Simple PWM / beep generation library. Supports timed-duration beeps or infinite length tone generation.
Dependents: PseudoTheremin NSDL_HelloWorld_WiFi UbloxModemNanoServiceClient IOT-NSDL_HelloWorld ... more
Diff: Beep.cpp
- Revision:
- 0:3eb39e374fc3
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Beep.cpp Wed Jul 31 23:05:44 2013 +0000 @@ -0,0 +1,29 @@ +#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 +}