As a side note, I want that reasonably priced <https://github.com/ataradov/usb-sniffer>.. I've felt the need for one several times (I've always enjoyed work which involves looking at problematic low level traffic data, for some weird reason). But soldering a QFN chip is not something I'm set up to do, unfortunately. However, apparently AliExpress sells them pre-built.. though Taradov himself states "Do not buy CY7C68013A from eBay or AliExpress, they all are either fake or sketchy". I wonder if that also applies to pre-built boards including that MCU.
The sketchy part comes from no buffering/clamping/conditioning of inputs on those $5 "logic analyzer" ebay boards. Means you only get CMOS compatible signal levels* and might fry it with bad signal, but at prices like this https://pl.aliexpress.com/item/1005003649856071.html blowing a few is a non issue.
* meaning you need to know your probed signal will work beforehand, for example by verifying with a scope first.
but as usual, the Internet Archive saved the day.
Consider donating if they helped you.
gadiyar•3mo ago
dougg3•2mo ago
I'm still a little puzzled about why the 2 second retry doesn't work. It might be worth diving in deeper to figure out why the data received during the retry never makes its way back to libusb. It's a bit of an edge case, but it seems like it could potentially be a bug. I might consider bringing that up as a question on the linux-usb list.