Tea Pack / PiezoSpeaker

Simple tool for PWM piezo speaker

Piezo.cpp@3:df1e38c2c57b, 2016-10-01 (annotated)

Committer:
TeaPack_CZ
Date:
Sat Oct 01 21:24:26 2016 +0000
Revision:
3:df1e38c2c57b
Parent:
0:39de01daa2de 
Add documentation for public functions.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
TeaPack_CZ 0:39de01daa2de 1 #include "Piezo.h"
TeaPack_CZ 0:39de01daa2de 2
TeaPack_CZ 0:39de01daa2de 3 Piezo::Piezo(PinName Pwmout):_pwm(Pwmout)
TeaPack_CZ 0:39de01daa2de 4 {
TeaPack_CZ 0:39de01daa2de 5 min_freq = 1.0;
TeaPack_CZ 0:39de01daa2de 6 max_freq = 20000.0;
TeaPack_CZ 0:39de01daa2de 7
TeaPack_CZ 0:39de01daa2de 8 _pwm.period(1);
TeaPack_CZ 0:39de01daa2de 9 _pwm.write(0.0);
TeaPack_CZ 0:39de01daa2de 10 }
TeaPack_CZ 0:39de01daa2de 11
TeaPack_CZ 0:39de01daa2de 12 void Piezo::play(float frequency, int duration_ms)
TeaPack_CZ 0:39de01daa2de 13 {
TeaPack_CZ 0:39de01daa2de 14 float Frequency = (frequency < min_freq)? min_freq : frequency;
TeaPack_CZ 0:39de01daa2de 15 Frequency = (frequency > max_freq)? max_freq : frequency;
TeaPack_CZ 0:39de01daa2de 16
TeaPack_CZ 0:39de01daa2de 17 Period = 1.0/Frequency;
TeaPack_CZ 0:39de01daa2de 18
TeaPack_CZ 0:39de01daa2de 19 _pwm.period(Period);
TeaPack_CZ 0:39de01daa2de 20 _pwm.write(0.5);
TeaPack_CZ 0:39de01daa2de 21 wait_ms(duration_ms);
TeaPack_CZ 0:39de01daa2de 22 _pwm.write(0.0);
TeaPack_CZ 0:39de01daa2de 23 }
TeaPack_CZ 0:39de01daa2de 24
TeaPack_CZ 0:39de01daa2de 25 void Piezo::playAsync(float frequency, int duration_ms)
TeaPack_CZ 0:39de01daa2de 26 {
TeaPack_CZ 0:39de01daa2de 27 float Frequency = (frequency < min_freq)? min_freq : frequency;
TeaPack_CZ 0:39de01daa2de 28 Frequency = (frequency > max_freq)? max_freq : frequency;
TeaPack_CZ 0:39de01daa2de 29
TeaPack_CZ 0:39de01daa2de 30 Period = 1.0/Frequency;
TeaPack_CZ 0:39de01daa2de 31
TeaPack_CZ 0:39de01daa2de 32 _pwm.period(Period);
TeaPack_CZ 0:39de01daa2de 33 _pwm.write(0.5);
TeaPack_CZ 0:39de01daa2de 34 _timer.detach();
TeaPack_CZ 0:39de01daa2de 35 _timer.attach_us(this,&Piezo::stop, duration_ms*1000);
TeaPack_CZ 0:39de01daa2de 36 }
TeaPack_CZ 0:39de01daa2de 37
TeaPack_CZ 0:39de01daa2de 38 void Piezo::stop(void)
TeaPack_CZ 0:39de01daa2de 39 {
TeaPack_CZ 0:39de01daa2de 40 _pwm.write(0.0);
TeaPack_CZ 0:39de01daa2de 41 }