led display 0 – 9 with switch

[eshwar]

#include <REGX51.H>

 

 

sfr  ldata =0x90;

sbit rs = P2^0;

sbit rw = P2^1;

sbit  e = P2^2;

sbit sw = P2^3;

sbit led= P3^0;

void delay(int x)

{int i;

for( i = 0; i<10;i++)

{

for(x = 0; x<1250; x ++);

}

}

 

void lcdcmd(unsigned char x)

{

ldata = x;

rs = 0;

rw = 0;

e = 1;

delay(10);

e = 0;

}

 

void lcddata(unsigned char y)

{

ldata = y;

rs = 1;

rw = 0;

e = 1;

delay(10);

e = 0;

}

 

void init_lcd()

{

}

 

void main()

{

char i[10] = "0123456789";

 

char k;

 

 

lcdcmd(0x38);

lcdcmd(0x06);

lcdcmd(0x0E);

lcdcmd(0x01);

lcdcmd(0x80);

delay(100);

if(sw==0)

{

led = 0;

for( k =0; k<10;k++)

{

delay(100);

lcddata(i[k]);

delay(100);

lcdcmd(0x01);

delay(100);

 

}

led = 1;

}

 

}

 

 

 

 

 

 

 

 

[GANEEV SINGH]

Hi

I find a little problem in this code.

The code will show nothing on LCD screen if the switch is not pressed at all. According to me, "If(sw==0){}" condition should be written under "while(1)" loop so that it keeps on checking the switch status and displays 0-9 whenever switch gets pressed.

[Author]

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