CCS/EK-TM4C129EXL: TM4C129ENCPDT: Debugger issue

Hi Raveena,
Was it working before until you suddenly changed your program? If this is the case, do you remember what you changed? Is it possible that you re-purpose the JTAG pins (PC[3:0]) for GPIO? Normally, JTAG can be locked out if you repurpose the JTAG pins for GPIO.

Have you tried to unlock the device?

Please also reference this post below.
e2e.ti.com/.../801138

 Hi Charles,

"Was it working before until you suddenly changed your program?" - yes, it was working before, suddenly it stopped working.

"If this is the case, do you remember what you changed?" - haven't changed anything in the code, neither am able to load old binaries using LM flash programmer, nor am able to debug using ccs, have tried both versions of ccs 7 and 8.

Is it possible that you re-purpose the JTAG pins (PC[3:0]) for GPIO? - No, haven't used these gpio's in the code.

I have tried unlocking the device too, still the issue is same.

on lm flash programmer

 

on CCS while I tried to debug.

I tried with blinky example from the standard library.

Hi,

 Have you tried using another PC computer? I want to make sure if the problem is with the board or with Windows driver. Do you see the Stellaris In-Circuit Debug Interface like below in your device manager? 

Hi Charles,
issue is resolved now.
let me explain the entire situation, for the past 4 months, I have used the same eval board to program other customised board using JTAG. I have never connected the eval board and customised board on common ground. but reset and other JTAG pins were apt. suddenly it stopped working, after checking app note as advised by you, I have connected them on common ground and everything works fine both debug on ccs and flashing the binaries with lm flash programmer. can you please elaborate on this sudden issue?
thank you

Thanks for the timely response charles. issue is resolved