/*

  * 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

 }