[visionegg] Re: parallel port 2nd

also giving +5V: no change. the daqlpt example shows gratings independet
of what is on the lpt pin 12.

please help! :)
thanks 
c
On Mon, 2003-02-03 at 11:09, Christoph Lehmann wrote:
> yes, even grounding it, yields in no change!
> christoph
> On Sat, 2003-02-01 at 04:19, Andrew Straw wrote:
> > Have you tried grounding the pin (not just letting it float)?  That may 
> > do the trick. I would try alternately grounding it and then giving it 
> > +5V and see if you can get the output to change.
> > 
> > Cheers!
> > Andrew
> > 
> > On Saturday, February 1, 2003, at 01:39  AM, Christoph Lehmann wrote:
> > 
> > > Hi Andrew
> > >
> > > I have some problems, which gets me crazy.....
> > >
> > > with the code:
> > >
> > >
> > > input_value = 0
> > > while (input_value == 0):
> > >        my_debug_msg.append('before<' + str(input_value) + '>lastimage 
> > > <'
> > > + str(last_image) + '>')
> > >        input_value = raw_lpt_module.inp(0x379) & 0x20 #I use pin 12
> > >        my_debug_msg.append('after<' + str(input_value) + '>lastimage <'
> > > + str(last_image) + '>')
> > >
> > > and nothing(!) on the LPT (open port) gives me (cycling trough the 
> > > whole
> > > two times):
> > >
> > > before<0>lastimage <0>
> > > after<32>lastimage <0>
> > > before<0>lastimage <1>
> > > after<32>lastimage <1>
> > >
> > > -> it seems that there is a logical 1 on the pin 12! why?
> > >
> > > thank you very much, Andrew, for a hint
> > >
> > > cheers
> > > christoph
> > >
> > >
> > > On Tue, 2002-12-17 at 18:07, Andrew Straw wrote:
> > >> Hi Christoph,
> > >>
> > >> Your two questions about the parallel port are essentially the same.
> > >> "inp()" returns a byte (well, actually it's a Python int, but it will
> > >> always be 0-255).  When you've pointed it to the parallel port like
> > >> "inp(0x379)", 8 bits of the parallel port get stored in the return
> > >> value.  This happens according to the standard method for encoding
> > >> multi-pin digital signals.  In Python, this would be (obviously the
> > >> system drivers don't run Python...)
> > >>
> > >> result = 0
> > >> for n in range(8):
> > >>      result += bit[n]*(2**n)
> > >>
> > >> therefore to get bit[n], you want to do something like
> > >>
> > >> for n in range(8):
> > >>      bit[n] = result & 2**n
> > >>
> > >> So, if all you care about in your code is bit 4, you can just do bit4 
> > >> =
> > >> result & 0x10.  So, modify your code from
> > >>>             input_value = raw_lpt_module.inp(0x379)
> > >>
> > >> to
> > >>      input_value = raw_lpt_module.inp(0x379) & 0x10
> > >>
> > >> ======================================
> > >> The Vision Egg mailing list
> > >> Archives: http://www.freelists.org/archives/visionegg
> > >> Website: http://www.visionegg.org/mailinglist.html
> > > -- 
> > > Christoph Lehmann
> > > Department of Psychiatric Neurophysiology
> > > University Hospital of Clinical Psychiatry
> > > Waldau
> > > CH-3000 Bern 60
> > > Switzerland
> > >
> > > Phone:  ++41 31 930 93 83
> > > Mobile: ++41 31 570 28 00
> > > Fax:    ++41 31 930 99 61
> > > Email:  lehmann@xxxxxxxxxxxx
> > > Web:    http://www.puk.unibe.ch/cl/pn_ni_cv_cl.html
> > >
> > > ======================================
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> > > Archives: http://www.freelists.org/archives/visionegg
> > > Website: http://www.visionegg.org/mailinglist.html
> > >
> > 
> > ======================================
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> -- 
> Christoph Lehmann 
> Department of Psychiatric Neurophysiology 
> University Hospital of Clinical Psychiatry 
> Waldau 
> CH-3000 Bern 60 
> Switzerland 
> 
> Phone:  ++41 31 930 93 83 
> Mobile: ++41 31 570 28 00
> Fax:    ++41 31 930 99 61 
> Email:  lehmann@xxxxxxxxxxxx 
> Web:    http://www.puk.unibe.ch/cl/pn_ni_cv_cl.html
> 
> ======================================
> The Vision Egg mailing list
> Archives: http://www.freelists.org/archives/visionegg
> Website: http://www.visionegg.org/mailinglist.html
-- 
Christoph Lehmann 
Department of Psychiatric Neurophysiology 
University Hospital of Clinical Psychiatry 
Waldau 
CH-3000 Bern 60 
Switzerland 

Phone:  ++41 31 930 93 83 
Mobile: ++41 31 570 28 00
Fax:    ++41 31 930 99 61 
Email:  lehmann@xxxxxxxxxxxx 
Web:    http://www.puk.unibe.ch/cl/pn_ni_cv_cl.html

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