Mike Meeuwsen  wrote

> I've been working on an embedded 802.11 project, similar to some I've
> seen on this group, interfacing a PCMCIA card to a 16-bit micro. Its
> been going pretty well, and I am able to read and write to the card (A
> Linksys WPC11v3, based on PRISM 2/3 chipset).  I've successfully put the
> card in I/O mode, enabled the MAC port 0, and associated with my AP.  I
> have evidence of this in the AP log, as well as by checking the
> connection status in the card.
>
> However, when I attempt to transmit a packet on port zero (which should
> be enabled as per above): in this case, a prebuilt UDP packet to a
> broadcast MAC address, the card throws a TxExc error of Discon.  The
> documentation indicates that this means the port is not connected.  This
> doesn't make sense to me, since the card is still reporting a
> connection, and unless I've missed them, I haven't recived any info
> events saying I've diconnected.  I have noticed Rx events, but I haven't
> implemented the code to process the packets.
>
> One other thing I've noticed, in the AP log, there is periodicaly an
> entry for "association expiration" with the cards MAC addr.  This does
> not happen consistently.  I am attempting to transmit the packet almost
> directly after enabling the port (only a few status reads and packet
> construction in between).
>
> I'm out of ideas on this one.  Any advice would be appreciated.

I suspect you've missed out some of the initialisation steps, e.g. system
scale, basic rate, supported rates, etc... but I can't replicate chunks of
our PICmicro WLAN source code package here.

Also, if there are errors in your FID/RID handling (e.g. information vs.
configuration record handling), the PRISM won't necessarily generate an
error reponse, and may show its displeasure in strange ways.

Jeremy Bentham
Iosoft Ltd.
www.iosoft.co.uk