Revision 0:3eb39e374fc3, committed 2013-07-31

Comitter:

shimniok

Date:

Wed Jul 31 23:05:44 2013 +0000

Commit message:

Working version with dual sharp rangers and A2D I2C adapters

Changed in this revision

--- /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
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Beep.h	Wed Jul 31 23:05:44 2013 +0000
@@ -0,0 +1,49 @@
+#ifndef MBED_BEEP_H
+#define MBED_BEEP_H
+
+#include "mbed.h"
+
+/** Generates a tone 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 at 2kHz for 0.5 seconds
+ * #include "mbed.h"
+ * #include "Beep.h"
+ * 
+ * Beep buzzer(p21);
+ * 
+ * int main() {
+ *        ...
+ *   buzzer.beep(2000,0.5);    
+ *       ...
+ * }
+ * @endcode
+ */
+class Beep {
+
+public:
+
+/** Create a Beep object connected to the specified PwmOut pin
+ *
+ * @param pin PwmOut pin to connect to 
+ */
+    Beep(PinName pin);
+
+/** 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(float frequency, float time=0);
+
+/** stop the beep instantaneously. Not typically needed, but here just in case
+ */
+    void nobeep();
+
+private :
+    PwmOut _pwm;
+    Timeout toff;
+};
+#endif