- From: L.C. Karssen <l.c.karssen_at_phys.uu.nl>
- Date: Fri, 25 May 2007 09:33:07 +0200
On Fri, 2007-05-25 at 01:11 +0200, Paolo Mantegazza wrote:
> Ciao,
>
> let's reset and see if I got something better, in the sense I likely
> understood a possible mistake of mine after asking to my dept comedi
> experts.
>
> So just try replacing the exsting comedi_dio_bitfield user space wrapper
> with the following:
>
>
>
> RTAI_PROTO(int, comedi_dio_bitfield,(void *dev, unsigned int subdev,
> unsigned int mask, unsigned int *bits))
> {
> int retval;
> unsigned int lbits = *bits;
> struct { void *dev; unsigned long subdev; unsigned long mask;
> unsigned int *bits; } arg = { dev, subdev, mask, &lbits };
> retval = rtai_lxrt(FUN_COMEDI_LXRT_INDX, COMEDI_LXRT_SIZARG,
> _KCOMEDI_DIO_BITFIELD, &arg).i[LOW];
> *bits = lbits;
> return retval;
> }
>
> Notice that the only change is the following:
> unsigned int lbits = *bits;
>
> Reports the result please!
Hi Paolo,
Of course! I should have seen that myself. Without the assignment no
bits were ever written (or probably only zeros). That's why calling
bitfield() in my initialisation worked: it sets all bits to zero.
I tested with this new wrapper in rtai_comedi.h and it works perfectly.
Thanks,
Lennart.
>
>
> Paolo.
--
*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
L.C. Karssen
Department of Physics and Astronomy
Faculty of Science
Utrecht University
Princetonplein 1
3584 CC Utrecht
The Netherlands
tel.: +31 (0)30-253-2208
fax.: +31 (0)30-253-7468
e-mail: L.C.Karssen_at_phys.uu.nl
www: http://www1.phys.uu.nl/wwwaoud
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Received on 2007-05-25Z06:33:07