Nick Zhao / Mbed 2 deprecated Lab2Part14

Lab2Part14

Dependencies:   mbed

SongPlayer.h@0:59e9c82b3e5f, 2019-10-07 (annotated)

Committer:
TCNoodleshop
Date:
Mon Oct 07 02:40:31 2019 +0000
Revision:
0:59e9c82b3e5f
Lab2Part14;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
TCNoodleshop 0:59e9c82b3e5f 1 #include "mbed.h"
TCNoodleshop 0:59e9c82b3e5f 2 // new class to play a note on Speaker based on PwmOut class
TCNoodleshop 0:59e9c82b3e5f 3 class SongPlayer
TCNoodleshop 0:59e9c82b3e5f 4 {
TCNoodleshop 0:59e9c82b3e5f 5 public:
TCNoodleshop 0:59e9c82b3e5f 6 SongPlayer(PinName pin) : _pin(pin) {
TCNoodleshop 0:59e9c82b3e5f 7 // _pin(pin) means pass pin to the constructor
TCNoodleshop 0:59e9c82b3e5f 8 }
TCNoodleshop 0:59e9c82b3e5f 9 // class method to play a note based on PwmOut class
TCNoodleshop 0:59e9c82b3e5f 10 void PlaySong(float frequency[], float duration[], float volume=1.0) {
TCNoodleshop 0:59e9c82b3e5f 11 vol = volume;
TCNoodleshop 0:59e9c82b3e5f 12 notecount = 0;
TCNoodleshop 0:59e9c82b3e5f 13 _pin.period(1.0/frequency[notecount]);
TCNoodleshop 0:59e9c82b3e5f 14 _pin = volume/2.0;
TCNoodleshop 0:59e9c82b3e5f 15 noteduration.attach(this,&SongPlayer::nextnote, duration[notecount]);
TCNoodleshop 0:59e9c82b3e5f 16 // setup timer to interrupt for next note to play
TCNoodleshop 0:59e9c82b3e5f 17 frequencyptr = frequency;
TCNoodleshop 0:59e9c82b3e5f 18 durationptr = duration;
TCNoodleshop 0:59e9c82b3e5f 19 //returns after first note starts to play
TCNoodleshop 0:59e9c82b3e5f 20 }
TCNoodleshop 0:59e9c82b3e5f 21 void nextnote();
TCNoodleshop 0:59e9c82b3e5f 22 private:
TCNoodleshop 0:59e9c82b3e5f 23 Timeout noteduration;
TCNoodleshop 0:59e9c82b3e5f 24 PwmOut _pin;
TCNoodleshop 0:59e9c82b3e5f 25 int notecount;
TCNoodleshop 0:59e9c82b3e5f 26 float vol;
TCNoodleshop 0:59e9c82b3e5f 27 float * frequencyptr;
TCNoodleshop 0:59e9c82b3e5f 28 float * durationptr;
TCNoodleshop 0:59e9c82b3e5f 29 };
TCNoodleshop 0:59e9c82b3e5f 30 //Interrupt Routine to play next note
TCNoodleshop 0:59e9c82b3e5f 31 void SongPlayer::nextnote()
TCNoodleshop 0:59e9c82b3e5f 32 {
TCNoodleshop 0:59e9c82b3e5f 33 _pin = 0.0;
TCNoodleshop 0:59e9c82b3e5f 34 notecount++; //setup next note in song
TCNoodleshop 0:59e9c82b3e5f 35 if (durationptr[notecount]!=0.0) {
TCNoodleshop 0:59e9c82b3e5f 36 _pin.period(1.0/frequencyptr[notecount]);
TCNoodleshop 0:59e9c82b3e5f 37 noteduration.attach(this,&SongPlayer::nextnote, durationptr[notecount]);
TCNoodleshop 0:59e9c82b3e5f 38 _pin = vol/2.0;
TCNoodleshop 0:59e9c82b3e5f 39 } else
TCNoodleshop 0:59e9c82b3e5f 40 _pin = 0.0; //turn off on last note
TCNoodleshop 0:59e9c82b3e5f 41 }