add Ticker examples

APIs_Drivers/Ticker_Example/README.md

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+# Ticker example
+
+This example shows how to use Ticker with a callback. The example uses Ticker to cause periodic events, such as blinking an LED at a certain rate. In this example, the main while loop controls LED1, and the Ticker callback function controls LED2.

APIs_Drivers/Ticker_Example/main.cpp

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+/*
+ * Copyright (c) 2006-2020 Arm Limited and affiliates.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#include "mbed.h"
+
+// A class for flip()-ing a DigitalOut
+class Flipper {
+public:
+    Flipper(PinName pin) : _pin(pin)
+    {
+        _pin = 0;
+    }
+    void flip()
+    {
+        _pin = !_pin;
+    }
+private:
+    DigitalOut _pin;
+};
+
+DigitalOut led1(LED1);
+Flipper f(LED2);
+Ticker t;
+
+int main()
+{
+    // the address of the object, member function, and interval
+    t.attach(callback(&f, &Flipper::flip), 2.0);
+
+    // spin in a main loop. flipper will interrupt it to call flip
+    while (1) {
+        led1 = !led1;
+        ThisThread::sleep_for(200);
+    }
+}

APIs_Drivers/Ticker_HelloWorld/README.md

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+# Ticker example
+
+This example shows how to use Ticker to cause periodic events, such as blinking an LED at a certain rate. In this example, the main while loop controls LED1, and the Ticker callback function controls LED2.

APIs_Drivers/Ticker_HelloWorld/main.cpp

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+/*
+ * Copyright (c) 2006-2020 Arm Limited and affiliates.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#include "mbed.h"
+
+Ticker flipper;
+DigitalOut led1(LED1);
+DigitalOut led2(LED2);
+
+void flip()
+{
+    led2 = !led2;
+}
+
+int main()
+{
+    led2 = 1;
+    flipper.attach(&flip, 2.0); // the address of the function to be attached (flip) and the interval (2 seconds)
+
+    // spin in a main loop. flipper will interrupt it to call flip
+    while (1) {
+        led1 = !led1;
+        ThisThread::sleep_for(200);
+    }
+}

APIs_Drivers/Timeout_Example/README.md

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+# Timeout example
+
+This example shows how to use Timeout with a callback to schedule delayed events.
+

APIs_Drivers/Timeout_Example/main.cpp

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+/*
+ * Copyright (c) 2006-2020 Arm Limited and affiliates.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#include "mbed.h"
+
+// A class for flip()-ing a DigitalOut
+class Flipper {
+public:
+    Flipper(PinName pin) : _pin(pin)
+    {
+        _pin = 0;
+    }
+    void flip()
+    {
+        _pin = !_pin;
+    }
+private:
+    DigitalOut _pin;
+};
+
+DigitalOut led1(LED1);
+Flipper f(LED2);
+Timeout t;
+
+int main()
+{
+    // the address of the object, member function, and interval
+    t.attach(callback(&f, &Flipper::flip), 2.0);
+
+    // spin in a main loop. flipper will interrupt it to call flip
+    while (1) {
+        led1 = !led1;
+        ThisThread::sleep_for(200);
+    }
+}

APIs_Drivers/Timeout_HelloWorld/README.md

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+# Timeout example
+
+This example shows how to use Timeout to schedule delayed events.

APIs_Drivers/Timeout_HelloWorld/main.cpp

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+/*
+ * Copyright (c) 2006-2020 Arm Limited and affiliates.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#include "mbed.h"
+
+Timeout flipper;
+DigitalOut led1(LED1);
+DigitalOut led2(LED2);
+
+void flip()
+{
+    led2 = !led2;
+}
+
+int main()
+{
+    led2 = 1;
+    flipper.attach(&flip, 2.0); // setup flipper to call flip after 2 seconds
+
+    // spin in a main loop. flipper will interrupt it to call flip
+    while (1) {
+        led1 = !led1;
+        ThisThread::sleep_for(200);
+    }
+}

APIs_Drivers/Timer_HelloWorld/README.md

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+# Timer example
+
+This example shows how to use the Timer class to measure the time between when the `start()` and `stop()` functions are run. The Timer class counts from 0 up. 

APIs_Drivers/Timer_HelloWorld/main.cpp

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+/*
+ * Copyright (c) 2006-2020 Arm Limited and affiliates.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#include "mbed.h"
+
+
+Timer t;
+
+int main()
+{
+    t.start();
+    printf("Hello World!\n");
+    t.stop();
+    printf("The time taken was %f seconds\n", t.read());
+}