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

[matt_hsu]

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.

    Matt
> Thanks for the pictures !
>
> - Werner
>