add Digital In Out examples

Author: maciejbocianski

APIs_Drivers/DigitalInOut_ex_1/README.md

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+# DigitalInOut example
+
+The DigitalInOut API can be used to both read and write a digital pin. Use the output() and input() function calls to switch modes and then use just like you would DigitalIn or DigitalOut.

APIs_Drivers/DigitalInOut_ex_1/main.cpp

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+/*
+ * Copyright (c) 2006-2020 Arm Limited and affiliates.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include "mbed.h"
+
+DigitalInOut mypin(LED1);
+
+int main()
+{
+    // check that mypin object is initialized and connected to a pin
+    if (mypin.is_connected()) {
+        printf("mypin is initialized and connected!\n\r");
+    }
+
+    // Optional: set mode as PullUp/PullDown/PullNone/OpenDrain
+    mypin.mode(PullNone);
+
+    while (1) {
+        // write to pin as output
+        mypin.output();
+        mypin = !mypin; // toggle output
+        ThisThread::sleep_for(500);
+
+        // read from pin as input
+        mypin.input();
+        printf("mypin.read() = %d \n\r", mypin.read());
+        ThisThread::sleep_for(500);
+    }
+}

APIs_Drivers/DigitalIn_ex_1/README.md

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+# DigitalIn example
+
+This example shows how to use digital input to monitor push button state.

APIs_Drivers/DigitalIn_ex_1/main.cpp

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+/*
+ * Copyright (c) 2006-2020 Arm Limited and affiliates.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include "mbed.h"
+
+DigitalIn  mypin(SW2); // change this to the button on your board
+DigitalOut myled(LED1);
+
+int main()
+{
+    // check mypin object is initialized and connected to a pin
+    if (mypin.is_connected()) {
+        printf("mypin is connected and initialized! \n\r");
+    }
+
+    // Optional: set mode as PullUp/PullDown/PullNone/OpenDrain
+    mypin.mode(PullNone);
+
+    // press the button and see the console / led change
+    while (1) {
+        printf("mypin has value : %d \n\r", mypin.read());
+        myled = mypin; // toggle led based on value of button
+        ThisThread::sleep_for(250);
+    }
+}

APIs_Drivers/DigitalIn_ex_2/README.md

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+# DigitalIn example
+
+This example shows how to use digital inputs to implement logical functions.

APIs_Drivers/DigitalIn_ex_2/main.cpp

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+/*
+ * Copyright (c) 2006-2020 Arm Limited and affiliates.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include "mbed.h"
+
+DigitalIn a(D0);
+DigitalIn b(D1);
+DigitalOut z_not(LED1);
+DigitalOut z_and(LED2);
+DigitalOut z_or(LED3);
+DigitalOut z_xor(LED4);
+
+int main()
+{
+    while (1) {
+        z_not = !a;
+        z_and = a && b;
+        z_or = a || b;
+        z_xor = a ^ b;
+    }
+}

APIs_Drivers/DigitalOut_ex_1/README.md

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+# DigitalOut example
+
+This example shows how to use DigitalOut to drive the LED.

APIs_Drivers/DigitalOut_ex_1/main.cpp

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+/*
+ * Copyright (c) 2006-2020 Arm Limited and affiliates.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include "mbed.h"
+
+DigitalOut myled(LED1);
+
+int main()
+{
+    // check that myled object is initialized and connected to a pin
+    if (myled.is_connected()) {
+        printf("myled is initialized and connected!\n\r");
+    }
+
+    // Blink LED
+    while (1) {
+        myled = 1;          // set LED1 pin to high
+        printf("myled = %d \n\r", (uint8_t)myled);
+        ThisThread::sleep_for(500);
+
+        myled.write(0);     // set LED1 pin to low
+        printf("myled = %d \n\r", myled.read());
+        ThisThread::sleep_for(500);
+    }
+}