goutham dugyala / SDFileSystem_Axelta

FATFileSystem_old

Dependencies:   FATFilesystem_Axelta

SDFileSystem.cpp@1:ac1f1c74328a, 2016-11-11 (annotated)

Committer:
gauthibit
Date:
Fri Nov 11 06:39:22 2016 +0000
Revision:
1:ac1f1c74328a
Parent:
0:7ba80dad604c 
FAT

Who changed what in which revision?

UserRevisionLine numberNew contents of line
gauthibit 0:7ba80dad604c 1 /* mbed Microcontroller Library
gauthibit 0:7ba80dad604c 2 * Copyright (c) 2006-2012 ARM Limited
gauthibit 0:7ba80dad604c 3 *
gauthibit 0:7ba80dad604c 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
gauthibit 0:7ba80dad604c 5 * of this software and associated documentation files (the "Software"), to deal
gauthibit 0:7ba80dad604c 6 * in the Software without restriction, including without limitation the rights
gauthibit 0:7ba80dad604c 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
gauthibit 0:7ba80dad604c 8 * copies of the Software, and to permit persons to whom the Software is
gauthibit 0:7ba80dad604c 9 * furnished to do so, subject to the following conditions:
gauthibit 0:7ba80dad604c 10 *
gauthibit 0:7ba80dad604c 11 * The above copyright notice and this permission notice shall be included in
gauthibit 0:7ba80dad604c 12 * all copies or substantial portions of the Software.
gauthibit 0:7ba80dad604c 13 *
gauthibit 0:7ba80dad604c 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
gauthibit 0:7ba80dad604c 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
gauthibit 0:7ba80dad604c 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
gauthibit 0:7ba80dad604c 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
gauthibit 0:7ba80dad604c 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
gauthibit 0:7ba80dad604c 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
gauthibit 0:7ba80dad604c 20 * SOFTWARE.
gauthibit 0:7ba80dad604c 21 */
gauthibit 0:7ba80dad604c 22 /* Introduction
gauthibit 0:7ba80dad604c 23 * ------------
gauthibit 0:7ba80dad604c 24 * SD and MMC cards support a number of interfaces, but common to them all
gauthibit 0:7ba80dad604c 25 * is one based on SPI. This is the one I'm implmenting because it means
gauthibit 0:7ba80dad604c 26 * it is much more portable even though not so performant, and we already
gauthibit 0:7ba80dad604c 27 * have the mbed SPI Interface!
gauthibit 0:7ba80dad604c 28 *
gauthibit 0:7ba80dad604c 29 * The main reference I'm using is Chapter 7, "SPI Mode" of:
gauthibit 0:7ba80dad604c 30 * http://www.sdcard.org/developers/tech/sdcard/pls/Simplified_Physical_Layer_Spec.pdf
gauthibit 0:7ba80dad604c 31 *
gauthibit 0:7ba80dad604c 32 * SPI Startup
gauthibit 0:7ba80dad604c 33 * -----------
gauthibit 0:7ba80dad604c 34 * The SD card powers up in SD mode. The SPI interface mode is selected by
gauthibit 0:7ba80dad604c 35 * asserting CS low and sending the reset command (CMD0). The card will
gauthibit 0:7ba80dad604c 36 * respond with a (R1) response.
gauthibit 0:7ba80dad604c 37 *
gauthibit 0:7ba80dad604c 38 * CMD8 is optionally sent to determine the voltage range supported, and
gauthibit 0:7ba80dad604c 39 * indirectly determine whether it is a version 1.x SD/non-SD card or
gauthibit 0:7ba80dad604c 40 * version 2.x. I'll just ignore this for now.
gauthibit 0:7ba80dad604c 41 *
gauthibit 0:7ba80dad604c 42 * ACMD41 is repeatedly issued to initialise the card, until "in idle"
gauthibit 0:7ba80dad604c 43 * (bit 0) of the R1 response goes to '0', indicating it is initialised.
gauthibit 0:7ba80dad604c 44 *
gauthibit 0:7ba80dad604c 45 * You should also indicate whether the host supports High Capicity cards,
gauthibit 0:7ba80dad604c 46 * and check whether the card is high capacity - i'll also ignore this
gauthibit 0:7ba80dad604c 47 *
gauthibit 0:7ba80dad604c 48 * SPI Protocol
gauthibit 0:7ba80dad604c 49 * ------------
gauthibit 0:7ba80dad604c 50 * The SD SPI protocol is based on transactions made up of 8-bit words, with
gauthibit 0:7ba80dad604c 51 * the host starting every bus transaction by asserting the CS signal low. The
gauthibit 0:7ba80dad604c 52 * card always responds to commands, data blocks and errors.
gauthibit 0:7ba80dad604c 53 *
gauthibit 0:7ba80dad604c 54 * The protocol supports a CRC, but by default it is off (except for the
gauthibit 0:7ba80dad604c 55 * first reset CMD0, where the CRC can just be pre-calculated, and CMD8)
gauthibit 0:7ba80dad604c 56 * I'll leave the CRC off I think!
gauthibit 0:7ba80dad604c 57 *
gauthibit 0:7ba80dad604c 58 * Standard capacity cards have variable data block sizes, whereas High
gauthibit 0:7ba80dad604c 59 * Capacity cards fix the size of data block to 512 bytes. I'll therefore
gauthibit 0:7ba80dad604c 60 * just always use the Standard Capacity cards with a block size of 512 bytes.
gauthibit 0:7ba80dad604c 61 * This is set with CMD16.
gauthibit 0:7ba80dad604c 62 *
gauthibit 0:7ba80dad604c 63 * You can read and write single blocks (CMD17, CMD25) or multiple blocks
gauthibit 0:7ba80dad604c 64 * (CMD18, CMD25). For simplicity, I'll just use single block accesses. When
gauthibit 0:7ba80dad604c 65 * the card gets a read command, it responds with a response token, and then
gauthibit 0:7ba80dad604c 66 * a data token or an error.
gauthibit 0:7ba80dad604c 67 *
gauthibit 0:7ba80dad604c 68 * SPI Command Format
gauthibit 0:7ba80dad604c 69 * ------------------
gauthibit 0:7ba80dad604c 70 * Commands are 6-bytes long, containing the command, 32-bit argument, and CRC.
gauthibit 0:7ba80dad604c 71 *
gauthibit 0:7ba80dad604c 72 * +---------------+------------+------------+-----------+----------+--------------+
gauthibit 0:7ba80dad604c 73 * | 01 | cmd[5:0] | arg[31:24] | arg[23:16] | arg[15:8] | arg[7:0] | crc[6:0] | 1 |
gauthibit 0:7ba80dad604c 74 * +---------------+------------+------------+-----------+----------+--------------+
gauthibit 0:7ba80dad604c 75 *
gauthibit 0:7ba80dad604c 76 * As I'm not using CRC, I can fix that byte to what is needed for CMD0 (0x95)
gauthibit 0:7ba80dad604c 77 *
gauthibit 0:7ba80dad604c 78 * All Application Specific commands shall be preceded with APP_CMD (CMD55).
gauthibit 0:7ba80dad604c 79 *
gauthibit 0:7ba80dad604c 80 * SPI Response Format
gauthibit 0:7ba80dad604c 81 * -------------------
gauthibit 0:7ba80dad604c 82 * The main response format (R1) is a status byte (normally zero). Key flags:
gauthibit 0:7ba80dad604c 83 * idle - 1 if the card is in an idle state/initialising
gauthibit 0:7ba80dad604c 84 * cmd - 1 if an illegal command code was detected
gauthibit 0:7ba80dad604c 85 *
gauthibit 0:7ba80dad604c 86 * +-------------------------------------------------+
gauthibit 0:7ba80dad604c 87 * R1 | 0 | arg | addr | seq | crc | cmd | erase | idle |
gauthibit 0:7ba80dad604c 88 * +-------------------------------------------------+
gauthibit 0:7ba80dad604c 89 *
gauthibit 0:7ba80dad604c 90 * R1b is the same, except it is followed by a busy signal (zeros) until
gauthibit 0:7ba80dad604c 91 * the first non-zero byte when it is ready again.
gauthibit 0:7ba80dad604c 92 *
gauthibit 0:7ba80dad604c 93 * Data Response Token
gauthibit 0:7ba80dad604c 94 * -------------------
gauthibit 0:7ba80dad604c 95 * Every data block written to the card is acknowledged by a byte
gauthibit 0:7ba80dad604c 96 * response token
gauthibit 0:7ba80dad604c 97 *
gauthibit 0:7ba80dad604c 98 * +----------------------+
gauthibit 0:7ba80dad604c 99 * | xxx | 0 | status | 1 |
gauthibit 0:7ba80dad604c 100 * +----------------------+
gauthibit 0:7ba80dad604c 101 * 010 - OK!
gauthibit 0:7ba80dad604c 102 * 101 - CRC Error
gauthibit 0:7ba80dad604c 103 * 110 - Write Error
gauthibit 0:7ba80dad604c 104 *
gauthibit 0:7ba80dad604c 105 * Single Block Read and Write
gauthibit 0:7ba80dad604c 106 * ---------------------------
gauthibit 0:7ba80dad604c 107 *
gauthibit 0:7ba80dad604c 108 * Block transfers have a byte header, followed by the data, followed
gauthibit 0:7ba80dad604c 109 * by a 16-bit CRC. In our case, the data will always be 512 bytes.
gauthibit 0:7ba80dad604c 110 *
gauthibit 0:7ba80dad604c 111 * +------+---------+---------+- - - -+---------+-----------+----------+
gauthibit 0:7ba80dad604c 112 * | 0xFE | data[0] | data[1] | | data[n] | crc[15:8] | crc[7:0] |
gauthibit 0:7ba80dad604c 113 * +------+---------+---------+- - - -+---------+-----------+----------+
gauthibit 0:7ba80dad604c 114 */
gauthibit 0:7ba80dad604c 115 #include "SDFileSystem.h"
gauthibit 0:7ba80dad604c 116 #include "mbed_debug.h"
gauthibit 0:7ba80dad604c 117
gauthibit 0:7ba80dad604c 118 #define SD_COMMAND_TIMEOUT 5000
gauthibit 0:7ba80dad604c 119
gauthibit 0:7ba80dad604c 120 #define SD_DBG 0
gauthibit 0:7ba80dad604c 121
gauthibit 0:7ba80dad604c 122 SDFileSystem::SDFileSystem(PinName mosi, PinName miso, PinName sclk, PinName cs, const char* name) :
gauthibit 0:7ba80dad604c 123 FATFileSystem(name), _spi(mosi, miso, sclk), _cs(cs) {
gauthibit 0:7ba80dad604c 124 _cs = 1;
gauthibit 0:7ba80dad604c 125 }
gauthibit 0:7ba80dad604c 126
gauthibit 0:7ba80dad604c 127 #define R1_IDLE_STATE (1 << 0)
gauthibit 0:7ba80dad604c 128 #define R1_ERASE_RESET (1 << 1)
gauthibit 0:7ba80dad604c 129 #define R1_ILLEGAL_COMMAND (1 << 2)
gauthibit 0:7ba80dad604c 130 #define R1_COM_CRC_ERROR (1 << 3)
gauthibit 0:7ba80dad604c 131 #define R1_ERASE_SEQUENCE_ERROR (1 << 4)
gauthibit 0:7ba80dad604c 132 #define R1_ADDRESS_ERROR (1 << 5)
gauthibit 0:7ba80dad604c 133 #define R1_PARAMETER_ERROR (1 << 6)
gauthibit 0:7ba80dad604c 134
gauthibit 0:7ba80dad604c 135 // Types
gauthibit 0:7ba80dad604c 136 // - v1.x Standard Capacity
gauthibit 0:7ba80dad604c 137 // - v2.x Standard Capacity
gauthibit 0:7ba80dad604c 138 // - v2.x High Capacity
gauthibit 0:7ba80dad604c 139 // - Not recognised as an SD Card
gauthibit 0:7ba80dad604c 140 #define SDCARD_FAIL 0
gauthibit 0:7ba80dad604c 141 #define SDCARD_V1 1
gauthibit 0:7ba80dad604c 142 #define SDCARD_V2 2
gauthibit 0:7ba80dad604c 143 #define SDCARD_V2HC 3
gauthibit 0:7ba80dad604c 144
gauthibit 0:7ba80dad604c 145 int SDFileSystem::initialise_card() {
gauthibit 0:7ba80dad604c 146 // Set to 100kHz for initialisation, and clock card with cs = 1
gauthibit 0:7ba80dad604c 147 _spi.frequency(100000);
gauthibit 0:7ba80dad604c 148 _cs = 1;
gauthibit 0:7ba80dad604c 149 for (int i = 0; i < 16; i++) {
gauthibit 0:7ba80dad604c 150 _spi.write(0xFF);
gauthibit 0:7ba80dad604c 151 }
gauthibit 0:7ba80dad604c 152
gauthibit 0:7ba80dad604c 153 // send CMD0, should return with all zeros except IDLE STATE set (bit 0)
gauthibit 0:7ba80dad604c 154 if (_cmd(0, 0) != R1_IDLE_STATE) {
gauthibit 0:7ba80dad604c 155 debug("No disk, or could not put SD card in to SPI idle state\n");
gauthibit 0:7ba80dad604c 156 return SDCARD_FAIL;
gauthibit 0:7ba80dad604c 157 }
gauthibit 0:7ba80dad604c 158
gauthibit 0:7ba80dad604c 159 // send CMD8 to determine whther it is ver 2.x
gauthibit 0:7ba80dad604c 160 int r = _cmd8();
gauthibit 0:7ba80dad604c 161 if (r == R1_IDLE_STATE) {
gauthibit 0:7ba80dad604c 162 return initialise_card_v2();
gauthibit 0:7ba80dad604c 163 } else if (r == (R1_IDLE_STATE | R1_ILLEGAL_COMMAND)) {
gauthibit 0:7ba80dad604c 164 return initialise_card_v1();
gauthibit 0:7ba80dad604c 165 } else {
gauthibit 0:7ba80dad604c 166 debug("Not in idle state after sending CMD8 (not an SD card?)\n");
gauthibit 0:7ba80dad604c 167 return SDCARD_FAIL;
gauthibit 0:7ba80dad604c 168 }
gauthibit 0:7ba80dad604c 169 }
gauthibit 0:7ba80dad604c 170
gauthibit 0:7ba80dad604c 171 int SDFileSystem::initialise_card_v1() {
gauthibit 0:7ba80dad604c 172 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
gauthibit 0:7ba80dad604c 173 _cmd(55, 0);
gauthibit 0:7ba80dad604c 174 if (_cmd(41, 0) == 0) {
gauthibit 0:7ba80dad604c 175 cdv = 512;
gauthibit 0:7ba80dad604c 176 debug_if(SD_DBG, "\n\rInit: SEDCARD_V1\n\r");
gauthibit 0:7ba80dad604c 177 return SDCARD_V1;
gauthibit 0:7ba80dad604c 178 }
gauthibit 0:7ba80dad604c 179 }
gauthibit 0:7ba80dad604c 180
gauthibit 0:7ba80dad604c 181 debug("Timeout waiting for v1.x card\n");
gauthibit 0:7ba80dad604c 182 return SDCARD_FAIL;
gauthibit 0:7ba80dad604c 183 }
gauthibit 0:7ba80dad604c 184
gauthibit 0:7ba80dad604c 185 int SDFileSystem::initialise_card_v2() {
gauthibit 0:7ba80dad604c 186 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
gauthibit 0:7ba80dad604c 187 wait_ms(50);
gauthibit 0:7ba80dad604c 188 _cmd58();
gauthibit 0:7ba80dad604c 189 _cmd(55, 0);
gauthibit 0:7ba80dad604c 190 if (_cmd(41, 0x40000000) == 0) {
gauthibit 0:7ba80dad604c 191 _cmd58();
gauthibit 0:7ba80dad604c 192 debug_if(SD_DBG, "\n\rInit: SDCARD_V2\n\r");
gauthibit 0:7ba80dad604c 193 cdv = 1;
gauthibit 0:7ba80dad604c 194 return SDCARD_V2;
gauthibit 0:7ba80dad604c 195 }
gauthibit 0:7ba80dad604c 196 }
gauthibit 0:7ba80dad604c 197
gauthibit 0:7ba80dad604c 198 debug("Timeout waiting for v2.x card\n");
gauthibit 0:7ba80dad604c 199 return SDCARD_FAIL;
gauthibit 0:7ba80dad604c 200 }
gauthibit 0:7ba80dad604c 201
gauthibit 0:7ba80dad604c 202 int SDFileSystem::disk_initialize() {
gauthibit 0:7ba80dad604c 203 int i = initialise_card();
gauthibit 0:7ba80dad604c 204 debug_if(SD_DBG, "init card = %d\n", i);
gauthibit 0:7ba80dad604c 205 _sectors = _sd_sectors();
gauthibit 0:7ba80dad604c 206
gauthibit 0:7ba80dad604c 207 // Set block length to 512 (CMD16)
gauthibit 0:7ba80dad604c 208 if (_cmd(16, 512) != 0) {
gauthibit 0:7ba80dad604c 209 debug("Set 512-byte block timed out\n");
gauthibit 0:7ba80dad604c 210 return 1;
gauthibit 0:7ba80dad604c 211 }
gauthibit 0:7ba80dad604c 212
gauthibit 0:7ba80dad604c 213 _spi.frequency(1000000); // Set to 1MHz for data transfer
gauthibit 0:7ba80dad604c 214 return 0;
gauthibit 0:7ba80dad604c 215 }
gauthibit 0:7ba80dad604c 216
gauthibit 0:7ba80dad604c 217 int SDFileSystem::disk_write(const uint8_t *buffer, uint64_t block_number) {
gauthibit 0:7ba80dad604c 218 // set write address for single block (CMD24)
gauthibit 0:7ba80dad604c 219 if (_cmd(24, block_number * cdv) != 0) {
gauthibit 0:7ba80dad604c 220 return 1;
gauthibit 0:7ba80dad604c 221 }
gauthibit 0:7ba80dad604c 222
gauthibit 0:7ba80dad604c 223 // send the data block
gauthibit 0:7ba80dad604c 224 _write(buffer, 512);
gauthibit 0:7ba80dad604c 225 return 0;
gauthibit 0:7ba80dad604c 226 }
gauthibit 0:7ba80dad604c 227
gauthibit 0:7ba80dad604c 228 int SDFileSystem::disk_read(uint8_t *buffer, uint64_t block_number) {
gauthibit 0:7ba80dad604c 229 // set read address for single block (CMD17)
gauthibit 0:7ba80dad604c 230 if (_cmd(17, block_number * cdv) != 0) {
gauthibit 0:7ba80dad604c 231 return 1;
gauthibit 0:7ba80dad604c 232 }
gauthibit 0:7ba80dad604c 233
gauthibit 0:7ba80dad604c 234 // receive the data
gauthibit 0:7ba80dad604c 235 _read(buffer, 512);
gauthibit 0:7ba80dad604c 236 return 0;
gauthibit 0:7ba80dad604c 237 }
gauthibit 0:7ba80dad604c 238
gauthibit 0:7ba80dad604c 239 int SDFileSystem::disk_status() { return 0; }
gauthibit 0:7ba80dad604c 240 int SDFileSystem::disk_sync() { return 0; }
gauthibit 0:7ba80dad604c 241 uint64_t SDFileSystem::disk_sectors() { return _sectors; }
gauthibit 0:7ba80dad604c 242
gauthibit 0:7ba80dad604c 243
gauthibit 0:7ba80dad604c 244 // PRIVATE FUNCTIONS
gauthibit 0:7ba80dad604c 245 int SDFileSystem::_cmd(int cmd, int arg) {
gauthibit 0:7ba80dad604c 246 _cs = 0;
gauthibit 0:7ba80dad604c 247
gauthibit 0:7ba80dad604c 248 // send a command
gauthibit 0:7ba80dad604c 249 _spi.write(0x40 | cmd);
gauthibit 0:7ba80dad604c 250 _spi.write(arg >> 24);
gauthibit 0:7ba80dad604c 251 _spi.write(arg >> 16);
gauthibit 0:7ba80dad604c 252 _spi.write(arg >> 8);
gauthibit 0:7ba80dad604c 253 _spi.write(arg >> 0);
gauthibit 0:7ba80dad604c 254 _spi.write(0x95);
gauthibit 0:7ba80dad604c 255
gauthibit 0:7ba80dad604c 256 // wait for the repsonse (response[7] == 0)
gauthibit 0:7ba80dad604c 257 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
gauthibit 0:7ba80dad604c 258 int response = _spi.write(0xFF);
gauthibit 0:7ba80dad604c 259 if (!(response & 0x80)) {
gauthibit 0:7ba80dad604c 260 _cs = 1;
gauthibit 0:7ba80dad604c 261 _spi.write(0xFF);
gauthibit 0:7ba80dad604c 262 return response;
gauthibit 0:7ba80dad604c 263 }
gauthibit 0:7ba80dad604c 264 }
gauthibit 0:7ba80dad604c 265 _cs = 1;
gauthibit 0:7ba80dad604c 266 _spi.write(0xFF);
gauthibit 0:7ba80dad604c 267 return -1; // timeout
gauthibit 0:7ba80dad604c 268 }
gauthibit 0:7ba80dad604c 269 int SDFileSystem::_cmdx(int cmd, int arg) {
gauthibit 0:7ba80dad604c 270 _cs = 0;
gauthibit 0:7ba80dad604c 271
gauthibit 0:7ba80dad604c 272 // send a command
gauthibit 0:7ba80dad604c 273 _spi.write(0x40 | cmd);
gauthibit 0:7ba80dad604c 274 _spi.write(arg >> 24);
gauthibit 0:7ba80dad604c 275 _spi.write(arg >> 16);
gauthibit 0:7ba80dad604c 276 _spi.write(arg >> 8);
gauthibit 0:7ba80dad604c 277 _spi.write(arg >> 0);
gauthibit 0:7ba80dad604c 278 _spi.write(0x95);
gauthibit 0:7ba80dad604c 279
gauthibit 0:7ba80dad604c 280 // wait for the repsonse (response[7] == 0)
gauthibit 0:7ba80dad604c 281 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
gauthibit 0:7ba80dad604c 282 int response = _spi.write(0xFF);
gauthibit 0:7ba80dad604c 283 if (!(response & 0x80)) {
gauthibit 0:7ba80dad604c 284 return response;
gauthibit 0:7ba80dad604c 285 }
gauthibit 0:7ba80dad604c 286 }
gauthibit 0:7ba80dad604c 287 _cs = 1;
gauthibit 0:7ba80dad604c 288 _spi.write(0xFF);
gauthibit 0:7ba80dad604c 289 return -1; // timeout
gauthibit 0:7ba80dad604c 290 }
gauthibit 0:7ba80dad604c 291
gauthibit 0:7ba80dad604c 292
gauthibit 0:7ba80dad604c 293 int SDFileSystem::_cmd58() {
gauthibit 0:7ba80dad604c 294 _cs = 0;
gauthibit 0:7ba80dad604c 295 int arg = 0;
gauthibit 0:7ba80dad604c 296
gauthibit 0:7ba80dad604c 297 // send a command
gauthibit 0:7ba80dad604c 298 _spi.write(0x40 | 58);
gauthibit 0:7ba80dad604c 299 _spi.write(arg >> 24);
gauthibit 0:7ba80dad604c 300 _spi.write(arg >> 16);
gauthibit 0:7ba80dad604c 301 _spi.write(arg >> 8);
gauthibit 0:7ba80dad604c 302 _spi.write(arg >> 0);
gauthibit 0:7ba80dad604c 303 _spi.write(0x95);
gauthibit 0:7ba80dad604c 304
gauthibit 0:7ba80dad604c 305 // wait for the repsonse (response[7] == 0)
gauthibit 0:7ba80dad604c 306 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
gauthibit 0:7ba80dad604c 307 int response = _spi.write(0xFF);
gauthibit 0:7ba80dad604c 308 if (!(response & 0x80)) {
gauthibit 0:7ba80dad604c 309 int ocr = _spi.write(0xFF) << 24;
gauthibit 0:7ba80dad604c 310 ocr |= _spi.write(0xFF) << 16;
gauthibit 0:7ba80dad604c 311 ocr |= _spi.write(0xFF) << 8;
gauthibit 0:7ba80dad604c 312 ocr |= _spi.write(0xFF) << 0;
gauthibit 0:7ba80dad604c 313 _cs = 1;
gauthibit 0:7ba80dad604c 314 _spi.write(0xFF);
gauthibit 0:7ba80dad604c 315 return response;
gauthibit 0:7ba80dad604c 316 }
gauthibit 0:7ba80dad604c 317 }
gauthibit 0:7ba80dad604c 318 _cs = 1;
gauthibit 0:7ba80dad604c 319 _spi.write(0xFF);
gauthibit 0:7ba80dad604c 320 return -1; // timeout
gauthibit 0:7ba80dad604c 321 }
gauthibit 0:7ba80dad604c 322
gauthibit 0:7ba80dad604c 323 int SDFileSystem::_cmd8() {
gauthibit 0:7ba80dad604c 324 _cs = 0;
gauthibit 0:7ba80dad604c 325
gauthibit 0:7ba80dad604c 326 // send a command
gauthibit 0:7ba80dad604c 327 _spi.write(0x40 | 8); // CMD8
gauthibit 0:7ba80dad604c 328 _spi.write(0x00); // reserved
gauthibit 0:7ba80dad604c 329 _spi.write(0x00); // reserved
gauthibit 0:7ba80dad604c 330 _spi.write(0x01); // 3.3v
gauthibit 0:7ba80dad604c 331 _spi.write(0xAA); // check pattern
gauthibit 0:7ba80dad604c 332 _spi.write(0x87); // crc
gauthibit 0:7ba80dad604c 333
gauthibit 0:7ba80dad604c 334 // wait for the repsonse (response[7] == 0)
gauthibit 0:7ba80dad604c 335 for (int i = 0; i < SD_COMMAND_TIMEOUT * 1000; i++) {
gauthibit 0:7ba80dad604c 336 char response[5];
gauthibit 0:7ba80dad604c 337 response[0] = _spi.write(0xFF);
gauthibit 0:7ba80dad604c 338 if (!(response[0] & 0x80)) {
gauthibit 0:7ba80dad604c 339 for (int j = 1; j < 5; j++) {
gauthibit 0:7ba80dad604c 340 response[i] = _spi.write(0xFF);
gauthibit 0:7ba80dad604c 341 }
gauthibit 0:7ba80dad604c 342 _cs = 1;
gauthibit 0:7ba80dad604c 343 _spi.write(0xFF);
gauthibit 0:7ba80dad604c 344 return response[0];
gauthibit 0:7ba80dad604c 345 }
gauthibit 0:7ba80dad604c 346 }
gauthibit 0:7ba80dad604c 347 _cs = 1;
gauthibit 0:7ba80dad604c 348 _spi.write(0xFF);
gauthibit 0:7ba80dad604c 349 return -1; // timeout
gauthibit 0:7ba80dad604c 350 }
gauthibit 0:7ba80dad604c 351
gauthibit 0:7ba80dad604c 352 int SDFileSystem::_read(uint8_t *buffer, uint32_t length) {
gauthibit 0:7ba80dad604c 353 _cs = 0;
gauthibit 0:7ba80dad604c 354
gauthibit 0:7ba80dad604c 355 // read until start byte (0xFF)
gauthibit 0:7ba80dad604c 356 while (_spi.write(0xFF) != 0xFE);
gauthibit 0:7ba80dad604c 357
gauthibit 0:7ba80dad604c 358 // read data
gauthibit 0:7ba80dad604c 359 for (int i = 0; i < length; i++) {
gauthibit 0:7ba80dad604c 360 buffer[i] = _spi.write(0xFF);
gauthibit 0:7ba80dad604c 361 }
gauthibit 0:7ba80dad604c 362 _spi.write(0xFF); // checksum
gauthibit 0:7ba80dad604c 363 _spi.write(0xFF);
gauthibit 0:7ba80dad604c 364
gauthibit 0:7ba80dad604c 365 _cs = 1;
gauthibit 0:7ba80dad604c 366 _spi.write(0xFF);
gauthibit 0:7ba80dad604c 367 return 0;
gauthibit 0:7ba80dad604c 368 }
gauthibit 0:7ba80dad604c 369
gauthibit 0:7ba80dad604c 370 int SDFileSystem::_write(const uint8_t*buffer, uint32_t length) {
gauthibit 0:7ba80dad604c 371 _cs = 0;
gauthibit 0:7ba80dad604c 372
gauthibit 0:7ba80dad604c 373 // indicate start of block
gauthibit 0:7ba80dad604c 374 _spi.write(0xFE);
gauthibit 0:7ba80dad604c 375
gauthibit 0:7ba80dad604c 376 // write the data
gauthibit 0:7ba80dad604c 377 for (int i = 0; i < length; i++) {
gauthibit 0:7ba80dad604c 378 _spi.write(buffer[i]);
gauthibit 0:7ba80dad604c 379 }
gauthibit 0:7ba80dad604c 380
gauthibit 0:7ba80dad604c 381 // write the checksum
gauthibit 0:7ba80dad604c 382 _spi.write(0xFF);
gauthibit 0:7ba80dad604c 383 _spi.write(0xFF);
gauthibit 0:7ba80dad604c 384
gauthibit 0:7ba80dad604c 385 // check the response token
gauthibit 0:7ba80dad604c 386 if ((_spi.write(0xFF) & 0x1F) != 0x05) {
gauthibit 0:7ba80dad604c 387 _cs = 1;
gauthibit 0:7ba80dad604c 388 _spi.write(0xFF);
gauthibit 0:7ba80dad604c 389 return 1;
gauthibit 0:7ba80dad604c 390 }
gauthibit 0:7ba80dad604c 391
gauthibit 0:7ba80dad604c 392 // wait for write to finish
gauthibit 0:7ba80dad604c 393 while (_spi.write(0xFF) == 0);
gauthibit 0:7ba80dad604c 394
gauthibit 0:7ba80dad604c 395 _cs = 1;
gauthibit 0:7ba80dad604c 396 _spi.write(0xFF);
gauthibit 0:7ba80dad604c 397 return 0;
gauthibit 0:7ba80dad604c 398 }
gauthibit 0:7ba80dad604c 399
gauthibit 0:7ba80dad604c 400 static uint32_t ext_bits(unsigned char *data, int msb, int lsb) {
gauthibit 0:7ba80dad604c 401 uint32_t bits = 0;
gauthibit 0:7ba80dad604c 402 uint32_t size = 1 + msb - lsb;
gauthibit 0:7ba80dad604c 403 for (int i = 0; i < size; i++) {
gauthibit 0:7ba80dad604c 404 uint32_t position = lsb + i;
gauthibit 0:7ba80dad604c 405 uint32_t byte = 15 - (position >> 3);
gauthibit 0:7ba80dad604c 406 uint32_t bit = position & 0x7;
gauthibit 0:7ba80dad604c 407 uint32_t value = (data[byte] >> bit) & 1;
gauthibit 0:7ba80dad604c 408 bits |= value << i;
gauthibit 0:7ba80dad604c 409 }
gauthibit 0:7ba80dad604c 410 return bits;
gauthibit 0:7ba80dad604c 411 }
gauthibit 0:7ba80dad604c 412
gauthibit 0:7ba80dad604c 413 uint64_t SDFileSystem::_sd_sectors() {
gauthibit 0:7ba80dad604c 414 uint32_t c_size, c_size_mult, read_bl_len;
gauthibit 0:7ba80dad604c 415 uint32_t block_len, mult, blocknr, capacity;
gauthibit 0:7ba80dad604c 416 uint32_t hc_c_size;
gauthibit 0:7ba80dad604c 417 uint64_t blocks;
gauthibit 0:7ba80dad604c 418
gauthibit 0:7ba80dad604c 419 // CMD9, Response R2 (R1 byte + 16-byte block read)
gauthibit 0:7ba80dad604c 420 if (_cmdx(9, 0) != 0) {
gauthibit 0:7ba80dad604c 421 debug("Didn't get a response from the disk\n");
gauthibit 0:7ba80dad604c 422 return 0;
gauthibit 0:7ba80dad604c 423 }
gauthibit 0:7ba80dad604c 424
gauthibit 0:7ba80dad604c 425 uint8_t csd[16];
gauthibit 0:7ba80dad604c 426 if (_read(csd, 16) != 0) {
gauthibit 0:7ba80dad604c 427 debug("Couldn't read csd response from disk\n");
gauthibit 0:7ba80dad604c 428 return 0;
gauthibit 0:7ba80dad604c 429 }
gauthibit 0:7ba80dad604c 430
gauthibit 0:7ba80dad604c 431 // csd_structure : csd[127:126]
gauthibit 0:7ba80dad604c 432 // c_size : csd[73:62]
gauthibit 0:7ba80dad604c 433 // c_size_mult : csd[49:47]
gauthibit 0:7ba80dad604c 434 // read_bl_len : csd[83:80] - the *maximum* read block length
gauthibit 0:7ba80dad604c 435
gauthibit 0:7ba80dad604c 436 int csd_structure = ext_bits(csd, 127, 126);
gauthibit 0:7ba80dad604c 437
gauthibit 0:7ba80dad604c 438 switch (csd_structure) {
gauthibit 0:7ba80dad604c 439 case 0:
gauthibit 0:7ba80dad604c 440 cdv = 512;
gauthibit 0:7ba80dad604c 441 c_size = ext_bits(csd, 73, 62);
gauthibit 0:7ba80dad604c 442 c_size_mult = ext_bits(csd, 49, 47);
gauthibit 0:7ba80dad604c 443 read_bl_len = ext_bits(csd, 83, 80);
gauthibit 0:7ba80dad604c 444
gauthibit 0:7ba80dad604c 445 block_len = 1 << read_bl_len;
gauthibit 0:7ba80dad604c 446 mult = 1 << (c_size_mult + 2);
gauthibit 0:7ba80dad604c 447 blocknr = (c_size + 1) * mult;
gauthibit 0:7ba80dad604c 448 capacity = blocknr * block_len;
gauthibit 0:7ba80dad604c 449 blocks = capacity / 512;
gauthibit 0:7ba80dad604c 450 debug_if(SD_DBG, "\n\rSDCard\n\rc_size: %d \n\rcapacity: %ld \n\rsectors: %lld\n\r", c_size, capacity, blocks);
gauthibit 0:7ba80dad604c 451 break;
gauthibit 0:7ba80dad604c 452
gauthibit 0:7ba80dad604c 453 case 1:
gauthibit 0:7ba80dad604c 454 cdv = 1;
gauthibit 0:7ba80dad604c 455 hc_c_size = ext_bits(csd, 63, 48);
gauthibit 0:7ba80dad604c 456 blocks = (hc_c_size+1)*1024;
gauthibit 0:7ba80dad604c 457 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);
gauthibit 0:7ba80dad604c 458 break;
gauthibit 0:7ba80dad604c 459
gauthibit 0:7ba80dad604c 460 default:
gauthibit 0:7ba80dad604c 461 debug("CSD struct unsupported\r\n");
gauthibit 0:7ba80dad604c 462 return 0;
gauthibit 0:7ba80dad604c 463 };
gauthibit 0:7ba80dad604c 464 return blocks;
gauthibit 0:7ba80dad604c 465 }