3 ms·
That's some fancy oscilloscope, but you can also get that info via usbmon, for example, directly to wireshark.
by megous 5y ago
That's some fancy oscilloscope, but you can also get that info via usbmon, for example, directly to wireshark.
- metaphor 5y agoIt's a DSO first and foremost which just happens to be equipped with a certain $809 option[1] supporting a very specific application. If you cared about digital decode only, and had confidence in both the SI of your interface and tooling, sure. Great when things "just work"...entirely unhelpful when they don't at the lower layers of hardware domain. [1] https://www.keysight.com/us/en/product/D4000USBA/usb-2-0-triggering-analysis-4000-x-series.html https://www.keysight.com/us/en/product/D4000USBA/usb-2-0-tri...
- megous 5y agoYes, but if you ask question "How does USB device discovery work?" (enumeration, I guess) you don't need any fancy equipment to answer that. It's nice and instructive to "see" the signals using a DSO, but not necessary.
- thristian 5y agoThis video is a follow-up to a mini-series that started with examining the PS/2 keyboard protocol. The oscilloscope is there because the audience is already familiar with it, not because it's the best tool for this particular job.
- megous 5y agoYes, I'm not criticizing the author, but it's good to know that you don't need fancy tools and you can get to see the enumeration too on your own devices, practically in similar amount of detail.