Diff: Buzzer.h

Revision:

0:c18c119011ec

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Buzzer.h	Mon Nov 21 06:40:27 2016 +0000
@@ -0,0 +1,85 @@
+/******************** (C) COPYRIGHT 2016 Delta Electronics, Inc. ***************
+*
+* File Name : Buzzer.h
+* Authors   : Tsungta Wu - CPBG (tsungta.wu@deltaww.com)
+* Version   : V.1.0.1
+* Date      : 2016/Nov/14
+*
+*******************************************************************************/
+
+/** class to make sound and play melody with a buzzer using PWM
+ *   The class use a timer to change tone  - it is not blocking while playing melody
+ *
+ * Example:
+ * @code
+ * #include "mbed.h"
+ * #include "Buzzer.h"
+ * 
+ * Buzzer buzzer(p21);
+ * 
+ *#define tone_num   5
+ *float tone[tone_num] = {262, 294, 330, 349, 392};
+
+ * int main() {
+ *       ...
+ *   buzzer.simpleBeep(1000,0.5);   //beep frequency at 1KHz for 0.5 second    
+ *       ...
+ *   buzzer.playMelody(tone, tone_num, 0.5);    //play do re mi fa so change tone every 0.5 second
+ *       ...
+ * }
+ * @endcode
+ */
+
+#ifndef MBED_BUZZER_H
+#define MBED_BUZZER_H
+
+#include "mbed.h"
+
+namespace mbed {
+
+/* Class: Buzzer
+ *  A class witch uses PwmOut to play sounds.
+ *  The class use a timer to change tone  - it is not blocking
+ */
+class Buzzer {
+
+public:
+
+/** Create a Buzzer object connected to the specified GPIO pin
+ *
+ * @param pin GPIO pin to connect to
+ * @param debug GPIO uart tx pin used to print debug message (reserved)  
+ */
+    Buzzer (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 simpleBeep (float frequency, float time);
+
+/** Play melody with given frequency and interval.
+ *
+ * @param tone_freq - the frequency of each tone in Hz
+ * @param tone_num - the total number of the given tones
+ * @param tone_time - the duration of each tone in seconds
+ */
+    void playMelody (float* tone_freq, uint16_t tone_num,float tone_time);
+    
+/** stop the Buzzer instantaneous 
+ * usually not used 
+ */
+    void stopBuzzer();
+    
+private :
+
+    void nextTone();
+    PwmOut _pwm;
+    Timeout tnext;
+    PinName _debug;
+};
+
+}
+#endif
+