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: //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 > > > > > > ====================================== > > > The Vision Egg mailing list > > > Archives: //www.freelists.org/archives/visionegg > > > Website: http://www.visionegg.org/mailinglist.html > > > > > > > ====================================== > > The Vision Egg mailing list > > Archives: //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 > > ====================================== > The Vision Egg mailing list > Archives: //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 ====================================== The Vision Egg mailing list Archives: //www.freelists.org/archives/visionegg Website: http://www.visionegg.org/mailinglist.html