Diez B. Roggisch wrote:
>> >>> 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
>>
>
> Python doesn't know about PPISCTRL - it has no way of knowing all
> "secret", OS-specific constants for ioctl-calls.
>
> So, you need to figure out the numeric value of that constant .- look it
> up in the appropriate header-file.
>
> Then, you do have the next problem with passing that 10000000 value of
> yours. ioctl expects strings or buffers as parameters which contain a
> byte-representation of the value you want to set. This is an snippet I
> use to read the event device capabilities under linnux:
>
>
> buf = array.array('c', [' ' for i in xrange(EV_MAX / 8 + 1)])
> fcntl.ioctl(self._fd, EVIOCGBIT(0, len(buf)), buf, True)
> caps = struct.unpack("I", buf)[0]
>
> HTH,
>
> Diez
>
*sigh*
if only pyparallel would install
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