ext3.c

一个小型的实时操作系统 对理解操作系统有很好的帮助

/*********************************************************************************************************
**                                        Small RTOS
**                                   The Real-Time Kernel
**                           (c) Copyright 2002-2003, chenmingji
**                                     All Rights Reserved
**                                      V1.50.0 内部测试版
**
**--------------文件信息--------------------------------------------------------------------------------
**文   件   名: ext3.c
**创   建   人: 陈明计
**最后修改日期: 2004年8月8日
**描        述: ext3源代码。
**
********************************************************************************************************/


#include "config.h"

void TaskA(void *Pdata);
void TaskB(void *Pdata);
void TaskC(void *Pdata);

OS_STK        TaskStk[3][512];

        int main(void)
{
    OSInit();

    OSSetRoundTick(6,2);
    OSTaskCreate(TaskA, NULL, &(TaskStk[0][512 -1]), 4, 0, 512, USR32Mode, 0);
    while(1)
    {
        PCON = PCON | 0x01;                     /* CPU进入休眠状态 */
    }
}

                            void TaskA(void *Pdata)
{
    uint8 *p;
    uint8  c;

    Pdata = Pdata;
    TargetInit();
    OSTaskCreate(TaskB, NULL, &(TaskStk[1][512 -1]), 5, 1, 512, USR32Mode, 0);
    OSTaskCreate(TaskC, NULL, &(TaskStk[2][512 -1]), 6, 2, 512, USR32Mode, 0);
    c = '4';
    while (1)
    {
        OSMsgPost(2, &c);
        p = (uint8 *)OSMsgBackPend(0, &c);
        c = *p;
    } 
}

                            void TaskB(void *Pdata)
{
    uint8 *p;
    uint8  c;

    Pdata = Pdata;
    c = '5';
    while (1)
    {
        OSMsgPost(2, &c);
        p = (uint8 *)OSMsgBackPend(0, &c);
        c = *p;
    }
}

                            void TaskC(void *Pdata)
{
    uint8 *p;
    TASK_ID TaskId;
    uint8  c, err;

    Pdata = Pdata;
    c = '6';
    while (1)
    {
        p = (uint8 *)OSMsgPend(0, &TaskId, &err);
        err = *p;
        OSMsgBackPost(TaskId, &c);
    }
}
/*********************************************************************************************************
**                            End Of File
********************************************************************************************************/