[task] added idle cycle task example

Chapter04-Task/03-rtos-task-idle-cycle/03-rtos-task-idle-cycle.ino

@@ -0,0 +1,72 @@
+// ====================================================
+// ArduRTOS Copyright(C) 2018 Furkan Türkal
+// This program comes with ABSOLUTELY NO WARRANTY; This is free software,
+// and you are welcome to redistribute it under certain conditions; See
+// file LICENSE, which is part of this source code package, for details.
+// ====================================================
+
+#include <Arduino_FreeRTOS.h>
+
+static const char *pcTextForTask = "Task Ran!";
+
+volatile uint32_t ulIdleCycleCount = 0ul;
+
+void vTask(void *pvParamethers);
+
+void setup() { 
+  xTaskCreate(
+    vTask,
+    (const portCHAR *) "Task",
+    100,
+    (void *)pcTextForTask,
+    1,
+    NULL
+  );
+
+  vTaskStartScheduler();
+}
+
+void loop() {
+  // Must be empty to run Tasks correctly
+}
+
+void vApplicationIdleHook(void){
+  ulIdleCycleCount++;
+}
+
+void vTask(void *pvParameters){
+  (void) pvParameters;
+  const char *pcTaskName = "Task1 Ran!";
+
+  const TickType_t xDelay250MS = pdMS_TO_TICKS(250);
+
+  Serial.begin(9600);
+  Serial.println("Task[vTask]::Initialized!");
+
+  for(;;){
+    Serial.println(pcTaskName);
+    Serial.println(ulIdleCycleCount);
+    //vPrintStringAndNumber(pcTaskName, ulIdleCycleCount);
+    vTaskDelay(xDelay250MS);
+  }
+}
+
+void vTaskPeriodic(void *pvParameters){
+  (void) pvParameters;
+  const char *pcTaskName = "Task2 Ran!";
+
+  const TickType_t xDelay3ms = pdMS_TO_TICKS(1000);
+
+  TickType_t xLastWakeTime = xTaskGetTickCount();
+
+  Serial.begin(9600);
+  Serial.println("Task[vTaskPeriodic]::Initialized!");
+
+  for(;;){
+    vTaskDelayUntil(&xLastWakeTime, xDelay3ms);  
+
+    Serial.print(xLastWakeTime);
+    Serial.println(pcTaskName);
+  }
+}
+