uC/OS-II源码分析（二）

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2）使用消息邮箱

#define           TASK_STK_SIZE      512
#define           TASK_START_ID        0                 /* 任务ID*/
#define           TASK_CLK_ID          1
#define           TASK_1_ID            2
#define           TASK_2_ID            3
#define           TASK_3_ID            4
#define           TASK_4_ID            5
#define           TASK_5_ID            6

#define           TASK_START_PRIO     10                 /* 任务优先级*/
#define           TASK_CLK_PRIO       11
#define           TASK_1_PRIO         12
#define           TASK_2_PRIO         13
#define           TASK_3_PRIO         14
#define           TASK_4_PRIO         15
#define           TASK_5_PRIO         16
OS_STK         TaskStartStk[TASK_STK_SIZE];
OS_STK         TaskClkStk[TASK_STK_SIZE];
OS_STK         Task1Stk[TASK_STK_SIZE];
OS_STK         Task2Stk[TASK_STK_SIZE];
OS_STK         Task3Stk[TASK_STK_SIZE];
OS_STK         Task4Stk[TASK_STK_SIZE];
OS_STK         Task5Stk[TASK_STK_SIZE];
OS_EVENT     *AckMbox;                                /* 任务和使用的消息邮箱*/
OS_EVENT     *TxMbox;

void main (void)
{
     OS_STK *ptos;
     OS_STK *pbos;
     INT32U   size;
     PC_DispClrScr(DISP_FGND_WHITE);
     OSInit();
     PC_DOSSaveReturn();
     PC_VectSet(uCOS, OSCtxSw);
     PC_ElapsedInit();
     ptos        = &TaskStartStk[TASK_STK_SIZE - 1];
     pbos        = &TaskStartStk[0];
     size        = TASK_STK_SIZE;
     OSTaskStkInit_FPE_x86(&ptos, &pbos, &size);
     OSTaskCreateExt(TaskStart,
         (void *)0,
         ptos,
         TASK_START_PRIO,
         TASK_START_ID,
         pbos,
         size,
         (void *)0,
         OS_TASK_OPT_STK_CHK | OS_TASK_OPT_STK_CLR);
     OSStart();
}
void   TaskStart (void *pdata)
{
#if OS_CRITICAL_METHOD == 3
     OS_CPU_SR   cpu_sr;
#endif
     INT16S      key;
     pdata = pdata;
     TaskStartDispInit();
     OS_ENTER_CRITICAL();
     PC_VectSet(0x08, OSTickISR);
     PC_SetTickRate(OS_TICKS_PER_SEC);
     OS_EXIT_CRITICAL();
     OSStatInit();
     AckMbox = OSMboxCreate((void *)0);                     /* 创建两个消息邮箱*/
     TxMbox  = OSMboxCreate((void *)0);
     TaskStartCreateTasks();
    for (;;) {
         TaskStartDisp();

        if (PC_GetKey(&key)) {
            if (key == 0x1B) {
                 PC_DOSReturn();
             }
         }
         OSCtxSwCtr = 0;
         OSTimeDly(OS_TICKS_PER_SEC);
     }
}
void   Task1 (void *pdata)
{
     INT8U        err;
     OS_STK_DATA data;                       /* 任务堆栈数据*/
     INT16U       time;
     INT8U        i;
    char         s[80];
     pdata = pdata;
    for (;;) {
        for (i = 0; i < 7; i++) {
             PC_ElapsedStart();
             err  = OSTaskStkChk(TASK_START_PRIO + i, &data);//执行堆栈检查
             time = PC_ElapsedStop();
            if (err == OS_NO_ERR) {
                 sprintf(s, "%4ld         %4ld         %4ld         %6d",
                     data.OSFree + data.OSUsed,
                     data.OSFree,
                     data.OSUsed,
                     time);
                 PC_DispStr(19, 12 + i, s, DISP_FGND_BLACK + DISP_BGND_LIGHT_GRAY);
             }
         }
         OSTimeDlyHMSM(0, 0, 0, 100);                       /* 挂起mS*/
     }
}
void   Task4 (void *data)
{
    char    txmsg;
     INT8U   err;
     data  = data;
     txmsg = 'A';
    for (;;) {
         OSMboxPost(TxMbox, (void *)&txmsg);      /* 发消息给Task #5*/
         OSMboxPend(AckMbox, 0, &err);            /* 等待Task #5的应答消息*/
         txmsg++;                                 /*下一个要发的消息数据*/
        if (txmsg == 'Z') {
             txmsg = 'A';                         /* 循环发送A-Z*/
         }
     }
}
void   Task5 (void *data)
{
    char  *rxmsg;
     INT8U   err;
     data = data;
    for (;;) {
         rxmsg = (char *)OSMboxPend(TxMbox, 0, &err); /* 等待来自Task #4的数据*/
         PC_DispChar(70, 18, *rxmsg, DISP_FGND_YELLOW + DISP_BGND_BLUE);
         OSTimeDlyHMSM(0, 0, 1, 0); /* 挂起秒，让给其他任务运行*/
         OSMboxPost(AckMbox, (void *)1); /*发送接收到数据的应答消息*/
     }
}