Hi,
I am new to microcontroller programming...I would like to interface a LCD with Pic 16f877.. but i think that there is a problem in initializing the LCD...I could not able to initialize the LCD...LCD just displays black boxes...
Compiler:MickroC
Programmmer:PIC start Plus
Programming :C

I can initialize an LCD when i connect it with 89C51...But i cant do the same thing with Pic microcontroller.. What might be the problem?

Whether its the problem due to compiler or code or Programmer..

Can any one help me...

Please...

 

Please post your code. Initialize LCD code and initialize micro IO pins....... It is common to not have the pins right.

 

Is the code yours?
Sounds like a hardware problem to me if its only black boxes (or bad software).

__________________
Mike
My website: www.ElectroBird.net

 

Thanks for your reply... I have attached the code which i tested in MicroC compiler... But it shows the black boxes... Help me

Program 1:

#define ldata PORTD
#define rs PORTB.F0
#define rw PORTB.F1
#define en PORTB.F2
void lcdcmd(unsigned char );
void lcddata(unsigned char );
void msdelay(unsigned char);
void main(void)
{
TRISD=0;
TRISB=0;
en=0;
msdelay(25);
lcdcmd(0x38);
msdelay(25);
lcdcmd(0x0E);
msdelay(15);
lcdcmd(0x01);
msdelay(15);
lcdcmd(0x06);
msdelay(15);
lcdcmd(0x86);
msdelay(15);
lcddata('A');
msdelay(15);
lcddata('D');
msdelay(15);
lcddata('E');
}
void lcdcmd(unsigned char value)
{
ldata=value;
rs=0;
rw=0;
en=1;
msdelay(1);
en=0;
}
void lcddata(unsigned char value)
{
ldata=value;
rs=1;
rw=0;
en=1;
msdelay(1);
en=0;
}
void msdelay(unsigned char itime)
{
unsigned char i,j;
for(i=0;i<itime;i++)
for(j=0;j<135;j++);
}


Program 2:This program i downloaded it from net.. This program too gives the same output...

char *text= "EQBYTE for All";
signed char data[12];
int i=0;
void main (){
TRISB = 0; // PORTB is output
Lcd_Init(&PORTB); // Initialize LCD connected to PORTB
while (1) {
Lcd_Cmd(Lcd_CLEAR); // Clear display
Lcd_Cmd(Lcd_CURSOR_OFF); // Turn cursor off
for (i=1;i<11;i++)
{
Delay_ms(200);
IntToStr(i,data); //Numeric to string transform (i to data)
Lcd_out(1,1,"Value="); // Print fixed text to LCD (e.g "Value")
Lcd_out(1,8,data); // Print variable text to LCD, 1st row, 8th column (e.g data)
Delay_ms(200);
}
Lcd_Cmd(Lcd_CLEAR); // Clear display
Lcd_Out(2, 1, text); // Print text to LCD, 2nd row, 1st column
Delay_ms(1200);
}
}

 

How do you know if the chip is running or not?

__________________
Mike
My website: www.ElectroBird.net

 

I suspect the problem is hardware. You can add an additional program to blink a LED at some other port to make sure that the PIC is executing the code. Also, you can try my code written in mikroC for LCD interface, though I wrote for PIC16F628A.

-Raj
Experiments with PIC16F628A

 

you can find pre-built library for controlling LCD.....
you can use it if u want to check ur LCD!