Re: [lwip-users] Compilation error encountered when using memory pool (MEM USE POOLS=1)

[address@hidden]

Hi York,

Please stay on the list next time.

Am 01.07.2020 um 14:55 schrieb yanhc519:
> Thanks Simon. Your suggestion solved my issue.
> However, I am wondering where defines the MEMP_POOL_256 macro. I tried
> and cannot find the definition.
> Could you give me a hint?

Call it "preprocessor magic". The parts in memp.h and memp_priv.h with
"MEMP_POOL_##size" (and similar) give you the required defines.

Regards,
Simon

>
> Thanks again,
> York
>
> On 7/1/2020 20:23，goldsimon@gmx.de<goldsimon@gmx.de>
> <mailto:goldsimon@gmx.de> wrote：
>
>     Am 01.07.2020 um 12:34 schrieb yanhc519 via lwip-users:
>
>         Hi all,
>
>         I want to use the memory pool in lwip. I define the following
>         macros to
>         1 to enable memory pool.
>         #define MEM_USE_POOLS1
>         #define MEMP_USE_CUSTOM_POOLS1
>         Also, I add a lwippool.h file to my project and define the
>         following:
>
>
>     You probably mean "lwippools.h" (note the s)?
>
>         #ifndef __LWIPPOOLS_H__
>         #define __LWIPPOOLS_H__
>
>
>     This file is special in that it is included multiple times with the
>     defines set to work differently each time. So you need to leave out the
>     include guard.
>
>     Regards,
>     Simon
>
>
>         LWIP_MALLOC_MEMPOOL_START
>         LWIP_MALLOC_MEMPOOL(20, 256)
>         LWIP_MALLOC_MEMPOOL_END
>
>         #endif /* __LWIPPOOLS_H__ */
>
>         However, when I compiled the project in MDK, an error encountered as
>         following:
>         
> ..\..\..\..\Utilities\Third_Party\lwip-2.1.0\src\include\lwip/priv/memp_priv.h(89):
>         error:  #29: expected an expression.
>
>         memp_priv.h(89) is as following:
>         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/priv/memp_std.h"
>             ) ,
>
>         After preprocessing, the enumeration will be look like as this:
>         typedef enum {
>             MEMP_POOL_HELPER_FIRST = ((u8_t)
>         1
>          * MEMP_POOL_256 + 0
>             ) ,
>
>         Since there is no definition of MEMP_POOL_256, so the compiler
>         reports
>         an error. 
>
>         Am I right? Is there anything I missing? How can I solve the issue?
>
>         Thanks,
>
>         York
>
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