Sound via PWM

// ATtiny2313, 20MHz
#define F_CPU 20000000UL

#include <avr/io.h>
//#include <util/delay.h>
#include <avr/interrupt.h>
#include <avr/pgmspace.h>

#define pwmout 5

// TCCRxX
#define WGMx0	0
#define WGMx2	3
#define COMxB0	4
#define CSx0	0

// TIMSK
#define OCIE1A	6
#define OCIE1B	5

typedef unsigned char	uint8;
typedef unsigned short	uint16;

volatile uint8 i;
const uint8 wavetable[340] PROGMEM = {
0x82, 0x86, 0x85, 0x85, 0x85, 0x85, 0x85, 0x85, 0x85, 0x85, 0x8D, 0x95, 0x96, 0x95, 0x95, 0x95,
0x95, 0x95, 0x95, 0x94, 0x97, 0xA0, 0xA5, 0xA4, 0xA4, 0xA4, 0xA4, 0xA4, 0xA4, 0xA3, 0xA3, 0xAA,
0xB3, 0xB4, 0xB3, 0xB3, 0xB3, 0xB3, 0xB3, 0xB3, 0xB2, 0xB4, 0xBD, 0xC3, 0xC2, 0xC2, 0xC2, 0xC2,
0xC1, 0xC1, 0xC1, 0xC0, 0xC6, 0xCD, 0xCF, 0xCE, 0xCD, 0xCD, 0xCD, 0xCD, 0xCD, 0xCC, 0xCE, 0xD5,
0xDA, 0xDA, 0xD9, 0xD9, 0xD9, 0xD9, 0xD8, 0xD8, 0xD7, 0xDC, 0xE3, 0xE5, 0xE4, 0xE4, 0xE4, 0xE4,
0xE4, 0xE3, 0xE2, 0xE4, 0xEA, 0xF0, 0xF0, 0xEF, 0xEF, 0xEF, 0xEF, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE,
0xED, 0xED, 0xED, 0xED, 0xED, 0xEC, 0xEC, 0xED, 0xEB, 0xE5, 0xDE, 0xDD, 0xDE, 0xDE, 0xDD, 0xDD,
0xDD, 0xDD, 0xDD, 0xDA, 0xD2, 0xCE, 0xCF, 0xCF, 0xCE, 0xCE, 0xCE, 0xCE, 0xCE, 0xCE, 0xC8, 0xC1,
0xBF, 0xC0, 0xC0, 0xC0, 0xC0, 0xBF, 0xBF, 0xC0, 0xBD, 0xB5, 0xB1, 0xB1, 0xB2, 0xB1, 0xB1, 0xB1,
0xB1, 0xB2, 0xB1, 0xAB, 0xA2, 0xA0, 0xA1, 0xA1, 0xA1, 0xA1, 0xA0, 0xA0, 0xA1, 0x9F, 0x96, 0x90,
0x90, 0x91, 0x90, 0x90, 0x90, 0x90, 0x91, 0x91, 0x8B, 0x82, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
0x80, 0x81, 0x80, 0x78, 0x71, 0x71, 0x72, 0x72, 0x72, 0x72, 0x72, 0x72, 0x73, 0x6D, 0x64, 0x61,
0x62, 0x62, 0x62, 0x62, 0x62, 0x62, 0x63, 0x62, 0x5A, 0x53, 0x52, 0x53, 0x53, 0x53, 0x53, 0x53,
0x54, 0x55, 0x50, 0x47, 0x43, 0x44, 0x45, 0x45, 0x45, 0x45, 0x45, 0x46, 0x45, 0x3C, 0x33, 0x32,
0x33, 0x33, 0x33, 0x34, 0x34, 0x34, 0x35, 0x31, 0x26, 0x21, 0x22, 0x23, 0x23, 0x23, 0x23, 0x23,
0x24, 0x24, 0x1C, 0x12, 0x11, 0x12, 0x12, 0x12, 0x13, 0x13, 0x13, 0x14, 0x11, 0x06, 0x01, 0x01,
0x02, 0x02, 0x03, 0x03, 0x03, 0x03, 0x03, 0x04, 0x04, 0x04, 0x04, 0x05, 0x05, 0x05, 0x06, 0x06,
0x05, 0x08, 0x13, 0x1A, 0x1A, 0x19, 0x1A, 0x1A, 0x1A, 0x1A, 0x1A, 0x1A, 0x21, 0x2C, 0x2F, 0x2E,
0x2E, 0x2E, 0x2E, 0x2F, 0x2F, 0x2E, 0x30, 0x3A, 0x42, 0x42, 0x42, 0x42, 0x42, 0x42, 0x43, 0x42,
0x42, 0x48, 0x53, 0x57, 0x55, 0x55, 0x56, 0x56, 0x56, 0x56, 0x55, 0x57, 0x5F, 0x66, 0x67, 0x66,
0x66, 0x66, 0x66, 0x66, 0x66, 0x65, 0x6A, 0x73, 0x77, 0x76, 0x76, 0x76, 0x76, 0x76, 0x77, 0x76,
0x77, 0x7E, 0x85, 0x85
};



ISR(TIMER1_COMPA_vect) {
	OCR0B = pgm_read_byte(wavetable+i);
	if(i!=339) {
		i++;
	}
	else {
		i=0;
	}
}

int main(void) {
	DDRD |= (1 << pwmout);
	PORTD |= (1 << pwmout);

	TCCR0A |= (3 << WGMx0); // 0-normal, 1-phase correct pwm ,2-ctc, 3-fast pwm
	TCCR0A |= (3 << COMxB0); // ^ V
	TCCR0B |= (1 << CSx0);	// clock source - CPU/1

	TCCR1B |= (1 << WGMx2); // CTC mode
	TCCR1B |= (1 << CSx0); // clock source - CPU/8
	TIMSK |= (1 << OCIE1A); // enable timer1 compA interrupt
	OCR1A = 57; // 44100kHz (57)
//	OCR1A = 169; // 14714kHz

	i=0;
	sei();
	while(1) {
		asm("nop");

	}
	return 0;
}