All defines related to this section must not be placed in lwipopts.h, but in arch/cc.h! If the compiler does not provide memset() this file must include a definition of it, or include a file which defines it. More...
Macros | |
| #define | BYTE_ORDER LITTLE_ENDIAN |
| Define the byte order of the system. More... | |
| #define | LWIP_PLATFORM_DIAG(x) do {printf x;} while(0) |
| Define random number generator function of your system. More... | |
| #define | LWIP_PLATFORM_ASSERT(x) |
| Platform specific assertion handling. More... | |
| #define | LWIP_NO_STDDEF_H 0 |
| Define this to 1 in arch/cc.h of your port if you do not want to include stddef.h header to get size_t. More... | |
| #define | LWIP_NO_STDINT_H 0 |
| Define this to 1 in arch/cc.h of your port if your compiler does not provide the stdint.h header. More... | |
| #define | LWIP_NO_INTTYPES_H 0 |
| Define this to 1 in arch/cc.h of your port if your compiler does not provide the inttypes.h header. More... | |
| #define | LWIP_NO_LIMITS_H 0 |
| Define this to 1 in arch/cc.h of your port if your compiler does not provide the limits.h header. More... | |
| #define | LWIP_NO_CTYPE_H 0 |
| Define this to 1 in arch/cc.h of your port if your compiler does not provide the ctype.h header. More... | |
| #define | LWIP_CONST_CAST(target_type, val) ((target_type)((ptrdiff_t)val)) |
| C++ const_cast<target_type>(val) equivalent to remove constness from a value (GCC -Wcast-qual) More... | |
| #define | LWIP_ALIGNMENT_CAST(target_type, val) LWIP_CONST_CAST(target_type, val) |
| Get rid of alignment cast warnings (GCC -Wcast-align) More... | |
| #define | LWIP_PTR_NUMERIC_CAST(target_type, val) LWIP_CONST_CAST(target_type, val) |
| Get rid of warnings related to pointer-to-numeric and vice-versa casts, e.g. More... | |
| #define | LWIP_PACKED_CAST(target_type, val) LWIP_CONST_CAST(target_type, val) |
| Avoid warnings/errors related to implicitly casting away packed attributes by doing a explicit cast. More... | |
| #define | LWIP_DECLARE_MEMORY_ALIGNED(variable_name, size) u8_t variable_name[LWIP_MEM_ALIGN_BUFFER(size)] |
| Allocates a memory buffer of specified size that is of sufficient size to align its start address using LWIP_MEM_ALIGN. More... | |
| #define | LWIP_MEM_ALIGN_SIZE(size) (((size) + MEM_ALIGNMENT - 1U) & ~(MEM_ALIGNMENT-1U)) |
| Calculate memory size for an aligned buffer - returns the next highest multiple of MEM_ALIGNMENT (e.g. More... | |
| #define | LWIP_MEM_ALIGN_BUFFER(size) (((size) + MEM_ALIGNMENT - 1U)) |
| Calculate safe memory size for an aligned buffer when using an unaligned type as storage. More... | |
| #define | LWIP_MEM_ALIGN(addr) ((void *)(((mem_ptr_t)(addr) + MEM_ALIGNMENT - 1) & ~(mem_ptr_t)(MEM_ALIGNMENT-1))) |
| Align a memory pointer to the alignment defined by MEM_ALIGNMENT so that ADDR % MEM_ALIGNMENT == 0. More... | |
| #define | PACK_STRUCT_BEGIN |
| Packed structs support. More... | |
| #define | PACK_STRUCT_END |
| Packed structs support. More... | |
| #define | PACK_STRUCT_STRUCT |
| Packed structs support. More... | |
| #define | PACK_STRUCT_FIELD(x) x |
| Packed structs support. More... | |
| #define | PACK_STRUCT_FLD_8(x) PACK_STRUCT_FIELD(x) |
| Packed structs support. More... | |
| #define | PACK_STRUCT_FLD_S(x) PACK_STRUCT_FIELD(x) |
| Packed structs support. More... | |
| #define | LWIP_UNUSED_ARG(x) (void)x |
| PACK_STRUCT_USE_INCLUDES==1: Packed structs support using #include files before and after struct to be packed. More... | |
All defines related to this section must not be placed in lwipopts.h, but in arch/cc.h! If the compiler does not provide memset() this file must include a definition of it, or include a file which defines it.
These options cannot be #defined in lwipopts.h since they are not options of lwIP itself, but options of the lwIP port to your system.
| #define BYTE_ORDER LITTLE_ENDIAN |
| #define LWIP_ALIGNMENT_CAST | ( | target_type, | |
| val | |||
| ) | LWIP_CONST_CAST(target_type, val) |
| #define LWIP_CONST_CAST | ( | target_type, | |
| val | |||
| ) | ((target_type)((ptrdiff_t)val)) |
| #define LWIP_DECLARE_MEMORY_ALIGNED | ( | variable_name, | |
| size | |||
| ) | u8_t variable_name[LWIP_MEM_ALIGN_BUFFER(size)] |
Allocates a memory buffer of specified size that is of sufficient size to align its start address using LWIP_MEM_ALIGN.
You can declare your own version here e.g. to enforce alignment without adding trailing padding bytes (see LWIP_MEM_ALIGN_BUFFER) or your own section placement requirements.
e.g. if you use gcc and need 32 bit alignment:
#define LWIP_DECLARE_MEMORY_ALIGNED(variable_name, size) u8_t variable_name[size] __attribute__((aligned(4)))
or more portable:
#define LWIP_DECLARE_MEMORY_ALIGNED(variable_name, size) u32_t variable_name[(size + sizeof(u32_t) - 1) / sizeof(u32_t)]
| #define LWIP_MEM_ALIGN | ( | addr | ) | ((void *)(((mem_ptr_t)(addr) + MEM_ALIGNMENT - 1) & ~(mem_ptr_t)(MEM_ALIGNMENT-1))) |
| #define LWIP_MEM_ALIGN_BUFFER | ( | size | ) | (((size) + MEM_ALIGNMENT - 1U)) |
| #define LWIP_MEM_ALIGN_SIZE | ( | size | ) | (((size) + MEM_ALIGNMENT - 1U) & ~(MEM_ALIGNMENT-1U)) |
Calculate memory size for an aligned buffer - returns the next highest multiple of MEM_ALIGNMENT (e.g.
LWIP_MEM_ALIGN_SIZE(3) and LWIP_MEM_ALIGN_SIZE(4) will both yield 4 for MEM_ALIGNMENT == 4).
| #define LWIP_NO_CTYPE_H 0 |
Define this to 1 in arch/cc.h of your port if your compiler does not provide the ctype.h header.
If ctype.h is available, a few character functions are mapped to the appropriate functions (lwip_islower, lwip_isdigit...), if not, a private implementation is provided.
| #define LWIP_NO_INTTYPES_H 0 |
Define this to 1 in arch/cc.h of your port if your compiler does not provide the inttypes.h header.
You need to define the format strings listed in lwip/arch.h yourself in this case (X8_F, U16_F...).
| #define LWIP_NO_LIMITS_H 0 |
| #define LWIP_NO_STDDEF_H 0 |
| #define LWIP_NO_STDINT_H 0 |
Define this to 1 in arch/cc.h of your port if your compiler does not provide the stdint.h header.
You need to typedef the generic types listed in lwip/arch.h yourself in this case (u8_t, u16_t...).
| #define LWIP_PACKED_CAST | ( | target_type, | |
| val | |||
| ) | LWIP_CONST_CAST(target_type, val) |
| #define LWIP_PLATFORM_ASSERT | ( | x | ) |
Platform specific assertion handling.
Note the default implementation pulls in printf, fflush and abort, which may in turn pull in a lot of standard libary code. In resource-constrained systems, this should be defined to something less resource-consuming.
| #define LWIP_PLATFORM_DIAG | ( | x | ) | do {printf x;} while(0) |
Define random number generator function of your system.
Platform specific diagnostic output.
Note the default implementation pulls in printf, which may in turn pull in a lot of standard libary code. In resource-constrained systems, this should be defined to something less resource-consuming.
| #define LWIP_PTR_NUMERIC_CAST | ( | target_type, | |
| val | |||
| ) | LWIP_CONST_CAST(target_type, val) |
| #define LWIP_UNUSED_ARG | ( | x | ) | (void)x |
PACK_STRUCT_USE_INCLUDES==1: Packed structs support using #include files before and after struct to be packed.
The file included BEFORE the struct is "arch/bpstruct.h".
The file included AFTER the struct is "arch/epstruct.h".
This can be used to implement struct packing on MS Visual C compilers, see the Win32 port in the lwIP contrib repository for reference. For examples of packed struct declarations, see include/lwip/prot/ subfolder.
A port to GCC/clang is included in lwIP, if you use these compilers there is nothing to do here.Eliminates compiler warning about unused arguments (GCC -Wextra -Wunused).
| #define PACK_STRUCT_BEGIN |
| #define PACK_STRUCT_END |
| #define PACK_STRUCT_FIELD | ( | x | ) | x |
| #define PACK_STRUCT_FLD_8 | ( | x | ) | PACK_STRUCT_FIELD(x) |
Packed structs support.
Wraps u8_t members, where some compilers warn that packing is not necessary.
For examples of packed struct declarations, see include/lwip/prot/ subfolder.
A port to GCC/clang is included in lwIP, if you use these compilers there is nothing to do here.
| #define PACK_STRUCT_FLD_S | ( | x | ) | PACK_STRUCT_FIELD(x) |
Packed structs support.
Wraps members that are packed structs themselves, where some compilers warn that packing is not necessary.
For examples of packed struct declarations, see include/lwip/prot/ subfolder.
A port to GCC/clang is included in lwIP, if you use these compilers there is nothing to do here.
| #define PACK_STRUCT_STRUCT |
Packed structs support.
Placed between end of declaration of a packed struct and trailing semicolon.
For examples of packed struct declarations, see include/lwip/prot/ subfolder.
A port to GCC/clang is included in lwIP, if you use these compilers there is nothing to do here.
