Not sure, but I think lwip should work fine on 16kByte RAM, assuming of
course that the code is located in and executed from a flash memory.
/Timmy Brolin
Michael Ambrus wrote:
Thank you all for replying.
Regarding the amount of RAM it varies. The system I'm considering has
targets of very different sizes. On some nodes there's "megabytes"
available, on others there's as little as 16K (or even less). I don't
mind altering between uIP and lwIP depending on which target, as long
as the code doesn't differ too much. I'm prepared to cope with the
limitations in cases lwIP can't be used because of it's larger
footprint, but would naturally prefer a better implementation where I
can.
If I understand you correctly Dmitry, there's a significant trade-off
between performance and RAM usage. Are the API's between uIP and lwIP
similar at least?
/Michael
On 4/2/07, Dmitry Potapov <[EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>> wrote:
Hello Michael,
> I'm new both to this list and lwIP/uIP. Both lwIP and uIP seem
to be
> adressing embedded TCP/IP and I'm confured about which one would
be best to
> use.
It depends on your goals. uIP can be used even on 8-bit
microcontrollers,
but it has a lot of limitations, and all work with the stack is
done through
callback mechanism with a single buffer, which is used for both
input and
output. So, if you transfer very little data, and all work with
them is simple
enough to be implemented by a single transaction state machine
then you
can use uIP. Thus, the primary use of uIP is configuration of a
device that
does not need TCP/IP for its normal work. On the other hand, if
your device
uses TCP/IP in the course of its normal operation, or if you want
socket
interface, or if you transfer considerable amount data over the
Internet then
I suggest you use lwIP.
Dmitry
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