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SW-EK-TM4C123GXL: EK-TM4C123GXL won't get recognized using Windows 8.1. Please help...

Francisco Acevedo
Prodigy 20 points
Part Number: SW-EK-TM4C123GXL
Other Parts Discussed in Thread: EK-TM4C123GXL

Hello, I'm new to Tiva Microcontrollers.  Recently I bought an EK-TM4C123GXL and tried to connect it to my PC. The USB port detects a connection but does not recognize the device. I'm using Windows 8.1 OS and tried following different steps from some posts in the forum. So far, every attempt has been unsuccessful. The Device Manager only shows one Universal Serial Bus Error. I've tried to install the Stellaris icdi drivers but when I click to update in device manager, I get a notification that says "The best driver for your device is already installed. Unknown USB Device (Device Descriptor Request Failed)". This problem wont let me program the TM4C123GXL as the Microcontroller isn't recognized. Please, need help. Thanks!

  • 0
    TI__Guru 72500 points
    Try downloading this patch file: software-dl.ti.com/.../SW-TM4C-2.1.4.178.PATCH-1.0.zip
    Copy the file from the .zip file into the directory C:\Users\a0319960\Downloads\SW-TM4C-2.1.4.178.PATCH-1.0.zip\windows_drivers, replacing the existing files. Then uninstall the existing drivers and reinstall.
  • 0 in reply to Bob Crosby
    Prodigy 20 points
    Thank you for the help Bob. After testing various of the proposed solutions in different posts, and several trial and errors, I have found the solution. The problem is that the supplied USB cable that comes with the TIVA C Microcontroller is defective. I changed the cable and it all got recognized in Device Manager. I tested the connection sending a program to the TM4C123GXL and it worked.

    Solution: Changed the USB cable
  • 0 in reply to Francisco Acevedo
    Guru 117855 points

    Such "cable issues" have arrived here multiple times.      Might it make sense to, "Attempt to discover" such cables'  (plural) weakness?

    The issue may lie w/in (loss of continuity or too high resistance) between:

    • PC's +5V and board's USB receptacle 
    • PC's Gnd and board's USB receptacle
    • PC's USB Signal Levels and board's USB receptacle

    Should those prove "good" - might this suggest that the cable is distorting the signal transfer waveform - and that (somehow) a "Slower PC to Board" Transfer Rate should be employed?    ("IF" that can be employed?)

    Poster proved sufficiently resourceful, resolved - yet would not (such) added diagnostics (as herein presented)  - ease & reduce such pain/suffering for (all others?)     One wonders - too - if the (claimed) defective USB cable might work w/"a different" board, system and/or PC?      (we remain - "in the dark" as to the cable's weakness...)