10
Analyzing USB (lemmy.world)
submitted 3 weeks ago* (last edited 3 weeks ago) by to c/ece@lemmy.world
13 comments fedilink hide all child comments
 

How do people use an oscilloscope to analyze USB packets and such? I saw a video by Ben Eater and the way he did it was by exposing the necessary wires of a USB cable and probing those. Is this standard or are there types out there that have this functionally built-in as some accessory or something?

Edit: logic analyzers are pretty interesting

you are viewing a single comment's thread
view the rest of the comments
[–] 3 points 3 weeks ago (5 children)

Was it a logic analyzer instead, like https://www.saleae.com/logic?

  • permalink
  • fedilink
  • source
  • hideshow 5 child comments
    •
  • [–] [S] 2 points 3 weeks ago* (4 children)

    Checked the video again. He used a Keysight DSOX1204G Digital Storage Oscilloscope.

    https://www.youtube.com/watch?v=wdgULBpRoXk

  • permalink
  • fedilink
  • source
  • parent
  • hideshow 4 child comments
    •
  • [–] 2 points 3 weeks ago (3 children)

    I have the same scope, but it doesn’t have USB decode. I watched the video and he’s initially doing the decoding very manually. Fun, but not something you’re going to want to do when someone’s paying for your time.

    He later switches to a Keysight DSO-X 4024A. It costs a fair bit more. :)

  • permalink
  • fedilink
  • source
  • parent
  • hideshow 3 child comments
    •
  • [–] [S] 2 points 3 weeks ago (2 children)

    Been doing some digging now knowing about logic analyzers and I found that RIGOL has some oscilloscopes with digital channels that are within my budget range (needs the RPL1116 probe to function). Though they're bandwidth is 100MHz for the one's I could find that are under 500-1,000$. Would this be enough at least for USB 2.0?

  • permalink
  • fedilink
  • source
  • parent
  • hideshow 2 child comments
    •
  • [–] 1 point 2 weeks ago (1 child)

    Does it have built-in USB decoding? If not then it’s not very practical tbh, but it could do low speed and full speed, with manual decoding. Not high speed.

    OpenVizsla can do high speed: https://shop.sysmocom.de/USB-Tracing/

    What are you after though? A scope is more fun. :)

  • permalink
  • fedilink
  • source
  • parent
  • hideshow 1 child comment
    •
  • [–] [S] 1 point 2 weeks ago*

    I'm trying to learn electrical circuit design and programming and want/need an oscilloscope for obvious reasons (I already have most of the basic stuff such as a soldering station and a multimeter). I know I want to work with various ICs, FPGAs, and of course stuff like USB to plug stuff. Though budget isn't that extravagant, I should have decent wiggle room (I suppose totals of below or around 700$ is fairly manageable at the moment).

  • permalink
  • fedilink
  • source
  • parent