TI TM4C Unlock

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  • TI TM4C Unlock

    I have a bad image (I suspect invalid clock settings) in a TI TM4C123GH6PM. Is there a way to unlock this with the JLink?
    I did try the LM3Sxxx unlock procedure multiple times without success.
    Reference:
    e2e.ti.com/support/microcontrollers/tiva_arm/f/908/t/310876
    ti.com/lit/gpn/tm4c123gh6pm (Section 4.3.4.3 Recovering a "Locked" Microcontroller)

    Source Code

    1. Device "TM4C123GH6PM" selected.
    3. Found SWD-DP with ID 0x2BA01477
    5. ****** Error: DAP error while reading AHB-AP IDR.
    6. Found SWD-DP with ID 0x2BA01477
    7. Found SWD-DP with ID 0x2BA01477
    8. Found SWD-DP with ID 0x2BA01477
    9. Can not connect to target.

    The post was edited 1 time, last by efc3 ().

  • Hi,


    currently, we do not provide a specific utility to unlock TI TM4C123 devices.
    However, you can try to do the unlock sequence using
    a) J-Flash Init steps
    b) JTAGLoad, which is part of the J-Link software & documentation pack
    c) J-Link commander, as described in this post.

    Best regards,
    Niklas
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  • Thank you for the information. I have tried multiple approaches without any luck. My latest attempt is attached.

    It would be very helpful to have this support within JLink commander as it is for several other MCUs. I may need to resort to a TI development board so I can use their unlock utility with the onboard debugger.
    Files