Geo Electronics "Show2Me" / Mbed 2 deprecated GEO_SHOW2ME_F411RE

Show2Me control FW, initial shared version

Dependencies:   SDFileSystem_HelloWorld mbed FATFileSystem

Fork of 000_GEO_SHOW2ME_OK_F411RE by Walter Trovo

/media/uploads/walter76/img-1277.jpg

SDFileSystem/SDFileSystem.cpp@2:bbc3e860fa3d, 2018-02-13 (annotated)

Committer:
walter76
Date:
Tue Feb 13 08:22:23 2018 +0000
Revision:
2:bbc3e860fa3d
Preliminary version used to test all HW sections

Who changed what in which revision?

UserRevisionLine numberNew contents of line
walter76 2:bbc3e860fa3d 1 /* mbed Microcontroller Library
walter76 2:bbc3e860fa3d 2 * Copyright (c) 2006-2012 ARM Limited
walter76 2:bbc3e860fa3d 3 *
walter76 2:bbc3e860fa3d 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
walter76 2:bbc3e860fa3d 5 * of this software and associated documentation files (the "Software"), to deal
walter76 2:bbc3e860fa3d 6 * in the Software without restriction, including without limitation the rights
walter76 2:bbc3e860fa3d 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
walter76 2:bbc3e860fa3d 8 * copies of the Software, and to permit persons to whom the Software is
walter76 2:bbc3e860fa3d 9 * furnished to do so, subject to the following conditions:
walter76 2:bbc3e860fa3d 10 *
walter76 2:bbc3e860fa3d 11 * The above copyright notice and this permission notice shall be included in
walter76 2:bbc3e860fa3d 12 * all copies or substantial portions of the Software.
walter76 2:bbc3e860fa3d 13 *
walter76 2:bbc3e860fa3d 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
walter76 2:bbc3e860fa3d 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
walter76 2:bbc3e860fa3d 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
walter76 2:bbc3e860fa3d 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
walter76 2:bbc3e860fa3d 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
walter76 2:bbc3e860fa3d 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
walter76 2:bbc3e860fa3d 20 * SOFTWARE.
walter76 2:bbc3e860fa3d 21 */
walter76 2:bbc3e860fa3d 22 /* Introduction
walter76 2:bbc3e860fa3d 23 * ------------
walter76 2:bbc3e860fa3d 24 * SD and MMC cards support a number of interfaces, but common to them all
walter76 2:bbc3e860fa3d 25 * is one based on SPI. This is the one I'm implmenting because it means
walter76 2:bbc3e860fa3d 26 * it is much more portable even though not so performant, and we already
walter76 2:bbc3e860fa3d 27 * have the mbed SPI Interface!
walter76 2:bbc3e860fa3d 28 *
walter76 2:bbc3e860fa3d 29 * The main reference I'm using is Chapter 7, "SPI Mode" of:
walter76 2:bbc3e860fa3d 30 * http://www.sdcard.org/developers/tech/sdcard/pls/Simplified_Physical_Layer_Spec.pdf
walter76 2:bbc3e860fa3d 31 *
walter76 2:bbc3e860fa3d 32 * SPI Startup
walter76 2:bbc3e860fa3d 33 * -----------
walter76 2:bbc3e860fa3d 34 * The SD card powers up in SD mode. The SPI interface mode is selected by
walter76 2:bbc3e860fa3d 35 * asserting CS low and sending the reset command (CMD0). The card will
walter76 2:bbc3e860fa3d 36 * respond with a (R1) response.
walter76 2:bbc3e860fa3d 37 *
walter76 2:bbc3e860fa3d 38 * CMD8 is optionally sent to determine the voltage range supported, and
walter76 2:bbc3e860fa3d 39 * indirectly determine whether it is a version 1.x SD/non-SD card or
walter76 2:bbc3e860fa3d 40 * version 2.x. I'll just ignore this for now.
walter76 2:bbc3e860fa3d 41 *
walter76 2:bbc3e860fa3d 42 * ACMD41 is repeatedly issued to initialise the card, until "in idle"
walter76 2:bbc3e860fa3d 43 * (bit 0) of the R1 response goes to '0', indicating it is initialised.
walter76 2:bbc3e860fa3d 44 *
walter76 2:bbc3e860fa3d 45 * You should also indicate whether the host supports High Capicity cards,
walter76 2:bbc3e860fa3d 46 * and check whether the card is high capacity - i'll also ignore this
walter76 2:bbc3e860fa3d 47 *
walter76 2:bbc3e860fa3d 48 * SPI Protocol
walter76 2:bbc3e860fa3d 49 * ------------
walter76 2:bbc3e860fa3d 50 * The SD SPI protocol is based on transactions made up of 8-bit words, with
walter76 2:bbc3e860fa3d 51 * the host starting every bus transaction by asserting the CS signal low. The
walter76 2:bbc3e860fa3d 52 * card always responds to commands, data blocks and errors.
walter76 2:bbc3e860fa3d 53 *
walter76 2:bbc3e860fa3d 54 * The protocol supports a CRC, but by default it is off (except for the
walter76 2:bbc3e860fa3d 55 * first reset CMD0, where the CRC can just be pre-calculated, and CMD8)
walter76 2:bbc3e860fa3d 56 * I'll leave the CRC off I think!
walter76 2:bbc3e860fa3d 57 *
walter76 2:bbc3e860fa3d 58 * Standard capacity cards have variable data block sizes, whereas High
walter76 2:bbc3e860fa3d 59 * Capacity cards fix the size of data block to 512 bytes. I'll therefore
walter76 2:bbc3e860fa3d 60 * just always use the Standard Capacity cards with a block size of 512 bytes.
walter76 2:bbc3e860fa3d 61 * This is set with CMD16.
walter76 2:bbc3e860fa3d 62 *
walter76 2:bbc3e860fa3d 63 * You can read and write single blocks (CMD17, CMD25) or multiple blocks
walter76 2:bbc3e860fa3d 64 * (CMD18, CMD25). For simplicity, I'll just use single block accesses. When
walter76 2:bbc3e860fa3d 65 * the card gets a read command, it responds with a response token, and then
walter76 2:bbc3e860fa3d 66 * a data token or an error.
walter76 2:bbc3e860fa3d 67 *
walter76 2:bbc3e860fa3d 68 * SPI Command Format
walter76 2:bbc3e860fa3d 69 * ------------------
walter76 2:bbc3e860fa3d 70 * Commands are 6-bytes long, containing the command, 32-bit argument, and CRC.
walter76 2:bbc3e860fa3d 71 *
walter76 2:bbc3e860fa3d 72 * +---------------+------------+------------+-----------+----------+--------------+
walter76 2:bbc3e860fa3d 73 * | 01 | cmd[5:0] | arg[31:24] | arg[23:16] | arg[15:8] | arg[7:0] | crc[6:0] | 1 |
walter76 2:bbc3e860fa3d 74 * +---------------+------------+------------+-----------+----------+--------------+
walter76 2:bbc3e860fa3d 75 *
walter76 2:bbc3e860fa3d 76 * As I'm not using CRC, I can fix that byte to what is needed for CMD0 (0x95)
walter76 2:bbc3e860fa3d 77 *
walter76 2:bbc3e860fa3d 78 * All Application Specific commands shall be preceded with APP_CMD (CMD55).
walter76 2:bbc3e860fa3d 79 *
walter76 2:bbc3e860fa3d 80 * SPI Response Format
walter76 2:bbc3e860fa3d 81 * -------------------
walter76 2:bbc3e860fa3d 82 * The main response format (R1) is a status byte (normally zero). Key flags:
walter76 2:bbc3e860fa3d 83 * idle - 1 if the card is in an idle state/initialising
walter76 2:bbc3e860fa3d 84 * cmd - 1 if an illegal command code was detected
walter76 2:bbc3e860fa3d 85 *
walter76 2:bbc3e860fa3d 86 * +-------------------------------------------------+
walter76 2:bbc3e860fa3d 87 * R1 | 0 | arg | addr | seq | crc | cmd | erase | idle |
walter76 2:bbc3e860fa3d 88 * +-------------------------------------------------+
walter76 2:bbc3e860fa3d 89 *
walter76 2:bbc3e860fa3d 90 * R1b is the same, except it is followed by a busy signal (zeros) until
walter76 2:bbc3e860fa3d 91 * the first non-zero byte when it is ready again.
walter76 2:bbc3e860fa3d 92 *
walter76 2:bbc3e860fa3d 93 * Data Response Token
walter76 2:bbc3e860fa3d 94 * -------------------
walter76 2:bbc3e860fa3d 95 * Every data block written to the card is acknowledged by a byte
walter76 2:bbc3e860fa3d 96 * response token
walter76 2:bbc3e860fa3d 97 *
walter76 2:bbc3e860fa3d 98 * +----------------------+
walter76 2:bbc3e860fa3d 99 * | xxx | 0 | status | 1 |
walter76 2:bbc3e860fa3d 100 * +----------------------+
walter76 2:bbc3e860fa3d 101 * 010 - OK!
walter76 2:bbc3e860fa3d 102 * 101 - CRC Error
walter76 2:bbc3e860fa3d 103 * 110 - Write Error
walter76 2:bbc3e860fa3d 104 *
walter76 2:bbc3e860fa3d 105 * Single Block Read and Write
walter76 2:bbc3e860fa3d 106 * ---------------------------
walter76 2:bbc3e860fa3d 107 *
walter76 2:bbc3e860fa3d 108 * Block transfers have a byte header, followed by the data, followed
walter76 2:bbc3e860fa3d 109 * by a 16-bit CRC. In our case, the data will always be 512 bytes.
walter76 2:bbc3e860fa3d 110 *
walter76 2:bbc3e860fa3d 111 * +------+---------+---------+- - - -+---------+-----------+----------+
walter76 2:bbc3e860fa3d 112 * | 0xFE | data[0] | data[1] | | data[n] | crc[15:8] | crc[7:0] |
walter76 2:bbc3e860fa3d 113 * +------+---------+---------+- - - -+---------+-----------+----------+
walter76 2:bbc3e860fa3d 114 */
walter76 2:bbc3e860fa3d 115 #include "SDFileSystem.h"
walter76 2:bbc3e860fa3d 116 #include "mbed_debug.h"
walter76 2:bbc3e860fa3d 117
walter76 2:bbc3e860fa3d 118 #define SD_COMMAND_TIMEOUT 5000
walter76 2:bbc3e860fa3d 119
walter76 2:bbc3e860fa3d 120 #define SD_DBG 0
walter76 2:bbc3e860fa3d 121
walter76 2:bbc3e860fa3d 122 SDFileSystem::SDFileSystem(PinName mosi, PinName miso, PinName sclk, PinName cs, const char* name) :
walter76 2:bbc3e860fa3d 123 FATFileSystem(name), _spi(mosi, miso, sclk), _cs(cs), _is_initialized(0) {
walter76 2:bbc3e860fa3d 124 _cs = 1;
walter76 2:bbc3e860fa3d 125
walter76 2:bbc3e860fa3d 126 // Set default to 100kHz for initialisation and 1MHz for data transfer
walter76 2:bbc3e860fa3d 127 _init_sck = 100000;
walter76 2:bbc3e860fa3d 128 _transfer_sck = 1000000;
walter76 2:bbc3e860fa3d 129 }
walter76 2:bbc3e860fa3d 130
walter76 2:bbc3e860fa3d 131 #define R1_IDLE_STATE (1 << 0)
walter76 2:bbc3e860fa3d 132 #define R1_ERASE_RESET (1 << 1)
walter76 2:bbc3e860fa3d 133 #define R1_ILLEGAL_COMMAND (1 << 2)
walter76 2:bbc3e860fa3d 134 #define R1_COM_CRC_ERROR (1 << 3)
walter76 2:bbc3e860fa3d 135 #define R1_ERASE_SEQUENCE_ERROR (1 << 4)
walter76 2:bbc3e860fa3d 136 #define R1_ADDRESS_ERROR (1 << 5)
walter76 2:bbc3e860fa3d 137 #define R1_PARAMETER_ERROR (1 << 6)
walter76 2:bbc3e860fa3d 138
walter76 2:bbc3e860fa3d 139 // Types
walter76 2:bbc3e860fa3d 140 // - v1.x Standard Capacity
walter76 2:bbc3e860fa3d 141 // - v2.x Standard Capacity
walter76 2:bbc3e860fa3d 142 // - v2.x High Capacity
walter76 2:bbc3e860fa3d 143 // - Not recognised as an SD Card
walter76 2:bbc3e860fa3d 144 #define SDCARD_FAIL 0
walter76 2:bbc3e860fa3d 145 #define SDCARD_V1 1
walter76 2:bbc3e860fa3d 146 #define SDCARD_V2 2
walter76 2:bbc3e860fa3d 147 #define SDCARD_V2HC 3
walter76 2:bbc3e860fa3d 148
walter76 2:bbc3e860fa3d 149 int SDFileSystem::initialise_card() {
walter76 2:bbc3e860fa3d 150 // Set to SCK for initialisation, and clock card with cs = 1
walter76 2:bbc3e860fa3d 151 _spi.frequency(_init_sck);
walter76 2:bbc3e860fa3d 152 _cs = 1;
walter76 2:bbc3e860fa3d 153 for (int i = 0; i < 16; i++) {
walter76 2:bbc3e860fa3d 154 _spi.write(0xFF);
walter76 2:bbc3e860fa3d 155 }
walter76 2:bbc3e860fa3d 156
walter76 2:bbc3e860fa3d 157 // send CMD0, should return with all zeros except IDLE STATE set (bit 0)
walter76 2:bbc3e860fa3d 158 if (_cmd(0, 0) != R1_IDLE_STATE) {
walter76 2:bbc3e860fa3d 159 debug("No disk, or could not put SD card in to SPI idle state\n");
walter76 2:bbc3e860fa3d 160 return SDCARD_FAIL;
walter76 2:bbc3e860fa3d 161 }
walter76 2:bbc3e860fa3d 162
walter76 2:bbc3e860fa3d 163 // send CMD8 to determine whther it is ver 2.x
walter76 2:bbc3e860fa3d 164 int r = _cmd8();
walter76 2:bbc3e860fa3d 165 if (r == R1_IDLE_STATE) {
walter76 2:bbc3e860fa3d 166 return initialise_card_v2();
walter76 2:bbc3e860fa3d 167 } else if (r == (R1_IDLE_STATE | R1_ILLEGAL_COMMAND)) {
walter76 2:bbc3e860fa3d 168 return initialise_card_v1();
walter76 2:bbc3e860fa3d 169 } else {
walter76 2:bbc3e860fa3d 170 debug("Not in idle state after sending CMD8 (not an SD card?)\n");
walter76 2:bbc3e860fa3d 171 return SDCARD_FAIL;
walter76 2:bbc3e860fa3d 172 }
walter76 2:bbc3e860fa3d 173 }
walter76 2:bbc3e860fa3d 174
walter76 2:bbc3e860fa3d 175 int SDFileSystem::initialise_card_v1() {
walter76 2:bbc3e860fa3d 176 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
walter76 2:bbc3e860fa3d 177 _cmd(55, 0);
walter76 2:bbc3e860fa3d 178 if (_cmd(41, 0) == 0) {
walter76 2:bbc3e860fa3d 179 cdv = 512;
walter76 2:bbc3e860fa3d 180 debug_if(SD_DBG, "\n\rInit: SEDCARD_V1\n\r");
walter76 2:bbc3e860fa3d 181 return SDCARD_V1;
walter76 2:bbc3e860fa3d 182 }
walter76 2:bbc3e860fa3d 183 }
walter76 2:bbc3e860fa3d 184
walter76 2:bbc3e860fa3d 185 debug("Timeout waiting for v1.x card\n");
walter76 2:bbc3e860fa3d 186 return SDCARD_FAIL;
walter76 2:bbc3e860fa3d 187 }
walter76 2:bbc3e860fa3d 188
walter76 2:bbc3e860fa3d 189 int SDFileSystem::initialise_card_v2() {
walter76 2:bbc3e860fa3d 190 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
walter76 2:bbc3e860fa3d 191 wait_ms(50);
walter76 2:bbc3e860fa3d 192 _cmd58();
walter76 2:bbc3e860fa3d 193 _cmd(55, 0);
walter76 2:bbc3e860fa3d 194 if (_cmd(41, 0x40000000) == 0) {
walter76 2:bbc3e860fa3d 195 _cmd58();
walter76 2:bbc3e860fa3d 196 debug_if(SD_DBG, "\n\rInit: SDCARD_V2\n\r");
walter76 2:bbc3e860fa3d 197 cdv = 1;
walter76 2:bbc3e860fa3d 198 return SDCARD_V2;
walter76 2:bbc3e860fa3d 199 }
walter76 2:bbc3e860fa3d 200 }
walter76 2:bbc3e860fa3d 201
walter76 2:bbc3e860fa3d 202 debug("Timeout waiting for v2.x card\n");
walter76 2:bbc3e860fa3d 203 return SDCARD_FAIL;
walter76 2:bbc3e860fa3d 204 }
walter76 2:bbc3e860fa3d 205
walter76 2:bbc3e860fa3d 206 int SDFileSystem::disk_initialize() {
walter76 2:bbc3e860fa3d 207 _is_initialized = initialise_card();
walter76 2:bbc3e860fa3d 208 if (_is_initialized == 0) {
walter76 2:bbc3e860fa3d 209 debug("Fail to initialize card\n");
walter76 2:bbc3e860fa3d 210 return 1;
walter76 2:bbc3e860fa3d 211 }
walter76 2:bbc3e860fa3d 212 debug_if(SD_DBG, "init card = %d\n", _is_initialized);
walter76 2:bbc3e860fa3d 213 _sectors = _sd_sectors();
walter76 2:bbc3e860fa3d 214
walter76 2:bbc3e860fa3d 215 // Set block length to 512 (CMD16)
walter76 2:bbc3e860fa3d 216 if (_cmd(16, 512) != 0) {
walter76 2:bbc3e860fa3d 217 debug("Set 512-byte block timed out\n");
walter76 2:bbc3e860fa3d 218 return 1;
walter76 2:bbc3e860fa3d 219 }
walter76 2:bbc3e860fa3d 220
walter76 2:bbc3e860fa3d 221 // Set SCK for data transfer
walter76 2:bbc3e860fa3d 222 _spi.frequency(_transfer_sck);
walter76 2:bbc3e860fa3d 223 return 0;
walter76 2:bbc3e860fa3d 224 }
walter76 2:bbc3e860fa3d 225
walter76 2:bbc3e860fa3d 226 int SDFileSystem::disk_write(const uint8_t* buffer, uint32_t block_number, uint32_t count) {
walter76 2:bbc3e860fa3d 227 if (!_is_initialized) {
walter76 2:bbc3e860fa3d 228 return -1;
walter76 2:bbc3e860fa3d 229 }
walter76 2:bbc3e860fa3d 230
walter76 2:bbc3e860fa3d 231 for (uint32_t b = block_number; b < block_number + count; b++) {
walter76 2:bbc3e860fa3d 232 // set write address for single block (CMD24)
walter76 2:bbc3e860fa3d 233 if (_cmd(24, b * cdv) != 0) {
walter76 2:bbc3e860fa3d 234 return 1;
walter76 2:bbc3e860fa3d 235 }
walter76 2:bbc3e860fa3d 236
walter76 2:bbc3e860fa3d 237 // send the data block
walter76 2:bbc3e860fa3d 238 _write(buffer, 512);
walter76 2:bbc3e860fa3d 239 buffer += 512;
walter76 2:bbc3e860fa3d 240 }
walter76 2:bbc3e860fa3d 241
walter76 2:bbc3e860fa3d 242 return 0;
walter76 2:bbc3e860fa3d 243 }
walter76 2:bbc3e860fa3d 244
walter76 2:bbc3e860fa3d 245 int SDFileSystem::disk_read(uint8_t* buffer, uint32_t block_number, uint32_t count) {
walter76 2:bbc3e860fa3d 246 if (!_is_initialized) {
walter76 2:bbc3e860fa3d 247 return -1;
walter76 2:bbc3e860fa3d 248 }
walter76 2:bbc3e860fa3d 249
walter76 2:bbc3e860fa3d 250 for (uint32_t b = block_number; b < block_number + count; b++) {
walter76 2:bbc3e860fa3d 251 // set read address for single block (CMD17)
walter76 2:bbc3e860fa3d 252 if (_cmd(17, b * cdv) != 0) {
walter76 2:bbc3e860fa3d 253 return 1;
walter76 2:bbc3e860fa3d 254 }
walter76 2:bbc3e860fa3d 255
walter76 2:bbc3e860fa3d 256 // receive the data
walter76 2:bbc3e860fa3d 257 _read(buffer, 512);
walter76 2:bbc3e860fa3d 258 buffer += 512;
walter76 2:bbc3e860fa3d 259 }
walter76 2:bbc3e860fa3d 260
walter76 2:bbc3e860fa3d 261 return 0;
walter76 2:bbc3e860fa3d 262 }
walter76 2:bbc3e860fa3d 263
walter76 2:bbc3e860fa3d 264 int SDFileSystem::disk_status() {
walter76 2:bbc3e860fa3d 265 // FATFileSystem::disk_status() returns 0 when initialized
walter76 2:bbc3e860fa3d 266 if (_is_initialized) {
walter76 2:bbc3e860fa3d 267 return 0;
walter76 2:bbc3e860fa3d 268 } else {
walter76 2:bbc3e860fa3d 269 return 1;
walter76 2:bbc3e860fa3d 270 }
walter76 2:bbc3e860fa3d 271 }
walter76 2:bbc3e860fa3d 272
walter76 2:bbc3e860fa3d 273 int SDFileSystem::disk_sync() { return 0; }
walter76 2:bbc3e860fa3d 274 uint32_t SDFileSystem::disk_sectors() { return _sectors; }
walter76 2:bbc3e860fa3d 275
walter76 2:bbc3e860fa3d 276
walter76 2:bbc3e860fa3d 277 // PRIVATE FUNCTIONS
walter76 2:bbc3e860fa3d 278 int SDFileSystem::_cmd(int cmd, int arg) {
walter76 2:bbc3e860fa3d 279 _cs = 0;
walter76 2:bbc3e860fa3d 280
walter76 2:bbc3e860fa3d 281 // send a command
walter76 2:bbc3e860fa3d 282 _spi.write(0x40 | cmd);
walter76 2:bbc3e860fa3d 283 _spi.write(arg >> 24);
walter76 2:bbc3e860fa3d 284 _spi.write(arg >> 16);
walter76 2:bbc3e860fa3d 285 _spi.write(arg >> 8);
walter76 2:bbc3e860fa3d 286 _spi.write(arg >> 0);
walter76 2:bbc3e860fa3d 287 _spi.write(0x95);
walter76 2:bbc3e860fa3d 288
walter76 2:bbc3e860fa3d 289 // wait for the repsonse (response[7] == 0)
walter76 2:bbc3e860fa3d 290 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
walter76 2:bbc3e860fa3d 291 int response = _spi.write(0xFF);
walter76 2:bbc3e860fa3d 292 if (!(response & 0x80)) {
walter76 2:bbc3e860fa3d 293 _cs = 1;
walter76 2:bbc3e860fa3d 294 _spi.write(0xFF);
walter76 2:bbc3e860fa3d 295 return response;
walter76 2:bbc3e860fa3d 296 }
walter76 2:bbc3e860fa3d 297 }
walter76 2:bbc3e860fa3d 298 _cs = 1;
walter76 2:bbc3e860fa3d 299 _spi.write(0xFF);
walter76 2:bbc3e860fa3d 300 return -1; // timeout
walter76 2:bbc3e860fa3d 301 }
walter76 2:bbc3e860fa3d 302 int SDFileSystem::_cmdx(int cmd, int arg) {
walter76 2:bbc3e860fa3d 303 _cs = 0;
walter76 2:bbc3e860fa3d 304
walter76 2:bbc3e860fa3d 305 // send a command
walter76 2:bbc3e860fa3d 306 _spi.write(0x40 | cmd);
walter76 2:bbc3e860fa3d 307 _spi.write(arg >> 24);
walter76 2:bbc3e860fa3d 308 _spi.write(arg >> 16);
walter76 2:bbc3e860fa3d 309 _spi.write(arg >> 8);
walter76 2:bbc3e860fa3d 310 _spi.write(arg >> 0);
walter76 2:bbc3e860fa3d 311 _spi.write(0x95);
walter76 2:bbc3e860fa3d 312
walter76 2:bbc3e860fa3d 313 // wait for the repsonse (response[7] == 0)
walter76 2:bbc3e860fa3d 314 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
walter76 2:bbc3e860fa3d 315 int response = _spi.write(0xFF);
walter76 2:bbc3e860fa3d 316 if (!(response & 0x80)) {
walter76 2:bbc3e860fa3d 317 return response;
walter76 2:bbc3e860fa3d 318 }
walter76 2:bbc3e860fa3d 319 }
walter76 2:bbc3e860fa3d 320 _cs = 1;
walter76 2:bbc3e860fa3d 321 _spi.write(0xFF);
walter76 2:bbc3e860fa3d 322 return -1; // timeout
walter76 2:bbc3e860fa3d 323 }
walter76 2:bbc3e860fa3d 324
walter76 2:bbc3e860fa3d 325
walter76 2:bbc3e860fa3d 326 int SDFileSystem::_cmd58() {
walter76 2:bbc3e860fa3d 327 _cs = 0;
walter76 2:bbc3e860fa3d 328 int arg = 0;
walter76 2:bbc3e860fa3d 329
walter76 2:bbc3e860fa3d 330 // send a command
walter76 2:bbc3e860fa3d 331 _spi.write(0x40 | 58);
walter76 2:bbc3e860fa3d 332 _spi.write(arg >> 24);
walter76 2:bbc3e860fa3d 333 _spi.write(arg >> 16);
walter76 2:bbc3e860fa3d 334 _spi.write(arg >> 8);
walter76 2:bbc3e860fa3d 335 _spi.write(arg >> 0);
walter76 2:bbc3e860fa3d 336 _spi.write(0x95);
walter76 2:bbc3e860fa3d 337
walter76 2:bbc3e860fa3d 338 // wait for the repsonse (response[7] == 0)
walter76 2:bbc3e860fa3d 339 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
walter76 2:bbc3e860fa3d 340 int response = _spi.write(0xFF);
walter76 2:bbc3e860fa3d 341 if (!(response & 0x80)) {
walter76 2:bbc3e860fa3d 342 int ocr = _spi.write(0xFF) << 24;
walter76 2:bbc3e860fa3d 343 ocr |= _spi.write(0xFF) << 16;
walter76 2:bbc3e860fa3d 344 ocr |= _spi.write(0xFF) << 8;
walter76 2:bbc3e860fa3d 345 ocr |= _spi.write(0xFF) << 0;
walter76 2:bbc3e860fa3d 346 _cs = 1;
walter76 2:bbc3e860fa3d 347 _spi.write(0xFF);
walter76 2:bbc3e860fa3d 348 return response;
walter76 2:bbc3e860fa3d 349 }
walter76 2:bbc3e860fa3d 350 }
walter76 2:bbc3e860fa3d 351 _cs = 1;
walter76 2:bbc3e860fa3d 352 _spi.write(0xFF);
walter76 2:bbc3e860fa3d 353 return -1; // timeout
walter76 2:bbc3e860fa3d 354 }
walter76 2:bbc3e860fa3d 355
walter76 2:bbc3e860fa3d 356 int SDFileSystem::_cmd8() {
walter76 2:bbc3e860fa3d 357 _cs = 0;
walter76 2:bbc3e860fa3d 358
walter76 2:bbc3e860fa3d 359 // send a command
walter76 2:bbc3e860fa3d 360 _spi.write(0x40 | 8); // CMD8
walter76 2:bbc3e860fa3d 361 _spi.write(0x00); // reserved
walter76 2:bbc3e860fa3d 362 _spi.write(0x00); // reserved
walter76 2:bbc3e860fa3d 363 _spi.write(0x01); // 3.3v
walter76 2:bbc3e860fa3d 364 _spi.write(0xAA); // check pattern
walter76 2:bbc3e860fa3d 365 _spi.write(0x87); // crc
walter76 2:bbc3e860fa3d 366
walter76 2:bbc3e860fa3d 367 // wait for the repsonse (response[7] == 0)
walter76 2:bbc3e860fa3d 368 for (int i = 0; i < SD_COMMAND_TIMEOUT * 1000; i++) {
walter76 2:bbc3e860fa3d 369 char response[5];
walter76 2:bbc3e860fa3d 370 response[0] = _spi.write(0xFF);
walter76 2:bbc3e860fa3d 371 if (!(response[0] & 0x80)) {
walter76 2:bbc3e860fa3d 372 for (int j = 1; j < 5; j++) {
walter76 2:bbc3e860fa3d 373 response[i] = _spi.write(0xFF);
walter76 2:bbc3e860fa3d 374 }
walter76 2:bbc3e860fa3d 375 _cs = 1;
walter76 2:bbc3e860fa3d 376 _spi.write(0xFF);
walter76 2:bbc3e860fa3d 377 return response[0];
walter76 2:bbc3e860fa3d 378 }
walter76 2:bbc3e860fa3d 379 }
walter76 2:bbc3e860fa3d 380 _cs = 1;
walter76 2:bbc3e860fa3d 381 _spi.write(0xFF);
walter76 2:bbc3e860fa3d 382 return -1; // timeout
walter76 2:bbc3e860fa3d 383 }
walter76 2:bbc3e860fa3d 384
walter76 2:bbc3e860fa3d 385 int SDFileSystem::_read(uint8_t *buffer, uint32_t length) {
walter76 2:bbc3e860fa3d 386 _cs = 0;
walter76 2:bbc3e860fa3d 387
walter76 2:bbc3e860fa3d 388 // read until start byte (0xFF)
walter76 2:bbc3e860fa3d 389 while (_spi.write(0xFF) != 0xFE);
walter76 2:bbc3e860fa3d 390
walter76 2:bbc3e860fa3d 391 // read data
walter76 2:bbc3e860fa3d 392 for (uint32_t i = 0; i < length; i++) {
walter76 2:bbc3e860fa3d 393 buffer[i] = _spi.write(0xFF);
walter76 2:bbc3e860fa3d 394 }
walter76 2:bbc3e860fa3d 395 _spi.write(0xFF); // checksum
walter76 2:bbc3e860fa3d 396 _spi.write(0xFF);
walter76 2:bbc3e860fa3d 397
walter76 2:bbc3e860fa3d 398 _cs = 1;
walter76 2:bbc3e860fa3d 399 _spi.write(0xFF);
walter76 2:bbc3e860fa3d 400 return 0;
walter76 2:bbc3e860fa3d 401 }
walter76 2:bbc3e860fa3d 402
walter76 2:bbc3e860fa3d 403 int SDFileSystem::_write(const uint8_t*buffer, uint32_t length) {
walter76 2:bbc3e860fa3d 404 _cs = 0;
walter76 2:bbc3e860fa3d 405
walter76 2:bbc3e860fa3d 406 // indicate start of block
walter76 2:bbc3e860fa3d 407 _spi.write(0xFE);
walter76 2:bbc3e860fa3d 408
walter76 2:bbc3e860fa3d 409 // write the data
walter76 2:bbc3e860fa3d 410 for (uint32_t i = 0; i < length; i++) {
walter76 2:bbc3e860fa3d 411 _spi.write(buffer[i]);
walter76 2:bbc3e860fa3d 412 }
walter76 2:bbc3e860fa3d 413
walter76 2:bbc3e860fa3d 414 // write the checksum
walter76 2:bbc3e860fa3d 415 _spi.write(0xFF);
walter76 2:bbc3e860fa3d 416 _spi.write(0xFF);
walter76 2:bbc3e860fa3d 417
walter76 2:bbc3e860fa3d 418 // check the response token
walter76 2:bbc3e860fa3d 419 if ((_spi.write(0xFF) & 0x1F) != 0x05) {
walter76 2:bbc3e860fa3d 420 _cs = 1;
walter76 2:bbc3e860fa3d 421 _spi.write(0xFF);
walter76 2:bbc3e860fa3d 422 return 1;
walter76 2:bbc3e860fa3d 423 }
walter76 2:bbc3e860fa3d 424
walter76 2:bbc3e860fa3d 425 // wait for write to finish
walter76 2:bbc3e860fa3d 426 while (_spi.write(0xFF) == 0);
walter76 2:bbc3e860fa3d 427
walter76 2:bbc3e860fa3d 428 _cs = 1;
walter76 2:bbc3e860fa3d 429 _spi.write(0xFF);
walter76 2:bbc3e860fa3d 430 return 0;
walter76 2:bbc3e860fa3d 431 }
walter76 2:bbc3e860fa3d 432
walter76 2:bbc3e860fa3d 433 static uint32_t ext_bits(unsigned char *data, int msb, int lsb) {
walter76 2:bbc3e860fa3d 434 uint32_t bits = 0;
walter76 2:bbc3e860fa3d 435 uint32_t size = 1 + msb - lsb;
walter76 2:bbc3e860fa3d 436 for (uint32_t i = 0; i < size; i++) {
walter76 2:bbc3e860fa3d 437 uint32_t position = lsb + i;
walter76 2:bbc3e860fa3d 438 uint32_t byte = 15 - (position >> 3);
walter76 2:bbc3e860fa3d 439 uint32_t bit = position & 0x7;
walter76 2:bbc3e860fa3d 440 uint32_t value = (data[byte] >> bit) & 1;
walter76 2:bbc3e860fa3d 441 bits |= value << i;
walter76 2:bbc3e860fa3d 442 }
walter76 2:bbc3e860fa3d 443 return bits;
walter76 2:bbc3e860fa3d 444 }
walter76 2:bbc3e860fa3d 445
walter76 2:bbc3e860fa3d 446 uint32_t SDFileSystem::_sd_sectors() {
walter76 2:bbc3e860fa3d 447 uint32_t c_size, c_size_mult, read_bl_len;
walter76 2:bbc3e860fa3d 448 uint32_t block_len, mult, blocknr, capacity;
walter76 2:bbc3e860fa3d 449 uint32_t hc_c_size;
walter76 2:bbc3e860fa3d 450 uint32_t blocks;
walter76 2:bbc3e860fa3d 451
walter76 2:bbc3e860fa3d 452 // CMD9, Response R2 (R1 byte + 16-byte block read)
walter76 2:bbc3e860fa3d 453 if (_cmdx(9, 0) != 0) {
walter76 2:bbc3e860fa3d 454 debug("Didn't get a response from the disk\n");
walter76 2:bbc3e860fa3d 455 return 0;
walter76 2:bbc3e860fa3d 456 }
walter76 2:bbc3e860fa3d 457
walter76 2:bbc3e860fa3d 458 uint8_t csd[16];
walter76 2:bbc3e860fa3d 459 if (_read(csd, 16) != 0) {
walter76 2:bbc3e860fa3d 460 debug("Couldn't read csd response from disk\n");
walter76 2:bbc3e860fa3d 461 return 0;
walter76 2:bbc3e860fa3d 462 }
walter76 2:bbc3e860fa3d 463
walter76 2:bbc3e860fa3d 464 // csd_structure : csd[127:126]
walter76 2:bbc3e860fa3d 465 // c_size : csd[73:62]
walter76 2:bbc3e860fa3d 466 // c_size_mult : csd[49:47]
walter76 2:bbc3e860fa3d 467 // read_bl_len : csd[83:80] - the *maximum* read block length
walter76 2:bbc3e860fa3d 468
walter76 2:bbc3e860fa3d 469 int csd_structure = ext_bits(csd, 127, 126);
walter76 2:bbc3e860fa3d 470
walter76 2:bbc3e860fa3d 471 switch (csd_structure) {
walter76 2:bbc3e860fa3d 472 case 0:
walter76 2:bbc3e860fa3d 473 cdv = 512;
walter76 2:bbc3e860fa3d 474 c_size = ext_bits(csd, 73, 62);
walter76 2:bbc3e860fa3d 475 c_size_mult = ext_bits(csd, 49, 47);
walter76 2:bbc3e860fa3d 476 read_bl_len = ext_bits(csd, 83, 80);
walter76 2:bbc3e860fa3d 477
walter76 2:bbc3e860fa3d 478 block_len = 1 << read_bl_len;
walter76 2:bbc3e860fa3d 479 mult = 1 << (c_size_mult + 2);
walter76 2:bbc3e860fa3d 480 blocknr = (c_size + 1) * mult;
walter76 2:bbc3e860fa3d 481 capacity = blocknr * block_len;
walter76 2:bbc3e860fa3d 482 blocks = capacity / 512;
walter76 2:bbc3e860fa3d 483 debug_if(SD_DBG, "\n\rSDCard\n\rc_size: %d \n\rcapacity: %ld \n\rsectors: %lld\n\r", c_size, capacity, blocks);
walter76 2:bbc3e860fa3d 484 break;
walter76 2:bbc3e860fa3d 485
walter76 2:bbc3e860fa3d 486 case 1:
walter76 2:bbc3e860fa3d 487 cdv = 1;
walter76 2:bbc3e860fa3d 488 hc_c_size = ext_bits(csd, 63, 48);
walter76 2:bbc3e860fa3d 489 blocks = (hc_c_size+1)*1024;
walter76 2:bbc3e860fa3d 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);
walter76 2:bbc3e860fa3d 491 break;
walter76 2:bbc3e860fa3d 492
walter76 2:bbc3e860fa3d 493 default:
walter76 2:bbc3e860fa3d 494 debug("CSD struct unsupported\r\n");
walter76 2:bbc3e860fa3d 495 return 0;
walter76 2:bbc3e860fa3d 496 };
walter76 2:bbc3e860fa3d 497 return blocks;
walter76 2:bbc3e860fa3d 498 }