timers.c.bak

这是我在网上找到一个关于AVRX嵌入式操作系统在ATMAGE103上移植的例程,现在拿出来跟大学分享,希望大学喜欢呀!

/*
	Example code for setting up and using timers

	Two tasks each waiting on a timer, flashing LED's on
	the evaluation board.  See "hardware.h" for LED definitions

    The kernel Stack is defined by the IAR linker file, or Top or SRAM
    in GCC (can be altered in the GCC link files, or defined symbol)
*/
//#define _SFR_ASM_COMPAT 1
#include <avr\io.h>
#include <avr\signal.h>
#include "avrx.h"
#include "serialio.h"       // From AvrX...
#include "hardware.h"

AVRX_GCC_TASK(Monitor, 10, 0);          // External Task: Debug Monitor

TimerControlBlock   timer1,             // Declare the control blocks needed for timers
                    timer2;
/*
 Timer 0 Overflow Interrupt Handler

 Prototypical Interrupt handler:
 . Switch to kernel context
 . handle interrupt
 . switch back to interrupted context.
 */


AVRX_SIGINT(SIG_OVERFLOW0)
{
    IntProlog();                // Switch to kernel stack/context
//    TCNT0 = TCNT0_INIT;
    TCNT0 = TCNT0_INIT;
    AvrXTimerHandler();         // Call Time queue manager
    Epilog();                   // Return to tasks
}

/*
 Task 1 simply flashes the light off for 1/5 second and then on for 4/5th
 for a 1 second cycle time.
 */
AVRX_GCC_TASKDEF(task1, 6, 3)
{
    while (1)
    {
        AvrXStartTimer(&timer1, 800);       // 800 ms delay
        AvrXWaitTimer(&timer1);
        LED = LED ^ 0x01;
        AvrXStartTimer(&timer1, 200);       // 200 ms delay
        AvrXWaitTimer(&timer1);
        LED = LED ^ 0x01;
    }
}
/*
 Task 2 cycles the light on/off over 4 seconds.  It uses a simplified
 form of the delay API
 */
AVRX_GCC_TASKDEF(task2, 6, 2)
{
    while (1)
    {
        AvrXDelay(&timer2, 2000);           // 2 second delay
        LED = LED ^ 0x02;
    }
}

int main(void)                 // Main runs under the AvrX Stack
{
//#define JUST_TOGGLE_PB0
#if defined(JUST_TOGGLE_PB0)
	int i;
    LEDDDR = 0xFF;
    LED   = 0xFF;

	UBRR0L = UBRR_INIT;
	UBRR0H = 0;
//	UCSR0A = ; 
	UCSR0B = _BV(TXEN0);
	UCSR0C = _BV(URSEL0) | _BV(UCSZ01) | _BV(UCSZ00);
	TCNT0 = TCNT0_INIT;
	TCCR0 = TMC8_CK256;
	while (1)
		{
		UDR0 = '+';
		LED &= ~_BV(0);		// LED on
		for (i = 750; i > 0; i--)
			{
			while (0 == (TIFR & _BV(TOV0)))
				;
			TIFR |= _BV(TOV0);
			TCNT0 = TCNT0_INIT;
			}
		UDR0 = '-';
		LED |= _BV(0);			// LED off
		for (i = 250; i > 0; i--)
			{
			while (0 == (TIFR & _BV(TOV0)))
				;
			TIFR |= _BV(TOV0);
			TCNT0 = TCNT0_INIT;
			}
		}
#else
    AvrXSetKernelStack(0);
    MCUCR = 1<<SE;
    TCNT0 = TCNT0_INIT;
    TCCR0 = TMC8_CK256;
    TIMSK = 1<<TOIE0;

    LEDDDR = 0xFF;
    LED   = 0xFF;

    AvrXRunTask(TCB(task1));
    AvrXRunTask(TCB(task2));
    AvrXRunTask(TCB(Monitor));

    InitSerialIO(UBRR_INIT);    // Initialize USART baud rate generator
	
    Epilog();                   // Switch from AvrX Stack to first task
#endif 	// defined(JUST_TOGGLE_PB0)
    return(0);
}