#include <MD_MAX72xx.h>
#include <MD_Parola.h>
// #include <SPI.h>
#include "Font_Data.h"
// #include <LibPrintf.h> // if using arduino

// change this pins to work with your board
#define MAX_DEVICES   4
#define CLK_PIN       13    // or SCK
#define DATA_PIN      11    // or MOSI
#define CS_PIN        12    // or SS

// Change this to work with your matrix - see video 1 you have 4 choices
#define HARDWARE_TYPE MD_MAX72XX::FC16_HW

MD_Parola P = MD_Parola(HARDWARE_TYPE, DATA_PIN, CLK_PIN, CS_PIN, MAX_DEVICES);

int hh=0, mm=0, ss=0, ms=0; 
bool timerStart = false;

char Buffer[3] = " ";  // create a buffer to hold the numbers

#define bt_start  2
#define bt_stop   3

void setup() { // put your setup code here, to run once 

pinMode(bt_start, INPUT_PULLUP);
pinMode(bt_stop,  INPUT_PULLUP);

P.begin();
P.setIntensity(1);       // keep it 3 or below as we are powering off the chip/usb
P.setFont(F4x7straight); // If you use the standard built in font the numbers on the matrix will jump around as the number 1 not as wide
                         // as the other numbers.  Comment out this line to see what happens.  I will have a video in the future to show
                         // how to create your own fonts or adjust the ones you find online.

noInterrupts();         // disable all interrupts
TCCR1A = 0;             // set entire TCCR1A register to 0  //set timer1 interrupt at 1kHz  // 1 ms
TCCR1B = 0;             // same for TCCR1B
TCNT1  = 0;             // set timer count for 1khz increments
OCR1A = 1999;           // = (16*10^6) / (1000*8) - 1
//had to use 16 bit timer1 for this bc 1999>255, but could switch to timers 0 or 2 with larger prescaler
// turn on CTC mode
TCCR1B |= (1 << WGM12); // Set CS11 bit for 8 prescaler
TCCR1B |= (1 << CS11);  // enable timer compare interrupt
TIMSK1 |= (1 << OCIE1A);
interrupts();           // enable
}


void loop() {

if(digitalRead (bt_start) == 0){ 
ms=0, ss=0, mm=0, hh=0; // Reset stopwatch 
timerStart = true; // Start stopwatch 
delay(100);
}

if(digitalRead (bt_stop) == 0){
timerStart = false; // Stop stopwatch 
delay(100);
}

if (P.displayAnimate()) {
sprintf(Buffer, "%02d%c%02d", mm, (':'), ss);  // the number "1" is the number of digits that you want always shown on the screen for this font we can have 5
P.displayText(Buffer, PA_CENTER, 0, 0, PA_PRINT, PA_NO_EFFECT);
}
}

ISR(TIMER1_COMPA_vect){
if(timerStart == true)
          {ms=ms+1;}
if(ms>999)
          {ms=0;ss=ss+1;}
if(ss>59)
          {ss=0; mm=mm+1;}
if(mm>59)
          {mm=0; hh=hh+1;}
}