File content as of revision 3:df1e38c2c57b:

#include "Piezo.h"

Piezo::Piezo(PinName Pwmout):_pwm(Pwmout)
{
    min_freq = 1.0;
    max_freq = 20000.0;
    
    _pwm.period(1);
    _pwm.write(0.0);
}

void Piezo::play(float frequency, int duration_ms)
{
    float Frequency = (frequency < min_freq)? min_freq : frequency;
    Frequency = (frequency > max_freq)? max_freq : frequency;
    
    Period = 1.0/Frequency;
    
    _pwm.period(Period);
    _pwm.write(0.5);
    wait_ms(duration_ms);
    _pwm.write(0.0);
}

void Piezo::playAsync(float frequency, int duration_ms)
{
    float Frequency = (frequency < min_freq)? min_freq : frequency;
    Frequency = (frequency > max_freq)? max_freq : frequency;
    
    Period = 1.0/Frequency;
    
    _pwm.period(Period);
    _pwm.write(0.5);
    _timer.detach();
    _timer.attach_us(this,&Piezo::stop, duration_ms*1000);
}

void Piezo::stop(void)
{
    _pwm.write(0.0);
}