[PATCH 0/3] RFC: fix bug http://docs.openmoko.org/trac/ticket/1884

Werner Almesberger werner at openmoko.org
Sun Nov 16 21:04:39 CET 2008

Andy Green wrote:
> 1V sounds evil,

That's my resistive x100 probe which has an impedance of only 5kOhm,
so it affects pull-ups. If I use a capacitative probe (and its long
leads), the signal just drowns in ambiental noise. 

> No, the reason I asked was because I wondered if too high a pullup
> resistance was allowing the interrupt to look asserted at the start of
> its slot depending on the data level when it stopped driving, it would
> need to be > 1us to make trouble I guess.

Hmm, that's a good idea. I think I'll have to sacrifice one of the
capacitative probes to give it really short leads ...

- Werner

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