#define ledEnable 2

#define buttonRead 6
#define buttonEnable 7

#define buttonKey 0
#define keyCount 37

bool keys[keyCount];

char chars[keyCount] = "abcdefghijklmnopqrstuvwxyz0123456789";

void initArrays(void) {
  for (int key = 0; key < keyCount; key++) {
    keys[key] = false;
  }
}

void setup() {
  initArrays();
  // put your setup code here, to run once:
  Serial1.begin(115200);
  Serial1.println("Hello, Raspberry Pi Pico!");

  pinMode(buttonEnable, OUTPUT);
  digitalWrite(buttonEnable, LOW);

  pinMode(ledEnable, OUTPUT);
  digitalWrite(ledEnable, HIGH);

  pinMode(buttonRead, INPUT_PULLUP);
}

void loop() {
  if (digitalRead(buttonRead) == LOW) {
    if (!keys[buttonKey])
      keyDown(buttonKey);
  } else {
    if (keys[buttonKey])
      keyUp(buttonKey);
  }

  delay(10);
}

void keyDown(int key) {
  Serial1.print(key);
  Serial1.println(" pressed");
  keys[key] = true;
}

void keyUp(int key) {
  Serial1.print(key);
  Serial1.println(" released");
  keys[key] = false;
}