[lwip-users] lwIPv1.3.0 memory

[Bill Yang]

Hi,

 

I have three questions regarding the memory definitions in lwipopts.h based on lwIPv1.3.0. I wonder if some one can help me.

 

(1) In current memory options defined as below.

//#define MEM_LIBC_MALLOC                 0

#define MEM_ALIGNMENT                   4           // default is 1

#define MEM_SIZE                        (18 * 1024)  // default is 1600, was 16KIntDefaultHandler

//#define MEMP_OVERFLOW_CHECK             0

#define MEMP_SANITY_CHECK               1

//#define MEM_USE_POOLS                   0

//#define MEMP_USE_CUSTOM_POOLS           0

Q1: Can I reduce the MEM_SIZE TO (12 * 1024)? Is there any risk there?

 

(2)   If I defined MEM_USE_POOLS  1 and MEMP_USE_CUSTOM_POOLS  1,

Q2: Can I undifine the MEM_SIZE? Since MEM_SIZE disabled, where is the memory allocate for MEM_USE_POOLS and what is size for its using?

 

(3)   When I defined MEM_USE_POOLS  1 and MEMP_USE_CUSTOM_POOLS  1 and added lwippools.h, I tried to compile the system. But I got below compile errors.

#if MEM_USE_POOLS

/* Use a helper type to get the start and end of the user "memory pools" for mem_malloc */

typedef enum {

    /* Get the first (via:          

       MEMP_POOL_HELPER_START = ((u8_t) 1*MEMP_POOL_A + 0*MEMP_POOL_B + 0*MEMP_POOL_C + 0) */

    MEMP_POOL_HELPER_FIRST = ((u8_t)

#define LWIP_MEMPOOL(name,num,size,desc)

#define LWIP_MALLOC_MEMPOOL_START 1

#define LWIP_MALLOC_MEMPOOL(num, size) * MEMP_POOL_##size + 0

#define LWIP_MALLOC_MEMPOOL_END

#include "lwip/memp_std.h"

    ) ,  ..\Common\ethernet\lwip-1.3.0\src\include\lwip/memp.h(60): error:  #29: expected an _expression_

    /* Get the last (via:

       MEMP_POOL_HELPER_END = ((u8_t) 0 + MEMP_POOL_A*0 + MEMP_POOL_B*0 + MEMP_POOL_C*1) */

    MEMP_POOL_HELPER_LAST = ((u8_t)

#define LWIP_MEMPOOL(name,num,size,desc)

#define LWIP_MALLOC_MEMPOOL_START

#define LWIP_MALLOC_MEMPOOL(num, size) 0 + MEMP_POOL_##size *

#define LWIP_MALLOC_MEMPOOL_END 1

#include "lwip/memp_std.h"

    )   ..\Common\ethernet\lwip-1.3.0\src\include\lwip/memp.h(69): error:  #29: expected an _expression_

} memp_pool_helper_t;

Q3: What’s wrong with the code or how to fix these compile errors?

 

Thanks,

 

 

Bill Yang
Software Engineer

direct:    +1 801.433.6354
email:   address@hidden

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