why cursor is not moving to next immediate position on LCD 16×2 ( LCD in 4 bit Interface and 2 line)?

[siva]

 

#include<P18f4620.h>  

#define LCD_RS PORTAbits.RA3 

#define LCD_RW PORTAbits.RA2 

#define LCD_EN PORTAbits.RA1 

void _delay(unsigned int count)

{

unsigned int j1,k;

for(k=0;k<count;k++)

for(j1=0;j1<900;j1++);

}

void lcddata(char dataout) 

{ 

PORTD = dataout; 

LCD_RS = 1 ;

LCD_RW = 0 ;

 

LCD_EN=1;

_delay(5);

LCD_EN=0;

} 

void dis_data(char data_value) 

{ 

char data_value1; 

data_value1 = ((data_value >> 4) & 0x0F) ; 

lcddata(data_value1); 

_delay(2) ; 

data_value1 = (data_value & 0x0F) ; 

lcddata(data_value1); 

_delay(2) ; 

} 

  

void lcdcmd(char cmdout) 

{ 

PORTD=cmdout; 

LCD_RS = 0 ;

LCD_RW = 0 ;

LCD_EN=1;

_delay(5);

LCD_EN=0; 

} 

void dis_cmd(char cmd_value) 

{ 

char cmd_value1; 

cmd_value1 = ((cmd_value >> 4) & 0x0F) ;

lcdcmd(cmd_value1);

  _delay(2) ; 

cmd_value1 = (cmd_value & 0x0F) ;

lcdcmd(cmd_value1);

_delay(2) ; 

} 

  

 

void INIT_LCD(void) 

{ 

_delay(15) ;

dis_cmd(0x03);

_delay(5) ;

dis_cmd(0x03);

_delay(1) ;

dis_cmd(0x03);

_delay(5); 

dis_cmd(0x02); 

_delay(1) ; 

 

dis_cmd(0x28);

_delay(1) ;

dis_cmd(0x08);

_delay(1) ; 

dis_cmd(0x01); 

_delay(2) ;

dis_cmd(0x06);  

_delay(1) ;

dis_cmd(0x0e);

_delay(1) ;

dis_cmd(0x80); 

_delay(1) ; 

} 

void INIT_HW(void) 

{ 

TRISD = 0x00 ; 

TRISA = 0x00 ;  

}  

  

 

void main(void) 

{ 

unsigned char str_1[12] = “ELECTRONICS” , i=0;

INIT_HW() ; 

INIT_LCD() ; 

 

while(str_1!=0)

{ 

dis_data(str_1);

_delay(5) ;

i++;

}

} 

 

  

 

 

 

          we are running the the above code on PICDEM 2 PLUS DEMO BOARD using debugger ICD3 in MPLAB. We observed on lcd the cursor is not going to 81(2nd position in 1st line) from 80 (1st position in 1st line) and it is going to 2nd line from 1st position in 1st line without displaying data.

            If anybody knows please help me. We are doing this one from 1 week.

 

                                                                                    Thank you…………

 

                     

                

  

[siva]

pls give me the solution as early as possible

[AJISH ALFRED]

Hi Siva,

I think this could be some issues related with pointer access. Try modifying your decleration of array as follows;

unsigned char *str_1 = “ELECTRONICS”;

i = 0;

Befor using any string in your code, Make sure that your ‘dis_data()’ function is working by trying out some random alphabets jsut after INIT_LCD() like,

dis_data(‘A’);

dis_data(‘B’);

[siva]

Sorry ALFRED 

 

 

in my code PORTA is in analog thats why it has not worked.

now it is working fine

 

[AJISH ALFRED]

Hi Siva,

Alright, now we just learned one more thing, and that is more important!

[siva]

k good

[Author]

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