45 lines
1.5 KiB
C++
45 lines
1.5 KiB
C++
|
#include <Arduino.h>
|
||
|
|
#include "notes.h"
|
||
|
|
|
||
|
|
const char *NoteNames[] {
|
||
|
|
"C ", "C#", "D ", "Eb", "E ", "F ", "F#", "G ", "Ab", "A ", "Bb", "B ",
|
||
|
|
};
|
||
|
|
float JustPitches[MaxNote + 1];
|
||
|
|
|
||
|
|
// Hat tip to Kyle Gann
|
||
|
|
// https://www.kylegann.com/tuning.html
|
||
|
|
void setupJustPitches(uint8_t baseNote, float basePitch) {
|
||
|
|
JustPitches[baseNote + 0] = basePitch * 1 / 1; // D
|
||
|
|
JustPitches[baseNote + 1] = basePitch * 16 / 15; // Eb
|
||
|
|
JustPitches[baseNote + 2] = basePitch * 9 / 8; // E
|
||
|
|
JustPitches[baseNote + 3] = basePitch * 6 / 5; // F
|
||
|
|
JustPitches[baseNote + 4] = basePitch * 5 / 4; // F#
|
||
|
|
JustPitches[baseNote + 5] = basePitch * 4 / 3; // G
|
||
|
|
JustPitches[baseNote + 6] = basePitch * 45 / 32; // Ab
|
||
|
|
JustPitches[baseNote + 7] = basePitch * 3 / 2; // A
|
||
|
|
JustPitches[baseNote + 8] = basePitch * 8 / 5; // Bb
|
||
|
|
JustPitches[baseNote + 9] = basePitch * 5 / 3; // B
|
||
|
|
JustPitches[baseNote + 10] = basePitch * 9 / 5; // C
|
||
|
|
JustPitches[baseNote + 11] = basePitch * 15 / 8; // C#
|
||
|
|
|
||
|
|
// Two fourths up from the base pitch, so G major scale sounds right
|
||
|
|
JustPitches[baseNote + 11] = basePitch * 8 / 3; // C#
|
||
|
|
|
||
|
|
// Octaves
|
||
|
|
for (int note = baseNote; note < baseNote + 12; note++) {
|
||
|
|
for (int i = 1; i < 9; i++) {
|
||
|
|
int multiplier = 1<<i;
|
||
|
|
int shift = i*12;
|
||
|
|
int upNote = note + shift;
|
||
|
|
int dnNote = note - shift;
|
||
|
|
|
||
|
|
if (upNote <= MaxNote) {
|
||
|
|
JustPitches[upNote] = JustPitches[note] * multiplier;
|
||
|
|
}
|
||
|
|
if (dnNote >= 0) {
|
||
|
|
JustPitches[dnNote] = JustPitches[note] / multiplier;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|