the root cause of flip-flop charging logic if you insert wall charger

matt_hsu matt_hsu at
Thu Sep 18 08:38:16 CEST 2008

Werner Almesberger wrote:
> matt_hsu wrote:
>> Do you think this elevator-style-signal is caused by system?
> Hmm, 700ms would be amazingly long for contact bounce.
> Oh, but what insertion is this ? 
    Wall charger
> Wall charger into USB port or wall
> charger into mains ? Both cases are relevant and probably look very
    They are same behaviors(insert wall charger) but which generated 
different contact bounce.
> different.
    USB port looks fine. I've tried it. Its contact bounce look perfect.

> Thanks for the pictures !
> - Werner

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