uilleann/notes.cpp

42 lines
1.4 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 * 16 / 9; // C (fourth up from G)
JustPitches[baseNote + 11] = basePitch * 15 / 8; // 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;
}
}
}
}