Make noise with a piezo buzzer. Use a pwm pin.
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Revision 4:d8e14429a95f, committed 2012-09-11
- Comitter:
- dreschpe
- Date:
- Tue Sep 11 08:21:45 2012 +0000
- Parent:
- 3:5a8242af60ba
- Commit message:
- change beep.c to beep.cpp to avoid compiler problems
Changed in this revision
beep.c | Show diff for this revision Revisions of this file |
beep.cpp | Show annotated file Show diff for this revision Revisions of this file |
diff -r 5a8242af60ba -r d8e14429a95f beep.c --- a/beep.c Wed Feb 02 22:38:30 2011 +0000 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,56 +0,0 @@ -#include "beep.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) { - - _pwm.period(1.0/freq); - _pwm.write(0.5); // 50% duty cycle - beep on - toff.attach(this,&Beep::nobeep, time); // time to off -} - - - -
diff -r 5a8242af60ba -r d8e14429a95f beep.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/beep.cpp Tue Sep 11 08:21:45 2012 +0000 @@ -0,0 +1,56 @@ +#include "beep.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) { + + _pwm.period(1.0/freq); + _pwm.write(0.5); // 50% duty cycle - beep on + toff.attach(this,&Beep::nobeep, time); // time to off +} + + + +