example3.c

各种硬件平台上的us OS移植实例(arm6)

/*> example3.c <*/
/*---------------------------------------------------------------------------*/
/*
 * $Revision: 0.1 $
 *   $Author: jsmith $
 *     $Date: 941103 $
 *
 * Copyright (c) 1994, VLSI Technology Inc. All Rights Reserved.
 */
/*---------------------------------------------------------------------------*/

#include	"ucos.h" 	/* uC/OS interface */
#include	"osdefs.h"  /* uC/OS ARM interface */

#define		NUM_TASKS	3	/* must be number in range 1 to 62 */
/*
 * P r o t o t y p e s
 */
void	Task(int *id);
void	Timer_IRQ( void );

/* allocate memory for tasks' stacks */

#define	TASK_STK_SIZE	64
/*
 * G l o b a l   V a r i a b l e s
 */
OS_EVENT	*DispSem;
OS_EVENT	*Mbox[NUM_TASKS];
uint		 TaskStk[NUM_TASKS][TASK_STK_SIZE];
IRQHandlerFn prev_hand;	/* function pointer to previous handler */
/*
 * T a s k
 *
 * This is being used by NUM_TASKS tasks.
 */
void	Task(int *id)
{
 int	msg[NUM_TASKS];
 uint	err;

	while(FOREVER)
		{
		msg[*id] = *(int *)OSMboxPend(Mbox[*id], 0, &err);	/* wait for message */

		SWI_WriteC(msg[*id]);					/* print task's id */

		if(*id < NUM_TASKS)
			{
			OSMboxPost(Mbox[*id+1], (void *)(*id+'1'));
			}
		else
			{
			OSMboxPost(Mbox[0], (void *)'1');
			}

/*OSTimeDly(300);*/					/* Delay 3 second */
		}
}
/*
 * m a i n
 */
int	main( void )
{
 int			id[NUM_TASKS];
 int			j;

 union gp	{
			unsigned char	*b;
			unsigned int	*w;
			} p;
 
	p.b = (unsigned char *) IOBase;

	SWI_Write0("\nExample3 using uC/OS for PID600\n\n\0");
	
	SWI_Write0("\nGenerating ID's...\0");
	
	for(j=0; j<NUM_TASKS; j++)	/* generate the ID's */
		{
		id[j] = j;				/* create an id */
		}

	SWI_Write0("\nDoing an OSInit()...\0");
	
	OSInit();					/* needed by uC/OS */

	DispSem = OSSemCreate( 1 );	/* Display semaphore */

	SWI_Write0("\nCreating the tasks...\0");
	
	for(j=0; j<NUM_TASKS; j++)	/* generate the tasks */
		{
		OSTaskCreate((PTV)Task, (void *)&id[j], (void *)&TaskStk[j][TASK_STK_SIZE], j + 10);
		}

	SWI_Write0("\nCreating the mailboxess...\0");
	
	for(j=0; j<NUM_TASKS; j++)	/* generate the mailboxess */
		{
		Mbox[j] = OSMboxCreate((void *)0);
		}
	
	OSMboxPost(Mbox[0], (void *)'1');	/* get task 1 started */

	SWI_Write0("\nHooking into the C-DEMON's TIMER...\0");
	
	/*
	 * Now HOOK the DEMON's TIMER to uC/OS
	 */

	*(p.b + IRQM) = 0;		/* stop the TIMER interrupt */

	/*
	 * TIMER is bit position 1 in FIQ (vecnum = FIQbitvector+bit1 = 0x20 + 1)
	 */
    if ((prev_hand = ARMInstallIRQHandler(1,Timer_IRQ)) == NULL)
     {
      SWI_Write0("\nError: Unable to install timer handler.\n") ;
     }
	
	*(p.b + IRQM) = TimerIT;		/* restart the TIMER interrupt */

	SWI_Write0("\nDoing an OSStart()...\0");
	
	OSStart();					/* start the game */

	/*----------------- never reached -----------------------------------------
	 *
	 * Following code is here to show how to restore the original timer vector
	 */
	 
	*(p.b + IRQM) = 0;		/* remove the TIMER interrupt */

	/*
	 * TIMER is bit position 1 in FIQ (vecnum = FIQbitvector+bit1 = 0x20 + 1)
	 */

    if (ARMInstallIRQHandler(1,prev_hand) == NULL)
     {
      SWI_Write0("\nError: Unable to reinstall handler.\n") ;
     }
	
	*(p.b + IRQM) = TimerIT;	/* restart the TIMER interrupt */
}
/******************************************************************************
 *
 * T i m e r _ I R Q
 *
 * ENTER:	void
 * EXIT:	void
 *
 * Timer interrupt routine
 */
void	Timer_IRQ( void )
{
 union gp	{
			unsigned char	*b;
			unsigned int	*w;
			} p;
 
	p.b = (unsigned char *) IOBase;

	*(p.b + IRQRST) = TimerIT;		/* reset Timer interrupt */

	OSTimeTick();		/* do uC/OS tick routine */
}

/*---------------------------------------------------------------------------*/
/*> EOF example3.c <*/