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Rockbox mail archiveSubject: Re: stupid questionRe: stupid question
From: George Styles <george_at_ripnet.co.uk>
Date: Mon, 19 Aug 2002 13:26:58 +0100 Cool... can I ask the 'gurus' one more question please? is it current-overload protected? ie, if I go mad and connect the +3.3v to ground by accident, am I gonna 'cook' the SH2? If its protected, I may get my soldiering iron out tonight... cheers g ----- Original Message ----- From: "Nielsen Linus (ext)" <Linus.Nielsen_at_elema.siemens.se> To: <rockbox_at_cool.haxx.se> Sent: Monday, August 19, 2002 1:15 PM Subject: RE: stupid question > > I am assuming that the serial line can be configured from > > software to be a simple digital input, which is bi-directional. > > Yes it is. > > > If this is the case, can we do the following: > > > > Usually have it set as an output, with 1 (+3.3v) on it. > > Connect a capacitor across it and ground, to store some 'juice' > > Use a simple push-to-make switch to ground it through a > > potential divider > > Each (say) 1/100s we could flip the digital line to an input, > > and read it. > > If its 0, the switch is down, if its 1, the switch is not down > > Bingo! we have an input, with just a couple of passive > > components, and no battary > > Sounds feasible, yes. > > > Can someone who has studied the schematics/ knows the SH2 > > processor tell me if this is possible? > > I can't see a reason why it shouldn't work. > > /Linus > Received on 2002-08-19 Page template was last modified "Tue Sep 7 00:00:02 2021" The Rockbox Crew -- Privacy Policy |