Kazumi Yamaguchi / SDFileSystem-mei

share with member

Dependencies:   FATFileSystem

SDFileSystem.cpp@0:2212b0aadd24, 2021-12-27 (annotated)

Committer:
yamaguchikung
Date:
Mon Dec 27 10:26:22 2021 +0000
Revision:
0:2212b0aadd24
sdfile;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
yamaguchikung 0:2212b0aadd24 1 /* mbed Microcontroller Library
yamaguchikung 0:2212b0aadd24 2 * Copyright (c) 2006-2012 ARM Limited
yamaguchikung 0:2212b0aadd24 3 *
yamaguchikung 0:2212b0aadd24 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
yamaguchikung 0:2212b0aadd24 5 * of this software and associated documentation files (the "Software"), to deal
yamaguchikung 0:2212b0aadd24 6 * in the Software without restriction, including without limitation the rights
yamaguchikung 0:2212b0aadd24 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
yamaguchikung 0:2212b0aadd24 8 * copies of the Software, and to permit persons to whom the Software is
yamaguchikung 0:2212b0aadd24 9 * furnished to do so, subject to the following conditions:
yamaguchikung 0:2212b0aadd24 10 *
yamaguchikung 0:2212b0aadd24 11 * The above copyright notice and this permission notice shall be included in
yamaguchikung 0:2212b0aadd24 12 * all copies or substantial portions of the Software.
yamaguchikung 0:2212b0aadd24 13 *
yamaguchikung 0:2212b0aadd24 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
yamaguchikung 0:2212b0aadd24 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
yamaguchikung 0:2212b0aadd24 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
yamaguchikung 0:2212b0aadd24 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
yamaguchikung 0:2212b0aadd24 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
yamaguchikung 0:2212b0aadd24 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
yamaguchikung 0:2212b0aadd24 20 * SOFTWARE.
yamaguchikung 0:2212b0aadd24 21 */
yamaguchikung 0:2212b0aadd24 22 /* Introduction
yamaguchikung 0:2212b0aadd24 23 * ------------
yamaguchikung 0:2212b0aadd24 24 * SD and MMC cards support a number of interfaces, but common to them all
yamaguchikung 0:2212b0aadd24 25 * is one based on SPI. This is the one I'm implmenting because it means
yamaguchikung 0:2212b0aadd24 26 * it is much more portable even though not so performant, and we already
yamaguchikung 0:2212b0aadd24 27 * have the mbed SPI Interface!
yamaguchikung 0:2212b0aadd24 28 *
yamaguchikung 0:2212b0aadd24 29 * The main reference I'm using is Chapter 7, "SPI Mode" of:
yamaguchikung 0:2212b0aadd24 30 * http://www.sdcard.org/developers/tech/sdcard/pls/Simplified_Physical_Layer_Spec.pdf
yamaguchikung 0:2212b0aadd24 31 *
yamaguchikung 0:2212b0aadd24 32 * SPI Startup
yamaguchikung 0:2212b0aadd24 33 * -----------
yamaguchikung 0:2212b0aadd24 34 * The SD card powers up in SD mode. The SPI interface mode is selected by
yamaguchikung 0:2212b0aadd24 35 * asserting CS low and sending the reset command (CMD0). The card will
yamaguchikung 0:2212b0aadd24 36 * respond with a (R1) response.
yamaguchikung 0:2212b0aadd24 37 *
yamaguchikung 0:2212b0aadd24 38 * CMD8 is optionally sent to determine the voltage range supported, and
yamaguchikung 0:2212b0aadd24 39 * indirectly determine whether it is a version 1.x SD/non-SD card or
yamaguchikung 0:2212b0aadd24 40 * version 2.x. I'll just ignore this for now.
yamaguchikung 0:2212b0aadd24 41 *
yamaguchikung 0:2212b0aadd24 42 * ACMD41 is repeatedly issued to initialise the card, until "in idle"
yamaguchikung 0:2212b0aadd24 43 * (bit 0) of the R1 response goes to '0', indicating it is initialised.
yamaguchikung 0:2212b0aadd24 44 *
yamaguchikung 0:2212b0aadd24 45 * You should also indicate whether the host supports High Capicity cards,
yamaguchikung 0:2212b0aadd24 46 * and check whether the card is high capacity - i'll also ignore this
yamaguchikung 0:2212b0aadd24 47 *
yamaguchikung 0:2212b0aadd24 48 * SPI Protocol
yamaguchikung 0:2212b0aadd24 49 * ------------
yamaguchikung 0:2212b0aadd24 50 * The SD SPI protocol is based on transactions made up of 8-bit words, with
yamaguchikung 0:2212b0aadd24 51 * the host starting every bus transaction by asserting the CS signal low. The
yamaguchikung 0:2212b0aadd24 52 * card always responds to commands, data blocks and errors.
yamaguchikung 0:2212b0aadd24 53 *
yamaguchikung 0:2212b0aadd24 54 * The protocol supports a CRC, but by default it is off (except for the
yamaguchikung 0:2212b0aadd24 55 * first reset CMD0, where the CRC can just be pre-calculated, and CMD8)
yamaguchikung 0:2212b0aadd24 56 * I'll leave the CRC off I think!
yamaguchikung 0:2212b0aadd24 57 *
yamaguchikung 0:2212b0aadd24 58 * Standard capacity cards have variable data block sizes, whereas High
yamaguchikung 0:2212b0aadd24 59 * Capacity cards fix the size of data block to 512 bytes. I'll therefore
yamaguchikung 0:2212b0aadd24 60 * just always use the Standard Capacity cards with a block size of 512 bytes.
yamaguchikung 0:2212b0aadd24 61 * This is set with CMD16.
yamaguchikung 0:2212b0aadd24 62 *
yamaguchikung 0:2212b0aadd24 63 * You can read and write single blocks (CMD17, CMD25) or multiple blocks
yamaguchikung 0:2212b0aadd24 64 * (CMD18, CMD25). For simplicity, I'll just use single block accesses. When
yamaguchikung 0:2212b0aadd24 65 * the card gets a read command, it responds with a response token, and then
yamaguchikung 0:2212b0aadd24 66 * a data token or an error.
yamaguchikung 0:2212b0aadd24 67 *
yamaguchikung 0:2212b0aadd24 68 * SPI Command Format
yamaguchikung 0:2212b0aadd24 69 * ------------------
yamaguchikung 0:2212b0aadd24 70 * Commands are 6-bytes long, containing the command, 32-bit argument, and CRC.
yamaguchikung 0:2212b0aadd24 71 *
yamaguchikung 0:2212b0aadd24 72 * +---------------+------------+------------+-----------+----------+--------------+
yamaguchikung 0:2212b0aadd24 73 * | 01 | cmd[5:0] | arg[31:24] | arg[23:16] | arg[15:8] | arg[7:0] | crc[6:0] | 1 |
yamaguchikung 0:2212b0aadd24 74 * +---------------+------------+------------+-----------+----------+--------------+
yamaguchikung 0:2212b0aadd24 75 *
yamaguchikung 0:2212b0aadd24 76 * As I'm not using CRC, I can fix that byte to what is needed for CMD0 (0x95)
yamaguchikung 0:2212b0aadd24 77 *
yamaguchikung 0:2212b0aadd24 78 * All Application Specific commands shall be preceded with APP_CMD (CMD55).
yamaguchikung 0:2212b0aadd24 79 *
yamaguchikung 0:2212b0aadd24 80 * SPI Response Format
yamaguchikung 0:2212b0aadd24 81 * -------------------
yamaguchikung 0:2212b0aadd24 82 * The main response format (R1) is a status byte (normally zero). Key flags:
yamaguchikung 0:2212b0aadd24 83 * idle - 1 if the card is in an idle state/initialising
yamaguchikung 0:2212b0aadd24 84 * cmd - 1 if an illegal command code was detected
yamaguchikung 0:2212b0aadd24 85 *
yamaguchikung 0:2212b0aadd24 86 * +-------------------------------------------------+
yamaguchikung 0:2212b0aadd24 87 * R1 | 0 | arg | addr | seq | crc | cmd | erase | idle |
yamaguchikung 0:2212b0aadd24 88 * +-------------------------------------------------+
yamaguchikung 0:2212b0aadd24 89 *
yamaguchikung 0:2212b0aadd24 90 * R1b is the same, except it is followed by a busy signal (zeros) until
yamaguchikung 0:2212b0aadd24 91 * the first non-zero byte when it is ready again.
yamaguchikung 0:2212b0aadd24 92 *
yamaguchikung 0:2212b0aadd24 93 * Data Response Token
yamaguchikung 0:2212b0aadd24 94 * -------------------
yamaguchikung 0:2212b0aadd24 95 * Every data block written to the card is acknowledged by a byte
yamaguchikung 0:2212b0aadd24 96 * response token
yamaguchikung 0:2212b0aadd24 97 *
yamaguchikung 0:2212b0aadd24 98 * +----------------------+
yamaguchikung 0:2212b0aadd24 99 * | xxx | 0 | status | 1 |
yamaguchikung 0:2212b0aadd24 100 * +----------------------+
yamaguchikung 0:2212b0aadd24 101 * 010 - OK!
yamaguchikung 0:2212b0aadd24 102 * 101 - CRC Error
yamaguchikung 0:2212b0aadd24 103 * 110 - Write Error
yamaguchikung 0:2212b0aadd24 104 *
yamaguchikung 0:2212b0aadd24 105 * Single Block Read and Write
yamaguchikung 0:2212b0aadd24 106 * ---------------------------
yamaguchikung 0:2212b0aadd24 107 *
yamaguchikung 0:2212b0aadd24 108 * Block transfers have a byte header, followed by the data, followed
yamaguchikung 0:2212b0aadd24 109 * by a 16-bit CRC. In our case, the data will always be 512 bytes.
yamaguchikung 0:2212b0aadd24 110 *
yamaguchikung 0:2212b0aadd24 111 * +------+---------+---------+- - - -+---------+-----------+----------+
yamaguchikung 0:2212b0aadd24 112 * | 0xFE | data[0] | data[1] | | data[n] | crc[15:8] | crc[7:0] |
yamaguchikung 0:2212b0aadd24 113 * +------+---------+---------+- - - -+---------+-----------+----------+
yamaguchikung 0:2212b0aadd24 114 */
yamaguchikung 0:2212b0aadd24 115 #include "SDFileSystem.h"
yamaguchikung 0:2212b0aadd24 116 #include "mbed_debug.h"
yamaguchikung 0:2212b0aadd24 117
yamaguchikung 0:2212b0aadd24 118 #define SD_COMMAND_TIMEOUT 5000
yamaguchikung 0:2212b0aadd24 119
yamaguchikung 0:2212b0aadd24 120 #define SD_DBG 0
yamaguchikung 0:2212b0aadd24 121
yamaguchikung 0:2212b0aadd24 122 SDFileSystem::SDFileSystem(PinName mosi, PinName miso, PinName sclk, PinName cs, const char* name) :
yamaguchikung 0:2212b0aadd24 123 FATFileSystem(name), _spi(mosi, miso, sclk), _cs(cs), _is_initialized(0) {
yamaguchikung 0:2212b0aadd24 124 _cs = 1;
yamaguchikung 0:2212b0aadd24 125
yamaguchikung 0:2212b0aadd24 126 // Set default to 100kHz for initialisation and 1MHz for data transfer
yamaguchikung 0:2212b0aadd24 127 _init_sck = 100000;
yamaguchikung 0:2212b0aadd24 128 _transfer_sck = 1000000;
yamaguchikung 0:2212b0aadd24 129 }
yamaguchikung 0:2212b0aadd24 130
yamaguchikung 0:2212b0aadd24 131 #define R1_IDLE_STATE (1 << 0)
yamaguchikung 0:2212b0aadd24 132 #define R1_ERASE_RESET (1 << 1)
yamaguchikung 0:2212b0aadd24 133 #define R1_ILLEGAL_COMMAND (1 << 2)
yamaguchikung 0:2212b0aadd24 134 #define R1_COM_CRC_ERROR (1 << 3)
yamaguchikung 0:2212b0aadd24 135 #define R1_ERASE_SEQUENCE_ERROR (1 << 4)
yamaguchikung 0:2212b0aadd24 136 #define R1_ADDRESS_ERROR (1 << 5)
yamaguchikung 0:2212b0aadd24 137 #define R1_PARAMETER_ERROR (1 << 6)
yamaguchikung 0:2212b0aadd24 138
yamaguchikung 0:2212b0aadd24 139 // Types
yamaguchikung 0:2212b0aadd24 140 // - v1.x Standard Capacity
yamaguchikung 0:2212b0aadd24 141 // - v2.x Standard Capacity
yamaguchikung 0:2212b0aadd24 142 // - v2.x High Capacity
yamaguchikung 0:2212b0aadd24 143 // - Not recognised as an SD Card
yamaguchikung 0:2212b0aadd24 144 #define SDCARD_FAIL 0
yamaguchikung 0:2212b0aadd24 145 #define SDCARD_V1 1
yamaguchikung 0:2212b0aadd24 146 #define SDCARD_V2 2
yamaguchikung 0:2212b0aadd24 147 #define SDCARD_V2HC 3
yamaguchikung 0:2212b0aadd24 148
yamaguchikung 0:2212b0aadd24 149 int SDFileSystem::initialise_card() {
yamaguchikung 0:2212b0aadd24 150 // Set to SCK for initialisation, and clock card with cs = 1
yamaguchikung 0:2212b0aadd24 151 _spi.frequency(_init_sck);
yamaguchikung 0:2212b0aadd24 152 _cs = 1;
yamaguchikung 0:2212b0aadd24 153 for (int i = 0; i < 16; i++) {
yamaguchikung 0:2212b0aadd24 154 _spi.write(0xFF);
yamaguchikung 0:2212b0aadd24 155 }
yamaguchikung 0:2212b0aadd24 156
yamaguchikung 0:2212b0aadd24 157 // send CMD0, should return with all zeros except IDLE STATE set (bit 0)
yamaguchikung 0:2212b0aadd24 158 if (_cmd(0, 0) != R1_IDLE_STATE) {
yamaguchikung 0:2212b0aadd24 159 debug("No disk, or could not put SD card in to SPI idle state\n");
yamaguchikung 0:2212b0aadd24 160 return SDCARD_FAIL;
yamaguchikung 0:2212b0aadd24 161 }
yamaguchikung 0:2212b0aadd24 162
yamaguchikung 0:2212b0aadd24 163 // send CMD8 to determine whther it is ver 2.x
yamaguchikung 0:2212b0aadd24 164 int r = _cmd8();
yamaguchikung 0:2212b0aadd24 165 if (r == R1_IDLE_STATE) {
yamaguchikung 0:2212b0aadd24 166 return initialise_card_v2();
yamaguchikung 0:2212b0aadd24 167 } else if (r == (R1_IDLE_STATE | R1_ILLEGAL_COMMAND)) {
yamaguchikung 0:2212b0aadd24 168 return initialise_card_v1();
yamaguchikung 0:2212b0aadd24 169 } else {
yamaguchikung 0:2212b0aadd24 170 debug("Not in idle state after sending CMD8 (not an SD card?)\n");
yamaguchikung 0:2212b0aadd24 171 return SDCARD_FAIL;
yamaguchikung 0:2212b0aadd24 172 }
yamaguchikung 0:2212b0aadd24 173 }
yamaguchikung 0:2212b0aadd24 174
yamaguchikung 0:2212b0aadd24 175 int SDFileSystem::initialise_card_v1() {
yamaguchikung 0:2212b0aadd24 176 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
yamaguchikung 0:2212b0aadd24 177 _cmd(55, 0);
yamaguchikung 0:2212b0aadd24 178 if (_cmd(41, 0) == 0) {
yamaguchikung 0:2212b0aadd24 179 cdv = 512;
yamaguchikung 0:2212b0aadd24 180 debug_if(SD_DBG, "\n\rInit: SEDCARD_V1\n\r");
yamaguchikung 0:2212b0aadd24 181 return SDCARD_V1;
yamaguchikung 0:2212b0aadd24 182 }
yamaguchikung 0:2212b0aadd24 183 }
yamaguchikung 0:2212b0aadd24 184
yamaguchikung 0:2212b0aadd24 185 debug("Timeout waiting for v1.x card\n");
yamaguchikung 0:2212b0aadd24 186 return SDCARD_FAIL;
yamaguchikung 0:2212b0aadd24 187 }
yamaguchikung 0:2212b0aadd24 188
yamaguchikung 0:2212b0aadd24 189 int SDFileSystem::initialise_card_v2() {
yamaguchikung 0:2212b0aadd24 190 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
yamaguchikung 0:2212b0aadd24 191 wait_ms(50);
yamaguchikung 0:2212b0aadd24 192 _cmd58();
yamaguchikung 0:2212b0aadd24 193 _cmd(55, 0);
yamaguchikung 0:2212b0aadd24 194 if (_cmd(41, 0x40000000) == 0) {
yamaguchikung 0:2212b0aadd24 195 _cmd58();
yamaguchikung 0:2212b0aadd24 196 debug_if(SD_DBG, "\n\rInit: SDCARD_V2\n\r");
yamaguchikung 0:2212b0aadd24 197 cdv = 1;
yamaguchikung 0:2212b0aadd24 198 return SDCARD_V2;
yamaguchikung 0:2212b0aadd24 199 }
yamaguchikung 0:2212b0aadd24 200 }
yamaguchikung 0:2212b0aadd24 201
yamaguchikung 0:2212b0aadd24 202 debug("Timeout waiting for v2.x card\n");
yamaguchikung 0:2212b0aadd24 203 return SDCARD_FAIL;
yamaguchikung 0:2212b0aadd24 204 }
yamaguchikung 0:2212b0aadd24 205
yamaguchikung 0:2212b0aadd24 206 int SDFileSystem::disk_initialize() {
yamaguchikung 0:2212b0aadd24 207 _is_initialized = initialise_card();
yamaguchikung 0:2212b0aadd24 208 if (_is_initialized == 0) {
yamaguchikung 0:2212b0aadd24 209 debug("Fail to initialize card\n");
yamaguchikung 0:2212b0aadd24 210 return 1;
yamaguchikung 0:2212b0aadd24 211 }
yamaguchikung 0:2212b0aadd24 212 debug_if(SD_DBG, "init card = %d\n", _is_initialized);
yamaguchikung 0:2212b0aadd24 213 _sectors = _sd_sectors();
yamaguchikung 0:2212b0aadd24 214
yamaguchikung 0:2212b0aadd24 215 // Set block length to 512 (CMD16)
yamaguchikung 0:2212b0aadd24 216 if (_cmd(16, 512) != 0) {
yamaguchikung 0:2212b0aadd24 217 debug("Set 512-byte block timed out\n");
yamaguchikung 0:2212b0aadd24 218 return 1;
yamaguchikung 0:2212b0aadd24 219 }
yamaguchikung 0:2212b0aadd24 220
yamaguchikung 0:2212b0aadd24 221 // Set SCK for data transfer
yamaguchikung 0:2212b0aadd24 222 _spi.frequency(_transfer_sck);
yamaguchikung 0:2212b0aadd24 223 return 0;
yamaguchikung 0:2212b0aadd24 224 }
yamaguchikung 0:2212b0aadd24 225
yamaguchikung 0:2212b0aadd24 226 int SDFileSystem::disk_write(const uint8_t* buffer, uint32_t block_number, uint32_t count) {
yamaguchikung 0:2212b0aadd24 227 if (!_is_initialized) {
yamaguchikung 0:2212b0aadd24 228 return -1;
yamaguchikung 0:2212b0aadd24 229 }
yamaguchikung 0:2212b0aadd24 230
yamaguchikung 0:2212b0aadd24 231 for (uint32_t b = block_number; b < block_number + count; b++) {
yamaguchikung 0:2212b0aadd24 232 // set write address for single block (CMD24)
yamaguchikung 0:2212b0aadd24 233 if (_cmd(24, b * cdv) != 0) {
yamaguchikung 0:2212b0aadd24 234 return 1;
yamaguchikung 0:2212b0aadd24 235 }
yamaguchikung 0:2212b0aadd24 236
yamaguchikung 0:2212b0aadd24 237 // send the data block
yamaguchikung 0:2212b0aadd24 238 _write(buffer, 512);
yamaguchikung 0:2212b0aadd24 239 buffer += 512;
yamaguchikung 0:2212b0aadd24 240 }
yamaguchikung 0:2212b0aadd24 241
yamaguchikung 0:2212b0aadd24 242 return 0;
yamaguchikung 0:2212b0aadd24 243 }
yamaguchikung 0:2212b0aadd24 244
yamaguchikung 0:2212b0aadd24 245 int SDFileSystem::disk_read(uint8_t* buffer, uint32_t block_number, uint32_t count) {
yamaguchikung 0:2212b0aadd24 246 if (!_is_initialized) {
yamaguchikung 0:2212b0aadd24 247 return -1;
yamaguchikung 0:2212b0aadd24 248 }
yamaguchikung 0:2212b0aadd24 249
yamaguchikung 0:2212b0aadd24 250 for (uint32_t b = block_number; b < block_number + count; b++) {
yamaguchikung 0:2212b0aadd24 251 // set read address for single block (CMD17)
yamaguchikung 0:2212b0aadd24 252 if (_cmd(17, b * cdv) != 0) {
yamaguchikung 0:2212b0aadd24 253 return 1;
yamaguchikung 0:2212b0aadd24 254 }
yamaguchikung 0:2212b0aadd24 255
yamaguchikung 0:2212b0aadd24 256 // receive the data
yamaguchikung 0:2212b0aadd24 257 _read(buffer, 512);
yamaguchikung 0:2212b0aadd24 258 buffer += 512;
yamaguchikung 0:2212b0aadd24 259 }
yamaguchikung 0:2212b0aadd24 260
yamaguchikung 0:2212b0aadd24 261 return 0;
yamaguchikung 0:2212b0aadd24 262 }
yamaguchikung 0:2212b0aadd24 263
yamaguchikung 0:2212b0aadd24 264 int SDFileSystem::disk_status() {
yamaguchikung 0:2212b0aadd24 265 // FATFileSystem::disk_status() returns 0 when initialized
yamaguchikung 0:2212b0aadd24 266 if (_is_initialized) {
yamaguchikung 0:2212b0aadd24 267 return 0;
yamaguchikung 0:2212b0aadd24 268 } else {
yamaguchikung 0:2212b0aadd24 269 return 1;
yamaguchikung 0:2212b0aadd24 270 }
yamaguchikung 0:2212b0aadd24 271 }
yamaguchikung 0:2212b0aadd24 272
yamaguchikung 0:2212b0aadd24 273 int SDFileSystem::disk_sync() { return 0; }
yamaguchikung 0:2212b0aadd24 274 uint32_t SDFileSystem::disk_sectors() { return _sectors; }
yamaguchikung 0:2212b0aadd24 275
yamaguchikung 0:2212b0aadd24 276
yamaguchikung 0:2212b0aadd24 277 // PRIVATE FUNCTIONS
yamaguchikung 0:2212b0aadd24 278 int SDFileSystem::_cmd(int cmd, int arg) {
yamaguchikung 0:2212b0aadd24 279 _cs = 0;
yamaguchikung 0:2212b0aadd24 280
yamaguchikung 0:2212b0aadd24 281 // send a command
yamaguchikung 0:2212b0aadd24 282 _spi.write(0x40 | cmd);
yamaguchikung 0:2212b0aadd24 283 _spi.write(arg >> 24);
yamaguchikung 0:2212b0aadd24 284 _spi.write(arg >> 16);
yamaguchikung 0:2212b0aadd24 285 _spi.write(arg >> 8);
yamaguchikung 0:2212b0aadd24 286 _spi.write(arg >> 0);
yamaguchikung 0:2212b0aadd24 287 _spi.write(0x95);
yamaguchikung 0:2212b0aadd24 288
yamaguchikung 0:2212b0aadd24 289 // wait for the repsonse (response[7] == 0)
yamaguchikung 0:2212b0aadd24 290 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
yamaguchikung 0:2212b0aadd24 291 int response = _spi.write(0xFF);
yamaguchikung 0:2212b0aadd24 292 if (!(response & 0x80)) {
yamaguchikung 0:2212b0aadd24 293 _cs = 1;
yamaguchikung 0:2212b0aadd24 294 _spi.write(0xFF);
yamaguchikung 0:2212b0aadd24 295 return response;
yamaguchikung 0:2212b0aadd24 296 }
yamaguchikung 0:2212b0aadd24 297 }
yamaguchikung 0:2212b0aadd24 298 _cs = 1;
yamaguchikung 0:2212b0aadd24 299 _spi.write(0xFF);
yamaguchikung 0:2212b0aadd24 300 return -1; // timeout
yamaguchikung 0:2212b0aadd24 301 }
yamaguchikung 0:2212b0aadd24 302 int SDFileSystem::_cmdx(int cmd, int arg) {
yamaguchikung 0:2212b0aadd24 303 _cs = 0;
yamaguchikung 0:2212b0aadd24 304
yamaguchikung 0:2212b0aadd24 305 // send a command
yamaguchikung 0:2212b0aadd24 306 _spi.write(0x40 | cmd);
yamaguchikung 0:2212b0aadd24 307 _spi.write(arg >> 24);
yamaguchikung 0:2212b0aadd24 308 _spi.write(arg >> 16);
yamaguchikung 0:2212b0aadd24 309 _spi.write(arg >> 8);
yamaguchikung 0:2212b0aadd24 310 _spi.write(arg >> 0);
yamaguchikung 0:2212b0aadd24 311 _spi.write(0x95);
yamaguchikung 0:2212b0aadd24 312
yamaguchikung 0:2212b0aadd24 313 // wait for the repsonse (response[7] == 0)
yamaguchikung 0:2212b0aadd24 314 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
yamaguchikung 0:2212b0aadd24 315 int response = _spi.write(0xFF);
yamaguchikung 0:2212b0aadd24 316 if (!(response & 0x80)) {
yamaguchikung 0:2212b0aadd24 317 return response;
yamaguchikung 0:2212b0aadd24 318 }
yamaguchikung 0:2212b0aadd24 319 }
yamaguchikung 0:2212b0aadd24 320 _cs = 1;
yamaguchikung 0:2212b0aadd24 321 _spi.write(0xFF);
yamaguchikung 0:2212b0aadd24 322 return -1; // timeout
yamaguchikung 0:2212b0aadd24 323 }
yamaguchikung 0:2212b0aadd24 324
yamaguchikung 0:2212b0aadd24 325
yamaguchikung 0:2212b0aadd24 326 int SDFileSystem::_cmd58() {
yamaguchikung 0:2212b0aadd24 327 _cs = 0;
yamaguchikung 0:2212b0aadd24 328 int arg = 0;
yamaguchikung 0:2212b0aadd24 329
yamaguchikung 0:2212b0aadd24 330 // send a command
yamaguchikung 0:2212b0aadd24 331 _spi.write(0x40 | 58);
yamaguchikung 0:2212b0aadd24 332 _spi.write(arg >> 24);
yamaguchikung 0:2212b0aadd24 333 _spi.write(arg >> 16);
yamaguchikung 0:2212b0aadd24 334 _spi.write(arg >> 8);
yamaguchikung 0:2212b0aadd24 335 _spi.write(arg >> 0);
yamaguchikung 0:2212b0aadd24 336 _spi.write(0x95);
yamaguchikung 0:2212b0aadd24 337
yamaguchikung 0:2212b0aadd24 338 // wait for the repsonse (response[7] == 0)
yamaguchikung 0:2212b0aadd24 339 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
yamaguchikung 0:2212b0aadd24 340 int response = _spi.write(0xFF);
yamaguchikung 0:2212b0aadd24 341 if (!(response & 0x80)) {
yamaguchikung 0:2212b0aadd24 342 int ocr = _spi.write(0xFF) << 24;
yamaguchikung 0:2212b0aadd24 343 ocr |= _spi.write(0xFF) << 16;
yamaguchikung 0:2212b0aadd24 344 ocr |= _spi.write(0xFF) << 8;
yamaguchikung 0:2212b0aadd24 345 ocr |= _spi.write(0xFF) << 0;
yamaguchikung 0:2212b0aadd24 346 _cs = 1;
yamaguchikung 0:2212b0aadd24 347 _spi.write(0xFF);
yamaguchikung 0:2212b0aadd24 348 return response;
yamaguchikung 0:2212b0aadd24 349 }
yamaguchikung 0:2212b0aadd24 350 }
yamaguchikung 0:2212b0aadd24 351 _cs = 1;
yamaguchikung 0:2212b0aadd24 352 _spi.write(0xFF);
yamaguchikung 0:2212b0aadd24 353 return -1; // timeout
yamaguchikung 0:2212b0aadd24 354 }
yamaguchikung 0:2212b0aadd24 355
yamaguchikung 0:2212b0aadd24 356 int SDFileSystem::_cmd8() {
yamaguchikung 0:2212b0aadd24 357 _cs = 0;
yamaguchikung 0:2212b0aadd24 358
yamaguchikung 0:2212b0aadd24 359 // send a command
yamaguchikung 0:2212b0aadd24 360 _spi.write(0x40 | 8); // CMD8
yamaguchikung 0:2212b0aadd24 361 _spi.write(0x00); // reserved
yamaguchikung 0:2212b0aadd24 362 _spi.write(0x00); // reserved
yamaguchikung 0:2212b0aadd24 363 _spi.write(0x01); // 3.3v
yamaguchikung 0:2212b0aadd24 364 _spi.write(0xAA); // check pattern
yamaguchikung 0:2212b0aadd24 365 _spi.write(0x87); // crc
yamaguchikung 0:2212b0aadd24 366
yamaguchikung 0:2212b0aadd24 367 // wait for the repsonse (response[7] == 0)
yamaguchikung 0:2212b0aadd24 368 for (int i = 0; i < SD_COMMAND_TIMEOUT * 1000; i++) {
yamaguchikung 0:2212b0aadd24 369 char response[5];
yamaguchikung 0:2212b0aadd24 370 response[0] = _spi.write(0xFF);
yamaguchikung 0:2212b0aadd24 371 if (!(response[0] & 0x80)) {
yamaguchikung 0:2212b0aadd24 372 for (int j = 1; j < 5; j++) {
yamaguchikung 0:2212b0aadd24 373 response[i] = _spi.write(0xFF);
yamaguchikung 0:2212b0aadd24 374 }
yamaguchikung 0:2212b0aadd24 375 _cs = 1;
yamaguchikung 0:2212b0aadd24 376 _spi.write(0xFF);
yamaguchikung 0:2212b0aadd24 377 return response[0];
yamaguchikung 0:2212b0aadd24 378 }
yamaguchikung 0:2212b0aadd24 379 }
yamaguchikung 0:2212b0aadd24 380 _cs = 1;
yamaguchikung 0:2212b0aadd24 381 _spi.write(0xFF);
yamaguchikung 0:2212b0aadd24 382 return -1; // timeout
yamaguchikung 0:2212b0aadd24 383 }
yamaguchikung 0:2212b0aadd24 384
yamaguchikung 0:2212b0aadd24 385 int SDFileSystem::_read(uint8_t *buffer, uint32_t length) {
yamaguchikung 0:2212b0aadd24 386 _cs = 0;
yamaguchikung 0:2212b0aadd24 387
yamaguchikung 0:2212b0aadd24 388 // read until start byte (0xFF)
yamaguchikung 0:2212b0aadd24 389 while (_spi.write(0xFF) != 0xFE);
yamaguchikung 0:2212b0aadd24 390
yamaguchikung 0:2212b0aadd24 391 // read data
yamaguchikung 0:2212b0aadd24 392 for (uint32_t i = 0; i < length; i++) {
yamaguchikung 0:2212b0aadd24 393 buffer[i] = _spi.write(0xFF);
yamaguchikung 0:2212b0aadd24 394 }
yamaguchikung 0:2212b0aadd24 395 _spi.write(0xFF); // checksum
yamaguchikung 0:2212b0aadd24 396 _spi.write(0xFF);
yamaguchikung 0:2212b0aadd24 397
yamaguchikung 0:2212b0aadd24 398 _cs = 1;
yamaguchikung 0:2212b0aadd24 399 _spi.write(0xFF);
yamaguchikung 0:2212b0aadd24 400 return 0;
yamaguchikung 0:2212b0aadd24 401 }
yamaguchikung 0:2212b0aadd24 402
yamaguchikung 0:2212b0aadd24 403 int SDFileSystem::_write(const uint8_t*buffer, uint32_t length) {
yamaguchikung 0:2212b0aadd24 404 _cs = 0;
yamaguchikung 0:2212b0aadd24 405
yamaguchikung 0:2212b0aadd24 406 // indicate start of block
yamaguchikung 0:2212b0aadd24 407 _spi.write(0xFE);
yamaguchikung 0:2212b0aadd24 408
yamaguchikung 0:2212b0aadd24 409 // write the data
yamaguchikung 0:2212b0aadd24 410 for (uint32_t i = 0; i < length; i++) {
yamaguchikung 0:2212b0aadd24 411 _spi.write(buffer[i]);
yamaguchikung 0:2212b0aadd24 412 }
yamaguchikung 0:2212b0aadd24 413
yamaguchikung 0:2212b0aadd24 414 // write the checksum
yamaguchikung 0:2212b0aadd24 415 _spi.write(0xFF);
yamaguchikung 0:2212b0aadd24 416 _spi.write(0xFF);
yamaguchikung 0:2212b0aadd24 417
yamaguchikung 0:2212b0aadd24 418 // check the response token
yamaguchikung 0:2212b0aadd24 419 if ((_spi.write(0xFF) & 0x1F) != 0x05) {
yamaguchikung 0:2212b0aadd24 420 _cs = 1;
yamaguchikung 0:2212b0aadd24 421 _spi.write(0xFF);
yamaguchikung 0:2212b0aadd24 422 return 1;
yamaguchikung 0:2212b0aadd24 423 }
yamaguchikung 0:2212b0aadd24 424
yamaguchikung 0:2212b0aadd24 425 // wait for write to finish
yamaguchikung 0:2212b0aadd24 426 while (_spi.write(0xFF) == 0);
yamaguchikung 0:2212b0aadd24 427
yamaguchikung 0:2212b0aadd24 428 _cs = 1;
yamaguchikung 0:2212b0aadd24 429 _spi.write(0xFF);
yamaguchikung 0:2212b0aadd24 430 return 0;
yamaguchikung 0:2212b0aadd24 431 }
yamaguchikung 0:2212b0aadd24 432
yamaguchikung 0:2212b0aadd24 433 static uint32_t ext_bits(unsigned char *data, int msb, int lsb) {
yamaguchikung 0:2212b0aadd24 434 uint32_t bits = 0;
yamaguchikung 0:2212b0aadd24 435 uint32_t size = 1 + msb - lsb;
yamaguchikung 0:2212b0aadd24 436 for (uint32_t i = 0; i < size; i++) {
yamaguchikung 0:2212b0aadd24 437 uint32_t position = lsb + i;
yamaguchikung 0:2212b0aadd24 438 uint32_t byte = 15 - (position >> 3);
yamaguchikung 0:2212b0aadd24 439 uint32_t bit = position & 0x7;
yamaguchikung 0:2212b0aadd24 440 uint32_t value = (data[byte] >> bit) & 1;
yamaguchikung 0:2212b0aadd24 441 bits |= value << i;
yamaguchikung 0:2212b0aadd24 442 }
yamaguchikung 0:2212b0aadd24 443 return bits;
yamaguchikung 0:2212b0aadd24 444 }
yamaguchikung 0:2212b0aadd24 445
yamaguchikung 0:2212b0aadd24 446 uint32_t SDFileSystem::_sd_sectors() {
yamaguchikung 0:2212b0aadd24 447 uint32_t c_size, c_size_mult, read_bl_len;
yamaguchikung 0:2212b0aadd24 448 uint32_t block_len, mult, blocknr, capacity;
yamaguchikung 0:2212b0aadd24 449 uint32_t hc_c_size;
yamaguchikung 0:2212b0aadd24 450 uint32_t blocks;
yamaguchikung 0:2212b0aadd24 451
yamaguchikung 0:2212b0aadd24 452 // CMD9, Response R2 (R1 byte + 16-byte block read)
yamaguchikung 0:2212b0aadd24 453 if (_cmdx(9, 0) != 0) {
yamaguchikung 0:2212b0aadd24 454 debug("Didn't get a response from the disk\n");
yamaguchikung 0:2212b0aadd24 455 return 0;
yamaguchikung 0:2212b0aadd24 456 }
yamaguchikung 0:2212b0aadd24 457
yamaguchikung 0:2212b0aadd24 458 uint8_t csd[16];
yamaguchikung 0:2212b0aadd24 459 if (_read(csd, 16) != 0) {
yamaguchikung 0:2212b0aadd24 460 debug("Couldn't read csd response from disk\n");
yamaguchikung 0:2212b0aadd24 461 return 0;
yamaguchikung 0:2212b0aadd24 462 }
yamaguchikung 0:2212b0aadd24 463
yamaguchikung 0:2212b0aadd24 464 // csd_structure : csd[127:126]
yamaguchikung 0:2212b0aadd24 465 // c_size : csd[73:62]
yamaguchikung 0:2212b0aadd24 466 // c_size_mult : csd[49:47]
yamaguchikung 0:2212b0aadd24 467 // read_bl_len : csd[83:80] - the *maximum* read block length
yamaguchikung 0:2212b0aadd24 468
yamaguchikung 0:2212b0aadd24 469 int csd_structure = ext_bits(csd, 127, 126);
yamaguchikung 0:2212b0aadd24 470
yamaguchikung 0:2212b0aadd24 471 switch (csd_structure) {
yamaguchikung 0:2212b0aadd24 472 case 0:
yamaguchikung 0:2212b0aadd24 473 cdv = 512;
yamaguchikung 0:2212b0aadd24 474 c_size = ext_bits(csd, 73, 62);
yamaguchikung 0:2212b0aadd24 475 c_size_mult = ext_bits(csd, 49, 47);
yamaguchikung 0:2212b0aadd24 476 read_bl_len = ext_bits(csd, 83, 80);
yamaguchikung 0:2212b0aadd24 477
yamaguchikung 0:2212b0aadd24 478 block_len = 1 << read_bl_len;
yamaguchikung 0:2212b0aadd24 479 mult = 1 << (c_size_mult + 2);
yamaguchikung 0:2212b0aadd24 480 blocknr = (c_size + 1) * mult;
yamaguchikung 0:2212b0aadd24 481 capacity = blocknr * block_len;
yamaguchikung 0:2212b0aadd24 482 blocks = capacity / 512;
yamaguchikung 0:2212b0aadd24 483 debug_if(SD_DBG, "\n\rSDCard\n\rc_size: %d \n\rcapacity: %ld \n\rsectors: %lld\n\r", c_size, capacity, blocks);
yamaguchikung 0:2212b0aadd24 484 break;
yamaguchikung 0:2212b0aadd24 485
yamaguchikung 0:2212b0aadd24 486 case 1:
yamaguchikung 0:2212b0aadd24 487 cdv = 1;
yamaguchikung 0:2212b0aadd24 488 hc_c_size = ext_bits(csd, 63, 48);
yamaguchikung 0:2212b0aadd24 489 blocks = (hc_c_size+1)*1024;
yamaguchikung 0:2212b0aadd24 490 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);
yamaguchikung 0:2212b0aadd24 491 break;
yamaguchikung 0:2212b0aadd24 492
yamaguchikung 0:2212b0aadd24 493 default:
yamaguchikung 0:2212b0aadd24 494 debug("CSD struct unsupported\r\n");
yamaguchikung 0:2212b0aadd24 495 return 0;
yamaguchikung 0:2212b0aadd24 496 };
yamaguchikung 0:2212b0aadd24 497 return blocks;
yamaguchikung 0:2212b0aadd24 498 }