Cybersecurity Project / Mbed 2 deprecated sd_duplicator

11/29

Dependencies:   mbed-rtos mbed wolfSSL

Fork of sd_duplicator by Titi Asrat

SDBlock.cpp@4:2bcb836ba0de, 2016-12-13 (annotated)

Committer:
jlharper
Date:
Tue Dec 13 05:54:12 2016 +0000
Revision:
4:2bcb836ba0de
Parent:
1:7827a11dc627 
everything works. signing stilll needs to be verified

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jlharper 1:7827a11dc627 1 /* mbed Microcontroller Library
jlharper 1:7827a11dc627 2 * Copyright (c) 2006-2012 ARM Limited
jlharper 1:7827a11dc627 3 *
jlharper 1:7827a11dc627 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
jlharper 1:7827a11dc627 5 * of this software and associated documentation files (the "Software"), to deal
jlharper 1:7827a11dc627 6 * in the Software without restriction, including without limitation the rights
jlharper 1:7827a11dc627 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
jlharper 1:7827a11dc627 8 * copies of the Software, and to permit persons to whom the Software is
jlharper 1:7827a11dc627 9 * furnished to do so, subject to the following conditions:
jlharper 1:7827a11dc627 10 *
jlharper 1:7827a11dc627 11 * The above copyright notice and this permission notice shall be included in
jlharper 1:7827a11dc627 12 * all copies or substantial portions of the Software.
jlharper 1:7827a11dc627 13 *
jlharper 1:7827a11dc627 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
jlharper 1:7827a11dc627 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
jlharper 1:7827a11dc627 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
jlharper 1:7827a11dc627 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
jlharper 1:7827a11dc627 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
jlharper 1:7827a11dc627 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
jlharper 1:7827a11dc627 20 * SOFTWARE.
jlharper 1:7827a11dc627 21 */
jlharper 1:7827a11dc627 22 /* Introduction
jlharper 1:7827a11dc627 23 * ------------
jlharper 1:7827a11dc627 24 * SD and MMC cards support a number of interfaces, but common to them all
jlharper 1:7827a11dc627 25 * is one based on SPI. This is the one I'm implmenting because it means
jlharper 1:7827a11dc627 26 * it is much more portable even though not so performant, and we already
jlharper 1:7827a11dc627 27 * have the mbed SPI Interface!
jlharper 1:7827a11dc627 28 *
jlharper 1:7827a11dc627 29 * The main reference I'm using is Chapter 7, "SPI Mode" of:
jlharper 1:7827a11dc627 30 * http://www.sdcard.org/developers/tech/sdcard/pls/Simplified_Physical_Layer_Spec.pdf
jlharper 1:7827a11dc627 31 *
jlharper 1:7827a11dc627 32 * SPI Startup
jlharper 1:7827a11dc627 33 * -----------
jlharper 1:7827a11dc627 34 * The SD card powers up in SD mode. The SPI interface mode is selected by
jlharper 1:7827a11dc627 35 * asserting CS low and sending the reset command (CMD0). The card will
jlharper 1:7827a11dc627 36 * respond with a (R1) response.
jlharper 1:7827a11dc627 37 *
jlharper 1:7827a11dc627 38 * CMD8 is optionally sent to determine the voltage range supported, and
jlharper 1:7827a11dc627 39 * indirectly determine whether it is a version 1.x SD/non-SD card or
jlharper 1:7827a11dc627 40 * version 2.x. I'll just ignore this for now.
jlharper 1:7827a11dc627 41 *
jlharper 1:7827a11dc627 42 * ACMD41 is repeatedly issued to initialise the card, until "in idle"
jlharper 1:7827a11dc627 43 * (bit 0) of the R1 response goes to '0', indicating it is initialised.
jlharper 1:7827a11dc627 44 *
jlharper 1:7827a11dc627 45 * You should also indicate whether the host supports High Capicity cards,
jlharper 1:7827a11dc627 46 * and check whether the card is high capacity - i'll also ignore this
jlharper 1:7827a11dc627 47 *
jlharper 1:7827a11dc627 48 * SPI Protocol
jlharper 1:7827a11dc627 49 * ------------
jlharper 1:7827a11dc627 50 * The SD SPI protocol is based on transactions made up of 8-bit words, with
jlharper 1:7827a11dc627 51 * the host starting every bus transaction by asserting the CS signal low. The
jlharper 1:7827a11dc627 52 * card always responds to commands, data blocks and errors.
jlharper 1:7827a11dc627 53 *
jlharper 1:7827a11dc627 54 * The protocol supports a CRC, but by default it is off (except for the
jlharper 1:7827a11dc627 55 * first reset CMD0, where the CRC can just be pre-calculated, and CMD8)
jlharper 1:7827a11dc627 56 * I'll leave the CRC off I think!
jlharper 1:7827a11dc627 57 *
jlharper 1:7827a11dc627 58 * Standard capacity cards have variable data block sizes, whereas High
jlharper 1:7827a11dc627 59 * Capacity cards fix the size of data block to 512 bytes. I'll therefore
jlharper 1:7827a11dc627 60 * just always use the Standard Capacity cards with a block size of 512 bytes.
jlharper 1:7827a11dc627 61 * This is set with CMD16.
jlharper 1:7827a11dc627 62 *
jlharper 1:7827a11dc627 63 * You can read and write single blocks (CMD17, CMD25) or multiple blocks
jlharper 1:7827a11dc627 64 * (CMD18, CMD25). For simplicity, I'll just use single block accesses. When
jlharper 1:7827a11dc627 65 * the card gets a read command, it responds with a response token, and then
jlharper 1:7827a11dc627 66 * a data token or an error.
jlharper 1:7827a11dc627 67 *
jlharper 1:7827a11dc627 68 * SPI Command Format
jlharper 1:7827a11dc627 69 * ------------------
jlharper 1:7827a11dc627 70 * Commands are 6-bytes long, containing the command, 32-bit argument, and CRC.
jlharper 1:7827a11dc627 71 *
jlharper 1:7827a11dc627 72 * +---------------+------------+------------+-----------+----------+--------------+
jlharper 1:7827a11dc627 73 * | 01 | cmd[5:0] | arg[31:24] | arg[23:16] | arg[15:8] | arg[7:0] | crc[6:0] | 1 |
jlharper 1:7827a11dc627 74 * +---------------+------------+------------+-----------+----------+--------------+
jlharper 1:7827a11dc627 75 *
jlharper 1:7827a11dc627 76 * As I'm not using CRC, I can fix that byte to what is needed for CMD0 (0x95)
jlharper 1:7827a11dc627 77 *
jlharper 1:7827a11dc627 78 * All Application Specific commands shall be preceded with APP_CMD (CMD55).
jlharper 1:7827a11dc627 79 *
jlharper 1:7827a11dc627 80 * SPI Response Format
jlharper 1:7827a11dc627 81 * -------------------
jlharper 1:7827a11dc627 82 * The main response format (R1) is a status byte (normally zero). Key flags:
jlharper 1:7827a11dc627 83 * idle - 1 if the card is in an idle state/initialising
jlharper 1:7827a11dc627 84 * cmd - 1 if an illegal command code was detected
jlharper 1:7827a11dc627 85 *
jlharper 1:7827a11dc627 86 * +-------------------------------------------------+
jlharper 1:7827a11dc627 87 * R1 | 0 | arg | addr | seq | crc | cmd | erase | idle |
jlharper 1:7827a11dc627 88 * +-------------------------------------------------+
jlharper 1:7827a11dc627 89 *
jlharper 1:7827a11dc627 90 * R1b is the same, except it is followed by a busy signal (zeros) until
jlharper 1:7827a11dc627 91 * the first non-zero byte when it is ready again.
jlharper 1:7827a11dc627 92 *
jlharper 1:7827a11dc627 93 * Data Response Token
jlharper 1:7827a11dc627 94 * -------------------
jlharper 1:7827a11dc627 95 * Every data block written to the card is acknowledged by a byte
jlharper 1:7827a11dc627 96 * response token
jlharper 1:7827a11dc627 97 *
jlharper 1:7827a11dc627 98 * +----------------------+
jlharper 1:7827a11dc627 99 * | xxx | 0 | status | 1 |
jlharper 1:7827a11dc627 100 * +----------------------+
jlharper 1:7827a11dc627 101 * 010 - OK!
jlharper 1:7827a11dc627 102 * 101 - CRC Error
jlharper 1:7827a11dc627 103 * 110 - Write Error
jlharper 1:7827a11dc627 104 *
jlharper 1:7827a11dc627 105 * Single Block Read and Write
jlharper 1:7827a11dc627 106 * ---------------------------
jlharper 1:7827a11dc627 107 *
jlharper 1:7827a11dc627 108 * Block transfers have a byte header, followed by the data, followed
jlharper 1:7827a11dc627 109 * by a 16-bit CRC. In our case, the data will always be 512 bytes.
jlharper 1:7827a11dc627 110 *
jlharper 1:7827a11dc627 111 * +------+---------+---------+- - - -+---------+-----------+----------+
jlharper 1:7827a11dc627 112 * | 0xFE | data[0] | data[1] | | data[n] | crc[15:8] | crc[7:0] |
jlharper 1:7827a11dc627 113 * +------+---------+---------+- - - -+---------+-----------+----------+
jlharper 1:7827a11dc627 114 */
jlharper 1:7827a11dc627 115 #include "SDBlock.h"
jlharper 1:7827a11dc627 116 #include "mbed_debug.h"
jlharper 1:7827a11dc627 117
jlharper 1:7827a11dc627 118 #define SD_COMMAND_TIMEOUT 5000
jlharper 1:7827a11dc627 119
jlharper 1:7827a11dc627 120 #define SD_DBG 0
jlharper 1:7827a11dc627 121
jlharper 1:7827a11dc627 122 SDBlock::SDBlock(PinName mosi, PinName miso, PinName sclk, PinName cs) :
jlharper 1:7827a11dc627 123 _spi(mosi, miso, sclk), _cs(cs), _is_initialized(0) {
jlharper 1:7827a11dc627 124 _cs = 1;
jlharper 1:7827a11dc627 125
jlharper 1:7827a11dc627 126 // Set default to 100kHz for initialisation and 1MHz for data transfer
jlharper 1:7827a11dc627 127 _init_sck = 100000;
jlharper 1:7827a11dc627 128 _transfer_sck = 1000000;
jlharper 1:7827a11dc627 129 }
jlharper 1:7827a11dc627 130
jlharper 1:7827a11dc627 131 #define R1_IDLE_STATE (1 << 0)
jlharper 1:7827a11dc627 132 #define R1_ERASE_RESET (1 << 1)
jlharper 1:7827a11dc627 133 #define R1_ILLEGAL_COMMAND (1 << 2)
jlharper 1:7827a11dc627 134 #define R1_COM_CRC_ERROR (1 << 3)
jlharper 1:7827a11dc627 135 #define R1_ERASE_SEQUENCE_ERROR (1 << 4)
jlharper 1:7827a11dc627 136 #define R1_ADDRESS_ERROR (1 << 5)
jlharper 1:7827a11dc627 137 #define R1_PARAMETER_ERROR (1 << 6)
jlharper 1:7827a11dc627 138
jlharper 1:7827a11dc627 139 // Types
jlharper 1:7827a11dc627 140 // - v1.x Standard Capacity
jlharper 1:7827a11dc627 141 // - v2.x Standard Capacity
jlharper 1:7827a11dc627 142 // - v2.x High Capacity
jlharper 1:7827a11dc627 143 // - Not recognised as an SD Card
jlharper 1:7827a11dc627 144 #define SDCARD_FAIL 0
jlharper 1:7827a11dc627 145 #define SDCARD_V1 1
jlharper 1:7827a11dc627 146 #define SDCARD_V2 2
jlharper 1:7827a11dc627 147 #define SDCARD_V2HC 3
jlharper 1:7827a11dc627 148
jlharper 1:7827a11dc627 149 int SDBlock::initialise_card() {
jlharper 1:7827a11dc627 150 // Set to SCK for initialisation, and clock card with cs = 1
jlharper 1:7827a11dc627 151 _spi.frequency(_init_sck);
jlharper 1:7827a11dc627 152 _cs = 1;
jlharper 1:7827a11dc627 153 for (int i = 0; i < 16; i++) {
jlharper 1:7827a11dc627 154 _spi.write(0xFF);
jlharper 1:7827a11dc627 155 }
jlharper 1:7827a11dc627 156
jlharper 1:7827a11dc627 157 // send CMD0, should return with all zeros except IDLE STATE set (bit 0)
jlharper 1:7827a11dc627 158 if (_cmd(0, 0) != R1_IDLE_STATE) {
jlharper 1:7827a11dc627 159 debug("No disk, or could not put SD card in to SPI idle state\n");
jlharper 1:7827a11dc627 160 return SDCARD_FAIL;
jlharper 1:7827a11dc627 161 }
jlharper 1:7827a11dc627 162
jlharper 1:7827a11dc627 163 // send CMD8 to determine whther it is ver 2.x
jlharper 1:7827a11dc627 164 int r = _cmd8();
jlharper 1:7827a11dc627 165 if (r == R1_IDLE_STATE) {
jlharper 1:7827a11dc627 166 return initialise_card_v2();
jlharper 1:7827a11dc627 167 } else if (r == (R1_IDLE_STATE | R1_ILLEGAL_COMMAND)) {
jlharper 1:7827a11dc627 168 return initialise_card_v1();
jlharper 1:7827a11dc627 169 } else {
jlharper 1:7827a11dc627 170 debug("Not in idle state after sending CMD8 (not an SD card?)\n");
jlharper 1:7827a11dc627 171 return SDCARD_FAIL;
jlharper 1:7827a11dc627 172 }
jlharper 1:7827a11dc627 173 }
jlharper 1:7827a11dc627 174
jlharper 1:7827a11dc627 175 int SDBlock::initialise_card_v1() {
jlharper 1:7827a11dc627 176 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
jlharper 1:7827a11dc627 177 _cmd(55, 0);
jlharper 1:7827a11dc627 178 if (_cmd(41, 0) == 0) {
jlharper 1:7827a11dc627 179 cdv = 512;
jlharper 1:7827a11dc627 180 debug_if(SD_DBG, "\n\rInit: SEDCARD_V1\n\r");
jlharper 1:7827a11dc627 181 return SDCARD_V1;
jlharper 1:7827a11dc627 182 }
jlharper 1:7827a11dc627 183 }
jlharper 1:7827a11dc627 184
jlharper 1:7827a11dc627 185 debug("Timeout waiting for v1.x card\n");
jlharper 1:7827a11dc627 186 return SDCARD_FAIL;
jlharper 1:7827a11dc627 187 }
jlharper 1:7827a11dc627 188
jlharper 1:7827a11dc627 189 int SDBlock::initialise_card_v2() {
jlharper 1:7827a11dc627 190 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
jlharper 1:7827a11dc627 191 wait_ms(50);
jlharper 1:7827a11dc627 192 _cmd58();
jlharper 1:7827a11dc627 193 _cmd(55, 0);
jlharper 1:7827a11dc627 194 if (_cmd(41, 0x40000000) == 0) {
jlharper 1:7827a11dc627 195 _cmd58();
jlharper 1:7827a11dc627 196 debug_if(SD_DBG, "\n\rInit: SDCARD_V2\n\r");
jlharper 1:7827a11dc627 197 cdv = 1;
jlharper 1:7827a11dc627 198 return SDCARD_V2;
jlharper 1:7827a11dc627 199 }
jlharper 1:7827a11dc627 200 }
jlharper 1:7827a11dc627 201
jlharper 1:7827a11dc627 202 debug("Timeout waiting for v2.x card\n");
jlharper 1:7827a11dc627 203 return SDCARD_FAIL;
jlharper 1:7827a11dc627 204 }
jlharper 1:7827a11dc627 205
jlharper 1:7827a11dc627 206 int SDBlock::disk_initialize() {
jlharper 1:7827a11dc627 207 _is_initialized = initialise_card();
jlharper 1:7827a11dc627 208 if (_is_initialized == 0) {
jlharper 1:7827a11dc627 209 debug("Fail to initialize card\n");
jlharper 1:7827a11dc627 210 return 1;
jlharper 1:7827a11dc627 211 }
jlharper 1:7827a11dc627 212 debug_if(SD_DBG, "init card = %d\n", _is_initialized);
jlharper 1:7827a11dc627 213 _sectors = _sd_sectors();
jlharper 1:7827a11dc627 214
jlharper 1:7827a11dc627 215 // Set block length to 512 (CMD16)
jlharper 1:7827a11dc627 216 if (_cmd(16, 512) != 0) {
jlharper 1:7827a11dc627 217 debug("Set 512-byte block timed out\n");
jlharper 1:7827a11dc627 218 return 1;
jlharper 1:7827a11dc627 219 }
jlharper 1:7827a11dc627 220
jlharper 1:7827a11dc627 221 // Set SCK for data transfer
jlharper 1:7827a11dc627 222 _spi.frequency(_transfer_sck);
jlharper 1:7827a11dc627 223 return 0;
jlharper 1:7827a11dc627 224 }
jlharper 1:7827a11dc627 225
jlharper 1:7827a11dc627 226 int SDBlock::disk_write(const uint8_t* buffer, uint32_t block_number, uint32_t count) {
jlharper 1:7827a11dc627 227 if (!_is_initialized) {
jlharper 1:7827a11dc627 228 return -1;
jlharper 1:7827a11dc627 229 }
jlharper 1:7827a11dc627 230
jlharper 1:7827a11dc627 231 for (uint32_t b = block_number; b < block_number + count; b++) {
jlharper 1:7827a11dc627 232 // set write address for single block (CMD24)
jlharper 1:7827a11dc627 233 if (_cmd(24, b * cdv) != 0) {
jlharper 1:7827a11dc627 234 return 1;
jlharper 1:7827a11dc627 235 }
jlharper 1:7827a11dc627 236
jlharper 1:7827a11dc627 237 // send the data block
jlharper 1:7827a11dc627 238 _write(buffer, 512);
jlharper 1:7827a11dc627 239 buffer += 512;
jlharper 1:7827a11dc627 240 }
jlharper 1:7827a11dc627 241
jlharper 1:7827a11dc627 242 return 0;
jlharper 1:7827a11dc627 243 }
jlharper 1:7827a11dc627 244
jlharper 1:7827a11dc627 245 int SDBlock::disk_read(uint8_t* buffer, uint32_t block_number, uint32_t count) {
jlharper 1:7827a11dc627 246 if (!_is_initialized) {
jlharper 1:7827a11dc627 247 return -1;
jlharper 1:7827a11dc627 248 }
jlharper 1:7827a11dc627 249
jlharper 1:7827a11dc627 250 for (uint32_t b = block_number; b < block_number + count; b++) {
jlharper 1:7827a11dc627 251 // set read address for single block (CMD17)
jlharper 1:7827a11dc627 252 if (_cmd(17, b * cdv) != 0) {
jlharper 1:7827a11dc627 253 return 1;
jlharper 1:7827a11dc627 254 }
jlharper 1:7827a11dc627 255
jlharper 1:7827a11dc627 256 // receive the data
jlharper 1:7827a11dc627 257 _read(buffer, 512);
jlharper 1:7827a11dc627 258 buffer += 512;
jlharper 1:7827a11dc627 259 }
jlharper 1:7827a11dc627 260
jlharper 1:7827a11dc627 261 return 0;
jlharper 1:7827a11dc627 262 }
jlharper 1:7827a11dc627 263
jlharper 1:7827a11dc627 264 int SDBlock::disk_status() {
jlharper 1:7827a11dc627 265 // FATFileSystem::disk_status() returns 0 when initialized
jlharper 1:7827a11dc627 266 if (_is_initialized) {
jlharper 1:7827a11dc627 267 return 0;
jlharper 1:7827a11dc627 268 } else {
jlharper 1:7827a11dc627 269 return 1;
jlharper 1:7827a11dc627 270 }
jlharper 1:7827a11dc627 271 }
jlharper 1:7827a11dc627 272
jlharper 1:7827a11dc627 273 int SDBlock::disk_sync() { return 0; }
jlharper 1:7827a11dc627 274 uint32_t SDBlock::disk_sectors() { return _sectors; }
jlharper 1:7827a11dc627 275
jlharper 1:7827a11dc627 276
jlharper 1:7827a11dc627 277 // PRIVATE FUNCTIONS
jlharper 1:7827a11dc627 278 int SDBlock::_cmd(int cmd, int arg) {
jlharper 1:7827a11dc627 279 _cs = 0;
jlharper 1:7827a11dc627 280
jlharper 1:7827a11dc627 281 // send a command
jlharper 1:7827a11dc627 282 _spi.write(0x40 | cmd);
jlharper 1:7827a11dc627 283 _spi.write(arg >> 24);
jlharper 1:7827a11dc627 284 _spi.write(arg >> 16);
jlharper 1:7827a11dc627 285 _spi.write(arg >> 8);
jlharper 1:7827a11dc627 286 _spi.write(arg >> 0);
jlharper 1:7827a11dc627 287 _spi.write(0x95);
jlharper 1:7827a11dc627 288
jlharper 1:7827a11dc627 289 // wait for the repsonse (response[7] == 0)
jlharper 1:7827a11dc627 290 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
jlharper 1:7827a11dc627 291 int response = _spi.write(0xFF);
jlharper 1:7827a11dc627 292 if (!(response & 0x80)) {
jlharper 1:7827a11dc627 293 _cs = 1;
jlharper 1:7827a11dc627 294 _spi.write(0xFF);
jlharper 1:7827a11dc627 295 return response;
jlharper 1:7827a11dc627 296 }
jlharper 1:7827a11dc627 297 }
jlharper 1:7827a11dc627 298 _cs = 1;
jlharper 1:7827a11dc627 299 _spi.write(0xFF);
jlharper 1:7827a11dc627 300 return -1; // timeout
jlharper 1:7827a11dc627 301 }
jlharper 1:7827a11dc627 302 int SDBlock::_cmdx(int cmd, int arg) {
jlharper 1:7827a11dc627 303 _cs = 0;
jlharper 1:7827a11dc627 304
jlharper 1:7827a11dc627 305 // send a command
jlharper 1:7827a11dc627 306 _spi.write(0x40 | cmd);
jlharper 1:7827a11dc627 307 _spi.write(arg >> 24);
jlharper 1:7827a11dc627 308 _spi.write(arg >> 16);
jlharper 1:7827a11dc627 309 _spi.write(arg >> 8);
jlharper 1:7827a11dc627 310 _spi.write(arg >> 0);
jlharper 1:7827a11dc627 311 _spi.write(0x95);
jlharper 1:7827a11dc627 312
jlharper 1:7827a11dc627 313 // wait for the repsonse (response[7] == 0)
jlharper 1:7827a11dc627 314 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
jlharper 1:7827a11dc627 315 int response = _spi.write(0xFF);
jlharper 1:7827a11dc627 316 if (!(response & 0x80)) {
jlharper 1:7827a11dc627 317 return response;
jlharper 1:7827a11dc627 318 }
jlharper 1:7827a11dc627 319 }
jlharper 1:7827a11dc627 320 _cs = 1;
jlharper 1:7827a11dc627 321 _spi.write(0xFF);
jlharper 1:7827a11dc627 322 return -1; // timeout
jlharper 1:7827a11dc627 323 }
jlharper 1:7827a11dc627 324
jlharper 1:7827a11dc627 325
jlharper 1:7827a11dc627 326 int SDBlock::_cmd58() {
jlharper 1:7827a11dc627 327 _cs = 0;
jlharper 1:7827a11dc627 328 int arg = 0;
jlharper 1:7827a11dc627 329
jlharper 1:7827a11dc627 330 // send a command
jlharper 1:7827a11dc627 331 _spi.write(0x40 | 58);
jlharper 1:7827a11dc627 332 _spi.write(arg >> 24);
jlharper 1:7827a11dc627 333 _spi.write(arg >> 16);
jlharper 1:7827a11dc627 334 _spi.write(arg >> 8);
jlharper 1:7827a11dc627 335 _spi.write(arg >> 0);
jlharper 1:7827a11dc627 336 _spi.write(0x95);
jlharper 1:7827a11dc627 337
jlharper 1:7827a11dc627 338 // wait for the repsonse (response[7] == 0)
jlharper 1:7827a11dc627 339 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
jlharper 1:7827a11dc627 340 int response = _spi.write(0xFF);
jlharper 1:7827a11dc627 341 if (!(response & 0x80)) {
jlharper 1:7827a11dc627 342 int ocr = _spi.write(0xFF) << 24;
jlharper 1:7827a11dc627 343 ocr |= _spi.write(0xFF) << 16;
jlharper 1:7827a11dc627 344 ocr |= _spi.write(0xFF) << 8;
jlharper 1:7827a11dc627 345 ocr |= _spi.write(0xFF) << 0;
jlharper 1:7827a11dc627 346 _cs = 1;
jlharper 1:7827a11dc627 347 _spi.write(0xFF);
jlharper 1:7827a11dc627 348 return response;
jlharper 1:7827a11dc627 349 }
jlharper 1:7827a11dc627 350 }
jlharper 1:7827a11dc627 351 _cs = 1;
jlharper 1:7827a11dc627 352 _spi.write(0xFF);
jlharper 1:7827a11dc627 353 return -1; // timeout
jlharper 1:7827a11dc627 354 }
jlharper 1:7827a11dc627 355
jlharper 1:7827a11dc627 356 int SDBlock::_cmd8() {
jlharper 1:7827a11dc627 357 _cs = 0;
jlharper 1:7827a11dc627 358
jlharper 1:7827a11dc627 359 // send a command
jlharper 1:7827a11dc627 360 _spi.write(0x40 | 8); // CMD8
jlharper 1:7827a11dc627 361 _spi.write(0x00); // reserved
jlharper 1:7827a11dc627 362 _spi.write(0x00); // reserved
jlharper 1:7827a11dc627 363 _spi.write(0x01); // 3.3v
jlharper 1:7827a11dc627 364 _spi.write(0xAA); // check pattern
jlharper 1:7827a11dc627 365 _spi.write(0x87); // crc
jlharper 1:7827a11dc627 366
jlharper 1:7827a11dc627 367 // wait for the repsonse (response[7] == 0)
jlharper 1:7827a11dc627 368 for (int i = 0; i < SD_COMMAND_TIMEOUT * 1000; i++) {
jlharper 1:7827a11dc627 369 char response[5];
jlharper 1:7827a11dc627 370 response[0] = _spi.write(0xFF);
jlharper 1:7827a11dc627 371 if (!(response[0] & 0x80)) {
jlharper 1:7827a11dc627 372 for (int j = 1; j < 5; j++) {
jlharper 1:7827a11dc627 373 response[i] = _spi.write(0xFF);
jlharper 1:7827a11dc627 374 }
jlharper 1:7827a11dc627 375 _cs = 1;
jlharper 1:7827a11dc627 376 _spi.write(0xFF);
jlharper 1:7827a11dc627 377 return response[0];
jlharper 1:7827a11dc627 378 }
jlharper 1:7827a11dc627 379 }
jlharper 1:7827a11dc627 380 _cs = 1;
jlharper 1:7827a11dc627 381 _spi.write(0xFF);
jlharper 1:7827a11dc627 382 return -1; // timeout
jlharper 1:7827a11dc627 383 }
jlharper 1:7827a11dc627 384
jlharper 1:7827a11dc627 385 int SDBlock::_read(uint8_t *buffer, uint32_t length) {
jlharper 1:7827a11dc627 386 _cs = 0;
jlharper 1:7827a11dc627 387
jlharper 1:7827a11dc627 388 // read until start byte (0xFF)
jlharper 1:7827a11dc627 389 while (_spi.write(0xFF) != 0xFE);
jlharper 1:7827a11dc627 390
jlharper 1:7827a11dc627 391 // read data
jlharper 1:7827a11dc627 392 for (uint32_t i = 0; i < length; i++) {
jlharper 1:7827a11dc627 393 buffer[i] = _spi.write(0xFF);
jlharper 1:7827a11dc627 394 }
jlharper 1:7827a11dc627 395 _spi.write(0xFF); // checksum
jlharper 1:7827a11dc627 396 _spi.write(0xFF);
jlharper 1:7827a11dc627 397
jlharper 1:7827a11dc627 398 _cs = 1;
jlharper 1:7827a11dc627 399 _spi.write(0xFF);
jlharper 1:7827a11dc627 400 return 0;
jlharper 1:7827a11dc627 401 }
jlharper 1:7827a11dc627 402
jlharper 1:7827a11dc627 403 int SDBlock::_write(const uint8_t*buffer, uint32_t length) {
jlharper 1:7827a11dc627 404 _cs = 0;
jlharper 1:7827a11dc627 405
jlharper 1:7827a11dc627 406 // indicate start of block
jlharper 1:7827a11dc627 407 _spi.write(0xFE);
jlharper 1:7827a11dc627 408
jlharper 1:7827a11dc627 409 // write the data
jlharper 1:7827a11dc627 410 for (uint32_t i = 0; i < length; i++) {
jlharper 1:7827a11dc627 411 _spi.write(buffer[i]);
jlharper 1:7827a11dc627 412 }
jlharper 1:7827a11dc627 413
jlharper 1:7827a11dc627 414 // write the checksum
jlharper 1:7827a11dc627 415 _spi.write(0xFF);
jlharper 1:7827a11dc627 416 _spi.write(0xFF);
jlharper 1:7827a11dc627 417
jlharper 1:7827a11dc627 418 // check the response token
jlharper 1:7827a11dc627 419 if ((_spi.write(0xFF) & 0x1F) != 0x05) {
jlharper 1:7827a11dc627 420 _cs = 1;
jlharper 1:7827a11dc627 421 _spi.write(0xFF);
jlharper 1:7827a11dc627 422 return 1;
jlharper 1:7827a11dc627 423 }
jlharper 1:7827a11dc627 424
jlharper 1:7827a11dc627 425 // wait for write to finish
jlharper 1:7827a11dc627 426 while (_spi.write(0xFF) == 0);
jlharper 1:7827a11dc627 427
jlharper 1:7827a11dc627 428 _cs = 1;
jlharper 1:7827a11dc627 429 _spi.write(0xFF);
jlharper 1:7827a11dc627 430 return 0;
jlharper 1:7827a11dc627 431 }
jlharper 1:7827a11dc627 432
jlharper 1:7827a11dc627 433 static uint32_t ext_bits(unsigned char *data, int msb, int lsb) {
jlharper 1:7827a11dc627 434 uint32_t bits = 0;
jlharper 1:7827a11dc627 435 uint32_t size = 1 + msb - lsb;
jlharper 1:7827a11dc627 436 for (uint32_t i = 0; i < size; i++) {
jlharper 1:7827a11dc627 437 uint32_t position = lsb + i;
jlharper 1:7827a11dc627 438 uint32_t byte = 15 - (position >> 3);
jlharper 1:7827a11dc627 439 uint32_t bit = position & 0x7;
jlharper 1:7827a11dc627 440 uint32_t value = (data[byte] >> bit) & 1;
jlharper 1:7827a11dc627 441 bits |= value << i;
jlharper 1:7827a11dc627 442 }
jlharper 1:7827a11dc627 443 return bits;
jlharper 1:7827a11dc627 444 }
jlharper 1:7827a11dc627 445
jlharper 1:7827a11dc627 446 uint32_t SDBlock::_sd_sectors() {
jlharper 1:7827a11dc627 447 uint32_t c_size, c_size_mult, read_bl_len;
jlharper 1:7827a11dc627 448 uint32_t block_len, mult, blocknr, capacity;
jlharper 1:7827a11dc627 449 uint32_t hc_c_size;
jlharper 1:7827a11dc627 450 uint32_t blocks;
jlharper 1:7827a11dc627 451
jlharper 1:7827a11dc627 452 // CMD9, Response R2 (R1 byte + 16-byte block read)
jlharper 1:7827a11dc627 453 if (_cmdx(9, 0) != 0) {
jlharper 1:7827a11dc627 454 debug("Didn't get a response from the disk\n");
jlharper 1:7827a11dc627 455 return 0;
jlharper 1:7827a11dc627 456 }
jlharper 1:7827a11dc627 457
jlharper 1:7827a11dc627 458 uint8_t csd[16];
jlharper 1:7827a11dc627 459 if (_read(csd, 16) != 0) {
jlharper 1:7827a11dc627 460 debug("Couldn't read csd response from disk\n");
jlharper 1:7827a11dc627 461 return 0;
jlharper 1:7827a11dc627 462 }
jlharper 1:7827a11dc627 463
jlharper 1:7827a11dc627 464 // csd_structure : csd[127:126]
jlharper 1:7827a11dc627 465 // c_size : csd[73:62]
jlharper 1:7827a11dc627 466 // c_size_mult : csd[49:47]
jlharper 1:7827a11dc627 467 // read_bl_len : csd[83:80] - the *maximum* read block length
jlharper 1:7827a11dc627 468
jlharper 1:7827a11dc627 469 int csd_structure = ext_bits(csd, 127, 126);
jlharper 1:7827a11dc627 470
jlharper 1:7827a11dc627 471 switch (csd_structure) {
jlharper 1:7827a11dc627 472 case 0:
jlharper 1:7827a11dc627 473 cdv = 512;
jlharper 1:7827a11dc627 474 c_size = ext_bits(csd, 73, 62);
jlharper 1:7827a11dc627 475 c_size_mult = ext_bits(csd, 49, 47);
jlharper 1:7827a11dc627 476 read_bl_len = ext_bits(csd, 83, 80);
jlharper 1:7827a11dc627 477
jlharper 1:7827a11dc627 478 block_len = 1 << read_bl_len;
jlharper 1:7827a11dc627 479 mult = 1 << (c_size_mult + 2);
jlharper 1:7827a11dc627 480 blocknr = (c_size + 1) * mult;
jlharper 1:7827a11dc627 481 capacity = blocknr * block_len;
jlharper 1:7827a11dc627 482 blocks = capacity / 512;
jlharper 1:7827a11dc627 483 debug_if(SD_DBG, "\n\rSDCard\n\rc_size: %d \n\rcapacity: %ld \n\rsectors: %lld\n\r", c_size, capacity, blocks);
jlharper 1:7827a11dc627 484 break;
jlharper 1:7827a11dc627 485
jlharper 1:7827a11dc627 486 case 1:
jlharper 1:7827a11dc627 487 cdv = 1;
jlharper 1:7827a11dc627 488 hc_c_size = ext_bits(csd, 63, 48);
jlharper 1:7827a11dc627 489 blocks = (hc_c_size+1)*1024;
jlharper 1:7827a11dc627 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);
jlharper 1:7827a11dc627 491 break;
jlharper 1:7827a11dc627 492
jlharper 1:7827a11dc627 493 default:
jlharper 1:7827a11dc627 494 debug("CSD struct unsupported\r\n");
jlharper 1:7827a11dc627 495 return 0;
jlharper 1:7827a11dc627 496 };
jlharper 1:7827a11dc627 497 return blocks;
jlharper 1:7827a11dc627 498 }