buzzer
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Diff: buzzer.cpp
- Revision:
- 0:01eac446ef9f
- Child:
- 2:9133a863f1dd
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/buzzer.cpp Thu May 05 00:28:41 2016 +0000 @@ -0,0 +1,52 @@ +#include "buzzer.h" +#include "mbed.h" + +/** class to make sound with a buzzer, based on a PwmOut + * The class use a timeout to switch off the sound - it is not blocking while making noise + * + * Example: + * @code + * // Beep with 1Khz for 0.5 seconds + * #include "mbed.h" + * #include "beep.h" + * + * Beep buzzer(PTC2); + * + * int main() { + * ... + * buzzer.beep(1000,0.5); + * ... + * } + * @endcode + */ + +using namespace mbed; + // constructor + /** 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 instantaneous + * usually not used + */ +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 + */ + +void Beep::beep(float freq, float time) { + + _pwm.period(1.0/freq); + _pwm.write(0.5); // 50% duty cycle - beep on + toff.attach(this,&Beep::nobeep, time); // time to off +} \ No newline at end of file