#include <iom16v.h>
#include <macros.h>
#include <math.h>
#define uchar unsigned char
#define uint unsigned int
#define LCD_EN         BIT(PC3)
#define LCD_RS         BIT(PC2)

uchar title[]={"hello!"};
uchar title1[]={"key:"};

uchar key_flag;
unsigned  data_temp;
uchar xians[]="0123456789";

  
void delay(unsigned int i)
{
    unsigned int a, b;
    for (a = 1; a < i; a++)
    {
        for (b = 1; b<2000; b++);
    }
}
void write_com(uchar com)
{
       PORTD&=~BIT(3);
       PORTD&=~BIT(4);
       PORTB=com;
       PORTD|=BIT(6);
       delay(3);
       PORTD&=~BIT(6);
}
void write_dat(uchar dat)
{     
       PORTD|=BIT(3);
       PORTD&=~BIT(4);
       PORTB=dat;
       PORTD|=BIT(6);
       delay(3);
       PORTD&=~BIT(6);
}
void Uart_Init(void)
 { UCSRA = 0x02;  
  UCSRB = 0x18;  
  UCSRC = 0x06;  
  UBRRH = 0x00;
  UBRRL = 12;  
  }


void Uart_Transmit(unsigned char i)
{ while (!(UCSRA & (1<<UDRE)));  
 UDR = i;  
 }

uint mega16_ad()
{
    uint addata;
    DDRA&=~BIT(PA0);
    PORTA&=~BIT(PA0);
   
    ADMUX=0xC0;
    ADCSRA=0X80;
   
    ADCSRA|=BIT(ADSC);
    while(!(ADCSRA&(BIT(ADIF))));
   
   
    addata=ADCL;
    addata=addata+ADCH*256;
    return addata;
}

int main(void)

{   
 uint ad;
 float adc0;
    uchar k,j,k1,k2,k3;
   
   DDRD = 0x22;
     PORTD = 0xFF;
     
    Uart_Init();
    while(1)
    {
        ad=mega16_ad();
        adc0=ad*5.0/1024;
        k1=(int)adc0;
        k2=(int)((adc0-k1)*10);
        k3=(int)((adc0-k1-k2*0.1)*100);
      DDRB=0XFF;
      DDRD|=BIT(3)|BIT(4)|BIT(6);
      PORTD&=~BIT(6);
      write_com(0X38);
      delay(9);
      write_com(0X01);
      delay(9);
      write_com(0X0C);
      delay(9);
      write_com(0X06);
      delay(9);
      if (k1>=4)
        PORTD&=~BIT(5);
        
        else
         PORTD|=BIT(5);
 
      while(1)
     {
       write_com(0X80+0X00);
       delay(5);
       write_dat(xians[k1]);
       delay(5);
        write_dat(0x2e);
       delay(5);
        write_dat(xians[k2]);
       delay(5);
       write_dat(xians[k3]);
       delay(5);
       write_dat('V');
       delay(5);
       Uart_Transmit(xians[k1]);
       Uart_Transmit(0x2e);
       Uart_Transmit(xians[k2]);
       Uart_Transmit(xians[k3]);
       Uart_Transmit('V');
       delay(2);
    }
    return 0;}
}