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iRiver: SWAB16 and SWAB32 macros

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@5433 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Linus Nielsen Feltzing 2004-11-19 00:30:28 +00:00
parent 3ad0879f19
commit 7c5f5f5c53
1 changed files with 22 additions and 0 deletions
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22
firmware/export/system.h
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@ -155,6 +155,28 @@ static inline int set_irq_level(int level)
return oldlevel;
}
static inline unsigned short SWAB16(unsigned short value)
/*
result[15..8] = value[ 7..0];
result[ 7..0] = value[15..8];
*/
{
return (value >> 8) | (value << 8);
}
static inline unsigned long SWAB32(unsigned long value)
/*
result[31..24] = value[ 7.. 0];
result[23..16] = value[15.. 8];
result[15.. 8] = value[23..16];
result[ 7.. 0] = value[31..24];
*/
{
unsigned short hi = SWAB16(value >> 16);
unsigned short lo = SWAB16(value & 0xffff);
return (lo << 16) | hi;
}
#endif
#endif