/* Based on SevSeg Counter Example
   Copyright 2020 Dean Reading

   added interrupt routine and reset button.

   optional todo feature: count direction switch

   final version expected to run on an Arduino Nano
    (smaller form factor)

   fjkraan@electrickery.nl, 2024-11-24
 
 */
// Leonardo can use 0, 1, 2, 3, 7
// Uno, Nano can use 2, 3
#define interruptPin 2 

int pulses = 0;
bool direction = true; // true is incrementing

// 
#define  resetPin      A0
#define  directionPin  A1

// SevSeg 3.7.0 by Dean Reading
#include "SevSeg.h"
SevSeg sevseg; //Instantiate a seven segment controller object

void setup() {
  pinMode(interruptPin, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(interruptPin), blink, RISING);

  pinMode(resetPin, INPUT_PULLUP);
  pinMode(directionPin, INPUT_PULLUP);

  byte numDigits = 4;
  byte digitPins[] = {10, 11, 12, 13};
  byte segmentPins[] = {0, 3, 4, 5, 6, 7, 8, 9};
  bool resistorsOnSegments = true; // 'false' means resistors are on digit pins
  byte hardwareConfig = COMMON_ANODE; // See README.md for options
  bool updateWithDelays = false; // Default 'false' is Recommended
  bool leadingZeros = false; // Use 'true' if you'd like to keep the leading zeros
  bool disableDecPoint = false; // Use 'true' if your decimal point doesn't exist or isn't connected
  
  sevseg.begin(hardwareConfig, numDigits, digitPins, segmentPins, resistorsOnSegments,
              updateWithDelays, leadingZeros, disableDecPoint);
  sevseg.setBrightness(90);
}

void loop() {
  static unsigned long timer = millis();
  
  if (!digitalRead(resetPin)) {
    pulses = 0;
    direction = true;
  }
  if (!digitalRead(directionPin)) {
    direction = false;
  } 
  if (millis() - timer >= 100) {
    sevseg.setNumber(pulses, -1);
  }
  
  sevseg.refreshDisplay(); // Must run repeatedly
}

void blink() {
  if (direction) {
    pulses++;
  } else {
    --pulses;
  }
  if (pulses > 9999) pulses = 0;
  if (pulses < 0) pulses = 9999;
}

/// END ///