Diff: buzzer.cpp

Revision:

0:01eac446ef9f

Child:

2:857083873b09

diff -r 000000000000 -r 01eac446ef9f buzzer.cpp
--- /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
+}
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