On 20/03/2015 17:56, Sylvain Rochet wrote:
They even do perfect documentation (perfect documentation is almost
always the case with Atmel) about lwIP[1], way better than our own lwIP
documentation, and which really prove they have a deep understanding of
lwIP internals.
We really should ask Atmel if we can re-use their documentation in order
to improve by several order of magnitude the quality of lwIP embedded
documentation.
Sylvain
[1]
http://www.atmel.com/Images/Atmel-42233-Using-the-lwIP-Network-Stack_AP-Note_AT04055.pdf
BTW, from that document (revision 03/2014, end of chapter 4.2.2 -
Receive buffers):
*"Beware that the amount of memory used by receive (pbuf) buffers is
constant and equals to GMAC_RX_BUFFERS ***
**PBUF_POOL_BUFSIZE. The lwIP total memory size MEM_SIZE must be set
accordingly.**"*
Please correct me if I'm wrong: PBUF_POOL buffers reside on a pool of
PBUF_POOL_SIZE. MEM_SIZE reserves space for PBUF_RAM buffers (and other
things?), not for PBUF_POOL buffers.
Side note: as correctly described earlier in that document, PBUF_POOL
buffers are only allocated by the network interface driver; so if LWIP
stack is working with one interface only, GMAC_RX_BUFFERS can be set
equal to PBUF_POOL_SIZE, provided that PBUF_POOL_BUFSIZE is equal to (or
greater than) the GMAC buffer size. Am I right?
Thanks
Enrico
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