Definitions for ATmega640. More...
Include dependency graph for pgmspace.h:
Go to the source code of this file.
Macros | |
| #define | __need_size_t |
| #define | __ATTR_CONST__ __attribute__((__const__)) |
| #define | __ATTR_PROGMEM__ __attribute__((__progmem__)) |
| #define | __ATTR_PURE__ __attribute__((__pure__)) |
| #define | PROGMEM __ATTR_PROGMEM__ |
| Attribute to use in order to declare an object being located in flash ROM. | |
| #define | PSTR(s) (__extension__({static char __c[] PROGMEM = (s); &__c[0];})) |
| #define | __LPM_classic__(addr) |
| #define | __LPM_enhanced__(addr) |
| #define | __LPM_word_classic__(addr) |
| #define | __LPM_word_enhanced__(addr) |
| #define | __LPM_dword_classic__(addr) |
| #define | __LPM_dword_enhanced__(addr) |
| #define | __LPM_float_classic__(addr) |
| #define | __LPM_float_enhanced__(addr) |
| #define | __LPM(addr) __LPM_classic__(addr) |
| #define | __LPM_word(addr) __LPM_word_classic__(addr) |
| #define | __LPM_dword(addr) __LPM_dword_classic__(addr) |
| #define | __LPM_float(addr) __LPM_float_classic__(addr) |
| #define | pgm_read_byte_near(address_short) __LPM((uint16_t)(address_short)) |
| Read a byte from the program space with a 16-bit (near) address. More... | |
| #define | pgm_read_word_near(address_short) __LPM_word((uint16_t)(address_short)) |
| Read a word from the program space with a 16-bit (near) address. More... | |
| #define | pgm_read_dword_near(address_short) __LPM_dword((uint16_t)(address_short)) |
| Read a double word from the program space with a 16-bit (near) address. More... | |
| #define | pgm_read_float_near(address_short) __LPM_float((uint16_t)(address_short)) |
| Read a float from the program space with a 16-bit (near) address. More... | |
| #define | pgm_read_byte(address_short) pgm_read_byte_near(address_short) |
| Read a byte from the program space with a 16-bit (near) address. More... | |
| #define | pgm_read_word(address_short) pgm_read_word_near(address_short) |
| Read a word from the program space with a 16-bit (near) address. More... | |
| #define | pgm_read_dword(address_short) pgm_read_dword_near(address_short) |
| Read a double word from the program space with a 16-bit (near) address. More... | |
| #define | pgm_read_float(address_short) pgm_read_float_near(address_short) |
| Read a float from the program space with a 16-bit (near) address. More... | |
| #define | PGM_P const prog_char * |
| Used to declare a variable that is a pointer to a string in program space. More... | |
| #define | PGM_VOID_P const prog_void * |
| Used to declare a generic pointer to an object in program space. More... | |
Typedefs | |
| typedef void prog_void | PROGMEM |
Functions | |
| PGM_VOID_P | memchr_P (PGM_VOID_P, int __val, size_t __len) __ATTR_CONST__ |
| int | memcmp_P (const void *, PGM_VOID_P, size_t) __ATTR_PURE__ |
| void * | memccpy_P (void *, PGM_VOID_P, int __val, size_t) |
| void * | memcpy_P (void *, PGM_VOID_P, size_t) |
| void * | memmem_P (const void *, size_t, PGM_VOID_P, size_t) __ATTR_PURE__ |
| PGM_VOID_P | memrchr_P (PGM_VOID_P, int __val, size_t __len) __ATTR_CONST__ |
| char * | strcat_P (char *, PGM_P) |
| PGM_P | strchr_P (PGM_P, int __val) __ATTR_CONST__ |
| PGM_P | strchrnul_P (PGM_P, int __val) __ATTR_CONST__ |
| int | strcmp_P (const char *, PGM_P) __ATTR_PURE__ |
| char * | strcpy_P (char *, PGM_P) |
| int | strcasecmp_P (const char *, PGM_P) __ATTR_PURE__ |
| char * | strcasestr_P (const char *, PGM_P) __ATTR_PURE__ |
| size_t | strcspn_P (const char *__s, PGM_P __reject) __ATTR_PURE__ |
| size_t | strlcat_P (char *, PGM_P, size_t) |
| size_t | strlcpy_P (char *, PGM_P, size_t) |
| size_t | strlen_P (PGM_P) __ATTR_CONST__ |
| size_t | strnlen_P (PGM_P, size_t) __ATTR_CONST__ |
| int | strncmp_P (const char *, PGM_P, size_t) __ATTR_PURE__ |
| int | strncasecmp_P (const char *, PGM_P, size_t) __ATTR_PURE__ |
| char * | strncat_P (char *, PGM_P, size_t) |
| char * | strncpy_P (char *, PGM_P, size_t) |
| char * | strpbrk_P (const char *__s, PGM_P __accept) __ATTR_PURE__ |
| PGM_P | strrchr_P (PGM_P, int __val) __ATTR_CONST__ |
| char * | strsep_P (char **__sp, PGM_P __delim) |
| size_t | strspn_P (const char *__s, PGM_P __accept) __ATTR_PURE__ |
| char * | strstr_P (const char *, PGM_P) __ATTR_PURE__ |
| char * | strtok_P (char *__s, PGM_P __delim) |
| char * | strtok_rP (char *__s, PGM_P __delim, char **__last) |
Detailed Description
Definitions for ATmega640.
The functions in this module provide interfaces for a program to access data stored in program space (flash memory) of the device. In order to use these functions, the target device must support either the LPM or ELPM instructions.
- Note
- These functions are an attempt to provide some compatibility with header files that come with IAR C, to make porting applications between different compilers easier. This is not 100% compatibility though (GCC does not have full support for multiple address spaces yet).
- If you are working with strings which are completely based in ram, use the standard string functions described in avr_string.
-
If possible, put your constant tables in the lower 64 KB and use pgm_read_byte_near() or pgm_read_word_near() instead of pgm_read_byte_far() or pgm_read_word_far() since it is more efficient that way, and you can still use the upper 64K for executable code. All functions that are suffixed with a
_Prequire their arguments to be in the lower 64 KB of the flash ROM, as they do not use ELPM instructions. This is normally not a big concern as the linker setup arranges any program space constants declared using the macros from this header file so they are placed right after the interrupt vectors, and in front of any executable code. However, it can become a problem if there are too many of these constants, or for bootloaders on devices with more than 64 KB of ROM. All these functions will not work in that situation.
Contributors: Created by Marek Michalkiewicz marekm@linux.org.pl Eric B. Weddington eric@ecentral.com Wolfgang Haidinger wh@vmars.tuwien.ac.at (pgm_read_dword()) Ivanov Anton anton@arc.com.ru (pgm_read_float())
