CCSv6.1 hangs when I click "Connect Target."

Greg Togtema

Other Parts Discussed in Thread: EK-TM4C123GXL, LMFLASHPROGRAMMER, SW-TM4C

I am trying to load firmware on a TM4C123g microcontroller through the JTAG lines using a separate TIVA C Series Launchpad dev board as an interface and while using the CCSv6.1 software.

I launch the launchpad.ccxml target configuration, but when I try to connect to the TM4C123g on my own circuit board, CCSv6.1 hangs (i.e. program not responding). Sometimes, if the program does not hang, I receive the error message "Error connecting to device" ( or something to that effect). On the rarest of times, I can connect to the device, but I cannot load a binary to the TM4C123.

I have probed the JTAG data lines using a scope, and while I have not analyzed the bits, I know that data is being sent through these lines and that my cabling is good.

Would you please suggest a plan of attack to begin fixing this problem?

Thanks,

- Greg

over 10 years ago

0 Amit Ashara over 10 years ago

TI__Guru**** 244440 points

Hello Greg,

Have you removed the VDD header on the launchPad board to power down the Main MCU on the LaunchPad?

Regards
Amit

0 Greg Togtema over 10 years ago in reply to Amit Ashara

Prodigy 90 points

If you are taking about the 1x2 jumper to the left of the TMS & TCK pins, then yes, I have removed that jumper.

0 Amit Ashara over 10 years ago in reply to Greg Togtema

TI__Guru**** 244440 points

Hello Greg,

OK, thanks for confirming the same. So as I red it, TCK, TMS, TDI, TDO and GND from LaunchPad are connected to your custom board (5 pins). Can you check and confirm if the TDI from the LaunchPad is connected to TDI of the custom board TM4C123 device (Pin PC2) and same for TDO.

Regards
Amit

0 Greg Togtema over 10 years ago

Prodigy 90 points

Could it have anything to do with that my launchpad.ccxml configuration uses the Cortex M4 processor? Should it be something else?

0 Amit Ashara over 10 years ago in reply to Greg Togtema

TI__Guru**** 244440 points

Hello Greg,

It could be. You can use the same ccxml as any of the TivaWare project examples for the custom board connect

Regards
Amit

0 Greg Togtema over 10 years ago in reply to Amit Ashara

Prodigy 90 points

TDO contacts the TDO pin (pin 49) on the uC, TDI contacts the TDI pin (pin 50). I checked this with a continuity meter.

Something strange I noticed: When I checked my cable assembly for short circuits between neighboring wires, there were none. But when I plugged it into the Launchpad and in my custom board, I would have various short circuits. The external power was disconnected. Sometimes the short circuit readings were 0.0ohms, sometimes it was 18.1ohms.

0 Greg Togtema over 10 years ago in reply to Amit Ashara

Prodigy 90 points

Would you please bear with me? Where do I find TivaWare examples?

0 Amit Ashara over 10 years ago in reply to Greg Togtema

TI__Guru**** 244440 points

Hello Greg,

As an example one of the existing TM4C123 examples can be found in the following path for TivaWare. D:\ti\TivaWare_C_Series-2.1.0.12573\examples\boards\ek-tm4c123gxl\interrupts\

Alternatively you can use the LMFlashProgrammer as it does not know anything about the end device till it queries it allowing you to download a bin file.

Your pin connections are correct. Where are you seeing the short?

Regards
Amit

0 Greg Togtema over 10 years ago in reply to Amit Ashara

Prodigy 90 points

I was seeing the short among various pins at various times. Could have been my technique.

Unfortunately, I do not have a TivaWare_C_Series-2.1.0.12573 folder in my c:\TI\ directory. I think this means I have not downloaded some software package I should have. If this is correct, would you please tell me which package I need?

Side note: The funny thing is, I had this system running two months ago, but I left it on the shelf.

0 Amit Ashara over 10 years ago in reply to Greg Togtema

TI__Guru**** 244440 points

Hello Greg,

I am not sure how you are checking for shorts so would not prefer to have comment there.

Instead of downloading the SW-TM4C I have attached my ccxml file for one of the projects. You would need to add it to your project. LMFlashProgrammer still needs to be downloaded and may require drivers from TI web site

TM4C Full Software
www.ti.com/.../sw-tm4c;tisearch=Search-EN-Everything

LM Flash Programmer.
www.ti.com/.../LMFLASHPROGRAMMER

Regards
Amit

0 Greg Togtema over 10 years ago in reply to Greg Togtema

Prodigy 90 points

Ok, I downloaded the TivaWare package and installed it. I copied the target_configuration.ccxml from its example directory. I tried connecting to my device and CCS still froze. I am beginning to think this is not related to the hardware side of things.

0 Amit Ashara over 10 years ago in reply to Greg Togtema

TI__Guru**** 244440 points

Hello Greg,

Can you take a snapshot of CCS and your setup and attach it to the post ("Use rich formatting" on bottom right of the reply pane)

When taking the CCS Snapshot of the ccxml make sure it is Advanced Mode for me to see the setting.

Regards
Amit

0 Greg Togtema over 10 years ago in reply to Amit Ashara

Prodigy 90 points

Hi Amit,

I won't be able to take the snapshot right now. Here is some updates.

1) I was able to stop CCS from freezing and crashing when I pressed "connect target." I believe I had to 'restart core,' or something to that effect.

2) I still receive "error connecting to target" messages.

3) I was able to flash my program to the second TM4C123 chip on the launchpad dev board (with the Vdd jumper reinserted). I could step through my program and it executed as expected.

I think it's time I start probing the bits being sent through the JTAG port. Do you have a reference where I can see the communication protocol and what signals should be sent when?

Thanks!
- Greg

0 Amit Ashara over 10 years ago in reply to Greg Togtema

TI__Guru**** 244440 points

Hello Greg,

I would not walk the path pf JTAG yet (it is a great self learning but takes its time). Did you attempt step-3 with the original setup?

W/o having or looking at the setup-board it is rather tough for me.

Regards
Amit

0 Greg Togtema over 10 years ago

Prodigy 90 points

I just want to thank you for your help. I chalked my issue up to bad cabling.

Regards

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CCSv6.1 hangs when I click "Connect Target."