c代码
/*****************************************************
This program was produced by the
CodeWizardAVR V2.05.5a Evaluation
Automatic Program Generator
?Copyright 1998-2011 Pavel Haiduc, HP InfoTech s.r.l.
http://www.hpinfotech.com

Project : 
Version : 
Date    : 2012/1/9
Author  : Freeware, for evaluation and
non-commercial use only
Company : 
Comments: 


Chip type               : ATmega16
Program type            : Application
AVR Core Clock frequency: 4.000000 MHz
Memory model            : Small
External RAM size       : 0
Data Stack size         : 256
*****************************************************/

#include <mega16.h>

flash unsigned char  led_7[10] = {0x3F,0x06,0x5B,0x4f,0x66,0x6D,0x7D,0x07,0x7F,0x6F}  ;
flash unsigned char position[4] = {0xfe,0xfd,0xfb,0xf7};

unsigned char dis_buff[4]={0,0,0,},posit;
bit time_2ms_ok ;

void adc_to_disbuffer(unsigned int adc)
{
  unsigned char i;
  for (i=0;i<=3; i++)
  {
    dis_buff[i] = adc %10;
    adc /= 10;
  }
}

interrupt[TIM0_COMP] void timer0_comp_isr(void)
{
  time_2ms_ok = 1;
}

interrupt[ADC_INT] void adc_isr(void)
{
  unsigned int adc_data,adc_v;
  adc_data = ADCW ;
  adc_v = (unsigned long) adc_data * 5000/1024 ;
  adc_to_disbuffer(adc_v);
}

void display(void)
{
  PORTA |= 0x0f;
  PORTC = led_7[dis_buff[posit]];
  if(posit== 3) PORTC |= 0x80;
  PORTA &= position[posit];
  if(++posit >= 4) posit = 0;
}



void main(void)
{
 DDRA = 0x0f;
 PORTA = 0x0F;
 DDRC = 0xff;
 PORTC = 0x00;
 
 TCCR0 = 0x0B;
 TCNT0 = 0x00;
 OCR0 = 0x7c;
 TIMSK = 0x02;
 
 ADMUX = 0x47;
 SFIOR &= 0x1F;
 SFIOR |=0x60;
 ADCSRA = 0xAD;
 
 #asm("sei")
            
 

while (1)
{
  if(time_2ms_ok)
  {
    display();
    time_2ms_ok = 0;
  }

}
}