1 | /* |
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2 | io_m3sd.c |
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3 | |
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4 | Hardware Routines for reading a Secure Digital card |
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5 | using the M3 SD |
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6 | |
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7 | Some code based on M3 SD drivers supplied by M3Adapter. |
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8 | Some code written by SaTa may have been unknowingly used. |
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9 | |
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10 | Copyright (c) 2006 Michael "Chishm" Chisholm |
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11 | |
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12 | Redistribution and use in source and binary forms, with or without modification, |
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13 | are permitted provided that the following conditions are met: |
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14 | |
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15 | 1. Redistributions of source code must retain the above copyright notice, |
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16 | this list of conditions and the following disclaimer. |
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17 | 2. Redistributions in binary form must reproduce the above copyright notice, |
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18 | this list of conditions and the following disclaimer in the documentation and/or |
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19 | other materials provided with the distribution. |
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20 | 3. The name of the author may not be used to endorse or promote products derived |
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21 | from this software without specific prior written permission. |
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22 | |
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23 | THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
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24 | WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY |
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25 | AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE |
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26 | LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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27 | DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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28 | LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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29 | THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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30 | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, |
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31 | EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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32 | |
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33 | 2006-07-25 - Chishm |
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34 | * Improved startup function that doesn't delay hundreds of seconds |
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35 | before reporting no card inserted. |
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36 | * Fixed writeData function to timeout on error |
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37 | * writeSectors function now wait until the card is ready before continuing with a transfer |
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38 | |
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39 | 2006-08-05 - Chishm |
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40 | * Tries multiple times to get a Relative Card Address at startup |
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41 | |
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42 | 2006-08-07 - Chishm |
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43 | * Moved the SD initialization to a common function |
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44 | */ |
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45 | |
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46 | #include "io_m3sd.h" |
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47 | #include "io_sd_common.h" |
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48 | #include "io_m3_common.h" |
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49 | |
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50 | //--------------------------------------------------------------- |
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51 | // M3SD register addresses |
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52 | |
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53 | #define REG_M3SD_DIR (*(vu16*)0x08800000) // direction control register |
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54 | #define REG_M3SD_DAT (*(vu16*)0x09000000) // SD data line, 8 bits at a time |
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55 | #define REG_M3SD_CMD (*(vu16*)0x09200000) // SD command byte |
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56 | #define REG_M3SD_ARGH (*(vu16*)0x09400000) // SD command argument, high halfword |
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57 | #define REG_M3SD_ARGL (*(vu16*)0x09600000) // SD command argument, low halfword |
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58 | #define REG_M3SD_STS (*(vu16*)0x09800000) // command and status register |
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59 | |
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60 | //--------------------------------------------------------------- |
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61 | // Send / receive timeouts, to stop infinite wait loops |
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62 | #define NUM_STARTUP_CLOCKS 100 // Number of empty (0xFF when sending) bytes to send/receive to/from the card |
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63 | #define TRANSMIT_TIMEOUT 20000 // Time to wait for the M3 to respond to transmit or receive requests |
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64 | #define RESPONSE_TIMEOUT 256 // Number of clocks sent to the SD card before giving up |
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65 | #define WRITE_TIMEOUT 3000 // Time to wait for the card to finish writing |
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66 | |
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67 | //--------------------------------------------------------------- |
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68 | // Variables required for tracking SD state |
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69 | static u32 _M3SD_relativeCardAddress = 0; // Preshifted Relative Card Address |
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70 | |
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71 | //--------------------------------------------------------------- |
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72 | // Internal M3 SD functions |
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73 | |
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74 | static inline void _M3SD_unlock (void) { |
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75 | _M3_changeMode (M3_MODE_MEDIA); |
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76 | } |
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77 | |
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78 | static inline bool _M3SD_waitOnBusy (void) { |
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79 | int i = 0; |
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80 | while ( (REG_M3SD_STS & 0x01) == 0x00) { |
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81 | i++; |
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82 | if (i >= TRANSMIT_TIMEOUT) { |
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83 | return false; |
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84 | } |
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85 | } |
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86 | return true; |
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87 | } |
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88 | |
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89 | static inline bool _M3SD_waitForDataReady (void) { |
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90 | int i = 0; |
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91 | while ( (REG_M3SD_STS & 0x40) == 0x00) { |
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92 | i++; |
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93 | if (i >= TRANSMIT_TIMEOUT) { |
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94 | return false; |
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95 | } |
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96 | } |
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97 | return true; |
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98 | } |
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99 | |
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100 | |
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101 | static bool _M3SD_sendCommand (u16 command, u32 argument) { |
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102 | REG_M3SD_STS = 0x8; |
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103 | REG_M3SD_CMD = 0x40 + command; // Include the start bit |
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104 | REG_M3SD_ARGH = argument >> 16; |
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105 | REG_M3SD_ARGL = argument; |
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106 | // The CRC7 of the command is calculated by the M3 |
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107 | |
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108 | REG_M3SD_DIR=0x29; |
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109 | if (!_M3SD_waitOnBusy()) { |
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110 | REG_M3SD_DIR=0x09; |
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111 | return false; |
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112 | } |
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113 | REG_M3SD_DIR=0x09; |
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114 | return true; |
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115 | } |
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116 | |
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117 | static bool _M3SD_sendByte (u8 byte) { |
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118 | int i = 0; |
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119 | REG_M3SD_DAT = byte; |
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120 | REG_M3SD_DIR = 0x03; |
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121 | REG_M3SD_STS = 0x01; |
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122 | while ((REG_M3SD_STS & 0x04) == 0) { |
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123 | i++; |
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124 | if (i >= TRANSMIT_TIMEOUT) { |
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125 | return false; |
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126 | } |
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127 | } |
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128 | return true; |
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129 | } |
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130 | |
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131 | static u8 _M3SD_getByte (void) { |
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132 | int i; |
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133 | // Request 8 bits of data from the SD's CMD pin |
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134 | REG_M3SD_DIR = 0x02; |
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135 | REG_M3SD_STS = 0x02; |
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136 | // Wait for the data to be ready |
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137 | i = 0; |
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138 | while ((REG_M3SD_STS & 0x08) == 0) { |
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139 | i++; |
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140 | if (i >= TRANSMIT_TIMEOUT) { |
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141 | // Return an empty byte if a timeout occurs |
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142 | return 0xFF; |
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143 | } |
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144 | } |
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145 | i = 0; |
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146 | while ((REG_M3SD_STS & 0x08) != 0) { |
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147 | i++; |
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148 | if (i >= TRANSMIT_TIMEOUT) { |
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149 | // Return an empty byte if a timeout occurs |
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150 | return 0xFF; |
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151 | } |
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152 | } |
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153 | // Return the data |
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154 | return (REG_M3SD_DAT & 0xff); |
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155 | } |
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156 | |
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157 | // Returns the response from the SD card to a previous command. |
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158 | static bool _M3SD_getResponse (u8* dest, u32 length) { |
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159 | u32 i; |
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160 | u8 dataByte; |
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161 | int shiftAmount; |
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162 | |
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163 | // Wait for the card to be non-busy |
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164 | for (i = 0; i < RESPONSE_TIMEOUT; i++) { |
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165 | dataByte = _M3SD_getByte(); |
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166 | if (dataByte != SD_CARD_BUSY) { |
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167 | break; |
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168 | } |
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169 | } |
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170 | |
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171 | if (dest == NULL) { |
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172 | return true; |
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173 | } |
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174 | |
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175 | // Still busy after the timeout has passed |
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176 | if (dataByte == 0xff) { |
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177 | return false; |
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178 | } |
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179 | |
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180 | // Read response into buffer |
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181 | for ( i = 0; i < length; i++) { |
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182 | dest[i] = dataByte; |
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183 | dataByte = _M3SD_getByte(); |
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184 | } |
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185 | // dataByte will contain the last piece of the response |
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186 | |
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187 | // Send 16 more clocks, 8 more than the delay required between a response and the next command |
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188 | i = _M3SD_getByte(); |
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189 | i = _M3SD_getByte(); |
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190 | |
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191 | // Shift response so that the bytes are correctly aligned |
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192 | // The register may not contain properly aligned data |
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193 | for (shiftAmount = 0; ((dest[0] << shiftAmount) & 0x80) != 0x00; shiftAmount++) { |
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194 | if (shiftAmount >= 7) { |
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195 | return false; |
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196 | } |
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197 | } |
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198 | |
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199 | for (i = 0; i < length - 1; i++) { |
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200 | dest[i] = (dest[i] << shiftAmount) | (dest[i+1] >> (8-shiftAmount)); |
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201 | } |
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202 | // Get the last piece of the response from dataByte |
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203 | dest[i] = (dest[i] << shiftAmount) | (dataByte >> (8-shiftAmount)); |
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204 | |
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205 | return true; |
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206 | } |
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207 | |
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208 | |
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209 | static inline bool _M3SD_getResponse_R1 (u8* dest) { |
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210 | return _M3SD_getResponse (dest, 6); |
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211 | } |
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212 | |
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213 | static inline bool _M3SD_getResponse_R1b (u8* dest) { |
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214 | return _M3SD_getResponse (dest, 6); |
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215 | } |
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216 | |
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217 | static inline bool _M3SD_getResponse_R2 (u8* dest) { |
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218 | return _M3SD_getResponse (dest, 17); |
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219 | } |
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220 | |
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221 | static inline bool _M3SD_getResponse_R3 (u8* dest) { |
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222 | return _M3SD_getResponse (dest, 6); |
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223 | } |
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224 | |
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225 | static inline bool _M3SD_getResponse_R6 (u8* dest) { |
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226 | return _M3SD_getResponse (dest, 6); |
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227 | } |
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228 | |
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229 | static void _M3SD_sendClocks (u32 numClocks) { |
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230 | while (numClocks--) { |
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231 | _M3SD_sendByte(0xff); |
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232 | } |
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233 | } |
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234 | |
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235 | static void _M3SD_getClocks (u32 numClocks) { |
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236 | while (numClocks--) { |
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237 | _M3SD_getByte(); |
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238 | } |
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239 | } |
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240 | |
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241 | static bool _M3SD_cmd_6byte_response (u8* responseBuffer, u8 command, u32 data) { |
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242 | _M3SD_sendCommand (command, data); |
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243 | return _M3SD_getResponse (responseBuffer, 6); |
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244 | } |
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245 | |
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246 | static bool _M3SD_cmd_17byte_response (u8* responseBuffer, u8 command, u32 data) { |
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247 | _M3SD_sendCommand (command, data); |
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248 | return _M3SD_getResponse (responseBuffer, 17); |
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249 | } |
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250 | |
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251 | static bool _M3SD_initCard (void) { |
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252 | // Give the card time to stabilise |
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253 | _M3SD_sendClocks (NUM_STARTUP_CLOCKS); |
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254 | |
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255 | // Reset the card |
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256 | if (!_M3SD_sendCommand (GO_IDLE_STATE, 0)) { |
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257 | return false; |
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258 | } |
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259 | |
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260 | _M3SD_getClocks (NUM_STARTUP_CLOCKS); |
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261 | |
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262 | // Card is now reset, including it's address |
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263 | _M3SD_relativeCardAddress = 0; |
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264 | |
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265 | // Init the card |
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266 | return _SD_InitCard (_M3SD_cmd_6byte_response, |
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267 | _M3SD_cmd_17byte_response, |
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268 | true, |
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269 | &_M3SD_relativeCardAddress); |
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270 | } |
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271 | |
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272 | static bool _M3SD_readData (void* buffer) { |
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273 | u32 i; |
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274 | u8* buff_u8 = (u8*)buffer; |
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275 | u16* buff = (u16*)buffer; |
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276 | u16 temp; |
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277 | |
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278 | REG_M3SD_DIR = 0x49; |
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279 | if (!_M3SD_waitForDataReady()) { |
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280 | REG_M3SD_DIR = 0x09; |
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281 | return false; |
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282 | } |
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283 | REG_M3SD_DIR = 0x09; |
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284 | |
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285 | REG_M3SD_DIR = 0x8; |
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286 | REG_M3SD_STS = 0x4; |
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287 | |
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288 | i = REG_M3SD_DIR; |
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289 | // Read data |
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290 | i=256; |
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291 | if ((u32)buff_u8 & 0x01) { |
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292 | while(i--) |
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293 | { |
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294 | temp = REG_M3SD_DIR; |
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295 | *buff_u8++ = temp & 0xFF; |
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296 | *buff_u8++ = temp >> 8; |
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297 | } |
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298 | } else { |
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299 | while(i--) |
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300 | *buff++ = REG_M3SD_DIR; |
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301 | } |
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302 | // Read end checksum |
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303 | i = REG_M3SD_DIR + REG_M3SD_DIR + REG_M3SD_DIR + REG_M3SD_DIR; |
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304 | |
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305 | return true; |
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306 | } |
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307 | |
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308 | static void _M3SD_clkout (void) { |
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309 | REG_M3SD_DIR = 0x4; |
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310 | REG_M3SD_DIR = 0xc; |
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311 | /* __asm volatile ( |
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312 | "ldr r1, =0x08800000 \n" |
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313 | "mov r0, #0x04 \n" |
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314 | "strh r0, [r1] \n" |
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315 | "mov r0, r0 \n" |
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316 | "mov r0, r0 \n" |
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317 | "mov r0, #0x0c \n" |
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318 | "strh r0, [r1] \n" |
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319 | : // Outputs |
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320 | : // Inputs |
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321 | : "r0", "r1" // Clobber list |
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322 | );*/ |
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323 | } |
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324 | |
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325 | static void _M3SD_clkin (void) { |
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326 | REG_M3SD_DIR = 0x0; |
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327 | REG_M3SD_DIR = 0x8; |
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328 | /* __asm volatile ( |
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329 | "ldr r1, =0x08800000 \n" |
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330 | "mov r0, #0x00 \n" |
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331 | "strh r0, [r1] \n" |
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332 | "mov r0, r0 \n" |
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333 | "mov r0, r0 \n" |
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334 | "mov r0, #0x08 \n" |
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335 | "strh r0, [r1] \n" |
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336 | : // Outputs |
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337 | : // Inputs |
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338 | : "r0", "r1" // Clobber list |
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339 | );*/ |
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340 | } |
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341 | |
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342 | static bool _M3SD_writeData (u8* data, u8* crc) { |
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343 | int i; |
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344 | u8 temp; |
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345 | |
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346 | do { |
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347 | _M3SD_clkin(); |
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348 | } while ((REG_M3SD_DAT & 0x100) == 0); |
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349 | |
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350 | REG_M3SD_DAT = 0; // Start bit |
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351 | |
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352 | _M3SD_clkout(); |
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353 | |
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354 | for (i = 0; i < BYTES_PER_READ; i++) { |
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355 | temp = (*data++); |
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356 | REG_M3SD_DAT = temp >> 4; |
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357 | _M3SD_clkout(); |
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358 | REG_M3SD_DAT = temp; |
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359 | _M3SD_clkout(); |
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360 | } |
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361 | |
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362 | if (crc != NULL) { |
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363 | for (i = 0; i < 8; i++) { |
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364 | temp = (*crc++); |
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365 | REG_M3SD_DAT = temp >> 4; |
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366 | _M3SD_clkout(); |
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367 | REG_M3SD_DAT = temp; |
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368 | _M3SD_clkout(); |
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369 | } |
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370 | } |
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371 | |
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372 | i = 32; |
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373 | while (i--) { |
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374 | temp += 2; // a NOP to stop the compiler optimising out the loop |
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375 | } |
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376 | |
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377 | for (i = 0; i < 32; i++) { |
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378 | REG_M3SD_DAT = 0xff; |
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379 | _M3SD_clkout(); |
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380 | } |
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381 | |
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382 | do { |
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383 | _M3SD_clkin(); |
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384 | } while ((REG_M3SD_DAT & 0x100) == 0); |
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385 | |
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386 | return true; |
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387 | } |
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388 | |
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389 | //--------------------------------------------------------------- |
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390 | // Functions needed for the external interface |
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391 | |
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392 | static bool _M3SD_startUp (void) { |
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393 | _M3SD_unlock(); |
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394 | return _M3SD_initCard(); |
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395 | } |
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396 | |
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397 | static bool _M3SD_isInserted (void) { |
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398 | u8 responseBuffer [6]; |
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399 | // Make sure the card receives the command |
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400 | if (!_M3SD_sendCommand (SEND_STATUS, 0)) { |
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401 | return false; |
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402 | } |
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403 | // Make sure the card responds |
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404 | if (!_M3SD_getResponse_R1 (responseBuffer)) { |
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405 | return false; |
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406 | } |
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407 | // Make sure the card responded correctly |
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408 | if (responseBuffer[0] != SEND_STATUS) { |
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409 | return false; |
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410 | } |
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411 | return true; |
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412 | } |
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413 | |
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414 | static bool _M3SD_readSectors (u32 sector, u32 numSectors, void* buffer) { |
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415 | u32 i; |
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416 | u8* dest = (u8*) buffer; |
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417 | u8 responseBuffer[6]; |
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418 | |
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419 | if (numSectors == 1) { |
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420 | // If it's only reading one sector, use the (slightly faster) READ_SINGLE_BLOCK |
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421 | if (!_M3SD_sendCommand (READ_SINGLE_BLOCK, sector * BYTES_PER_READ)) { |
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422 | return false; |
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423 | } |
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424 | |
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425 | if (!_M3SD_readData (buffer)) { |
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426 | return false; |
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427 | } |
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428 | |
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429 | } else { |
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430 | // Stream the required number of sectors from the card |
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431 | if (!_M3SD_sendCommand (READ_MULTIPLE_BLOCK, sector * BYTES_PER_READ)) { |
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432 | return false; |
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433 | } |
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434 | |
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435 | for(i=0; i < numSectors; i++, dest+=BYTES_PER_READ) { |
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436 | if (!_M3SD_readData(dest)) { |
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437 | return false; |
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438 | } |
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439 | REG_M3SD_STS = 0x8; |
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440 | } |
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441 | |
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442 | // Stop the streaming |
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443 | _M3SD_sendCommand (STOP_TRANSMISSION, 0); |
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444 | _M3SD_getResponse_R1b (responseBuffer); |
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445 | } |
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446 | |
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447 | return true; |
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448 | } |
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449 | |
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450 | static bool _M3SD_writeSectors (u32 sector, u32 numSectors, const void* buffer) { |
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451 | u8 crc[8]; |
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452 | u8 responseBuffer[6]; |
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453 | u32 offset = sector * BYTES_PER_READ; |
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454 | u8* data = (u8*) buffer; |
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455 | int i; |
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456 | // Precalculate the data CRC |
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457 | _SD_CRC16 ( data, BYTES_PER_READ, crc); |
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458 | |
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459 | while (numSectors--) { |
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460 | // Send a single sector write command |
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461 | _M3SD_sendCommand (WRITE_BLOCK, offset); |
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462 | if (!_M3SD_getResponse_R1 (responseBuffer)) { |
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463 | return false; |
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464 | } |
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465 | |
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466 | REG_M3SD_DIR = 0x4; |
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467 | REG_M3SD_STS = 0x0; |
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468 | |
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469 | // Send the data |
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470 | if (! _M3SD_writeData( data, crc)) { |
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471 | return false; |
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472 | } |
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473 | |
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474 | if (numSectors > 0) { |
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475 | offset += BYTES_PER_READ; |
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476 | data += BYTES_PER_READ; |
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477 | // Calculate the next CRC while waiting for the card to finish writing |
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478 | _SD_CRC16 ( data, BYTES_PER_READ, crc); |
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479 | } |
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480 | |
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481 | // Wait for the card to be ready for the next transfer |
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482 | i = WRITE_TIMEOUT; |
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483 | responseBuffer[3] = 0; |
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484 | do { |
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485 | _M3SD_sendCommand (SEND_STATUS, _M3SD_relativeCardAddress); |
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486 | _M3SD_getResponse_R1 (responseBuffer); |
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487 | i--; |
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488 | if (i <= 0) { |
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489 | return false; |
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490 | } |
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491 | } while (((responseBuffer[3] & 0x1f) != ((SD_STATE_TRAN << 1) | READY_FOR_DATA))); |
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492 | } |
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493 | |
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494 | return true; |
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495 | |
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496 | } |
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497 | |
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498 | static bool _M3SD_clearStatus (void) { |
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499 | return _M3SD_initCard (); |
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500 | } |
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501 | |
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502 | static bool _M3SD_shutdown (void) { |
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503 | _M3_changeMode (M3_MODE_ROM); |
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504 | return true; |
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505 | } |
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506 | |
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507 | const IO_INTERFACE _io_m3sd = { |
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508 | DEVICE_TYPE_M3SD, |
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509 | FEATURE_MEDIUM_CANREAD | FEATURE_MEDIUM_CANWRITE | FEATURE_SLOT_GBA, |
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510 | (FN_MEDIUM_STARTUP)&_M3SD_startUp, |
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511 | (FN_MEDIUM_ISINSERTED)&_M3SD_isInserted, |
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512 | (FN_MEDIUM_READSECTORS)&_M3SD_readSectors, |
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513 | (FN_MEDIUM_WRITESECTORS)&_M3SD_writeSectors, |
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514 | (FN_MEDIUM_CLEARSTATUS)&_M3SD_clearStatus, |
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515 | (FN_MEDIUM_SHUTDOWN)&_M3SD_shutdown |
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516 | } ; |
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517 | |
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518 | |
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