SAMD-Beats.ino

// TESTED ON SEEEDUINO WIO LITE MG126

#include <Arduino.h>
#include <MIDIUSB.h>
#include <MIDIUSB_Defs.h>
#include <frequencyToNote.h>
#include <pitchToFrequency.h>
#include <pitchToNote.h>
#include "Colors.h"
#include <Adafruit_GFX.h>
#include <Adafruit_NeoMatrix.h>
#define PIN       13
#define USER_BUTTON 38 // User button is mapped to toggle between Beats/SMPTE

Adafruit_NeoMatrix lc = Adafruit_NeoMatrix(32, 8, PIN,
                                           NEO_MATRIX_BOTTOM + NEO_MATRIX_RIGHT + NEO_MATRIX_COLUMNS + NEO_MATRIX_ZIGZAG,
                                           NEO_GRB + NEO_KHZ800);
const uint16_t colors[] = {

  lc.Color(pink.r, pink.g, pink.b), lc.Color(blue.r, blue.g, blue.b), lc.Color(yellow.r, yellow.g, yellow.b)
};

String beatCounter;
String barCounter;
midiEventPacket_t rx;
void displayPosition();
void noteOn(byte channel, byte pitch, byte velocity);
boolean dots;
int buttonState;
int lastButtonState = LOW;
int displayMode = 1;
int x = lc.width();
int16_t xPos0 = x - 32;
int16_t dot1 = x - 28;
int16_t xPos1 = x - 26;
int16_t xPos2 = x - 20;
int16_t dot2 = x - 15;
int16_t xPos3 = x - 14;
int16_t xPos4 = x - 8;
int16_t xPos5 = x - 2;

void setup() {
  SerialUSB.begin(115200);
  lc.begin();
  lc.setTextWrap(true);
  lc.setBrightness(32);
  lc.setTextColor(colors[1]);
  dots = false;
  lc.show();
  pinMode(USER_BUTTON,INPUT);
}

void loop() {
  rx = MidiUSB.read();
  displayPosition();
  readButton();
}

void readButton() {
  int reading = digitalRead(buttonPin);
    if (reading != buttonState) {
      buttonState = reading;
      if (buttonState == LOW) {
        displayMode = !displayMode;
        if (displayMode == 1) {
          noteOn(0, 0x35, 0x7F);
          MidiUSB.flush();
        }
        if (displayMode == 0) {
          noteOn(0, 0x35, 0);
          MidiUSB.flush();
        }
      }
    }
  lastButtonState = reading;
}


void displayPosition() {
  if (rx.byte1 >> 4 == 0x0B) {
  if (dots) {
    lc.drawPixel(dot1, 6, 50);
    lc.drawPixel(dot2, 6, 50);
  }
  if (rx.byte2 >= 0x40 && rx.byte2 <= 0x41) {
    lc.fillRect(xPos5, 0, 5, 8, 0);
    if ((rx.byte3 & 0x10) == 0) {
      beatCounter = 1;
    }  else {
      beatCounter = rx.byte3 & 0x0F;
    }
      lc.setCursor(xPos5, 0);
      lc.print(beatCounter);
      lc.show();
  }
  if (rx.byte2 >= 0x42 && rx.byte2 <= 0x43) {
    lc.fillRect(xPos4, 0, 5, 8, 0);
    if ((rx.byte3 & 0x10) == 0) {
      beatCounter = 1;
    }  else {
      beatCounter = rx.byte3 & 0x0F;
    }
      lc.setCursor(xPos4, 0);
      lc.print(beatCounter);
      lc.show();
  }
  if (rx.byte2 >= 0x43 && rx.byte2 <= 0x44) {
      lc.fillRect(xPos3, 0, 6, 8, 0);
    if ((rx.byte3 & 0x10) == 0) {
      beatCounter = " ";
    } else {
      beatCounter = rx.byte3 & 0x0F;
    }
      lc.setCursor(xPos3, 0);
      lc.print(beatCounter);
      lc.show();
  }
  if (rx.byte2 >= 0x45 && rx.byte2 <= 0x46) {
      lc.fillRect(xPos2, 0, 6, 8, 0);
    if ((rx.byte3 & 0x10) == 0) {
      beatCounter = " ";
    } else {
      beatCounter = rx.byte3 & 0x0F;
    }
      lc.setCursor(xPos2, 0);
      lc.print(beatCounter);
      lc.show();
  }
  if (rx.byte2 >= 0x46 && rx.byte2 <= 0x47) {
      lc.fillRect(xPos1, 0, 6, 8, 0);
    if ((rx.byte3 & 0x10) == 0) {
      beatCounter = " ";
    } else {
      beatCounter = rx.byte3 & 0x0F;
    }
      lc.setCursor(xPos1, 0);
      lc.print(beatCounter);
      lc.show();
  }
  if (rx.byte2 >= 0x48 && rx.byte2 <= 0x49) {  // position display message
      lc.fillRect(xPos0, 0, 6, 8, 0);
    if ((rx.byte3 & 0x10) == 0) {
      barCounter = " ";
    } else {
      barCounter = rx.byte3 & 0x0F;
    }
      lc.setCursor(xPos0, 0);
      lc.print(barCounter);
      lc.show();
  }
  }
}

void noteOn(byte channel, byte pitch, byte velocity) {
  midiEventPacket_t noteOn = { 0x09, 0x90 | channel, pitch, velocity };
  MidiUSB.sendMIDI(noteOn);
}

void noteOff(byte channel, byte pitch, byte velocity) {
  midiEventPacket_t noteOff = {0x08, 0x80 | channel, pitch, velocity};
  MidiUSB.sendMIDI(noteOff);
}