main.c

LED渐变演示程序

#include <avr/io.h> 
#include <util/delay.h> 

#define uchar unsigned char 
#define uint unsigned int 
  
int main () 
 { uchar pwm=0x00; 
    
   TCCR1A=0xb1; 
   TCCR1B=0x09; 
   TCNT1=0; 
   DDRB|=0xf6; 
   PORTB|=0xf6; 
    
   while (1) 
    { for (pwm=0;pwm<255;pwm++) 
           { _delay_loop_2 (2000); 
             OCR1A=pwm; 
             OCR1B=pwm; 
           } 
          for (pwm=255;pwm>0;pwm--) 
           { _delay_loop_2 (2000); 
             OCR1A=pwm; 
             OCR1B=pwm; 
           } 
    }
 
  }