Dennis Lee Bieber wrote:
> On Sat, 29 Jul 2006 13:59:02 +1000, Timothy Smith
> <[EMAIL PROTECTED]> declaimed the following in comp.lang.python:
>
>
>> and yes i've done quite a bit of googling, i never expected it to be
>> this difficult. i've done work with serial ports before. never parallel but.
>>
>
> Parallel gets ugly -- there are something like three different types
> of parallel port hardware, and they behave slightly differently (status
> bits, bidirectionality, etc.).
>
> http://www.amazon.com/gp/product/0965081915/qid=1154149492/sr=2-1/ref=pd_bbs_b_2_1/002-3804298-8662433?s=books&v=glance&n=283155
>
> is MS-DOS/Windows biased, but may give hints...
>
>
> (a few years ago I had to program a W98 laptop to write 6 data pins --
> representing three rs-422 style balanced signals -- in response to a
> 1KHz clock signal coming in on another pin... I had it working, but
> couldn't get rid of every last W98 OS interrupt, such that I had a 1-3
> clock length skip about every 700 clocks)
>
i think fcntl is what i'm after, although i've never done any system
level stuff like this before so it's a learning curve for me.
right now i'm attempting to use it like so and getting the following error.
>>> fd = open('/dev/ppi0','w')
>>> fcntl.ioctl(fd.fileno(),'PPISCTRL',10000000)
Traceback (most recent call last):
File "<stdin>", line 1, in ?
TypeError: an integer is required
i guess i'm failing to properly define the int i need for the 8byte
value ineed to send the port to set pins high /low
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