/*
-------------------------------------
Normally only used for BOARD ELAVR32,
using Port A for a LCD-Display
-------------------------------------
*/


// Datei: LCD.H
//
// Ansteuerung einer LCD-Anzeige
// im 4 Bit Daten Mode
//
// Holger Klabunde
// 11.10.2002
// Compiler AVR-GCC
// 08.12.2005
// changed by Elmar Benninghaus
// for own board elavr32

//Ausgänge für die Ansteuerung der LCD-Anzeige
//PORTA AVR an Datenleitungen der LCD-Anzeige


#ifndef ___LCD_H
#define ___LCD_H


#include "global.h"
#include "utils.h"

#ifdef FCPU1
#define LCDDELAYENABLE DELAY1us
#endif
#ifdef FCPU2
#define LCDDELAYENABLE DELAY500ns
#endif
#ifdef FCPU4
#define LCDDELAYENABLE DELAY250ns
#endif
#ifdef FCPU8
#define LCDDELAYENABLE DELAY250ns
#endif
#ifdef FCPU11
#define LCDDELAYENABLE DELAY271ns
#endif
#ifdef FCPU14
#define LCDDELAYENABLE DELAY271ns
#endif
#ifdef FCPU16
#define LCDDELAYENABLE DELAY250ns
#endif


//for ( black/green lcd with KS0070B controller (HD44780 compatible)
//the initial reset after power-up is min 15 milliseconds.
//The used max executiontime is 1.64 ms for Display Clear, and Return Home.
//The normally max. executionstime for others like Write Data ....
//is 46 Mikrosek.
//
//With an ext. clock of 14,7456 Mhz, the timings used from global.h
//trying to reduce it what, upper meaned lcd really uses, additionally
//a little tolerance.
//With current timings we are able to use a setpos, and a complete write
//of 16 chars to this position, 276 times per second. ( one row displ.)
//138 times per second for 2xsetpos, and 2x16chars ( 2 row display )
// 69 times per second for 4xsetpos, and 4x16chars ( 4 row display )
// We can reduce this timings a little bit, reading the lcd for the
// busy-flag, but normally the execution times, explained in the datasheets
// are the really times, so it seems to be equal if we poll, or wait.


//if you do not use the same signals as board elavr32
//you have to define followings before.
#ifndef LCD_CS

#define LCD_RS	2 //LCD Register Select
#define LCD_CS	1 //LCD Chip Select
#define LCD_RW	3 //LCD R/_W

#define LCDCS_ON() { sbi(PORTA,LCD_CS); }
#define LCDCS_OFF() { cbi(PORTA,LCD_CS); }

#define LCDRS_ON() { sbi(PORTA,LCD_RS); }
#define LCDRS_OFF() { cbi(PORTA,LCD_RS); }

#define LCDWR_OFF() { sbi(PORTA,LCD_RW); }
#define LCDWR_ON() { cbi(PORTA,LCD_RW); }

#endif


extern void LCDInit(void);
extern void LCDWriteByte(unsigned char);
extern void LCDWriteCmd(unsigned char);

extern void LCDWrite(char *);
extern void LCDWriteP(char *);
extern void LCDCls(void);
extern void LCDPos(unsigned char, unsigned char);
extern void ShowHex(unsigned char by);


#endif