/*

 * Project Frontplatte

 *

 * t6963.c  -  Controll a t6963c display

 *

 * This file is released under the GNU General Public License. Refer

 * to the COPYING file distributed with this package.

 *

 * (c) 2007 Carsten Presser cpresser AT fsing.uni-sb.de

 *  heavily inspired by Holger Klabunde

 */

/** I N C L U D E S **********************************************************/

#include <p18cxxx.h>

#include "t6963.h"

#include "io_cfg.h"

/** P R I V A T E  P R O T O T Y P E S ***************************************/

unsigned char	lcd_checkBusy(void);

/** V A R I A B L E S ********************************************************/

unsigned char	lcd_auto_mode = MODE_NOAUTO;

/** H I G H L E V E L ********************************************************/

void lcd_ClearScreen(void)

{

 	unsigned int i;

	// Address Pointer Set

	lcd_WriteData(0x00);		// byte1

	lcd_WriteData(0x00);		// byte2

	lcd_WriteCommand(0x24);	//set!

	// bis 0x08F0 löschen...

	lcd_SetAutomode(MODE_AUTO);

	for(i=0; i <= 0x11E; i++)

  	{

   		lcd_WriteData(0x00); lcd_WriteData(0x00);

   		lcd_WriteData(0x00); lcd_WriteData(0x00);

   		lcd_WriteData(0x00); lcd_WriteData(0x00);

   		lcd_WriteData(0x00); lcd_WriteData(0x00);

  	}

	lcd_SetAutomode(MODE_NOAUTO); 

	lcd_WriteData(0x00);		// byte1

	lcd_WriteData(0x00);		// byte2

	lcd_WriteCommand(0x24);	//set!

}

void lcd_InitDisplay(void)

{

	mLcdDataDirOut();

	mLcdWriteData(0x00);

	mLcdInitCtrl();

	// MODE_SET

	lcd_WriteCommand(0x80);	// OR-Mode; CG-ROM Mode

	// DISPLAY_MODE

	lcd_WriteCommand(0x9C);	// GFX-Mode=1, Text-Mode=1, Cursor=0, Blink=0 -> C

	// CONTROL_WORD set Text-Area-Home

	lcd_WriteData(0x00);		// byte1

	lcd_WriteData(0x08);		// byte2

	lcd_WriteCommand(0x40);	//set!

	// CONTROL_WORD SET Text-Area

	lcd_WriteData(0x1E);		// TA-Value (Address of Second Line)

	lcd_WriteData(0x00);		// always Zero

	lcd_WriteCommand(0x41);	// set!

	// CONTROL_WORD set GFX-Area-Home

	lcd_WriteData(0x00);		// byte1

	lcd_WriteData(0x00);		// byte2

	lcd_WriteCommand(0x42);	//set!

	// CONTROL_WORD SET GFX-Area

	lcd_WriteData(0x1E);		// Start-Address of Second Line

	lcd_WriteData(0x00);		// always Zero

	lcd_WriteCommand(0x43);	// set!

	lcd_ClearScreen();

}

/** I N T E R F A C E ********************************************************/

unsigned char lcd_CheckBusy(void)

{

	unsigned char by;

	D_CD	= MODE_COMMAND;

	mLcdDataDirIn();

	if (lcd_auto_mode == MODE_AUTO)

	{

		// in auto_mode only status3 is valid

 		do	{

    		D_RD	= 0;

    		by		= mLcdReadData();

    		by		&= 0x08;

    		D_RD	= 1;

			} 

		while (by!=0x08);

	} 

	else

	{

		// check status1 & status 2

 		do	{

    		D_RD	= 0;

    		by		= mLcdReadData();

    		by		&= 0x03;

    		D_RD	= 1;

			} 

		while (by!=0x03);

	}

	mLcdDataDirOut();

	return by;

}

void lcd_SetAutomode(unsigned char mode)

{

	unsigned char by;

	if (mode == MODE_AUTO) 

	{

		lcd_WriteCommand(0xB0);	// Data Auto Write Set 

		lcd_CheckBusy();

	} 

	else

	{

		lcd_WriteCommand(0xB2);	// Auto Mode Reset

	}

	lcd_auto_mode = mode;

	return;

}

void lcd_WriteData(unsigned char dat)

{

 lcd_CheckBusy();

 D_CD	= MODE_DATA;

 mLcdWriteData(dat); //Daten schreiben

 D_WR	= 0;

 D_WR	= 1;

}

void lcd_WriteCommand(unsigned char comand)

{

 lcd_CheckBusy();

 D_CD	= MODE_COMMAND;

 mLcdWriteData(comand); //Kommando schreiben

 D_WR	= 0;

 D_WR	= 1;

}

void lcd_WriteByte(unsigned char dat)

{

 lcd_WriteData(dat); //Daten schreiben

 lcd_WriteCommand(0xC0); //Kommando schreiben

}