Merge pull request #2 from aashishc1988/IdleLoop

Idle loop

Author: Cruz Monrreal

IdleLoop/README.md

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+# IdleLoop example #
+
+IdleLoop usage example for Mbed OS
+
+This is an example showing the purpose of IdleLoop thread that is scheduled when no other threads are ready to run. In this example, we have a regular thread that is scheduled to run every 5 seconds. Because no other thread is scheduled to run, IdleLoop runs and toggles the LED.

IdleLoop/main.cpp

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+#include "mbed.h"
+#include "rtos_idle.h"
+
+// LED for main thread
+DigitalOut led2(LED2);
+// LED for idle thread
+DigitalOut led1(LED1);
+LowPowerTicker watchdogTicker;
+Thread watchdogThread;
+EventQueue watchdogQueue;
+
+void watchdogRefreshHandler() {
+    led2 = !led2;
+};
+
+void watchdogRefreshIsr() {
+    watchdogQueue.call(callback(&watchdogRefreshHandler));
+};
+
+void new_idle_loop()
+{
+    // Executes when no other thread is running
+    led1 = !led1;
+}
+
+int main() {
+
+    watchdogThread.start(callback(&watchdogQueue, &EventQueue::dispatch_forever));
+    watchdogTicker.attach(callback(&watchdogRefreshIsr), 5);
+    rtos_attach_idle_hook(&new_idle_loop);
+}