lcd driving

[mayur_bankhele]

I want C code for Pic microcontroller in microc compiler for LCD driving . i tried to right down the code but it is working fine but sometimes it fails displaying gaurbage vaule on lcd what ever code i write it work only this pattern only if i interchanged the line below fuction set code it will not work


#include "built_in.h"
#define fset 0x28
#define clr_dsp 0x01
#define e_mode 0x06
#define dis_on 0x0f

#define LINE1 0x80
#define LINE2 0xC0
#define RS PORTD.F3
#define WR PORTD.F2
#define EN PORTD.F1

int i;

void lccd_toggle(void);
void lccd_cmd(unsigned char cmd);
void lccd_data(unsigned char data) ;
void lccd_Init(void);
void lccd_str(unsigned char str[32]);
void lccd_num(unsigned int n);
void lccd_wait ();

void main()
{ unsigned int cnt=0;
TRISA=0x07;
TRISB=0x10;
TRISC=0x87;
TRISD=0x00;
TRISE=0x00;


ADCON0=0x01;
ADCON1=0x0A;
ADCON2=0x8D;
CMCON =0x07;
// CVRCON=0x00;
PORTA=PORTB=PORTC=PORTD=PORTE=0 ;
// Lcd_Custom_Config(&PORTD,7,6,5,4,&PORTD,3,2,1);/*==============*/
// Lcd_Custom_Cmd(LCD_CURSOR_OFF);

// Lcd_Custom_Out(1, 3, "Hello!");
lccd_Init();
//lccd_cmd(LINE1);
// delay_ms(500);
while(1){
// Lcd_Custom_Out(1, 3, "Hello!");
// Lcd_Custom_Out(2, 3, "Hello!");
//lccd_data('A');//
lccd_str("mayurbankhele");
lccd_cmd(0xC0);
lccd_str("mayurbankhele");
lccd_cmd(0x80);

}



}

void lccd_cmd(unsigned char cmmd)
{
RS=0; EN=0;
PORTD =(cmmd & 0xF0); //send upper 4 bits of given command
EN=1; delay_ms(20);EN=0;
delay_ms(10);

i=cmmd & 0x0F; //send lower 4 bits of given command
RS=0; PORTD=(i<<4);
EN=1; delay_ms(20); EN=0;
delay_ms(10);

}

void lccd_data(unsigned char data)
{
unsigned int may=0,hit=0;
EN=0;
may= ((data & 0xF0)|(0x08));
PORTD =may;
EN=1; delay_us(500); EN=0;
hit=(data & 0x0F);
may=((hit<<4)|(0x08));
PORTD =(may);
EN=1; delay_us(500); EN=0;
}
void lccd_Init(void)
{
delay_ms(15);
PORTD=0x30;RS=0;
delay_ms(10);
PORTD=0x30;RS=0;
delay_us(500);
PORTD=0x30;RS=0;
delay_us(500);
PORTD=0x20;RS=0;
delay_ms(10);
lccd_cmd(0x28); //function set

lccd_cmd(0x06); // set cursor move direction 110 1,id,s
lccd_cmd(0x08); //Enable display/cursor 1100 1,D,C,B display,cursor,blink ON/OFF
lccd_cmd(0x0C);
lccd_cmd(0x80);
}
void lccd_str(unsigned char str[32])
{
unsigned char j=0;
RS=1; EN=0;
while(str[j]!='\0')
{
if(j==16)
lccd_cmd(LINE2);
lccd_data(str[j]);
j++;
}
}



void lccd_num(unsigned int n)
{
unsigned char b[10],f=0;
int i=0,j=0;
if(n==0)
{
lccd_data('0'+f);
}
else
{
while(n>0)
{
b[j]=n%10;
j++;
n=n/10;
if(n>0)
f=1;
else
f=0;
}
for(i=j-1;i>=0;i--)
{
lccd_data('0'+b);
}
}
}

 

[Ian Rogers]

Firstly Lccdinit() should be called before any Lcd operation... (I know they are remmed out but they can't go there.

Secondly.. There doesn't appear to be any clocking in the Lccdinit() section... You need to EN = 1 then EN = 0 on each init parameter.