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annotate fatfs/ff.h @ 59:488085e0c7e1

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author Daniel O'Connor <darius@dons.net.au>
date Mon, 08 Apr 2013 23:10:47 +0930
parents ace431a0d0f5
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*---------------------------------------------------------------------------/
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2 / FatFs - FAT file system module include file R0.09b (C)ChaN, 2013
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3 /----------------------------------------------------------------------------/
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4 / FatFs module is a generic FAT file system module for small embedded systems.
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5 / This is a free software that opened for education, research and commercial
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6 / developments under license policy of following terms.
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7 /
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8 / Copyright (C) 2013, ChaN, all right reserved.
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9 /
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10 / * The FatFs module is a free software and there is NO WARRANTY.
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11 / * No restriction on use. You can use, modify and redistribute it for
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12 / personal, non-profit or commercial product UNDER YOUR RESPONSIBILITY.
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13 / * Redistributions of source code must retain the above copyright notice.
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14 /
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15 /----------------------------------------------------------------------------*/
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16
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17 #ifndef _FATFS
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18 #define _FATFS 82786 /* Revision ID */
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19
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20 #ifdef __cplusplus
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21 extern "C" {
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22 #endif
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23
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24 #include "integer.h" /* Basic integer types */
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25 #include "ffconf.h" /* FatFs configuration options */
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26
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27 #if _FATFS != _FFCONF
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28 #error Wrong configuration file (ffconf.h).
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29 #endif
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30
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32
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33 /* Definitions of volume management */
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34
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35 #if _MULTI_PARTITION /* Multiple partition configuration */
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36 typedef struct {
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37 BYTE pd; /* Physical drive number */
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38 BYTE pt; /* Partition: 0:Auto detect, 1-4:Forced partition) */
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39 } PARTITION;
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40 extern PARTITION VolToPart[]; /* Volume - Partition resolution table */
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41 #define LD2PD(vol) (VolToPart[vol].pd) /* Get physical drive number */
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42 #define LD2PT(vol) (VolToPart[vol].pt) /* Get partition index */
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43
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44 #else /* Single partition configuration */
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45 #define LD2PD(vol) (BYTE)(vol) /* Each logical drive is bound to the same physical drive number */
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46 #define LD2PT(vol) 0 /* Always mounts the 1st partition or in SFD */
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47
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48 #endif
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49
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51
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52 /* Type of path name strings on FatFs API */
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53
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54 #if _LFN_UNICODE /* Unicode string */
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55 #if !_USE_LFN
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56 #error _LFN_UNICODE must be 0 in non-LFN cfg.
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57 #endif
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58 #ifndef _INC_TCHAR
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59 typedef WCHAR TCHAR;
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60 #define _T(x) L ## x
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61 #define _TEXT(x) L ## x
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62 #endif
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63
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64 #else /* ANSI/OEM string */
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65 #ifndef _INC_TCHAR
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66 typedef char TCHAR;
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67 #define _T(x) x
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68 #define _TEXT(x) x
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69 #endif
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70
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71 #endif
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72
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73
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74
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75 /* File system object structure (FATFS) */
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76
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77 typedef struct {
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78 BYTE fs_type; /* FAT sub-type (0:Not mounted) */
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79 BYTE drv; /* Physical drive number */
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80 BYTE csize; /* Sectors per cluster (1,2,4...128) */
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81 BYTE n_fats; /* Number of FAT copies (1,2) */
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82 BYTE wflag; /* win[] dirty flag (1:must be written back) */
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83 BYTE fsi_flag; /* fsinfo dirty flag (1:must be written back) */
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84 WORD id; /* File system mount ID */
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85 WORD n_rootdir; /* Number of root directory entries (FAT12/16) */
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86 #if _MAX_SS != 512
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87 WORD ssize; /* Bytes per sector (512, 1024, 2048 or 4096) */
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88 #endif
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89 #if _FS_REENTRANT
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90 _SYNC_t sobj; /* Identifier of sync object */
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91 #endif
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92 #if !_FS_READONLY
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93 DWORD last_clust; /* Last allocated cluster */
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94 DWORD free_clust; /* Number of free clusters */
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95 DWORD fsi_sector; /* fsinfo sector (FAT32) */
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96 #endif
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97 #if _FS_RPATH
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98 DWORD cdir; /* Current directory start cluster (0:root) */
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99 #endif
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100 DWORD n_fatent; /* Number of FAT entries (= number of clusters + 2) */
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101 DWORD fsize; /* Sectors per FAT */
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102 DWORD volbase; /* Volume start sector */
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103 DWORD fatbase; /* FAT start sector */
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104 DWORD dirbase; /* Root directory start sector (FAT32:Cluster#) */
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105 DWORD database; /* Data start sector */
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106 DWORD winsect; /* Current sector appearing in the win[] */
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107 BYTE win[_MAX_SS]; /* Disk access window for Directory, FAT (and Data on tiny cfg) */
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108 } FATFS;
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109
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110
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111
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112 /* File object structure (FIL) */
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113
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114 typedef struct {
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115 FATFS* fs; /* Pointer to the related file system object (**do not change order**) */
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116 WORD id; /* Owner file system mount ID (**do not change order**) */
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117 BYTE flag; /* File status flags */
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118 BYTE pad1;
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119 DWORD fptr; /* File read/write pointer (0ed on file open) */
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120 DWORD fsize; /* File size */
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121 DWORD sclust; /* File data start cluster (0:no data cluster, always 0 when fsize is 0) */
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122 DWORD clust; /* Current cluster of fpter */
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123 DWORD dsect; /* Current data sector of fpter */
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124 #if !_FS_READONLY
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125 DWORD dir_sect; /* Sector containing the directory entry */
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126 BYTE* dir_ptr; /* Pointer to the directory entry in the window */
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127 #endif
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128 #if _USE_FASTSEEK
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129 DWORD* cltbl; /* Pointer to the cluster link map table (null on file open) */
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130 #endif
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131 #if _FS_LOCK
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132 UINT lockid; /* File lock ID (index of file semaphore table Files[]) */
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133 #endif
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134 #if !_FS_TINY
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135 BYTE buf[_MAX_SS]; /* File data read/write buffer */
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136 #endif
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137 } FIL;
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138
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139
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140
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141 /* Directory object structure (DIR) */
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142
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143 typedef struct {
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144 FATFS* fs; /* Pointer to the owner file system object (**do not change order**) */
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145 WORD id; /* Owner file system mount ID (**do not change order**) */
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146 WORD index; /* Current read/write index number */
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147 DWORD sclust; /* Table start cluster (0:Root dir) */
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148 DWORD clust; /* Current cluster */
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149 DWORD sect; /* Current sector */
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150 BYTE* dir; /* Pointer to the current SFN entry in the win[] */
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151 BYTE* fn; /* Pointer to the SFN (in/out) {file[8],ext[3],status[1]} */
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152 #if _USE_LFN
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153 WCHAR* lfn; /* Pointer to the LFN working buffer */
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154 WORD lfn_idx; /* Last matched LFN index number (0xFFFF:No LFN) */
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155 #endif
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156 } DIR;
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157
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158
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159
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160 /* File status structure (FILINFO) */
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161
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162 typedef struct {
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163 DWORD fsize; /* File size */
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164 WORD fdate; /* Last modified date */
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165 WORD ftime; /* Last modified time */
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166 BYTE fattrib; /* Attribute */
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167 TCHAR fname[13]; /* Short file name (8.3 format) */
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168 #if _USE_LFN
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169 TCHAR* lfname; /* Pointer to the LFN buffer */
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170 UINT lfsize; /* Size of LFN buffer in TCHAR */
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171 #endif
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172 } FILINFO;
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173
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174
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175
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176 /* File function return code (FRESULT) */
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177
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178 typedef enum {
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179 FR_OK = 0, /* (0) Succeeded */
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180 FR_DISK_ERR, /* (1) A hard error occurred in the low level disk I/O layer */
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181 FR_INT_ERR, /* (2) Assertion failed */
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182 FR_NOT_READY, /* (3) The physical drive cannot work */
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183 FR_NO_FILE, /* (4) Could not find the file */
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184 FR_NO_PATH, /* (5) Could not find the path */
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185 FR_INVALID_NAME, /* (6) The path name format is invalid */
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186 FR_DENIED, /* (7) Access denied due to prohibited access or directory full */
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187 FR_EXIST, /* (8) Access denied due to prohibited access */
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188 FR_INVALID_OBJECT, /* (9) The file/directory object is invalid */
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189 FR_WRITE_PROTECTED, /* (10) The physical drive is write protected */
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190 FR_INVALID_DRIVE, /* (11) The logical drive number is invalid */
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191 FR_NOT_ENABLED, /* (12) The volume has no work area */
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192 FR_NO_FILESYSTEM, /* (13) There is no valid FAT volume */
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193 FR_MKFS_ABORTED, /* (14) The f_mkfs() aborted due to any parameter error */
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194 FR_TIMEOUT, /* (15) Could not get a grant to access the volume within defined period */
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195 FR_LOCKED, /* (16) The operation is rejected according to the file sharing policy */
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196 FR_NOT_ENOUGH_CORE, /* (17) LFN working buffer could not be allocated */
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197 FR_TOO_MANY_OPEN_FILES, /* (18) Number of open files > _FS_SHARE */
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198 FR_INVALID_PARAMETER /* (19) Given parameter is invalid */
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199 } FRESULT;
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200
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201
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202
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203 /*--------------------------------------------------------------*/
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204 /* FatFs module application interface */
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205
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206 FRESULT f_mount (BYTE vol, FATFS* fs); /* Mount/Unmount a logical drive */
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207 FRESULT f_open (FIL* fp, const TCHAR* path, BYTE mode); /* Open or create a file */
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208 FRESULT f_read (FIL* fp, void* buff, UINT btr, UINT* br); /* Read data from a file */
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209 FRESULT f_lseek (FIL* fp, DWORD ofs); /* Move file pointer of a file object */
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210 FRESULT f_close (FIL* fp); /* Close an open file object */
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211 FRESULT f_opendir (DIR* dj, const TCHAR* path); /* Open an existing directory */
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212 FRESULT f_readdir (DIR* dj, FILINFO* fno); /* Read a directory item */
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213 FRESULT f_stat (const TCHAR* path, FILINFO* fno); /* Get file status */
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214 FRESULT f_write (FIL* fp, const void* buff, UINT btw, UINT* bw); /* Write data to a file */
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215 FRESULT f_getfree (const TCHAR* path, DWORD* nclst, FATFS** fatfs); /* Get number of free clusters on the drive */
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216 FRESULT f_truncate (FIL* fp); /* Truncate file */
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217 FRESULT f_sync (FIL* fp); /* Flush cached data of a writing file */
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218 FRESULT f_unlink (const TCHAR* path); /* Delete an existing file or directory */
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219 FRESULT f_mkdir (const TCHAR* path); /* Create a new directory */
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220 FRESULT f_chmod (const TCHAR* path, BYTE value, BYTE mask); /* Change attribute of the file/dir */
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221 FRESULT f_utime (const TCHAR* path, const FILINFO* fno); /* Change times-tamp of the file/dir */
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222 FRESULT f_rename (const TCHAR* path_old, const TCHAR* path_new); /* Rename/Move a file or directory */
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223 FRESULT f_chdrive (BYTE drv); /* Change current drive */
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224 FRESULT f_chdir (const TCHAR* path); /* Change current directory */
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225 FRESULT f_getcwd (TCHAR* buff, UINT len); /* Get current directory */
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226 FRESULT f_getlabel (const TCHAR* path, TCHAR* label, DWORD* sn); /* Get volume label */
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227 FRESULT f_setlabel (const TCHAR* label); /* Set volume label */
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228 FRESULT f_forward (FIL* fp, UINT(*func)(const BYTE*,UINT), UINT btf, UINT* bf); /* Forward data to the stream */
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229 FRESULT f_mkfs (BYTE vol, BYTE sfd, UINT au); /* Create a file system on the drive */
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230 FRESULT f_fdisk (BYTE pdrv, const DWORD szt[], void* work); /* Divide a physical drive into some partitions */
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231 int f_putc (TCHAR c, FIL* fp); /* Put a character to the file */
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232 int f_puts (const TCHAR* str, FIL* cp); /* Put a string to the file */
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233 int f_printf (FIL* fp, const TCHAR* str, ...); /* Put a formatted string to the file */
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234 TCHAR* f_gets (TCHAR* buff, int len, FIL* fp); /* Get a string from the file */
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235
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236 #define f_eof(fp) (((fp)->fptr == (fp)->fsize) ? 1 : 0)
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237 #define f_error(fp) (((fp)->flag & FA__ERROR) ? 1 : 0)
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238 #define f_tell(fp) ((fp)->fptr)
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239 #define f_size(fp) ((fp)->fsize)
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240
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241 #ifndef EOF
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242 #define EOF (-1)
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243 #endif
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244
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245
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246
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247
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248 /*--------------------------------------------------------------*/
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249 /* Additional user defined functions */
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250
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251 /* RTC function */
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252 #if !_FS_READONLY
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253 DWORD get_fattime (void);
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254 #endif
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255
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256 /* Unicode support functions */
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257 #if _USE_LFN /* Unicode - OEM code conversion */
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258 WCHAR ff_convert (WCHAR chr, UINT dir); /* OEM-Unicode bidirectional conversion */
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259 WCHAR ff_wtoupper (WCHAR chr); /* Unicode upper-case conversion */
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260 #if _USE_LFN == 3 /* Memory functions */
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261 void* ff_memalloc (UINT msize); /* Allocate memory block */
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262 void ff_memfree (void* mblock); /* Free memory block */
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263 #endif
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264 #endif
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265
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266 /* Sync functions */
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267 #if _FS_REENTRANT
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268 int ff_cre_syncobj (BYTE vol, _SYNC_t* sobj); /* Create a sync object */
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269 int ff_req_grant (_SYNC_t sobj); /* Lock sync object */
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270 void ff_rel_grant (_SYNC_t sobj); /* Unlock sync object */
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271 int ff_del_syncobj (_SYNC_t sobj); /* Delete a sync object */
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272 #endif
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273
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274
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275
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276
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277 /*--------------------------------------------------------------*/
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278 /* Flags and offset address */
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279
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280
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281 /* File access control and file status flags (FIL.flag) */
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282
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283 #define FA_READ 0x01
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284 #define FA_OPEN_EXISTING 0x00
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285 #define FA__ERROR 0x80
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286
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287 #if !_FS_READONLY
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288 #define FA_WRITE 0x02
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289 #define FA_CREATE_NEW 0x04
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290 #define FA_CREATE_ALWAYS 0x08
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291 #define FA_OPEN_ALWAYS 0x10
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292 #define FA__WRITTEN 0x20
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293 #define FA__DIRTY 0x40
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294 #endif
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295
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296
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297 /* FAT sub type (FATFS.fs_type) */
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298
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299 #define FS_FAT12 1
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300 #define FS_FAT16 2
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301 #define FS_FAT32 3
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302
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303
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304 /* File attribute bits for directory entry */
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305
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306 #define AM_RDO 0x01 /* Read only */
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307 #define AM_HID 0x02 /* Hidden */
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308 #define AM_SYS 0x04 /* System */
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309 #define AM_VOL 0x08 /* Volume label */
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310 #define AM_LFN 0x0F /* LFN entry */
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311 #define AM_DIR 0x10 /* Directory */
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312 #define AM_ARC 0x20 /* Archive */
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313 #define AM_MASK 0x3F /* Mask of defined bits */
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314
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315
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316 /* Fast seek feature */
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317 #define CREATE_LINKMAP 0xFFFFFFFF
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318
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319
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320
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321 /*--------------------------------*/
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322 /* Multi-byte word access macros */
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323
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324 #if _WORD_ACCESS == 1 /* Enable word access to the FAT structure */
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325 #define LD_WORD(ptr) (WORD)(*(WORD*)(BYTE*)(ptr))
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326 #define LD_DWORD(ptr) (DWORD)(*(DWORD*)(BYTE*)(ptr))
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327 #define ST_WORD(ptr,val) *(WORD*)(BYTE*)(ptr)=(WORD)(val)
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328 #define ST_DWORD(ptr,val) *(DWORD*)(BYTE*)(ptr)=(DWORD)(val)
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329 #else /* Use byte-by-byte access to the FAT structure */
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330 #define LD_WORD(ptr) (WORD)(((WORD)*((BYTE*)(ptr)+1)<<8)|(WORD)*(BYTE*)(ptr))
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331 #define LD_DWORD(ptr) (DWORD)(((DWORD)*((BYTE*)(ptr)+3)<<24)|((DWORD)*((BYTE*)(ptr)+2)<<16)|((WORD)*((BYTE*)(ptr)+1)<<8)|*(BYTE*)(ptr))
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332 #define ST_WORD(ptr,val) *(BYTE*)(ptr)=(BYTE)(val); *((BYTE*)(ptr)+1)=(BYTE)((WORD)(val)>>8)
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333 #define ST_DWORD(ptr,val) *(BYTE*)(ptr)=(BYTE)(val); *((BYTE*)(ptr)+1)=(BYTE)((WORD)(val)>>8); *((BYTE*)(ptr)+2)=(BYTE)((DWORD)(val)>>16); *((BYTE*)(ptr)+3)=(BYTE)((DWORD)(val)>>24)
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334 #endif
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335
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336 #ifdef __cplusplus
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337 }
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338 #endif
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339
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340 #endif /* _FATFS */