mirror of
https://git.alemi.dev/cv-keyboard.git
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390 lines
No EOL
11 KiB
C++
390 lines
No EOL
11 KiB
C++
#include <CapacitiveSensor.h>
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#include <MIDI.h>
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#include <HID.h>
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#define BPQN 24 // Ableton sends 24, VCV rack only one, by standard should be 24?
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#define NOTEOffset 36
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#define DRUMSHIFT 6
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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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#define MAXSTEP 16
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#define NBITS 6
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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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bool clean = LOW;
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bool kboard_s[MAXKEYS];
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bool dpad_s[MAXDPAD];
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unsigned short stepnumber;
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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, 1, 17 };
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int LEDS[NBITS] = { // Pins used for leds
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15, 3, 21, 20, 19, 18 };
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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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int bpm = 360; //
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// SEQUENCER POINTERS AND RELATED ARRAYS
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link head[6];
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link current[6];
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link previous;
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unsigned short nstep[6]; // Keeps track of the sequencer steps
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bool mute[6];
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byte channel; // Current selected channel. Drums are shifted of DRUMSHIFT channels (so channels can only be 6)
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// SYSTEM VARIABLES
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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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bool add_step = LOW; // This is used to remember the addition of a step
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bool del_step = LOW; // This is used to remember the deletion of a step
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bool chan_up = LOW; // Only for now because I have few buttons :C
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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 = 1000; // 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++) pinMode(OCTAVE[cOCTAVE], OUTPUT);
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for (int cNOTE = 0; cNOTE < 12; cNOTE++) pinMode(NOTE[cNOTE], INPUT);
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for (int cLED = 0; cLED < NBITS; cLED++) pinMode(LEDS[cLED], OUTPUT);
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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(1); // Timeout set to 20ms (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); // Uncomment this if you use Hairless and set baud rate
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pinMode(OW, INPUT_PULLUP); // Used for overwrite switch
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pinMode(ADD, INPUT_PULLUP); // Used for overwrite switch
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for (int i = 0; i < 6; i++){
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current[i] = NULL;
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head[i] = NULL;
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nstep[i] = 0;
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mute[i] = LOW;
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}
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channel = (byte) 1;
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for (int i = 0; i < 64; i++) { // Boot up fancyness! NBITS*NBITS
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display(i);
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delay(50);
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}
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// ONLY FOR DEBUG
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for (int i=0; i<64; i++) insertStep((byte) 0);
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for (int i=0; i<32; i++) insertStep((byte) 1);
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for (int i=0; i<16; i++) insertStep((byte) 2);
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display(0);
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}
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void loop() {
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sync();
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// add_step = (add_step || !digitalRead(ADD));
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// del_step = (del_step || !digitalRead(DEL));
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chan_up = (chan_up || !digitalRead(ADD));
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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 (int chan = 0; chan < 6; chan++) {
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if (mute[chan]) continue;
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for (int i = 0; i < MAXKEYS; i++)
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if (current[chan]->kboard_s[i] && !kboard[i] && !current[chan]->next->kboard_s[i])
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playNote(i, !current[chan]->kboard_s[i], (byte) chan+1);
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for (int i = 0; i < MAXDPAD; i++)
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if (current[chan]->dpad_s[i] && !dpad[i])
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playDrum(i, !current[chan]->dpad_s[i], (byte) chan+1);
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}
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}
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if (add_step && !del_step) {
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add_step = LOW;
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if (nstep[channel-1] < MAXSTEP) insertStep(channel-1);
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}
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if (del_step && !add_step) {
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del_step = LOW;
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if (nstep[channel-1] < MAXSTEP) deleteStep(channel-1);
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}
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if (add_step && del_step) {
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add_step = LOW;
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del_step = LOW;
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}
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// ONLY FOR NOW because I don't have enough buttons :C
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if (chan_up) {
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chan_up = LOW;
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channel++;
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if (channel > 3) channel = (byte) 1;
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}
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nextStep(); // ALL STEPS INCREMENTED
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display(current[channel-1]->stepnumber);
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for (int chan = 0; chan < 6; chan++) {
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if (mute[chan]) continue;
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if (current[chan] != NULL) { // PLAY all step notes in all unmuted channels
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if (npressed < 1) // If the user is currently playing this step no note will play to avoid overruling (if monophonic)
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for (int i = 0; i < MAXKEYS; i++)
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if (current[chan]->kboard_s[i])
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playNote(i, current[chan]->kboard_s[i], (byte) chan+1);
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for (int i = 0; i < MAXDPAD; i++) // Drums are played nonetheless because drums already layered won't overrule
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if (current[chan]->dpad_s[i] && !dpad[i])
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playDrum(i, current[chan]->dpad_s[i], (byte) chan+1);
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}
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}
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last_gate = millis();
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sem_gate++;
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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 (int chan = 0; chan < 6; chan++) {
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if (mute[chan]) continue;
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for (int i = 0; i < MAXKEYS; i++)
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if (current[chan]->kboard_s[i] && !kboard[i])
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playNote(i, !current[chan]->kboard_s[i], (byte) chan+1);
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for (int i = 0; i < MAXDPAD; i++)
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if (current[chan]->dpad_s[i] && !dpad[i])
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playDrum(i, !current[chan]->dpad_s[i], (byte) chan+1);
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}
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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) for (int i = 0; i < MAXKEYS; i++)
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current[channel-1]->kboard_s[i] = kboard[i];
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if (dpadhit) for (int i = 0; i < MAXDPAD; i++)
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current[channel-1]->dpad_s[i] = dpad[i] || current[channel-1]->dpad_s[i]; // Drum hits aren't exclusive!
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current[channel-1]->clean = LOW;
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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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void display(int number){
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for(int i = 0; i < NBITS; i++) {
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digitalWrite(LEDS[i], number & (unsigned short) 1);
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number = number >> 1;
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}
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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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// Serial.println(sensor);
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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, channel);
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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, channel);
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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], channel);
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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, byte chan) {
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byte n = c + NOTEOffset;
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if (status == HIGH) {
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MIDI.sendNoteOn(n, velocity, chan);
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}
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else if (status == LOW) {
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MIDI.sendNoteOff(n, velocity, chan);
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}
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}
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void playDrum(int c, bool status, byte chan) {
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byte n = c + drumOffset;
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if (status == HIGH) {
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MIDI.sendNoteOn(n, velocity, chan + (byte) DRUMSHIFT);
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}
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else if (status == LOW) {
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MIDI.sendNoteOff(n, velocity, chan + (byte) DRUMSHIFT);
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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()) {
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if (Serial.read() == MIDICLOCK) {
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//sem_beat++;
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midiclock++;
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if (midiclock == BPQN){
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midiclock = 0;
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sem_beat++;
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}
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}
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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(byte chan) {
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link newS = newStep();
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link buffer;
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if (newS == NULL) return LOW;
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for (int i = 0; i < MAXKEYS; i++) newS->kboard_s[i] = LOW;
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for (int i = 0; i < MAXDPAD; i++) newS->dpad_s[i] = LOW;
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if (head[chan] == NULL) {
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newS->next = newS;
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newS->stepnumber = (unsigned short) 0;
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current[chan] = newS;
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head[chan] = newS;
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nstep[chan] = 1;
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}
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else {
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newS->stepnumber = nstep[chan];
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buffer = current[chan];
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while (buffer->next != head[chan]) buffer = buffer->next;
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buffer->next = newS;
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newS->next = head[chan];
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nstep[chan]++;
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}
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return HIGH;
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}
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void nextStep() {
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for (int chan=0; chan < 6; chan++) {
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if (head[chan] == NULL) continue;
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current[chan] = current[chan]->next;
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}
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}
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bool deleteStep(byte chan) {
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if (nstep[chan] < 1) return LOW;
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if (!current[chan]->clean) {
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for (int i = 0; i < MAXKEYS; i++) current[chan]->kboard_s[i] = LOW;
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for (int i = 0; i < MAXDPAD; i++) current[chan]->dpad_s[i] = LOW;
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current[chan]->clean = HIGH;
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return LOW;
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}
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if (nstep[chan] == 1) {
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free(current[chan]);
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head[chan] = NULL;
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current[chan] = NULL;
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}
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else {
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link buffer = current[chan];
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while (buffer->next != current[chan]) buffer = buffer->next;
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buffer->next = current[chan]->next;
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if (current[chan] == head[chan]) {
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head[chan] = head[chan]->next;
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int i = 0;
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buffer = head[chan];
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do {
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buffer->stepnumber = i;
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buffer = buffer->next;
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i++;
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} while (buffer != head[chan]);
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}
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else {
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buffer = buffer->next;
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while (buffer != head[chan]) {
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buffer->stepnumber--;
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buffer = buffer->next;
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}
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}
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free(current[chan]);
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buffer = buffer->next;
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}
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nstep[chan]--;
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return HIGH;
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} |