Lpc2000

Hi David,

> Cool! If its no problem, could you post a summary of what you needed
> to do to get SLIP running between your LPC board and Windows XP.
> Did you need to add code to LwIP to support SLIP, or was
> it in there already?

uIP side tweaks:
1. Tweak slipdev_char_poll() and slipdev_char_put() for target
2. The next code line after while(1) in main.c has a typo, should be 
"uip_len = slipdev_poll();"
3. Implement Windows connect handshake "CLIENT"/"CLIENTSERVER" in
slipdev_poll()
4. Comment out the Ethernet header struct, as SLIP does not implement this.
5. Remove all references to ARP since you don't need this with SLIP.
6. In uipopt.h change #define UIP_LLH_LEN from 14 to 0.
7. Change IP address to suite your network.

There is basic info on porting the stack on the uIP website.

For XP connectivity I used this app note:
http://www.pumpkininc.com/content/doc/appnote/an-32.pdf


> I've been looking at the Linux side of things for PLIP and SLIP,
> and haven't played with the LPC-side yet. Here's my documentation
> on SLIP and PLIP from Linux
> 
> http://www.ovro.caltech.edu/~dwh/drivers.pdf

This will be useful for testing with Linux!

> I've downloaded the CVS LwIP and contrib directory, but haven't had
> a chance to read through it yet. Is there a good design document
> giving details on LwIPs implementation? Like I said, I haven't looked
> through the source in detail, so there might be something in there,
> but any comments would be appreciated.

I started on porting lwIP to IAR/ARM, but switched to uIP as it was much
quicker.  lwIP requires a bit more time to correctly port.  There is a
reasonably active lwIP mailing list.  AFAIK there is not an official mailing
list for uIP.

> As for PPP source, in Linux SLIP is a line discipline inside
> the tty layer, and so is PPP. If you can't find something that
> already bolts into LwIP, that might be a good place to look.

lwIP includes PPP support.  \lwip-1.1.0\src\netif\ppp
Ethernut's PPP implementation looks attractive from a size stand point.


Regards,
Joel