GPIO JTAG Recovery

This example demonstrates changing the JTAG pins into GPIOs, along with a
mechanism to revert them to JTAG pins.  When first run, the pins remain in JTAG
mode.  Pressing the user push button will toggle the pins between JTAG mode and
GPIO mode.  Because there is no debouncing of the push button (either in
hardware or software), a button press will occasionally result in more than one
mode change.

In this example, all five pins (PB7, PC0, PC1, PC2, and PC3) are switched,
though the more typical use would be to change PB7 into a GPIO.  Note that
because of errata in Rev Bx and Rev C0 Stellaris microcontrollers, JTAG and SWD
will not function if PB7 is configured as a GPIO.  This errata will be fixed in
the next revision, available by Q2'07.

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Copyright (c) 2006 Luminary Micro, Inc.  All rights reserved.

Software License Agreement

Luminary Micro, Inc. (LMI) is supplying this software for use solely and
exclusively on LMI's Stellaris Family of microcontroller products.

The software is owned by LMI and/or its suppliers, and is protected under
applicable copyright laws.  All rights are reserved.  Any use in violation of
the foregoing restrictions may subject the user to criminal sanctions under
applicable laws, as well as to civil liability for the breach of the terms and
conditions of this license.

THIS SOFTWARE IS PROVIDED "AS IS".  NO WARRANTIES, WHETHER EXPRESS, IMPLIED OR
STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY
AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE.  LMI SHALL NOT, IN
ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES,
FOR ANY REASON WHATSOEVER.

This is part of revision 852 of the Stellaris Driver Library.