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diff --git a/tmk_core/tool/mbed/mbed-sdk/libraries/tests/libs/SerialHalfDuplex/SerialHalfDuplex.h b/tmk_core/tool/mbed/mbed-sdk/libraries/tests/libs/SerialHalfDuplex/SerialHalfDuplex.h
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+++ b/tmk_core/tool/mbed/mbed-sdk/libraries/tests/libs/SerialHalfDuplex/SerialHalfDuplex.h
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+/* mbed Microcontroller Library - SerialHalfDuplex
+ * Copyright (c) 2010-2011 ARM Limited. All rights reserved.
+ */
+#ifndef MBED_SERIALHALFDUPLEX_H
+#define MBED_SERIALHALFDUPLEX_H
+
+#include "platform.h"
+
+#if DEVICE_SERIAL
+
+#include "Serial.h"
+#include "gpio_api.h"
+
+namespace mbed {
+
+/** A serial port (UART) for communication with other devices using
+ * Half-Duplex, allowing transmit and receive on a single
+ * shared transmit and receive line. Only one end should be transmitting
+ * at a time.
+ *
+ * Both the tx and rx pin should be defined, and wired together.
+ * This is in addition to them being wired to the other serial
+ * device to allow both read and write functions to operate.
+ *
+ *  For Simplex and Full-Duplex Serial communication, see Serial()
+ *
+ *  Example:
+ * @code
+ * // Send a byte to a second HalfDuplex device, and read the response
+ *
+ * #include "mbed.h"
+ *
+ * // p9 and p10 should be wired together to form "a"
+ * // p28 and p27 should be wired together to form "b"
+ * // p9/p10 should be wired to p28/p27 as the Half Duplex connection
+ *
+ * SerialHalfDuplex a(p9, p10);
+ * SerialHalfDuplex b(p28, p27);
+ *
+ * void b_rx() { // second device response
+ *     b.putc(b.getc() + 4);
+ * }
+ *
+ * int main() {
+ *     b.attach(&b_rx);
+ *     for (int c = 'A'; c < 'Z'; c++) {
+ *         a.putc(c);
+ *         printf("sent [%c]\n", c);
+ *         wait(0.5);   // b should respond
+ *         if (a.readable()) {
+ *             printf("received [%c]\n", a.getc());
+ *         }
+ *     }
+ * }
+ * @endcode
+ */
+class SerialHalfDuplex : public Serial {
+
+public:
+    /** Create a half-duplex serial port, connected to the specified transmit
+     * and receive pins.
+     *
+     * These pins should be wired together, as well as to the target device
+     *
+     *  @param tx Transmit pin
+     *  @param rx Receive pin
+     */
+    SerialHalfDuplex(PinName tx, PinName rx);
+
+protected:
+    gpio_object gpio;
+
+    virtual int _putc(int c);
+    virtual int _getc(void);
+
+}; // End class SerialHalfDuplex
+
+} // End namespace
+
+#endif
+
+#endif