jim hamblen / Mbed 2 deprecated speaker_demo_PWM

Demo for new class to play a note on a speaker using a PWM output See http://mbed.org/users/4180_1/notebook/using-a-speaker-for-audio-output/

Dependencies:   mbed

Speaker.h@2:68eee0fb2026, 2014-10-21 (annotated)

Committer:
4180_1
Date:
Tue Oct 21 03:14:51 2014 +0000
Revision:
2:68eee0fb2026
Parent:
0:b2fdf3770282 
ver 1.1

Who changed what in which revision?

UserRevisionLine numberNew contents of line
4180_1 0:b2fdf3770282 1 #include "mbed.h"
4180_1 2:68eee0fb2026 2 // a new class to play a note on Speaker based on PwmOut class
4180_1 0:b2fdf3770282 3 class Speaker
4180_1 0:b2fdf3770282 4 {
4180_1 0:b2fdf3770282 5 public:
4180_1 0:b2fdf3770282 6 Speaker(PinName pin) : _pin(pin) {
4180_1 0:b2fdf3770282 7 // _pin(pin) means pass pin to the Speaker Constructor
4180_1 0:b2fdf3770282 8 }
4180_1 0:b2fdf3770282 9 // class method to play a note based on PwmOut class
4180_1 0:b2fdf3770282 10 void PlayNote(float frequency, float duration, float volume) {
4180_1 0:b2fdf3770282 11 _pin.period(1.0/frequency);
4180_1 0:b2fdf3770282 12 _pin = volume/2.0;
4180_1 0:b2fdf3770282 13 wait(duration);
4180_1 0:b2fdf3770282 14 _pin = 0.0;
4180_1 0:b2fdf3770282 15 }
4180_1 0:b2fdf3770282 16
4180_1 0:b2fdf3770282 17 private:
4180_1 0:b2fdf3770282 18 PwmOut _pin;
4180_1 0:b2fdf3770282 19 };