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seed_vco_fm_led_pwm.ino
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seed_vco_fm_led_pwm.ino
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//
// removing wave mod in favour of FM
//
#include <hardware/pwm.h>
#include <Adafruit_NeoPixel.h>
int k = 1;
float AM_mod = 1;//AM modulation rate
float f = 0;
int slice_num = 0;
float osc_freq = 0;
bool push_sw, old_push_sw;//push sw
float mod = 0;
int wavetable[256];//1024 resolution , 256 rate
float mod_wavetable[256];//1st modulated wavetable
int mod2_wavetable[256];//2nd modulated wavetable
float calb = 1.142; //calibration for reduce resistance error
int adc, freq_pot, fm_input, oct_sw, mode;
int waveform = 0;
//int f0 = 35;//base osc frequency
int f0 = 44;//base osc frequency
long timer = 0;//use for making AM sinewave
const static float voctpow[1230] = {//Covers 6(=1230) octaves. If it is 1230 or more, the operation becomes unstable.
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1.484375, 1.489257, 1.49414, 1.499023, 1.503906, 1.508789, 1.513671, 1.518554, 1.523437, 1.52832, 1.533203, 1.538085, 1.542968, 1.547851, 1.552734, 1.557617, 1.5625, 1.567382, 1.572265, 1.577148, 1.582031, 1.586914, 1.591796, 1.596679, 1.601562, 1.606445, 1.611328, 1.61621, 1.621093, 1.625976, 1.630859, 1.635742, 1.640625, 1.645507, 1.65039, 1.655273, 1.660156, 1.665039, 1.669921, 1.674804, 1.679687, 1.68457, 1.689453, 1.694335, 1.699218, 1.704101, 1.708984, 1.713867, 1.71875, 1.723632, 1.728515, 1.733398, 1.738281, 1.743164, 1.748046, 1.752929, 1.757812, 1.762695, 1.767578, 1.77246, 1.777343, 1.782226, 1.787109, 1.791992, 1.796875, 1.801757, 1.80664, 1.811523, 1.816406, 1.821289, 1.826171, 1.831054, 1.835937, 1.84082, 1.845703, 1.850585, 1.855468, 1.860351, 1.865234, 1.870117, 1.875, 1.879882, 1.884765, 1.889648, 1.894531, 1.899414, 1.904296, 1.909179, 1.914062, 1.918945, 1.923828, 1.92871, 1.933593, 1.938476, 1.943359, 1.948242, 1.953125, 1.958007, 1.96289, 1.967773, 1.972656, 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4.443359, 4.448242, 4.453125, 4.458007, 4.46289, 4.467773, 4.472656, 4.477539, 4.482421, 4.487304, 4.492187, 4.49707, 4.501953, 4.506835, 4.511718, 4.516601, 4.521484, 4.526367, 4.53125, 4.536132, 4.541015, 4.545898, 4.550781, 4.555664, 4.560546, 4.565429, 4.570312, 4.575195, 4.580078, 4.58496, 4.589843, 4.594726, 4.599609, 4.604492, 4.609375, 4.614257, 4.61914, 4.624023, 4.628906, 4.633789, 4.638671, 4.643554, 4.648437, 4.65332, 4.658203, 4.663085, 4.667968, 4.672851, 4.677734, 4.682617, 4.6875, 4.692382, 4.697265, 4.702148, 4.707031, 4.711914, 4.716796, 4.721679, 4.726562, 4.731445, 4.736328, 4.74121, 4.746093, 4.750976, 4.755859, 4.760742, 4.765625, 4.770507, 4.77539, 4.780273, 4.785156, 4.790039, 4.794921, 4.799804, 4.804687, 4.80957, 4.814453, 4.819335, 4.824218, 4.829101, 4.833984, 4.838867, 4.84375, 4.848632, 4.853515, 4.858398, 4.863281, 4.868164, 4.873046, 4.877929, 4.882812, 4.887695, 4.892578, 4.89746, 4.902343, 4.907226, 4.912109, 4.916992, 4.921875, 4.926757, 4.93164, 4.936523, 4.941406, 4.946289, 4.951171, 4.956054, 4.960937, 4.96582, 4.970703, 4.975585, 4.980468, 4.985351, 4.990234, 4.995117, 5, 5.004882, 5.009765, 5.014648, 5.019531, 5.024414, 5.029296, 5.034179, 5.039062, 5.043945, 5.048828, 5.05371, 5.058593, 5.063476, 5.068359, 5.073242, 5.078125, 5.083007, 5.08789, 5.092773, 5.097656, 5.102539, 5.107421, 5.112304, 5.117187, 5.12207, 5.126953, 5.131835, 5.136718, 5.141601, 5.146484, 5.151367, 5.15625, 5.161132, 5.166015, 5.170898, 5.175781, 5.180664, 5.185546, 5.190429, 5.195312, 5.200195, 5.205078, 5.20996, 5.214843, 5.219726, 5.224609, 5.229492, 5.234375, 5.239257, 5.24414, 5.249023, 5.253906, 5.258789, 5.263671, 5.268554, 5.273437, 5.27832, 5.283203, 5.288085, 5.292968, 5.297851, 5.302734, 5.307617, 5.3125, 5.317382, 5.322265, 5.327148, 5.332031, 5.336914, 5.341796, 5.346679, 5.351562, 5.356445, 5.361328, 5.36621, 5.371093, 5.375976, 5.380859, 5.385742, 5.390625, 5.395507, 5.40039, 5.405273, 5.410156, 5.415039, 5.419921, 5.424804, 5.429687, 5.43457, 5.439453, 5.444335, 5.449218, 5.454101, 5.458984, 5.463867, 5.46875, 5.473632, 5.478515, 5.483398, 5.488281, 5.493164, 5.498046, 5.502929, 5.507812, 5.512695, 5.517578, 5.52246, 5.527343, 5.532226, 5.537109, 5.541992, 5.546875, 5.551757, 5.55664, 5.561523, 5.566406, 5.571289, 5.576171, 5.581054, 5.585937, 5.59082, 5.595703, 5.600585, 5.605468, 5.610351, 5.615234, 5.620117, 5.625, 5.629882, 5.634765, 5.639648, 5.644531, 5.649414, 5.654296, 5.659179, 5.664062, 5.668945, 5.673828, 5.67871, 5.683593, 5.688476, 5.693359, 5.698242, 5.703125, 5.708007, 5.71289, 5.717773, 5.722656, 5.727539, 5.732421, 5.737304, 5.742187, 5.74707, 5.751953, 5.756835, 5.761718, 5.766601, 5.771484, 5.776367, 5.78125, 5.786132, 5.791015, 5.795898, 5.800781, 5.805664, 5.810546, 5.815429, 5.820312, 5.825195, 5.830078, 5.83496, 5.839843, 5.844726, 5.849609, 5.854492, 5.859375, 5.864257, 5.86914, 5.874023, 5.878906, 5.883789, 5.888671, 5.893554, 5.898437, 5.90332, 5.908203, 5.913085, 5.917968, 5.922851, 5.927734, 5.932617, 5.9375, 5.942382, 5.947265, 5.952148, 5.957031, 5.961914, 5.966796, 5.971679, 5.976562, 5.981445, 5.986328, 5.99121, 5.996093, 6.000976,
};
float freq_table[2048];
Adafruit_NeoPixel pixel(1, 7, NEO_GRB + NEO_KHZ800);
int colour[][3] = { {100, 0, 0}, // red
{ 88, 12, 0}, // orange
{ 65, 35, 0}, // yellow
{ 0, 100, 0}, // green
{ 0, 70, 20}, // cyan
{ 0, 0, 100}, // blue
{ 40, 0, 40}, // magenta
{ 45, 40, 35} // white
};
void setup1() {
}
void setup()
{
pinMode(0, INPUT_PULLUP);//oct select
pinMode(1, INPUT_PULLUP);//oct select
pinMode(6, INPUT_PULLUP);//push sw
pinMode(3, INPUT_PULLUP);//mode select
pinMode(4, INPUT_PULLUP);//mode select
timer = micros();
table_set();//set wavetable
//-------------------octave select-------------------------------
for (int i = 0; i < 1230; i++) {//Covers 6(=1230) octaves. If it is 1230 or more, the operation becomes unstable.
freq_table[i] = f0 * pow(2, (voctpow[i]));
}
for (int i = 0; i < 2048 - 1230; i++) {
freq_table[i + 1230] = 6;
}
//-------------------PWM setting-------------------------------
gpio_set_function(2, GPIO_FUNC_PWM);// set GP2 function PWM
slice_num = pwm_gpio_to_slice_num(2);// GP2 PWM slice
pwm_clear_irq(slice_num);
pwm_set_irq_enabled(slice_num, true);
irq_set_exclusive_handler(PWM_IRQ_WRAP, on_pwm_wrap);
irq_set_enabled(PWM_IRQ_WRAP, true);
//set PWM frequency
pwm_set_clkdiv(slice_num, 1);//=sysclock/((resolution+1)*frequency)
pwm_set_wrap(slice_num, 1023);//resolutio
pwm_set_enabled(slice_num, true);//PWM output enable
pixel.begin();
pixel.setPixelColor(0, pixel.Color(colour[0][0], colour[0][1], colour[0][2]));
pixel.show();
}
void on_pwm_wrap() {
pwm_clear_irq(slice_num);
f = f + osc_freq;
if (f > 255) {
f = 0;
}
int k = (int)f;
pwm_set_chan_level(slice_num, PWM_CHAN_A, mod2_wavetable[k] + 511);
}
void loop()
{
old_push_sw = push_sw;
//-------------------octave select-------------------------------
if (digitalRead(0) == 1 && digitalRead(1) == 1) {
oct_sw = 1;
}
else if (digitalRead(0) == 0 && digitalRead(1) == 1) {
oct_sw = 3;
}
else if (digitalRead(0) == 1 && digitalRead(1) == 0) {
oct_sw = 0;
}
// -------------------mode select-------------------------------
if (digitalRead(4) == 1 && digitalRead(3) == 1) {
mode = 1;//fm
}
else if (digitalRead(4) == 0 && digitalRead(3) == 1) {
mode = 0;//AM
}
else if (digitalRead(4) == 1 && digitalRead(3) == 0) {
mode = 2;//wavefolder
}
// -------------------frequeny calculation-------------------------------
adc = analogRead(26) * calb;//Correct resistance errors
adc = constrain(adc , 0, 1225) ;//Covers 6(=1220) octaves. If it is 1230 or more, the operation becomes unstable.
freq_pot = map(analogRead(27), 0, 1023, 0, 127);
fm_input = map(analogRead(28), 0, 1023, 0, 63);
fm_input = fm_input - (1 << 5);
//Serial.println(fm_input);
osc_freq = freq_table[adc + freq_pot]; // V/oct apply
//osc_freq = 256 * (osc_freq) / 122070 * (1 + oct_sw);
osc_freq = 256 * (osc_freq + fm_input) / 122070 * (1 + oct_sw);
// -------------------mod parameter set-------------------------------
if (mode == 0) {//fold
if (2 != waveform) { // normal wavefold
mod = constrain(analogRead(29), 0, 1023) * 0.0036 + 0.90; //28 is CV , 29 is pot
} else { // PWM for square wave
mod = constrain(analogRead(29), 0, 1023) / 8;
}
}
else if (mode == 1) {//FM
mod = constrain(analogRead(29), 0, 1023) / 8;
}
else if (mode == 2) {//AM
mod = 1023 - constrain(analogRead(29), 0, 1023) ;
}
// -------------------push sw-------------------------------
push_sw = digitalRead(6);
if (push_sw == 0 && old_push_sw == 1) {//when push sw ON
waveform++;//change waveform
if (waveform > 7) {
waveform = 0;
}
if (mode == 0 || mode == 2) {
table_set();
}
// set the neopixel colour
pixel.clear();
pixel.setPixelColor(0, pixel.Color(colour[waveform][0], colour[waveform][1], colour[waveform][2]));
pixel.show();
}
//}
//void loop1() {//modulation
if (mode == 0) { // wavefold
if (2 == waveform) {
// PWM rather than wavefolding for square wave
for (int i = 0; i < 128 + mod; i++) {
mod2_wavetable[i] = 511;
}
for (int i = 128 + mod; i < 256; i++) {
mod2_wavetable[i] = -511;
}
} else {
for (int i = 0; i < 256; i++) {
mod_wavetable[i] = wavetable[i] * mod;
}
for (int i = 0; i < 256; i++) {
if (mod_wavetable[i] > 511 && mod_wavetable[i] < 1023 + 512) {
mod2_wavetable[i] = 1024 - mod_wavetable[i];
}
else if (mod_wavetable[i] < -512 && mod_wavetable[i] > -1024 - 512) {
mod2_wavetable[i] = -1023 - mod_wavetable[i];
}
else if (mod_wavetable[i] < -1024 - 511) {
mod2_wavetable[i] = 2048 + mod_wavetable[i];
}
else if (mod_wavetable[i] > 1023 + 511) {
mod2_wavetable[i] = -2047 + mod_wavetable[i];
}
else {
mod2_wavetable[i] = mod_wavetable[i] ;
}
}
}
}
else if (mode == 1) {//FM
switch (waveform) {
case 0:
for (int i = 0; i < 256; i++) { //FM1
mod2_wavetable[i] = (sin(2 * M_PI * i / 256 + mod / 128 * sin(2 * M_PI * 3 * i / 256)) ) * 511;
}
break;
case 1:
for (int i = 0; i < 256; i++) { //FM2
mod2_wavetable[i] = (sin(2 * M_PI * i / 256 + mod / 128 * sin(2 * M_PI * 3 * i / 256 + mod / 128 * sin(2 * M_PI * 3 * i / 256))) ) * 511;
}
break;
case 2:
for (int i = 0; i < 256; i++) { //FM3
mod2_wavetable[i] = (sin(2 * M_PI * i / 256 + mod / 128 * sin(2 * M_PI * 5 * i / 256 + mod / 128 * sin(2 * M_PI * 7 * i / 256))) ) * 511;
}
break;
case 3:
for (int i = 0; i < 256; i++) { //FM4
mod2_wavetable[i] = (sin(2 * M_PI * i / 256 + mod / 128 * sin(2 * M_PI * 9 * i / 256 + mod / 128 * sin(2 * M_PI * 5 * i / 256))) ) * 511;
}
break;
case 4:
for (int i = 0; i < 256; i++) { //FM5
mod2_wavetable[i] = ((sin(2 * M_PI * i / 256 + mod / 128 * sin(2 * M_PI * 19 * i / 256)) ) + (sin(2 * M_PI * 3 * i / 256 + mod / 128 * sin(2 * M_PI * 7 * i / 256)) )) / 2 * 511;
}
break;
case 5:
for (int i = 0; i < 256; i++) { //FM6
mod2_wavetable[i] = ((sin(2 * M_PI * i / 256 + mod / 128 * sin(2 * M_PI * 7 * i / 124)) ) + (sin(2 * M_PI * 9 * i / 368 + mod / 128 * sin(2 * M_PI * 11 * i / 256)) )) * 511;
}
break;
case 6:
for (int i = 0; i < 256; i++) { //FM7
mod2_wavetable[i] = ((sin(2 * M_PI * i / 256 + mod / 128 * sin(2 * M_PI * 13 * i / 256)) ) + (sin(2 * M_PI * 17 * i / 111 + mod / 128 * sin(2 * M_PI * 19 * i / 89)) )) * 511;
}
break;
case 7:
for (int i = 0; i < 256; i++) { //FM8
mod2_wavetable[i] = (sin(2 * M_PI * i / 256 + mod / 128 * sin(2 * M_PI * 11 * i / 124 + mod / 128 * sin(2 * M_PI * 7 * i / 333 + mod / 128 * sin(2 * M_PI * 9 * i / 56)))) ) * 511;
}
break;
}
}
else if (mode == 2) {//AM
if (timer + mod <= micros()) {
k++;
if (k > 63) {
k = 0;
}
AM_mod = sin( 2 * M_PI * k / 63);//make modulation sine wave
for (int i = 0; i < 255 ; i++) {
mod2_wavetable[i] = wavetable[i] * AM_mod;//multiply AM sine wave
}
timer = micros();
}
}
}
void table_set() {//make wavetable
if (mode == 0) { //wavefold
switch (waveform) {
case 0:
for (int i = 0; i < 256; i++) { //saw
wavetable[i] = i * 4 - 512;
}
break;
case 1:
for (int i = 0; i < 256; i++) { //sin
wavetable[i] = (sin(2 * M_PI * i / 256)) * 511;
}
break;
case 2:
for (int i = 0; i < 128; i++) { //squ
wavetable[i] = 511;
wavetable[i + 128] = -511;
}
break;
case 3:
for (int i = 0; i < 128; i++) { //tri
wavetable[i] = i * 8 - 511;
wavetable[i + 128] = 511 - i * 8;
}
break;
case 4:
for (int i = 0; i < 128; i++) { //oct saw
wavetable[i] = i * 4 - 512 + i * 2;
wavetable[i + 128] = i * 2 - 256 + i * 4;
}
break;
case 5:
for (int i = 0; i < 256; i++) { //FM1
wavetable[i] = (sin(2 * M_PI * i / 256 + sin(2 * M_PI * 3 * i / 256)) ) * 511;
}
break;
case 6:
for (int i = 0; i < 256; i++) { //FM2
wavetable[i] = (sin(2 * M_PI * i / 256 + sin(2 * M_PI * 7 * i / 256))) * 511;
}
break;
case 7:
for (int i = 0; i < 256; i++) { //FM3
wavetable[i] = (sin(2 * M_PI * i / 256 + sin(2 * M_PI * 4 * i / 256 + sin(2 * M_PI * 11 * i / 256)))) * 511;
}
break;
}
}
else if (mode == 2) { //AM
switch (waveform) {
case 0:
for (int i = 0; i < 256; i++) { //saw
wavetable[i] = (sin(2 * M_PI * i / 256)) * 511;
}
break;
case 1:
for (int i = 0; i < 256; i++) { //fm1
wavetable[i] = (sin(2 * M_PI * i / 256 + sin(2 * M_PI * 3 * i / 256)) ) * 511;
}
break;
case 2:
for (int i = 0; i < 256; i++) { //fm2
wavetable[i] = (sin(2 * M_PI * i / 256 + sin(2 * M_PI * 5 * i / 256)) ) * 511;
}
break;
case 3:
for (int i = 0; i < 256; i++) { //fm3
wavetable[i] = (sin(2 * M_PI * i / 256 + sin(2 * M_PI * 4 * i / 256 + sin(2 * M_PI * 11 * i / 256)))) * 511;
}
break;
case 4:
for (int i = 0; i < 256; i++) { //non-integer multiplets fm1
wavetable[i] = (sin(2 * M_PI * i / 256 + sin(2 * M_PI * 1.28 * i / 256)) ) * 511;
}
break;
case 5:
for (int i = 0; i < 256; i++) { //non-integer multiplets fm2
wavetable[i] = (sin(2 * M_PI * i / 256 + sin(2 * M_PI * 3.19 * i / 256)) ) * 511;
}
break;
case 6:
for (int i = 0; i < 256; i++) { //non-integer multiplets fm3
wavetable[i] = (sin(2 * M_PI * i / 256 + sin(2 * M_PI * 2.3 * i / 256 + sin(2 * M_PI * 7.3 * i / 256)))) * 511;
}
break;
case 7:
for (int i = 0; i < 256; i++) { //non-integer multiplets fm3
wavetable[i] = (sin(2 * M_PI * i / 256 + sin(2 * M_PI * 6.3 * i / 256 + sin(2 * M_PI * 11.3 * i / 256)))) * 511;
}
break;
}
}
}