Fork of beep lib. Enables play of continous tones and changing of frequency on the fly
Fork of beep by
Diff: beep2.cpp
- Revision:
- 5:a844c1579d27
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/beep2.cpp Fri Jan 24 09:47:13 2014 +0000 @@ -0,0 +1,73 @@ +#include "beep2.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(p21); + * + * 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, float dc ) { + + _pwm.period(1.0/freq); + _pwm.write(dc); // 50% duty cycle - beep on + toff.attach(this,&Beep::nobeep, time); // time to off +} +void Beep::beepNoStop(float freq, float dc ) { + + _pwm.period(1.0/freq); + _pwm.write(dc); // 50% duty cycle - beep on + +} + +void Beep::changeDc(float dc ) { + static float lastdc; + + + if ( lastdc != dc){ + _pwm.write(dc); + } + + lastdc = dc; + +} + +