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#ifndef UTIL_H_
#define UTIL_H_
#include <stdint.h>
#include <avr/eeprom.h>
#include <avr/interrupt.h>
#include <avr/pgmspace.h>
/* Some of these macros are derived from the Linux Kernel sources. */
#define likely(x) __builtin_expect(!!(x), 1)
#define unlikely(x) __builtin_expect(!!(x), 0)
#undef offsetof
#define offsetof(type, member) ((size_t)&((type *)0)->member)
#define min(a, b) ((a) < (b) ? (a) : (b))
#define max(a, b) ((a) > (b) ? (a) : (b))
#define abs(x) ({ \
__typeof__(x) __x = (x); \
(__x < 0) ? -__x : __x; \
})
#define lo8(x) ((uint8_t)(x))
#define hi8(x) ((uint8_t)((x) >> 8))
#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
/* Memory barrier.
* The CPU doesn't have runtime reordering, so we just
* need a compiler memory clobber. */
#define mb() __asm__ __volatile__("" : : : "memory")
/* Convert something indirectly to a string */
#define __stringify(x) #x
#define stringify(x) __stringify(x)
/* Assertions */
void panic(const prog_char *msg) __attribute__((noreturn));
#define BUILD_BUG_ON(x) ((void)sizeof(char[1 - 2 * !!(x)]))
#define BUG_ON(x) \
do { \
if (unlikely(x)) \
panic(PSTR(__FILE__ \
stringify(__LINE__))); \
} while (0)
void infinite_sleep(void) __attribute__((noreturn));
/* Delay */
void mdelay(uint16_t msecs);
void udelay(uint16_t usecs);
typedef _Bool bool;
/* IRQ handling.
* We use a macro for irq_disable_save(), because stupid gcc is not
* able to properly optimize an inline function that returns a value.
*/
#define irq_disable_save() ({ \
uint8_t sreg_flags = SREG; \
cli(); \
sreg_flags; \
})
static inline void irq_restore(uint8_t sreg_flags)
{
mb();
SREG = sreg_flags;
}
#define irqs_disabled() (!(SREG & (1 << SREG_I)))
uint16_t crc16_block_update(uint16_t crc, const void *data, uint16_t size);
#endif /* UTIL_H_ */
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