diff options
Diffstat (limited to 'LUFA/Common')
| -rw-r--r-- | LUFA/Common/Common.h | 39 |
1 files changed, 34 insertions, 5 deletions
diff --git a/LUFA/Common/Common.h b/LUFA/Common/Common.h index 7fd15554c..76144f94b 100644 --- a/LUFA/Common/Common.h +++ b/LUFA/Common/Common.h @@ -174,7 +174,21 @@ static inline uint16_t SwapEndian_16(uint16_t Word) ATTR_WARN_UNUSED_RESULT ATTR_CONST; static inline uint16_t SwapEndian_16(uint16_t Word) { - return ((Word >> 8) | (Word << 8)); + uint8_t Temp; + + union + { + uint16_t Word; + uint8_t Bytes[2]; + } Data; + + Data.Word = Word; + + Temp = Data.Bytes[0]; + Data.Bytes[0] = Data.Bytes[1]; + Data.Bytes[1] = Temp; + + return Data.Word; } /** Function to reverse the byte ordering of the individual bytes in a 32 bit number. @@ -186,10 +200,25 @@ static inline uint32_t SwapEndian_32(uint32_t DWord) ATTR_WARN_UNUSED_RESULT ATTR_CONST; static inline uint32_t SwapEndian_32(uint32_t DWord) { - return (((DWord & 0xFF000000) >> 24) | - ((DWord & 0x00FF0000) >> 8) | - ((DWord & 0x0000FF00) << 8) | - ((DWord & 0x000000FF) << 24)); + uint8_t Temp; + + union + { + uint32_t DWord; + uint8_t Bytes[4]; + } Data; + + Data.DWord = DWord; + + Temp = Data.Bytes[0]; + Data.Bytes[0] = Data.Bytes[3]; + Data.Bytes[3] = Temp; + + Temp = Data.Bytes[1]; + Data.Bytes[1] = Data.Bytes[2]; + Data.Bytes[2] = Temp; + + return Data.DWord; } /** Function to reverse the byte ordering of the individual bytes in a n byte number. |