USB not working - no effect on pc

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guest
 
Posts: 3155
Joined: Fri Feb 17, 2006 5:35 am

Re: USB not working - no effect on pc

Post by guest »

the usb should be recognized in any mode
regardless of whether the micro is in or not

the data lines should have sharp pulses on them
not sinewaves

how fast is your scope rated for

nogginj
 
Posts: 39
Joined: Sun Jul 08, 2007 11:37 pm

Re: USB not working - no effect on pc

Post by nogginj »

looks like it goes down to 10 ns. there are also too buttons i can push to go x10.

it's a tektronix 7704 a, i'll google the manual see what i can find.

what voltage will these spikes be at, and about what time setting should I be trying?

guest
 
Posts: 3155
Joined: Fri Feb 17, 2006 5:35 am

Re: USB not working - no effect on pc

Post by guest »

if it goes down to 10ns
thats plenty fast to measure 6MHz

you should see a clean sinewave at 6MHz
about 1v or so peak to peak

the data should be 5v pulses
probably at a lower speed like 1MHz
but im not positive on that
and if its not a digital storage scope
you might not catch them

nogginj
 
Posts: 39
Joined: Sun Jul 08, 2007 11:37 pm

Re: USB not working - no effect on pc

Post by nogginj »

well then perhaps my xtl2 is the culprit...i'll check my xtl1 later and see how it looks for reference. i definitely was not getting a 1v sine wave, i was getting mainly dc offset + a very very fast very very subtle sinewave.

Chris72160
 
Posts: 44
Joined: Wed May 01, 2013 6:24 am

Re: USB not working - no effect on pc

Post by Chris72160 »

Hello,

did you solve this problem, and how?

Greetz Chris

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