J-Link-OB-K22-CortexM

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This article describes specifics of the J-Link OB CortexM (See https://www.segger.com/products/debug-probes/j-link/models/j-link-ob/#model-overview-supported-cores).

Drag and drop programming support

This J-Link OB model optionally supports the drag & drop programming feature. For more information about host OS specifics, potential limitations, ... please refer to the drag and drop programming wiki article.

SN 900031732 to 900032331

These J-Link OB have been mounted on eval boards from Ambiq Micro and some of these report no virtual COM port (VCOM) by accident.

An in-field fix has been implemented V7.66g and later.

How to apply the fix:

  • Start J-Link Commander
  • If this message is shown, one of the "buggy" OBs has been detected and corrected:
    JLink-OB-K22-CortexM 900031732 to 900032331 AutoCorrect.png
  • Power-cycle the J-Link OB (unplug and re-plug USB connector of eval board)
  • Now the J-Link OB will also expose a virtual COM port (COM port number from screenshot below may differ):
    JLink-OB-K22-CortexM 900031732 to 900032331 VCOMPort.png
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