mbed library sources, mbed-dev only for TYBLE16

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Please refer flowing link.
/users/kenjiArai/notebook/tyble16-module-will-become-a-mbed-family--mbedliza/

Revision:
175:af195413fb11
Parent:
170:19eb464bc2be
Child:
176:447f873cad2f
--- a/drivers/UARTSerial.h	Mon Oct 02 15:33:19 2017 +0100
+++ b/drivers/UARTSerial.h	Wed Oct 11 12:45:49 2017 +0100
@@ -56,6 +56,12 @@
      */
     virtual short poll(short events) const;
 
+    /* Resolve ambiguities versus our private SerialBase
+     * (for writable, spelling differs, but just in case)
+     */
+    using FileHandle::readable;
+    using FileHandle::writable;
+
     /** Write the contents of a buffer to a file
      *
      *  @param buffer   The buffer to write from