audio commit

FW/Leo_muziekdoos_fw/src/audio.h

@@ -3,5 +3,31 @@
 #include "Arduino.h"
 #include "board.h"
 
+#define SAMPLERATE_HZ 44100  // The sample rate of the audio.  Higher sample rates have better fidelity,
+                             // but these tones are so simple it won't make a difference.  44.1khz is
+                             // standard CD quality sound.
+
+#define AMPLITUDE     ((1<<29)-1)   // Set the amplitude of generated waveforms.  This controls how loud
+                             // the signals are, and can be any value from 0 to 2**31 - 1.  Start with
+                             // a low value to prevent damaging speakers!
+
+#define WAV_SIZE      256    // The size of each generated waveform.  The larger the size the higher
+                             // quality the signal.  A size of 256 is more than enough for these simple
+                             // waveforms.
+
+
+// Define the frequency of music notes (from http://www.phy.mtu.edu/~suits/notefreqs.html):
+#define C4_HZ      261.63
+#define D4_HZ      293.66
+#define E4_HZ      329.63
+#define F4_HZ      349.23
+#define G4_HZ      392.00
+#define A4_HZ      440.00
+#define B4_HZ      493.88
+
+// Define a C-major scale to play all the notes up and down.
+float scale[] = { C4_HZ, D4_HZ, E4_HZ, F4_HZ, G4_HZ, A4_HZ, B4_HZ, A4_HZ, G4_HZ, F4_HZ, E4_HZ, D4_HZ, C4_HZ };
+
+
 void initAudio(void);
 void handleAudio(void);