Repeatable "Channel Inactive" "blips" on digital channels cause SPI decoder to be thrown off

[dario]

Hi All,

Everytime I use a digital channel in a free running capture there seems to always be a drop in communication (or something) towards the beginning of the capture. This seems to happen towards the beginning of the capture and has a tendency to throw of the SPI decode (SPI with no CS) and can’t be easily recovered since deleting data before/after a point in the capture is not yet possible with the Logic MSO app (deleting data before/after tended to resolve framing issues on the logic pro).

Note that this does not seem to happen in triggered mode, at least as far as I have seen.

Model	Logic MSO
Serial Number	7USVN
Hardware Revision	Rev0B/Rev0F
Analog Channels	4
Analog Bandwidth	200 MHz
Analog Sample Rate	1.6 GS/s
Analog Vertical Resolution	12 Bit
Maximum Analog Buffer Size	1 Billion Samples
Firmware Version	1.0.54

{“Environment”:“production”,“Branch”:“master”,“Commit”:“a2af641e0c8b389637c5f0f2cbd390b7d33f5ee3”,“Version”:“2.4.42”,“AutomationVersion”:“1.0.0”,“MachineID”:“7e272189-c463-4698-a587-4ba447ab2844”,“PID”:70275,“LaunchId”:“9d6cef73-e3f8-423a-8596-e5e15faa4f2b”,“Architecture”:“arm64”}

[timreyes]

@dario Sorry about this issue! Are the gaps rougly 12ms long like in the image below?

If so, the gaps at the data start are unfortunately a known issue right now. We do plan to get it fixed! Let me check on our timeline for that and we can provide an update on that for you.

[dario]

Yep exactly 12ms. Thanks for the the info on this.

The main issue with this is when there’s a digital decode enabled it can get misaligned with the data if it’s a decode like SPI without a CS.

Being able to trim the data like with Logic Analyzer UI would help get things re-aligned (protocol analyzer wise) in the meantime.

This does not happen in trigger mode so when I really need it to decode stuff properly I can go about it that way.

[gary.grimm]

Looks like this is still an issue. I bought 4x MSOs earlier this year but folks on my team are refusing to use these and stealing oscilloscopes from the lab due to issues like this. This really makes it difficult to use analyzers with the MSO. To see this reported as a known issue back in April with no fix in September is beyond disappointing.