SongPlayer.h

00001 #include "mbed.h"
00002 bool keepplaying = true;
00003 // new class to play a note on Speaker based on PwmOut class
00004 class SongPlayer
00005 {
00006 public:
00007     SongPlayer(PinName pin) : _pin(pin) {
00008 // _pin(pin) means pass pin to the constructor
00009     }
00010 // class method to play a note based on PwmOut class
00011     void PlaySong(float frequency[], float duration[], float volume=1.0) {
00012         vol = volume;
00013         notecount = 0;
00014         _pin.period(1.0/frequency[notecount]);
00015         _pin = volume/2.0;
00016         noteduration.attach(this,&SongPlayer::nextnote, duration[notecount]);
00017         // setup timer to interrupt for next note to play
00018         frequencyptr = frequency;
00019         durationptr = duration;
00020         //returns after first note starts to play
00021     }
00022     void nextnote();
00023 private:
00024     Timeout noteduration;
00025     PwmOut _pin;
00026     int notecount;
00027     float vol;
00028     float * frequencyptr;
00029     float * durationptr;
00030 };
00031 //Interrupt Routine to play next note
00032 void SongPlayer::nextnote()
00033 {
00034     if(keepplaying==true){
00035         _pin = 0.0;
00036         notecount++; //setup next note in song
00037         if (durationptr[notecount]!=0.0) {
00038             _pin.period(1.0/frequencyptr[notecount]);
00039             noteduration.attach(this,&SongPlayer::nextnote, durationptr[notecount]);
00040             _pin = vol/2.0;
00041     }   else
00042             _pin = 0.0; //turn off on last note
00043     }
00044 }