Difference between revisions of "OpenOCD"
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= Using J-Link with OpenOCD = |
= Using J-Link with OpenOCD = |
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| − | In general, it is possible to use J-Link with OpenOCD. OpenOCD handles J-Link as a dumb JTAG/SWD/... probe and only uses the very low level logic to output JTAG/SWD/... sequences. It does not make use of any high level logic etc. and therefore is much slower than the proprietary SEGGER J-Link DLL / GDBServer / ... implementation |
+ | In general, it is possible to use J-Link with OpenOCD. OpenOCD handles J-Link as a dumb JTAG/SWD/... probe and only uses the very low level logic to output JTAG/SWD/... sequences. It does not make use of any high level logic etc. and therefore is much slower than the proprietary SEGGER J-Link DLL / GDBServer / ... implementation. |
| + | == Switching the USB driver to OpenOCD == |
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| − | '''Note:''' Once the J-Link USB driver has been replaced, no SEGGER software from the J-Link software package will be able to communicate with J-Link anymore. To use SEGGER J-Link software again, the USB driver needs to be switched back to its default. |
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| + | In order to use J-Link with OpenOCD the standard J-Link USB driver must be replaced with the WinUSB driver, using 3rd party utilities. There are lots of walkthroughs available on the internet. |
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| + | |||
| + | == Restoring the USB driver == |
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| + | Once the J-Link USB driver has been replaced, no SEGGER software from the J-Link software package will be able to communicate with J-Link anymore.<br> |
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| + | To use SEGGER J-Link software again, the USB driver needs to be switched back to its default.<br> |
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| + | This can be achieved by |
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| + | * navigating to the J-Link software installation (by default C:\Program Files\SEGGER\JLink\) |
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| + | * navigating to the sub folder USBDriver\ |
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| + | * Double clicking InstDrivers.exe |
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== Limitations == |
== Limitations == |
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Revision as of 10:23, 23 March 2023
Contents
About
OpenOCD is a open and free project to support different debug probes under one "API".
Using J-Link with OpenOCD
In general, it is possible to use J-Link with OpenOCD. OpenOCD handles J-Link as a dumb JTAG/SWD/... probe and only uses the very low level logic to output JTAG/SWD/... sequences. It does not make use of any high level logic etc. and therefore is much slower than the proprietary SEGGER J-Link DLL / GDBServer / ... implementation.
Switching the USB driver to OpenOCD
In order to use J-Link with OpenOCD the standard J-Link USB driver must be replaced with the WinUSB driver, using 3rd party utilities. There are lots of walkthroughs available on the internet.
Restoring the USB driver
Once the J-Link USB driver has been replaced, no SEGGER software from the J-Link software package will be able to communicate with J-Link anymore.
To use SEGGER J-Link software again, the USB driver needs to be switched back to its default.
This can be achieved by
- navigating to the J-Link software installation (by default C:\Program Files\SEGGER\JLink\)
- navigating to the sub folder USBDriver\
- Double clicking InstDrivers.exe
Limitations
There are several limitations that apply when using J-Link with OpenOCD instead of the SEGGER J-Link software:
- Much slower than using J-Link with the SEGGER J-Link DLL
- No RTT support
- No HSS support
- No unlimited flash breakpoints support
- No support for any utilities from the SEGGER J-Link software package
- No support from SEGGER
Support
Please understand that SEGGER does not provide any support for J-Links used with OpenOCD. The OpenOCD software is released and maintained by a 3rd party. In order to get support, we recommend to get in touch with the OpenOCD community.
