4bit lcd program for 2148…..i am getting perfectly output in kiel but in proteus nothing is displaying on lcd..can you tell me

[ANJUSHA]

#include <LPC21xx.H>
void delay(int count ) ;
void lcddata(int c);
void lcdcmd(int t);

void delay(int count)
        {
        int j=0, i=0;
        for (j=0;j<count;j++)
        for (i=0;i<250;i++);
        }

 

void lcdcmd(int t)
{
 
int s=0;
s=(t>>4) & 0x0f;
s=s << 16;
 
IO1CLR=0x10000000; // rs =1 p1.28
IO1CLR=0x20000000; // rw =0 p1.29
IO1SET=0x40000000;

IO1CLR=0X000F0000;
IO1SET = s;
delay(1000);
IO1CLR=0x40000000; //en=0 p1.30
 
s = t & 0x0f;
s=s<<16;

IO1CLR=0x10000000; // rs =1 p1.28
IO1CLR=0x20000000; // rw =0 p1.29
IO1SET=0x40000000;

IO1CLR=0X000F0000;
IO1SET = s;
delay(1000);
IO1CLR=0x40000000; //en=0 p1.30
}

void lcddata(int c)
{
int d=0;
d=((c>>4) & 0x0f);
d= d<<16;
 
IO1SET=0x10000000; // rs =1 p1.28
IO1CLR=0x20000000; // rw =0 p1.29
IO1SET=0x40000000;

IO1CLR=0X000F0000;
IO1SET = d;
delay(1000);
IO1CLR=0x40000000; //en=0 p1.30
 
d= c & 0x0f;
d=d<<16;

IO1SET=0x10000000; // rs =1 p1.28
IO1CLR=0x20000000; // rw =0 p1.29
IO1SET=0x40000000;

IO1CLR=0X000F0000;
IO1SET = d;
delay(1000);
IO1CLR=0x40000000; //en=0 p1.30
}

void msgdisplay(unsigned char k[])
{
int i;
for(i=0; k!=’’; i++)
{
lcddata(k);
delay(1000);
}
}

int main( )
{
IO1DIR=0X700f0000;
delay(100);

lcdcmd(0x02);
lcdcmd(0x28);
lcdcmd(0x01);
lcdcmd(0x06);
lcdcmd(0x0E);

while(1)
{
lcdcmd(0x80);
msgdisplay(“INFORMATION”);
delay(1000);
lcdcmd(0xc0);
msgdisplay(“lab”);
delay(1000);
}

}

[AJISH ALFRED]

Hi Abiram,

“i am getting perfectly output in kiel”.

KEIL is an IDE used for compiling code, sometimes burning the code and simulate the microcontroller registers. I can’t understand what exactly you mean by ‘getting perfect output on kiel’. Please clarify it and tell us more details about your project so that we can help you better.

[ANJUSHA]

#include <LPC21xx.H>
void delay(int count ) ;
void lcddata(int c);
void lcdcmd(int t);

void delay(int count)
        {
        int j=0, i=0;
        for (j=0;j<count;j++)
        for (i=0;i<250;i++);
        }

void lcdcmd(int t)
{
 
int s=0;
s=(t>>4) & 0x0f;
s=s << 16;
 
IO0CLR=0x10000000;    // rs =0 p0.28
IO0CLR=0x20000000;    // rw =0 p0.29
IO0SET=0x40000000;

IO1CLR=0X000F0000;
IO1SET = s;
delay(1000);
IO0CLR=0x40000000; //en=0 p0.30
 
s = t & 0x0f;
s=s<<16;

IO0CLR=0x10000000;    // rs =1 p0.28
IO0CLR=0x20000000;    // rw =0 p0.29
IO0SET=0x40000000;

IO1CLR=0X000F0000;
IO1SET = s;
delay(1000);
IO0CLR=0x40000000; //en=0 p0.30
}

void lcddata(int c)
{
int d=0;
d=((c>>4) & 0x0f);
d= d<<16;
 
IO0SET=0x10000000;    // rs =1 p0.28
IO0CLR=0x20000000;    // rw =0 p0.29
IO0SET=0x40000000;

IO1CLR=0X000F0000;
IO1SET = d;
delay(1000);
IO0CLR=0x40000000; //en=0 p0.30
 
d= c & 0x0f;
d=d<<16;

IO0SET=0x10000000;    // rs =1 p0.28
IO0CLR=0x20000000;    // rw =0 p0.29
IO0SET=0x40000000;

IO1CLR=0X000F0000;
IO1SET = d;
delay(1000);
IO0CLR=0x40000000; //en=0 p0.30
}

void msgdisplay(unsigned char k[])
{
int i;
for(i=0; k!=’’; i++)
{
lcddata(k);
delay(1000);
}
}

int main( )
{
PINSEL1=0X00000000;
PINSEL2=0X00000000;
IO0DIR=0X70000000;
IO1DIR=0X000f0000;
delay(100);

lcdcmd(0x02);
lcdcmd(0x28);
lcdcmd(0x0c);
lcdcmd(0x06);
lcdcmd(0x01);

 

while(1)
{

msgdisplay(“INFORMATION”);
delay(1000);
//lcdcmd(0xc0);
//msgdisplay(“HYDERABAD”);
//delay(1000);
}

}

[ANJUSHA]

[ANJUSHA]

hello sir

      i  included the code i written for 4-bit lcd…i mean to say that i can observe ,whethet that pin is getting data as per program,on peripheral window of port0 and port 1..and again i tested using proteus….choosing microcontroller and 16×2 lcd..output is not getting.just lcd contrast light is glowing.no cursor blinking….sir can u check whether initial commanda for 4_bit lcd are correct? and solve this problem sir…i wi be thankful to you.

[AJISH ALFRED]

Hi,

The initial commands for the 4 bit interfacoing should be something like the following; don’t forget to add some delay after all the commands.

 

    lcd_cmd ( 0x02 ); // to initialize LCD in 4-bit mode.
    lcd_cmd ( 0x28 ); //to initialize LCD in 2 lines, 5X7 dots and 4bit mode.
    lcd_cmd ( 0x0C );
    lcd_cmd ( 0x06 );
    lcd_cmd ( 0x80 );
    lcd_cmd ( 0x01 );
    delay_ms ( 500 );

 

Check your circuit connections also, use a variable resistor with the contrast pin of the LCD to adjust the contrast and also use a resistance in series with 15 th or 16 th pin to adjust the backlight.

 

Suggest you to leave the simulating software and try it on the real hardware, because one day you have to do the project in the hardware and then you will find that you were actually wasting your time with the simulating softwares.

[ANJUSHA]

thank you sir.

[Author]

Posts