ReAl (04.10.2010 15:49, просмотров: 252) ответил bialix на avr-gcc+mega128: как заставить компилятор использовать 32-бита для указателей? По умолчанию указатели 16-битные, что не позволяет обратиться к строке в старших адресах флеши.Если нужен полный набор функций — искать на avrfreaks по слову morepgmspace.h /* Copyright (c) 2006, Carlos Lamas
All rights reserved.
Source to be appended to <avr/pgmspace.h> someday?
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* Redistributions of source code must retain the above copyright
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE. */
#ifndef MOREPGMSPACE_H
#define MOREPGMSPACE_H 1
#define __need_size_t
#include <stddef.h>
#include <inttypes.h>
#include <avr/pgmspace.h>
#ifndef __ATTR_CONST__
#define __ATTR_CONST__ __attribute__((__const__))
#endif
#ifndef __ATTR_PROGMEM__
#define __ATTR_PROGMEM__ __attribute__((__progmem__))
#endif
#ifndef __ATTR_PURE__
#define __ATTR_PURE__ __attribute__((__pure__))
#endif
/* GET_FAR_ADDRESS() macro
This macro facilitates the obtention of a 32 bit "far" pointer (only 24 bits
used) to data even passed the 64KB limit for the 16 bit ordinary pointer. It
is similar to the '&' operator, with some limitations.
Comments:
- The overhead is minimal and it's mainly due to the 32 bit size operation.
- 24 bit sizes guarantees the code compatibility for use in future devices.
- hh8() is an undocumented feature but seems to give the third significant byte
of a 32 bit data and accepts symbols, complementing the functionality of hi8()
and lo8(). There is not an equivalent assembler function to get the high
significant byte.
- 'var' has to be resolved at linking time as an existing symbol, i.e, a simple
type variable name, an array name (not an indexed element of the array, if the
index is a constant the compiler does not complain but fails to get the address
if optimization is enabled), a struct name or a struct field name, a function
identifier, a linker defined identifier,...
- The natural place for this macro should be the header avr/pgmspace.h and the
name... pgm_get_far_address?
- The returned value is the identifier's VMA (virtual memory address) determined
by the linker and falls in the corresponding memory region. The AVR Harvard
architecture requires non overlapping VMA areas for the multiple address spaces
in the processor: Flash ROM, RAM, and EEPROM. Typical offset for this are
0x00000000, 0x00800xx0, and 0x00810000 respectively, derived from the linker
script used and linker options. The value returned can be seen then as a
universal pointer.
*/
#define GET_FAR_ADDRESS(var) \
({ \
uint_farptr_t tmp; \
\
__asm__ __volatile__( \
\
"ldi %A0, lo8(%1)" "\n\t" \
"ldi %B0, hi8(%1)" "\n\t" \
"ldi %C0, hh8(%1)" "\n\t" \
"clr %D0" "\n\t" \
: \
"=d" (tmp) \
: \
"p" (&(var)) \
); \
tmp; \
})
#ifdef __cplusplus
extern "C" {
#endif
extern size_t strlen_PF (uint_farptr_t src) __ATTR_CONST__; /* program memory can't change */
extern size_t strnlen_PF (uint_farptr_t src, size_t len) __ATTR_CONST__; /* program memory can't change */
extern void *memcpy_PF (void *dest, uint_farptr_t src, size_t len);
extern char *strcpy_PF (char *dest, uint_farptr_t src);
extern char *strncpy_PF (char *dest, uint_farptr_t src, size_t len);
extern char *strcat_PF (char *dest, uint_farptr_t src);
extern size_t strlcat_PF (char *dst, uint_farptr_t src, size_t siz);
extern char *strncat_PF (char *dest, uint_farptr_t src, size_t len);
extern int strcmp_PF (const char *s1, uint_farptr_t s2) __ATTR_PURE__;
extern int strncmp_PF (const char *s1, uint_farptr_t s2, size_t n) __ATTR_PURE__;
extern int strcasecmp_PF (const char *s1, uint_farptr_t s2) __ATTR_PURE__;
extern int strncasecmp_PF (const char *s1, uint_farptr_t s2, size_t n) __ATTR_PURE__;
extern char *strstr_PF (const char *s1, uint_farptr_t s2);
extern size_t strlcpy_PF (char *dst, uint_farptr_t src, size_t siz);
#ifdef __cplusplus
}
#endif
#endif /* MOREPGMSPACE_H */
-
- о, еще один суффикс в именах функций для AVR. - megajohn(04.10.2010 16:41)
- полный набор функций не нужен, нужен именно GET_FAR_ADDRESS. Спасибо! - bialix(04.10.2010 16:03)
- Какая красота. Этот макрос предлагалось включить в avr-gcc еще в 2005 году. bialix(422 знак., 04.10.2010 16:09)