• State Suggested Answer
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 120 subscribers
  • Views 26801 views
  • Users 0 members are here
2025 survey

We are running a survey to help us improve the experience for all of our members. If you see the survey appear, please take the time to tell us about your experience if you can.

Options
Related
How was your experience today?
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

How change ULINK2 JTAG TCK ?

debugasm

Hi,

How to change the clock frequency of a JTAG connection with ULINK2 ?

I made a measurement using an oscilloscope on the TCK pin and the clock frequency is 600 KHz.

How to select or set a different frequency ?

I can't find where to select it.

debugasm

  • 0 Arm Employee Badge

    Hi debugasm

    Arm DS provides some different ways to connect to a target:
    1. Using ready-made debug connection information from CMSIS Packs (which is what you are currently using)
    2. Using ready-made debug connection information from the Debugger's "configdb"
    3. Using a custom debug connection via the Platform Configuration Editor.

    The clock speed is hard-coded for 1 (for example, see the jtag_clock entry in Development Studio Workspace\.metadata\.plugins\com.arm.debug.cmsis\DS-MDK\SAMA5_DFP_ATSAMA5D27, but you could try changing this) and 2, but can be configured via the GUI with 3.

    See developer.arm.com/.../configure-your-debug-hardware-unit-for-platform-autodetection

    Hope this helps

    Stephen