Natthakorn Meechai / SDFileSystem

5

Dependencies:   FATFileSystem

SDFileSystem.cpp@0:7cd1533897a3, 2018-12-16 (annotated)

Committer:
Marknaja
Date:
Sun Dec 16 02:05:32 2018 +0000
Revision:
0:7cd1533897a3
88

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Marknaja 0:7cd1533897a3 1 /* mbed Microcontroller Library
Marknaja 0:7cd1533897a3 2 * Copyright (c) 2006-2012 ARM Limited
Marknaja 0:7cd1533897a3 3 *
Marknaja 0:7cd1533897a3 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
Marknaja 0:7cd1533897a3 5 * of this software and associated documentation files (the "Software"), to deal
Marknaja 0:7cd1533897a3 6 * in the Software without restriction, including without limitation the rights
Marknaja 0:7cd1533897a3 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
Marknaja 0:7cd1533897a3 8 * copies of the Software, and to permit persons to whom the Software is
Marknaja 0:7cd1533897a3 9 * furnished to do so, subject to the following conditions:
Marknaja 0:7cd1533897a3 10 *
Marknaja 0:7cd1533897a3 11 * The above copyright notice and this permission notice shall be included in
Marknaja 0:7cd1533897a3 12 * all copies or substantial portions of the Software.
Marknaja 0:7cd1533897a3 13 *
Marknaja 0:7cd1533897a3 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
Marknaja 0:7cd1533897a3 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
Marknaja 0:7cd1533897a3 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
Marknaja 0:7cd1533897a3 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
Marknaja 0:7cd1533897a3 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
Marknaja 0:7cd1533897a3 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
Marknaja 0:7cd1533897a3 20 * SOFTWARE.
Marknaja 0:7cd1533897a3 21 */
Marknaja 0:7cd1533897a3 22
Marknaja 0:7cd1533897a3 23 /* Introduction
Marknaja 0:7cd1533897a3 24 * ------------
Marknaja 0:7cd1533897a3 25 * SD and MMC cards support a number of interfaces, but common to them all
Marknaja 0:7cd1533897a3 26 * is one based on SPI. This is the one I'm implmenting because it means
Marknaja 0:7cd1533897a3 27 * it is much more portable even though not so performant, and we already
Marknaja 0:7cd1533897a3 28 * have the mbed SPI Interface!
Marknaja 0:7cd1533897a3 29 *
Marknaja 0:7cd1533897a3 30 * The main reference I'm using is Chapter 7, "SPI Mode" of:
Marknaja 0:7cd1533897a3 31 * http://www.sdcard.org/developers/tech/sdcard/pls/Simplified_Physical_Layer_Spec.pdf
Marknaja 0:7cd1533897a3 32 *
Marknaja 0:7cd1533897a3 33 * SPI Startup
Marknaja 0:7cd1533897a3 34 * -----------
Marknaja 0:7cd1533897a3 35 * The SD card powers up in SD mode. The
Marknaja 0:7cd1533897a3 36
Marknaja 0:7cd1533897a3 37 interface mode is selected by
Marknaja 0:7cd1533897a3 38 * asserting CS low and sending the reset command (CMD0). The card will
Marknaja 0:7cd1533897a3 39 * respond with a (R1) response.
Marknaja 0:7cd1533897a3 40 *
Marknaja 0:7cd1533897a3 41 * CMD8 is optionally sent to determine the voltage range supported, and
Marknaja 0:7cd1533897a3 42 * indirectly determine whether it is a version 1.x SD/non-SD card or
Marknaja 0:7cd1533897a3 43 * version 2.x. I'll just ignore this for now.
Marknaja 0:7cd1533897a3 44 *
Marknaja 0:7cd1533897a3 45 * ACMD41 is repeatedly issued to initialise the card, until "in idle"
Marknaja 0:7cd1533897a3 46 * (bit 0) of the R1 response goes to '0', indicating it is initialised.
Marknaja 0:7cd1533897a3 47 *
Marknaja 0:7cd1533897a3 48 * You should also indicate whether the host supports High Capicity cards,
Marknaja 0:7cd1533897a3 49 * and check whether the card is high capacity - i'll also ignore this
Marknaja 0:7cd1533897a3 50 *
Marknaja 0:7cd1533897a3 51 * SPI Protocol
Marknaja 0:7cd1533897a3 52 * ------------
Marknaja 0:7cd1533897a3 53 * The SD SPI protocol is based on transactions made up of 8-bit words, with
Marknaja 0:7cd1533897a3 54 * the host starting every bus transaction by asserting the CS signal low. The
Marknaja 0:7cd1533897a3 55 * card always responds to commands, data blocks and errors.
Marknaja 0:7cd1533897a3 56 *
Marknaja 0:7cd1533897a3 57 * The protocol supports a CRC, but by default it is off (except for the
Marknaja 0:7cd1533897a3 58 * first reset CMD0, where the CRC can just be pre-calculated, and CMD8)
Marknaja 0:7cd1533897a3 59 * I'll leave the CRC off I think!
Marknaja 0:7cd1533897a3 60 *
Marknaja 0:7cd1533897a3 61 * Standard capacity cards have variable data block sizes, whereas High
Marknaja 0:7cd1533897a3 62 * Capacity cards fix the size of data block to 512 bytes. I'll therefore
Marknaja 0:7cd1533897a3 63 * just always use the Standard Capacity cards with a block size of 512 bytes.
Marknaja 0:7cd1533897a3 64 * This is set with CMD16.
Marknaja 0:7cd1533897a3 65 *
Marknaja 0:7cd1533897a3 66 * You can read and write single blocks (CMD17, CMD25) or multiple blocks
Marknaja 0:7cd1533897a3 67 * (CMD18, CMD25). For simplicity, I'll just use single block accesses. When
Marknaja 0:7cd1533897a3 68 * the card gets a read command, it responds with a response token, and then
Marknaja 0:7cd1533897a3 69 * a data token or an error.
Marknaja 0:7cd1533897a3 70 *
Marknaja 0:7cd1533897a3 71 * SPI Command Format
Marknaja 0:7cd1533897a3 72 * ------------------
Marknaja 0:7cd1533897a3 73 * Commands are 6-bytes long, containing the command, 32-bit argument, and CRC.
Marknaja 0:7cd1533897a3 74 *
Marknaja 0:7cd1533897a3 75 * +---------------+------------+------------+-----------+----------+--------------+
Marknaja 0:7cd1533897a3 76 * | 01 | cmd[5:0] | arg[31:24] | arg[23:16] | arg[15:8] | arg[7:0] | crc[6:0] | 1 |
Marknaja 0:7cd1533897a3 77 * +---------------+------------+------------+-----------+----------+--------------+
Marknaja 0:7cd1533897a3 78 *
Marknaja 0:7cd1533897a3 79 * As I'm not using CRC, I can fix that byte to what is needed for CMD0 (0x95)
Marknaja 0:7cd1533897a3 80 *
Marknaja 0:7cd1533897a3 81 * All Application Specific commands shall be preceded with APP_CMD (CMD55).
Marknaja 0:7cd1533897a3 82 *
Marknaja 0:7cd1533897a3 83 * SPI Response Format
Marknaja 0:7cd1533897a3 84 * -------------------
Marknaja 0:7cd1533897a3 85 * The main response format (R1) is a status byte (normally zero). Key flags:
Marknaja 0:7cd1533897a3 86 * idle - 1 if the card is in an idle state/initialising
Marknaja 0:7cd1533897a3 87 * cmd - 1 if an illegal command code was detected
Marknaja 0:7cd1533897a3 88 *
Marknaja 0:7cd1533897a3 89 * +-------------------------------------------------+
Marknaja 0:7cd1533897a3 90 * R1 | 0 | arg | addr | seq | crc | cmd | erase | idle |
Marknaja 0:7cd1533897a3 91 * +-------------------------------------------------+
Marknaja 0:7cd1533897a3 92 *
Marknaja 0:7cd1533897a3 93 * R1b is the same, except it is followed by a busy signal (zeros) until
Marknaja 0:7cd1533897a3 94 * the first non-zero byte when it is ready again.
Marknaja 0:7cd1533897a3 95 *
Marknaja 0:7cd1533897a3 96 * Data Response Token
Marknaja 0:7cd1533897a3 97 * -------------------
Marknaja 0:7cd1533897a3 98 * Every data block written to the card is acknowledged by a byte
Marknaja 0:7cd1533897a3 99 * response token
Marknaja 0:7cd1533897a3 100 *
Marknaja 0:7cd1533897a3 101 * +----------------------+
Marknaja 0:7cd1533897a3 102 * | xxx | 0 | status | 1 |
Marknaja 0:7cd1533897a3 103 * +----------------------+
Marknaja 0:7cd1533897a3 104 * 010 - OK!
Marknaja 0:7cd1533897a3 105 * 101 - CRC Error
Marknaja 0:7cd1533897a3 106 * 110 - Write Error
Marknaja 0:7cd1533897a3 107 *
Marknaja 0:7cd1533897a3 108 * Single Block Read and Write
Marknaja 0:7cd1533897a3 109 * ---------------------------
Marknaja 0:7cd1533897a3 110 *
Marknaja 0:7cd1533897a3 111 * Block transfers have a byte header, followed by the data, followed
Marknaja 0:7cd1533897a3 112 * by a 16-bit CRC. In our case, the data will always be 512 bytes.
Marknaja 0:7cd1533897a3 113 *
Marknaja 0:7cd1533897a3 114 * +------+---------+---------+- - - -+---------+-----------+----------+
Marknaja 0:7cd1533897a3 115 * | 0xFE | data[0] | data[1] | | data[n] | crc[15:8] | crc[7:0] |
Marknaja 0:7cd1533897a3 116 * +------+---------+---------+- - - -+---------+-----------+----------+
Marknaja 0:7cd1533897a3 117 */
Marknaja 0:7cd1533897a3 118 #include "SDFileSystem.h"
Marknaja 0:7cd1533897a3 119 #include "mbed_debug.h"
Marknaja 0:7cd1533897a3 120
Marknaja 0:7cd1533897a3 121 #define SD_COMMAND_TIMEOUT 5000
Marknaja 0:7cd1533897a3 122
Marknaja 0:7cd1533897a3 123 #define SD_DBG 0
Marknaja 0:7cd1533897a3 124
Marknaja 0:7cd1533897a3 125 SDFileSystem::SDFileSystem(PinName mosi, PinName miso, PinName sclk, PinName cs, const char* name) :
Marknaja 0:7cd1533897a3 126 FATFileSystem(name), _spi(mosi, miso, sclk), _cs(cs) {
Marknaja 0:7cd1533897a3 127 _cs = 1;
Marknaja 0:7cd1533897a3 128 }
Marknaja 0:7cd1533897a3 129
Marknaja 0:7cd1533897a3 130 #define R1_IDLE_STATE (1 << 0)
Marknaja 0:7cd1533897a3 131 #define R1_ERASE_RESET (1 << 1)
Marknaja 0:7cd1533897a3 132 #define R1_ILLEGAL_COMMAND (1 << 2)
Marknaja 0:7cd1533897a3 133 #define R1_COM_CRC_ERROR (1 << 3)
Marknaja 0:7cd1533897a3 134 #define R1_ERASE_SEQUENCE_ERROR (1 << 4)
Marknaja 0:7cd1533897a3 135 #define R1_ADDRESS_ERROR (1 << 5)
Marknaja 0:7cd1533897a3 136 #define R1_PARAMETER_ERROR (1 << 6)
Marknaja 0:7cd1533897a3 137
Marknaja 0:7cd1533897a3 138 // Types
Marknaja 0:7cd1533897a3 139 #define SDCARD_FAIL 0 //!< v1.x Standard Capacity
Marknaja 0:7cd1533897a3 140 #define SDCARD_V1 1 //!< v2.x Standard Capacity
Marknaja 0:7cd1533897a3 141 #define SDCARD_V2 2 //!< v2.x High Capacity
Marknaja 0:7cd1533897a3 142 #define SDCARD_V2HC 3 //!< Not recognised as an SD Card
Marknaja 0:7cd1533897a3 143
Marknaja 0:7cd1533897a3 144 int SDFileSystem::initialise_card() {
Marknaja 0:7cd1533897a3 145 // Set to 100kHz for initialisation, and clock card with cs = 1
Marknaja 0:7cd1533897a3 146 _spi.frequency(100000);
Marknaja 0:7cd1533897a3 147 _cs = 1;
Marknaja 0:7cd1533897a3 148 for (int i = 0; i < 16; i++) {
Marknaja 0:7cd1533897a3 149 _spi.write(0xFF);
Marknaja 0:7cd1533897a3 150 }
Marknaja 0:7cd1533897a3 151
Marknaja 0:7cd1533897a3 152 // send CMD0, should return with all zeros except IDLE STATE set (bit 0)
Marknaja 0:7cd1533897a3 153 if (_cmd(0, 0) != R1_IDLE_STATE) {
Marknaja 0:7cd1533897a3 154 debug("No disk, or could not put SD card in to SPI idle state\n");
Marknaja 0:7cd1533897a3 155 return SDCARD_FAIL;
Marknaja 0:7cd1533897a3 156 }
Marknaja 0:7cd1533897a3 157
Marknaja 0:7cd1533897a3 158 // send CMD8 to determine whther it is ver 2.x
Marknaja 0:7cd1533897a3 159 int r = _cmd8();
Marknaja 0:7cd1533897a3 160 if (r == R1_IDLE_STATE) {
Marknaja 0:7cd1533897a3 161 return initialise_card_v2();
Marknaja 0:7cd1533897a3 162 } else if (r == (R1_IDLE_STATE | R1_ILLEGAL_COMMAND)) {
Marknaja 0:7cd1533897a3 163 return initialise_card_v1();
Marknaja 0:7cd1533897a3 164 } else {
Marknaja 0:7cd1533897a3 165 debug("Not in idle state after sending CMD8 (not an SD card?)\n");
Marknaja 0:7cd1533897a3 166 return SDCARD_FAIL;
Marknaja 0:7cd1533897a3 167 }
Marknaja 0:7cd1533897a3 168 }
Marknaja 0:7cd1533897a3 169
Marknaja 0:7cd1533897a3 170 int SDFileSystem::initialise_card_v1() {
Marknaja 0:7cd1533897a3 171 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
Marknaja 0:7cd1533897a3 172 _cmd(55, 0);
Marknaja 0:7cd1533897a3 173 if (_cmd(41, 0) == 0) {
Marknaja 0:7cd1533897a3 174 cdv = 512;
Marknaja 0:7cd1533897a3 175 debug_if(SD_DBG, "\n\rInit: SEDCARD_V1\n\r");
Marknaja 0:7cd1533897a3 176 return SDCARD_V1;
Marknaja 0:7cd1533897a3 177 }
Marknaja 0:7cd1533897a3 178 }
Marknaja 0:7cd1533897a3 179
Marknaja 0:7cd1533897a3 180 debug("Timeout waiting for v1.x card\n");
Marknaja 0:7cd1533897a3 181 return SDCARD_FAIL;
Marknaja 0:7cd1533897a3 182 }
Marknaja 0:7cd1533897a3 183
Marknaja 0:7cd1533897a3 184 int SDFileSystem::initialise_card_v2() {
Marknaja 0:7cd1533897a3 185 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
Marknaja 0:7cd1533897a3 186 wait_ms(50);
Marknaja 0:7cd1533897a3 187 _cmd58();
Marknaja 0:7cd1533897a3 188 _cmd(55, 0);
Marknaja 0:7cd1533897a3 189 if (_cmd(41, 0x40000000) == 0) {
Marknaja 0:7cd1533897a3 190 _cmd58();
Marknaja 0:7cd1533897a3 191 debug_if(SD_DBG, "\n\rInit: SDCARD_V2\n\r");
Marknaja 0:7cd1533897a3 192 cdv = 1;
Marknaja 0:7cd1533897a3 193 return SDCARD_V2;
Marknaja 0:7cd1533897a3 194 }
Marknaja 0:7cd1533897a3 195 }
Marknaja 0:7cd1533897a3 196
Marknaja 0:7cd1533897a3 197 debug("Timeout waiting for v2.x card\n");
Marknaja 0:7cd1533897a3 198 return SDCARD_FAIL;
Marknaja 0:7cd1533897a3 199 }
Marknaja 0:7cd1533897a3 200
Marknaja 0:7cd1533897a3 201 int SDFileSystem::disk_initialize() {
Marknaja 0:7cd1533897a3 202 int i = initialise_card();
Marknaja 0:7cd1533897a3 203 debug_if(SD_DBG, "init card = %d\n", i);
Marknaja 0:7cd1533897a3 204 _sectors = _sd_sectors();
Marknaja 0:7cd1533897a3 205
Marknaja 0:7cd1533897a3 206 // Set block length to 512 (CMD16)
Marknaja 0:7cd1533897a3 207 if (_cmd(16, 512) != 0) {
Marknaja 0:7cd1533897a3 208 debug("Set 512-byte block timed out\n");
Marknaja 0:7cd1533897a3 209 return 1;
Marknaja 0:7cd1533897a3 210 }
Marknaja 0:7cd1533897a3 211
Marknaja 0:7cd1533897a3 212 _spi.frequency(12000000); // Set to 12MHz for data transfer
Marknaja 0:7cd1533897a3 213 return 0;
Marknaja 0:7cd1533897a3 214 }
Marknaja 0:7cd1533897a3 215
Marknaja 0:7cd1533897a3 216 int SDFileSystem::disk_write(const uint8_t *buffer, uint64_t block_number) {
Marknaja 0:7cd1533897a3 217 // set write address for single block (CMD24)
Marknaja 0:7cd1533897a3 218 if (_cmd(24, block_number * cdv) != 0) {
Marknaja 0:7cd1533897a3 219 return 1;
Marknaja 0:7cd1533897a3 220 }
Marknaja 0:7cd1533897a3 221
Marknaja 0:7cd1533897a3 222 // send the data block
Marknaja 0:7cd1533897a3 223 _write(buffer, 512);
Marknaja 0:7cd1533897a3 224 return 0;
Marknaja 0:7cd1533897a3 225 }
Marknaja 0:7cd1533897a3 226
Marknaja 0:7cd1533897a3 227 int SDFileSystem::disk_read(uint8_t *buffer, uint64_t block_number) {
Marknaja 0:7cd1533897a3 228 // set read address for single block (CMD17)
Marknaja 0:7cd1533897a3 229 if (_cmd(17, block_number * cdv) != 0) {
Marknaja 0:7cd1533897a3 230 return 1;
Marknaja 0:7cd1533897a3 231 }
Marknaja 0:7cd1533897a3 232
Marknaja 0:7cd1533897a3 233 // receive the data
Marknaja 0:7cd1533897a3 234 _read(buffer, 512);
Marknaja 0:7cd1533897a3 235 return 0;
Marknaja 0:7cd1533897a3 236 }
Marknaja 0:7cd1533897a3 237
Marknaja 0:7cd1533897a3 238 int SDFileSystem::disk_status() { return 0; }
Marknaja 0:7cd1533897a3 239 int SDFileSystem::disk_sync() { return 0; }
Marknaja 0:7cd1533897a3 240 uint64_t SDFileSystem::disk_sectors() { return _sectors; }
Marknaja 0:7cd1533897a3 241
Marknaja 0:7cd1533897a3 242
Marknaja 0:7cd1533897a3 243 // PRIVATE FUNCTIONS
Marknaja 0:7cd1533897a3 244 int SDFileSystem::_cmd(int cmd, int arg) {
Marknaja 0:7cd1533897a3 245 _cs = 0;
Marknaja 0:7cd1533897a3 246
Marknaja 0:7cd1533897a3 247 // send a command
Marknaja 0:7cd1533897a3 248 _spi.write(0x40 | cmd);
Marknaja 0:7cd1533897a3 249 _spi.write(arg >> 24);
Marknaja 0:7cd1533897a3 250 _spi.write(arg >> 16);
Marknaja 0:7cd1533897a3 251 _spi.write(arg >> 8);
Marknaja 0:7cd1533897a3 252 _spi.write(arg >> 0);
Marknaja 0:7cd1533897a3 253 _spi.write(0x95);
Marknaja 0:7cd1533897a3 254
Marknaja 0:7cd1533897a3 255 // wait for the repsonse (response[7] == 0)
Marknaja 0:7cd1533897a3 256 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
Marknaja 0:7cd1533897a3 257 int response = _spi.write(0xFF);
Marknaja 0:7cd1533897a3 258 if (!(response & 0x80)) {
Marknaja 0:7cd1533897a3 259 _cs = 1;
Marknaja 0:7cd1533897a3 260 _spi.write(0xFF);
Marknaja 0:7cd1533897a3 261 return response;
Marknaja 0:7cd1533897a3 262 }
Marknaja 0:7cd1533897a3 263 }
Marknaja 0:7cd1533897a3 264 _cs = 1;
Marknaja 0:7cd1533897a3 265 _spi.write(0xFF);
Marknaja 0:7cd1533897a3 266 return -1; // timeout
Marknaja 0:7cd1533897a3 267 }
Marknaja 0:7cd1533897a3 268 int SDFileSystem::_cmdx(int cmd, int arg) {
Marknaja 0:7cd1533897a3 269 _cs = 0;
Marknaja 0:7cd1533897a3 270
Marknaja 0:7cd1533897a3 271 // send a command
Marknaja 0:7cd1533897a3 272 _spi.write(0x40 | cmd);
Marknaja 0:7cd1533897a3 273 _spi.write(arg >> 24);
Marknaja 0:7cd1533897a3 274 _spi.write(arg >> 16);
Marknaja 0:7cd1533897a3 275 _spi.write(arg >> 8);
Marknaja 0:7cd1533897a3 276 _spi.write(arg >> 0);
Marknaja 0:7cd1533897a3 277 _spi.write(0x95);
Marknaja 0:7cd1533897a3 278
Marknaja 0:7cd1533897a3 279 // wait for the repsonse (response[7] == 0)
Marknaja 0:7cd1533897a3 280 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
Marknaja 0:7cd1533897a3 281 int response = _spi.write(0xFF);
Marknaja 0:7cd1533897a3 282 if (!(response & 0x80)) {
Marknaja 0:7cd1533897a3 283 return response;
Marknaja 0:7cd1533897a3 284 }
Marknaja 0:7cd1533897a3 285 }
Marknaja 0:7cd1533897a3 286 _cs = 1;
Marknaja 0:7cd1533897a3 287 _spi.write(0xFF);
Marknaja 0:7cd1533897a3 288 return -1; // timeout
Marknaja 0:7cd1533897a3 289 }
Marknaja 0:7cd1533897a3 290
Marknaja 0:7cd1533897a3 291
Marknaja 0:7cd1533897a3 292 int SDFileSystem::_cmd58() {
Marknaja 0:7cd1533897a3 293 _cs = 0;
Marknaja 0:7cd1533897a3 294 int arg = 0;
Marknaja 0:7cd1533897a3 295
Marknaja 0:7cd1533897a3 296 // send a command
Marknaja 0:7cd1533897a3 297 _spi.write(0x40 | 58);
Marknaja 0:7cd1533897a3 298 _spi.write(arg >> 24);
Marknaja 0:7cd1533897a3 299 _spi.write(arg >> 16);
Marknaja 0:7cd1533897a3 300 _spi.write(arg >> 8);
Marknaja 0:7cd1533897a3 301 _spi.write(arg >> 0);
Marknaja 0:7cd1533897a3 302 _spi.write(0x95);
Marknaja 0:7cd1533897a3 303
Marknaja 0:7cd1533897a3 304 // wait for the repsonse (response[7] == 0)
Marknaja 0:7cd1533897a3 305 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
Marknaja 0:7cd1533897a3 306 int response = _spi.write(0xFF);
Marknaja 0:7cd1533897a3 307 if (!(response & 0x80)) {
Marknaja 0:7cd1533897a3 308 int ocr = _spi.write(0xFF) << 24;
Marknaja 0:7cd1533897a3 309 ocr |= _spi.write(0xFF) << 16;
Marknaja 0:7cd1533897a3 310 ocr |= _spi.write(0xFF) << 8;
Marknaja 0:7cd1533897a3 311 ocr |= _spi.write(0xFF) << 0;
Marknaja 0:7cd1533897a3 312 _cs = 1;
Marknaja 0:7cd1533897a3 313 _spi.write(0xFF);
Marknaja 0:7cd1533897a3 314 return response;
Marknaja 0:7cd1533897a3 315 }
Marknaja 0:7cd1533897a3 316 }
Marknaja 0:7cd1533897a3 317 _cs = 1;
Marknaja 0:7cd1533897a3 318 _spi.write(0xFF);
Marknaja 0:7cd1533897a3 319 return -1; // timeout
Marknaja 0:7cd1533897a3 320 }
Marknaja 0:7cd1533897a3 321
Marknaja 0:7cd1533897a3 322 int SDFileSystem::_cmd8() {
Marknaja 0:7cd1533897a3 323 _cs = 0;
Marknaja 0:7cd1533897a3 324
Marknaja 0:7cd1533897a3 325 // send a command
Marknaja 0:7cd1533897a3 326 _spi.write(0x40 | 8); // CMD8
Marknaja 0:7cd1533897a3 327 _spi.write(0x00); // reserved
Marknaja 0:7cd1533897a3 328 _spi.write(0x00); // reserved
Marknaja 0:7cd1533897a3 329 _spi.write(0x01); // 3.3v
Marknaja 0:7cd1533897a3 330 _spi.write(0xAA); // check pattern
Marknaja 0:7cd1533897a3 331 _spi.write(0x87); // crc
Marknaja 0:7cd1533897a3 332
Marknaja 0:7cd1533897a3 333 // wait for the repsonse (response[7] == 0)
Marknaja 0:7cd1533897a3 334 for (int i = 0; i < SD_COMMAND_TIMEOUT * 1000; i++) {
Marknaja 0:7cd1533897a3 335 char response[5];
Marknaja 0:7cd1533897a3 336 response[0] = _spi.write(0xFF);
Marknaja 0:7cd1533897a3 337 if (!(response[0] & 0x80)) {
Marknaja 0:7cd1533897a3 338 for (int j = 1; j < 5; j++) {
Marknaja 0:7cd1533897a3 339 response[i] = _spi.write(0xFF);
Marknaja 0:7cd1533897a3 340 }
Marknaja 0:7cd1533897a3 341 _cs = 1;
Marknaja 0:7cd1533897a3 342 _spi.write(0xFF);
Marknaja 0:7cd1533897a3 343 return response[0];
Marknaja 0:7cd1533897a3 344 }
Marknaja 0:7cd1533897a3 345 }
Marknaja 0:7cd1533897a3 346 _cs = 1;
Marknaja 0:7cd1533897a3 347 _spi.write(0xFF);
Marknaja 0:7cd1533897a3 348 return -1; // timeout
Marknaja 0:7cd1533897a3 349 }
Marknaja 0:7cd1533897a3 350
Marknaja 0:7cd1533897a3 351 int SDFileSystem::_read(uint8_t *buffer, uint32_t length) {
Marknaja 0:7cd1533897a3 352 _cs = 0;
Marknaja 0:7cd1533897a3 353
Marknaja 0:7cd1533897a3 354 // read until start byte (0xFF)
Marknaja 0:7cd1533897a3 355 while (_spi.write(0xFF) != 0xFE);
Marknaja 0:7cd1533897a3 356
Marknaja 0:7cd1533897a3 357 // read data
Marknaja 0:7cd1533897a3 358 for (int i = 0; i < length; i++) {
Marknaja 0:7cd1533897a3 359 buffer[i] = _spi.write(0xFF);
Marknaja 0:7cd1533897a3 360 }
Marknaja 0:7cd1533897a3 361 _spi.write(0xFF); // checksum
Marknaja 0:7cd1533897a3 362 _spi.write(0xFF);
Marknaja 0:7cd1533897a3 363
Marknaja 0:7cd1533897a3 364 _cs = 1;
Marknaja 0:7cd1533897a3 365 _spi.write(0xFF);
Marknaja 0:7cd1533897a3 366 return 0;
Marknaja 0:7cd1533897a3 367 }
Marknaja 0:7cd1533897a3 368
Marknaja 0:7cd1533897a3 369 int SDFileSystem::_write(const uint8_t*buffer, uint32_t length) {
Marknaja 0:7cd1533897a3 370 _cs = 0;
Marknaja 0:7cd1533897a3 371
Marknaja 0:7cd1533897a3 372 // indicate start of block
Marknaja 0:7cd1533897a3 373 _spi.write(0xFE);
Marknaja 0:7cd1533897a3 374
Marknaja 0:7cd1533897a3 375 // write the data
Marknaja 0:7cd1533897a3 376 for (int i = 0; i < length; i++) {
Marknaja 0:7cd1533897a3 377 _spi.write(buffer[i]);
Marknaja 0:7cd1533897a3 378 }
Marknaja 0:7cd1533897a3 379
Marknaja 0:7cd1533897a3 380 // write the checksum
Marknaja 0:7cd1533897a3 381 _spi.write(0xFF);
Marknaja 0:7cd1533897a3 382 _spi.write(0xFF);
Marknaja 0:7cd1533897a3 383
Marknaja 0:7cd1533897a3 384 // check the response token
Marknaja 0:7cd1533897a3 385 if ((_spi.write(0xFF) & 0x1F) != 0x05) {
Marknaja 0:7cd1533897a3 386 _cs = 1;
Marknaja 0:7cd1533897a3 387 _spi.write(0xFF);
Marknaja 0:7cd1533897a3 388 return 1;
Marknaja 0:7cd1533897a3 389 }
Marknaja 0:7cd1533897a3 390
Marknaja 0:7cd1533897a3 391 // wait for write to finish
Marknaja 0:7cd1533897a3 392 while (_spi.write(0xFF) == 0);
Marknaja 0:7cd1533897a3 393
Marknaja 0:7cd1533897a3 394 _cs = 1;
Marknaja 0:7cd1533897a3 395 _spi.write(0xFF);
Marknaja 0:7cd1533897a3 396 return 0;
Marknaja 0:7cd1533897a3 397 }
Marknaja 0:7cd1533897a3 398
Marknaja 0:7cd1533897a3 399 static uint32_t ext_bits(unsigned char *data, int msb, int lsb) {
Marknaja 0:7cd1533897a3 400 uint32_t bits = 0;
Marknaja 0:7cd1533897a3 401 uint32_t size = 1 + msb - lsb;
Marknaja 0:7cd1533897a3 402 for (int i = 0; i < size; i++) {
Marknaja 0:7cd1533897a3 403 uint32_t position = lsb + i;
Marknaja 0:7cd1533897a3 404 uint32_t byte = 15 - (position >> 3);
Marknaja 0:7cd1533897a3 405 uint32_t bit = position & 0x7;
Marknaja 0:7cd1533897a3 406 uint32_t value = (data[byte] >> bit) & 1;
Marknaja 0:7cd1533897a3 407 bits |= value << i;
Marknaja 0:7cd1533897a3 408 }
Marknaja 0:7cd1533897a3 409 return bits;
Marknaja 0:7cd1533897a3 410 }
Marknaja 0:7cd1533897a3 411
Marknaja 0:7cd1533897a3 412 uint64_t SDFileSystem::_sd_sectors() {
Marknaja 0:7cd1533897a3 413 uint32_t c_size, c_size_mult, read_bl_len;
Marknaja 0:7cd1533897a3 414 uint32_t block_len, mult, blocknr, capacity;
Marknaja 0:7cd1533897a3 415 uint32_t hc_c_size;
Marknaja 0:7cd1533897a3 416 uint64_t blocks;
Marknaja 0:7cd1533897a3 417
Marknaja 0:7cd1533897a3 418 // CMD9, Response R2 (R1 byte + 16-byte block read)
Marknaja 0:7cd1533897a3 419 if (_cmdx(9, 0) != 0) {
Marknaja 0:7cd1533897a3 420 debug("Didn't get a response from the disk\n");
Marknaja 0:7cd1533897a3 421 return 0;
Marknaja 0:7cd1533897a3 422 }
Marknaja 0:7cd1533897a3 423
Marknaja 0:7cd1533897a3 424 uint8_t csd[16];
Marknaja 0:7cd1533897a3 425 if (_read(csd, 16) != 0) {
Marknaja 0:7cd1533897a3 426 debug("Couldn't read csd response from disk\n");
Marknaja 0:7cd1533897a3 427 return 0;
Marknaja 0:7cd1533897a3 428 }
Marknaja 0:7cd1533897a3 429
Marknaja 0:7cd1533897a3 430 // csd_structure : csd[127:126]
Marknaja 0:7cd1533897a3 431 // c_size : csd[73:62]
Marknaja 0:7cd1533897a3 432 // c_size_mult : csd[49:47]
Marknaja 0:7cd1533897a3 433 // read_bl_len : csd[83:80] - the *maximum* read block length
Marknaja 0:7cd1533897a3 434
Marknaja 0:7cd1533897a3 435 int csd_structure = ext_bits(csd, 127, 126);
Marknaja 0:7cd1533897a3 436
Marknaja 0:7cd1533897a3 437 switch (csd_structure) {
Marknaja 0:7cd1533897a3 438 case 0:
Marknaja 0:7cd1533897a3 439 cdv = 512;
Marknaja 0:7cd1533897a3 440 c_size = ext_bits(csd, 73, 62);
Marknaja 0:7cd1533897a3 441 c_size_mult = ext_bits(csd, 49, 47);
Marknaja 0:7cd1533897a3 442 read_bl_len = ext_bits(csd, 83, 80);
Marknaja 0:7cd1533897a3 443
Marknaja 0:7cd1533897a3 444 block_len = 1 << read_bl_len;
Marknaja 0:7cd1533897a3 445 mult = 1 << (c_size_mult + 2);
Marknaja 0:7cd1533897a3 446 blocknr = (c_size + 1) * mult;
Marknaja 0:7cd1533897a3 447 capacity = blocknr * block_len;
Marknaja 0:7cd1533897a3 448 blocks = capacity / 512;
Marknaja 0:7cd1533897a3 449 debug_if(SD_DBG, "\n\rSDCard\n\rc_size: %d \n\rcapacity: %ld \n\rsectors: %lld\n\r", c_size, capacity, blocks);
Marknaja 0:7cd1533897a3 450 break;
Marknaja 0:7cd1533897a3 451
Marknaja 0:7cd1533897a3 452 case 1:
Marknaja 0:7cd1533897a3 453 cdv = 1;
Marknaja 0:7cd1533897a3 454 hc_c_size = ext_bits(csd, 63, 48);
Marknaja 0:7cd1533897a3 455 blocks = (hc_c_size+1)*1024;
Marknaja 0:7cd1533897a3 456 debug_if(SD_DBG, "\n\rSDHC Card \n\rhc_c_size: %d\n\rcapacity: %lld \n\rsectors: %lld\n\r", hc_c_size, blocks*512, blocks);
Marknaja 0:7cd1533897a3 457 break;
Marknaja 0:7cd1533897a3 458
Marknaja 0:7cd1533897a3 459 default:
Marknaja 0:7cd1533897a3 460 debug("CSD struct unsupported\r\n");
Marknaja 0:7cd1533897a3 461 return 0;
Marknaja 0:7cd1533897a3 462 };
Marknaja 0:7cd1533897a3 463 return blocks;
Marknaja 0:7cd1533897a3 464 }
Marknaja 0:7cd1533897a3 465