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: [email protected]<mailto:by...@[email protected]>
Parvus
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USA - 3222 S. Washington St. | Salt Lake City, Utah 84115 | Tel. +1
801.483.1533 | Fax +1 801.483.1523 |
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