beep.cpp

00001 #include "beep.h"
00002 #include "mbed.h"
00003 
00004 /** class to make sound with a buzzer, based on a PwmOut
00005  *   The class use a timeout to switch off the sound  - it is not blocking while making noise
00006  *
00007  * Example:
00008  * @code
00009  * // Beep with 1Khz for 0.5 seconds
00010  * #include 'mbed.h'
00011  * #include 'beep.h'
00012  * 
00013  * Beep buzzer(p21);
00014  * 
00015  * int main() {
00016  *       ...
00017  *   buzzer.beep(1000,0.5);    
00018  *       ...
00019  * }
00020  * @endcode
00021  */
00022 
00023 //using namespace mbed;
00024  // constructor
00025  /** Create a Beep object connected to the specified PwmOut pin
00026   *
00027   * @param pin PwmOut pin to connect to 
00028   */
00029     
00030 Beep::Beep(PinName pin) : _pwm(pin) {
00031     _pwm.write(0.0);     // after creating it have to be off
00032 }
00033 
00034  /** stop the beep instantaneous 
00035   * usually not used 
00036   */
00037 void Beep::nobeep() {
00038     _pwm.write(0.0);
00039 }
00040 
00041 /** Beep with given frequency and duration.
00042  *
00043  * @param frequency - the frequency of the tone in Hz
00044  * @param time - the duration of the tone in seconds
00045  */
00046      
00047 void Beep::beep(float freq, float time) {
00048 
00049     _pwm.period(1.0/freq);
00050     _pwm.write(0.5);            // 50% duty cycle - beep on
00051     toff.attach(this,&Beep::nobeep, time);   // time to off
00052 }
00053 
00054 #define NOTE_GB 0
00055 #define NOTE_EB 1
00056 #define NOTE_FS 2
00057 
00058 void Beep::play(char note) {
00059     if (note=='a') {
00060         beep(880,0.1);
00061     }
00062     if (note=='b') {
00063         beep(987,0.1);
00064     }
00065     if (note=='c') {
00066         beep(1024,0.1);
00067     }
00068     if (note=='d') {
00069         beep(1175,0.1);
00070     }
00071     if (note=='e') {
00072         beep(1319,0.1);
00073     }
00074     if (note=='f') {
00075         beep(1397,0.1);
00076     }
00077     if (note=='g') {
00078         beep(1568,0.1);
00079     }
00080 
00081     if (note==NOTE_GB) {
00082         beep(830,0.1);
00083     }
00084     if (note==NOTE_EB) {
00085         beep(659,0.1);
00086     }
00087     if (note==NOTE_FS) {
00088         beep(1480,0.1);
00089     }
00090     if (note=='w') {
00091         wait(0.05);
00092     }
00093     wait (0.2); //wait while the note plays.
00094 }
00095 
00096 void Beep::popcorn() {
00097 
00098     play('e');
00099     play('d');
00100     play('e');
00101     play('c');
00102     play(NOTE_GB);
00103     play('c');
00104     play(NOTE_EB);
00105     play('w');
00106     play('e');
00107     play('d');
00108     play('e');
00109     play('c');
00110     play(NOTE_GB);
00111     play('c');
00112     play(NOTE_EB);
00113     play('w');
00114     play('e');
00115     play(NOTE_FS);
00116     play('g');
00117     play(NOTE_FS);
00118     play('g');
00119     play('e');
00120     play(NOTE_FS);
00121     play('e');
00122     play(NOTE_FS);
00123     play('d');
00124     play('e');
00125     play('d');
00126     play('e');
00127     play('d');
00128     play('e');
00129     play('w');
00130     play('e');
00131     play('d');
00132     play('e');
00133     play('c');
00134     play(NOTE_GB);
00135     play('c');
00136     play(NOTE_EB);
00137     play('w');
00138     play('e');
00139     play('d');
00140     play('e');
00141     play('c');
00142     play(NOTE_GB);
00143     play('c');
00144     play(NOTE_EB);
00145     play('w');
00146     play('e');
00147     play(NOTE_FS);
00148     play('g');
00149     play(NOTE_FS);
00150     play('g');
00151     play('e');
00152     play(NOTE_FS);
00153     play('e');
00154     play(NOTE_FS);
00155     play('d');
00156     play('e');
00157     play('d');
00158     play('e');
00159     play('d');
00160     play('g');
00161 
00162 }
00163