Write a C program to display the code of the key pressed in 8051

#include <REG51xD2.H>

#include "lcd.h"

unsigned char getkey();

void delay(unsigned int);

main()

{

unsigned char key;

InitLcd(); /* Initialise LCD */

WriteString("Key Pressed="); /* Display msg on LCD */

while(1)

{

GotoXY(12,0); /* Set Cursor Position */

key = getkey(); /* Call Getkey method */

}

}

unsigned char getkey()

{

unsigned char i,j,k,indx,t;

P0=0x0ff;

P1=0x0ff;

P2 = 0x00; /* P2 as Output port */

indx = 0x00; /* Index for storing the first value of

scanline */

for(i=0x00E;i>=0x00B;i<<=1) /* for 4 scanlines */

{

P2 = i; /* write data to scanline */

t = P0; /* Read readlines connected to P0*/

t = ~t;

if(t>0) /* If key press is true */

{

delay(6000); /* Delay for bouncing */

for(j=0;j<=7;j++) /* Check for 8 lines */

{

t >>=1;

if(t==0) /* if get pressed key*/

{

k = indx+j; /* Display that by converting to Ascii */

t = k>>4;

t +=0x30;

WriteChar(t); /* Write upper nibble */

t = k & 0x0f;

if(t > 9)

t+=0x37;

else

t+=0x30;

WriteChar(t); /* write lower nibble */

return(indx+j); /* Return index of the key pressed */

}

}

}

indx += 8; /* If no key pressed increment index */

}

}

void delay(unsigned int x) /* Delay routine */

{

for(;x>0;x--);

}