R: max DO speed

From: Daniele Verrocchio <daniele.verrocchio_at_diei.unipg.it> · Date: Mon, 5 Mar 2007 10:07:59 +0100

I must drive two PLL using the microwire interface. For pilot, I must send
forth signal clock, Load Enable, data PLL1, data PLL2 (format in 24 bit
packet). For respect the DUT velocity I must write this data at 2 Mb/s,
unfortunately I can't to go over 176 KHb/s whit user space application and
260 Kb/s whit kernel spaces application (RTAI).  

I can change my DAQ qhit another model, but which card garanted this
velocity whit comedi ? 

Thanks,
Daniele 

--
Ing. Daniele Verrocchio
Dipartimento di Ing. Elettronica e dell'Informazione
Università di Perugia
Via Duranti, 93 – 06125 Perugia - IT
Tel: 0755853648 - Cell: 3462348406

-----Messaggio originale-----
Da: Daniele Verrocchio [mailto:daniele.verrocchio_at_diei.unipg.it] 
Inviato: domenica 4 marzo 2007 16.20
A: 'comedi_at_comedi.org'
Oggetto: Re:max DO speed

Thanks for reply. 

Can I directly access to the DIO whit the outb() command using the subdevice
Physical address get whit the bash command lspci? 

The PCI 6259 use the 8255 register ?
Can I use the 8255 general driver ?

Thnaks,
Daniele Verrocchio 

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On Friday 02 March 2007 03:34 pm, Daniele Verrocchio wrote:
> Hi,
>
> this is my system configuration:
>
> - Pentium core dueo processor;
>
> - NI PCI =96 6250 DAQ ;
>
> - Linux ubuntu distribution version 6.06 lts, whit 2.6.15 kernel;
>
> - comedi and comedilib CVS version;
>
>
>
> I=92m write one simple application for program PLL whit microwire
> interface. The application work correctly but too slowing, because I
> can=92t to go over 176 KHz (whit clock like signal ) in user space and 260
> KHz in kernel space. The performance granted by the National Istrument
> are around 10 MHz.
>
> I have use the insn and insn list for sending write command.

The driver doesn't support waveform dio for m-series boards yet.  It is=20
actually on my to-do list though, since I will need it eventually myself. =
=20
It might not get done for some months though.  I don't know if it will do=20
10MHz, since in my experience NI's dma chip (mite) performs far worse than=
=20
they advertise.  It will probably do a couple MHz though.

=2D-=20
=46rank

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