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PIC18F4550 to LCD 1602 - “Hello World” Attempt - Demo program problems. *Solved*

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Dubbie:
The warnings are not code errors. The clear lcd function is in there because the minute you start a real project, you’ll need that function.

MarkF:
Another thing you can do is replace the MSdelay() function with the built-in delay routine __delay_ms(milliseconds)
You also need to define the clock frequency (_XTAL_FREQ) for the routine to work.
See lines 9, 44, 64 and 74 below.

Usage:
   -Define _XTAL_FREQ
   -Use __delay_ms(x) for milliseconds
   -Use __delay_us(x) for microseconds


--- Code: ---/*
 * Interfacing 16x2 LCD with PIC18F4550
 * [url=http://www.electronicwings.com]www.electronicwings.com[/url]
 */

//#include <pic18f4550.h>
#include "Configuration_Header_File.h"

#define _XTAL_FREQ 8000000L

#define RS LATD0                    /*PORTD 0 pin is used for Register Select*/
#define EN LATD1                    /*PORTD 1 pin is used for Enable*/
#define ldata LATB                  /*PORTB is used for transmitting data to LCD*/
#define LCD_Port TRISB              /*define macros for PORTB Direction Register*/
#define LCD_Control TRISD           /*define macros for PORTD Direction Register*/


void LCD_Init(void);
void LCD_Clear(void);
void LCD_Command(char);
void LCD_Char(char x);
void LCD_String(const char*);
void LCD_String_xy(char, char, const char*);

/*****************************Main Program*******************************/
void main(void)
{
   OSCCON = 0x72;                          /*Use Internal Oscillator with Frequency 8 MHZ*/

   LCD_Init();                             /*Initialize 16x2 LCD*/

   LCD_String_xy(1,5,"Hello");             /*Display string at location(row,location).
                                            * This function passes string to display*/

   LCD_String_xy(2,0,"ElectronicWings");   /*Display string at location(row,location).
                                            * This function passes string to display*/

   while(1);
}

/****************************Functions********************************/
void LCD_Init(void)
{
   __delay_ms(15);        /*15ms,16x2 LCD Power on delay*/
   LCD_Port = 0x00;       /*Set PORTB as output PORT for LCD data(D0-D7) pins*/
   LCD_Control = 0x00;    /*Set PORTD as output PORT LCD Control(RS,EN) Pins*/
   LCD_Command(0x38);     /*uses 2 line and initialize 5*7 matrix of LCD*/
   LCD_Command(0x01);     /*clear display screen*/
   LCD_Command(0x0c);     /*display on cursor off*/
   LCD_Command(0x06);     /*increment cursor (shift cursor to right)*/
}

void LCD_Clear(void)
{
   LCD_Command(0x01);     /*clear display screen*/
}

void LCD_Command(char cmd)
{
   ldata = cmd;           /*Send data to PORT as a command for LCD*/
   RS = 0;                /*Command Register is selected*/
   EN = 1;                /*High-to-Low pulse on Enable pin to latch data*/
   NOP();
   EN = 0;
   __delay_ms(3);
}

void LCD_Char(char dat)
{
   ldata = dat;           /*Send data to LCD*/
   RS = 1;                /*Data Register is selected*/
   EN = 1;                /*High-to-Low pulse on Enable pin to latch data*/
   NOP();
   EN = 0;
   __delay_ms(1);
}

void LCD_String(const char *msg)
{
   while((*msg)!=0)
   {
      LCD_Char(*msg);
      msg++;
   }
}

void LCD_String_xy(char row, char pos, const char *msg)
{
   char location = 0;

   if(row<=1)
   {
      location = (0x80) | ((pos) & 0x0f); /*Print message on 1st row and desired location*/
      LCD_Command(location);
   }
   else
   {
      location = (0xC0) | ((pos) & 0x0f); /*Print message on 2nd row and desired location*/
      LCD_Command(location);
   }
   LCD_String(msg);
}


--- End code ---

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