#include <iom16v.h>
#include <macros.h>
#define  uchar unsigned char
#define  uint  unsigned int
#define RS PA4
#define RW PA5
#define EN PA6
void init(void);
void write_com(uchar com);
void write_dat(uchar dat);
void delay_ms(uint q); 
void message(uchar *p);
void left(void);
uchar table1[]="AD CONVERTER";
uchar table2[]="V=  .       ";
int ada,num1,qian,bai,shi,ge;
float num;
uint mega16_ad()
{
     uint addata;
	 ADMUX=0;
	 ADCSR=0X80;
	 ADCSR|=BIT(ADSC);
	 while(!(ADCSR&(BIT(ADIF))));
     addata=ADCL;
	 addata=addata+ADCH*256;
	 return addata;
}   

void main()
{
   	DDRA|=0x70;
	DDRB=0xff;
	init();
	DDRA&=~BIT(PA0);
	PORTA&=~BIT(PA0);
    while(1)
    {
	  message(table1);
	  write_com(0x80+0x42);
      ada=mega16_ad();
	  num=(((float)ada)/1024)*5;
	  num1=(int)(num*1000);
	  qian=num1/1000;
	  bai=num1%1000/100;
	  shi=num1%1000%100/10;
	  ge=num1%10;
	  table2[3]=qian+48;
	  table2[5]=bai+48;
	  table2[6]=shi+48;
	  table2[7]=ge+48;
	  message(table2);
	  write_com(0x80+0x03+0x10);
    }
}
void left(void)
{
	uchar j;
	for(j=0;j<16;j++)
	{
		write_com(0x18);
		delay_ms(5);
	}
}
void message(uchar *p)
{
	while(1)
	{
		if(*p=='\0') break;
		write_dat(*p);
		delay_ms(5);
		p++;
	}
}
void init(void)
{
	PORTA&=~BIT(5);//RW=0;
	PORTA&=~BIT(6);//EN=0;
	write_com(0x38);
	write_com(0x01);
	write_com(0x0c);
	write_com(0x06);
	write_com(0x80+0x02);
}
void write_com(uchar com)
{
	PORTA&=~BIT(4);//RS=0;
	PORTB=com;
	delay_ms(5);
	PORTA|=BIT(6);//EN=1;
	delay_ms(5);
	PORTA&=~BIT(6);//EN=0;
}
void write_dat(uchar dat)
{
	PORTA|=BIT(4);//RS=1;
	PORTB=dat;
	delay_ms(5);
	PORTA|=BIT(6);//EN=1;
	delay_ms(5);
	PORTA&=~BIT(6);//EN=0;
}
void delay_ms(uint q) 
{ 
 unsigned int m,n;
 for(m=q;q--;q>0) 
 for(n=(4*143-2);n>0;n--); 
}