单片机源程序如下:

#include "includes.h"

#define F_OSC 8000000 /* Crystal frequence 10Mhz*/

#define LED_ON() { DDRF = 0xff; PORTF = 0x0; }

#define LED_OFF() ( PORTF = 0xff )

/* ***********************************

* TimerInit()

* Fun: Initial the system timer for os, using timer 0

* ************************************ */

void TimerInit( void )

{

TCCR2 = 1<<3; /* work in CTC mode */

OCR2 = 98; /* 100 hz */

TCNT2 = 0;

TIMSK |= 1<<7; /* Enable CTC interrupt */

TCCR2 |= 3; /* start timer, F_OSC/1024 */

}

OS_EVENT * mbox;

OS_STK stk0[80], stk1[80];

void task0( void * pdata )

{

INT8U error;

while(1)

{

OSMboxPend( mbox, 0, &error );

LED_ON();

OSTimeDly(400);

OSMboxPost( mbox, (void *)1 );

}

}

void task1( void * pdata )

{

INT8U error;

TimerInit();

while(1)

{

OSMboxPend( mbox, 0, &error );

LED_OFF();

OSTimeDly(400);

OSMboxPost( mbox, (void *)1 );

}

}

int main()

{

INT8U error;

OSInit();

mbox = OSMboxCreate( (void *)1 );

OSTaskCreate( task0, (void *)0, &stk0[99], 2 );

OSTaskCreate( task1, (void *)0, &stk1[99], 3 );

OSStart();

return 0;

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