File content as of revision 0:c743b6678d88:

// --- MySound.cpp ---
#include "MySound.h"

MySound::MySound(PinName out) : _out(out){

}

void MySound::play(char pn,int s, char l)
{
    double freq,f;
    float length ;
    int scale ;
    int begin;
      
    switch(l){
        case 'W':
            length = 4 ;
            break ;
        case 't':
            length = 3;
            break ;
        case 'D':
            length = 2 ;
            break;  
        case 'Q':
            length = 1;
            break;
        case 'q':
            length = 1.5;
            break;
        case 'E':
            length = 0.5;
            break;
        case 'S':
            length = 0.25;
            break;           
        case 'T':
            length = 0.125;
            break;
        default:
            length = 1;
    }

    switch(pn){
        case 'a':
            freq = 415.30469 ;
            break; 
        case 'A':
            freq = 440.0;
            break ;
        case 'b':
            freq = 466.16876;
            break;
        case 'B':
            freq = 493.88330;
            break ;
        case 'C':
            freq = 261.62556;
            break ;
        case 'd':
            freq = 277.18263;
            break ;
        case 'D':
            freq = 293.66476;
            break;
        case 'e':
            freq = 311.12698;
            break ;
        case 'E':
            freq = 329.62755;
            break ;
        case 'F':
            freq = 349.22823;
            break;
        case 'g':
            freq = 369.99442;
            break ;
        case 'G':
            freq = 391.99543;
            break ;                                          
        case 'R':
            freq = 0.0;
            break ;                                                  
        default:
            freq = 440;
    }
    
    switch ( s ){
        case 6:
            f = freq * 4 ;
            break;
        case 5:
            f = freq * 2 ;
            break;
        case 4:
            f = freq;
            break;
        case 3: 
            f = freq / 2 ;
            break;
        case 2:
            f = freq / 4;
            break; 
        default:
            f = freq ;
        break ;
    }

    scale = (int)((1.0/f)*1e6) ;
    _out.period_us(scale);

    t.start();
    begin = t.read_ms() ;
    if ( pn != 'R' ){
        while(t.read_ms()-begin < (int)(500 * length) ){
            _out.write(0.5f);    
        }
    }else{
        while(t.read_ms()-begin < (int)(500 * length) ){
            _out.write(0.0f);    
        }    
    }
    t.stop();
    t.reset();
}