James Heavey / Mbed 2 deprecated EL17JH

FINAL VERSION

Dependencies:   mbed

SDFileSystem/SDFileSystem.cpp@140:d8634e76ecce, 2019-05-09 (annotated)

Committer:
jamesheavey
Date:
Thu May 09 14:36:51 2019 +0000
Revision:
140:d8634e76ecce
Parent:
101:0df767523dbd 
Final Submission. I have read and agreed with Statement of Academic Integrity.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jamesheavey 101:0df767523dbd 1 /* mbed Microcontroller Library
jamesheavey 101:0df767523dbd 2 * Copyright (c) 2006-2012 ARM Limited
jamesheavey 101:0df767523dbd 3 *
jamesheavey 101:0df767523dbd 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
jamesheavey 101:0df767523dbd 5 * of this software and associated documentation files (the "Software"), to deal
jamesheavey 101:0df767523dbd 6 * in the Software without restriction, including without limitation the rights
jamesheavey 101:0df767523dbd 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
jamesheavey 101:0df767523dbd 8 * copies of the Software, and to permit persons to whom the Software is
jamesheavey 101:0df767523dbd 9 * furnished to do so, subject to the following conditions:
jamesheavey 101:0df767523dbd 10 *
jamesheavey 101:0df767523dbd 11 * The above copyright notice and this permission notice shall be included in
jamesheavey 101:0df767523dbd 12 * all copies or substantial portions of the Software.
jamesheavey 101:0df767523dbd 13 *
jamesheavey 101:0df767523dbd 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
jamesheavey 101:0df767523dbd 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
jamesheavey 101:0df767523dbd 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
jamesheavey 101:0df767523dbd 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
jamesheavey 101:0df767523dbd 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
jamesheavey 101:0df767523dbd 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
jamesheavey 101:0df767523dbd 20 * SOFTWARE.
jamesheavey 101:0df767523dbd 21 */
jamesheavey 101:0df767523dbd 22 /* Introduction
jamesheavey 101:0df767523dbd 23 * ------------
jamesheavey 101:0df767523dbd 24 * SD and MMC cards support a number of interfaces, but common to them all
jamesheavey 101:0df767523dbd 25 * is one based on SPI. This is the one I'm implmenting because it means
jamesheavey 101:0df767523dbd 26 * it is much more portable even though not so performant, and we already
jamesheavey 101:0df767523dbd 27 * have the mbed SPI Interface!
jamesheavey 101:0df767523dbd 28 *
jamesheavey 101:0df767523dbd 29 * The main reference I'm using is Chapter 7, "SPI Mode" of:
jamesheavey 101:0df767523dbd 30 * http://www.sdcard.org/developers/tech/sdcard/pls/Simplified_Physical_Layer_Spec.pdf
jamesheavey 101:0df767523dbd 31 *
jamesheavey 101:0df767523dbd 32 * SPI Startup
jamesheavey 101:0df767523dbd 33 * -----------
jamesheavey 101:0df767523dbd 34 * The SD card powers up in SD mode. The SPI interface mode is selected by
jamesheavey 101:0df767523dbd 35 * asserting CS low and sending the reset command (CMD0). The card will
jamesheavey 101:0df767523dbd 36 * respond with a (R1) response.
jamesheavey 101:0df767523dbd 37 *
jamesheavey 101:0df767523dbd 38 * CMD8 is optionally sent to determine the voltage range supported, and
jamesheavey 101:0df767523dbd 39 * indirectly determine whether it is a version 1.x SD/non-SD card or
jamesheavey 101:0df767523dbd 40 * version 2.x. I'll just ignore this for now.
jamesheavey 101:0df767523dbd 41 *
jamesheavey 101:0df767523dbd 42 * ACMD41 is repeatedly issued to initialise the card, until "in idle"
jamesheavey 101:0df767523dbd 43 * (bit 0) of the R1 response goes to '0', indicating it is initialised.
jamesheavey 101:0df767523dbd 44 *
jamesheavey 101:0df767523dbd 45 * You should also indicate whether the host supports High Capicity cards,
jamesheavey 101:0df767523dbd 46 * and check whether the card is high capacity - i'll also ignore this
jamesheavey 101:0df767523dbd 47 *
jamesheavey 101:0df767523dbd 48 * SPI Protocol
jamesheavey 101:0df767523dbd 49 * ------------
jamesheavey 101:0df767523dbd 50 * The SD SPI protocol is based on transactions made up of 8-bit words, with
jamesheavey 101:0df767523dbd 51 * the host starting every bus transaction by asserting the CS signal low. The
jamesheavey 101:0df767523dbd 52 * card always responds to commands, data blocks and errors.
jamesheavey 101:0df767523dbd 53 *
jamesheavey 101:0df767523dbd 54 * The protocol supports a CRC, but by default it is off (except for the
jamesheavey 101:0df767523dbd 55 * first reset CMD0, where the CRC can just be pre-calculated, and CMD8)
jamesheavey 101:0df767523dbd 56 * I'll leave the CRC off I think!
jamesheavey 101:0df767523dbd 57 *
jamesheavey 101:0df767523dbd 58 * Standard capacity cards have variable data block sizes, whereas High
jamesheavey 101:0df767523dbd 59 * Capacity cards fix the size of data block to 512 bytes. I'll therefore
jamesheavey 101:0df767523dbd 60 * just always use the Standard Capacity cards with a block size of 512 bytes.
jamesheavey 101:0df767523dbd 61 * This is set with CMD16.
jamesheavey 101:0df767523dbd 62 *
jamesheavey 101:0df767523dbd 63 * You can read and write single blocks (CMD17, CMD25) or multiple blocks
jamesheavey 101:0df767523dbd 64 * (CMD18, CMD25). For simplicity, I'll just use single block accesses. When
jamesheavey 101:0df767523dbd 65 * the card gets a read command, it responds with a response token, and then
jamesheavey 101:0df767523dbd 66 * a data token or an error.
jamesheavey 101:0df767523dbd 67 *
jamesheavey 101:0df767523dbd 68 * SPI Command Format
jamesheavey 101:0df767523dbd 69 * ------------------
jamesheavey 101:0df767523dbd 70 * Commands are 6-bytes long, containing the command, 32-bit argument, and CRC.
jamesheavey 101:0df767523dbd 71 *
jamesheavey 101:0df767523dbd 72 * +---------------+------------+------------+-----------+----------+--------------+
jamesheavey 101:0df767523dbd 73 * | 01 | cmd[5:0] | arg[31:24] | arg[23:16] | arg[15:8] | arg[7:0] | crc[6:0] | 1 |
jamesheavey 101:0df767523dbd 74 * +---------------+------------+------------+-----------+----------+--------------+
jamesheavey 101:0df767523dbd 75 *
jamesheavey 101:0df767523dbd 76 * As I'm not using CRC, I can fix that byte to what is needed for CMD0 (0x95)
jamesheavey 101:0df767523dbd 77 *
jamesheavey 101:0df767523dbd 78 * All Application Specific commands shall be preceded with APP_CMD (CMD55).
jamesheavey 101:0df767523dbd 79 *
jamesheavey 101:0df767523dbd 80 * SPI Response Format
jamesheavey 101:0df767523dbd 81 * -------------------
jamesheavey 101:0df767523dbd 82 * The main response format (R1) is a status byte (normally zero). Key flags:
jamesheavey 101:0df767523dbd 83 * idle - 1 if the card is in an idle state/initialising
jamesheavey 101:0df767523dbd 84 * cmd - 1 if an illegal command code was detected
jamesheavey 101:0df767523dbd 85 *
jamesheavey 101:0df767523dbd 86 * +-------------------------------------------------+
jamesheavey 101:0df767523dbd 87 * R1 | 0 | arg | addr | seq | crc | cmd | erase | idle |
jamesheavey 101:0df767523dbd 88 * +-------------------------------------------------+
jamesheavey 101:0df767523dbd 89 *
jamesheavey 101:0df767523dbd 90 * R1b is the same, except it is followed by a busy signal (zeros) until
jamesheavey 101:0df767523dbd 91 * the first non-zero byte when it is ready again.
jamesheavey 101:0df767523dbd 92 *
jamesheavey 101:0df767523dbd 93 * Data Response Token
jamesheavey 101:0df767523dbd 94 * -------------------
jamesheavey 101:0df767523dbd 95 * Every data block written to the card is acknowledged by a byte
jamesheavey 101:0df767523dbd 96 * response token
jamesheavey 101:0df767523dbd 97 *
jamesheavey 101:0df767523dbd 98 * +----------------------+
jamesheavey 101:0df767523dbd 99 * | xxx | 0 | status | 1 |
jamesheavey 101:0df767523dbd 100 * +----------------------+
jamesheavey 101:0df767523dbd 101 * 010 - OK!
jamesheavey 101:0df767523dbd 102 * 101 - CRC Error
jamesheavey 101:0df767523dbd 103 * 110 - Write Error
jamesheavey 101:0df767523dbd 104 *
jamesheavey 101:0df767523dbd 105 * Single Block Read and Write
jamesheavey 101:0df767523dbd 106 * ---------------------------
jamesheavey 101:0df767523dbd 107 *
jamesheavey 101:0df767523dbd 108 * Block transfers have a byte header, followed by the data, followed
jamesheavey 101:0df767523dbd 109 * by a 16-bit CRC. In our case, the data will always be 512 bytes.
jamesheavey 101:0df767523dbd 110 *
jamesheavey 101:0df767523dbd 111 * +------+---------+---------+- - - -+---------+-----------+----------+
jamesheavey 101:0df767523dbd 112 * | 0xFE | data[0] | data[1] | | data[n] | crc[15:8] | crc[7:0] |
jamesheavey 101:0df767523dbd 113 * +------+---------+---------+- - - -+---------+-----------+----------+
jamesheavey 101:0df767523dbd 114 */
jamesheavey 101:0df767523dbd 115 #include "SDFileSystem.h"
jamesheavey 101:0df767523dbd 116 #include "mbed_debug.h"
jamesheavey 101:0df767523dbd 117
jamesheavey 101:0df767523dbd 118 #define SD_COMMAND_TIMEOUT 5000
jamesheavey 101:0df767523dbd 119
jamesheavey 101:0df767523dbd 120 #define SD_DBG 0
jamesheavey 101:0df767523dbd 121
jamesheavey 101:0df767523dbd 122 SDFileSystem::SDFileSystem(PinName mosi, PinName miso, PinName sclk, PinName cs, const char* name) :
jamesheavey 101:0df767523dbd 123 FATFileSystem(name), _spi(mosi, miso, sclk), _cs(cs), _is_initialized(0) {
jamesheavey 101:0df767523dbd 124 _cs = 1;
jamesheavey 101:0df767523dbd 125
jamesheavey 101:0df767523dbd 126 // Set default to 100kHz for initialisation and 1MHz for data transfer
jamesheavey 101:0df767523dbd 127 _init_sck = 100000;
jamesheavey 101:0df767523dbd 128 _transfer_sck = 1000000;
jamesheavey 101:0df767523dbd 129 }
jamesheavey 101:0df767523dbd 130
jamesheavey 101:0df767523dbd 131 #define R1_IDLE_STATE (1 << 0)
jamesheavey 101:0df767523dbd 132 #define R1_ERASE_RESET (1 << 1)
jamesheavey 101:0df767523dbd 133 #define R1_ILLEGAL_COMMAND (1 << 2)
jamesheavey 101:0df767523dbd 134 #define R1_COM_CRC_ERROR (1 << 3)
jamesheavey 101:0df767523dbd 135 #define R1_ERASE_SEQUENCE_ERROR (1 << 4)
jamesheavey 101:0df767523dbd 136 #define R1_ADDRESS_ERROR (1 << 5)
jamesheavey 101:0df767523dbd 137 #define R1_PARAMETER_ERROR (1 << 6)
jamesheavey 101:0df767523dbd 138
jamesheavey 101:0df767523dbd 139 // Types
jamesheavey 101:0df767523dbd 140 // - v1.x Standard Capacity
jamesheavey 101:0df767523dbd 141 // - v2.x Standard Capacity
jamesheavey 101:0df767523dbd 142 // - v2.x High Capacity
jamesheavey 101:0df767523dbd 143 // - Not recognised as an SD Card
jamesheavey 101:0df767523dbd 144 #define SDCARD_FAIL 0
jamesheavey 101:0df767523dbd 145 #define SDCARD_V1 1
jamesheavey 101:0df767523dbd 146 #define SDCARD_V2 2
jamesheavey 101:0df767523dbd 147 #define SDCARD_V2HC 3
jamesheavey 101:0df767523dbd 148
jamesheavey 101:0df767523dbd 149 int SDFileSystem::initialise_card() {
jamesheavey 101:0df767523dbd 150 // Set to SCK for initialisation, and clock card with cs = 1
jamesheavey 101:0df767523dbd 151 _spi.frequency(_init_sck);
jamesheavey 101:0df767523dbd 152 _cs = 1;
jamesheavey 101:0df767523dbd 153 for (int i = 0; i < 16; i++) {
jamesheavey 101:0df767523dbd 154 _spi.write(0xFF);
jamesheavey 101:0df767523dbd 155 }
jamesheavey 101:0df767523dbd 156
jamesheavey 101:0df767523dbd 157 // send CMD0, should return with all zeros except IDLE STATE set (bit 0)
jamesheavey 101:0df767523dbd 158 if (_cmd(0, 0) != R1_IDLE_STATE) {
jamesheavey 101:0df767523dbd 159 debug("No disk, or could not put SD card in to SPI idle state\n");
jamesheavey 101:0df767523dbd 160 return SDCARD_FAIL;
jamesheavey 101:0df767523dbd 161 }
jamesheavey 101:0df767523dbd 162
jamesheavey 101:0df767523dbd 163 // send CMD8 to determine whther it is ver 2.x
jamesheavey 101:0df767523dbd 164 int r = _cmd8();
jamesheavey 101:0df767523dbd 165 if (r == R1_IDLE_STATE) {
jamesheavey 101:0df767523dbd 166 return initialise_card_v2();
jamesheavey 101:0df767523dbd 167 } else if (r == (R1_IDLE_STATE | R1_ILLEGAL_COMMAND)) {
jamesheavey 101:0df767523dbd 168 return initialise_card_v1();
jamesheavey 101:0df767523dbd 169 } else {
jamesheavey 101:0df767523dbd 170 debug("Not in idle state after sending CMD8 (not an SD card?)\n");
jamesheavey 101:0df767523dbd 171 return SDCARD_FAIL;
jamesheavey 101:0df767523dbd 172 }
jamesheavey 101:0df767523dbd 173 }
jamesheavey 101:0df767523dbd 174
jamesheavey 101:0df767523dbd 175 int SDFileSystem::initialise_card_v1() {
jamesheavey 101:0df767523dbd 176 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
jamesheavey 101:0df767523dbd 177 _cmd(55, 0);
jamesheavey 101:0df767523dbd 178 if (_cmd(41, 0) == 0) {
jamesheavey 101:0df767523dbd 179 cdv = 512;
jamesheavey 101:0df767523dbd 180 debug_if(SD_DBG, "\n\rInit: SEDCARD_V1\n\r");
jamesheavey 101:0df767523dbd 181 return SDCARD_V1;
jamesheavey 101:0df767523dbd 182 }
jamesheavey 101:0df767523dbd 183 }
jamesheavey 101:0df767523dbd 184
jamesheavey 101:0df767523dbd 185 debug("Timeout waiting for v1.x card\n");
jamesheavey 101:0df767523dbd 186 return SDCARD_FAIL;
jamesheavey 101:0df767523dbd 187 }
jamesheavey 101:0df767523dbd 188
jamesheavey 101:0df767523dbd 189 int SDFileSystem::initialise_card_v2() {
jamesheavey 101:0df767523dbd 190 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
jamesheavey 101:0df767523dbd 191 wait_ms(50);
jamesheavey 101:0df767523dbd 192 _cmd58();
jamesheavey 101:0df767523dbd 193 _cmd(55, 0);
jamesheavey 101:0df767523dbd 194 if (_cmd(41, 0x40000000) == 0) {
jamesheavey 101:0df767523dbd 195 _cmd58();
jamesheavey 101:0df767523dbd 196 debug_if(SD_DBG, "\n\rInit: SDCARD_V2\n\r");
jamesheavey 101:0df767523dbd 197 cdv = 1;
jamesheavey 101:0df767523dbd 198 return SDCARD_V2;
jamesheavey 101:0df767523dbd 199 }
jamesheavey 101:0df767523dbd 200 }
jamesheavey 101:0df767523dbd 201
jamesheavey 101:0df767523dbd 202 debug("Timeout waiting for v2.x card\n");
jamesheavey 101:0df767523dbd 203 return SDCARD_FAIL;
jamesheavey 101:0df767523dbd 204 }
jamesheavey 101:0df767523dbd 205
jamesheavey 101:0df767523dbd 206 int SDFileSystem::disk_initialize() {
jamesheavey 101:0df767523dbd 207 _is_initialized = initialise_card();
jamesheavey 101:0df767523dbd 208 if (_is_initialized == 0) {
jamesheavey 101:0df767523dbd 209 debug("Fail to initialize card\n");
jamesheavey 101:0df767523dbd 210 return 1;
jamesheavey 101:0df767523dbd 211 }
jamesheavey 101:0df767523dbd 212 debug_if(SD_DBG, "init card = %d\n", _is_initialized);
jamesheavey 101:0df767523dbd 213 _sectors = _sd_sectors();
jamesheavey 101:0df767523dbd 214
jamesheavey 101:0df767523dbd 215 // Set block length to 512 (CMD16)
jamesheavey 101:0df767523dbd 216 if (_cmd(16, 512) != 0) {
jamesheavey 101:0df767523dbd 217 debug("Set 512-byte block timed out\n");
jamesheavey 101:0df767523dbd 218 return 1;
jamesheavey 101:0df767523dbd 219 }
jamesheavey 101:0df767523dbd 220
jamesheavey 101:0df767523dbd 221 // Set SCK for data transfer
jamesheavey 101:0df767523dbd 222 _spi.frequency(_transfer_sck);
jamesheavey 101:0df767523dbd 223 return 0;
jamesheavey 101:0df767523dbd 224 }
jamesheavey 101:0df767523dbd 225
jamesheavey 101:0df767523dbd 226 int SDFileSystem::disk_write(const uint8_t* buffer, uint32_t block_number, uint32_t count) {
jamesheavey 101:0df767523dbd 227 if (!_is_initialized) {
jamesheavey 101:0df767523dbd 228 return -1;
jamesheavey 101:0df767523dbd 229 }
jamesheavey 101:0df767523dbd 230
jamesheavey 101:0df767523dbd 231 for (uint32_t b = block_number; b < block_number + count; b++) {
jamesheavey 101:0df767523dbd 232 // set write address for single block (CMD24)
jamesheavey 101:0df767523dbd 233 if (_cmd(24, b * cdv) != 0) {
jamesheavey 101:0df767523dbd 234 return 1;
jamesheavey 101:0df767523dbd 235 }
jamesheavey 101:0df767523dbd 236
jamesheavey 101:0df767523dbd 237 // send the data block
jamesheavey 101:0df767523dbd 238 _write(buffer, 512);
jamesheavey 101:0df767523dbd 239 buffer += 512;
jamesheavey 101:0df767523dbd 240 }
jamesheavey 101:0df767523dbd 241
jamesheavey 101:0df767523dbd 242 return 0;
jamesheavey 101:0df767523dbd 243 }
jamesheavey 101:0df767523dbd 244
jamesheavey 101:0df767523dbd 245 int SDFileSystem::disk_read(uint8_t* buffer, uint32_t block_number, uint32_t count) {
jamesheavey 101:0df767523dbd 246 if (!_is_initialized) {
jamesheavey 101:0df767523dbd 247 return -1;
jamesheavey 101:0df767523dbd 248 }
jamesheavey 101:0df767523dbd 249
jamesheavey 101:0df767523dbd 250 for (uint32_t b = block_number; b < block_number + count; b++) {
jamesheavey 101:0df767523dbd 251 // set read address for single block (CMD17)
jamesheavey 101:0df767523dbd 252 if (_cmd(17, b * cdv) != 0) {
jamesheavey 101:0df767523dbd 253 return 1;
jamesheavey 101:0df767523dbd 254 }
jamesheavey 101:0df767523dbd 255
jamesheavey 101:0df767523dbd 256 // receive the data
jamesheavey 101:0df767523dbd 257 _read(buffer, 512);
jamesheavey 101:0df767523dbd 258 buffer += 512;
jamesheavey 101:0df767523dbd 259 }
jamesheavey 101:0df767523dbd 260
jamesheavey 101:0df767523dbd 261 return 0;
jamesheavey 101:0df767523dbd 262 }
jamesheavey 101:0df767523dbd 263
jamesheavey 101:0df767523dbd 264 int SDFileSystem::disk_status() {
jamesheavey 101:0df767523dbd 265 // FATFileSystem::disk_status() returns 0 when initialized
jamesheavey 101:0df767523dbd 266 if (_is_initialized) {
jamesheavey 101:0df767523dbd 267 return 0;
jamesheavey 101:0df767523dbd 268 } else {
jamesheavey 101:0df767523dbd 269 return 1;
jamesheavey 101:0df767523dbd 270 }
jamesheavey 101:0df767523dbd 271 }
jamesheavey 101:0df767523dbd 272
jamesheavey 101:0df767523dbd 273 int SDFileSystem::disk_sync() { return 0; }
jamesheavey 101:0df767523dbd 274 uint32_t SDFileSystem::disk_sectors() { return _sectors; }
jamesheavey 101:0df767523dbd 275
jamesheavey 101:0df767523dbd 276
jamesheavey 101:0df767523dbd 277 // PRIVATE FUNCTIONS
jamesheavey 101:0df767523dbd 278 int SDFileSystem::_cmd(int cmd, int arg) {
jamesheavey 101:0df767523dbd 279 _cs = 0;
jamesheavey 101:0df767523dbd 280
jamesheavey 101:0df767523dbd 281 // send a command
jamesheavey 101:0df767523dbd 282 _spi.write(0x40 | cmd);
jamesheavey 101:0df767523dbd 283 _spi.write(arg >> 24);
jamesheavey 101:0df767523dbd 284 _spi.write(arg >> 16);
jamesheavey 101:0df767523dbd 285 _spi.write(arg >> 8);
jamesheavey 101:0df767523dbd 286 _spi.write(arg >> 0);
jamesheavey 101:0df767523dbd 287 _spi.write(0x95);
jamesheavey 101:0df767523dbd 288
jamesheavey 101:0df767523dbd 289 // wait for the repsonse (response[7] == 0)
jamesheavey 101:0df767523dbd 290 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
jamesheavey 101:0df767523dbd 291 int response = _spi.write(0xFF);
jamesheavey 101:0df767523dbd 292 if (!(response & 0x80)) {
jamesheavey 101:0df767523dbd 293 _cs = 1;
jamesheavey 101:0df767523dbd 294 _spi.write(0xFF);
jamesheavey 101:0df767523dbd 295 return response;
jamesheavey 101:0df767523dbd 296 }
jamesheavey 101:0df767523dbd 297 }
jamesheavey 101:0df767523dbd 298 _cs = 1;
jamesheavey 101:0df767523dbd 299 _spi.write(0xFF);
jamesheavey 101:0df767523dbd 300 return -1; // timeout
jamesheavey 101:0df767523dbd 301 }
jamesheavey 101:0df767523dbd 302 int SDFileSystem::_cmdx(int cmd, int arg) {
jamesheavey 101:0df767523dbd 303 _cs = 0;
jamesheavey 101:0df767523dbd 304
jamesheavey 101:0df767523dbd 305 // send a command
jamesheavey 101:0df767523dbd 306 _spi.write(0x40 | cmd);
jamesheavey 101:0df767523dbd 307 _spi.write(arg >> 24);
jamesheavey 101:0df767523dbd 308 _spi.write(arg >> 16);
jamesheavey 101:0df767523dbd 309 _spi.write(arg >> 8);
jamesheavey 101:0df767523dbd 310 _spi.write(arg >> 0);
jamesheavey 101:0df767523dbd 311 _spi.write(0x95);
jamesheavey 101:0df767523dbd 312
jamesheavey 101:0df767523dbd 313 // wait for the repsonse (response[7] == 0)
jamesheavey 101:0df767523dbd 314 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
jamesheavey 101:0df767523dbd 315 int response = _spi.write(0xFF);
jamesheavey 101:0df767523dbd 316 if (!(response & 0x80)) {
jamesheavey 101:0df767523dbd 317 return response;
jamesheavey 101:0df767523dbd 318 }
jamesheavey 101:0df767523dbd 319 }
jamesheavey 101:0df767523dbd 320 _cs = 1;
jamesheavey 101:0df767523dbd 321 _spi.write(0xFF);
jamesheavey 101:0df767523dbd 322 return -1; // timeout
jamesheavey 101:0df767523dbd 323 }
jamesheavey 101:0df767523dbd 324
jamesheavey 101:0df767523dbd 325
jamesheavey 101:0df767523dbd 326 int SDFileSystem::_cmd58() {
jamesheavey 101:0df767523dbd 327 _cs = 0;
jamesheavey 101:0df767523dbd 328 int arg = 0;
jamesheavey 101:0df767523dbd 329
jamesheavey 101:0df767523dbd 330 // send a command
jamesheavey 101:0df767523dbd 331 _spi.write(0x40 | 58);
jamesheavey 101:0df767523dbd 332 _spi.write(arg >> 24);
jamesheavey 101:0df767523dbd 333 _spi.write(arg >> 16);
jamesheavey 101:0df767523dbd 334 _spi.write(arg >> 8);
jamesheavey 101:0df767523dbd 335 _spi.write(arg >> 0);
jamesheavey 101:0df767523dbd 336 _spi.write(0x95);
jamesheavey 101:0df767523dbd 337
jamesheavey 101:0df767523dbd 338 // wait for the repsonse (response[7] == 0)
jamesheavey 101:0df767523dbd 339 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
jamesheavey 101:0df767523dbd 340 int response = _spi.write(0xFF);
jamesheavey 101:0df767523dbd 341 if (!(response & 0x80)) {
jamesheavey 101:0df767523dbd 342 int ocr = _spi.write(0xFF) << 24;
jamesheavey 101:0df767523dbd 343 ocr |= _spi.write(0xFF) << 16;
jamesheavey 101:0df767523dbd 344 ocr |= _spi.write(0xFF) << 8;
jamesheavey 101:0df767523dbd 345 ocr |= _spi.write(0xFF) << 0;
jamesheavey 101:0df767523dbd 346 _cs = 1;
jamesheavey 101:0df767523dbd 347 _spi.write(0xFF);
jamesheavey 101:0df767523dbd 348 return response;
jamesheavey 101:0df767523dbd 349 }
jamesheavey 101:0df767523dbd 350 }
jamesheavey 101:0df767523dbd 351 _cs = 1;
jamesheavey 101:0df767523dbd 352 _spi.write(0xFF);
jamesheavey 101:0df767523dbd 353 return -1; // timeout
jamesheavey 101:0df767523dbd 354 }
jamesheavey 101:0df767523dbd 355
jamesheavey 101:0df767523dbd 356 int SDFileSystem::_cmd8() {
jamesheavey 101:0df767523dbd 357 _cs = 0;
jamesheavey 101:0df767523dbd 358
jamesheavey 101:0df767523dbd 359 // send a command
jamesheavey 101:0df767523dbd 360 _spi.write(0x40 | 8); // CMD8
jamesheavey 101:0df767523dbd 361 _spi.write(0x00); // reserved
jamesheavey 101:0df767523dbd 362 _spi.write(0x00); // reserved
jamesheavey 101:0df767523dbd 363 _spi.write(0x01); // 3.3v
jamesheavey 101:0df767523dbd 364 _spi.write(0xAA); // check pattern
jamesheavey 101:0df767523dbd 365 _spi.write(0x87); // crc
jamesheavey 101:0df767523dbd 366
jamesheavey 101:0df767523dbd 367 // wait for the repsonse (response[7] == 0)
jamesheavey 101:0df767523dbd 368 for (int i = 0; i < SD_COMMAND_TIMEOUT * 1000; i++) {
jamesheavey 101:0df767523dbd 369 char response[5];
jamesheavey 101:0df767523dbd 370 response[0] = _spi.write(0xFF);
jamesheavey 101:0df767523dbd 371 if (!(response[0] & 0x80)) {
jamesheavey 101:0df767523dbd 372 for (int j = 1; j < 5; j++) {
jamesheavey 101:0df767523dbd 373 response[i] = _spi.write(0xFF);
jamesheavey 101:0df767523dbd 374 }
jamesheavey 101:0df767523dbd 375 _cs = 1;
jamesheavey 101:0df767523dbd 376 _spi.write(0xFF);
jamesheavey 101:0df767523dbd 377 return response[0];
jamesheavey 101:0df767523dbd 378 }
jamesheavey 101:0df767523dbd 379 }
jamesheavey 101:0df767523dbd 380 _cs = 1;
jamesheavey 101:0df767523dbd 381 _spi.write(0xFF);
jamesheavey 101:0df767523dbd 382 return -1; // timeout
jamesheavey 101:0df767523dbd 383 }
jamesheavey 101:0df767523dbd 384
jamesheavey 101:0df767523dbd 385 int SDFileSystem::_read(uint8_t *buffer, uint32_t length) {
jamesheavey 101:0df767523dbd 386 _cs = 0;
jamesheavey 101:0df767523dbd 387
jamesheavey 101:0df767523dbd 388 // read until start byte (0xFF)
jamesheavey 101:0df767523dbd 389 while (_spi.write(0xFF) != 0xFE);
jamesheavey 101:0df767523dbd 390
jamesheavey 101:0df767523dbd 391 // read data
jamesheavey 101:0df767523dbd 392 for (uint32_t i = 0; i < length; i++) {
jamesheavey 101:0df767523dbd 393 buffer[i] = _spi.write(0xFF);
jamesheavey 101:0df767523dbd 394 }
jamesheavey 101:0df767523dbd 395 _spi.write(0xFF); // checksum
jamesheavey 101:0df767523dbd 396 _spi.write(0xFF);
jamesheavey 101:0df767523dbd 397
jamesheavey 101:0df767523dbd 398 _cs = 1;
jamesheavey 101:0df767523dbd 399 _spi.write(0xFF);
jamesheavey 101:0df767523dbd 400 return 0;
jamesheavey 101:0df767523dbd 401 }
jamesheavey 101:0df767523dbd 402
jamesheavey 101:0df767523dbd 403 int SDFileSystem::_write(const uint8_t*buffer, uint32_t length) {
jamesheavey 101:0df767523dbd 404 _cs = 0;
jamesheavey 101:0df767523dbd 405
jamesheavey 101:0df767523dbd 406 // indicate start of block
jamesheavey 101:0df767523dbd 407 _spi.write(0xFE);
jamesheavey 101:0df767523dbd 408
jamesheavey 101:0df767523dbd 409 // write the data
jamesheavey 101:0df767523dbd 410 for (uint32_t i = 0; i < length; i++) {
jamesheavey 101:0df767523dbd 411 _spi.write(buffer[i]);
jamesheavey 101:0df767523dbd 412 }
jamesheavey 101:0df767523dbd 413
jamesheavey 101:0df767523dbd 414 // write the checksum
jamesheavey 101:0df767523dbd 415 _spi.write(0xFF);
jamesheavey 101:0df767523dbd 416 _spi.write(0xFF);
jamesheavey 101:0df767523dbd 417
jamesheavey 101:0df767523dbd 418 // check the response token
jamesheavey 101:0df767523dbd 419 if ((_spi.write(0xFF) & 0x1F) != 0x05) {
jamesheavey 101:0df767523dbd 420 _cs = 1;
jamesheavey 101:0df767523dbd 421 _spi.write(0xFF);
jamesheavey 101:0df767523dbd 422 return 1;
jamesheavey 101:0df767523dbd 423 }
jamesheavey 101:0df767523dbd 424
jamesheavey 101:0df767523dbd 425 // wait for write to finish
jamesheavey 101:0df767523dbd 426 while (_spi.write(0xFF) == 0);
jamesheavey 101:0df767523dbd 427
jamesheavey 101:0df767523dbd 428 _cs = 1;
jamesheavey 101:0df767523dbd 429 _spi.write(0xFF);
jamesheavey 101:0df767523dbd 430 return 0;
jamesheavey 101:0df767523dbd 431 }
jamesheavey 101:0df767523dbd 432
jamesheavey 101:0df767523dbd 433 static uint32_t ext_bits(unsigned char *data, int msb, int lsb) {
jamesheavey 101:0df767523dbd 434 uint32_t bits = 0;
jamesheavey 101:0df767523dbd 435 uint32_t size = 1 + msb - lsb;
jamesheavey 101:0df767523dbd 436 for (uint32_t i = 0; i < size; i++) {
jamesheavey 101:0df767523dbd 437 uint32_t position = lsb + i;
jamesheavey 101:0df767523dbd 438 uint32_t byte = 15 - (position >> 3);
jamesheavey 101:0df767523dbd 439 uint32_t bit = position & 0x7;
jamesheavey 101:0df767523dbd 440 uint32_t value = (data[byte] >> bit) & 1;
jamesheavey 101:0df767523dbd 441 bits |= value << i;
jamesheavey 101:0df767523dbd 442 }
jamesheavey 101:0df767523dbd 443 return bits;
jamesheavey 101:0df767523dbd 444 }
jamesheavey 101:0df767523dbd 445
jamesheavey 101:0df767523dbd 446 uint32_t SDFileSystem::_sd_sectors() {
jamesheavey 101:0df767523dbd 447 uint32_t c_size, c_size_mult, read_bl_len;
jamesheavey 101:0df767523dbd 448 uint32_t block_len, mult, blocknr, capacity;
jamesheavey 101:0df767523dbd 449 uint32_t hc_c_size;
jamesheavey 101:0df767523dbd 450 uint32_t blocks;
jamesheavey 101:0df767523dbd 451
jamesheavey 101:0df767523dbd 452 // CMD9, Response R2 (R1 byte + 16-byte block read)
jamesheavey 101:0df767523dbd 453 if (_cmdx(9, 0) != 0) {
jamesheavey 101:0df767523dbd 454 debug("Didn't get a response from the disk\n");
jamesheavey 101:0df767523dbd 455 return 0;
jamesheavey 101:0df767523dbd 456 }
jamesheavey 101:0df767523dbd 457
jamesheavey 101:0df767523dbd 458 uint8_t csd[16];
jamesheavey 101:0df767523dbd 459 if (_read(csd, 16) != 0) {
jamesheavey 101:0df767523dbd 460 debug("Couldn't read csd response from disk\n");
jamesheavey 101:0df767523dbd 461 return 0;
jamesheavey 101:0df767523dbd 462 }
jamesheavey 101:0df767523dbd 463
jamesheavey 101:0df767523dbd 464 // csd_structure : csd[127:126]
jamesheavey 101:0df767523dbd 465 // c_size : csd[73:62]
jamesheavey 101:0df767523dbd 466 // c_size_mult : csd[49:47]
jamesheavey 101:0df767523dbd 467 // read_bl_len : csd[83:80] - the *maximum* read block length
jamesheavey 101:0df767523dbd 468
jamesheavey 101:0df767523dbd 469 int csd_structure = ext_bits(csd, 127, 126);
jamesheavey 101:0df767523dbd 470
jamesheavey 101:0df767523dbd 471 switch (csd_structure) {
jamesheavey 101:0df767523dbd 472 case 0:
jamesheavey 101:0df767523dbd 473 cdv = 512;
jamesheavey 101:0df767523dbd 474 c_size = ext_bits(csd, 73, 62);
jamesheavey 101:0df767523dbd 475 c_size_mult = ext_bits(csd, 49, 47);
jamesheavey 101:0df767523dbd 476 read_bl_len = ext_bits(csd, 83, 80);
jamesheavey 101:0df767523dbd 477
jamesheavey 101:0df767523dbd 478 block_len = 1 << read_bl_len;
jamesheavey 101:0df767523dbd 479 mult = 1 << (c_size_mult + 2);
jamesheavey 101:0df767523dbd 480 blocknr = (c_size + 1) * mult;
jamesheavey 101:0df767523dbd 481 capacity = blocknr * block_len;
jamesheavey 101:0df767523dbd 482 blocks = capacity / 512;
jamesheavey 101:0df767523dbd 483 debug_if(SD_DBG, "\n\rSDCard\n\rc_size: %d \n\rcapacity: %ld \n\rsectors: %lld\n\r", c_size, capacity, blocks);
jamesheavey 101:0df767523dbd 484 break;
jamesheavey 101:0df767523dbd 485
jamesheavey 101:0df767523dbd 486 case 1:
jamesheavey 101:0df767523dbd 487 cdv = 1;
jamesheavey 101:0df767523dbd 488 hc_c_size = ext_bits(csd, 63, 48);
jamesheavey 101:0df767523dbd 489 blocks = (hc_c_size+1)*1024;
jamesheavey 101:0df767523dbd 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);
jamesheavey 101:0df767523dbd 491 break;
jamesheavey 101:0df767523dbd 492
jamesheavey 101:0df767523dbd 493 default:
jamesheavey 101:0df767523dbd 494 debug("CSD struct unsupported\r\n");
jamesheavey 101:0df767523dbd 495 return 0;
jamesheavey 101:0df767523dbd 496 };
jamesheavey 101:0df767523dbd 497 return blocks;
jamesheavey 101:0df767523dbd 498 }