/*****************************************************/
/*
C0220BiZ.c
Program for writing to Newhaven Display Character COG - I2C interface

(c)2009 Curt Lagerstam - Newhaven Display International, LLC. 

 	This program is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 2 of the License, or
	(at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU General Public License for more details.
*/
/*****************************************************/
#include <REG52.H>
/*****************************************************/
code char text1[]={
"NEWHAVEN DisplayXXXX"};
code char text2[]={
"2x20 LCD Module XXXX"};
/*****************************************************/
sbit SDA = P1^0;						//Serial data
sbit SCL = P3^4;						//Serial clock
//sbit XRESET = HIGH;						//RESET
/*****************************************************/
const char Slave = 0x78;
const char Comsend = 0x00;
const char Datasend = 0x40;
const char Line2 = 0xC0;
/*****************************************************/
void delay(unsigned int n)				//Delay subroutine
{
	unsigned int i,j;
	for (i=0;i<n;i++)
  		for (j=0;j<350;j++)
  			{;}
}
/*****************************************************/
void I2C_out(unsigned char j) 			//I2C Output
{
	int n;
	unsigned char d;
	d=j;
	for(n=0;n<8;n++){
		if((d&0x80)==0x80)
		SDA=1;
		else
		SDA=0;
		d=(d<<1);
		SCL = 0;
		SCL = 1;
		SCL = 0;
		}
	SCL = 1;
	while(SDA==1){
		SCL=0;
		SCL=1;
		}
	SCL=0;
}
/*****************************************************/
void I2C_Start(void)
{
	SCL=1;
	SDA=1;
	SDA=0;
	SCL=0;
}
/*****************************************************/
void I2C_Stop(void)
{
	SDA=0;
	SCL=0;
	SCL=1;
	SDA=1;
}
/*****************************************************/
void Show(unsigned char *text)
{
	int n,d;
	d=0x00;
	I2C_Start();
	I2C_out(Slave);
	I2C_out(Datasend);
	for(n=0;n<20;n++){
		I2C_out(*text);
		++text;
		}
	I2C_Stop();
}
/*****************************************************/
void nextline(void)
{
	I2C_Start();
	I2C_out(Slave);
	I2C_out(Comsend);
	I2C_out(Line2);
	I2C_Stop();
}
/****************************************************
*           Initialization For ST7036i              *
*****************************************************/
void init_LCD() 
{
I2C_Start();
I2C_out(Slave);
I2C_out(Comsend);
I2C_out(0x38);
delay(10);
I2C_out(0x39);
delay(10);
I2C_out(0x14);
I2C_out(0x78);
I2C_out(0x5E);
I2C_out(0x6D);
I2C_out(0x0C);
I2C_out(0x01);
I2C_out(0x06);
delay(10);
I2C_Stop();
}
/*****************************************************/
/*****************************************************/
int main(void)
{
int i;
P1 = 0;
P3 = 0;
while(1) 								//continue 
{
	init_LCD();
	delay(2);
	
	Show(text1);
	nextline();
	Show(text2);
	delay(2000);
	
	init_LCD();
	delay(2);
	
	I2C_out(Slave);
	I2C_out(Datasend);
	for(i=0;i<20;i++){//show first 20 chars in font table
	  I2C_out(i);}
	I2C_Stop();
	delay(4000);
}
}