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ataradov / usb-sniffer-lite

A simple USB sniffer based on Raspberry Pi RP2040
BSD 3-Clause "New" or "Revised" License
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Pokken Tournament DX Controller Spewing Errors #7

Open zoggins opened 1 year ago

zoggins commented 1 year ago

So I am trying to sniff the communication between a Nintendo Switch and a Pokken Tournament DX controller and am just seeing it spew errors. The controller is working fine on the switch and I have sniffed other controllers hooked up to the switch with no problems, but I am stumped as to why this controller is having issues. I have attached a pretty typical capture of the controller. Any advice would be appreciated. teraterm.log

ataradov commented 1 year ago

This looks like either signal integrity issue or timing issue. I would guess timing, since short frames are captured fine and there are a lot of NBIT errors.

In cases like this it would be useful to look at the signal with an oscilloscope on both D+ and D-. Look at the overall shape of the waveforms and bit timing.

zoggins commented 1 year ago

I can hook an oscilloscope up and see what I can see. Thanks.

From: Alex Taradov @.> Sent: Saturday, October 21, 2023 18:52 To: ataradov/usb-sniffer-lite @.> Cc: Christopher Mallery @.>; Author @.> Subject: Re: [ataradov/usb-sniffer-lite] Pokken Tournament DX Controller Spewing Errors (Issue #7)

This looks like either signal integrity issue or timing issue. I would guess timing, since short frames are captured fine and there are a lot of NBIT errors.

In cases like this it would be useful to look at the signal with an oscilloscope on both D+ and D-. Look at the overall shape of the waveforms and bit timing.

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stappersg commented 3 months ago

I can hook an oscilloscope up and see what I can see.

What did you see?

Any other progress to report? Like: "With short cables it works fine, I'm suppecting voltage drop is causing the odd behaviour".

(How I got here: https://hackaday.com/2024/08/03/need-a-usb-sniffer-use-your-pico/ )