[lwip-users] LwIP binary is big...

[Eduardo Goncalves]

Hi

 

I have created a TCP echo server using LwIP raw API running on a STM32F767ZI.

This was based on the example provided by ST in:

en.stm32cubef7_v1-16-0\STM32Cube_FW_F7_V1.16.0\Projects\STM32756G_EVAL\Applications\LwIP\LwIP_TCP_Echo_Server

This example is for the STM32756G but I had it changed to fit the STM32F767ZI.

 

The program is working but the binary is about 55Kbytes, which I find it too large. I have also implemented a FreeRTOS-IP stack with FreeRTOS and I get 40 kbytes!

I’m not using any compiler optimizations because I want to use the debugger properly.

I am interested in using the raw API, so netconn and sockets are disable. I left ping enabled just for test purpose.

 

I just wonder if there is code that can be removed in order to shrink the stack. I guess a optimal size would be around the 40Kbytes.

 

These are my options in lwipopts.h:

 

#define NO_SYS                  1

#define SYS_LIGHTWEIGHT_PROT    0

#define MEM_ALIGNMENT           4

#define MEM_SIZE                (10*1024)

#define MEMP_NUM_PBUF           10

#define MEMP_NUM_UDP_PCB        6

#define MEMP_NUM_TCP_PCB        10

#define MEMP_NUM_TCP_PCB_LISTEN 5

#define MEMP_NUM_TCP_SEG        8

#define MEMP_NUM_SYS_TIMEOUT    10

#define PBUF_POOL_SIZE          8

#define PBUF_POOL_BUFSIZE       1524

#define LWIP_IPV4                1

#define LWIP_TCP                1

#define TCP_TTL                 255

#define TCP_QUEUE_OOSEQ         0

#define TCP_MSS                 (1500 - 40)      /* TCP_MSS = (Ethernet MTU - IP header size - TCP header size) */

#define TCP_SND_BUF             (4*TCP_MSS)

#define TCP_SND_QUEUELEN        (2* TCP_SND_BUF/TCP_MSS)

#define TCP_WND                 (2*TCP_MSS)

#define LWIP_ICMP                       1

#define LWIP_DHCP               0

#define LWIP_UDP                0

#define UDP_TTL                 255

#define LWIP_STATS 0

#define LWIP_NETIF_LINK_CALLBACK        0

#define CHECKSUM_BY_HARDWARE

#define LWIP_NETCONN                    0

#define LWIP_SOCKET                     0

Thanks,

 

Eduardo Goncalves
Control Systems & Digital Solutions
Semcon Norge AS
Dyrmyrgata 47
3611 KONGSBERG
Norway
E-mail		eduardo.goncalves@semcon.com
www.semcon.com
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