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Add code
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589
MIDI2CV.ino
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589
MIDI2CV.ino
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#include <MIDI.h>
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#include <Wire.h>
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#include <mcp4728.h>
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#include <EEPROM.h>
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#define MIDI_CHANNEL 1
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#define OCTAVE_RANGE 5
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#define NOTE_RANGE (OCTAVE_RANGE * 12)
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#define MAX_CV (OCTAVE_RANGE * 1000)
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#define BASE_NOTE 34
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// Define Pitch Bend range to be a major second
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#define BEND_RANGE ((1000.0 / 12.0) * 1.5)
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#define PIN_GATE_0 9
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#define PIN_GATE_1 10
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#define PIN_GATE_2 11
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#define PIN_GATE_3 12
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#define MODE_MONO 0
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#define MODE_ARP 1
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#define MODE_SEQ 2
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#define PIN_SPEED A3
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#define PIN_FLIP_SWITCH_0 A6
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#define PIN_FLIP_SWITCH_1 A7
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#define FLIP_SWITCH_UP 0
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#define FLIP_SWITCH_MIDDLE 1
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#define FLIP_SWITCH_DOWN 2
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#define ROTARY_SWITCH_PIN0 2
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#define ROTARY_SWITCH_PIN1 3
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#define ROTARY_SWITCH_PIN2 4
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#define ROTARY_SWITCH_PIN3 5
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#define ROTARY_SWITCH_PIN4 6
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#define ROTARY_SWITCH_PIN5 7
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#define MIDI_CLOCK_THRESHOLD_MILLIS 500
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#define MIDI_CLOCK_DIVIDE_QUARTER 24
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#define MIDI_CLOCK_DIVIDE_HALF MIDI_CLOCK_DIVIDE_QUARTER * 2
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#define MIDI_CLOCK_DIVIDE_WHOLE MIDI_CLOCK_DIVIDE_HALF * 2
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#define MIDI_CLOCK_DIVIDE_EIGTH MIDI_CLOCK_DIVIDE_QUARTER / 2
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#define MIDI_CLOCK_DIVIDE_EIGHT_T MIDI_CLOCK_DIVIDE_QUARTER / 3
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#define MIDI_CLOCK_DIVIDE_SIXTEENTH MIDI_CLOCK_DIVIDE_EIGTH / 2
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#define MIDI_CLOCK_DIVIDE_SIXTEENTH_T MIDI_CLOCK_DIVIDE_EIGTH / 3
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#define MIDI_CLOCK_DIVIDE_THIRTY_SECOND MIDI_CLOCK_DIVIDE_SIXTEENTH / 2
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#define MIDI_CLOCK_DIVIDE_THIRTY_SECOND_T MIDI_CLOCK_DIVIDE_SIXTEENTH / 3
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#define MIDI_CLOCK_DIVISION_COUNT 9
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const int clockDivisions[] = { MIDI_CLOCK_DIVIDE_WHOLE, MIDI_CLOCK_DIVIDE_HALF,
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MIDI_CLOCK_DIVIDE_QUARTER,
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MIDI_CLOCK_DIVIDE_EIGTH, MIDI_CLOCK_DIVIDE_EIGHT_T,
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MIDI_CLOCK_DIVIDE_SIXTEENTH, MIDI_CLOCK_DIVIDE_SIXTEENTH_T,
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MIDI_CLOCK_DIVIDE_THIRTY_SECOND, MIDI_CLOCK_DIVIDE_THIRTY_SECOND_T
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};
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#define MANUAL_CLOCK_MIN 20
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#define MANUAL_CLOCK_MAX 2000
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#define SEQUENCE_COUNT 6
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#define SEQUENCE_LENGTH_MAX 128
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#define ARP_DIRECTION_UP 0
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#define ARP_DIRECTION_DOWN 1
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#define ARP_DIRECTION_BOTH 2
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#define ARP_DIRECTION_ORDER 3
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#define ARP_DIRECTION_RANDOM 4
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#define ARP_DIRECTION_NONE 5
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#define ARP_MODE_LATCH FLIP_SWITCH_UP
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#define ARP_MODE_FORGET FLIP_SWITCH_MIDDLE
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#define ARP_MODE_ADD FLIP_SWITCH_DOWN
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mcp4728 dac = mcp4728(0);
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MIDI_CREATE_DEFAULT_INSTANCE();
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byte currentMode = MODE_MONO;
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byte flipSwitch0 = FLIP_SWITCH_UP;
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byte flipSwitch1 = FLIP_SWITCH_UP;
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byte rotarySwitch = 0;
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int speedValue = 0;
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int cv[] = {0, 0, 0, 0}; // 0 to MAX_CV
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bool gate[] = {LOW, LOW, LOW, LOW}; // LOW or HIGH
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bool midiStartSignal = LOW;
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bool midiClockSignal = LOW;
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unsigned long activeNotes[NOTE_RANGE];
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unsigned long noteCount = 1;
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byte activeNoteCount = 0;
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int currentPitchBend = 0;
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byte currentModulation = 0;
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byte currentVelocity = 0;
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bool trigger = false;
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bool released = false;
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byte lastChannel = 0;
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int clockCounter = 0;
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unsigned long lastClockMillis = 0;
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byte currentClockDivide = 0;
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byte nextClockDivide = 0;
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unsigned long lastManualClockMillis = 0;
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byte currentSequencePosition = 0;
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byte currentArpPosition = 0;
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unsigned long activeArpNotes[NOTE_RANGE];
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byte activeArpNoteCount = 0;
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bool arpLatchReadyForNew = true;
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void setup() {
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dac.begin();
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dac.vdd(5000);
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dac.setVref(1,1,1,1); // set to use internal voltage reference (2.048V)
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dac.setGain(1, 1); // set the gain of internal voltage reference ( 2.048V x 2 = 4.096V )
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pinMode(PIN_GATE_0, OUTPUT);
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pinMode(PIN_GATE_1, OUTPUT);
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pinMode(PIN_GATE_2, OUTPUT);
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pinMode(PIN_GATE_3, OUTPUT);
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MIDI.begin(MIDI_CHANNEL_OMNI);
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MIDI.setHandleClock(onMidiClock);
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MIDI.setHandleNoteOn(onMidiNoteOn);
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MIDI.setHandleNoteOff(onMidiNoteOff);
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MIDI.setHandleStart(onMidiStart);
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MIDI.setHandleControlChange(onMidiControlChange);
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MIDI.setHandlePitchBend(onMidiPitchBend);
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}
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void onMidiClock() {
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if(clockCounter == 0) {
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midiClockSignal = HIGH;
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}
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clockCounter++;
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if(clockCounter == clockDivisions[currentClockDivide]) {
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clockCounter = 0;
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currentClockDivide = nextClockDivide;
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}
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lastClockMillis = millis();
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}
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void onMidiNoteOn(byte channel, byte note, byte velocity) {
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if(channel > MIDI_CHANNEL + 1) return;
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lastChannel = channel;
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if(velocity == 0) { onMidiNoteOff(channel, note, velocity); return; }
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activeNotes[note - BASE_NOTE] = noteCount++;
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activeNoteCount++;
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currentVelocity = velocity;
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trigger = true;
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}
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void onMidiNoteOff(byte channel, byte note, byte velocity) {
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if(channel > MIDI_CHANNEL + 1) return;
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activeNotes[note - BASE_NOTE] = 0;
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activeNoteCount--;
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if(activeNoteCount == 0) currentVelocity = 0;
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released = 0;
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}
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void onMidiControlChange(byte channel, byte number, byte value) {
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if(channel > MIDI_CHANNEL + 1) return;
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currentModulation = value;
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}
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void onMidiPitchBend(byte channel, int bend) {
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if(channel > MIDI_CHANNEL + 1) return;
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currentPitchBend = bend;
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}
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void onMidiStart() {
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midiStartSignal = HIGH;
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clockCounter = 0;
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currentClockDivide = nextClockDivide;
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}
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int midiToCV(byte note) {
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if(note < BASE_NOTE) return 0;
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if(note - BASE_NOTE > NOTE_RANGE) return MAX_CV;
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return map(note - BASE_NOTE, 0, NOTE_RANGE, 0, MAX_CV);
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}
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byte getMostRecentNote() {
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byte note;
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unsigned long maxTime = 0;
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for(byte i = 0; i < NOTE_RANGE; i++) {
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if(activeNotes[i] != 0 && activeNotes[i] >= maxTime) {
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note = i;
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maxTime = activeNotes[i];
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}
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}
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return note;
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}
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void loop() {
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readSwitches();
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if(flipSwitch0 == FLIP_SWITCH_UP) currentMode = MODE_MONO;
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else if(flipSwitch0 == FLIP_SWITCH_MIDDLE) currentMode = MODE_SEQ;
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else if(flipSwitch0 == FLIP_SWITCH_DOWN) currentMode = MODE_ARP;
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readSpeed();
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MIDI.read();
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if(millis() - lastClockMillis > MIDI_CLOCK_THRESHOLD_MILLIS) {
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// Apparently we are not getting any midi clocks, so we will just generate our own signal.
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long waitTime = map(speedValue, 0, 1023, (60000) / MANUAL_CLOCK_MIN, (60000) / MANUAL_CLOCK_MAX);
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if(millis() - lastManualClockMillis > waitTime) {
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// Time for another clock signal!
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lastManualClockMillis = millis();
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midiClockSignal = HIGH;
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}
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} else {
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nextClockDivide = map(speedValue, 0, 1023, 0, MIDI_CLOCK_DIVISION_COUNT);
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}
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bool triggerOut = false;
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switch(currentMode) {
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case MODE_MONO:
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if(activeNoteCount > 0) {
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// Find most recent hit key
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byte note = getMostRecentNote();
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int value = midiToCV(note + BASE_NOTE);
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cv[0] = value + mapfloat(currentPitchBend, 0, MIDI_PITCHBEND_MAX, -BEND_RANGE, BEND_RANGE);
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cv[1] = map(currentVelocity, 0, 127, 0, MAX_CV);
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cv[2] = map(currentModulation, 0, 127, 0, MAX_CV);
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triggerOut = trigger;
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if(lastChannel == MIDI_CHANNEL + 1 && trigger) { // IF on second channel, we retrigger the gate.
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gate[0] = LOW;
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} else {
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gate[0] = HIGH;
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}
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} else {
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gate[0] = LOW;
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}
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break;
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case MODE_SEQ:
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if(flipSwitch1 == FLIP_SWITCH_UP) {
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// Rec mode.
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if(activeNoteCount > 0) {
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// Find most recent hit key
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byte note = getMostRecentNote();
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int value = midiToCV(note + BASE_NOTE);
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cv[0] = value + mapfloat(currentPitchBend, 0, MIDI_PITCHBEND_MAX, -BEND_RANGE, BEND_RANGE);
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gate[0] = HIGH;
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if(trigger) {
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triggerOut = true;
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EEPROM.update(rotarySwitch, EEPROM[rotarySwitch] + 1);
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byte notePosition = EEPROM[rotarySwitch] - 1;
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EEPROM.update(SEQUENCE_COUNT + rotarySwitch * SEQUENCE_LENGTH_MAX + notePosition, note);
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}
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} else {
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gate[0] = LOW;
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triggerOut = false;
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}
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} else if(flipSwitch1 == FLIP_SWITCH_MIDDLE) {
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// Play Mode
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if(activeNoteCount > 0 && EEPROM[rotarySwitch] > 0) {
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byte note = getMostRecentNote();
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byte currentSequenceValue = EEPROM[SEQUENCE_COUNT + rotarySwitch * SEQUENCE_LENGTH_MAX + currentSequencePosition];
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note = currentSequenceValue + note - EEPROM[SEQUENCE_COUNT + rotarySwitch * SEQUENCE_LENGTH_MAX + 0];
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if(trigger && millis() - lastClockMillis > MIDI_CLOCK_THRESHOLD_MILLIS) {
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// no midi input but a key was pressed, so we start the sequence now instead of at next clock signal
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midiClockSignal = HIGH;
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lastManualClockMillis = millis();
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}
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if(midiClockSignal) { // trigger a new note!
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triggerOut = true;
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int value = midiToCV(note + BASE_NOTE);
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cv[0] = value + mapfloat(currentPitchBend, 0, MIDI_PITCHBEND_MAX, -BEND_RANGE, BEND_RANGE);
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currentSequencePosition = (currentSequencePosition + 1) % EEPROM[rotarySwitch];
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}
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gate[0] = HIGH;
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} else {
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gate[0] = LOW;
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currentSequencePosition = 0;
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}
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} else if(flipSwitch1 == FLIP_SWITCH_DOWN) {
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// clear on note
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if(activeNoteCount > 0 && trigger) {
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EEPROM.update(rotarySwitch, 0);
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}
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}
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break;
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case MODE_ARP:
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if(flipSwitch1 == ARP_MODE_LATCH) {
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// ARP Mode LATCH
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if(trigger) {
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if(activeNoteCount == 1) {
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// first note of the new arpeggio pressed
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currentArpPosition = 0;
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activeArpNoteCount = 1;
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for(int i = 0; i < NOTE_RANGE; i++) {
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if(activeNotes[i] != 0) currentArpPosition = i; // This is the first note of our arpeggio, so set it to this
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activeArpNotes[i] = activeNotes[i];
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}
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} else {
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// new note for current arpeggio
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for(int i = 0; i < NOTE_RANGE; i++) {
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if(activeNotes[i] != 0 && activeArpNotes[i] == 0) activeArpNoteCount++;
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if(activeNotes[i] != 0) // We don't want to disable any notes, only activate new ones
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activeArpNotes[i] = activeNotes[i];
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}
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}
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}
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} else if(flipSwitch1 == ARP_MODE_FORGET) {
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// activeArpNotes is equivalent to activeNotes. ezpz
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for(int i = 0; i < NOTE_RANGE; i++) {
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activeArpNotes[i] = activeNotes[i];
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}
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activeArpNoteCount = activeNoteCount;
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if(released && activeNoteCount == 0) {
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currentArpPosition = 0;
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}
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} else if(flipSwitch1 == ARP_MODE_ADD) {
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// we just add any active Note until some mysterious signal tells us to reset (modulation > 63!)
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if(currentModulation < 64) {
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byte active = 0;
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for(int i = 0; i < NOTE_RANGE; i++) {
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if(activeNotes[i] > 0) {
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activeArpNotes[i] = activeNotes[i];
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}
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if(activeArpNotes[i] != 0)
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active++;
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}
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activeArpNoteCount = active;
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} else {
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activeArpNoteCount = 0;
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for(int i = 0; i < NOTE_RANGE; i++)
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activeArpNotes[i] = 0;
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}
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}
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if(activeArpNoteCount > 0) {
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if( activeArpNotes[currentArpPosition] == 0) {
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// find the first note in the arp.
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switch(rotarySwitch) {
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case ARP_DIRECTION_UP:
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case ARP_DIRECTION_BOTH:
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for(int i = 0; i < NOTE_RANGE; i++)
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if(activeArpNotes[i] != 0) {
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currentArpPosition = i;
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break;
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}
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break;
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case ARP_DIRECTION_DOWN:
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for(int i = NOTE_RANGE - 1; i >= 0; i--)
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if(activeArpNotes[i] != 0) {
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currentArpPosition = i;
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break;
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}
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break;
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case ARP_DIRECTION_RANDOM:
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byte newIndex = 0;
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do {
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newIndex = random(0, 255);
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} while(activeArpNotes[newIndex] == 0 || currentArpPosition == newIndex);
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currentArpPosition = newIndex;
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break;
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case ARP_DIRECTION_ORDER:
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byte minValue = 0;
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byte minValueIndex = 0;
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for(int i = 0; i < NOTE_RANGE; i++) {
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if(i == currentArpPosition || activeArpNotes[i] == 0) continue;
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if(activeArpNotes[i] < minValue) {
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minValue = activeArpNotes[i];
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minValueIndex = i;
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}
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}
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currentArpPosition = minValueIndex;
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break;
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}
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}
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byte note = currentArpPosition; // This is the current Arp Note to play
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if(midiClockSignal) { // trigger a new note!
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triggerOut = true;
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int value = midiToCV(note + BASE_NOTE);
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cv[0] = value + mapfloat(currentPitchBend, 0, MIDI_PITCHBEND_MAX, -BEND_RANGE, BEND_RANGE);
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// now we have to find the next arp position. this depends on the current mode.
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bool foundNote = false;
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switch(rotarySwitch) {
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case ARP_DIRECTION_UP:
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if(activeArpNoteCount == 1) break;
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// We just go up and if we reach the last note in the arp, we go back to the first one
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for(int i = currentArpPosition + 1; i < NOTE_RANGE; i++) {
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if(activeArpNotes[i] != 0) {
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// found the next note!
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currentArpPosition = i;
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foundNote = true;
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break;
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}
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}
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if(!foundNote) {
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// We have to find the first note at the beginning of the arpeggio now...
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for(int i = 0; i < NOTE_RANGE; i++) {
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if(activeArpNotes[i] != 0) {
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// found the next note!
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currentArpPosition = i;
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break;
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}
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}
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}
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break;
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case ARP_DIRECTION_DOWN:
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if(activeArpNoteCount == 1) break;
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// We just go down and if we reach the first note in the arp, we go forward to the last one
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for(int i = currentArpPosition - 1; i >= 0; i--) {
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if(activeArpNotes[i] != 0) {
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// found the next note!
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currentArpPosition = i;
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foundNote = true;
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break;
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}
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}
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if(!foundNote) {
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// We have to find the last note at the beginning of the arpeggio now...
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for(int i = NOTE_RANGE - 1; i >= 0; i--) {
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if(activeArpNotes[i] != 0) {
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// found the next note!
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||||
currentArpPosition = i;
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
break;
|
||||
case ARP_DIRECTION_BOTH:
|
||||
if(activeArpNoteCount == 1) break;
|
||||
// We just go up and if we reach the last note in the arp, we go back one note
|
||||
for(int i = currentArpPosition + 1; i < NOTE_RANGE; i++) {
|
||||
if(activeArpNotes[i] != 0) {
|
||||
// found the next note!
|
||||
currentArpPosition = i;
|
||||
foundNote = true;
|
||||
break;
|
||||
}
|
||||
}
|
||||
// we are going downwards, so let's search!
|
||||
if(!foundNote) {
|
||||
for(int i = currentArpPosition - 1; i >= 0; i--) {
|
||||
if(activeArpNotes[i] != 0) {
|
||||
// found the next note!
|
||||
currentArpPosition = i;
|
||||
foundNote = true;
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
break;
|
||||
case ARP_DIRECTION_ORDER:
|
||||
if(activeArpNoteCount == 1) break;
|
||||
// We find the note that has the least distance to the current notes value.
|
||||
// If we can't find one, we assign the note with the lowest value
|
||||
byte minValue = 255;
|
||||
byte minValueIndex = 0;
|
||||
for(int i = 0; i < NOTE_RANGE; i++) {
|
||||
if(i == currentArpPosition || activeArpNotes[i] == 0) continue;
|
||||
byte distance = abs(activeArpNotes[i] - activeArpNotes[currentArpPosition]);
|
||||
if(distance < minValue) {
|
||||
minValue = distance;
|
||||
minValueIndex = i;
|
||||
}
|
||||
}
|
||||
|
||||
if(minValue == 255) { // We did not find a higher note, so let's go back to the first one.
|
||||
minValue = 0;
|
||||
for(int i = 0; i < NOTE_RANGE; i++) {
|
||||
if(i == currentArpPosition || activeArpNotes[i] == 0) continue;
|
||||
if(activeArpNotes[i] < minValue) {
|
||||
minValue = activeArpNotes[i];
|
||||
minValueIndex = i;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
currentArpPosition = minValueIndex;
|
||||
break;
|
||||
case ARP_DIRECTION_RANDOM:
|
||||
byte newIndex = 0;
|
||||
|
||||
do {
|
||||
newIndex = random(0, 255);
|
||||
} while(activeArpNotes[newIndex] == 0 || currentArpPosition == newIndex);
|
||||
|
||||
currentArpPosition = newIndex;
|
||||
|
||||
break;
|
||||
case ARP_DIRECTION_NONE:
|
||||
// Noone knows what happens here.
|
||||
break;
|
||||
}
|
||||
|
||||
}
|
||||
gate[0] = HIGH;
|
||||
|
||||
|
||||
|
||||
|
||||
} else {
|
||||
gate[0] = LOW;
|
||||
currentArpPosition = 0;
|
||||
}
|
||||
|
||||
break;
|
||||
}
|
||||
|
||||
gate[1] = triggerOut ? HIGH : LOW;
|
||||
gate[2] = midiStartSignal;
|
||||
gate[3] = midiClockSignal;
|
||||
|
||||
trigger = false;
|
||||
released = false;
|
||||
midiStartSignal = LOW;
|
||||
midiClockSignal = LOW;
|
||||
|
||||
writeDACs();
|
||||
writeGates();
|
||||
}
|
||||
|
||||
float mapfloat(float x, float in_min, float in_max, float out_min, float out_max)
|
||||
{
|
||||
return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
|
||||
}
|
||||
|
||||
void readSwitches() {
|
||||
int analogValue = analogRead(PIN_FLIP_SWITCH_0);
|
||||
if(analogValue < 100) flipSwitch0 = FLIP_SWITCH_UP;
|
||||
else if(analogValue < 900) flipSwitch0 = FLIP_SWITCH_DOWN;
|
||||
else flipSwitch0 = FLIP_SWITCH_MIDDLE;
|
||||
analogValue = analogRead(PIN_FLIP_SWITCH_1);
|
||||
if(analogValue < 100) flipSwitch1 = FLIP_SWITCH_UP;
|
||||
else if(analogValue < 900) flipSwitch1 = FLIP_SWITCH_DOWN;
|
||||
else flipSwitch1 = FLIP_SWITCH_MIDDLE;
|
||||
|
||||
if(digitalRead(ROTARY_SWITCH_PIN0) == LOW) rotarySwitch = 0;
|
||||
else if(digitalRead(ROTARY_SWITCH_PIN1) == LOW) rotarySwitch = 1;
|
||||
else if(digitalRead(ROTARY_SWITCH_PIN2) == LOW) rotarySwitch = 2;
|
||||
else if(digitalRead(ROTARY_SWITCH_PIN3) == LOW) rotarySwitch = 3;
|
||||
else if(digitalRead(ROTARY_SWITCH_PIN4) == LOW) rotarySwitch = 4;
|
||||
else if(digitalRead(ROTARY_SWITCH_PIN5) == LOW) rotarySwitch = 5;
|
||||
}
|
||||
|
||||
void readSpeed() {
|
||||
speedValue = analogRead(PIN_SPEED);
|
||||
}
|
||||
|
||||
void writeDACs() {
|
||||
dac.analogWrite(map(cv[0], 0, MAX_CV, 0, 4095), map(cv[1], 0, MAX_CV, 0, 4095), map(cv[2], 0, MAX_CV, 0, 4095), map(cv[3], 0, MAX_CV, 0, 4095));
|
||||
}
|
||||
|
||||
void writeGates() {
|
||||
digitalWrite(PIN_GATE_0, gate[0] == HIGH ? LOW : HIGH);
|
||||
digitalWrite(PIN_GATE_1, gate[1] == HIGH ? LOW : HIGH);
|
||||
digitalWrite(PIN_GATE_2, gate[2] == HIGH ? LOW : HIGH);
|
||||
digitalWrite(PIN_GATE_3, gate[3] == HIGH ? LOW : HIGH);
|
||||
}
|
Loading…
Reference in a new issue