Beeper.cpp

00001 #include "Beeper.h"
00002 #include "mbed.h"
00003 
00004 using namespace mbed;
00005 
00006 Beeper::Beeper(PinName pin) 
00007   : _pwm(pin){}    
00008 
00009 
00010 void Beeper::beep(float freq, float time){
00011 
00012     _pwm.period(1.0/freq);
00013     _pwm.write(0.5);
00014     //wait(time);
00015     //_pwm.write(0.0);
00016 }
00017 void Beeper::stop() {
00018 _pwm.write(0.0);
00019 }
00020 
00021 
00022     
00023 const float MIDINote[128] = {
00024 8.175798916,8.661957218,9.177023997,9.722718241,10.30086115,10.91338223,11.56232571,12.24985737,12.9782718,13.75,14.56761755,15.43385316,
00025 16.35159783,17.32391444,18.35404799,19.44543648,20.60172231,21.82676446,23.12465142,24.49971475,25.9565436,27.5,29.13523509,30.86770633,
00026 32.70319566,34.64782887,36.70809599,38.89087297,41.20344461,43.65352893,46.24930284,48.9994295,51.9130872,55.0,58.27047019,61.73541266,
00027 65.40639133,69.29565774,73.41619198,77.78174593,82.40688923,87.30705786,92.49860568,97.998859,103.8261744,110.0,116.5409404,123.4708253,
00028 130.8127827,138.5913155,146.832384,155.5634919,164.8137785,174.6141157,184.9972114,195.997718,207.6523488,220.0,233.0818808,246.9416506,
00029 261.6255653,277.182631,293.6647679,311.1269837,329.6275569,349.2282314,369.9944227,391.995436,415.3046976,440.0,466.1637615,493.8833013,
00030 523.2511306,554.365262,587.3295358,622.2539674,659.2551138,698.4564629,739.9888454,783.990872,830.6093952,880.0,932.327523,987.7666025,
00031 1046.502261,1108.730524,1174.659072,1244.507935,1318.510228,1396.912926,1479.977691,1567.981744,1661.21879,1760.0,1864.655046,1975.533205,
00032 2093.004522,2217.461048,2349.318143,2489.01587,2637.020455,2793.825851,2959.955382,3135.963488,3322.437581,3520.0,3729.310092,3951.06641,
00033 4186.009045,4434.922096,4698.636287,4978.03174,5274.040911,5587.651703,5919.910763,6271.926976,6644.875161,7040.0,7458.620235,7902.132835,
00034 8372.01809,8869.844191,9397.272573,9956.063479,10548.08182,11175.30341,11839.82153,12543.85395
00035 };
00036  
00037 void Beeper::note(int note, float time){
00038     
00039     if ((note > -1) && (note <128)){
00040         _pwm.period(1.0/MIDINote[note]);
00041         _pwm.write(0.5);
00042         wait(time);
00043         _pwm.write(0.0);}
00044         
00045 }