[SOLVED] having single error in lcd program

[jayanth.devarayanadurga]

Post project files + Proteus file zipped.

 

[PRABAKARDEVA]

just the cursor blinking in the lcd...it did not write the command....can anybody clarify it to me...

- - - Updated - - -

i had already posted the project files.....i didn't get any error..

- - - Updated - - -

#include<pic.h>
#include<htc.h>
 
 __CONFIG(FOSC_HS & WDTE_OFF & PWRTE_OFF & CP_OFF & BOREN_OFF & LVP_OFF & CPD_OFF & DEBUG_OFF);
 
#define _XTAL_FREQ    16000000
#define RS RE1
#define EN RE2

 
void lcd_init(void);
void lcd_command(unsigned int);
void lcd_data(unsigned int);
void lcd_print(unsigned char*);
void main()
{
    lcd_init();
    
 while(1)
 {
        
   lcd_print((unsigned char *)"HELLO");
//lcd_print('1');
    __delay_ms(1000);
   lcd_print((unsigned char *)"world");
//lcd_print('2');
    __delay_ms(1000);
    lcd_command(0x06);
 }   
    }
    void lcd_print(unsigned char array[])
    {
        unsigned char i;
        for(i=0;array[i]!='\0';i++)
        lcd_data(array[i]);
        }
        
    
    void lcd_init(void)
    {
            PORTD=0x00;
    TRISD=0x00;
        TRISE1=0;
        TRISE2=0;
        lcd_command(0x38);
        lcd_command(0x0F);
        lcd_command(0x01);
    lcd_command(0x84);
           
        
        }
        void lcd_command(unsigned int command)
        {
            RS=0;
            PORTD=command;
            EN=1;
            __delay_ms(1000);
            EN=0;
            __delay_ms(1000);
            }
    
    void lcd_data(unsigned int data)
    {
        RS=1;
        PORTD=data;
        EN=1;
        __delay_ms(1000);
        EN=0;
        __delay_ms(1000);
        }

 

[jayanth.devarayanadurga]

Add this as last command in lcd_init() function.

---

Code C - [expand]
1
lcd_command(0x0C); // Turn of Cursor

---

 

[PRABAKARDEVA]

the cursor has been hidden....it didn't displayed in lcd....after that command included..

 

[Venkadesh_M]

https://saeedsolutions.blogspot.in/2012/11/pic16f877-lcd-interfacing-code-in-8bit.html
Follow it, definitely it will help you............

 

[reachrajesh]

the above program is not working in hardware why?

 

[jayanth.devarayanadurga]

Delays inside the

---

Code C - [expand]
1
lcd_command()

---

and

---

Code C - [expand]
1
lcd_data()

---

functions are too high. Make is 500 us.

 

[reachrajesh]

THIS IS MY PROGRAM ITS WORKING IN PROTEUS BUT NOT WORKING IN DEVELOPMENT BOARD PLEASE HELP ME GUYS.

/*LCD DISPLAY INTERFACING IN PIC*/
#include<htc.h>
#include<pic16f877a.h>

#include<string.h>
#include<stdio.h>
#define _XTAL_FREQ 20e6
__CONFIG(WDTE_OFF & PWRTE_ON & BOREN_ON & LVP_OFF & CPD_OFF & CP_OFF & CPD_OFF & DEBUG_OFF);
//__CONFIG( FOSC_HS & WDTE_OFF & PWRTE_ON & CP_OFF & BOREN_ON & LVP_OFF & CPD_OFF & WRT_OFF & DEBUG_OFF);


#define load PORTB

#define RS RC0
#define RW RC1
#define EN RC2
void delayms(unsigned int);
void lcd_cmnd(unsigned char);
void lcd_data(unsigned char);
void lcd_print(unsigned char*);
void lcd_init(void);
void main(void)
{


lcd_init();
delayms(50);
//lcd_cmnd(0X80);
//delayms(100);
lcd_print("ABCD");
delayms(50);
//lcd_cmnd(0X01);
//delayms(100);

while(1)
{

;
}
}
void lcd_print(unsigned char *myStr)
{

// while(*myStr)
lcd_data(*myStr++);
}
void lcd_init()
{
TRISB=0X00;
PORTB=0X00;
TRISC0=0;
TRISC1=0;
TRISC2=0;
load=0X00;

lcd_cmnd(0X38); // configuring LCD as 2 line 5x7 matrix
lcd_cmnd(0X0E); // Display on, Cursor blinking
lcd_cmnd(0X01); // Clear Display Screen
lcd_cmnd(0X06); // Increment Cursor (Right side)
}


void lcd_cmnd(unsigned char command)
{

RS=0;
load=command;
RW=0;
EN=1;
delayms(500);
EN=0;
delayms(1);
}



void lcd_data(unsigned char display)
{

RS=1;
load=display;
RW=0;
EN=1;
delayms(500);
EN=0;
delayms(1);
}






void delayms(unsigned int delayms)
{
unsigned int i,j;
for(i=0;i<=delayms;i++)
{
for(j=0;j<=100;j++);
}
}









/*unsigned int i=0;
while(*data)
{
load=*data++;
rs=1;
rw=0;
en=1;
delayms(1);
en=0;
if(data>=16)
lcd_cmnd(0x18); // Shift the display right side
delayms(100);

}
}*/

 

[errakeshpillai]

If your program is working fine in Proteus and not working on the development board, then in most cases the problem will be with the delays. Just try changing the delays. I have faced such issues where my program works fine in Proteus but not on boards.

 

[reachrajesh]

I will try it and get back u sir.

 

[jayanth.devarayanadurga]

---

Code C - [expand]
1
delay_ms(500)

---

is too high.

 

[Venkadesh_M]

you are going to write 2 chrs per second....

 

[errakeshpillai]

Delay of 1 ms is okay even between EN=0 and EN=1.

 

[reachrajesh]

you are going to write 2 chrs per second....

actually i am new to pic. i worked some projects in 8052. but i don't know how to work in pic and then i want to learn register configurations too. here i am going to write one character only.

- - - Updated - - -

but this code is not working in real hardware.

 

[Venkadesh_M]

With hitech compiler use the predefined delay functions __delay_ms() with the definition

---

Code C - [expand]
1
#define _XTAL_FREQ 12000000 //ex for 12Mhz

---

refer the lcd datasheet for delay timings first time it shd be more than 15ms and after that 37us is enough between commands and datas.... so better allow 1ms....

 

[reachrajesh]

ok i will check it and inform you.

 

[jayanth.devarayanadurga]

https://www.edaboard.com/threads/287832/

 

[PRABAKARDEVA]

how to scroll the characters in lcd?

 

[jayanth.devarayanadurga]

If you want to scroll single line of LCD then the lcd data should be in a string (char array) and you have to shift the contents of the array and print it everytime after shifting the elements. Also try shifting the lcd column no. If you print "Hello" starting at 16th column then repetedly print the string decrementing the column everytime by 1. If you add delay with it then the text will scroll.



Edit: LCD Scroll commands scroll all the lines of LCD.

 

[errakeshpillai]

There is a command in LCD (i.e. JHD162) for shifting the characters right or left. You can try out that command.