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libraries/FreeRTOS/examples/Notifications/Notifications.ino

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+/**
+   Example of a Arduino interruption and RTOS Task Notification.
+   https://www.freertos.org/RTOS_Task_Notification_As_Binary_Semaphore.html
+*/
+
+// Include Arduino FreeRTOS library
+#include <Arduino_FreeRTOS.h>
+
+/**
+   Declaring a global TaskHandle for the led task.
+*/
+TaskHandle_t taskNotificationHandler;
+
+void setup() {
+
+  // Configure pin 2 as an input and enable the internal pull-up resistor.
+  pinMode(2, INPUT_PULLUP);
+
+  // Create task for FreeRTOS notification
+  xTaskCreate(TaskNotification, // Task function
+              "Notification", // Task name
+              128, // Stack size
+              NULL,
+              3, // Priority
+              &taskNotificationHandler ); // TaskHandle
+}
+
+void loop() {
+
+}
+
+/*
+   Notification task.
+*/
+void TaskNotification(void *pvParameters)
+{
+  (void) pvParameters;
+
+  int digitalPin = 2;
+
+  Serial.begin(9600);
+
+  attachInterrupt(digitalPinToInterrupt(digitalPin), digitalPinInterruptHandler, LOW);
+
+  for (;;) {
+
+    if (ulTaskNotifyTake(pdTRUE, portMAX_DELAY)) {
+      Serial.println("Notification received");
+    }
+
+  }
+}
+
+
+void digitalPinInterruptHandler() {
+  BaseType_t xHigherPriorityTaskWoken = pdFALSE;
+  vTaskNotifyGiveFromISR(taskNotificationHandler, &xHigherPriorityTaskWoken);
+  if (xHigherPriorityTaskWoken) {
+    taskYIELD();
+  }
+}