#include <Keypad.h>

const byte ROWS = 4; 
const byte COLS = 4; 

char hexaKeys[ROWS][COLS] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}
};

byte rowPins[ROWS] = {14,15,16,17}; 
byte colPins[COLS] = {18,19,20,21}; 

Keypad customKeypad = Keypad(makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLS); 

unsigned char Digits[12] = {
    0xC0, // 0 -> 1100 0000
    0xF9, // 1 -> 1111 1001
    0xA4, // 2 -> 1010 0100
    0xB0, // 3 -> 1011 0000
    0x99, // 4 -> 1001 1001
    0x92, // 5 -> 1001 0010
    0x82, // 6 -> 1000 0010
    0xF8, // 7 -> 1111 1000
    0x80, // 8 -> 1000 0000
    0x90, // 9 -> 1001 0000
    0x00, // All On
    0xFF  // All Off
};

void shiftAll(byte send_to_address, byte send_this_data)
{
  digitalWrite(10, LOW);
  for (int i = 0; i < 16; i++) {
    shiftOut(11, 13, MSBFIRST, send_to_address);
    shiftOut(11, 13, MSBFIRST, send_this_data);
  }
  digitalWrite(10, HIGH);
}


//void setup() {
//  Serial.begin(115200);
//  pinMode(CLK, OUTPUT);
//  pinMode(DIN, OUTPUT);
//  pinMode(CS, OUTPUT);

  // Setup each MAX7219
//  shiftAll(0x0f, 0x00); //display test register - test mode off
//  shiftAll(0x0b, 0x07); //scan limit register - display digits 0 thru 7
//  shiftAll(0x0c, 0x01); //shutdown register - normal operation
//  shiftAll(0x0a, 0x0f); //intensity register - max brightness
//}

void setup(){
  Serial.begin(9600);
  DDRC = 0xFF;
  DDRB |= 0xBF;
  PORTC = Digits[10];
  PORTB &=~ 0x0F;
  PORTB |= 0x01;
  shiftAll(0x0f, 0x00); //display test register - test mode off
  shiftAll(0x0b, 0x07); //scan limit register - display digits 0 thru 7
  shiftAll(0x0c, 0x01); //shutdown register - normal operation
  shiftAll(0x0a, 0x0f); //intensity register - max brightness
}
  
void loop(){
  char customKey = customKeypad.getKey();
  
  if (customKey){
    if(customKey == '0') {
      PORTC = Digits[0];
    }
    else if(customKey == '1') {
      PORTC = Digits[1];
    }
    else if(customKey == '2') {
      PORTC = Digits[2];
    }
    else if(customKey == '3') {
      PORTC = Digits[3];
    }
    else if(customKey == '4') {
      PORTC = Digits[4];
    }
    else if(customKey == '5') {
      PORTC = Digits[5];
    }
    else if(customKey == '6') {
      PORTC = Digits[6];
    }
    else if(customKey == '7') {
      PORTC = Digits[7];
    }
    else if(customKey == '8') {
      PORTC = Digits[8];
    }
    else if(customKey == '9') {
      PORTC = Digits[9];
    }
    else if(customKey == 'A') {
      PORTB &=~ 0x0F;
      PORTB |= 0x01;
    }
    else if(customKey == 'B') {
      PORTB &=~ 0x0F;
      PORTB |= 0x02;
    }
    else if(customKey == 'C') {
      PORTB &=~ 0x0F;
      PORTB |= 0x04;
    }
    else if(customKey == 'D') {
      PORTB &=~ 0x0F;
      PORTB |= 0x08;
    }
    Serial.println(customKey);
  }
}