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  • sdiy/rp2040-chord-vco
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Commits on Source (3)
  • David Huss's avatar
    Code cleanup and refactoring · 43433993
    David Huss authored 
    This should functionally change nothing, but:

- makes code formatting, use of spaces and so on more consistent
- fixes some wrongly indented parts of the code
- renames some functions and variable to have them more cleary describe
  their purose
- adds some comments and move others around
- move all IO/Pins into #define variables that can be seen on top
- factor some parts of the code out into functions to make the loop more
  concise
    43433993
  • David Huss's avatar
    Export Schematic to PDF · 960c3f31
    David Huss authored
    960c3f31
  • David Huss's avatar
    Add ipython notebook for waveform visualization · 90ba64ae
    David Huss authored
    90ba64ae
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Soft/Rp2040/Rp2040.ino
View file @ 90ba64ae
#include <hardware/pwm.h>
float osc_progress[6];//0~4=chord osc , 5=bass osc , 6=arpeggio osc
#define MODESWITCH_PIN_A 0
#define MODESWITCH_PIN_B 1
#define PUSHBUTTON_PIN 6
#define VOCT_PIN 26
#define FREQ_POT_PIN 27
#define INVERSION_PIN 28
#define CHORD_POT_PIN 29
// 0-4=chord osc , 5=bass osc , 6=arpeggio osc
float osc_progress[6];
int osc_inverse[4];
float osc_scale_rate[5]; // 0~3=chord osc , 6=arpeggio osc
int slice_num = 0;
......@@ -8,7 +16,7 @@ float osc_freq = 0;
int wavetable[256]; // 1024 resolution , 256 rate
float calb = 1.11; // calibration for reduce resistance error
int adc, freq_pot;
int waveform = 0;
int waveform_selection = 0;
int f0 = 35; // base osc frequency
int j = 0;
......@@ -20,19 +28,22 @@ bool push_sw, old_push_sw;//push sw
int qnt[32];
int thr=0; // threshold number
const static int majqnt[32]={// major scale quantize value
// Quantization values for the Major Scale
const static int majqnt[32]={
0, 34, 68, 85, 119, 153, 205, 239, 273, 290, 324, 358, 409, 443, 477, 494, 529, 563, 614, 648, 682, 699, 733, 767, 818, 853, 887, 904, 938, 972, 1023
};
const static int majthr[32]={// major scale quantize threshold
// Quantizer Threshold values for the Major Scale
const static int majthr[32]={
0, 17, 51, 85, 102, 136, 171, 222, 256, 290, 307, 341, 375, 426, 460, 494, 512, 546, 580, 631, 665, 699, 716, 750, 784, 835, 870, 904, 921, 955, 989,1024
};
const static int minqnt[32]={// minor scale quantize value
// Quantization values for the Minor Scale
const static int minqnt[32]={
0, 34, 51, 85, 119, 136, 205, 239, 256, 290, 324, 341, 409, 443, 460, 494, 529, 546, 614, 648, 665, 699, 733, 750, 818, 853, 870, 904, 938, 955, 1023
};
const static int minthr[32]={// minor scale quantize threshold
// Quantizer Threshold values for the Minor Scale
const static int minthr[32]={
17, 43, 68, 102, 128, 171, 222, 248, 273, 307, 333, 375, 426, 452, 477, 512, 538, 580, 631, 657, 682, 716, 742, 784, 836, 862, 887, 921, 947, 989, 1024
};
......@@ -81,15 +92,18 @@ float freq_table[2048];
void setup1() {
}
void setup()
{
//Serial.begin(9600);//for development
pinMode(0, INPUT_PULLUP);//mode select
pinMode(1, INPUT_PULLUP);//mode select
pinMode(6, INPUT_PULLUP);//push sw
void setup() {
// Mode select switch is a On-Off-On switch with the outer pins connected
// to the pins 0 and 1.
pinMode(MODESWITCH_PIN_A, INPUT_PULLUP);
pinMode(MODESWITCH_PIN_B, INPUT_PULLUP);
// Push Button
pinMode(PUSHBUTTON_PIN, INPUT_PULLUP);//push sw
table_set();//set wavetable
qnt_set();
// Create the waveform and put it into the wavetable
wavetable_populate();
quantizer_select();
//-------------------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]));
......@@ -107,16 +121,16 @@ void setup()
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, 4);//=sysclock/((resolution+1)*frequency)
pwm_set_wrap(slice_num, 1023);//resolutio
// Set PWM frequency
pwm_set_clkdiv(slice_num, 4);
pwm_set_wrap(slice_num, 1023); // Resolution
pwm_set_enabled(slice_num, true); // PWM output enable
}
// Timer that pushes out the actual audio.
void on_pwm_wrap() {
pwm_clear_irq(slice_num);
// if(select_mode!=2){
if (chord_mode == 2 || chord_mode == 3 || chord_mode == 4) {
osc_progress[0] = osc_progress[0] + osc_freq * osc_scale_rate[0];
osc_progress[1] = osc_progress[1] + osc_freq * osc_scale_rate[1];
......@@ -142,45 +156,39 @@ for(byte i = 0; i < 6; i++){
if (select_mode != 2){
if ((chord_mode==2 || chord_mode==3 || chord_mode==4) && select_mode == 0) {
pwm_set_chan_level(slice_num, PWM_CHAN_A, wavetable[(int)osc_progress[0]]/4+wavetable[(int)osc_progress[1]]/4+wavetable[(int)osc_progress[3]]/4+511);
}
else if((chord_mode==2 ||chord_mode==3 ||chord_mode==4)&& select_mode==1){
} else if ((chord_mode == 2 ||chord_mode == 3 ||chord_mode == 4) && select_mode == 1) {
pwm_set_chan_level(slice_num, PWM_CHAN_A, wavetable[(int)osc_progress[0]]/4+wavetable[(int)osc_progress[1]]/4+wavetable[(int)osc_progress[2]]/4+wavetable[(int)osc_progress[4]]/4+511);
}
else if((chord_mode==0 ||chord_mode==1||chord_mode==5) && select_mode==0){
} else if ((chord_mode == 0 || chord_mode == 1|| chord_mode == 5) && select_mode == 0) {
pwm_set_chan_level(slice_num, PWM_CHAN_A, wavetable[(int)osc_progress[0]]/5+wavetable[(int)osc_progress[1]]/5+wavetable[(int)osc_progress[2]]/5+wavetable[(int)osc_progress[3]]/5+511);
}
else if((chord_mode==0 ||chord_mode==1||chord_mode==5) && select_mode==1){
} else if ((chord_mode == 0 || chord_mode == 1|| chord_mode == 5) && select_mode == 1) {
pwm_set_chan_level(slice_num, PWM_CHAN_A, wavetable[(int)osc_progress[0]]/5+wavetable[(int)osc_progress[1]]/5+wavetable[(int)osc_progress[2]]/5+wavetable[(int)osc_progress[3]]/5+wavetable[(int)osc_progress[4]]/5+511);
}
}
else if(select_mode==2){
} else if (select_mode == 2){
pwm_set_chan_level(slice_num, PWM_CHAN_A, wavetable[(int)osc_progress[5]]/2+511);
}
}
void loop()
{
void loop() {
old_push_sw = push_sw;
// -------------------frequeny calculation-------------------------------
adc = analogRead(26) * calb;//Correct resistance errors
qnt_set();
freq_pot = map(analogRead(27), 0, 1023, 0, 127);
adc = analogRead(VOCT_PIN) * calb; // Correct resistance errors
quantizer_select();
freq_pot = map(analogRead(FREQ_POT_PIN), 0, 1023, 0, 127);
osc_freq = freq_table[qnt[thr] + freq_pot]; // V/oct apply
osc_freq = 256 * osc_freq / 122070 * 8;//7 is base octave
Serial.print(analogRead(26));//for development
Serial.print(",");//for development
Serial.print(adc);//for development
Serial.println("");//for development
Serial.print(analogRead(VOCT_PIN));
Serial.print(",");
Serial.print(adc);
Serial.println("");
// -------------------chord mode select-------------------------------
chord_mode = analogRead(29)/171;//171=1023/6 , 6 is amount of chord mode
chord_mode = analogRead(CHORD_POT_PIN)/171; //171=1023/6 , 6 is amount of chord mode
// ---------------------inversion---------------------
old_invAD = new_invAD; // countermeasure of noise
new_invAD=analogRead(28);
new_invAD = analogRead(INVERSION_PIN);
if (abs(old_invAD-new_invAD)<4){//countermeasure of noise
new_invAD = old_invAD;
}
......@@ -338,22 +346,13 @@ switch(chord_mode){
case 5:
select_table = 2;//4 chord
break;
}
//----------------------mode select-----------------
if (digitalRead(0) == 1 && digitalRead(1) == 1) {
select_mode = 1;//chord with bass
}
else if (digitalRead(0) == 0 && digitalRead(1) == 1) {
select_mode = 2;//arpeggio
}
else if (digitalRead(0) == 1 && digitalRead(1) == 0) {
select_mode = 0;//chord without bass
}
readModeSwitch();
if(chord_mode==2 ||chord_mode==3 ||chord_mode==4){//set each oscillator frequency
// Set each oscillator frequency
if (chord_mode == 2 || chord_mode == 3 || chord_mode == 4) {
osc_scale_rate[0] = freq_rate[chord_3[select_chord3[select_table][thr%6]][0]] * osc_inverse[0];
osc_scale_rate[1] = freq_rate[chord_3[select_chord3[select_table][thr%6]][1]] * osc_inverse[1];
osc_scale_rate[2] = freq_rate[chord_3[select_chord3[select_table][thr%6]][2]] * osc_inverse[2];
......@@ -366,18 +365,36 @@ if(chord_mode==0 ||chord_mode==1||chord_mode==5){
};
// -------------------push sw , change wavetable-------------------------------
push_sw = digitalRead(6);
push_sw = digitalRead(PUSHBUTTON_PIN);
// TODO: Add propper debouncing for the button here
if (push_sw == 0 && old_push_sw == 1) {//when push sw ON
waveform++;//change waveform
if (waveform > 7) {
waveform = 0;
// Change the selected waveform and ensure the selection is within bounds
waveform_selection = min(waveform_selection + 1, 6);
wavetable_populate();
}
table_set();
}
// Reads the mode switch, a tri-state On-Off-On toggle switch
// Assign the resulting mode to the select_mode variable
void readModeSwitch() {
bool left = digitalRead(MODESWITCH_PIN_A);
bool right = digitalRead(MODESWITCH_PIN_B);
if (left && right) {
// Chord with bass
select_mode = 1;
} else if (!left && right) {
// Arpreggio
select_mode = 2;
} else if (left && !right) {
// Chord without bass
select_mode = 0;
}
}
void qnt_set(){//quantize v/oct input
if(chord_mode==0 ||chord_mode==1 ||chord_mode==2||chord_mode==3){//major scale
// Select the quantization for the V/oct input
void quantizer_select(){
// Major Scale
if (chord_mode <= 3) {
for (j=0; j<31; j++) {
if (adc>=majthr[j] && adc<majthr[j+1]) {
thr = j;
......@@ -388,7 +405,8 @@ void qnt_set(){//quantize v/oct input
}
}
if(chord_mode==4 ||chord_mode==5){//minor scale
// Minor Scale
if (chord_mode >= 4) {
for (j=0; j<31; j++) {
if (adc>=minthr[j] && adc<minthr[j+1]) {
thr = j;
......@@ -400,55 +418,64 @@ void qnt_set(){//quantize v/oct input
}
}
void table_set() {//make wavetable
switch (waveform) {
// Populate the wavetable with values
void wavetable_populate() {
switch (waveform_selection) {
// Sawtooth wave
case 0:
for (int i = 0; i < 256; i++) { //saw
for (int i = 0; i < 256; i++) {
wavetable[i] = i * 4 - 512;
}
break;
// Sine wave
case 1:
for (int i = 0; i < 256; i++) { //sin
for (int i = 0; i < 256; i++) {
wavetable[i] = (sin(2 * M_PI * i / 256)) * 511;
}
break;
// Square Wave
case 2:
for (int i = 0; i < 128; i++) { //squ
for (int i = 0; i < 128; i++) {
wavetable[i] = 511;
wavetable[i + 128] = -511;
}
break;
// Triangle wave
case 3:
for (int i = 0; i < 128; i++) { //tri
for (int i = 0; i < 128; i++) {
wavetable[i] = i * 8 - 511;
wavetable[i + 128] = 511 - i * 8;
}
break;
// Octave-Sawtooth wave
case 4:
for (int i = 0; i < 128; i++) { //oct saw
for (int i = 0; i < 128; i++) {
wavetable[i] = i * 4 - 512 + i * 2;
wavetable[i + 128] = i * 2 - 256 + i * 4;
}
break;
// FM1 Wave
case 5:
for (int i = 0; i < 256; i++) { //FM1
for (int i = 0; i < 256; i++) {
wavetable[i] = (sin(2 * M_PI * i / 256 + sin(2 * M_PI * 3 * i / 256)) ) * 511;
}
break;
// FM2 Wave
case 6:
for (int i = 0; i < 256; i++) { //FM2
for (int i = 0; i < 256; i++) {
wavetable[i] = (sin(2 * M_PI * i / 256 + sin(2 * M_PI * 7 * i / 256))) * 511;
}
break;
// FM3 Wave
case 7:
for (int i = 0; i < 256; i++) { //FM3
for (int i = 0; i < 256; i++) {
wavetable[i] = (sin(2 * M_PI * i / 256 + sin(2 * M_PI * 4 * i / 256 + sin(2 * M_PI * 11 * i / 256)))) * 511;
}
break;
......
bom.ods 0 → 100644
View file @ 90ba64ae
File added
schematic.pdf 0 → 100644
View file @ 90ba64ae
File added
waveforms.ipynb 0 → 100644
View file @ 90ba64ae
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