arch/avr8/include/arch/progmem.h

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#ifndef ARCH_PROGMEM_H_INCLUDED
#define ARCH_PROGMEM_H_INCLUDED

#include <stdint.h>

#if defined(__GNUC__)
# define __progmem                      __attribute__((__progmem__))
# define __progmem_arg
# define DECLARE_PROGMEM(type, name)    const type name __progmem
# define DEFINE_PROGMEM(type, name)     const type name __progmem

static inline uint8_t progmem_read8(const uint8_t *p)
{
        uint8_t value;

        asm("lpm %0, Z" : "=r"(value) : "z"(p));

        return value;
}

static inline uint16_t progmem_read16(const uint16_t *p)
{
        uint16_t value;

        asm("lpm %A0, Z+\n\t"
                "lpm %B0, Z"
                : "=&r"(value), "+z"(p));

        return value;
}

static inline uint32_t progmem_read32(const uint32_t *p)
{
        uint32_t value;

        asm("lpm %A0, Z+\n\t"
                "lpm %B0, Z+\n\t"
                "lpm %C0, Z+\n\t"
                "lpm %D0, Z"
                : "=&r"(value), "+z"(p));

        return value;
}

#elif defined(__ICCAVR__)

# if defined(CONFIG_MEMORY_MODEL_TINY) || defined(CONFIG_MEMORY_MODEL_SMALL)
#  define __progmem                      __flash
#  define __progmem_arg                  __flash
# elif defined(CONFIG_MEMORY_MODEL_LARGE)
#  define __progmem                      __farflash
#  define __progmem_arg                  __farflash
# endif

# define DECLARE_PROGMEM(type, name)    const __progmem type name
# define DEFINE_PROGMEM(type, name)     const __progmem type name

static inline uint8_t progmem_read8(const uint8_t __progmem *p)
{
        return *p;
}

static inline uint16_t progmem_read16(const uint16_t __progmem *p)
{
        return *p;
}

static inline uint32_t progmem_read32(const uint32_t __progmem *p)
{
        return *p;
}

#elif defined(__DOXYGEN__)

/*
 * Basically this is a copy of GCCs implementation, tuned for making doxygen
 * not output warnings while generating the documentation.
 */

# define __progmem                      __attribute__((__progmem__))
# define __progmem_arg
# define DECLARE_PROGMEM(type, name)    const type name __progmem
# define DEFINE_PROGMEM(type, name)     const type name __progmem

static inline uint8_t progmem_read8(const uint8_t __progmem *p)
{
}

static inline uint16_t progmem_read16(const uint16_t __progmem *p)
{
}

static inline uint32_t progmem_read32(const uint32_t __progmem *p)
{
}

#endif /* __DOXYGEN__ */


#endif /* ARCH_PROGMEM_H_INCLUDED */

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