PololuBuzzer.h

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// Copyright Pololu Corporation.  For more information, see http://www.pololu.com/
 
#pragma once
 
#include <avr/pgmspace.h>
 
#define PLAY_AUTOMATIC 0
 
 
#define PLAY_CHECK     1
 
//                                             n
// Equal Tempered Scale is given by f  = f  * a
//                                   n    o
//
//  where f  is chosen as A above middle C (A4) at f  = 440 Hz
//         o                                        o
//  and a is given by the twelfth root of 2 (~1.059463094359)
 
#define NOTE_C(x)       ( 0 + (x)*12)
#define NOTE_C_SHARP(x) ( 1 + (x)*12)
#define NOTE_D_FLAT(x)  ( 1 + (x)*12)
#define NOTE_D(x)       ( 2 + (x)*12)
#define NOTE_D_SHARP(x) ( 3 + (x)*12)
#define NOTE_E_FLAT(x)  ( 3 + (x)*12)
#define NOTE_E(x)       ( 4 + (x)*12)
#define NOTE_F(x)       ( 5 + (x)*12)
#define NOTE_F_SHARP(x) ( 6 + (x)*12)
#define NOTE_G_FLAT(x)  ( 6 + (x)*12)
#define NOTE_G(x)       ( 7 + (x)*12)
#define NOTE_G_SHARP(x) ( 8 + (x)*12)
#define NOTE_A_FLAT(x)  ( 8 + (x)*12)
#define NOTE_A(x)       ( 9 + (x)*12)
#define NOTE_A_SHARP(x) (10 + (x)*12)
#define NOTE_B_FLAT(x)  (10 + (x)*12)
#define NOTE_B(x)       (11 + (x)*12)
 
#define SILENT_NOTE   0xFF
 
#define DIV_BY_10     (1 << 15)
class PololuBuzzer
{
  public:
 
  static void playFrequency(unsigned int freq, unsigned int duration,
                unsigned char volume);
 
  static void playNote(unsigned char note, unsigned int duration,
          unsigned char volume);
 
  static void play(const char *sequence);
 
  static void playFromProgramSpace(const char *sequence);
 
  static void playMode(unsigned char mode);
 
  static unsigned char playCheck();
 
  static unsigned char isPlaying();
 
  static void stopPlaying();
 
 
  private:
 
  // initializes timer for buzzer control
  static void init2();
  static void init();
};