pentabug/firmware/main.c

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

#include "main.h"
#include "synth.h"
#include "usart.h"

static void init_sampletimer(void)
{
	/* 
	 * Timer 0
	 */

	/* set timer0 to CTC & prescaler 64 → 125kHz increment */
	TCCR0A = (1 << WGM01);
	TCCR0B = (1 << CS00) | (1 << CS01);

	OCR0A = 6; /* TOP */
	TCNT0 = 0;
	/*enable interrupt*/
	TIMSK0 |=  (1<<OCIE0A);
}

static inline void init_pwm(void)
{
	/* set PB2 as output (buzzer pwm port):*/
	DDRB  |= (1 << PORTB2);

	/* analog value preselection :*/
	OCR1B  =  0x007F;

	/* Top value. Timer overflows here. Thus we have a resulting 8bit pwm */
	ICR1   =  0x00FF;

	/* only b-chan , fastpwm (mode 14), no prescale */
	TCCR1A = (1 << COM1B1) | (1 << WGM11);
	TCCR1B = (1 << WGM13 ) | (1 << WGM12) | (1 << CS10);

	return;
}

static void init_leds(void)
{
	/* enable LED channels as output */
	DDRC |= (1 << PORTC0) | (1 << PORTC2) |
		(1 << PORTC3) | (1 << PORTC1) ;
	/* initially one led is on */
	PORTC = 0b00000101;

	/* 
	 * Timer 2
	 */

	/* set timer0 to CTC & prescaler 64 → 125kHz increment */
	TCCR2A = (1 << WGM21);
	TCCR2B = (1 << CS20) | (1 << CS21);

	OCR2A = 6; /* TOP */
	TCNT2 = 0;
	/*enable interrupt*/
	TIMSK2 |=  (1<<OCIE2A);



	return;
}

inline void setleds(uint8_t state)
{
	/* set leds according to */
	PORTC |= (state | 0b00001111);
	PORTC &= ~(state | 0b11110000);
	return;
}

static void init_motor(void)
{
	/* vibration motor on B1, initially off: */
	DDRB  |= (1 << PORTB1);
	PORTB &= ~( 1<<PORTB1);

}



int main(void)
{
	/* hardware initialisation: */
	init_leds();
	USART0_Init();
	// init_motor();
	init_pwm();
	init_sampletimer();
	
	/* syntesizer initialisation */
	synth_init();

	/* here the show begins:*/
	sei();

	for(;;) /* ever */  {

		//do something

		USART0_put_uint16(0x2342);
		USART0_crlf();
	};

	/* never */ return 0;
}


ISR(TIMER0_COMPA_vect)
{
	/* calculate next analog sample value in synth mixer:*/
	OCR1B = synth_mix();
}
ISR(TIMER2_COMPA_vect)
{
	//PORTC = 0b0000000;
	
}