Department of Electrical Eng University of Moratuwa / Mbed 2 deprecated Vibration_Analysis_Force_Control

Force controlled vibration analysis

Dependencies:   mbed

SDFileSystem/SDFileSystem.cpp@5:9ab19c63203e, 2019-12-03 (annotated)

Committer:
eembed
Date:
Tue Dec 03 10:40:16 2019 +0000
Revision:
5:9ab19c63203e
Parent:
0:5459cdde6298 
first commit;

Who changed what in which revision?

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eembed 0:5459cdde6298 1 /* mbed Microcontroller Library
eembed 0:5459cdde6298 2 * Copyright (c) 2006-2012 ARM Limited
eembed 0:5459cdde6298 3 *
eembed 0:5459cdde6298 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
eembed 0:5459cdde6298 5 * of this software and associated documentation files (the "Software"), to deal
eembed 0:5459cdde6298 6 * in the Software without restriction, including without limitation the rights
eembed 0:5459cdde6298 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
eembed 0:5459cdde6298 8 * copies of the Software, and to permit persons to whom the Software is
eembed 0:5459cdde6298 9 * furnished to do so, subject to the following conditions:
eembed 0:5459cdde6298 10 *
eembed 0:5459cdde6298 11 * The above copyright notice and this permission notice shall be included in
eembed 0:5459cdde6298 12 * all copies or substantial portions of the Software.
eembed 0:5459cdde6298 13 *
eembed 0:5459cdde6298 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
eembed 0:5459cdde6298 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
eembed 0:5459cdde6298 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
eembed 0:5459cdde6298 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
eembed 0:5459cdde6298 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
eembed 0:5459cdde6298 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
eembed 0:5459cdde6298 20 * SOFTWARE.
eembed 0:5459cdde6298 21 */
eembed 0:5459cdde6298 22
eembed 0:5459cdde6298 23 /* Introduction
eembed 0:5459cdde6298 24 * ------------
eembed 0:5459cdde6298 25 * SD and MMC cards support a number of interfaces, but common to them all
eembed 0:5459cdde6298 26 * is one based on SPI. This is the one I'm implmenting because it means
eembed 0:5459cdde6298 27 * it is much more portable even though not so performant, and we already
eembed 0:5459cdde6298 28 * have the mbed SPI Interface!
eembed 0:5459cdde6298 29 *
eembed 0:5459cdde6298 30 * The main reference I'm using is Chapter 7, "SPI Mode" of:
eembed 0:5459cdde6298 31 * http://www.sdcard.org/developers/tech/sdcard/pls/Simplified_Physical_Layer_Spec.pdf
eembed 0:5459cdde6298 32 *
eembed 0:5459cdde6298 33 * SPI Startup
eembed 0:5459cdde6298 34 * -----------
eembed 0:5459cdde6298 35 * The SD card powers up in SD mode. The SPI interface mode is selected by
eembed 0:5459cdde6298 36 * asserting CS low and sending the reset command (CMD0). The card will
eembed 0:5459cdde6298 37 * respond with a (R1) response.
eembed 0:5459cdde6298 38 *
eembed 0:5459cdde6298 39 * CMD8 is optionally sent to determine the voltage range supported, and
eembed 0:5459cdde6298 40 * indirectly determine whether it is a version 1.x SD/non-SD card or
eembed 0:5459cdde6298 41 * version 2.x. I'll just ignore this for now.
eembed 0:5459cdde6298 42 *
eembed 0:5459cdde6298 43 * ACMD41 is repeatedly issued to initialise the card, until "in idle"
eembed 0:5459cdde6298 44 * (bit 0) of the R1 response goes to '0', indicating it is initialised.
eembed 0:5459cdde6298 45 *
eembed 0:5459cdde6298 46 * You should also indicate whether the host supports High Capicity cards,
eembed 0:5459cdde6298 47 * and check whether the card is high capacity - i'll also ignore this
eembed 0:5459cdde6298 48 *
eembed 0:5459cdde6298 49 * SPI Protocol
eembed 0:5459cdde6298 50 * ------------
eembed 0:5459cdde6298 51 * The SD SPI protocol is based on transactions made up of 8-bit words, with
eembed 0:5459cdde6298 52 * the host starting every bus transaction by asserting the CS signal low. The
eembed 0:5459cdde6298 53 * card always responds to commands, data blocks and errors.
eembed 0:5459cdde6298 54 *
eembed 0:5459cdde6298 55 * The protocol supports a CRC, but by default it is off (except for the
eembed 0:5459cdde6298 56 * first reset CMD0, where the CRC can just be pre-calculated, and CMD8)
eembed 0:5459cdde6298 57 * I'll leave the CRC off I think!
eembed 0:5459cdde6298 58 *
eembed 0:5459cdde6298 59 * Standard capacity cards have variable data block sizes, whereas High
eembed 0:5459cdde6298 60 * Capacity cards fix the size of data block to 512 bytes. I'll therefore
eembed 0:5459cdde6298 61 * just always use the Standard Capacity cards with a block size of 512 bytes.
eembed 0:5459cdde6298 62 * This is set with CMD16.
eembed 0:5459cdde6298 63 *
eembed 0:5459cdde6298 64 * You can read and write single blocks (CMD17, CMD25) or multiple blocks
eembed 0:5459cdde6298 65 * (CMD18, CMD25). For simplicity, I'll just use single block accesses. When
eembed 0:5459cdde6298 66 * the card gets a read command, it responds with a response token, and then
eembed 0:5459cdde6298 67 * a data token or an error.
eembed 0:5459cdde6298 68 *
eembed 0:5459cdde6298 69 * SPI Command Format
eembed 0:5459cdde6298 70 * ------------------
eembed 0:5459cdde6298 71 * Commands are 6-bytes long, containing the command, 32-bit argument, and CRC.
eembed 0:5459cdde6298 72 *
eembed 0:5459cdde6298 73 * +---------------+------------+------------+-----------+----------+--------------+
eembed 0:5459cdde6298 74 * | 01 | cmd[5:0] | arg[31:24] | arg[23:16] | arg[15:8] | arg[7:0] | crc[6:0] | 1 |
eembed 0:5459cdde6298 75 * +---------------+------------+------------+-----------+----------+--------------+
eembed 0:5459cdde6298 76 *
eembed 0:5459cdde6298 77 * As I'm not using CRC, I can fix that byte to what is needed for CMD0 (0x95)
eembed 0:5459cdde6298 78 *
eembed 0:5459cdde6298 79 * All Application Specific commands shall be preceded with APP_CMD (CMD55).
eembed 0:5459cdde6298 80 *
eembed 0:5459cdde6298 81 * SPI Response Format
eembed 0:5459cdde6298 82 * -------------------
eembed 0:5459cdde6298 83 * The main response format (R1) is a status byte (normally zero). Key flags:
eembed 0:5459cdde6298 84 * idle - 1 if the card is in an idle state/initialising
eembed 0:5459cdde6298 85 * cmd - 1 if an illegal command code was detected
eembed 0:5459cdde6298 86 *
eembed 0:5459cdde6298 87 * +-------------------------------------------------+
eembed 0:5459cdde6298 88 * R1 | 0 | arg | addr | seq | crc | cmd | erase | idle |
eembed 0:5459cdde6298 89 * +-------------------------------------------------+
eembed 0:5459cdde6298 90 *
eembed 0:5459cdde6298 91 * R1b is the same, except it is followed by a busy signal (zeros) until
eembed 0:5459cdde6298 92 * the first non-zero byte when it is ready again.
eembed 0:5459cdde6298 93 *
eembed 0:5459cdde6298 94 * Data Response Token
eembed 0:5459cdde6298 95 * -------------------
eembed 0:5459cdde6298 96 * Every data block written to the card is acknowledged by a byte
eembed 0:5459cdde6298 97 * response token
eembed 0:5459cdde6298 98 *
eembed 0:5459cdde6298 99 * +----------------------+
eembed 0:5459cdde6298 100 * | xxx | 0 | status | 1 |
eembed 0:5459cdde6298 101 * +----------------------+
eembed 0:5459cdde6298 102 * 010 - OK!
eembed 0:5459cdde6298 103 * 101 - CRC Error
eembed 0:5459cdde6298 104 * 110 - Write Error
eembed 0:5459cdde6298 105 *
eembed 0:5459cdde6298 106 * Single Block Read and Write
eembed 0:5459cdde6298 107 * ---------------------------
eembed 0:5459cdde6298 108 *
eembed 0:5459cdde6298 109 * Block transfers have a byte header, followed by the data, followed
eembed 0:5459cdde6298 110 * by a 16-bit CRC. In our case, the data will always be 512 bytes.
eembed 0:5459cdde6298 111 *
eembed 0:5459cdde6298 112 * +------+---------+---------+- - - -+---------+-----------+----------+
eembed 0:5459cdde6298 113 * | 0xFE | data[0] | data[1] | | data[n] | crc[15:8] | crc[7:0] |
eembed 0:5459cdde6298 114 * +------+---------+---------+- - - -+---------+-----------+----------+
eembed 0:5459cdde6298 115 */
eembed 0:5459cdde6298 116 #include "SDFileSystem.h"
eembed 0:5459cdde6298 117 #include "mbed_debug.h"
eembed 0:5459cdde6298 118
eembed 0:5459cdde6298 119 #define SD_COMMAND_TIMEOUT 5000
eembed 0:5459cdde6298 120
eembed 0:5459cdde6298 121 #define SD_DBG 0
eembed 0:5459cdde6298 122
eembed 0:5459cdde6298 123 SDFileSystem::SDFileSystem(PinName mosi, PinName miso, PinName sclk, PinName cs, const char* name) :
eembed 0:5459cdde6298 124 FATFileSystem(name), _spi(mosi, miso, sclk), _cs(cs) {
eembed 0:5459cdde6298 125 _cs = 1;
eembed 0:5459cdde6298 126 }
eembed 0:5459cdde6298 127
eembed 0:5459cdde6298 128 #define R1_IDLE_STATE (1 << 0)
eembed 0:5459cdde6298 129 #define R1_ERASE_RESET (1 << 1)
eembed 0:5459cdde6298 130 #define R1_ILLEGAL_COMMAND (1 << 2)
eembed 0:5459cdde6298 131 #define R1_COM_CRC_ERROR (1 << 3)
eembed 0:5459cdde6298 132 #define R1_ERASE_SEQUENCE_ERROR (1 << 4)
eembed 0:5459cdde6298 133 #define R1_ADDRESS_ERROR (1 << 5)
eembed 0:5459cdde6298 134 #define R1_PARAMETER_ERROR (1 << 6)
eembed 0:5459cdde6298 135
eembed 0:5459cdde6298 136 // Types
eembed 0:5459cdde6298 137 #define SDCARD_FAIL 0 //!< v1.x Standard Capacity
eembed 0:5459cdde6298 138 #define SDCARD_V1 1 //!< v2.x Standard Capacity
eembed 0:5459cdde6298 139 #define SDCARD_V2 2 //!< v2.x High Capacity
eembed 0:5459cdde6298 140 #define SDCARD_V2HC 3 //!< Not recognised as an SD Card
eembed 0:5459cdde6298 141
eembed 0:5459cdde6298 142 int SDFileSystem::initialise_card() {
eembed 0:5459cdde6298 143 // Set to 100kHz for initialisation, and clock card with cs = 1
eembed 5:9ab19c63203e 144 _spi.frequency(1000000);
eembed 0:5459cdde6298 145 _cs = 1;
eembed 0:5459cdde6298 146 for (int i = 0; i < 16; i++) {
eembed 0:5459cdde6298 147 _spi.write(0xFF);
eembed 0:5459cdde6298 148 }
eembed 0:5459cdde6298 149
eembed 0:5459cdde6298 150 // send CMD0, should return with all zeros except IDLE STATE set (bit 0)
eembed 0:5459cdde6298 151 if (_cmd(0, 0) != R1_IDLE_STATE) {
eembed 0:5459cdde6298 152 debug("No disk, or could not put SD card in to SPI idle state\n");
eembed 0:5459cdde6298 153 return SDCARD_FAIL;
eembed 0:5459cdde6298 154 }
eembed 0:5459cdde6298 155
eembed 0:5459cdde6298 156 // send CMD8 to determine whther it is ver 2.x
eembed 0:5459cdde6298 157 int r = _cmd8();
eembed 0:5459cdde6298 158 if (r == R1_IDLE_STATE) {
eembed 0:5459cdde6298 159 return initialise_card_v2();
eembed 0:5459cdde6298 160 } else if (r == (R1_IDLE_STATE | R1_ILLEGAL_COMMAND)) {
eembed 0:5459cdde6298 161 return initialise_card_v1();
eembed 0:5459cdde6298 162 } else {
eembed 0:5459cdde6298 163 debug("Not in idle state after sending CMD8 (not an SD card?)\n");
eembed 0:5459cdde6298 164 return SDCARD_FAIL;
eembed 0:5459cdde6298 165 }
eembed 0:5459cdde6298 166 }
eembed 0:5459cdde6298 167
eembed 0:5459cdde6298 168 int SDFileSystem::initialise_card_v1() {
eembed 0:5459cdde6298 169 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
eembed 0:5459cdde6298 170 _cmd(55, 0);
eembed 0:5459cdde6298 171 if (_cmd(41, 0) == 0) {
eembed 0:5459cdde6298 172 cdv = 512;
eembed 0:5459cdde6298 173 debug_if(SD_DBG, "\n\rInit: SEDCARD_V1\n\r");
eembed 0:5459cdde6298 174 return SDCARD_V1;
eembed 0:5459cdde6298 175 }
eembed 0:5459cdde6298 176 }
eembed 0:5459cdde6298 177
eembed 0:5459cdde6298 178 debug("Timeout waiting for v1.x card\n");
eembed 0:5459cdde6298 179 return SDCARD_FAIL;
eembed 0:5459cdde6298 180 }
eembed 0:5459cdde6298 181
eembed 0:5459cdde6298 182 int SDFileSystem::initialise_card_v2() {
eembed 0:5459cdde6298 183 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
eembed 0:5459cdde6298 184 wait_ms(50);
eembed 0:5459cdde6298 185 _cmd58();
eembed 0:5459cdde6298 186 _cmd(55, 0);
eembed 0:5459cdde6298 187 if (_cmd(41, 0x40000000) == 0) {
eembed 0:5459cdde6298 188 _cmd58();
eembed 0:5459cdde6298 189 debug_if(SD_DBG, "\n\rInit: SDCARD_V2\n\r");
eembed 0:5459cdde6298 190 cdv = 1;
eembed 0:5459cdde6298 191 return SDCARD_V2;
eembed 0:5459cdde6298 192 }
eembed 0:5459cdde6298 193 }
eembed 0:5459cdde6298 194
eembed 0:5459cdde6298 195 debug("Timeout waiting for v2.x card\n");
eembed 0:5459cdde6298 196 return SDCARD_FAIL;
eembed 0:5459cdde6298 197 }
eembed 0:5459cdde6298 198
eembed 0:5459cdde6298 199 int SDFileSystem::disk_initialize() {
eembed 0:5459cdde6298 200 int i = initialise_card();
eembed 0:5459cdde6298 201 debug_if(SD_DBG, "init card = %d\n", i);
eembed 0:5459cdde6298 202 _sectors = _sd_sectors();
eembed 0:5459cdde6298 203
eembed 0:5459cdde6298 204 // Set block length to 512 (CMD16)
eembed 0:5459cdde6298 205 if (_cmd(16, 512) != 0) {
eembed 0:5459cdde6298 206 debug("Set 512-byte block timed out\n");
eembed 0:5459cdde6298 207 return 1;
eembed 0:5459cdde6298 208 }
eembed 0:5459cdde6298 209
eembed 0:5459cdde6298 210 _spi.frequency(1000000); // Set to 1MHz for data transfer
eembed 0:5459cdde6298 211 return 0;
eembed 0:5459cdde6298 212 }
eembed 0:5459cdde6298 213
eembed 0:5459cdde6298 214 int SDFileSystem::disk_write(const uint8_t *buffer, uint64_t block_number) {
eembed 0:5459cdde6298 215 // set write address for single block (CMD24)
eembed 0:5459cdde6298 216 if (_cmd(24, block_number * cdv) != 0) {
eembed 0:5459cdde6298 217 return 1;
eembed 0:5459cdde6298 218 }
eembed 0:5459cdde6298 219
eembed 0:5459cdde6298 220 // send the data block
eembed 0:5459cdde6298 221 _write(buffer, 512);
eembed 0:5459cdde6298 222 return 0;
eembed 0:5459cdde6298 223 }
eembed 0:5459cdde6298 224
eembed 0:5459cdde6298 225 int SDFileSystem::disk_read(uint8_t *buffer, uint64_t block_number) {
eembed 0:5459cdde6298 226 // set read address for single block (CMD17)
eembed 0:5459cdde6298 227 if (_cmd(17, block_number * cdv) != 0) {
eembed 0:5459cdde6298 228 return 1;
eembed 0:5459cdde6298 229 }
eembed 0:5459cdde6298 230
eembed 0:5459cdde6298 231 // receive the data
eembed 0:5459cdde6298 232 _read(buffer, 512);
eembed 0:5459cdde6298 233 return 0;
eembed 0:5459cdde6298 234 }
eembed 0:5459cdde6298 235
eembed 0:5459cdde6298 236 int SDFileSystem::disk_status() { return 0; }
eembed 0:5459cdde6298 237 int SDFileSystem::disk_sync() { return 0; }
eembed 0:5459cdde6298 238 uint64_t SDFileSystem::disk_sectors() { return _sectors; }
eembed 0:5459cdde6298 239
eembed 0:5459cdde6298 240
eembed 0:5459cdde6298 241 // PRIVATE FUNCTIONS
eembed 0:5459cdde6298 242 int SDFileSystem::_cmd(int cmd, int arg) {
eembed 0:5459cdde6298 243 _cs = 0;
eembed 0:5459cdde6298 244
eembed 0:5459cdde6298 245 // send a command
eembed 0:5459cdde6298 246 _spi.write(0x40 | cmd);
eembed 0:5459cdde6298 247 _spi.write(arg >> 24);
eembed 0:5459cdde6298 248 _spi.write(arg >> 16);
eembed 0:5459cdde6298 249 _spi.write(arg >> 8);
eembed 0:5459cdde6298 250 _spi.write(arg >> 0);
eembed 0:5459cdde6298 251 _spi.write(0x95);
eembed 0:5459cdde6298 252
eembed 0:5459cdde6298 253 // wait for the repsonse (response[7] == 0)
eembed 0:5459cdde6298 254 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
eembed 0:5459cdde6298 255 int response = _spi.write(0xFF);
eembed 0:5459cdde6298 256 if (!(response & 0x80)) {
eembed 0:5459cdde6298 257 _cs = 1;
eembed 0:5459cdde6298 258 _spi.write(0xFF);
eembed 0:5459cdde6298 259 return response;
eembed 0:5459cdde6298 260 }
eembed 0:5459cdde6298 261 }
eembed 0:5459cdde6298 262 _cs = 1;
eembed 0:5459cdde6298 263 _spi.write(0xFF);
eembed 0:5459cdde6298 264 return -1; // timeout
eembed 0:5459cdde6298 265 }
eembed 0:5459cdde6298 266 int SDFileSystem::_cmdx(int cmd, int arg) {
eembed 0:5459cdde6298 267 _cs = 0;
eembed 0:5459cdde6298 268
eembed 0:5459cdde6298 269 // send a command
eembed 0:5459cdde6298 270 _spi.write(0x40 | cmd);
eembed 0:5459cdde6298 271 _spi.write(arg >> 24);
eembed 0:5459cdde6298 272 _spi.write(arg >> 16);
eembed 0:5459cdde6298 273 _spi.write(arg >> 8);
eembed 0:5459cdde6298 274 _spi.write(arg >> 0);
eembed 0:5459cdde6298 275 _spi.write(0x95);
eembed 0:5459cdde6298 276
eembed 0:5459cdde6298 277 // wait for the repsonse (response[7] == 0)
eembed 0:5459cdde6298 278 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
eembed 0:5459cdde6298 279 int response = _spi.write(0xFF);
eembed 0:5459cdde6298 280 if (!(response & 0x80)) {
eembed 0:5459cdde6298 281 return response;
eembed 0:5459cdde6298 282 }
eembed 0:5459cdde6298 283 }
eembed 0:5459cdde6298 284 _cs = 1;
eembed 0:5459cdde6298 285 _spi.write(0xFF);
eembed 0:5459cdde6298 286 return -1; // timeout
eembed 0:5459cdde6298 287 }
eembed 0:5459cdde6298 288
eembed 0:5459cdde6298 289
eembed 0:5459cdde6298 290 int SDFileSystem::_cmd58() {
eembed 0:5459cdde6298 291 _cs = 0;
eembed 0:5459cdde6298 292 int arg = 0;
eembed 0:5459cdde6298 293
eembed 0:5459cdde6298 294 // send a command
eembed 0:5459cdde6298 295 _spi.write(0x40 | 58);
eembed 0:5459cdde6298 296 _spi.write(arg >> 24);
eembed 0:5459cdde6298 297 _spi.write(arg >> 16);
eembed 0:5459cdde6298 298 _spi.write(arg >> 8);
eembed 0:5459cdde6298 299 _spi.write(arg >> 0);
eembed 0:5459cdde6298 300 _spi.write(0x95);
eembed 0:5459cdde6298 301
eembed 0:5459cdde6298 302 // wait for the repsonse (response[7] == 0)
eembed 0:5459cdde6298 303 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
eembed 0:5459cdde6298 304 int response = _spi.write(0xFF);
eembed 0:5459cdde6298 305 if (!(response & 0x80)) {
eembed 0:5459cdde6298 306 int ocr = _spi.write(0xFF) << 24;
eembed 0:5459cdde6298 307 ocr |= _spi.write(0xFF) << 16;
eembed 0:5459cdde6298 308 ocr |= _spi.write(0xFF) << 8;
eembed 0:5459cdde6298 309 ocr |= _spi.write(0xFF) << 0;
eembed 0:5459cdde6298 310 _cs = 1;
eembed 0:5459cdde6298 311 _spi.write(0xFF);
eembed 0:5459cdde6298 312 return response;
eembed 0:5459cdde6298 313 }
eembed 0:5459cdde6298 314 }
eembed 0:5459cdde6298 315 _cs = 1;
eembed 0:5459cdde6298 316 _spi.write(0xFF);
eembed 0:5459cdde6298 317 return -1; // timeout
eembed 0:5459cdde6298 318 }
eembed 0:5459cdde6298 319
eembed 0:5459cdde6298 320 int SDFileSystem::_cmd8() {
eembed 0:5459cdde6298 321 _cs = 0;
eembed 0:5459cdde6298 322
eembed 0:5459cdde6298 323 // send a command
eembed 0:5459cdde6298 324 _spi.write(0x40 | 8); // CMD8
eembed 0:5459cdde6298 325 _spi.write(0x00); // reserved
eembed 0:5459cdde6298 326 _spi.write(0x00); // reserved
eembed 0:5459cdde6298 327 _spi.write(0x01); // 3.3v
eembed 0:5459cdde6298 328 _spi.write(0xAA); // check pattern
eembed 0:5459cdde6298 329 _spi.write(0x87); // crc
eembed 0:5459cdde6298 330
eembed 0:5459cdde6298 331 // wait for the repsonse (response[7] == 0)
eembed 0:5459cdde6298 332 for (int i = 0; i < SD_COMMAND_TIMEOUT * 1000; i++) {
eembed 0:5459cdde6298 333 char response[5];
eembed 0:5459cdde6298 334 response[0] = _spi.write(0xFF);
eembed 0:5459cdde6298 335 if (!(response[0] & 0x80)) {
eembed 0:5459cdde6298 336 for (int j = 1; j < 5; j++) {
eembed 0:5459cdde6298 337 response[i] = _spi.write(0xFF);
eembed 0:5459cdde6298 338 }
eembed 0:5459cdde6298 339 _cs = 1;
eembed 0:5459cdde6298 340 _spi.write(0xFF);
eembed 0:5459cdde6298 341 return response[0];
eembed 0:5459cdde6298 342 }
eembed 0:5459cdde6298 343 }
eembed 0:5459cdde6298 344 _cs = 1;
eembed 0:5459cdde6298 345 _spi.write(0xFF);
eembed 0:5459cdde6298 346 return -1; // timeout
eembed 0:5459cdde6298 347 }
eembed 0:5459cdde6298 348
eembed 0:5459cdde6298 349 int SDFileSystem::_read(uint8_t *buffer, uint32_t length) {
eembed 0:5459cdde6298 350 _cs = 0;
eembed 0:5459cdde6298 351
eembed 0:5459cdde6298 352 // read until start byte (0xFF)
eembed 0:5459cdde6298 353 while (_spi.write(0xFF) != 0xFE);
eembed 0:5459cdde6298 354
eembed 0:5459cdde6298 355 // read data
eembed 0:5459cdde6298 356 for (int i = 0; i < length; i++) {
eembed 0:5459cdde6298 357 buffer[i] = _spi.write(0xFF);
eembed 0:5459cdde6298 358 }
eembed 0:5459cdde6298 359 _spi.write(0xFF); // checksum
eembed 0:5459cdde6298 360 _spi.write(0xFF);
eembed 0:5459cdde6298 361
eembed 0:5459cdde6298 362 _cs = 1;
eembed 0:5459cdde6298 363 _spi.write(0xFF);
eembed 0:5459cdde6298 364 return 0;
eembed 0:5459cdde6298 365 }
eembed 0:5459cdde6298 366
eembed 0:5459cdde6298 367 int SDFileSystem::_write(const uint8_t*buffer, uint32_t length) {
eembed 0:5459cdde6298 368 _cs = 0;
eembed 0:5459cdde6298 369
eembed 0:5459cdde6298 370 // indicate start of block
eembed 0:5459cdde6298 371 _spi.write(0xFE);
eembed 0:5459cdde6298 372
eembed 0:5459cdde6298 373 // write the data
eembed 0:5459cdde6298 374 for (int i = 0; i < length; i++) {
eembed 0:5459cdde6298 375 _spi.write(buffer[i]);
eembed 0:5459cdde6298 376 }
eembed 0:5459cdde6298 377
eembed 0:5459cdde6298 378 // write the checksum
eembed 0:5459cdde6298 379 _spi.write(0xFF);
eembed 0:5459cdde6298 380 _spi.write(0xFF);
eembed 0:5459cdde6298 381
eembed 0:5459cdde6298 382 // check the response token
eembed 0:5459cdde6298 383 if ((_spi.write(0xFF) & 0x1F) != 0x05) {
eembed 0:5459cdde6298 384 _cs = 1;
eembed 0:5459cdde6298 385 _spi.write(0xFF);
eembed 0:5459cdde6298 386 return 1;
eembed 0:5459cdde6298 387 }
eembed 0:5459cdde6298 388
eembed 0:5459cdde6298 389 // wait for write to finish
eembed 0:5459cdde6298 390 while (_spi.write(0xFF) == 0);
eembed 0:5459cdde6298 391
eembed 0:5459cdde6298 392 _cs = 1;
eembed 0:5459cdde6298 393 _spi.write(0xFF);
eembed 0:5459cdde6298 394 return 0;
eembed 0:5459cdde6298 395 }
eembed 0:5459cdde6298 396
eembed 0:5459cdde6298 397 static uint32_t ext_bits(unsigned char *data, int msb, int lsb) {
eembed 0:5459cdde6298 398 uint32_t bits = 0;
eembed 0:5459cdde6298 399 uint32_t size = 1 + msb - lsb;
eembed 0:5459cdde6298 400 for (int i = 0; i < size; i++) {
eembed 0:5459cdde6298 401 uint32_t position = lsb + i;
eembed 0:5459cdde6298 402 uint32_t byte = 15 - (position >> 3);
eembed 0:5459cdde6298 403 uint32_t bit = position & 0x7;
eembed 0:5459cdde6298 404 uint32_t value = (data[byte] >> bit) & 1;
eembed 0:5459cdde6298 405 bits |= value << i;
eembed 0:5459cdde6298 406 }
eembed 0:5459cdde6298 407 return bits;
eembed 0:5459cdde6298 408 }
eembed 0:5459cdde6298 409
eembed 0:5459cdde6298 410 uint64_t SDFileSystem::_sd_sectors() {
eembed 0:5459cdde6298 411 uint32_t c_size, c_size_mult, read_bl_len;
eembed 0:5459cdde6298 412 uint32_t block_len, mult, blocknr, capacity;
eembed 0:5459cdde6298 413 uint32_t hc_c_size;
eembed 0:5459cdde6298 414 uint64_t blocks;
eembed 0:5459cdde6298 415
eembed 0:5459cdde6298 416 // CMD9, Response R2 (R1 byte + 16-byte block read)
eembed 0:5459cdde6298 417 if (_cmdx(9, 0) != 0) {
eembed 0:5459cdde6298 418 debug("Didn't get a response from the disk\n");
eembed 0:5459cdde6298 419 return 0;
eembed 0:5459cdde6298 420 }
eembed 0:5459cdde6298 421
eembed 0:5459cdde6298 422 uint8_t csd[16];
eembed 0:5459cdde6298 423 if (_read(csd, 16) != 0) {
eembed 0:5459cdde6298 424 debug("Couldn't read csd response from disk\n");
eembed 0:5459cdde6298 425 return 0;
eembed 0:5459cdde6298 426 }
eembed 0:5459cdde6298 427
eembed 0:5459cdde6298 428 // csd_structure : csd[127:126]
eembed 0:5459cdde6298 429 // c_size : csd[73:62]
eembed 0:5459cdde6298 430 // c_size_mult : csd[49:47]
eembed 0:5459cdde6298 431 // read_bl_len : csd[83:80] - the *maximum* read block length
eembed 0:5459cdde6298 432
eembed 0:5459cdde6298 433 int csd_structure = ext_bits(csd, 127, 126);
eembed 0:5459cdde6298 434
eembed 0:5459cdde6298 435 switch (csd_structure) {
eembed 0:5459cdde6298 436 case 0:
eembed 0:5459cdde6298 437 cdv = 512;
eembed 0:5459cdde6298 438 c_size = ext_bits(csd, 73, 62);
eembed 0:5459cdde6298 439 c_size_mult = ext_bits(csd, 49, 47);
eembed 0:5459cdde6298 440 read_bl_len = ext_bits(csd, 83, 80);
eembed 0:5459cdde6298 441
eembed 0:5459cdde6298 442 block_len = 1 << read_bl_len;
eembed 0:5459cdde6298 443 mult = 1 << (c_size_mult + 2);
eembed 0:5459cdde6298 444 blocknr = (c_size + 1) * mult;
eembed 0:5459cdde6298 445 capacity = blocknr * block_len;
eembed 0:5459cdde6298 446 blocks = capacity / 512;
eembed 0:5459cdde6298 447 debug_if(SD_DBG, "\n\rSDCard\n\rc_size: %d \n\rcapacity: %ld \n\rsectors: %lld\n\r", c_size, capacity, blocks);
eembed 0:5459cdde6298 448 break;
eembed 0:5459cdde6298 449
eembed 0:5459cdde6298 450 case 1:
eembed 0:5459cdde6298 451 cdv = 1;
eembed 0:5459cdde6298 452 hc_c_size = ext_bits(csd, 63, 48);
eembed 0:5459cdde6298 453 blocks = (hc_c_size+1)*1024;
eembed 0:5459cdde6298 454 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);
eembed 0:5459cdde6298 455 break;
eembed 0:5459cdde6298 456
eembed 0:5459cdde6298 457 default:
eembed 0:5459cdde6298 458 debug("CSD struct unsupported\r\n");
eembed 0:5459cdde6298 459 return 0;
eembed 0:5459cdde6298 460 };
eembed 0:5459cdde6298 461 return blocks;
eembed 0:5459cdde6298 462 }