💾 107-Arduino-CriticalSection

This library provides a consistent critical section interface over various Arduino platforms.

This library works for

• ArduinoCore-samd: Arduino Zero, MKR 1000, MKR WiFi 1010, Nano 33 IoT, MKR GSM 1400, MKR NB 1500, MKR WAN 1300/1310 ✔️
• ArduinoCore-mbed: Portenta H7, Nano 33 BLE, Nano RP2040 Connect, Edge Control ✔️
• arduino-esp32: ESP32 Dev Module, ESP32 Wrover Module, ... ✔️
• arduino-pico: Raspberry Pi Pico, Adafruit Feather RP2040, ... ✔️
• adafruit/ArduinoCore-samd: Adafruit Feather M4 CAN Express, ... ✔️
• ArduinoCore-renesas: Portenta C33, Uno R4 WiFi, Uno R4 Minima, ... ✔️

Example

#include <107-Arduino-CriticalSection.h>

volatile int button_evt_counter = 0;

void setup() {
  Serial.begin(9600);
  while (!Serial) { }

  attachInterrupt(0, onButton_1_Pressed, RISING);
  attachInterrupt(1, onButton_2_Pressed, RISING);
}

void loop() {
  int copy_button_evt_counter;
  {
    /* Prevent change of button_evt_counter during readout. */
    CriticalSection crit_sec;
    copy_button_evt_counter = button_evt_counter;
  }
  Serial.println(copy_button_evt_counter);
}

void onButton_1_Pressed() {
  CriticalSection crit_sec;
  button_evt_counter++;
}

void onButton_2_Pressed() {
  CriticalSection crit_sec;
  button_evt_counter++;
}