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Low end PC-compatible Logic Analyzer suggestions
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J-R:
Thoughts on the Digilent Analog and Digital Discovery devices for this purpose?
tautech:

--- Quote from: MathWizard on September 05, 2022, 04:53:04 pm ---I have a Siglent scope that can decode I2C, but so far, if I'm doing it right, I find the time base is way too short to capture what's going on, using single shot.

--- End quote ---
Like Nico says, are you using Zoom mode ?
You should be using something like 50ms/div then press Zoom where the timebase control switches to the zoomed window where you can zoom into each packet and pan around the record.

However it's best you get rock solid triggering sorted first before using Zoom as for most protocols requires a falling edge trigger, signal thresholds set correctly with the packet vertical amplitude and most importantly Holdoff applied to prohibit retriggering within a packet.

Show us some screenshots with appropriate menus visible.
Pitrsek:

--- Quote from: J-R on September 05, 2022, 07:38:18 pm ---Thoughts on the Digilent Analog and Digital Discovery devices for this purpose?

--- End quote ---
I've bought digital discovery and so far I'm happy with it. I used it mostly to configure SPI devices, so my LA usage is so far limited. No issue with sw so far, seems well made. The ability to make a quick script to configure your SPI devices is super nice.
Fungus:

--- Quote from: MathWizard on September 05, 2022, 04:53:04 pm ---I see there's people with Arduino LA projects. That's interesting too, but in a week or 2, I'm going to order something, even if it is just a $20 LA again, I could use it for now on big MCU's like on a mobo.

--- End quote ---

Yep. Get one of those cheapo 24Mhz, 8bit analyzers and see how it goes. They're about $6 on Aliexpress. Use "Pulseview"software.

https://www.aliexpress.com/wholesale?SearchText=logic+analyzer

If it doesn't work out then you only lost $6.
tggzzz:
The OP might like to consider one of the "bus pirate" family of devices.

Downloadable "personalities" are available, and they can also generate signals.

For the avoidance of doubt, I haven't used them.
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