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annotate network/Lib/RingBuff.c @ 110:4eb5a746d7af avr-http

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Import avrusbmodem code minus the USB bits. Not built yet.
author Matt Johnston <matt@ucc.asn.au>
date Sat, 15 Sep 2012 21:49:05 +0800
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110
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1 /*
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2 LUFA Library
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3 Copyright (C) Dean Camera, 2010.
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4
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5 dean [at] fourwalledcubicle [dot] com
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6 www.fourwalledcubicle.com
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7 */
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8
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9 /*
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10 Copyright 2010 Dean Camera (dean [at] fourwalledcubicle [dot] com)
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11
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12 Permission to use, copy, modify, distribute, and sell this
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13 software and its documentation for any purpose is hereby granted
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14 without fee, provided that the above copyright notice appear in
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15 all copies and that both that the copyright notice and this
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16 permission notice and warranty disclaimer appear in supporting
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17 documentation, and that the name of the author not be used in
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18 advertising or publicity pertaining to distribution of the
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19 software without specific, written prior permission.
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20
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21 The author disclaim all warranties with regard to this
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22 software, including all implied warranties of merchantability
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23 and fitness. In no event shall the author be liable for any
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24 special, indirect or consequential damages or any damages
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25 whatsoever resulting from loss of use, data or profits, whether
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26 in an action of contract, negligence or other tortious action,
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27 arising out of or in connection with the use or performance of
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28 this software.
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29 */
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30
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31 #include "RingBuff.h"
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32
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33 void Buffer_Initialize(RingBuff_t* const Buffer)
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34 {
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35 BUFF_ATOMIC_BLOCK
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36 {
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37 Buffer->InPtr = (RingBuff_Data_t*)&Buffer->Buffer;
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38 Buffer->OutPtr = (RingBuff_Data_t*)&Buffer->Buffer;
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39 Buffer->Elements = 0;
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40 }
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41 }
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42
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43 void Buffer_StoreElement(RingBuff_t* const Buffer,
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44 RingBuff_Data_t Data)
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45 {
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46 BUFF_ATOMIC_BLOCK
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47 {
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48 #if defined(BUFF_DROPOLD)
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49 if (Buffer->Elements == BUFF_LENGTH)
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50 {
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51 Buffer->OutPtr++;
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52
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53 if (Buffer->OutPtr == &Buffer->Buffer[BUFF_LENGTH])
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54 Buffer->OutPtr = (RingBuff_Data_t*)&Buffer->Buffer;
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55 }
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56 else
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57 {
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58 Buffer->Elements++;
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59 }
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60 #elif defined(BUFF_DROPNEW)
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61 if (Buffer->Elements == BUFF_LENGTH)
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62 return;
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63
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64 Buffer->Elements++;
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65 #elif defined(BUFF_NODROPCHECK)
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66 Buffer->Elements++;
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67 #endif
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68
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69 *(Buffer->InPtr) = Data;
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70 Buffer->InPtr++;
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71
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72 if (Buffer->InPtr == &Buffer->Buffer[BUFF_LENGTH])
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73 Buffer->InPtr = (RingBuff_Data_t*)&Buffer->Buffer;
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74 }
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75 }
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76
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77 RingBuff_Data_t Buffer_GetElement(RingBuff_t* const Buffer)
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78 {
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79 RingBuff_Data_t BuffData;
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80
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81 BUFF_ATOMIC_BLOCK
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82 {
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83 #if defined(BUFF_EMPTYRETURNSZERO)
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84 if (!(Buffer->Elements))
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85 return 0;
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86 #elif !defined(BUFF_NOEMPTYCHECK)
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87 #error No empty buffer check behavior specified.
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88 #endif
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89
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90 BuffData = *(Buffer->OutPtr);
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91
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92 Buffer->OutPtr++;
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93 Buffer->Elements--;
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94
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95 if (Buffer->OutPtr == &Buffer->Buffer[BUFF_LENGTH])
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96 Buffer->OutPtr = (RingBuff_Data_t*)&Buffer->Buffer;
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97 }
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98
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99 return BuffData;
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100 }
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101
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102 #if defined(BUFF_USEPEEK)
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103 RingBuff_Data_t Buffer_PeekElement(const RingBuff_t* const Buffer)
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104 {
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105 RingBuff_Data_t BuffData;
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106
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107 BUFF_ATOMIC_BLOCK
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108 {
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109 #if defined(BUFF_EMPTYRETURNSZERO)
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110 if (!(Buffer->Elements))
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111 return 0;
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112 #elif !defined(BUFF_NOEMPTYCHECK)
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113 #error No empty buffer check behavior specified.
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114 #endif
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115
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116 BuffData = *(Buffer->OutPtr);
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117 }
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118
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119 return BuffData;
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120 }
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121 #endif