[lwip-users] Re: [lwip] Word mode transfers in an ethernet driver

[Dan Lewis]

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Nicolas,

Thanks for the offer. I intended to release my code when I'm done
anyway. So far, however, I've only tested ARP and DHCP - which seem to
work, and do so with word mode transfers in the driver.

My interest in lwIP is related to my book, "Fundamentals of Embedded
Software". It uses a library I wrote to let students develop small
embedded applications on a PC without using either the PC's BIOS or O.S.
 Their code is compiled using a small protected mode library I wrote and
includes support for uC/OS-II.

My current goal is to get all this running on a PC104 board sold by JK
MicroSystems, called the uFlashTCP. As the name implies, it includes the
RealTek Ethernet chip, and thus my interest in lwIP and writing the
driver.

Attached is the source I have so far for the RealTek chip. It isn't
very pretty yet - I still have a lot to do. In particular, I haven't
checked the routine that recovers from an input overrun in the RealTek
chip.

If you find anything that needs to be changed, please let me know.

All the best,

Dan Lewis, Chair
Computer Engineering
Santa Clara University

>>> address@hidden 11/28/02 2:49:45 PM >>>
I have written a driver for the RTL8019AS, it works ok but still has
some strange glitches. Maybe we can work together, and then release our
work ?

Nicolas

Quoting Dan Lewis <address@hidden>:

> I'm porting lwIP to a PC104 board that uses the RealTek RTL8019AS
> Ethernet controller. The board has the RealTek chip configured for
> word-mode transfers. The sample driver transfers data to/from the
> Ethernet controller by walking through the pbuf chain and then
(within
> each pbuf) transfers the pbuf contents to the Ethernet controller
one
> byte at a time. I'd like to transfer the data one 16-bit word at a
time.
> Does anyone know whether or not pbufs always contain an even number
of
> bytes (except possibly the last pbuf in the chain)?
> 
> Thanks in advance!
> 
> Dan Lewis, Chair
> Computer Engineering 
> Santa Clara University
> [This message was sent through the lwip discussion list.]
> 


-------------------------------------------------

[This message was sent through the lwip discussion list.]

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