File content as of revision 0:c84a78a490d0:

#include "mbed.h"

PwmOut speaker(p26);
AnalogIn pot1(p19);
AnalogIn pot2(p20);
DigitalIn joystickCenter(p14);

int main() {
    /* note frequencies in Hz
    * rows: C C# D Eb E F F# G G# A Bb B
    * columns: 0 1 2 3 4 5 6 7 8
    */
    enum noteNames {C, Cs, D, Eb, E, F, Fs, G, Gs, A, Bb, B};
    float nt[12][9] = { {16.35}, {17.32}, {18.35}, {19.45}, {20.60}, {21.83},
                        {23.12}, {24.5}, {25.96}, {27.5}, {29.14}, {30.87} };
    for (int i = 0; i < 12; i++) 
        for (int j = 1; j < 9; j++) 
            nt[i][j] = nt[i][j-1] * 2;
    
    while(1) {
        int scale = pot2 * 8;
        float speed = 0.05 + pot1; // minimum wait is 50 ms
        float notesCiciban[] = {nt[G][scale], 0, nt[G][scale], 0, nt[E][scale], 0,
                                nt[G][scale], 0, nt[G][scale], 0, nt[E][scale], 0,
                                nt[G][scale], 0, nt[G][scale], 0, nt[E][scale], 0, nt[E][scale], 0,
                                nt[G][scale], 0, nt[E][scale], 0, nt[C][scale], 0};
        float beatCiciban[] =  {1, 0.5, 1, 0.5, 2, 0.5,
                                1, 0.5, 1, 0.5, 2, 0.5,
                                1, 0.5, 1, 0.5, 1, 0.5, 1, 0.5,
                                1, 0.5, 1, 0.5, 2, 5};
    
        for (int i = 0; i < 26; i++) {
            speaker.period(1 / notesCiciban[i]);
            speaker = 0.5;
            wait(speed * beatCiciban[i]);
        }
        if (joystickCenter) // press joystick center to stop playing
            break;
    }
}