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Rockbox mail archiveSubject: RE: stupid questionRE: stupid question
From: Nielsen Linus (ext) <"Nielsen>
Date: Mon, 19 Aug 2002 14:15:48 +0200 > 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 |