/*
  Blink

  Turns an LED on for one second, then off for one second, repeatedly.

  Most Arduinos have an on-board LED you can control. On the UNO, MEGA and ZERO
  it is attached to digital pin 13, on MKR1000 on pin 6. LED_BUILTIN is set to
  the correct LED pin independent of which board is used.
  If you want to know what pin the on-board LED is connected to on your Arduino
  model, check the Technical Specs of your board at:
  https://www.arduino.cc/en/Main/Products

  modified 8 May 2014
  by Scott Fitzgerald
  modified 2 Sep 2016
  by Arturo Guadalupi
  modified 8 Sep 2016
  by Colby Newman

  This example code is in the public domain.

  https://www.arduino.cc/en/Tutorial/BuiltInExamples/Blink
*/

/*
int col0 = 7;   //1
int col1 = 8;   //2
int row0 = 9;   //3
int col2 = 10;  //4
int row1 = 11;  //5
int col3 = 12;  //6
*/

/*
int col0 = 7;   //1
int col1 = 8;   //2
int col2 = 9;  //4
int col3 = 10;  //6

int row0 = 11;   //3
int row1 = 12;  //5
*/


int col0 = 14;   //1
int col1 = 4;   //2
int col2 = 2;  //4
int col3 = 15;  //6

int row0 = 12;   //3
int row1 = 13;  //5


int ledsArr[] = {0,0,0,0,0,0,0,0};

void setup() {
  Serial.begin(115200);
  
  pinMode(col0, OUTPUT);
  pinMode(col1, OUTPUT);
  pinMode(col2, OUTPUT);
  pinMode(col3, OUTPUT);

  pinMode(row0, OUTPUT);
  pinMode(row1, OUTPUT);
}

void led0(bool state) {
  if(state) {
    digitalWrite(row0, HIGH);   // turn the LED on (HIGH is the voltage level)
    digitalWrite(col0, LOW);    // turn the LED off by making the voltage LOW
  } else {
    digitalWrite(row0, LOW);   // turn the LED on (HIGH is the voltage level)
    digitalWrite(col0, HIGH);    // turn the LED off by making the voltage LOW
  }
}

void iterateUp() {
  for(int t = 100; t > 0; t -= 5) {
    for(int r = 11; r < 13; r++) {
      digitalWrite(r, HIGH);

      for(int c = 7; c < 11; c++) {
        digitalWrite(c, LOW);
        delay(t);
        digitalWrite(c, HIGH);
      }
      digitalWrite(r, LOW);
    }
  }

  for(int t = 0; t < 100; t++) {
    for(int r = 11; r < 13; r++) {
      digitalWrite(r, HIGH);

      for(int c = 7; c < 11; c++) {
        digitalWrite(c, LOW);
        delay(1);
        digitalWrite(c, HIGH);
      }
      digitalWrite(r, LOW);
    }
  }
}

void iterateDown() {
  for(int t = 1; t <= 100; t += 5) {
    for(int r = 11; r < 13; r++) {
      digitalWrite(r, HIGH);

      for(int c = 7; c < 11; c++) {
        digitalWrite(c, LOW);
        delay(t);
        digitalWrite(c, HIGH);
      }
      digitalWrite(r, LOW);
    }
  }
}

// the loop function runs over and over again forever
void loop() {
  if (Serial.available()) {
      char c = Serial.read();
      if (c == 'y') {
         iterateUp();
         }
      else if (c == 'n') {
         iterateDown();
         }
      }
  
  //set array of bits using led function
  //use array to write each pin function
  
  /**
  led0(true);
  delay(500);
  led0(false);
  delay(500);
  **/
}