[visionegg] Re: parallel port 2nd

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
> >>
> >> ======================================
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> >> 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

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