[lwip-users] PBUFS + LWIP 1.3.0 + memory allocation

[Sirjee Rooplall]

Hi,

 

I am using lwip 1.3.0. I am new to LWIP, in the lwipopts file there is the follwoing definition of PBUFS.

I am using the AVR32 UC3 device, plus external SDRAM + PPP + ETHERNET.

 

/* ---------- Pbuf options ---------- */
/* PBUF_POOL_SIZE: the number of buffers in the pbuf pool. */

 

#define PBUF_POOL_SIZE                  10

 

/* PBUF_POOL_BUFSIZE: the size of each pbuf in the pbuf pool. */

 

#define PBUF_POOL_BUFSIZE               512

 

/* PBUF_LINK_HLEN: the number of bytes that should be allocated for a
   link level header. Defaults to 14 for Ethernet. */

 

#define PBUF_LINK_HLEN                  14

I have external SDRAM as heap memory, but it seems that these PBUFS are been allocated to onboard SRAM.

 

How can I change this to use the heap as all other memory allocations are done from the heap?

 

Where is the PBUF memory allocated?

 

In lwip 1.2.0 there was a pbuf_pool_mem, but I things have changed in lwip 1.3.0.

 

Can some please help me understand how the definition of the PBUF_POOL_SIZE and PBUF_POO_BUFSIZE is used in the memory allocation of pbufs.

 

I am using the sequential API's, i.e netconn_connect, netconn_write, netcon_recv, netconn_delete.

 

Kind Regards,

 

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