Embed4u

8051 2 DIGIT CALCULATOR C PROGRAM:

#include<reg51.h>

#include<reg51.h>

#include<string.h>

#include<stdio.h>

sbit rs   = P2^5;

sbit en   = P2^6;

unsigned char val[] = {’0′,’1′,’2′,’3′,’4′,’5′,’6′,’7′,’8′,’9′,’+',’-'};

unsigned char co=0,co1=0;

unsigned int result,kc=0,ki=0,kk=0,kj=0;

void delay()

{

int i = 00,j;

for(i = 0;i < 175;i++)

for(j=0;j<498;j++);

}

void lcd_comm()

{

rs   = 0;

}

void lcd_en ()

{

en  = 1;

en  = 0;

}

void delay_lcd ()

{

int i = 00,j;

for(i = 0;i < 15;i++)

for(j=0;j<498;j++);

}

void timer_delay(int z)

{

int i;

for(i=0;i<z;i++)

{

TMOD=0×10;//1 sec delay

TH1=0×01;

TL1=0×08;

TR1=0;

while(TF1==0);

TF1=0;

TR1=0;

}

}

void init_lcd()

{

lcd_comm();

P0     = 0×38;

lcd_en ();

delay_lcd ();

lcd_comm();

P0      = 0×0c;

lcd_en ();

delay_lcd ();

lcd_comm();

P0       = 0×01;

lcd_en ();

delay_lcd ();

lcd_comm();

P0       = 0×06;

lcd_en ();

delay_lcd ();

lcd_comm();

P0 = 0×81;

lcd_en ();

delay_lcd ();

}

void disp(unsigned char n)

{

rs=1;

P0=val[n/100];

printf(”%d”, n);

// n=n/10;

lcd_en();

lcd_en();

delay_lcd ();

P0=val[(n/10)%10];

lcd_en();

lcd_en();

delay_lcd ();

P0=val[n%10];

lcd_en();

lcd_en();

delay_lcd ();

}

void display(char *name)

{

int l,i;

l=strlen(name);

for(i=0;i<l;i++)

{

rs=1;

//  delay_lcd ();

P0=name[i];

lcd_en();

delay();

}

}

/******************************************************************************************

Keyboard Routine

******************************************************************************************/

unsigned char kb()

{

unsigned char li=0,lj=0xee,lk,lr=45;

for(li=0;li<4;li++)

{

P1=lj;

// delay();

lk=P3;

delay_lcd ();

lk &= 0×38;

if(lk!=0×38)

{

if(lk==0×30)

lr=0+(li*3);

if(lk==0×28)

lr=1+(li*3);

if(lk==0×18)

lr=2+(li*3);

}

lj = (lj<<1)+1;

}

return(lr);

}

//******************************************************************************************//

/*Main Function Routine*/

//******************************************************************************************//

void main()

{

init_lcd();

result = 45;

while(1)

{

result = kb();

if(result!=45)

{

if(result == 10 && co ==2)

{

// kk = ki + kj;

co1=1;  

co = 3;

display(”+”);

}

else if(result == 11 && co ==2)

{

// kk = ki – kj;    

co = 3;

co1 = 2;

display(”-”);

}

else if(result>=0 && result<10)

{

if(co==0)

{

init_lcd();

ki = result;

disp(ki);

co++;

//result = 0;

}

else if(co==1)

{

init_lcd();

ki = (ki*10) + result;

disp(ki);

co++;

//result = 0;

}

else if(co==3)

{

lcd_comm();

P0      = 0×87;

lcd_en ();

delay_lcd ();

kj = result;

disp(kj);

co++;

//result = 0;

}

else if(co==4)

{

lcd_comm();

P0      = 0×87;

lcd_en ();

delay_lcd ();

kj = (kj*10) + result;

disp(kj);

co++;

kc=99;

//result = 0;

}

else

{

init_lcd();

display(”VALUE OVERLOADED”);

ki = kj=kk=0;

co=0;

}

}

delay();

delay();

}

else

{

kc++;

}

if(kc==100)

{

if(co1==1)

{

kk = ki + kj;

lcd_comm();

P0      = 0xc2;

lcd_en ();

delay_lcd ();

disp(kk);

ki=0,kk=0,kj=0,co=0,co1=0,kc=0;

}

else if(co1==2)

{

kk = ki – kj;

lcd_comm();

P0      = 0xc2;

lcd_en ();

delay_lcd ();

disp(kk);

ki=0,kk=0,kj=0,co=0,co1=0,kc=0;

}

}

}

}

//*******************************************End of Main Program******************************************//