Are you sure this is a Parallel Device? Because it sounds like a Serial
Device and there are some DB-25 pin connectors that look like parallel, but
they are serial...
Please reply to the list as others can probably help you better than I.
Nate
----- Original Message -----
From: "Pawel Stochlinski" <int01h@sentinel.mj12.eu.org>
To: "Nate" <nate@uniwest.com>
Sent: Thursday, December 19, 2002 5:15 PM
Subject: Re: [PARPORT] Reading from pin - help.
> Of course, but the ds1820 sensor has 2 pins:
> GROUND and DATA (bi-direcional pin).
>
> GND is connected t 18'th pin on Paraller port
> the DATA pin of sensor is plugged to pin 11 (non negative right now -
> easier)
>
> All i have to do, is (how says the manual) - change voltage to LOW on
> datapin(pin 11'th) for 600mseconds and so on, and next i should read
> incoming bytes from datapin on sensor. And that is all, thats what i am
> asking for.
> If i'll write:
>
> write_LPT(0x00,STATUS); //write_LPT is an function for outb(byte,port);
>
> will that above, set the STATUS pins to low state ?
>
> That was my last question, i'm sorry, but i am in need also :(
>
>
> "Ulubiency bogow umieraja mlodo ale pozniej zyja wiecznie w ich
> towarzystwie" [Fryderyk Nietzsche]
>
____________________________________________________________________________
> __
> Pawel Stochlinski (int01h)
> Linux registered user: #246375
> (http://sentinel.mj12.eu.org||http://ipe.ath.cx)
> -----BEGIN PGP MESSAGE-----
> Version: GnuPG v1.0.7 (GNU/Linux)
>
> owGbwMvMwCS46Lmlj0renf2MawSTuPSKM9PzEktKi1JtmS894uqwZ2ZlALFgigSZ
> 1BoZ5gfNr/iXLPy+r3f/lXk7Zdqar1ebVDAsuOU9S+e8yUeby+tYdr/1PL2nliF+
> CgA=
> =lIWg
> -----END PGP MESSAGE-----
>
>
> ----- Original Message -----
> From: "Nate" <nate@uniwest.com>
> To: "Pawel Stochlinski" <int01h@sentinel.mj12.eu.org>
> Cc: <linux-parport@torque.net>
> Sent: Friday, December 20, 2002 2:05 AM
> Subject: Re: [PARPORT] Reading from pin - help.
>
>
> > How this works as I understand it is you need to read the nAck to know
> when
> > the data in the data register is valid.
> >
> > So you shouldn't just be reading one pin. The nAck can be set by the
> other
> > source to indicate that you can consider the data register to be valid.
> > This all depends on what cable you are using and how the device works.
> >
> > You are not going to be able to read X number of bytes just across one
> pin.
> > You must follow the design of the sensor, if it has one. Typically a
> source
> > will write data to the data register and then write to its own control
> > register to indicate that the data is valid and ready. Then the reading
> > computer will read its own status to see that the source wrote to the
> > source's own control register, so the data in the data area must be
good.
> > Then read the data and write back on its own control register that is it
> > done reading. Now the source reads the source's status and sees that
the
> > reading computer read it. It will keep going until its done.
> >
> > I hope that gives a picture and isn't too confusing. It depends greatly
> on
> > the wiring too, a LapLink cable is different than a Straight-Through
> > Parallel Cable.
> > So you will be reading and writing to at least three areas: DATA,
CONTROL
> > and STATUS.
> > Try reading some of the links I sent earlier too, for a better
> explanation,
> > than I can do.
> >
> >
> > Good luck.
> >
> > Nate
> >
> >
> >
> > ----- Original Message -----
> > From: "Pawel Stochlinski" <int01h@sentinel.mj12.eu.org>
> > To: "Nate" <nate@uniwest.com>
> > Sent: Thursday, December 19, 2002 4:53 PM
> > Subject: Re: [PARPORT] Reading from pin - help.
> >
> >
> > > Kewl, this is what i have done earlier, but how do i read a data from
> that
> > > port?
> > > The main question from me is :
> > > "How can i read a data flowing to pin 10 (nACK) ?"
> > >
> > > Big thnx.
> > >
> > > ----- Original Message -----
> > > From: "Nate" <nate@uniwest.com>
> > > To: "Pawel Stochlinski" <int01h@sentinel.mj12.eu.org>
> > > Cc: <linux-parport@torque.net>
> > > Sent: Friday, December 20, 2002 1:45 AM
> > > Subject: Re: [PARPORT] Reading from pin - help.
> > >
> > >
> > > > adding to what "Uwe Bonnes" stated earlier, plus a little more...
> > > >
> > > > ///////////////////////////////////////////////////////////////
> > > > // this assumes you have the appropriate parport modules loaded
> > > >
> > > > unsigned char ucStatus = 0;
> > > > int nFD = -1;
> > > > int nError = 0;
> > > >
> > > > nFD = open( "/dev/parport0", O_RDWR );
> > > > if( nFD>0 )
> > > > {
> > > > nError = ioctl(nFD, PPCLAIM, 0 );
> > > > if( !nError )
> > > > nError = ioctl(nFD, PPRSTATUS, &ucStatus );
> > > > if( !nError )
> > > > {
> > > > if( ucStatus & 0x40 ) // is the bit a 1?
> > > > printf( "nAck or S6 or Pin 10 is 1\n " );
> > > > else
> > > > printf( "nAck or S6 or Pin 10 is 0\n " );
> > > > }
> > > > close( nFD );
> > > > }
> > > >
> > > > ///////////////////////////////////////////////////////////////
> > > >
> > > >
> > > > Other good references
> > > >
> > > > http://www.doc.ic.ac.uk/~ih/doc/par
> > > > http://www.beyondlogic.org/spp/parallel.htm
> > > > http://www.lvr.com/files/pppinout.pdf
> > > >
> > > >
> > > > Nate
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > ----- Original Message -----
> > > > From: "Pawel Stochlinski" <int01h@sentinel.mj12.eu.org>
> > > > Cc: <linux-parport@torque.net>
> > > > Sent: Thursday, December 19, 2002 2:53 PM
> > > > Subject: Re: [PARPORT] Reading from pin - help.
> > > >
> > > >
> > > > > ----- Original Message -----
> > > > > From: "Uwe Bonnes" <bon@elektron.ikp.physik.tu-darmstadt.de>
> > > > > To: "Pawel Stochlinski" <int01h@sentinel.mj12.eu.org>
> > > > > Cc: <linux-parport@torque.net>
> > > > > Sent: Wednesday, December 18, 2002 10:14 PM
> > > > > Subject: Re: [PARPORT] Reading from pin - help.
> > > > >
> > > > >
> > > > > > >>>>> "Pawel" == Pawel Stochlinski <int01h@sentinel.mj12.eu.org>
> > > writes:
> > > > > >
> > > > > > Pawel> Please help me - i have a problem with reading a data
> > from
> > > > pin
> > > > > > Pawel> #10 on LPT (its an ACK), what should i write in code,
> to
> > > read
> > > > > it?
> > > > > > Pawel> I am using x=inb(STATUSPORT); but that is not
correct,
> > > > please,
> > > > > > Pawel> help me how to read from pin 10...
> > > > > >
> > > > > > Do something like
> > > > > >
> > > > > > int re;
> > > > > >
> > > > > > fd = open(portname,O_RDWR);
> > > > > >
> > > > > > ioctl(fd,PPRSTATUS,&res);
> > > > > >
> > > > > > Bye
> > > > > > --
> > > > > > Uwe Bonnes
bon@elektron.ikp.physik.tu-darmstadt.de
> > > > > >
> > > > > > Institut fuer Kernphysik Schlossgartenstrasse 9 64289
Darmstadt
> > > > > > --------- Tel. 06151 162516 -------- Fax. 06151
164321 ----------
> > > > > >
> > > > > > -- To unsubscribe, send mail to:
> > linux-parport-request@torque.net --
> > > > > > -- with the single word "unsubscribe" in the body of the
> > message. --
> > > > >
> > > > > Yep, but when i read from file descriptor the soft is 'blocked'
> > waiting
> > > > for
> > > > > data.
> > > > >
> > > > > Isnt there anything easier? I just want to read from some pin a
> data,
> > > > > not\hing more.
> > > > >
> > > > > Thanks
> > > > >
> > > > >
> > > > > -- To unsubscribe, send mail to:
> linux-parport-request@torque.net --
> > > > > -- with the single word "unsubscribe" in the body of the
> message. --
> > > > >
> > > > >
> > >
> > >
>
>
-- To unsubscribe, send mail to: linux-parport-request@torque.net --
-- with the single word "unsubscribe" in the body of the message. --
This archive was generated by hypermail 2b29 : Thu Dec 19 2002 - 20:23:34 EST