(uC/OS-II学习笔记) 消息邮箱&&消息队列

原文出处：

http://www.cnblogs.com/hebaichuanyeah

与信号量一样，消息邮箱与消息列队都是一种事件块。

消息邮箱可以在任务间实现信息传递。

比如，在任务1中发送一条消息，任务2中接受，并发至串口终端显示。

OS_EVENT * MyMbox;


void Task_1(void *pdata)
{
    char SendData[] = "hello world  ";
    
#if OS_CRITICAL_METHOD == 3   //关中断的方法为3
    OS_CPU_SR cpu_sr;
#endif
    
    OS_ENTER_CRITICAL();
    OS_CPU_SysTickInit(100000000/OS_TICKS_PER_SEC);
    OS_EXIT_CRITICAL();
    
    OSStatInit();   //统计任务 优先级最低
       
    MyMbox = OSMboxCreate((void*)0);
    
    //PIT0_Init(50000000);
    UART4_Init(115200);
    init_LED();
    
    pdata = pdata;                              

    
    
    while(1)
    {

        OSTaskResume(6);

        OSMboxPost(MyMbox,&SendData);

        OSTimeDly(500);       
    }
    
}

void Task_2(void *pdata)
{
    U32 i;
    U8 err;    
    char * ReceiveData = "";    
    pdata = pdata;                              

    while(1)
    {

        ReceiveData = OSMboxPend(MyMbox,10,&err);
        for(i=0;ReceiveData[i];i++)
            Uart4_SendByte(ReceiveData[i]);    
         
        OSTaskSuspend(6);
       
    }
  
}

消息队列

OS_EVENT * MyQ;


void Task_1(void *pdata)
{
    U8 i;
    char * MyMessage[5];
    void * ArrayOfMsg[5];
    
    MyMessage[0] = "This Message One    ";
    MyMessage[1] = "This Message Two    ";
    MyMessage[2] = "This Message Three  ";
    MyMessage[3] = "This Message Four   ";
    MyMessage[4] = "This Message Five   ";
    
    

#if OS_CRITICAL_METHOD == 3   //关中断的方法为3
    OS_CPU_SR cpu_sr;
#endif
    
    OS_ENTER_CRITICAL();
    OS_CPU_SysTickInit(100000000/OS_TICKS_PER_SEC);
    OS_EXIT_CRITICAL();
    
    OSStatInit();   //统计任务 优先级最低
    
       
    MyQ = OSQCreate(&ArrayOfMsg[0],5);
    
    //PIT0_Init(50000000);
    UART4_Init(115200);
    init_LED();
    
    pdata = pdata;                              

    
    
    while(1)
    {

        OSTaskResume(6);
        for(i=0;i<5;i++)
        {
            OSQPost(MyQ,&MyMessage[i][0]);
        }
        
        OSTimeDly(500);       
    }
    
}

void Task_2(void *pdata)
{
    U32 i;
    U8 err,count;    
    char * ReceiveData;    
    pdata = pdata;                              

    while(1)
    {
        for(count=0;count<5;count++)
        {
            ReceiveData = OSQPend(MyQ,0,&err);
            for(i=0;ReceiveData[i]!='';i++)
                Uart4_SendByte(ReceiveData[i]);    
        }
        
        for(i=0;i<100;i++)
            Uart4_SendByte(' ');          
        OSTaskSuspend(6);
       
    }
  
}