1 

14 /*

15  * Copyright (c) 2006-2011 by Roland Riegel <feedback@roland-riegel.de>

16  *

17  * This file is free software; you can redistribute it and/or modify

18  * it under the terms of either the GNU General Public License version 2

19  * or the GNU Lesser General Public License version 2.1, both as

20  * published by the Free Software Foundation.

21  */

22 

23 #include "byteordering.h"

24 

39 #if DOXYGEN || SWAP_NEEDED

40 

48 uint16_t swap16(uint16_t i)

49 {

50  return SWAP16(i);

51 }

52 

60 uint32_t swap32(uint32_t i)

61 {

62  return SWAP32(i);

63 }

64 

65 #endif

66 

67 #if DOXYGEN || !__AVR__

68 

75 uint16_t read16(const uint8_t* p)

76 {

77  return (((uint16_t) p[1]) << 8) |

78  (((uint16_t) p[0]) << 0);

79 }

80 

87 uint32_t read32(const uint8_t* p)

88 {

89  return (((uint32_t) p[3]) << 24) |

90  (((uint32_t) p[2]) << 16) |

91  (((uint32_t) p[1]) << 8) |

92  (((uint32_t) p[0]) << 0);

93 }

94 

101 void write16(uint8_t* p, uint16_t i)

102 {

103  p[1] = (uint8_t) ((i & 0xff00) >> 8);

104  p[0] = (uint8_t) ((i & 0x00ff) >> 0);

105 }

106 

113 void write32(uint8_t* p, uint32_t i)

114 {

115  p[3] = (uint8_t) ((i & 0xff000000) >> 24);

116  p[2] = (uint8_t) ((i & 0x00ff0000) >> 16);

117  p[1] = (uint8_t) ((i & 0x0000ff00) >> 8);

118  p[0] = (uint8_t) ((i & 0x000000ff) >> 0);

119 }

120 

121 #endif

122