main.c

利用定时器发送定制脉冲信号！ 应用使用的是ATMEL Mega48.

//ICC-AVR application builder : 2008-4-27 16:46:06
// Target : m48
// Crystal: 8.0000Mhz

#include <iom48v.h>
#include <macros.h>

void port_init(void)
{
 PORTB = 0x00;
 DDRB  = 0x02;
 PORTC = 0x00; //m103 output only
 DDRC  = 0x01;
 PORTD = 0x00;
 DDRD  = 0x00;
}

void timer1_init(void)
{
 TCCR1B = 0x00; //stop
 TCNT1H = 0xFC; //setup
 TCNT1L = 0xA3;
 OCR1AH = 0x03;
 OCR1AL = 0x5D;
 OCR1BH = 0x03;
 OCR1BL = 0x5D;
 ICR1H  = 0x03;
 ICR1L  = 0x5D;
 TCCR1A = 0x40;
 TCCR1B = 0x0B; //start Timer
}

//call this routine to initialize all peripherals
void init_devices(void)
{
 //stop errant interrupts until set up
 CLI(); //disable all interrupts
 port_init();
 timer1_init();

 MCUCR = 0x00;
 EICRA = 0x00; //extended ext ints
 EIMSK = 0x00;
 
 TIMSK0 = 0x00; //timer 0 interrupt sources
 TIMSK1 = 0x00; //timer 1 interrupt sources
 TIMSK2 = 0x00; //timer 2 interrupt sources
 
 PCMSK0 = 0x00; //pin change mask 0 
 PCMSK1 = 0x00; //pin change mask 1 
 PCMSK2 = 0x00; //pin change mask 2
 PCICR = 0x00; //pin change enable 
 PRR = 0x00; //power controller
 SEI(); //re-enable interrupts
 //all peripherals are now initialized
}

void main(void)
{
//	static unsigned char cChg = 1;
	init_devices();
 	while(1)
	{
		if( (PINB & (0x01<<0)) == 0x00 )
		{
			 TCCR1A = 0x00;	
		}
		else
		{
			 TCCR1A = 0x40;
		}
	 }
}