Interrupt counter

[soosp]

Hi,
I'm working on a Geiger counter. My idea is to make it LoRaWAN capable to use it on TTN, but I'm worrying about the interrupts.
He is a sample code to show how the counter works:

#define PERIOD 60000

unsigned long previousMillis;
unsigned long cpm; // counts per minute

void countPulse() {
  cpm++;
}

void setup() {
  cpm = 0;

  Serial.begin(9600);
  pinMode(2, INPUT);
  Serial.println("Start counter");
  attachInterrupt(digitalPinToInterrupt(2), countPulse, FALLING);
  previousMillis = millis();
}

void loop() {
  unsigned long currentMillis = millis();
  if (currentMillis - previousMillis > PERIOD) {
    previousMillis = currentMillis;
    Serial.print("CPM: ");
    Serial.println(cpm);
    cpm = 0;
  }
}

When a falling edge arrives to the pin 2 it generates an interrupt and increments a counter.

I have studied the LMIC library code and I found that it disables interrupts when process the scheduled jobs. I'm worrying that it results fake measurments from the counter. Is this possible to enable the interrupts for the counter all time?

[soosp]

To answare my question, I found a promising solution. There is a low power I2C counter IC to solve my problem: ABLIC S-35770 (https://www.ablic.com/en/semicon/datasheets/rtc/counter-ic/s-35770-i/).