// Board: Adafruit Feather M0

#include <Arduino.h>

#include <Adafruit_GFX.h>
#include "Adafruit_LEDBackpack.h"  // "Adafruit LED Backpack Library" v1.5.0

Adafruit_7segment matrix = Adafruit_7segment();

// --- Tachometer variables ---
const int TACH_INTERRUPT_PIN = A0; // Or any other digital pin capable of interrupts
volatile unsigned long pulse_count = 0;

// --- Interrupt Service Routine (ISR) ---
void count_pulse() {
  pulse_count++;
}

void show(int num) {
	matrix.print(num, DEC);
	matrix.writeDisplay();
}

void setup() {
	matrix.begin(0x70);

	Serial.begin(115200);
	// Serial.setDebugOutput(true);

  // --- Setup Tachometer Interrupt ---
  pinMode(TACH_INTERRUPT_PIN, INPUT_PULLUP); // Set pin as input with internal pull-up resistor
  attachInterrupt(digitalPinToInterrupt(TACH_INTERRUPT_PIN), count_pulse, RISING);

	delay(1000);

	Serial.println();
	Serial.println();
	Serial.println("================");
	Serial.println("BOOT UP");

	show(99999);

}

void loop() {
;
}