52
8.1
8.1.1
Troubleshooting
General procedure
CHAPTER 8
Support and FAQs
If you experience problems with J-Link, you should follow the steps below to solve
these problems:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
8.1.2
Close all running applications on your host system.
Disconnect the J-Link device from USB.
Disable power supply on the target.
Re-connect J-Link with the host system (attach USB cable).
Enable the power supply on the target.
Try your target application again. If the problem remains, continue the following
procedure.
Close all running applications on your host system again.
Disconnect the J-Link device from USB.
Disable power supply on the target.
Re-connect J-Link with the host system (attach the USB cable).
Enable the power supply on the target.
Start JLinkCF.exe .
If JLinkCF.exe displays the J-Link serial number, the J-Link is working properly
and cannot be the cause of the problem.
If the problem persists and you own an original product (not an OEM version),
see section Contacting support on page 53.
Typical problem scenarios
J-Link LED is off
Meaning:
The USB connection does not work.
Remedy:
Check the USB connection. Try to re-initialize J-Link by disconnecting and reconnect-
ing it. Make sure that the connectors are firmly attached. Check the cable connec-
tions on your J-Link and the host computer. If this does not solve the problem, check
if your cable is defect. If the USB cable is Ok, try a different host computer.
J-Link LED is flashing at a high frequency
Meaning:
J-Link could not be enumerated by the USB controller.
Most likely reasons:
a.) Another program is already using J-Link.
b.) The J-Link USB driver does not work correctly.
Remedy:
a.) Close all running applications and try to reinitialize J-Link by disconnecting and
reconnecting it.
b.) If the LED blinks permanently, check the correct installation of the J-Link USB
driver. Deinstall and reinstall the driver as described in chapter Setup on page 11.
J-Link does not connect to the target
Most likely reasons:
a.) The BDM cable is defect.
b.) The target hardware is defect.
Remedy:
Follow the steps described in section 8.1.1.
J-Link ColdFire BDM 26 (UM08009)
? 2004-2009 SEGGER Microcontroller GmbH & Co. KG