Re: [Xenomai-help] using a pcmcia parallel port card

[Theo Veenker <Theo.Veenker@domain.hid>]

Gilles Chanteperdrix wrote:
> Theo Veenker wrote:
>> Hi,
>>
>> I'm trying to access a pcmcia parallel port (Trans Digital TDC303)
>> from a kernel space module. When I insert the card into the laptop
>> pcmcia_cs recognizes it and reports I/O address 0x3378. I tried
>> to access the device at that address like you would access LPT1
>> at 0x378. That didn't work; I assume the card is not actually at
>> that address or not enabled or something.
>>
>> Does anyone have a clue how to use a pcmcia parallel port card
>> with xenomai (or any other pcmcia card for that matter)?
> 
> I would think your problem is not the pcmcia card (after all, nowadays,
> a pcmcia driver is probably just a special kind of pci driver), your
> problem is likely that you try to access this PCMCIA parallel port as if
> it was the classical builtin ISA based parallel port, and it is not.
> Does linux use the same driver for this parallel port as for the vanilla
> parallel port ?
> 

Thanks. So modern PC cards are not ISA like?

I believe the vanilla port requires parport or parport_pc (a guess, I
never used this) and the particular pcmcia card I have is handled by
parport_cs (also handles the similar Quatech SPP-100).

Meanwhile I investigated a little further and found out by peeking at
the target I/O address (0x3378) and above/below, that the card is indeed
visible at that address. When card not inserted I see 0xFF, when inserted
I see data looking similar to what I see at 0x378. Maybe you are right
and the device cannot be accessed this way; in that case I hope someone
can hint me where to go. But first I'm going to try to find out if the
device isn't simply in the wrong mode (mode other than SPP). I'll let
you know.

Theo