Embed4u

#include<reg51.h>

#include<string.h>

sbit rs   = P2^5;

sbit en   = P2^6;

unsigned char val[] = {’1′,’2′,’3′,’4′,’5′,’6′,’7′,’8′,’9′,’#',’0′,’*',

‘a’,'d’,'g’,'j’,'m’,'p’,’s’,'v’,'y’,'%’,'{’,’[',

'b','e','h','k','n','q','t','w','z','!','}',']‘,

‘c’,'f’,'i’,'l’,'o’,'r’,'u’,'x’,'$’,'_’,'+’,'/’};

void delay()

{

unsigned char i;

for(i = 0;i < 150;i++)

{}

}

void lcd_comm()

{

rs   = 0;

}

void lcd_en ()

{

en  = 1;

en  = 0;

}

void delay_lcd ()

{

int i = 00,j;

for(i = 0;i < 175;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];

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_lcd ();

}

}

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

//                     Keyboard Routine

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

unsigned char kb()

{

unsigned char i=0,j=0xee,k,r=45;

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

{

P1=j;

// delay();

k=P3;

k &= 0×38;

if(k!=0×38)

{

if(k==0×30)

r=0+(i*3);

if(k==0×28)

r=1+(i*3);

if(k==0×18)

r=2+(i*3);

}

j = (j<<1)+1;

}

return(r);

}

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

/*Main Function Routine*/

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

void main()

{

unsigned char result,i=0,kk,j=255;

while(1)

{

init_lcd();

result = kb();

if(result!=45)

{

if(result == kk)

{

kk = result;

result=result+(i*12);

i++;

}

else

{

j=255;

i=0;

kk = result;

}

disp(result);

}

j–;

if(j==0 && i>3)

{

j=255;

i=0;

kk = 89;

}

}

}

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

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