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05-05-2015 01:09 PM
I set up the CP2108 with CP21xx Customization Utility and the CP2108 works fine. However, when it comes to saving the configuration to a .txt file, I get the following error and can't save the configuration.
5/5/15 10:53 AM: Save FAILED - null - C:\Silabs\testCP2108.txt
I have tried multiple folders including network drives and local discs, none of which works at all.
Could anyone help me on this?
05-05-2015 05:49 PM
It seems that the Customization Utility (Ver. 1.20) works fine with CP2104: I was able to save the configuration file for the CP2104 in .txt format. I still can't do so for the CP2108.
11-16-2015 09:25 AM
Hello to all,
I have the same problem!
Content of "Release_notes.txt"
CP21xx Customization Utility v1.2.1 Release Notes
Copyright (C) 2014 Silicon Laboratories, Inc.
I do not have other informations on version.
What can the user do?
11-16-2015 09:29 PM
Reproduce this issue with the tool in AN721SW downloaded from
But it works with the CP2110/4 Package in below link after installation.
Could you have a try?
01-20-2016 09:46 AM
I have also the same problem. Couldn't save configuration for CP2108. I get below text:
20.01.2016 08:42: Save FAILED - null - C:\SILABS CONFIGURATION.txt
at java.util.Hashtable.put(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
10-18-2016 03:12 AM
Please reference the latest AN721.pdf and use the Xpress Configurator within Simplicity Studio for cp2108 customization.
07-19-2017 02:52 PM
Any chance this bug can be fixed? All I need is to save and restore the configurations.
"Simplicity Studio" is anything but simple. Over 300MB of java eclipse nonsense and then it wants to download another 200MB of additional cruft just to program a couple registers. 45 minutes of downloading/installing/new project/select part blah blah I can now read the part. Still have to figure out how to program it and save the configuration.
Sorry for the rant, maybe this studio thing is useful for something else but is absurd for a quick utility to configure a chip.
07-24-2017 01:29 PM
The old utility is never getting updated, unfortunately, and the CP2108 config save is just broken. We can't even build the tool anymore. It was created by a contractor, and was apparently a nightmare to maintain, and was built using some specific older version of eclipse with some very specific build environment. Then someone decided to update our build machine and wiped the environment. So... hooray!
I know Studio is a monster download, but hopefully the new tool is a lot better experience. It's also super easy to maintain, and we usually publish bug fixes within a day or two after getting the report. We're also open to suggestions on how to improve it, as well.
07-24-2017 01:36 PM
kudos for the honest reply. I will try to make do with the eclipse one. looks like it has more settings or lower level. I just need to figure out where it saves the settings so that I can load them later from another machine.
07-24-2017 03:52 PM
It saves all the settings in the .document file. You can open this in Xpress configurator on another machine. There's also a .configuration file that can be used with the command-line tools in the AN721SW.zip for production programming. And, there's a request.xml file (or something like that) when you click on request parts at the bottom right, in case you want to order pre-programmed devices from us...