//   問題采直流是總是閃爍，顯示有問題，改了幾次都不怎么成功//
//********************時間 11.8號修改**************************************//顯示有缺陷
#include<iom16v.h>
#include <macros.h>
 float AD[180];

unsigned int b;
float cc,ad,max;

unsigned char flag2,k=0;
unsigned char flag1=0;
unsigned char time0;
unsigned char led_buff[4]={0,0,0,0};
unsigned char table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,
   0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};

 void delay(unsigned int t )
  {  unsigned int i;
    for(i=0;i<t;i++)
      {;;}
   }
   void delay_nus(int time)
	 {     
  	   do
	  	 {
		 time--;
		  }	
  	  while (time>1);
	 }	  
/*	  		    毫秒級延時程序			*/	 
void delay_nms(unsigned int time)
	 {
	  while(time!=0)
	  	  {		
		   delay_nus(1000);
		   time--;
		  }
	 }	


void time_init()
   {
     TCCR0=0;
	 SREG=0X80;
	 TIMSK=0x01;//溢出中斷允許
     ASSR=0;
     TCNT0=200;
     TCCR0=0x02;//系統時鐘8分頻             
   }
#pragma interrupt_handler time0_yichu:10
   void time0_yichu()
       {
          TCNT0=200;
          time0=1;
          flag1=1;	
        }
 
void initial_ADC( void)
    { 
      ADCSRA = 0x00;
       SREG=0X80;     //開中斷
       ADMUX=0X40;   //AVCC，AREF為5V電壓，0通道
       ADCSRA=0XCE;//64分頻,開AD使能,啟動ADSC,表示開始轉換,開中斷使能                   
	   flag1=0;
					
     }
/*************************************/ 
 #pragma interrupt_handler  ADC16:15
   void ADC16(void)
   {  
      ad=(float)ADC*500/1024;
      AD[k]=ad;
      flag2=1;
    }
void caidi()
  {
    unsigned char i;
    for(i=0;i<180;i++)
       {
          time_init();
          while(flag1==0) ;
          initial_ADC();
          while(flag2!=1) ;
          k++;
		  flag2=0;
		
        }
     }

 void display(void)
	 {
	  unsigned char i;
	  DDRB=0xff;
	  PORTB=0xff;
	  DDRD|=0xf0;//PD2，PD3分別為外部中斷0和1；
	  PORTD|=0xf0;
	  for(i=0;i<4;i++)
	  	 {		  
		  PORTB=led_buff[i];
		  PORTD&=~(1<<(i+4));//注意位運算符&,不是|
		  delay_nms(1);
		  PORTD|=0xf0;//每掃描一位,全部置高
		  }
        }
 void maxtoBCD(void)
 {  
  unsigned char i;
  for(i=0;i<4;i++)
 { 
  led_buff[i]=table[(int)max%10];
     max=(int)max/10; 
   }
       
   }
		 
 void zuida()
   {
      unsigned char i;
      
	   max=AD[0];
	for(i=0;i<180;i++)
	  {
	    if(AD[i]>max)max=AD[i];
		else
		   i++;
      }
  }
void main() 
  { 
        
    while(1)
      {caidi();
		 delay_nus(1000);
        zuida();
		 delay_nms(10);
	     maxtoBCD();
		 delay_nus(100);
	   display();
        }
   }