Re: [lwip-users] Lwip on external ram

[Noam Weissman]

Hi Milan,

What about the following definitions (taken from my own lwipopts):
#define MEMP_NUM_PBUF           100
#define MEMP_NUM_TCP_SEG        TCP_SND_QUEUELEN

I am using RAW API and Socket API so I am not sure if the above is a must if 
you do not use RAW API.
The above are defined in opts.h but the default are much smaller. If 
MEMP_NUM_PBUF is left as
default (16) you may see some slowness ...


If you need lots of RAM why not sent LwIP to 128K or even more... you have 
sufficient RAM to use.
If you use the ST parallel SRAM interface it should be translucent for you. 

Porting LwIP from 1.41 to 2.0x is not too complicated. The arch interface has 
been somewhat changed.
Instead of using timers.h/c it has been changed to timeouts.h/c
Instead of struct ip_addr RemoteAddr;   you use now ip4_addr_t RemoteAddr;

There is a nice migration document and probably some examples by ST out there...

BR,
Noam.


-----Original Message-----
From: lwip-users [mailto:address@hidden On Behalf Of vatmi
Sent: Monday, August 14, 2017 12:01 PM
To: address@hidden
Subject: Re: [lwip-users] Lwip on external ram

Hello Noam,

Thank you very much for your suggestions. For me, the scenario was a bit 
different. All the sample applications and even one external applications are 
working lie a charm with LwiP 1.4.1, so I considered testing also the
open62541 stack with the same version. 

Speaking specifically on open 62541 requirement, the standard protocol 
describes the SEND_BUFFER and RECV_BUFFER  as 64K with TCP. Accordingly I made 
the following memory settings in Lwipopt file

#define MEM_SIZE                (50*1024)
#define MEMP_NUM_TCP_PCB        20
#define MEMP_NUM_TCP_PCB_LISTEN 15
#define PBUF_POOL_SIZE          20
#define PBUF_POOL_BUFSIZE       500
#define TCP_MSS                 (1500 - 40)       

#define TCP_SND_BUF             (7*TCP_MSS)

#define TCP_SND_QUEUELEN        (6* TCP_SND_BUF/TCP_MSS)

#define TCP_WND                 (4*TCP_MSS)

#define LWIP_SO_RCVBUF                          1

#define RECV_BUFSIZE_DEFAULT            (7*TCP_MSS)

#define TCPIP_THREAD_STACKSIZE          2500
#define TCPIP_MBOX_SIZE                 5
#define DEFAULT_TCP_RECVMBOX_SIZE       2000

All other applications are working fine with this settings. With respect to 
open62541, it set up a lot of memory while establishes connection with a 
Server. This was the reason why I was concerned with memory. Could you please 
check if I am making any mistake with Lwipopt file?

And thanks for suggestions for upgrading to Lwip 2.0.2. I hope I might have to 
redefine the ethernet also interfaces for this. Does it require too much effort?

BR
Milan  




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