USB Analyzer [DSO Quad Application Software Design Entry]

End-Of-Life Products & Services DSO
#1

This is an USB Protocol Analyzer for the DSO Quad Application design competition:















See here for more details:

http://essentialscrap.com/dsoquad/usb.html



Downloads here (it needs QuadPawn 0.06 or newer):

http://koti.kapsi.fi/~jpa/dsoquad/#USB%20Analyzer

#2

Amazing work! I Cant wait until I use it as hardware keyboard sniffer :slight_smile: And is it really necessary to measure both D+/D- wires? The are forming a differential pair and most of the time they hold the same logic level on both lines.

#3

It would be quite easy to hack it to only show the contents of DATA packets… that would make an excellent keyboard sniffer :slight_smile:



End of packet is signalled in USB by pulling both D+ and D- to ground. I’m not sure if it is possible to detect it otherwise. Other than that, a single signal would be enough.

#4

Very nice addition. Thank you.

#5

I established the PAWN_006 version. USB Analyzer works normally, but with this version Frequency Response doesn’t work (FREQ001, doesn’t work at other modes absolutely). Frequency Response perfectly works with PAWN_002 (FREQ000), but USB Analyzer and many other things doesn’t work.

#6

Ok, I can see that there is a problem. For me it just stops midway through the measurement. I’ll debug that problem.



Can you tell what are the exact settings you use for testing? The results you get look a lot like the input probe (channel A) was just disconnected.

#7

minfreq = 2

maxfreq = 3

waveform = 0

clear = 1

steps = 3

reference = 0



PAWN_002 with these parameters works. PAWN_006 with these parameters hangs (even scanning doesn’t begin). On PAWN_006 it was possible though any result to receive for save only at maxfreq - 20k. Change only PAWN. All the rest without changes.

#8

This bug should be now fixed in PAWN_007. Available from

http://koti.kapsi.fi/jpa/dsoquad/#QuadPawn



The bug was caused by the new GCC version (4.7.3 vs. old 4.6.1) optimizing things differently. This caused a few bugs in the time-critical wavein loop to come visible.



There is also a new version of freqresp. But it is only a small speedup, not related to this bug:

<LINK_TEXT text=“https://github.com/PetteriAimonen/QuadP … eqresp.amx”>https://github.com/PetteriAimonen/QuadPawn/raw/master/Programs/freqresp.amx</LINK_TEXT>

#9

jpa, you do such lot of work, huge to you thanks.



Freqresp earned with the new PAWN version. Wasn’t started only scanning with minfreq - 10Hz, maxfreq - 20MHz . But with the new freqresp version everything fell into place, everything earned of full.



And here new LOGICAPP versions don’t work for me. I have works only the version of March, 2012, in size 66,3 kb. I have very old HW (v 2.6).



Excuse me for my English and off topic.