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annotate fatfs/diskio.c @ 49:ace431a0d0f5

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Add SDIO code poached from STM. Use FatFS to read from SD card. LFN doesn't work reliably so it's disabled for now.
author Daniel O'Connor <darius@dons.net.au>
date Wed, 03 Apr 2013 23:34:20 +1030
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49
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1 /*-----------------------------------------------------------------------*/
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2 /* Low level disk I/O module skeleton for FatFs (C)ChaN, 2013 */
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3 /*-----------------------------------------------------------------------*/
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4 /* If a working storage control module is available, it should be */
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5 /* attached to the FatFs via a glue function rather than modifying it. */
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6 /* This is an example of glue functions to attach various exsisting */
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7 /* storage control module to the FatFs module with a defined API. */
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8 /*-----------------------------------------------------------------------*/
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9
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10 #include "diskio.h" /* FatFs lower layer API */
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11 #include "usbdisk.h" /* Example: USB drive control */
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12 #include "atadrive.h" /* Example: ATA drive control */
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13 #include "sdcard.h" /* Example: MMC/SDC contorl */
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14
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15 /* Definitions of physical drive number for each media */
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16 #define ATA 0
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17 #define MMC 1
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18 #define USB 2
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19
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20
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21 /*-----------------------------------------------------------------------*/
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22 /* Inidialize a Drive */
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23 /*-----------------------------------------------------------------------*/
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24
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25 DSTATUS disk_initialize (
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26 BYTE pdrv /* Physical drive nmuber (0..) */
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27 )
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28 {
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29 DSTATUS stat;
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30 int result;
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31
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32 switch (pdrv) {
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33 case ATA :
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34 result = ATA_disk_initialize();
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35
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36 // translate the reslut code here
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37
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38 return stat;
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39
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40 case MMC :
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41 result = MMC_disk_initialize();
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42
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43 // translate the reslut code here
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44
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45 return stat;
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46
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47 case USB :
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48 result = USB_disk_initialize();
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49
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50 // translate the reslut code here
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51
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52 return stat;
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53 }
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54 return STA_NOINIT;
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55 }
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56
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57
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58
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59 /*-----------------------------------------------------------------------*/
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60 /* Get Disk Status */
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61 /*-----------------------------------------------------------------------*/
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62
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63 DSTATUS disk_status (
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64 BYTE pdrv /* Physical drive nmuber (0..) */
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65 )
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66 {
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67 DSTATUS stat;
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68 int result;
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69
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70 switch (pdrv) {
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71 case ATA :
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72 result = ATA_disk_status();
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73
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74 // translate the reslut code here
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75
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76 return stat;
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77
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78 case MMC :
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79 result = MMC_disk_status();
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80
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81 // translate the reslut code here
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82
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83 return stat;
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84
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85 case USB :
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86 result = USB_disk_status();
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87
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88 // translate the reslut code here
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89
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90 return stat;
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91 }
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92 return STA_NOINIT;
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93 }
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94
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95
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96
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97 /*-----------------------------------------------------------------------*/
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98 /* Read Sector(s) */
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99 /*-----------------------------------------------------------------------*/
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100
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101 DRESULT disk_read (
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102 BYTE pdrv, /* Physical drive nmuber (0..) */
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103 BYTE *buff, /* Data buffer to store read data */
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104 DWORD sector, /* Sector address (LBA) */
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105 BYTE count /* Number of sectors to read (1..128) */
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106 )
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107 {
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108 DRESULT res;
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109 int result;
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110
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111 switch (pdrv) {
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112 case ATA :
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113 // translate the arguments here
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114
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115 result = ATA_disk_read(buff, sector, count);
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116
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117 // translate the reslut code here
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118
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119 return res;
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120
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121 case MMC :
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122 // translate the arguments here
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123
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124 result = MMC_disk_read(buff, sector, count);
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125
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126 // translate the reslut code here
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127
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128 return res;
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129
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130 case USB :
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131 // translate the arguments here
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132
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133 result = USB_disk_read(buff, sector, count);
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134
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135 // translate the reslut code here
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136
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137 return res;
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138 }
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139 return RES_PARERR;
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140 }
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141
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142
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143
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144 /*-----------------------------------------------------------------------*/
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145 /* Write Sector(s) */
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146 /*-----------------------------------------------------------------------*/
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147
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148 #if _USE_WRITE
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149 DRESULT disk_write (
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150 BYTE pdrv, /* Physical drive nmuber (0..) */
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151 const BYTE *buff, /* Data to be written */
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152 DWORD sector, /* Sector address (LBA) */
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153 BYTE count /* Number of sectors to write (1..128) */
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154 )
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155 {
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156 DRESULT res;
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157 int result;
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158
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159 switch (pdrv) {
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160 case ATA :
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161 // translate the arguments here
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162
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163 result = ATA_disk_write(buff, sector, count);
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164
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165 // translate the reslut code here
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166
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167 return res;
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168
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169 case MMC :
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170 // translate the arguments here
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171
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172 result = MMC_disk_write(buff, sector, count);
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173
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174 // translate the reslut code here
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175
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176 return res;
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177
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178 case USB :
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179 // translate the arguments here
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180
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181 result = USB_disk_write(buff, sector, count);
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182
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183 // translate the reslut code here
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184
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185 return res;
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186 }
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187 return RES_PARERR;
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188 }
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189 #endif
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190
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191
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192 /*-----------------------------------------------------------------------*/
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193 /* Miscellaneous Functions */
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194 /*-----------------------------------------------------------------------*/
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195
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196 #if _USE_IOCTL
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197 DRESULT disk_ioctl (
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198 BYTE pdrv, /* Physical drive nmuber (0..) */
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199 BYTE cmd, /* Control code */
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200 void *buff /* Buffer to send/receive control data */
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201 )
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202 {
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203 DRESULT res;
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204 int result;
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205
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206 switch (pdrv) {
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207 case ATA :
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208 // pre-process here
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209
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210 result = ATA_disk_ioctl(cmd, buff);
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211
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212 // post-process here
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213
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214 return res;
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215
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216 case MMC :
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217 // pre-process here
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218
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219 result = MMC_disk_ioctl(cmd, buff);
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220
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221 // post-process here
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222
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223 return res;
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224
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225 case USB :
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226 // pre-process here
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227
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228 result = USB_disk_ioctl(cmd, buff);
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229
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230 // post-process here
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231
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232 return res;
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233 }
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234 return RES_PARERR;
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235 }
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236 #endif