- From: Stienen, A.H.A. (CTW) <"Stienen,>
- Date: Thu, 09 Mar 2006 12:52:03 +0100
Ian Abbott wrote:
> int configure_quad(comedi_t *dev,
> unsigned int subd,
> unsigned int encoding, /* GPCT_X1, GPCT_X2 or GPCT_X4 */
> unsigned int indexphase, /* GPCT_IndexPhaseHighHigh,
> GPCT_IndexPhaseLowHigh, GPCT_IndexPhaseLowLow or GPCT_IndexPhaseHighLow */
> unsigned int resetonindex /* 0 or GPCT_RESET_COUNTER_ON_INDEX */
> )
> {
> comedi_insn insn;
> lsampl_t data[4];
>
> memset(&insn, 0, sizeof insn);
> insn.insn = INSN_CONFIG;
> insn.subdev = subd;
> insn.data = data;
> insn.n = 4;
>
> data[0] = INSN_CONFIG_GPCT_QUADRATURE_ENCODER;
> data[1] = encoding;
> data[2] = indexphase;
> data[3] = resetonindex ? GPCT_RESET_COUNTER_ON_INDEX : 0;
>
> return comedi_do_insn(dev, &insn);
> }
Ian,
Why do you pick insn.n is 4? Isn't .n based on the number of sample
points you want to get back when inserting a data-read request? In the
original test programs of Klaas Gadeyne .n for the config insert was set
to 0. This turned out only to work when first a data-read or a
get-time-of-day was performed on the device, but when .n was set to 1,
it did work properly without the GTODs or data-reads. But other than
this, it seems to an irrelevant option for configuring.
Regards,
Arno.
--
____
/ |_| <<< IR. ARNO H.A. STIENEN >>>
|_ O | Biomechanical Engineering | http://www.bw.ctw.utwente.nl
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Received on 2006-03-09Z11:52:03