at89c52 and lcd interfacing

[gnoble29]

i have an at89c52 and a 16*2 lcd display. how i connect my lcd to 89c52 to disply the message welcome...


if any one know the source code,plz post...



thanks in advance

 

[ckshivaram]

8 bit or 4 bit???? which mode you are using.... do a search forum first you get lot of information............

 

[gnoble29]

i am using 8 bit mode

 

[ckshivaram]

#include <reg52.h>
#include <math.h>
void lcdcmd (unsigned char);
void lcddata (unsigned char);
void msdelay (unsigned int);
void LCD_sendstring(unsigned char * );

////////////////////////////////////// 
sfr ldata =0x90;
sbit rs=P3^7;
sbit rw=P3^6;
sbit en=P3^5;
sbit g=P2^7;
/////////////////////////////


void main(void)
{
lcdcmd (0x3;
msdelay (100);
lcdcmd (0x0C);
msdelay (100);
LCD_sendstring("16x2 LCD");
msdelay(1000)



lcdcmd (0x01);
msdelay(5);

}

void lcdcmd (unsigned char value)
{ 
ldata=value;
rs=0;
rw=0;
en=1;
msdelay (10);
en=0;
}

void lcddata (unsigned char value)
{
ldata=value;
rs=1;
rw=0;
en=1;
msdelay (10);
en=0; 
}


void msdelay (unsigned int itime)
{
unsigned int i,j;
for (i=0;i<itime;i++)
for (j=0;j<1275;j++);
}


void LCD_sendstring(unsigned char *value)
{
while(*value) 
lcddata(*value++); 
}

 

[gnoble29]

when compiling on keil i have got the following error messages..what will i do??

 

[Embedded_Geek]

when compiling on keil i have got the following error messages..what will i do??

This error is because you copied the code to an asm file( i.e. *.a51). Make a new file with extension *.C then copy the code there. Then it would work perfectly.

 

[ckshivaram]

rename the file as " .c" not .a51 or .asm ............................

 

[gnoble29]

This error is because you copied the code to an asm file( i.e. *.a51). Make a new file with extension *.C then copy the code there. Then it would work perfectly.

thanks lot:-D

---------- Post added at 16:58 ---------- Previous post was at 16:53 ----------

which model of lcd display should i select in proteus for simulating the above code....i have proteus6 professional...it provides varity of 16*2 lcd display

 

[ckshivaram]

See if your hardware is connected to as in the program to get output....

modify the 1st line after main function lcdcmd (0x3;
as lcdcmd(0x30);

 

[gnoble29]

to which pin of 8052 should i connect db0.db1........db7 pins of lcd

 

[Embedded_Geek]

Go for

LM016L 16x2

---------- Post added at 21:35 ---------- Previous post was at 21:34 ----------

to which pin of 8052 should i connect db0.db1........db7 pins of lcd

Connect to any port.

---------- Post added at 21:36 ---------- Previous post was at 21:35 ----------



I have highlighted the LCD in proteus

 

[ckshivaram]

not to any port.......... it is port1...

 

[gnoble29]

is this connection is correct???

 

[Embedded_Geek]

not to any port.......... it is port1...

Yeah correct. By mistake i thought of modifying the code later

 

[gnoble29]

thanks a lot...i succeded in lcd display.it is my first proteus simulation..thanks

 

[ckshivaram]

No.............. connect to port1 not port 2 the data lines..........

 

[gnoble29]

---------- Post added at 17:32 ---------- Previous post was at 17:29 ----------

In this program,the display will blinks after some delay....what modifiacation should made to make the output displas the same thing at everytime..that means no blinks....

 

[ckshivaram]

can you explain? what is blinks do you need it to be premanently still........

 

[gnoble29]

yes..i need the display premanently still...

 

[ckshivaram]

in the main before closing bracket put while(1);

---------- Post added at 22:40 ---------- Previous post was at 22:39 ----------

after msdelay(5); in the end of the main