Simple PWM / beep generation library. Supports timed-duration beeps or infinite length tone generation.
Dependents: PseudoTheremin NSDL_HelloWorld_WiFi UbloxModemNanoServiceClient IOT-NSDL_HelloWorld ... more
Beep.cpp
- Committer:
- shimniok
- Date:
- 2013-07-31
- Revision:
- 0:3eb39e374fc3
File content as of revision 0:3eb39e374fc3:
#include "mbed.h" #include "Beep.h" /** Create a Beep object connected to the specified PwmOut pin * * @param pin PwmOut pin to connect to */ Beep::Beep(PinName pin) : _pwm(pin) { _pwm.write(0.0); // after creating it have to be off } /** Stop the beep instantaneously. */ void Beep::nobeep() { _pwm.write(0.0); } /** Beep with given frequency and duration. * * @param frequency - the frequency of the tone in Hz * @param time - the duration of the tone in seconds, 0 runs indefinitely */ void Beep::beep(float freq, float time) { _pwm.period(1.0/freq); _pwm.write(0.5); // 50% duty cycle - beep on if (time > 0) toff.attach(this,&Beep::nobeep, time); // time to off }