Technical Note 67644

USB device (dongle/JTAG) related to EW-product do not respond

EW targets: All
EW component: Embedded Workbench & GUI
Keywords: dongle, J-Link, USB
Last update: December 4, 2009

Sometimes a USB device (such as a dongle or JTAG) related to the EW do not respond.
A typical situation when the USB system can become shaken, is when a Windows update is installed.

First action
First of all try to trouble shoot according to the documentaion/Tech-Notes for the USB device in use.

Trouble shoot the SuperPro USB-dongle with Tech Note 62867.

Trouble shoot the J-Link-ARM with \arm\doc\J-Link_J-TraceARM-2.pdf and Tech Notes 76557 and 41987.

Next action

Attach the USB device.

In the Device Manager uninstall this USB device.

Remove the USB device.

(Sometimes needed.) Restart the computer. Possibly you also need some (4-5) minutes of power down for the computer.

Attach the USB device and install the drivers when the Windows Wizard has started.

Third action

Unplug all USB devices, (keep mouse and keyboard).

Go into Control panel/system/device manager

Change presentation at menu View to 'Devices by connection' (See picture at link 'Device Manager alternative' .)

Attach the troublesome USB device.

Expand the list until you find the non-respronsive USB device. (See example in picture at link 'Device Manager alternative' .)

Uninstall at a higher level, i.e. the 'Standard universal PCI to...".´, is to be uninstalled (and later reinstalled by the Windows system).


Plug in the USB device and the Windows Wizard asks for the driver.

Install the driver.

Fourth action

Restart PC

Enter 'Safe Mode'

Check for (and remove) USB devices that might exist (and only show up in 'Safe Mode') as USB devices that have not been correctly un-plugged.

Actions beyond this tech note

If there are still USB probelms contact your local IAR support department, and request details on more to do.

Please Note
This tech note has been tested with the SuperPro USB-dongle and the J-Link-ARM. The suggestions above might (or not) work for other USB devices used in conjuction with EW:s.
For example the JTAGICE-mkII (EWAVR) and the PE-USB-BDM-probe (EWHCS12) uses a driver named 'Jungo' which might need other treatment. (At time of writing this has not been tested by IAR.)

Device Manager alternative
(GIF, 27 KB)

Related Support notes:

Technical note 41987
Updated J-Link drivers for EWARM

Technical note 62867
"No valid license found for this product"

Technical note 76557
Best performance of the J-Link (v. 4xx and 5.xx)