[lwip-users] PBUFS + MEMP + LWIP 1.3.0

[Sirjee Rooplall]

In LWIP 1.3.0 MEMP memory uses static memory, I have external SDRAM and wish for MEMP to allocate memory in the external memory which is managed by the the heap.

 

I am using the UC3A device, external SDRAM, heap is in external SDRAM. I use the heap_3.c file in my project.

 

How do I get MEMP to use this memory for its memory pools, I cannot see how this can be done in the current implementation of memp.

 

I found a website which talks about lwipopts, and one of the options, it talks about to force memp and mem to use the standard library malloc for all its memory allocation is:

 

#define MEMP_MEM_MALLOC 1

#define MEM_LIBC_MALLOC 1

 

seen in website:

http://lwip.wikia.com/wiki/Lwipopts.h#Memory_management_.28RAM_usage.29

 

However I cannot see where these difnes will be used in LWIP port 1.3.0.

 

Please can someone help understand this better and tell me how I can make LWIP use malloc from the standard C implementation, so that I can free up some of my static memory. I can get MEM to use libc malloc, by second definition above, but I cannot get memp to do the same.

 

Please help, Thanks in advance.

 

 

Kind Regards,

 

Sirjee Rooplall
Figment Design laboratories (Pty) Ltd
mailto: address@hidden
Mobile: +27 (0)83 230 8466