pwm_study.c

ATMEGA8-pwm-学习AVR的朋友们挺多的

#include <avr/io.h>



#define sbi(x,y) (x|=(1<<y))
#define cbi(x,y)  (x&=~(1<<y))
#define uchar unsigned char
#define uint unsigned int


void waitms (unsigned int time)	//延时子函数
{
while(time)time--;
   }

int main (void)
{
    DDRB=0xff;
	PORTB=0Xff;//1111,1111
	DDRB=0x00;
	PORTB=0Xff;//1111,1111
OCR1B=0x00ff;
OCR1A=0x00ff;

	 TCCR1A=0Xf2;
	 TCCR1B=0x19;
     TCNT1=0;
ICR1=0x00ff;
while(1)
	{
	
	 if(OCR1B>=0x00ff)
	    {
		OCR1B=0;
		}
		OCR1B++;
     waitms(15000);


	}
	return (0); 
}