ex1.c

ucos在DSP40上的移植,可以用,在ucos网站上下的!

/*
*********************************************************************************************************
*                                                uC/OS-II
*                                          The Real-Time Kernel
*
*                        (c) Copyright 1992-1998, Jean J. Labrosse, Plantation, FL
*                                           All Rights Reserved
*
*                                                 V2.00
*
*                                               EXAMPLE #1
*********************************************************************************************************
*/

#include "includes.h"

/*
*********************************************************************************************************
*                                               CONSTANTS
*********************************************************************************************************
*/

#define  TASK_STK_SIZE                  64       /* Size of each task's stacks (# of WORDs)            */
#define  N_TASKS                        4        /* Number of identical tasks                          */

/*
*********************************************************************************************************
*                                               VARIABLES
*********************************************************************************************************
*/

OS_STK           TaskStk[N_TASKS][TASK_STK_SIZE];     /* Tasks stacks                                  */
OS_STK           TaskStartStk[TASK_STK_SIZE];
char             TaskData[N_TASKS];                   /* Parameters to pass to each task               */
OS_EVENT        *RandomSem;

/*
*********************************************************************************************************
*                                           FUNCTION PROTOTYPES
*********************************************************************************************************
*/

void   Task(void *data);                              /* Function prototypes of tasks                  */
void   TaskStart(void *data);                         /* Function prototypes of Startup task           */

/*$PAGE*/
/*
*********************************************************************************************************
*                                                MAIN
*********************************************************************************************************
*/

void main (void)
{
    OSInit();                                              /* Initialize uC/OS-II                      */
    C40_Init();                                            /* IACK, clear iie, setup ivtp, tvtp        */
    C40_VectSet(uCOS, OSCtxSw);                            /* Install uC/OS-II's context switch vector */
    RandomSem = OSSemCreate(1);                            /* Random number semaphore                  */
    OSTaskCreate(TaskStart, (void *)0, (void *)&TaskStartStk[0], 0);
    OSStart();                                             /* Start multitasking                       */
}

/*$PAGE*/
/*
*********************************************************************************************************
*                                              STARTUP TASK
*********************************************************************************************************
*/
void TaskStart (void *data)
{
    UBYTE  i;

    OS_ENTER_CRITICAL();
    C40_VectSet(0x02, OSTickISR);                          /* Install uC/OS-II's clock tick ISR        */
    C40_SetTickRate(OS_TICKS_PER_SEC);                     /* Reprogram tick rate and start timer      */
    C40_EnableInt( TIMER0 );
    OS_EXIT_CRITICAL();

    for (i = 0; i < N_TASKS; i++) {                        /* Create N_TASKS identical tasks           */
        TaskData[i] = i;
        OSTaskCreate(Task, (void *)&TaskData[i], (void *)&TaskStk[i][0], i + 1);
    }

    for (;;) {

        OSCtxSwCtr = 0;

        OSTimeDlyHMSM(0, 0, 1, 0);                         /* Wait one second                          */
    }
}
/*$PAGE*/
/*
*********************************************************************************************************
*                                                  TASKS
*********************************************************************************************************
*/

volatile int t0 = 0;
volatile int t1 = 0;
volatile int t2 = 0;
volatile int t3 = 0;


void Task (void *data)
{
    UBYTE x;
    UBYTE y;
    UBYTE err;

    for (;;) {
        OSSemPend(RandomSem, 0, &err);           /* Acquire semaphore        */
	switch( *(int*)data ){
	    case 0:
		t0++;
		break;
	    case 1:
		t1++;
		break;
	    case 2:
		t2++;
		break;
	    case 3:
		t3++;
		break;
	    default:
		break;
	}
	
	OSSemPost(RandomSem);                    /* Release semaphore                                  */

        OSTimeDly(1);                            /* Delay 1 clock tick                                 */
    }
}