/*****************************************************
Project : Generating sawtooth waveform
Author : Reza Sepas Yar
Email : info@avr.ir
Chip type : ATmega16
Clock frequency : 4.000000 MHz
*****************************************************/
#include <mega16.h>
#include <delay.h>
char i=0;
interrupt [TIM1_COMPA] void timer1_compa_isr(void)
{
OCR1A=i;
i++;
if(i==255)
i=0;
//delay_ms(1000);
}
void main(void) {
DDRD=0xFF;
// Timer/Counter 1 initialization
// Clock source: System Clock
// Clock value: 8000.000 kHz
// Mode: Fast PWM top=00FFh
// OC1A output: Non-Inv.
// OC1B output: Discon.
// Noise Canceler: Off
// Input Capture on Falling Edge
TCCR1A=0x81;
TCCR1B=0x09;
TCNT1H=0x00;
TCNT1L=0x00;
ICR1H=0x00;
ICR1L=0x00;
OCR1AH=0x00;
OCR1AL=0x00;
OCR1BH=0x00;
OCR1BL=0x00;
// Timer(s)/Counter(s) Interrupt(s) initialization
TIMSK=0x10;
//enable global interrups
#asm("sei");
while (1);
}
دیدگاه