Lucas Oskorep
133 lines
3.9 KiB
Arduino
133 lines
3.9 KiB
Arduino
#include <Wire.h>
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#include <Adafruit_Trellis.h>
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#include <MIDIUSB.h>
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#define LED LED_BUILTIN // Pin for heartbeat LED (shows code is working)
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#define CHANNEL 1 // MIDI channel number
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Adafruit_Trellis trellis;
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#define ANALOG_INPUT
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uint8_t heart = 0; // Heartbeat LED counter
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unsigned long prevReadTime = 0L; // Keypad polling timer
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uint8_t mod;
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uint8_t vel;
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uint8_t fxc;
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uint8_t rate;
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uint8_t note[] = {
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60, 61, 62, 63,
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56, 57, 58, 59,
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52, 53, 54, 55,
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48, 49, 50, 51
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};
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// First parameter is the event type (0x09 = note on, 0x08 = note off).
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// Second parameter is note-on/note-off, combined with the channel.
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// Channel can be anything between 0-15. Typically reported to the user as 1-16.
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// Third parameter is the note number (48 = middle C).
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// Fourth parameter is the velocity (64 = normal, 127 = fastest).
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void noteOn(byte channel, byte pitch, byte velocity) {
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midiEventPacket_t noteOn = {0x09, (byte)(0x90 | channel), pitch, velocity};
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MidiUSB.sendMIDI(noteOn);
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}
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void noteOff(byte channel, byte pitch, byte velocity) {
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midiEventPacket_t noteOff = {0x08, (byte)(0x80 | channel), pitch, velocity};
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MidiUSB.sendMIDI(noteOff);
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}
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// First parameter is the event type (0x0B = control change).
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// Second parameter is the event type, combined with the channel.
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// Third parameter is the control number number (0-119).
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// Fourth parameter is the control value (0-127).
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void controlChange(byte channel, byte control, byte value) {
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midiEventPacket_t event = {0x0B, (byte) (0xB0 | channel), control, value};
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MidiUSB.sendMIDI(event);
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}
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void setup() {
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Serial.begin(9600);
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Serial.println("Trellis Demo");
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pinMode(LED, OUTPUT);
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trellis.begin(0x70); // Pass I2C address
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#ifdef __AVR__
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// Default Arduino I2C speed is 100 KHz, but the HT16K33 supports
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// 400 KHz. We can force this for faster read & refresh, but may
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// break compatibility with other I2C devices...so be prepared to
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// comment this out, or save & restore value as needed.
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TWBR = 12;
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#endif
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trellis.clear();
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trellis.writeDisplay();
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#ifdef ANALOG_INPUT
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mod = map(analogRead(0), 0, 1023, 0, 127);
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vel = map(analogRead(1), 0, 1023, 0, 127);
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fxc = map(analogRead(2), 0, 1023, 0, 127);
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rate = map(analogRead(3),0, 1023, 0, 127);
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controlChange(CHANNEL, 1, mod);
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controlChange(CHANNEL, 11, vel);
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controlChange(CHANNEL, 12, fxc);
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controlChange(CHANNEL, 13, rate);
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#endif
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}
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void loop() {
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unsigned long t = millis();
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if((t - prevReadTime) >= 20L) { // 20ms = min Trellis poll time
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if(trellis.readSwitches()) { // Button state change?
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for(uint8_t i=0; i<16; i++) { // For each button...
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if(trellis.justPressed(i)) {
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noteOn(CHANNEL, note[i], 127);
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Serial.print("v"); Serial.println(i);
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trellis.setLED(i);
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} else if(trellis.justReleased(i)) {
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noteOn(CHANNEL, note[i], 0);
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trellis.clrLED(i);
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}
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}
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trellis.writeDisplay();
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}
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#ifdef ANALOG_INPUT
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uint8_t newModulation = map(analogRead(0), 0, 1023, 0, 127);
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if(mod != newModulation) {
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mod = newModulation;
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controlChange(CHANNEL, 1, mod);
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Serial.println("Mod 1");
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}
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uint8_t newVelocity = map(analogRead(1), 0, 1023, 0, 127);
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if(vel != newVelocity) {
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vel = newVelocity;
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controlChange(CHANNEL, 11, vel);
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Serial.println("Mod 2");
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}
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uint8_t newEffect = map(analogRead(2), 0, 1023, 0, 127);
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if(fxc != newEffect) {
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fxc = newEffect;
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controlChange(CHANNEL, 12, fxc);
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Serial.println("Mod 3");
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}
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uint8_t newRate = map(analogRead(3), 0, 1023, 0, 127);
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if(rate !=newRate) {
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rate = newRate;
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controlChange(CHANNEL, 13, rate);
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Serial.println("Mod 4");
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}
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#endif
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prevReadTime = t;
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digitalWrite(LED, ++heart & 32); // Blink = alive
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MidiUSB.flush();
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}
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(void)MidiUSB.read(); // Discard incoming MIDI messages
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}
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