Error connecting to the target: Unable to access the DAP

Hi,

Target: TM4C129ENCPDT Tiva processor

Emulator: XDS100v2

IDE: Code Composer 5.5

Application Background: In this device we have an application that provides a user interface to our main product controller.  It receives/responds to messages over RS485 and USB ports while it communicates to the main controller over CAN.  This is all working fine.

I was given the task to add the proper enable and kick the watchdog to provide us with a safe reset in case the application hangs.  But after adding the code I thought was needed to enable the dog then I can no longer connect with Code Composer to flash/debug the next build over JTAG.  I receive the following error: Error connecting to the target: (Error - 1170 @ 0x0) Unable to access the DAP.  Reset the device, and retry the operation.

Here are the initialization steps in my watcdhog init function:

     // Enable the peripheral

    ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_WDOG0);

    // Load WDTLOAD with desired timeout count ~2.240M
    ROM_WatchdogReloadSet(WATCHDOG0_BASE, WATCHDOG_TIMEOUT_COUNT);

    // Configure watchdog timer to generate a reset by setting the
    // RESEN bit in the WDTCTL register
    ROM_WatchdogResetEnable(WATCHDOG0_BASE);

    // Enable the watchdog timer
    ROM_WatchdogEnable(WATCHDOG0_BASE);

I later realized that my watchdog kick function in my last build was nothing but an empty prototype so I assume or would expect the device to be constantly reset. However I can connect over our USB interface and the application seems to be working properly.

How can I recover this board and re-gain JTAG flash/debug capability?

Thank you.

Rafael