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Add shorthand macro F16() for defining numeric constants

This commit is contained in:
Petteri.Aimonen 2012-08-30 16:52:52 +00:00
parent 0bec62409b
commit 10af3a6c60
1 changed files with 9 additions and 0 deletions
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9
libfixmath/fix16.h
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@ -75,7 +75,16 @@ static inline fix16_t fix16_from_dbl(double a)
return (fix16_t)temp;
}
/* Macro for defining fix16_t constant values.
The functions above can't be used from e.g. global variable initializers,
and their names are quite long also. This macro is useful for constants
springled alongside code, e.g. F16(1.234).
Note that the argument is evaluated multiple times, and also otherwise
you should only use this for constant values. For runtime-conversions,
use the functions above.
*/
#define F16(x) ((fix16_t)(((x) >= 0) ? ((x) * 65536.0 + 0.5) : ((x) * 65536.0 - 0.5)))
static inline fix16_t fix16_abs(fix16_t x)
{ return (x < 0 ? -x : x); }