65536UL - (MAIN_Fosc / 1000UL));
        Timer0_Run();
        Timer0_InterruptEnable();
    }
    //定时器0回调时,让主队列计时器进行累加
    void Timer0IntHandle(void) interrupt TIMER0_VECTOR
    {
        FreeMQMainTick(1);
    }
  3. 实现消息处理函数

    void FreeMQMsgHandle(u8 msgid)
    {
        switch (msgid)
        {
        case MSG_MainLoop: //主循环
            MainLoopRun();
            //喂看门狗
            FreeMQSendMessageToMainLater(MSG_MainLoop, 500); //主循环每500ms循环一次
            break;
        case MSG_START: //程序启动
            Startup();
            break;
        case MSG_LEDOn: //打开LED
            LEDOn();
            FreeMQSendMessageToMainLater(MSG_LEDOff, 1000);
            break;
        case MSG_LEDOff: //关闭LED
            LEDOff();
            FreeMQSendMessageToMainLater(MSG_LEDOn, 500);
            break;
        }
    }

参与贡献

  1. Fork 本仓库
  2. 新建 Feat_xxx 分支
  3. 提交代码
  4. 新建 Pull Request

目前存在的问题还在解决欢迎大家一起完善

  1. 时间戳是4字节的,需要在累加时发现够大了就复位时间和消息,不然会导致时间爆了就会混乱了------已解决
  2. 需要在列表处理的时候进行锁定机制,避免主函数在操作列表时中断添加消息导致错乱
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简介

8051的消息队列组件,使用消息队列机制轻松降低代码复杂度.减少使用延时函数提高CPU利用率 展开 收起
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