UCOSIII内建消息队列

使能内建消息队列

将OS_CFG_TASK_Q_EN置1

API函数

#if OS_CFG_TASK_Q_EN > 0u
//删除
OS_MSG_QTY OSTaskQFlush (OS_TCB *p_tcb,
                         OS_ERR *p_err);

//等待-1
void *OSTaskQPend (OS_TICK timeout,
                   OS_OPT opt,
                   OS_MSG_SIZE *p_msg_size,
                   CPU_TS *p_ts,
                   OS_ERR *p_err);

//取消等待
CPU_BOOLEAN OSTaskQPendAbort (OS_TCB *p_tcb,
                              OS_OPT opt,
                              OS_ERR *p_err);

//释放+1
void OSTaskQPost (OS_TCB *p_tcb,
                  void *p_void,
                  OS_MSG_SIZE msg_size,
                  OS_OPT opt,
                  OS_ERR *p_err);
#endif

使用举例

#define TASK_Q_NUM  4       //发任务内建消息队列的长度

void start_task(void *p_arg)
{
    OS_CRITICAL_ENTER();    //进入临界区

    //创建定时器
    OSTmrCreate((OS_TMR     *)&tmr,         //定时器
                (CPU_CHAR   *)"tmr",        //定时器名字
                (OS_TICK     )0,            //0ms
                (OS_TICK     )50,           //50*10=500ms
                (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

    //创建msgpend任务
    OSTaskCreate((OS_TCB    * )&Msgpend_TaskTCB,
                 (CPU_CHAR  * )"msgpend task",
                 (OS_TASK_PTR )msgpend_task,
                 (void      * )0,
                 (OS_PRIO     )MSGPEND_TASK_PRIO,
                 (CPU_STK   * )&MSGPEND_TASK_STK[0],
                 (CPU_STK_SIZE)MSGPEND_STK_SIZE/10,
                 (CPU_STK_SIZE)MSGPEND_STK_SIZE,
                 (OS_MSG_QTY  )0,
                 (OS_TICK     )0,
                 (void      * )0,
                 (OS_OPT      )OS_OPT_TASK_STK_CHK|OS_OPT_TASK_STK_CLR,
                 (OS_ERR    * )&err);

    OS_CRITICAL_EXIT(); //退出临界区
}

//定时器的回调函数
void tmr_callback(void *p_tmr,void *p_arg)
{
    u8 *pbuf;
    static u8 msg_num;
    OS_ERR err;

    pbuf = mymalloc(SRAMIN,10); //申请10个字节
    if(pbuf)    //申请内存成功
    {
        msg_num++;
        sprintf((char*)pbuf,"ALIENTEK %d",msg_num);
        printf("tmr_callback: %s\r\n", pbuf);
        //发送消息
        OSTaskQPost((OS_TCB*    )&Msgpend_TaskTCB,  //向任务msgpend发送消息
                    (void*      )pbuf,
                    (OS_MSG_SIZE)10,
                    (OS_OPT     )OS_OPT_POST_FIFO,
                    (OS_ERR*    )&err);
        if(err != OS_ERR_NONE)
        {
            myfree(SRAMIN,pbuf);    //释放内存
            OSTmrStop(&tmr,OS_OPT_TMR_NONE,0,&err); //停止定时器
            printf("TMR STOP!\r\n");
        }
    }
}

//等待消息队列中的消息
void msgpend_task(void *p_arg)
{
    u8 *p;
    OS_MSG_SIZE size;
    OS_ERR err;
    while(1)
    {
        //请求消息
        p=OSTaskQPend((OS_TICK      )0,
                      (OS_OPT       )OS_OPT_PEND_BLOCKING,
                      (OS_MSG_SIZE* )&size,
                      (CPU_TS*      )0,
                      (OS_ERR*      )&err);
        printf("msgpend_task: %s\r\n", p);
        myfree(SRAMIN,p);   //释放内存
        OSTimeDlyHMSM(0,0,1,0,OS_OPT_TIME_PERIODIC,&err); //延时1s
    }
}

实验现象