USB Logic Analyzer Unreliable

Components & Accessories Tools
1

Hi,

I recently received the USB Logic Analyzer and I am using it with sigrok PulseView. I have followed the instructions to get the WinUSB driver installed which has worked. I had to do this twice as per suggestions on the site.

When I start PulseView first, then connect the analyser, I can select using the fx2lafw driver from the dropdown menu. If I select something like 200k samples with 20kHz sampling, I sometimes get the clock signal I am expecting, or something close at least. However, this rarely works the second time I try. I have not got it to work at anything above 20kHz sampling. If I click run for a second time, or try changing the sampling parameters, I get no data captured and the software often hangs and I have to close using Task Manager.

I have also tried multiple USB ports and multiple channels.

It may well be something I am doing wrong, but the analyser is currently very unreliable.

Thanks

Dave

2

It sound like it might be a defective unit; was it purchased from us? If so head over to www.sparkfun.com/returns (contact vendor if purchased elsewhere) and we’ll get ya squared away

3

Possible Solution:

I just got my Logic Analyzer, and was having what seems to be the same problem. I rolled back from the PulseView nightly build to pulseview-0.4.2-32bit-static-release-installer.exe and it’s working fine now. With the 0.4.2 build, the Run button changes to Stop when pressed (didn’t happen with the nightly build, even when it worked). It looks like something similar was recently reported on the sigrok site for the 64 bit version.

It’s working every time now, and I’m successfully decoding the I2C data being sent from the RedBoard Plus to the MCP4725 DAC through the I2C hub.