#define 	F_CPU 1000000	// Taktfrequenz des Atmega32
#include	<avr\io.h>	// AVR Register und Konstantendefinitionen
#include 	<util\delay.h>	// Bibliothek mit Warteroutinen

//variablen deklarieren
uint8_t contrast = 0xFF;	
uint8_t Xpixel   = 128;
uint8_t Ypages   = 8;
uint8_t xoffset;
uint8_t topview = 0; 		

// Versorgung 3,3V, 4fach-Boost an
//-----------------------------------------------------------------------------------------
// Konstanten fue�r ST7565
//-----------------------------------------------------------------------------------------

#define DISPOFF      0xAE
#define DISPON       0xAF
#define DISPSTART    0x40
#define PAGEADR      0xB0
#define COLADRL      0x00
#define COLADRH      0x10
#define ADCNORMAL    0xA0
#define ADCREVERSE   0xA1
#define COMNORMAL    0xC0
#define COMREVERSE   0xC8
#define DISPNORMAL   0xA6
#define DISPREVERSE  0xA7
#define LCDBIAS9     0xA2
#define LCDBIAS7     0xA3
#define RESET        0xE2
#define SETPOWERCTRL 0x28
#define REGRESISTOR  0x20
#define SETCONTRAST  0x81
#define STATINDMODE  0xAC
#define BOOSTERRATIO 0xF8

//-----------------------------------------------------------------------------------------
// Portdefinitionen
//-----------------------------------------------------------------------------------------

#define DOGCSPORT	PORTB
#define DOGCS		4

#define DOGRESPORT	PORTC
#define DOGRES		6

#define DOGA0PORT	PORTC
#define DOGA0		2

#define DOGSCLPORT	PORTB
#define DOGSCL		7

#define DOGSIPORT	PORTB
#define DOGSI		5

//-----------------------------------------------------------------------------------------
// Makrodefinitionen
//-----------------------------------------------------------------------------------------

#define SetBit(adr, bnr)	( (adr) |=  (1 << (bnr)) )
#define ClrBit(adr, bnr)	( (adr) &= ~(1 << (bnr)) )

#define	DOGENABLE  ClrBit(DOGCSPORT, DOGCS)
#define	DOGDISABLE SetBit(DOGCSPORT, DOGCS)

#define	DOGCOMMAND ClrBit(DOGA0PORT, DOGA0)
#define	DOGDATA    SetBit(DOGA0PORT, DOGA0)

//-----------------------------------------------------------------------------------------

void dogSPIout(char out)
{
	char msk;

	msk = 0x80;
	do
	{
		ClrBit(DOGSCLPORT, DOGSCL);
		if(out & msk)
			SetBit(DOGSIPORT, DOGSI);
		else
			ClrBit(DOGSIPORT, DOGSI);
		SetBit(DOGSCLPORT, DOGSCL);
		msk >>= 1;
	}
	while(msk > 0);
}

//-----------------------------------------------------------------------------------------

void initDOGM128(void)
{

	DOGENABLE;
	DOGCOMMAND;

	dogSPIout(DISPSTART + 0);
	if(topview)
	{
		xoffset = 4;
		dogSPIout(ADCNORMAL);
		dogSPIout(COMREVERSE);
	}
	else
	{
		xoffset = 0;
		dogSPIout(ADCREVERSE);
		dogSPIout(COMNORMAL);
	}
	dogSPIout(DISPNORMAL);
	dogSPIout(LCDBIAS9);
	dogSPIout(SETPOWERCTRL+7);
	dogSPIout(BOOSTERRATIO);     dogSPIout(0);
	dogSPIout(REGRESISTOR+7);
	dogSPIout(SETCONTRAST);      dogSPIout(contrast);
	dogSPIout(STATINDMODE);      dogSPIout(0);
	dogSPIout(DISPON);

	DOGDISABLE;
}

//-----------------------------------------------------------------------------------------

void ResetDOG(void)
{
	SetBit(DOGCSPORT,  DOGCS);
	SetBit(DOGSCLPORT, DOGSCL);
	SetBit(DOGSIPORT,  DOGSI);
	SetBit(DOGA0PORT,  DOGA0);

	ClrBit(DOGRESPORT,  DOGRES);
	_delay_us(5);
	SetBit(DOGRESPORT,  DOGRES);
}

//-----------------------------------------------------------------------------------------

void DogKontrast(void)
{
	DOGENABLE;
	DOGCOMMAND;

	dogSPIout(SETCONTRAST);
	dogSPIout(contrast);

	DOGDISABLE;
}

//-----------------------------------------------------------------------------------------
// Makro zum ausgeben von irgendwas auf dem Display
//-----------------------------------------------------------------------------------------
void ausgabe(void)
{
	DOGENABLE;
	DOGDATA;
	dogSPIout(0xF0);dogSPIout(0xF0);dogSPIout(0xF0);dogSPIout(0xF0);dogSPIout(0xF0);dogSPIout(0xF0);
	DOGDISABLE;
}

//-----------------------------------------------------------------------------------------

//Variablen-Deklarationen
volatile char FCV_TASTER;

//Hauptprogramm
int main()
{
	//Ausgänge Definieren
	DDRB = 0xFF;
	DDRC = 0xFF;

	//Hauptschleife
	while(1)
	{
		//Output; High auf A0/Pullup für Taster
		//Output: 1 -> A0
		DDRA = DDRA | 0x01;
		if (1)
			PORTA = (PORTA & 0xfe) | 0x01;
		else
			PORTA = PORTA & 0xfe;
	
	
		//Input; Taster gedrückt = LOW
		//Input: A0 -> taster
		DDRA = DDRA & 0xfe;
		FCV_TASTER = ((PINA & 0x01) == 0x01);
	
	
		//Entscheidung
		//Entscheidung: taster=0?
		if (FCV_TASTER==0)
		{
			//Schleife
			//Schleife: While taster=0
			while (FCV_TASTER==0)
			{
			}
	
			initDOGM128();
			
			ausgabe();
	
		}
	
	}
	mainendloop: goto mainendloop;
}