#include "avr\io.h" 		// definiční soubor pro mikrokontrolér
#include <avr\delay.h>
#include <avr\pgmspace.h>
#include <avr\lcd.h>
#include <stdlib.h>


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

prog_uchar 	sin_vzorky[256]= {130,133,135,138,140,143,145,
148,150,152,155,157,159,162,164,166,169,171,173,175,177,179,
181,184,186,188,190,191,193,195,197,199,200,202,204,205,207,
208,210,211,212,214,215,216,217,218,219,220,221,222,223,224,
224,225,226,226,227,227,227,228,228,228,228,228,228,228,228,
228,227,227,227,226,226,225,224,224,223,222,221,220,219,218,
217,216,215,214,212,211,210,208,207,205,204,202,200,199,197,
195,193,191,190,188,186,184,181,179,177,175,173,171,169,166,
164,162,159,157,155,152,150,148,145,143,140,138,135,133,130,
128,126,123,121,118,116,113,111,108,106,104,101,99,97,94,92,
90,87,85,83,81,79,77,75,72,70,68,66,65,63,61,59,57,56,54,52,
51,49,48,46,45,44,42,41,40,39,38,37,36,35,34,33,32,32,31,30,
30,29,29,29,28,28,28,28,28,28,28,28,28,29,29,29,30,30,31,32,
32,33,34,35,36,37,38,39,40,41,42,44,45,46,48,49,51,52,54,56,
57,59,61,63,65,66,68,70,72,75,77,79,81,83,85,87,90,92,94,97,
99,101,104,106,108,111,113,116,118,121,123,126,128};


int main( void )
{
unsigned int	i,f;
unsigned int 	prah;
long	faze,delta_reg;
unsigned int	faze_posun;
unsigned char	*vzorek;
char	data[6];



// ******Nastaveni portu******
// DDR: 0 - vstup, 1 - výstup
// PORT: 0 - "L"/Hi-Z , 1 - "H"/Pull-up
DDRA = 0b11111111;
PORTA = 0b00000000;
DDRB = 0b00000000;
PORTB = 0b00000000;
DDRC = 0b11111111;
PORTC = 0b00000000;
DDRD = 0b00000000;
PORTD = 0b00000000;

TCCR0 = 0b00000001;
TCNT0 = 0;
OCR0 = 0;


//pocatecni nastaveni kmitoctu
faze = 0;
f = 500; //Hz
delta_reg = f*65535/31373;
i = 0;
prah = 255;
faze_posun = 0;


lcdInit();

lcdGotoXY(0,0);
lcdPrintData("Generator DDS",13 );


lcdGotoXY(0,1);
lcdPrintData("kmitocet:",9);

itoa(f,data, 10);

lcdGotoXY(9,1);
lcdPrintData(data,6);

lcdGotoXY(14,1);
lcdPrintData("Hz",2);



while(1)
 {

// fazovy akumulator
faze = faze + delta_reg;

//nacteni jen 8 hornich bitu faze
faze_posun = faze >> 8;




//zabraneni preteceteni faze
if(faze > 65534)
{
	faze = faze - 65534; //zajisteni, aby faze plynule pokracovala
	prah = 0;
	faze_posun = 0;
		if(faze>65535)
		faze = 0;

	faze_posun = faze >> 8;
	
}




//zvyseni kmitoctu pri stisknuti tlacitka 1
if(!(PIND & (1<<PIND2)))
{
	f++;

		if(f>7000)
		f=7000;

	delta_reg = f*65536/31373;
	_delay_ms(10);

	lcdGotoXY(0,0);
	lcdPrintData("Generator DDS", 13);
	
	lcdGotoXY(0,1);
	lcdPrintData("kmitocet:",9);

	itoa(f,data, 10);

	lcdGotoXY(9,1);
	lcdPrintData(data,6);

	lcdGotoXY(14,1);
	lcdPrintData("Hz",2);
}


//snizeni kmitoctu pri stisknuti tlacitka 2
if(!(PIND & (1<<PIND3)))
{
	f--;

		if(f<20)
		f=20;

	delta_reg = f*65536/31373;
	_delay_ms(10);

	lcdGotoXY(0,0);
	lcdPrintData("Generator DDS", 13);
	
	lcdGotoXY(0,1);
	lcdPrintData("kmitocet:",9);

	itoa(f,data, 10);

	lcdGotoXY(9,1);
	lcdPrintData(data,6);

	lcdGotoXY(14,1);
	lcdPrintData("Hz",2);

}




vzorek = &sin_vzorky[0];
vzorek = vzorek + faze_posun;



//cekani na naplneni citace
while(!(TIFR & (1<<TOV0)))
{
}

TIFR |=(1<<TOV0); 

PORTC = pgm_read_byte(vzorek);

 }
return (1);
}