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EK-TM4C123GXL: Made changes to J-TAP pins PC0-3 on TM4C123GXL

Ahmad Abuaish
Prodigy 30 points
Part Number: EK-TM4C123GXL

Hi guys,

I'll describe my issue below.

I'm using IAR toolset to write firmware for my Tiva C TM4C123GXL development board. I have been able to write and upload firmware to the Tiva C board successfully until I attempted to configure the PWM drive on the C port pin 4 and 5. However, I realized that I've changed the alternate function configuration for pins PC 4-5 and PC0-3. Consequently, IAR failed to upload programs to the board giving the following error in a pop-up window:

- Fatal error: Can not connect to J-Link via USB.

After doing some research, I found out that Pins PC0-3 were used by the JTAG link and I've reconfigured it associated pins. I found a solution on the forum that suggests reinstalling the original drivers using the LM flash programmer (e2e.ti.com/.../286110). Now, I'm having issues using the LM Flash Programmer. I can't find the StellarisWare package for the Tiva C TM4C123GXL. I only found the StellarisWare package at (www.ti.com/.../sw-lm3s) which is for ARM m3 cores.

So, the solution that I'm trying implement is to use LM Flash Programmer to load the original StellarisWare drivers. I'll search more to find StellarisWare for Tiva C TM4C123GXL.

I'm not sure if what I'm doing will solve my issue. If what I'm doing is correct, can someone please direct me where I can find StellarisWare for Tiva C TM4C123GXL.

Kind regards, and I look forward to hearing from you guys.

Ahmad

  • 0
    Guru 117855 points
    There is supposed to be a, "Protection Mechanism" which guards against such "change from JTAG/SWD for pins PC0-PC3." Such change is not supposed to take effect unless you perform a special action - which intends to prevent, "inadvertent change."

    It would seem that finding the proper code and files for TM4C123 should not be so hard - perhaps your search w/in "Forum Search Box" (atop the forum page) keyword, "LM Flash Programmer" - will prove fruitful. (that's my hope - feel your pain - never fun...)
  • 0 in reply to cb1_mobile
    Prodigy 30 points
    Thanks for the prompt reponse. I found the solution in following post:
    e2e.ti.com/.../310876
  • 0 in reply to Ahmad Abuaish
    Guru 117855 points
    Good for you - the "Forum Search Box" is (clearly) inadequately promoted.

    It is "great" of you to provide such "posting detail" - which will prove useful to others! (sure to suffer your plight) Good job & good luck, mon ami.