mirror of
https://git.alemi.dev/cv-keyboard.git
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260 lines
No EOL
6.8 KiB
C++
260 lines
No EOL
6.8 KiB
C++
#define NOTEOffset 36
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#define drumOffset 60
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#define MINUTE 60000
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#define MIDICLOCK 0xf8
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#define MAXKEYS 48
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#define MAXDPAD 3
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#include <CapacitiveSensor.h>
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#include <MIDI.h>
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#include <HID.h>
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MIDI_CREATE_DEFAULT_INSTANCE();
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typedef struct SequencerStep* link;
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typedef struct OCTAVEStatus { // This struct is for an OCTAVE status. Each bool is for 1 NOTE
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bool stat[12];
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int nOct;
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} octst;
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typedef struct SequencerStep {
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int NOTE;
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bool kboard_s[MAXKEYS]
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bool dpad_s[MAXDPAD]
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link next;
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} step;
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// PIN DECLARATIONS
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int NOTE[12] = { // Pins used to read each note (C is 0, B is 11)
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22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44 };
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int OCTAVE[4] = { // Pins associated to each OCTAVE's contact bar
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12, 9, 8, 10 };
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int SEND[3] = { // Pins used as sender for capacitive touch buttons
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5, 4, 16 };
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int RECEIVE[3] = { // Pins used as receiver for capacitive touch buttons
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6, 3, 17 };
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int OW = 2; // Pin used for overwrite switch
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int DEL = -1; // Pin used for delete button
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int ADD = 14; // Pin used for add button
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// GLOBAL SETTINGS
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//bool overwrite; // Step content is overwritten with pressed keys, could not be needed
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// PLACEHOLDERS
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byte velocity = 100; //
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byte channel = 1; //
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int bpm = 360; //
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// SEQUENCER POINTERS
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link head, tail, current;
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// SYSTEM VARIABLES
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int nstep = 0; // Keeps track of the sequencer steps
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int arp = 0; // Keeps track of last played NOTE if arpeggiating
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int midiclock = 0; // Used to sync with MIDI clock
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int sem_beat = 0; // Basic semaphore used to sync with MIDI beat
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int sem_gate = 0; // Basic semaphore used for gate timing
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unsigned long last_gate = 0; // Gate start time for last sequencer step
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unsigned long gate_length = 200; // ms of keypress if arpeggiator
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bool dpadhit = LOW; // If any drum pad has been hit in this cycle, this is true
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int npressed; // Number of keys pressed, used to avoid doing anything when no keys are pressed
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bool kboard[MAXKEYS]; // Last status of keyboard
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bool dpad[MAXDPAD]; // Last status of Capacitive Buttons
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CapacitiveSensor* bCap[MAXDPAD];
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void setup() {
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for (int cOCTAVE = 0; cOCTAVE < 4; cOCTAVE++) {
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pinMode(OCTAVE[cOCTAVE], OUTPUT);
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}
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for (int cNOTE = 0; cNOTE < 12; cNOTE++) {
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pinMode(NOTE[cNOTE], INPUT);
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}
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for (int cButton = 0; cButton < MAXDPAD; cButton++) { // Capacitive Buttons configuration
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bCap[cButton] = new CapacitiveSensor(SEND[cButton], RECEIVE[cButton]); // Initialized
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bCap[cButton]->set_CS_AutocaL_Millis(0xFFFFFFFF); // No recalibration
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bCap[cButton]->set_CS_Timeout_Millis(200); // Timeout set to 200ms (instead of 2s)
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dpad[cButton] = LOW; // Button starts LOW
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}
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for (int cStat = 0; cStat < MAXKEYS; cStat++) kboard[cStat] = LOW; // All keyboard keys start LOW
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MIDI.begin(MIDI_CHANNEL_OFF);
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Serial.begin(115200);
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pinMode(2, INPUT_PULLUP); // Used for overwrite switch
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}
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void loop() {
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sync();
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if (sem_beat > 0) {
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sem_beat--;
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if (sem_gate > 0) { // If step was shorter than gate, close all open notes before next step
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sem_gate--;
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for (i=0; i<MAXKEYS; i++) if (current->kboard_s[c]) playNOTE(i, !current->kboard_s[c]);
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for (i=0; i<MAXDPAD; i++) if (current->dpad_s[c]) playDrum(i, !current->dpad_s[c]);
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}
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if (digitalRead(ADD) && digitalRead(OW)) insertStep();
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if (digitalRead(ADD) && !digitalRead(OW)) deleteStep(); // Placeholder because I miss a button
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nextStep();
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if (current != NULL) { // Play all step notes and begin counting for gate
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for (i=0; i<MAXKEYS; i++) if (current->kboard_s[c]) playNOTE(i, current->kboard_s[c]);
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for (i=0; i<MAXDPAD; i++) if (current->dpad_s[c]) playDrum(i, current->dpad_s[c]);
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last_gate = millis();
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sem_gate++;
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}
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}
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if (sem_gate > 0 && (millis() - last_gate) > gate_length) {
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sem_gate--;
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for (i=0; i<MAXKEYS; i++) if (current->kboard_s[c]) playNOTE(i, !current->kboard_s[c]);
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for (i=0; i<MAXDPAD; i++) if (current->dpad_s[c]) playDrum(i, !current->dpad_s[c]);
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}
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dpadhit = LOW;
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for (int cButton = 0; cButton < MAXDPAD; cButton++) {
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dpad[cButton] = evalButton(bCap[cButton], dpad[cButton], cButton);
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dpadhit = (dpad[cButton] || dpadhit)
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}
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npressed = 0;
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for (int cOCTAVE = 0; cOCTAVE < 4; cOCTAVE++) {
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digitalWrite(OCTAVE[cOCTAVE], HIGH);
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npressed += eval(scan(cOCTAVE));
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digitalWrite(OCTAVE[cOCTAVE], LOW);
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}
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if (digitalRead(OW)) {
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if (npressed > 0) current->kboard_s = kboard
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if (dpadhit) current->dpad_s = dpad
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}
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}
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// Hardware specific functions
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octst scan(int nOct) { // This function reads the 12 NOTE pins and returns a struct
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int c; // with 1 bool for each NOTE
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octst output;
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output.nOct = nOct;
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for (c = 0; c < 12; c++) {
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output.stat[c] = digitalRead(NOTE[c]);
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}
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return output;
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}
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bool evalButton(CapacitiveSensor* b, bool value, int note_number) {
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long sensor = b->capacitiveSensor(1);
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if (sensor > 15) {
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if (value) return HIGH;
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else {
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playDrum(note_number, HIGH);
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return HIGH;
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}
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}
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else {
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if (!value) return LOW;
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else {
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playDrum(note_number, LOW);
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return LOW;
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}
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}
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}
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// NOTE Functions
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int eval(octst input) {
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int pressed = 0;
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int sNOTE = input.nOct * 12;
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for (int c = 0; c < 12; c++) {
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if (input.stat[c] ^ kboard[c + sNOTE]) {
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playNOTE(c + sNOTE, input.stat[c]);
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kboard[c + sNOTE] = input.stat[c];
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}
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if (kboard[c + sNOTE] == HIGH) pressed++;
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}
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return pressed;
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}
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void playNOTE(int c, bool status) {
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byte n = c + NOTEOffset;
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if (status == HIGH) {
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MIDI.sendNOTEOn(n, velocity, channel);
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}
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else if (status == LOW) {
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MIDI.sendNOTEOff(n, velocity, channel);
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}
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}
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void playDrum(int c, bool status) {
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byte n = c + drumOffset;
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if (status == HIGH) {
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MIDI.sendNOTEOn(n, velocity, (byte)7);
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}
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else if (status == LOW) {
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MIDI.sendNOTEOff(n, velocity, (byte)7);
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}
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}
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// Sync functions
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void sync() {
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if (Serial.available() && Serial.read() == MIDICLOCK) {
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midiclock++;
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if (midiclock == 0 && sem_beat == 0) sem_beat++;
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else if (midiclock == 24) midiclock = 0;
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}
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}
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// List management functions
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link newStep() {
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return (link)malloc(sizeof(struct SequencerStep));
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}
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bool insertStep() {
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link newS = newStep();
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if (newS == NULL) {
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free(newS);
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return LOW;
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}
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newS->kboard_s = kboard;
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newS->dpad_s = dpad
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if (nstep == 0) {
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newS->next = newS;
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current = newS;
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head = newS;
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}
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else {
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newS->next = current->next;
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current->next = newS;
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}
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nstep++;
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return HIGH;
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}
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void nextStep() {
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current = current->next;
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}
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bool deleteStep() {
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if (nstep < 1) return LOW;
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if (nstep == 1) {
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free(current);
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head = NULL;
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current = NULL;
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}
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else {
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link buffer = current->next->next;
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free(current->next);
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current->next = buffer;
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}
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nstep--;
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return HIGH;
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} |