/*************************************************** 
  This is a test example for the Adafruit Trellis w/HT16K33

  Designed specifically to work with the Adafruit Trellis 
  ----> https://www.adafruit.com/products/1616
  ----> https://www.adafruit.com/products/1611

  These displays use I2C to communicate, 2 pins are required to  
  interface
  Adafruit invests time and resources providing this open source code, 
  please support Adafruit and open-source hardware by purchasing 
  products from Adafruit!

  Written by Limor Fried/Ladyada for Adafruit Industries.  
  MIT license, all text above must be included in any redistribution
 ****************************************************/

#include <Wire.h>
#include "Adafruit_Trellis.h"

/*************************************************** 
  This example shows reading buttons and setting/clearing buttons in a loop
  "momentary" mode has the LED light up only when a button is pressed
  "latching" mode lets you turn the LED on/off when pressed

  Up to 8 matrices can be used but this example will show 4 or 1
 ****************************************************/

#define MOMENTARY 0
#define LATCHING 1
// set the mode here
#define MODE LATCHING 


Adafruit_Trellis matrix0 = Adafruit_Trellis();

// uncomment the below to add 3 more matrices
/*
Adafruit_Trellis matrix1 = Adafruit_Trellis();
Adafruit_Trellis matrix2 = Adafruit_Trellis();
Adafruit_Trellis matrix3 = Adafruit_Trellis();
// you can add another 4, up to 8
*/

// Just one
Adafruit_TrellisSet trellis =  Adafruit_TrellisSet(&matrix0);
// or use the below to select 4, up to 8 can be passed in
//Adafruit_TrellisSet trellis =  Adafruit_TrellisSet(&matrix0, &matrix1, &matrix2, &matrix3);

// set to however many you're working with here, up to 8
#define NUMTRELLIS 1

#define numKeys (NUMTRELLIS * 16)

// Connect Trellis Vin to 5V and Ground to ground.
// Connect the INT wire to pin #A2 (can change later!)
#define INTPIN A2
// Connect I2C SDA pin to your Arduino SDA line
// Connect I2C SCL pin to your Arduino SCL line
// All Trellises share the SDA, SCL and INT pin! 
// Even 8 tiles use only 3 wires max


void setup() {
  Serial.begin(9600);
  Serial.println("Trellis Demo");

  // INT pin requires a pullup
  pinMode(INTPIN, INPUT);
  digitalWrite(INTPIN, HIGH);
  
  // begin() with the addresses of each panel in order
  // I find it easiest if the addresses are in order
  trellis.begin(0x70);  // only one
  // trellis.begin(0x70, 0x71, 0x72, 0x73);  // or four!

  // light up all the LEDs in order
  for (uint8_t i=0; i<numKeys; i++) {
    trellis.setLED(i);
    trellis.writeDisplay();    
    delay(50);
  }
  // then turn them off
  for (uint8_t i=0; i<numKeys; i++) {
    trellis.clrLED(i);
    trellis.writeDisplay();    
    delay(50);
  }
}


void loop() {
  delay(30); // 30ms delay is required, dont remove me!
  
  if (MODE == MOMENTARY) {
    // If a button was just pressed or released...
    if (trellis.readSwitches()) {
      // go through every button
      for (uint8_t i=0; i<numKeys; i++) {
  // if it was pressed, turn it on
  if (trellis.justPressed(i)) {
    Serial.print("v"); Serial.println(i);
    trellis.setLED(i);
  } 
  // if it was released, turn it off
  if (trellis.justReleased(i)) {
    Serial.print("^"); Serial.println(i);
    trellis.clrLED(i);
  }
      }
      // tell the trellis to set the LEDs we requested
      trellis.writeDisplay();
    }
  }

  if (MODE == LATCHING) {
    // If a button was just pressed or released...
    if (trellis.readSwitches()) {
      // go through every button
      for (uint8_t i=0; i<numKeys; i++) {
        // if it was pressed...
  if (trellis.justPressed(i)) {
    Serial.print("v"); Serial.println(i);
    // Alternate the LED
    if (trellis.isLED(i))
      trellis.clrLED(i);
    else
      trellis.setLED(i);
        } 
      }
      // tell the trellis to set the LEDs we requested
      trellis.writeDisplay();
    }
  }
}