audio.h

#ifndef ArduboyAudio_h
#define ArduboyAudio_h

#include <Arduino.h>
#include <EEPROM.h>
#include <avr/pgmspace.h>
#include <avr/power.h>

#define AVAILABLE_TIMERS 2
#define TUNE_OP_PLAYNOTE	0x90	/* play a note: low nibble is generator #, note is next byte */
#define TUNE_OP_STOPNOTE	0x80	/* stop a note: low nibble is generator # */
#define TUNE_OP_RESTART	0xe0	/* restart the score from the beginning */
#define TUNE_OP_STOP	0xf0	/* stop playing */


class ArduboyAudio
{
public:
	void setup();
	void on();
	void off();
	void save_on_off();
	bool enabled();
	void tone(uint8_t channel, unsigned int frequency, unsigned long duration);

protected:
	bool audio_enabled;
};


class ArduboyTunes
{
public:
	// Playtune Functions
	void initChannel(byte pin);			// assign a timer to an output pin
	void playScore(const byte *score);	// start playing a polyphonic score
	void stopScore();			// stop playing the score
	void delay(unsigned msec);		// delay in milliseconds
	void closeChannels();			// stop all timers
	bool playing();
  void tone(unsigned int frequency, unsigned long duration);

	// called via interrupt
	void static step();
	void static soundOutput();

private:
	void static playNote (byte chan, byte note);
	void static stopNote (byte chan);
};
#endif