Dear Sir,
Thanks a lot for your suggestion, I'm trying for MPC by taking "
*Coldfire FEC example for lwIP*" has reference......
Regards
Thiru N
On Wed, Nov 14, 2012 at 6:01 PM, David Brown <[email protected]> wrote:
> On 14/11/2012 11:22, Thirumalesha N wrote:
>
>> Dear All,
>>
>> I'm new to lwip TCP/IP stack, I'm trying to implement udp
>> protocol for MPC5566 Microcontroller based controller card, I want
>> exhibit communication between controller card and PC(Running GUI based
>> application (UDP protocol implemented)).
>>
>> I'm trying to develop TCP(UDP)/IP protocol for controller..how
>> do I proceed...?
>>
>> Regards
>> Thiru N
>>
>>
> I've got lwIP working on another microcontroller of that family. I am not
> at liberty to publish any of the low-level code for the driver, but I can
> give you some hints. (One day it would be nice to re-write the code so
> that it could be published, but it is not easy to find the time for such
> work.)
>
> The driver itself was heavily inspired by the Coldfire FEC example for
> lwIP. The MPC's FEC has a lot of functionality - it can do things like
> scatter-gather DMA so that you can have the IP header and the packet
> contents in different buffers in memory, or send out the different parts of
> a lwIP pbuf chain without doing any copying and concatenation in the
> program. However, it is also possible to ignore this - my driver code does
> the concatenation and copying so that the FEC code is as simple as
> possible. It is less efficient, but a lot easier to get working.
>
> One thing to watch out for is that the FEC has it's own DMA engine that
> does not snoop the processor's cache (unlike the normal eDMA engine on the
> chip). That means you have to make sure caches are flushed around accesses
> to ram that the FEC accesses, or make sure that those memory areas are
> non-cached.
>
> Hope that helps!
>
> David
>
>
>
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