Fengrui Chenchen Zuo / Mbed 2 deprecated 3872_play_live

3872 Play-live--test code - tempting to make this the main one

Dependencies:   mbed fastlib

SongPlayer.h@2:9296823ea33d, 2020-11-11 (annotated)

Committer:
chenchen2020
Date:
Wed Nov 11 04:50:30 2020 +0000
Revision:
2:9296823ea33d
Parent:
1:c704bea518d8 
Final;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
chenchen2020 1:c704bea518d8 1 #include "mbed.h"
chenchen2020 1:c704bea518d8 2 // new class to play a note on Speaker based on PwmOut class
chenchen2020 1:c704bea518d8 3 class SongPlayer
chenchen2020 1:c704bea518d8 4 {
chenchen2020 1:c704bea518d8 5 public:
chenchen2020 1:c704bea518d8 6 SongPlayer(PinName pin) : _pin(pin) {
chenchen2020 1:c704bea518d8 7 // _pin(pin) means pass pin to the constructor
chenchen2020 1:c704bea518d8 8 }
chenchen2020 1:c704bea518d8 9 // class method to play a note based on PwmOut class
chenchen2020 1:c704bea518d8 10 void PlaySong(float frequency[], float duration[], float volume=1.0) {
chenchen2020 1:c704bea518d8 11 vol = volume;
chenchen2020 1:c704bea518d8 12 notecount = 0;
chenchen2020 1:c704bea518d8 13 _pin.period(1.0/frequency[notecount]);
chenchen2020 1:c704bea518d8 14 _pin = volume/2.0;
chenchen2020 1:c704bea518d8 15 noteduration.attach(this,&SongPlayer::nextnote, duration[notecount]);
chenchen2020 1:c704bea518d8 16 // setup timer to interrupt for next note to play
chenchen2020 1:c704bea518d8 17 frequencyptr = frequency;
chenchen2020 1:c704bea518d8 18 durationptr = duration;
chenchen2020 1:c704bea518d8 19 //returns after first note starts to play
chenchen2020 1:c704bea518d8 20 }
chenchen2020 2:9296823ea33d 21 void Play_Note(float frequency){
chenchen2020 2:9296823ea33d 22 _pin.period(1.0/frequency);
chenchen2020 1:c704bea518d8 23 _pin = 1.0/2.0;
chenchen2020 1:c704bea518d8 24 }
chenchen2020 1:c704bea518d8 25 void nextnote();
chenchen2020 1:c704bea518d8 26 private:
chenchen2020 1:c704bea518d8 27 Timeout noteduration;
chenchen2020 1:c704bea518d8 28 PwmOut _pin;
chenchen2020 1:c704bea518d8 29 int notecount;
chenchen2020 1:c704bea518d8 30 float vol;
chenchen2020 1:c704bea518d8 31 float * frequencyptr;
chenchen2020 1:c704bea518d8 32 float * durationptr;
chenchen2020 1:c704bea518d8 33 };
chenchen2020 1:c704bea518d8 34 //Interrupt Routine to play next note
chenchen2020 1:c704bea518d8 35 void SongPlayer::nextnote()
chenchen2020 1:c704bea518d8 36 {
chenchen2020 1:c704bea518d8 37 _pin = 0.0;
chenchen2020 1:c704bea518d8 38 notecount++; //setup next note in song
chenchen2020 1:c704bea518d8 39 if (durationptr[notecount]!=0.0) {
chenchen2020 1:c704bea518d8 40 _pin.period(1.0/frequencyptr[notecount]);
chenchen2020 1:c704bea518d8 41 noteduration.attach(this,&SongPlayer::nextnote, durationptr[notecount]);
chenchen2020 1:c704bea518d8 42 _pin = vol/2.0;
chenchen2020 1:c704bea518d8 43 } else
chenchen2020 1:c704bea518d8 44 _pin = 0.0; //turn off on last note
chenchen2020 1:c704bea518d8 45 }