This is SDFileSystem which corrected the bug for MiMicSDK.
Dependents: MbedFileServer_1768MiniDK2 RedWireBridge IssueDebug_gcc MiMicRemoteMCU-for-Mbed ... more
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SDFileSystem.cpp
00001 /* mbed Microcontroller Library 00002 * Copyright (c) 2006-2012 ARM Limited 00003 * 00004 * Permission is hereby granted, free of charge, to any person obtaining a copy 00005 * of this software and associated documentation files (the "Software"), to deal 00006 * in the Software without restriction, including without limitation the rights 00007 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 00008 * copies of the Software, and to permit persons to whom the Software is 00009 * furnished to do so, subject to the following conditions: 00010 * 00011 * The above copyright notice and this permission notice shall be included in 00012 * all copies or substantial portions of the Software. 00013 * 00014 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 00015 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 00016 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 00017 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 00018 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 00019 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 00020 * SOFTWARE. 00021 */ 00022 /* Introduction 00023 * ------------ 00024 * SD and MMC cards support a number of interfaces, but common to them all 00025 * is one based on SPI. This is the one I'm implmenting because it means 00026 * it is much more portable even though not so performant, and we already 00027 * have the mbed SPI Interface! 00028 * 00029 * The main reference I'm using is Chapter 7, "SPI Mode" of: 00030 * http://www.sdcard.org/developers/tech/sdcard/pls/Simplified_Physical_Layer_Spec.pdf 00031 * 00032 * SPI Startup 00033 * ----------- 00034 * The SD card powers up in SD mode. The SPI interface mode is selected by 00035 * asserting CS low and sending the reset command (CMD0). The card will 00036 * respond with a (R1) response. 00037 * 00038 * CMD8 is optionally sent to determine the voltage range supported, and 00039 * indirectly determine whether it is a version 1.x SD/non-SD card or 00040 * version 2.x. I'll just ignore this for now. 00041 * 00042 * ACMD41 is repeatedly issued to initialise the card, until "in idle" 00043 * (bit 0) of the R1 response goes to '0', indicating it is initialised. 00044 * 00045 * You should also indicate whether the host supports High Capicity cards, 00046 * and check whether the card is high capacity - i'll also ignore this 00047 * 00048 * SPI Protocol 00049 * ------------ 00050 * The SD SPI protocol is based on transactions made up of 8-bit words, with 00051 * the host starting every bus transaction by asserting the CS signal low. The 00052 * card always responds to commands, data blocks and errors. 00053 * 00054 * The protocol supports a CRC, but by default it is off (except for the 00055 * first reset CMD0, where the CRC can just be pre-calculated, and CMD8) 00056 * I'll leave the CRC off I think! 00057 * 00058 * Standard capacity cards have variable data block sizes, whereas High 00059 * Capacity cards fix the size of data block to 512 bytes. I'll therefore 00060 * just always use the Standard Capacity cards with a block size of 512 bytes. 00061 * This is set with CMD16. 00062 * 00063 * You can read and write single blocks (CMD17, CMD25) or multiple blocks 00064 * (CMD18, CMD25). For simplicity, I'll just use single block accesses. When 00065 * the card gets a read command, it responds with a response token, and then 00066 * a data token or an error. 00067 * 00068 * SPI Command Format 00069 * ------------------ 00070 * Commands are 6-bytes long, containing the command, 32-bit argument, and CRC. 00071 * 00072 * +---------------+------------+------------+-----------+----------+--------------+ 00073 * | 01 | cmd[5:0] | arg[31:24] | arg[23:16] | arg[15:8] | arg[7:0] | crc[6:0] | 1 | 00074 * +---------------+------------+------------+-----------+----------+--------------+ 00075 * 00076 * As I'm not using CRC, I can fix that byte to what is needed for CMD0 (0x95) 00077 * 00078 * All Application Specific commands shall be preceded with APP_CMD (CMD55). 00079 * 00080 * SPI Response Format 00081 * ------------------- 00082 * The main response format (R1) is a status byte (normally zero). Key flags: 00083 * idle - 1 if the card is in an idle state/initialising 00084 * cmd - 1 if an illegal command code was detected 00085 * 00086 * +-------------------------------------------------+ 00087 * R1 | 0 | arg | addr | seq | crc | cmd | erase | idle | 00088 * +-------------------------------------------------+ 00089 * 00090 * R1b is the same, except it is followed by a busy signal (zeros) until 00091 * the first non-zero byte when it is ready again. 00092 * 00093 * Data Response Token 00094 * ------------------- 00095 * Every data block written to the card is acknowledged by a byte 00096 * response token 00097 * 00098 * +----------------------+ 00099 * | xxx | 0 | status | 1 | 00100 * +----------------------+ 00101 * 010 - OK! 00102 * 101 - CRC Error 00103 * 110 - Write Error 00104 * 00105 * Single Block Read and Write 00106 * --------------------------- 00107 * 00108 * Block transfers have a byte header, followed by the data, followed 00109 * by a 16-bit CRC. In our case, the data will always be 512 bytes. 00110 * 00111 * +------+---------+---------+- - - -+---------+-----------+----------+ 00112 * | 0xFE | data[0] | data[1] | | data[n] | crc[15:8] | crc[7:0] | 00113 * +------+---------+---------+- - - -+---------+-----------+----------+ 00114 */ 00115 #include "SDFileSystem.h" 00116 00117 00118 00119 #define SD_COMMAND_TIMEOUT 5000 00120 00121 #define SD_DBG 0 00122 00123 SDFileSystem::SDFileSystem(PinName mosi, PinName miso, PinName sclk, PinName cs, const char* name) : 00124 FATFileSystem(name), _spi(mosi, miso, sclk), _cs(cs) { 00125 _cs = 1; 00126 } 00127 00128 #define R1_IDLE_STATE (1 << 0) 00129 #define R1_ERASE_RESET (1 << 1) 00130 #define R1_ILLEGAL_COMMAND (1 << 2) 00131 #define R1_COM_CRC_ERROR (1 << 3) 00132 #define R1_ERASE_SEQUENCE_ERROR (1 << 4) 00133 #define R1_ADDRESS_ERROR (1 << 5) 00134 #define R1_PARAMETER_ERROR (1 << 6) 00135 00136 // Types 00137 // - v1.x Standard Capacity 00138 // - v2.x Standard Capacity 00139 // - v2.x High Capacity 00140 // - Not recognised as an SD Card 00141 #define SDCARD_FAIL 0 00142 #define SDCARD_V1 1 00143 #define SDCARD_V2 2 00144 #define SDCARD_V2HC 3 00145 00146 int SDFileSystem::initialise_card() { 00147 00148 // Set to 100kHz for initialisation, and clock card with cs = 1 00149 _spi.frequency(100000); 00150 _cs = 1; 00151 for (int i = 0; i < 16; i++) { 00152 _spi.write(0xFF); 00153 } 00154 00155 // send CMD0, should return with all zeros except IDLE STATE set (bit 0) 00156 if (_cmd(0, 0) != R1_IDLE_STATE) { 00157 return SDCARD_FAIL; 00158 } 00159 00160 // send CMD8 to determine whther it is ver 2.x 00161 int r = _cmd8(); 00162 if (r == R1_IDLE_STATE) { 00163 return initialise_card_v2(); 00164 } else if (r == (R1_IDLE_STATE | R1_ILLEGAL_COMMAND)) { 00165 return initialise_card_v1(); 00166 } else { 00167 return SDCARD_FAIL; 00168 } 00169 } 00170 00171 int SDFileSystem::initialise_card_v1() { 00172 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) { 00173 _cmd(55, 0); 00174 if (_cmd(41, 0) == 0) { 00175 cdv = 512; 00176 return SDCARD_V1; 00177 } 00178 } 00179 00180 return SDCARD_FAIL; 00181 } 00182 00183 int SDFileSystem::initialise_card_v2() { 00184 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) { 00185 wait_ms(50); 00186 _cmd58(); 00187 _cmd(55, 0); 00188 if (_cmd(41, 0x40000000) == 0) { 00189 _cmd58(); 00190 cdv = 1; 00191 return SDCARD_V2; 00192 } 00193 } 00194 00195 return SDCARD_FAIL; 00196 } 00197 00198 int SDFileSystem::disk_initialize() { 00199 int i = initialise_card(); 00200 if(i==SDCARD_FAIL){ 00201 return 1; 00202 } 00203 _sectors = _sd_sectors(); 00204 00205 // Set block length to 512 (CMD16) 00206 if (_cmd(16, 512) != 0) { 00207 return 1; 00208 } 00209 00210 _spi.frequency(1000000); // Set to 1MHz for data transfer 00211 return 0; 00212 } 00213 00214 int SDFileSystem::disk_write(const uint8_t *buffer, uint64_t block_number) { 00215 // set write address for single block (CMD24) 00216 if (_cmd(24, block_number * cdv) != 0) { 00217 return 1; 00218 } 00219 00220 // send the data block 00221 _write(buffer, 512); 00222 return 0; 00223 } 00224 00225 int SDFileSystem::disk_read(uint8_t *buffer, uint64_t block_number) { 00226 // set read address for single block (CMD17) 00227 if (_cmd(17, block_number * cdv) != 0) { 00228 return 1; 00229 } 00230 00231 // receive the data 00232 _read(buffer, 512); 00233 return 0; 00234 } 00235 00236 int SDFileSystem::disk_status() { return 0; } 00237 int SDFileSystem::disk_sync() { return 0; } 00238 uint64_t SDFileSystem::disk_sectors() { return _sectors; } 00239 00240 00241 // PRIVATE FUNCTIONS 00242 int SDFileSystem::_cmd(int cmd, int arg) { 00243 _cs = 0; 00244 00245 // send a command 00246 _spi.write(0x40 | cmd); 00247 _spi.write(arg >> 24); 00248 _spi.write(arg >> 16); 00249 _spi.write(arg >> 8); 00250 _spi.write(arg >> 0); 00251 _spi.write(0x95); 00252 00253 // wait for the repsonse (response[7] == 0) 00254 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) { 00255 int response = _spi.write(0xFF); 00256 if (!(response & 0x80)) { 00257 _cs = 1; 00258 _spi.write(0xFF); 00259 return response; 00260 } 00261 } 00262 _cs = 1; 00263 _spi.write(0xFF); 00264 return -1; // timeout 00265 } 00266 int SDFileSystem::_cmdx(int cmd, int arg) { 00267 _cs = 0; 00268 00269 // send a command 00270 _spi.write(0x40 | cmd); 00271 _spi.write(arg >> 24); 00272 _spi.write(arg >> 16); 00273 _spi.write(arg >> 8); 00274 _spi.write(arg >> 0); 00275 _spi.write(0x95); 00276 00277 // wait for the repsonse (response[7] == 0) 00278 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) { 00279 int response = _spi.write(0xFF); 00280 if (!(response & 0x80)) { 00281 return response; 00282 } 00283 } 00284 _cs = 1; 00285 _spi.write(0xFF); 00286 return -1; // timeout 00287 } 00288 00289 00290 int SDFileSystem::_cmd58() { 00291 _cs = 0; 00292 int arg = 0; 00293 00294 // send a command 00295 _spi.write(0x40 | 58); 00296 _spi.write(arg >> 24); 00297 _spi.write(arg >> 16); 00298 _spi.write(arg >> 8); 00299 _spi.write(arg >> 0); 00300 _spi.write(0x95); 00301 00302 // wait for the repsonse (response[7] == 0) 00303 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) { 00304 int response = _spi.write(0xFF); 00305 if (!(response & 0x80)) { 00306 int ocr = _spi.write(0xFF) << 24; 00307 ocr |= _spi.write(0xFF) << 16; 00308 ocr |= _spi.write(0xFF) << 8; 00309 ocr |= _spi.write(0xFF) << 0; 00310 _cs = 1; 00311 _spi.write(0xFF); 00312 return response; 00313 } 00314 } 00315 _cs = 1; 00316 _spi.write(0xFF); 00317 return -1; // timeout 00318 } 00319 00320 int SDFileSystem::_cmd8() { 00321 _cs = 0; 00322 00323 // send a command 00324 _spi.write(0x40 | 8); // CMD8 00325 _spi.write(0x00); // reserved 00326 _spi.write(0x00); // reserved 00327 _spi.write(0x01); // 3.3v 00328 _spi.write(0xAA); // check pattern 00329 _spi.write(0x87); // crc 00330 00331 // wait for the repsonse (response[7] == 0) 00332 for (int i = 0; i < SD_COMMAND_TIMEOUT * 1000; i++) { 00333 char response[5]; 00334 response[0] = _spi.write(0xFF); 00335 if (!(response[0] & 0x80)) { 00336 for (int j = 1; j < 5; j++) { 00337 response[i] = _spi.write(0xFF); 00338 } 00339 _cs = 1; 00340 _spi.write(0xFF); 00341 return response[0]; 00342 } 00343 } 00344 _cs = 1; 00345 _spi.write(0xFF); 00346 return -1; // timeout 00347 } 00348 00349 int SDFileSystem::_read(uint8_t *buffer, uint32_t length) { 00350 _cs = 0; 00351 00352 // read until start byte (0xFF) 00353 while (_spi.write(0xFF) != 0xFE); 00354 00355 // read data 00356 for (uint32_t i = 0; i < length; i++) { 00357 buffer[i] = _spi.write(0xFF); 00358 } 00359 _spi.write(0xFF); // checksum 00360 _spi.write(0xFF); 00361 00362 _cs = 1; 00363 _spi.write(0xFF); 00364 return 0; 00365 } 00366 00367 int SDFileSystem::_write(const uint8_t*buffer, uint32_t length) { 00368 _cs = 0; 00369 00370 // indicate start of block 00371 _spi.write(0xFE); 00372 00373 // write the data 00374 for (uint32_t i = 0; i < length; i++) { 00375 _spi.write(buffer[i]); 00376 } 00377 00378 // write the checksum 00379 _spi.write(0xFF); 00380 _spi.write(0xFF); 00381 00382 // check the response token 00383 if ((_spi.write(0xFF) & 0x1F) != 0x05) { 00384 _cs = 1; 00385 _spi.write(0xFF); 00386 return 1; 00387 } 00388 00389 // wait for write to finish 00390 while (_spi.write(0xFF) == 0); 00391 00392 _cs = 1; 00393 _spi.write(0xFF); 00394 return 0; 00395 } 00396 00397 static uint32_t ext_bits(unsigned char *data, int msb, int lsb) { 00398 uint32_t bits = 0; 00399 uint32_t size = 1 + msb - lsb; 00400 for (uint32_t i = 0; i < size; i++) { 00401 uint32_t position = lsb + i; 00402 uint32_t byte = 15 - (position >> 3); 00403 uint32_t bit = position & 0x7; 00404 uint32_t value = (data[byte] >> bit) & 1; 00405 bits |= value << i; 00406 } 00407 return bits; 00408 } 00409 00410 uint64_t SDFileSystem::_sd_sectors() { 00411 uint32_t c_size, c_size_mult, read_bl_len; 00412 uint32_t block_len, mult, blocknr, capacity; 00413 uint32_t hc_c_size; 00414 uint64_t blocks; 00415 00416 // CMD9, Response R2 (R1 byte + 16-byte block read) 00417 if (_cmdx(9, 0) != 0) { 00418 return 0; 00419 } 00420 00421 uint8_t csd[16]; 00422 if (_read(csd, 16) != 0) { 00423 return 0; 00424 } 00425 00426 // csd_structure : csd[127:126] 00427 // c_size : csd[73:62] 00428 // c_size_mult : csd[49:47] 00429 // read_bl_len : csd[83:80] - the *maximum* read block length 00430 00431 int csd_structure = ext_bits(csd, 127, 126); 00432 00433 switch (csd_structure) { 00434 case 0: 00435 cdv = 512; 00436 c_size = ext_bits(csd, 73, 62); 00437 c_size_mult = ext_bits(csd, 49, 47); 00438 read_bl_len = ext_bits(csd, 83, 80); 00439 00440 block_len = 1 << read_bl_len; 00441 mult = 1 << (c_size_mult + 2); 00442 blocknr = (c_size + 1) * mult; 00443 capacity = blocknr * block_len; 00444 blocks = capacity / 512; 00445 break; 00446 00447 case 1: 00448 cdv = 1; 00449 hc_c_size = ext_bits(csd, 63, 48); 00450 blocks = (hc_c_size+1)*1024; 00451 break; 00452 00453 default: 00454 return 0; 00455 }; 00456 return blocks; 00457 }
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