Interfacing PIC with LCD (Details Inside!)

#include <htc.h>
#include <string.h>
#include "ProcessorConfiguration.h"
#include "FunctionPrototypes.h"
#include "Definitions.h"

void main(void){

	portInit();
	LCDInit();
	writeString("Hello World!");
	
}

static void interrupt isr(void){

}

//May be moved to its own .c file later

void LCDInit(void){
	E = 0; 
	delay(15); //Wait >15 msec after power is applied 
	initCommand(0x30); //command 0x30 = Wake up 
	delay(5); //must wait 5ms, busy flag not available 
	initCommand(0x30); //command 0x30 = Wake up #2 
	delay(160); //must wait 160us, busy flag not available 
	initCommand(0x30); //command 0x30 = Wake up #3 
	delay(160); //must wait 160us, busy flag not available 
	command(0x38); //Function set: 8-bit/2-line 
	command(0x10); //Cursor shift mode, S/C to the Left 
	command(0x0C); //1DCB: Display ON; Cursor OFF; Blink OFF 
	command(0x06); //Entry mode: Inc cursor and display shift off 
	clearDisplay(); 
	returnHome(); 

}

void initCommand(char theCommand){ //Cannot Utilize BF
	LCDCOMMAND = theCommand; //put command on PORTD 
	RS = RS_COMMAND; // Select Command Register 
	RWn = WRITE; // Write Mode 
	E = 1; 
	E = 0; //Clock enable: falling edge 
}

void command(char theCommand) { 
	waitForNotBusy(); 
	LCDCOMMAND = theCommand; //put command on PORTD 
	RS = RS_COMMAND; // Select Command Register 
	RWn = WRITE; // Write Mode 
	E = 1; 
	E = 0; //Clock enable: falling edge 
}

void clearDisplay(void) { 
	waitForNotBusy(); 
	command(0x01); //Clear Display 
}

void returnHome(void) { 
	waitForNotBusy(); 
	command(0x02); //Return Home 
}

void waitForNotBusy(void) { 
	unsigned char BF; 

	RS = RS_COMMAND; // Select Command Register 
	RWn = READ; // Read Mode 
	BF = 0b10000000; 
	TRISD = 0b11111111; 
	delay(1); // Wait at least 80 μs before reading BF 

	while(BF==0b10000000){ 
		E = 1; 
		BF = LCDDATA & 0b10000000; 
		E = 0; //Clock enable: falling edge 
	}
	TRISD = 0b00000000; 
}

void delay(unsigned char loops) {
	unsigned char i;
	loops += 69;
	for(i=0; i<loops;i++){}
}

//End of block pasted from LCDInitialization.c

void setDisplayLine(unsigned char line, unsigned char position) { //This function is incomplete.
	switch(line) { 
		case 1:command(0b01000000); 
		break; 
		case 2:command(0b11000000);
		break; 
	} 
}

void writeChar(char theData) { 
	waitForNotBusy(); 
	LCDDATA = theData; //put data on PORTD 
	RS = RS_DATA; // Select Data Register 
	RWn = WRITE; // Write Mode 
	E = 1; //enable pulse width >= 300ns 
	E = 0; //Clock enable: falling edge 
}

void writeString(char *theString) { 
	unsigned char i; 
	for(i = 0; i < strlen(theString); i++) { 
		waitForNotBusy(); 
		LCDDATA = theString[i]; // Put data on PORTD 
		RS = RS_DATA; // Select Data Register 
		RWn = WRITE; // Write Mode 
		E = 1; // Enable pulse width >= 300ns 
		E = 0; // Clock enable: falling edge 
	} 
}

#include <htc.h>

void portInit(void){
//Configure for Digital IO
PCFG3 = 0;
PCFG2 = 1;
PCFG1 = 1;

TRISE0 = 0;
TRISE1 = 0;
TRISE2 = 0;
TRISD = 0b00000000; //Configure PORTD for output

INTCON = 0; //Disable interrupts.
}

#define LCD_L1home()    LCD_Cde(0x80)
#define LCD_L2home()    LCD_Cde(0xC0)
#define LCD_Clear()     LCD_Cde(0x01)
#define LCD_ReturnHome() LCD_Cde(0x02)

void LCD_Pos(char L,char posX)
{
 char x;
 if (L==1) x=0x80+posX;
 if (L==2) x=0xC0+posX;
 LCD_Cde(x);
}