Messages in this thread | | | Date | Tue, 15 Apr 2003 17:47:24 +0300 | From | Alexandru Damian <> | Subject | Re: paralel port - doesn't keep pins states |
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filip wrote:
>Hello, > >I hope it is the right place to ask about my problem... > >I want to use /dev/lp0 (lp module) on my PC for controlling >external devices. >The problem is when I wtire 1 byte to /dev/lp0, paralel port >keeps this state just for few ms... >(I made special plug - so the is no problem with handshake - details on: >http://www.hut.fi/Misc/Electronics/circuits/nullprint.html) > > It's normal, since the parallel -port specification clearly states that the port doesn't maintain the pins voltage more than a minimum mandatory delay, and while setting, the state is undefined.
>It is strange because everything works corect on my old PC (Pentium160). > That was broken hardware, it didn't meet the specifications :))
> >Regards, >Filip >- >To unsubscribe from this list: send the line "unsubscribe linux-kernel" in >the body of a message to majordomo@vger.kernel.org >More majordomo info at http://vger.kernel.org/majordomo-info.html >Please read the FAQ at http://www.tux.org/lkml/ > > > >
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