Can not connect to J-Link via USB. Applies to: Answer Information in this knowledgebase article applies to:. MDK-ARM. J-Link and J-Trace debugger SYMPTOM I try to debug an ARM7/9 device with uVision Debugger via J-Link. But starting a debug session or a flash download always fails with the following message in the Build Output window: Can not connect to J-Link via USB. CAUSE The J-Link device is probably configured for a J-Link USB ID other than 0.

Due to that, it can't be recognized by the uVision J-Link Debugger driver used for ARM7/9 devices. RESOLUTION Configure the J-Link for USB ID 0.

This can be done with the J-Link commander tool found in the MDK-ARM installation directory C: Keil ARM Segger JLink.exe. This will identify the J-Link with ID different than 0 and when connected, provides a command 'usbaddr' to change the ID: C: Keil ARM Seggerjlink SEGGER J-Link Commander V4.36l ('?' For help) Compiled Dec 2 2011 18:52:52 DLL version V4.40c, compiled Jan 24 2012 09:30:33 Firmware: J-Link ARM V6 compiled Feb 1 2011 14:28:14 Hardware: V6.00 S/N:. Feature(s): FlashBP, FlashDL J-Linkusbaddr=0 USB address successfully changed to '0'. Please unplug the device, then plug it back in.

J-Link After reconnecting the J-Link unit to the PC, debugging the ARM7/9 device with J-Link via the uVision Debugger should work. Please note that also the uVision J-Link Debugger driver used for Cortex-M devices has the ability to use J-Links with different USB ID and the ID can also be changed with J-Link Setup dialog. MORE INFORMATION. Refer to in the J-Link/J-Trace User's Guide. Liteon camera drivers for mac. ATTACHED FILES Request the to this knowledgebase article.

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Article last edited on: 2012-08-20 07:45:23.

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Contents. Why J-Link? In case you wonder why GNU MCU Eclipse decided to provide support to SEGGER J-Link, the short answer is: because of and of SWO. $ sudo dpkg -i /Downloads/jlink5.2.7x8664.deb The J-Link executables are installed in /usr/bin. In case you have a 64-bit machine and install the 32-bit SEGGER package, you might need several 32-bit libraries, depending on distribution.

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UDEV The install procedure automatically adds /etc/udev/rules.d/99-jlink.rules to define the USB IDs of the J-Link devices. No other drivers are required. Testing To test if J-Link is able to connect to a specific board, you generally need to specify the interface (JTAG or SWD) and the device name. By default, J-Link GDBServer will try JTAG but if only SWD is wired (which is very common on custom hardware), you would need to specify the interface (-if SWD). The device name is needed for targets which require special handling on connect (e.g. Due to silicon bugs which make auto-detection impossible).

For a list of available device names, please refer to the SEGGER page. Below is an example how to test a JTAG connection to a STM32F103 evaluation board (-device STM32F103RB) on macOS.