key_pwm.c

ATMEGA8-keyboard-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 delay(unsigned int time)	//延时子函数
{
while(time)time--;
   }

int main (void)
{
    DDRB=0xff;
	PORTB=0Xff;//1111,1111
	DDRD=0x00;
	PORTD=0Xff;//1111,1111
OCR1B=0x00ff;
OCR1A=0x007f;

	 TCCR1A=0Xf2;
	 TCCR1B=0x19;
     TCNT1=0;
ICR1=0x00ff;
////////////////////////2通道PWM
TCCR2|=1<<WGM20|1<<WGM21|1<<COM21|1<<COM20|1<<CS20;
OCR2=0xff;
//////////////////////////
while(1)
	{
   if((PIND&0x20)==0)  
      {
	  OCR1B=0;
	  }
   if((PIND&0x10)==0)
      {
	  OCR1B=0x0040;
	  }
   if((PIND&0x08)==0)  
      {
	  OCR1B=0x0080;
	  }
   if((PIND&0x04)==0)
      {
	  OCR1B=0x00a0;
	  }

delay(600);
OCR2=0x00;
delay(600);
OCR2=0x7f;
delay(600);
OCR2=0x00;
delay(600);
OCR2=0xff;
delay(600);
	}
	return (0); 
}