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simple lcd programm for pic16f877

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chaudhryali55

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hi !

i need a help for writing a programm in c to display text on lcd like "hello".m using mplab compiler .and there is no built in functions for lcd..can anyone provide a code that will make the lcd to display text..m using pic16f877 ..thanks
 

you can see this code for understanding

void LCD_init()
{

LCD_command(0x38 );
delay(10);
LCD_command(0x06);
delay(10);
LCD_command(0x0C);
delay(10);
LCD_command(0x02);
delay(10);
LCD_command(0x01);
delay(10);

}

void LCD_command(unsigned char comm)
{

PORTB=comm;
rs = 0; //register select=command
delay(1);
rw = 0; //write
delay(1);
en = 1;
delay(10); //Enable H->L
en = 0;
delay(10);
}

void Sendchar(unsigned char dat)
{
PORTB=dat;
rs = 1; //register select=data
delay(1);
rw = 0; //write
delay(1);
en = 1;
delay(10); //Enable H->L
en = 0;
delay(10);
}

void main()
{
LCD_init();
Sendchar('h');
Sendchar('e');
Sendchar('l');
Sendchar('l');
Sendchar('o');
}
 

it is useful code thatnks... what header files should i use ? btw m using mikro c Pro compiler so i dont think i must need the header files... m i ri8 ?


btw thanks very much it really helped me.
 

you can use LCD.h
there s nothing in that file
i have attached it hegre please find it.
and ofcaurse the p16f877.h
 

Attachments

  • lcd.h.txt
    157 bytes · Views: 143

m using mickro c compiler .i just stoped for mplab...there is built in function of lcd in mikro c compiler but there is no RW function used as m using 8 bit.m hardware only works on the below asm code this is built code for pi simulator ide..can anybody provide me the same thing in c ? thanks in advance
Code: 
Define ADC_CLOCK = 3 'default value is 3
Define ADC_SAMPLEUS = 10 'default value is 20
Define LCD_BITS = 8 'allowed values are 4 and 8 - the number of data interface lines
Define LCD_DREG = PORTB
Define LCD_DBIT = 0 '0 or 4 for 4-bit interface, ignored for 8-bit interface
Define LCD_RSREG = PORTD
Define LCD_RSBIT = 1
Define LCD_EREG = PORTD
Define LCD_EBIT = 3
Define LCD_RWREG = PORTD 'set to 0 if not used, 0 is default
Define LCD_RWBIT = 2 'set to 0 if not used, 0 is default
Define LCD_COMMANDUS = 2000 'delay after LCDCMDOUT, default value is 5000
Define LCD_DATAUS = 50 'delay after LCDOUT, default value is 100
Define LCD_INITMS = 2 'delay used by LCDINIT, default value is 100
'the last three Define directives set the values suitable for simulation; they should be omitted for a real device
 
Dim an0 As Word
 
TRISA = 0xff 'set all PORTA pins as inputs
ADCON1 = 0 'set all PORTA pins as analog inputs
Lcdinit 1 'initialize LCD module; cursor is blinking
 
loop:
   Adcin 0, an0
   Lcdcmdout LcdClear 'clear LCD display
   Lcdout "Analog input AN0" 'text for the line 1
   Lcdcmdout LcdLine2Home 'set cursor at the beginning of line 2
   Lcdout "Value: ", #an0 'formatted text for line 2
   WaitMs 1 'larger value should be used in real device
Goto loop 'loop forever
 

i used this programm and it runs fine on the simulator but on the hardware it is not implemented...i want a code that i can use all the 8 bits...and RW...thanks is advance..
 

IF you use Hitech C, this where you can find a working code:
C:\Program Files\HI-TECH Software\PICC\9.71a\samples\LCDemo
I have tested this sample and it works fine, but you should understand a few things:
This one uses a 4 bit interface, I have one for 8 bit interface lying somewhere, but dont remember which computer. If you keep the HD44780 data sheet and the program code together you will understand how to send data over 8 bit interface instead of 4 bit.
while working with PICs configuration bits need to be properly programmed if you dont do it properly your micro will not work in the circuit for sure.
Ah I found another one, in Mikro C, tested this one too a while ago and it works.
 

Attachments

  • LCD 8 bit.rar
    3.9 KB · Views: 120
Last edited:
chaudhryali55 said:
i want a code that i can use all the 8 bits...and RW...thanks is advance..
Click to expand...
I think this is the solution.


/*
Date: 25-01-2011
Project name: 8bit LCD
Author: Denshil
MCU: PIC16F877A
LCD: Lcd 2x16
Compiler: mikroC PRO
*/

sbit LCD8_RS at RB2_bit;
sbit LCD8_RW at RB3_bit;
sbit LCD8_EN at RB4_bit;
sbit LCD8_D7 at RD7_bit;
sbit LCD8_D6 at RD6_bit;
sbit LCD8_D5 at RD5_bit;
sbit LCD8_D4 at RD4_bit;
sbit LCD8_D3 at RD3_bit;
sbit LCD8_D2 at RD2_bit;
sbit LCD8_D1 at RD1_bit;
sbit LCD8_D0 at RD0_bit;

sbit LCD8_RS_Direction at TRISB2_bit;
sbit LCD8_RW_Direction at TRISB3_bit;
sbit LCD8_EN_Direction at TRISB4_bit;
sbit LCD8_D7_Direction at TRISD7_bit;
sbit LCD8_D6_Direction at TRISD6_bit;
sbit LCD8_D5_Direction at TRISD5_bit;
sbit LCD8_D4_Direction at TRISD4_bit;
sbit LCD8_D3_Direction at TRISD3_bit;
sbit LCD8_D2_Direction at TRISD2_bit;
sbit LCD8_D1_Direction at TRISD1_bit;
sbit LCD8_D0_Direction at TRISD0_bit;

char firstRow[] = "8bit LCD Project";
char secondRow[] = "It's very simple";
void main(){
Lcd8_Init();
Lcd8_Cmd(_LCD_CLEAR);
Lcd8_Cmd(_LCD_CURSOR_OFF);
Lcd8_Out(1,1,firstRow);
Lcd8_Out(2,1,secondRow);

}
 
thnks abid ....i m using a tranier board in university but i dont still know what kind of crap is this borad..no manual for its internal connection..by the way i will try to use the code and and then give u feedback that who it worked ..thanks guys.

---------- Post added at 04:15 ---------- Previous post was at 04:13 ----------
Denshil said:
I think this is the solution.


/*
Date: 25-01-2011
Project name: 8bit LCD
Author: Denshil
MCU: PIC16F877A
LCD: Lcd 2x16
Compiler: mikroC PRO
*/

sbit LCD8_RS at RB2_bit;
sbit LCD8_RW at RB3_bit;
sbit LCD8_EN at RB4_bit;
sbit LCD8_D7 at RD7_bit;
sbit LCD8_D6 at RD6_bit;
sbit LCD8_D5 at RD5_bit;
sbit LCD8_D4 at RD4_bit;
sbit LCD8_D3 at RD3_bit;
sbit LCD8_D2 at RD2_bit;
sbit LCD8_D1 at RD1_bit;
sbit LCD8_D0 at RD0_bit;

sbit LCD8_RS_Direction at TRISB2_bit;
sbit LCD8_RW_Direction at TRISB3_bit;
sbit LCD8_EN_Direction at TRISB4_bit;
sbit LCD8_D7_Direction at TRISD7_bit;
sbit LCD8_D6_Direction at TRISD6_bit;
sbit LCD8_D5_Direction at TRISD5_bit;
sbit LCD8_D4_Direction at TRISD4_bit;
sbit LCD8_D3_Direction at TRISD3_bit;
sbit LCD8_D2_Direction at TRISD2_bit;
sbit LCD8_D1_Direction at TRISD1_bit;
sbit LCD8_D0_Direction at TRISD0_bit;

char firstRow[] = "8bit LCD Project";
char secondRow[] = "It's very simple";
void main(){
Lcd8_Init();
Lcd8_Cmd(_LCD_CLEAR);
Lcd8_Cmd(_LCD_CURSOR_OFF);
Lcd8_Out(1,1,firstRow);
Lcd8_Out(2,1,secondRow);

}
Click to expand...

thnks it really helped me.. i used your logic before but it was not implementing on the board i think the trainer board i just ...leave it ..:) ..by the way thanks
 

try proton or picbasic,don't bother with asm or C,too many bracket,lines, etc...,to print on lcd in basic ,simply do this :
print at 1,1,"Hello"

and check help file for other fonction,before in past,i programmed in ASm,now i dont waste my time
 

Here is a fully implemented code for the LCD display for PIC16877. This is programmed in assembly and actually says "Hello World!" lol
 

Attachments

  • LCD.zip
    6.3 KB · Views: 133

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