天宏 小原 / Mbed 2 deprecated main_SPC

private

Dependencies:   ADXL345 FATFileSystem LPS331_SPI mbed

SDFileSystem.cpp@2:6c4273f2f7ed, 2017-09-16 (annotated)

Committer:
obaratakahiro
Date:
Sat Sep 16 05:24:37 2017 +0000
Revision:
2:6c4273f2f7ed
Parent:
0:e9f20ea63046 
private

Who changed what in which revision?

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obaratakahiro 0:e9f20ea63046 1 /* mbed Microcontroller Library
obaratakahiro 0:e9f20ea63046 2 * Copyright (c) 2006-2012 ARM Limited
obaratakahiro 0:e9f20ea63046 3 *
obaratakahiro 0:e9f20ea63046 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
obaratakahiro 0:e9f20ea63046 5 * of this software and associated documentation files (the "Software"), to deal
obaratakahiro 0:e9f20ea63046 6 * in the Software without restriction, including without limitation the rights
obaratakahiro 0:e9f20ea63046 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
obaratakahiro 0:e9f20ea63046 8 * copies of the Software, and to permit persons to whom the Software is
obaratakahiro 0:e9f20ea63046 9 * furnished to do so, subject to the following conditions:
obaratakahiro 0:e9f20ea63046 10 *
obaratakahiro 0:e9f20ea63046 11 * The above copyright notice and this permission notice shall be included in
obaratakahiro 0:e9f20ea63046 12 * all copies or substantial portions of the Software.
obaratakahiro 0:e9f20ea63046 13 *
obaratakahiro 0:e9f20ea63046 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
obaratakahiro 0:e9f20ea63046 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
obaratakahiro 0:e9f20ea63046 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
obaratakahiro 0:e9f20ea63046 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
obaratakahiro 0:e9f20ea63046 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
obaratakahiro 0:e9f20ea63046 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
obaratakahiro 0:e9f20ea63046 20 * SOFTWARE.
obaratakahiro 0:e9f20ea63046 21 */
obaratakahiro 0:e9f20ea63046 22 /* Introduction
obaratakahiro 0:e9f20ea63046 23 * ------------
obaratakahiro 0:e9f20ea63046 24 * SD and MMC cards support a number of interfaces, but common to them all
obaratakahiro 0:e9f20ea63046 25 * is one based on SPI. This is the one I'm implmenting because it means
obaratakahiro 0:e9f20ea63046 26 * it is much more portable even though not so performant, and we already
obaratakahiro 0:e9f20ea63046 27 * have the mbed SPI Interface!
obaratakahiro 0:e9f20ea63046 28 *
obaratakahiro 0:e9f20ea63046 29 * The main reference I'm using is Chapter 7, "SPI Mode" of:
obaratakahiro 0:e9f20ea63046 30 * http://www.sdcard.org/developers/tech/sdcard/pls/Simplified_Physical_Layer_Spec.pdf
obaratakahiro 0:e9f20ea63046 31 *
obaratakahiro 0:e9f20ea63046 32 * SPI Startup
obaratakahiro 0:e9f20ea63046 33 * -----------
obaratakahiro 0:e9f20ea63046 34 * The SD card powers up in SD mode. The SPI interface mode is selected by
obaratakahiro 0:e9f20ea63046 35 * asserting CS low and sending the reset command (CMD0). The card will
obaratakahiro 0:e9f20ea63046 36 * respond with a (R1) response.
obaratakahiro 0:e9f20ea63046 37 *
obaratakahiro 0:e9f20ea63046 38 * CMD8 is optionally sent to determine the voltage range supported, and
obaratakahiro 0:e9f20ea63046 39 * indirectly determine whether it is a version 1.x SD/non-SD card or
obaratakahiro 0:e9f20ea63046 40 * version 2.x. I'll just ignore this for now.
obaratakahiro 0:e9f20ea63046 41 *
obaratakahiro 0:e9f20ea63046 42 * ACMD41 is repeatedly issued to initialise the card, until "in idle"
obaratakahiro 0:e9f20ea63046 43 * (bit 0) of the R1 response goes to '0', indicating it is initialised.
obaratakahiro 0:e9f20ea63046 44 *
obaratakahiro 0:e9f20ea63046 45 * You should also indicate whether the host supports High Capicity cards,
obaratakahiro 0:e9f20ea63046 46 * and check whether the card is high capacity - i'll also ignore this
obaratakahiro 0:e9f20ea63046 47 *
obaratakahiro 0:e9f20ea63046 48 * SPI Protocol
obaratakahiro 0:e9f20ea63046 49 * ------------
obaratakahiro 0:e9f20ea63046 50 * The SD SPI protocol is based on transactions made up of 8-bit words, with
obaratakahiro 0:e9f20ea63046 51 * the host starting every bus transaction by asserting the CS signal low. The
obaratakahiro 0:e9f20ea63046 52 * card always responds to commands, data blocks and errors.
obaratakahiro 0:e9f20ea63046 53 *
obaratakahiro 0:e9f20ea63046 54 * The protocol supports a CRC, but by default it is off (except for the
obaratakahiro 0:e9f20ea63046 55 * first reset CMD0, where the CRC can just be pre-calculated, and CMD8)
obaratakahiro 0:e9f20ea63046 56 * I'll leave the CRC off I think!
obaratakahiro 0:e9f20ea63046 57 *
obaratakahiro 0:e9f20ea63046 58 * Standard capacity cards have variable data block sizes, whereas High
obaratakahiro 0:e9f20ea63046 59 * Capacity cards fix the size of data block to 512 bytes. I'll therefore
obaratakahiro 0:e9f20ea63046 60 * just always use the Standard Capacity cards with a block size of 512 bytes.
obaratakahiro 0:e9f20ea63046 61 * This is set with CMD16.
obaratakahiro 0:e9f20ea63046 62 *
obaratakahiro 0:e9f20ea63046 63 * You can read and write single blocks (CMD17, CMD25) or multiple blocks
obaratakahiro 0:e9f20ea63046 64 * (CMD18, CMD25). For simplicity, I'll just use single block accesses. When
obaratakahiro 0:e9f20ea63046 65 * the card gets a read command, it responds with a response token, and then
obaratakahiro 0:e9f20ea63046 66 * a data token or an error.
obaratakahiro 0:e9f20ea63046 67 *
obaratakahiro 0:e9f20ea63046 68 * SPI Command Format
obaratakahiro 0:e9f20ea63046 69 * ------------------
obaratakahiro 0:e9f20ea63046 70 * Commands are 6-bytes long, containing the command, 32-bit argument, and CRC.
obaratakahiro 0:e9f20ea63046 71 *
obaratakahiro 0:e9f20ea63046 72 * +---------------+------------+------------+-----------+----------+--------------+
obaratakahiro 0:e9f20ea63046 73 * | 01 | cmd[5:0] | arg[31:24] | arg[23:16] | arg[15:8] | arg[7:0] | crc[6:0] | 1 |
obaratakahiro 0:e9f20ea63046 74 * +---------------+------------+------------+-----------+----------+--------------+
obaratakahiro 0:e9f20ea63046 75 *
obaratakahiro 0:e9f20ea63046 76 * As I'm not using CRC, I can fix that byte to what is needed for CMD0 (0x95)
obaratakahiro 0:e9f20ea63046 77 *
obaratakahiro 0:e9f20ea63046 78 * All Application Specific commands shall be preceded with APP_CMD (CMD55).
obaratakahiro 0:e9f20ea63046 79 *
obaratakahiro 0:e9f20ea63046 80 * SPI Response Format
obaratakahiro 0:e9f20ea63046 81 * -------------------
obaratakahiro 0:e9f20ea63046 82 * The main response format (R1) is a status byte (normally zero). Key flags:
obaratakahiro 0:e9f20ea63046 83 * idle - 1 if the card is in an idle state/initialising
obaratakahiro 0:e9f20ea63046 84 * cmd - 1 if an illegal command code was detected
obaratakahiro 0:e9f20ea63046 85 *
obaratakahiro 0:e9f20ea63046 86 * +-------------------------------------------------+
obaratakahiro 0:e9f20ea63046 87 * R1 | 0 | arg | addr | seq | crc | cmd | erase | idle |
obaratakahiro 0:e9f20ea63046 88 * +-------------------------------------------------+
obaratakahiro 0:e9f20ea63046 89 *
obaratakahiro 0:e9f20ea63046 90 * R1b is the same, except it is followed by a busy signal (zeros) until
obaratakahiro 0:e9f20ea63046 91 * the first non-zero byte when it is ready again.
obaratakahiro 0:e9f20ea63046 92 *
obaratakahiro 0:e9f20ea63046 93 * Data Response Token
obaratakahiro 0:e9f20ea63046 94 * -------------------
obaratakahiro 0:e9f20ea63046 95 * Every data block written to the card is acknowledged by a byte
obaratakahiro 0:e9f20ea63046 96 * response token
obaratakahiro 0:e9f20ea63046 97 *
obaratakahiro 0:e9f20ea63046 98 * +----------------------+
obaratakahiro 0:e9f20ea63046 99 * | xxx | 0 | status | 1 |
obaratakahiro 0:e9f20ea63046 100 * +----------------------+
obaratakahiro 0:e9f20ea63046 101 * 010 - OK!
obaratakahiro 0:e9f20ea63046 102 * 101 - CRC Error
obaratakahiro 0:e9f20ea63046 103 * 110 - Write Error
obaratakahiro 0:e9f20ea63046 104 *
obaratakahiro 0:e9f20ea63046 105 * Single Block Read and Write
obaratakahiro 0:e9f20ea63046 106 * ---------------------------
obaratakahiro 0:e9f20ea63046 107 *
obaratakahiro 0:e9f20ea63046 108 * Block transfers have a byte header, followed by the data, followed
obaratakahiro 0:e9f20ea63046 109 * by a 16-bit CRC. In our case, the data will always be 512 bytes.
obaratakahiro 0:e9f20ea63046 110 *
obaratakahiro 0:e9f20ea63046 111 * +------+---------+---------+- - - -+---------+-----------+----------+
obaratakahiro 0:e9f20ea63046 112 * | 0xFE | data[0] | data[1] | | data[n] | crc[15:8] | crc[7:0] |
obaratakahiro 0:e9f20ea63046 113 * +------+---------+---------+- - - -+---------+-----------+----------+
obaratakahiro 0:e9f20ea63046 114 */
obaratakahiro 0:e9f20ea63046 115 #include "SDFileSystem.h"
obaratakahiro 0:e9f20ea63046 116 #include "mbed_debug.h"
obaratakahiro 0:e9f20ea63046 117
obaratakahiro 0:e9f20ea63046 118 #define SD_COMMAND_TIMEOUT 5000
obaratakahiro 0:e9f20ea63046 119
obaratakahiro 0:e9f20ea63046 120 #define SD_DBG 0
obaratakahiro 0:e9f20ea63046 121
obaratakahiro 0:e9f20ea63046 122 SDFileSystem::SDFileSystem(PinName mosi, PinName miso, PinName sclk, PinName cs, const char* name) :
obaratakahiro 0:e9f20ea63046 123 FATFileSystem(name), _spi(mosi, miso, sclk), _cs(cs), _is_initialized(0) {
obaratakahiro 0:e9f20ea63046 124 _cs = 1;
obaratakahiro 0:e9f20ea63046 125
obaratakahiro 0:e9f20ea63046 126 // Set default to 100kHz for initialisation and 1MHz for data transfer
obaratakahiro 0:e9f20ea63046 127 _init_sck = 100000;
obaratakahiro 0:e9f20ea63046 128 _transfer_sck = 1000000;
obaratakahiro 0:e9f20ea63046 129 }
obaratakahiro 0:e9f20ea63046 130
obaratakahiro 0:e9f20ea63046 131 #define R1_IDLE_STATE (1 << 0)
obaratakahiro 0:e9f20ea63046 132 #define R1_ERASE_RESET (1 << 1)
obaratakahiro 0:e9f20ea63046 133 #define R1_ILLEGAL_COMMAND (1 << 2)
obaratakahiro 0:e9f20ea63046 134 #define R1_COM_CRC_ERROR (1 << 3)
obaratakahiro 0:e9f20ea63046 135 #define R1_ERASE_SEQUENCE_ERROR (1 << 4)
obaratakahiro 0:e9f20ea63046 136 #define R1_ADDRESS_ERROR (1 << 5)
obaratakahiro 0:e9f20ea63046 137 #define R1_PARAMETER_ERROR (1 << 6)
obaratakahiro 0:e9f20ea63046 138
obaratakahiro 0:e9f20ea63046 139 // Types
obaratakahiro 0:e9f20ea63046 140 // - v1.x Standard Capacity
obaratakahiro 0:e9f20ea63046 141 // - v2.x Standard Capacity
obaratakahiro 0:e9f20ea63046 142 // - v2.x High Capacity
obaratakahiro 0:e9f20ea63046 143 // - Not recognised as an SD Card
obaratakahiro 0:e9f20ea63046 144 #define SDCARD_FAIL 0
obaratakahiro 0:e9f20ea63046 145 #define SDCARD_V1 1
obaratakahiro 0:e9f20ea63046 146 #define SDCARD_V2 2
obaratakahiro 0:e9f20ea63046 147 #define SDCARD_V2HC 3
obaratakahiro 0:e9f20ea63046 148
obaratakahiro 0:e9f20ea63046 149 int SDFileSystem::initialise_card() {
obaratakahiro 0:e9f20ea63046 150 // Set to SCK for initialisation, and clock card with cs = 1
obaratakahiro 0:e9f20ea63046 151 _spi.frequency(_init_sck);
obaratakahiro 0:e9f20ea63046 152 _cs = 1;
obaratakahiro 0:e9f20ea63046 153 for (int i = 0; i < 16; i++) {
obaratakahiro 0:e9f20ea63046 154 _spi.write(0xFF);
obaratakahiro 0:e9f20ea63046 155 }
obaratakahiro 0:e9f20ea63046 156
obaratakahiro 0:e9f20ea63046 157 // send CMD0, should return with all zeros except IDLE STATE set (bit 0)
obaratakahiro 0:e9f20ea63046 158 if (_cmd(0, 0) != R1_IDLE_STATE) {
obaratakahiro 0:e9f20ea63046 159 debug("No disk, or could not put SD card in to SPI idle state\n");
obaratakahiro 0:e9f20ea63046 160 return SDCARD_FAIL;
obaratakahiro 0:e9f20ea63046 161 }
obaratakahiro 0:e9f20ea63046 162
obaratakahiro 0:e9f20ea63046 163 // send CMD8 to determine whther it is ver 2.x
obaratakahiro 0:e9f20ea63046 164 int r = _cmd8();
obaratakahiro 0:e9f20ea63046 165 if (r == R1_IDLE_STATE) {
obaratakahiro 0:e9f20ea63046 166 return initialise_card_v2();
obaratakahiro 0:e9f20ea63046 167 } else if (r == (R1_IDLE_STATE | R1_ILLEGAL_COMMAND)) {
obaratakahiro 0:e9f20ea63046 168 return initialise_card_v1();
obaratakahiro 0:e9f20ea63046 169 } else {
obaratakahiro 0:e9f20ea63046 170 debug("Not in idle state after sending CMD8 (not an SD card?)\n");
obaratakahiro 0:e9f20ea63046 171 return SDCARD_FAIL;
obaratakahiro 0:e9f20ea63046 172 }
obaratakahiro 0:e9f20ea63046 173 }
obaratakahiro 0:e9f20ea63046 174
obaratakahiro 0:e9f20ea63046 175 int SDFileSystem::initialise_card_v1() {
obaratakahiro 0:e9f20ea63046 176 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
obaratakahiro 0:e9f20ea63046 177 _cmd(55, 0);
obaratakahiro 0:e9f20ea63046 178 if (_cmd(41, 0) == 0) {
obaratakahiro 0:e9f20ea63046 179 cdv = 512;
obaratakahiro 0:e9f20ea63046 180 debug_if(SD_DBG, "\n\rInit: SEDCARD_V1\n\r");
obaratakahiro 0:e9f20ea63046 181 return SDCARD_V1;
obaratakahiro 0:e9f20ea63046 182 }
obaratakahiro 0:e9f20ea63046 183 }
obaratakahiro 0:e9f20ea63046 184
obaratakahiro 0:e9f20ea63046 185 debug("Timeout waiting for v1.x card\n");
obaratakahiro 0:e9f20ea63046 186 return SDCARD_FAIL;
obaratakahiro 0:e9f20ea63046 187 }
obaratakahiro 0:e9f20ea63046 188
obaratakahiro 0:e9f20ea63046 189 int SDFileSystem::initialise_card_v2() {
obaratakahiro 0:e9f20ea63046 190 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
obaratakahiro 0:e9f20ea63046 191 wait_ms(50);
obaratakahiro 0:e9f20ea63046 192 _cmd58();
obaratakahiro 0:e9f20ea63046 193 _cmd(55, 0);
obaratakahiro 0:e9f20ea63046 194 if (_cmd(41, 0x40000000) == 0) {
obaratakahiro 0:e9f20ea63046 195 _cmd58();
obaratakahiro 0:e9f20ea63046 196 debug_if(SD_DBG, "\n\rInit: SDCARD_V2\n\r");
obaratakahiro 0:e9f20ea63046 197 cdv = 1;
obaratakahiro 0:e9f20ea63046 198 return SDCARD_V2;
obaratakahiro 0:e9f20ea63046 199 }
obaratakahiro 0:e9f20ea63046 200 }
obaratakahiro 0:e9f20ea63046 201
obaratakahiro 0:e9f20ea63046 202 debug("Timeout waiting for v2.x card\n");
obaratakahiro 0:e9f20ea63046 203 return SDCARD_FAIL;
obaratakahiro 0:e9f20ea63046 204 }
obaratakahiro 0:e9f20ea63046 205
obaratakahiro 0:e9f20ea63046 206 int SDFileSystem::disk_initialize() {
obaratakahiro 0:e9f20ea63046 207 _is_initialized = initialise_card();
obaratakahiro 0:e9f20ea63046 208 if (_is_initialized == 0) {
obaratakahiro 0:e9f20ea63046 209 debug("Fail to initialize card\n");
obaratakahiro 0:e9f20ea63046 210 return 1;
obaratakahiro 0:e9f20ea63046 211 }
obaratakahiro 0:e9f20ea63046 212 debug_if(SD_DBG, "init card = %d\n", _is_initialized);
obaratakahiro 0:e9f20ea63046 213 _sectors = _sd_sectors();
obaratakahiro 0:e9f20ea63046 214
obaratakahiro 0:e9f20ea63046 215 // Set block length to 512 (CMD16)
obaratakahiro 0:e9f20ea63046 216 if (_cmd(16, 512) != 0) {
obaratakahiro 0:e9f20ea63046 217 debug("Set 512-byte block timed out\n");
obaratakahiro 0:e9f20ea63046 218 return 1;
obaratakahiro 0:e9f20ea63046 219 }
obaratakahiro 0:e9f20ea63046 220
obaratakahiro 0:e9f20ea63046 221 // Set SCK for data transfer
obaratakahiro 0:e9f20ea63046 222 _spi.frequency(_transfer_sck);
obaratakahiro 0:e9f20ea63046 223 return 0;
obaratakahiro 0:e9f20ea63046 224 }
obaratakahiro 0:e9f20ea63046 225
obaratakahiro 0:e9f20ea63046 226 int SDFileSystem::disk_write(const uint8_t* buffer, uint32_t block_number, uint32_t count) {
obaratakahiro 0:e9f20ea63046 227 if (!_is_initialized) {
obaratakahiro 0:e9f20ea63046 228 return -1;
obaratakahiro 0:e9f20ea63046 229 }
obaratakahiro 0:e9f20ea63046 230
obaratakahiro 0:e9f20ea63046 231 for (uint32_t b = block_number; b < block_number + count; b++) {
obaratakahiro 0:e9f20ea63046 232 // set write address for single block (CMD24)
obaratakahiro 0:e9f20ea63046 233 if (_cmd(24, b * cdv) != 0) {
obaratakahiro 0:e9f20ea63046 234 return 1;
obaratakahiro 0:e9f20ea63046 235 }
obaratakahiro 0:e9f20ea63046 236
obaratakahiro 0:e9f20ea63046 237 // send the data block
obaratakahiro 0:e9f20ea63046 238 _write(buffer, 512);
obaratakahiro 0:e9f20ea63046 239 buffer += 512;
obaratakahiro 0:e9f20ea63046 240 }
obaratakahiro 0:e9f20ea63046 241
obaratakahiro 0:e9f20ea63046 242 return 0;
obaratakahiro 0:e9f20ea63046 243 }
obaratakahiro 0:e9f20ea63046 244
obaratakahiro 0:e9f20ea63046 245 int SDFileSystem::disk_read(uint8_t* buffer, uint32_t block_number, uint32_t count) {
obaratakahiro 0:e9f20ea63046 246 if (!_is_initialized) {
obaratakahiro 0:e9f20ea63046 247 return -1;
obaratakahiro 0:e9f20ea63046 248 }
obaratakahiro 0:e9f20ea63046 249
obaratakahiro 0:e9f20ea63046 250 for (uint32_t b = block_number; b < block_number + count; b++) {
obaratakahiro 0:e9f20ea63046 251 // set read address for single block (CMD17)
obaratakahiro 0:e9f20ea63046 252 if (_cmd(17, b * cdv) != 0) {
obaratakahiro 0:e9f20ea63046 253 return 1;
obaratakahiro 0:e9f20ea63046 254 }
obaratakahiro 0:e9f20ea63046 255
obaratakahiro 0:e9f20ea63046 256 // receive the data
obaratakahiro 0:e9f20ea63046 257 _read(buffer, 512);
obaratakahiro 0:e9f20ea63046 258 buffer += 512;
obaratakahiro 0:e9f20ea63046 259 }
obaratakahiro 0:e9f20ea63046 260
obaratakahiro 0:e9f20ea63046 261 return 0;
obaratakahiro 0:e9f20ea63046 262 }
obaratakahiro 0:e9f20ea63046 263
obaratakahiro 0:e9f20ea63046 264 int SDFileSystem::disk_status() {
obaratakahiro 0:e9f20ea63046 265 // FATFileSystem::disk_status() returns 0 when initialized
obaratakahiro 0:e9f20ea63046 266 if (_is_initialized) {
obaratakahiro 0:e9f20ea63046 267 return 0;
obaratakahiro 0:e9f20ea63046 268 } else {
obaratakahiro 0:e9f20ea63046 269 return 1;
obaratakahiro 0:e9f20ea63046 270 }
obaratakahiro 0:e9f20ea63046 271 }
obaratakahiro 0:e9f20ea63046 272
obaratakahiro 0:e9f20ea63046 273 int SDFileSystem::disk_sync() { return 0; }
obaratakahiro 0:e9f20ea63046 274 uint32_t SDFileSystem::disk_sectors() { return _sectors; }
obaratakahiro 0:e9f20ea63046 275
obaratakahiro 0:e9f20ea63046 276
obaratakahiro 0:e9f20ea63046 277 // PRIVATE FUNCTIONS
obaratakahiro 0:e9f20ea63046 278 int SDFileSystem::_cmd(int cmd, int arg) {
obaratakahiro 0:e9f20ea63046 279 _cs = 0;
obaratakahiro 0:e9f20ea63046 280
obaratakahiro 0:e9f20ea63046 281 // send a command
obaratakahiro 0:e9f20ea63046 282 _spi.write(0x40 | cmd);
obaratakahiro 0:e9f20ea63046 283 _spi.write(arg >> 24);
obaratakahiro 0:e9f20ea63046 284 _spi.write(arg >> 16);
obaratakahiro 0:e9f20ea63046 285 _spi.write(arg >> 8);
obaratakahiro 0:e9f20ea63046 286 _spi.write(arg >> 0);
obaratakahiro 0:e9f20ea63046 287 _spi.write(0x95);
obaratakahiro 0:e9f20ea63046 288
obaratakahiro 0:e9f20ea63046 289 // wait for the repsonse (response[7] == 0)
obaratakahiro 0:e9f20ea63046 290 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
obaratakahiro 0:e9f20ea63046 291 int response = _spi.write(0xFF);
obaratakahiro 0:e9f20ea63046 292 if (!(response & 0x80)) {
obaratakahiro 0:e9f20ea63046 293 _cs = 1;
obaratakahiro 0:e9f20ea63046 294 _spi.write(0xFF);
obaratakahiro 0:e9f20ea63046 295 return response;
obaratakahiro 0:e9f20ea63046 296 }
obaratakahiro 0:e9f20ea63046 297 }
obaratakahiro 0:e9f20ea63046 298 _cs = 1;
obaratakahiro 0:e9f20ea63046 299 _spi.write(0xFF);
obaratakahiro 0:e9f20ea63046 300 return -1; // timeout
obaratakahiro 0:e9f20ea63046 301 }
obaratakahiro 0:e9f20ea63046 302 int SDFileSystem::_cmdx(int cmd, int arg) {
obaratakahiro 0:e9f20ea63046 303 _cs = 0;
obaratakahiro 0:e9f20ea63046 304
obaratakahiro 0:e9f20ea63046 305 // send a command
obaratakahiro 0:e9f20ea63046 306 _spi.write(0x40 | cmd);
obaratakahiro 0:e9f20ea63046 307 _spi.write(arg >> 24);
obaratakahiro 0:e9f20ea63046 308 _spi.write(arg >> 16);
obaratakahiro 0:e9f20ea63046 309 _spi.write(arg >> 8);
obaratakahiro 0:e9f20ea63046 310 _spi.write(arg >> 0);
obaratakahiro 0:e9f20ea63046 311 _spi.write(0x95);
obaratakahiro 0:e9f20ea63046 312
obaratakahiro 0:e9f20ea63046 313 // wait for the repsonse (response[7] == 0)
obaratakahiro 0:e9f20ea63046 314 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
obaratakahiro 0:e9f20ea63046 315 int response = _spi.write(0xFF);
obaratakahiro 0:e9f20ea63046 316 if (!(response & 0x80)) {
obaratakahiro 0:e9f20ea63046 317 return response;
obaratakahiro 0:e9f20ea63046 318 }
obaratakahiro 0:e9f20ea63046 319 }
obaratakahiro 0:e9f20ea63046 320 _cs = 1;
obaratakahiro 0:e9f20ea63046 321 _spi.write(0xFF);
obaratakahiro 0:e9f20ea63046 322 return -1; // timeout
obaratakahiro 0:e9f20ea63046 323 }
obaratakahiro 0:e9f20ea63046 324
obaratakahiro 0:e9f20ea63046 325
obaratakahiro 0:e9f20ea63046 326 int SDFileSystem::_cmd58() {
obaratakahiro 0:e9f20ea63046 327 _cs = 0;
obaratakahiro 0:e9f20ea63046 328 int arg = 0;
obaratakahiro 0:e9f20ea63046 329
obaratakahiro 0:e9f20ea63046 330 // send a command
obaratakahiro 0:e9f20ea63046 331 _spi.write(0x40 | 58);
obaratakahiro 0:e9f20ea63046 332 _spi.write(arg >> 24);
obaratakahiro 0:e9f20ea63046 333 _spi.write(arg >> 16);
obaratakahiro 0:e9f20ea63046 334 _spi.write(arg >> 8);
obaratakahiro 0:e9f20ea63046 335 _spi.write(arg >> 0);
obaratakahiro 0:e9f20ea63046 336 _spi.write(0x95);
obaratakahiro 0:e9f20ea63046 337
obaratakahiro 0:e9f20ea63046 338 // wait for the repsonse (response[7] == 0)
obaratakahiro 0:e9f20ea63046 339 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
obaratakahiro 0:e9f20ea63046 340 int response = _spi.write(0xFF);
obaratakahiro 0:e9f20ea63046 341 if (!(response & 0x80)) {
obaratakahiro 0:e9f20ea63046 342 int ocr = _spi.write(0xFF) << 24;
obaratakahiro 0:e9f20ea63046 343 ocr |= _spi.write(0xFF) << 16;
obaratakahiro 0:e9f20ea63046 344 ocr |= _spi.write(0xFF) << 8;
obaratakahiro 0:e9f20ea63046 345 ocr |= _spi.write(0xFF) << 0;
obaratakahiro 0:e9f20ea63046 346 _cs = 1;
obaratakahiro 0:e9f20ea63046 347 _spi.write(0xFF);
obaratakahiro 0:e9f20ea63046 348 return response;
obaratakahiro 0:e9f20ea63046 349 }
obaratakahiro 0:e9f20ea63046 350 }
obaratakahiro 0:e9f20ea63046 351 _cs = 1;
obaratakahiro 0:e9f20ea63046 352 _spi.write(0xFF);
obaratakahiro 0:e9f20ea63046 353 return -1; // timeout
obaratakahiro 0:e9f20ea63046 354 }
obaratakahiro 0:e9f20ea63046 355
obaratakahiro 0:e9f20ea63046 356 int SDFileSystem::_cmd8() {
obaratakahiro 0:e9f20ea63046 357 _cs = 0;
obaratakahiro 0:e9f20ea63046 358
obaratakahiro 0:e9f20ea63046 359 // send a command
obaratakahiro 0:e9f20ea63046 360 _spi.write(0x40 | 8); // CMD8
obaratakahiro 0:e9f20ea63046 361 _spi.write(0x00); // reserved
obaratakahiro 0:e9f20ea63046 362 _spi.write(0x00); // reserved
obaratakahiro 0:e9f20ea63046 363 _spi.write(0x01); // 3.3v
obaratakahiro 0:e9f20ea63046 364 _spi.write(0xAA); // check pattern
obaratakahiro 0:e9f20ea63046 365 _spi.write(0x87); // crc
obaratakahiro 0:e9f20ea63046 366
obaratakahiro 0:e9f20ea63046 367 // wait for the repsonse (response[7] == 0)
obaratakahiro 0:e9f20ea63046 368 for (int i = 0; i < SD_COMMAND_TIMEOUT * 1000; i++) {
obaratakahiro 0:e9f20ea63046 369 char response[5];
obaratakahiro 0:e9f20ea63046 370 response[0] = _spi.write(0xFF);
obaratakahiro 0:e9f20ea63046 371 if (!(response[0] & 0x80)) {
obaratakahiro 0:e9f20ea63046 372 for (int j = 1; j < 5; j++) {
obaratakahiro 0:e9f20ea63046 373 response[i] = _spi.write(0xFF);
obaratakahiro 0:e9f20ea63046 374 }
obaratakahiro 0:e9f20ea63046 375 _cs = 1;
obaratakahiro 0:e9f20ea63046 376 _spi.write(0xFF);
obaratakahiro 0:e9f20ea63046 377 return response[0];
obaratakahiro 0:e9f20ea63046 378 }
obaratakahiro 0:e9f20ea63046 379 }
obaratakahiro 0:e9f20ea63046 380 _cs = 1;
obaratakahiro 0:e9f20ea63046 381 _spi.write(0xFF);
obaratakahiro 0:e9f20ea63046 382 return -1; // timeout
obaratakahiro 0:e9f20ea63046 383 }
obaratakahiro 0:e9f20ea63046 384
obaratakahiro 0:e9f20ea63046 385 int SDFileSystem::_read(uint8_t *buffer, uint32_t length) {
obaratakahiro 0:e9f20ea63046 386 _cs = 0;
obaratakahiro 0:e9f20ea63046 387
obaratakahiro 0:e9f20ea63046 388 // read until start byte (0xFF)
obaratakahiro 0:e9f20ea63046 389 while (_spi.write(0xFF) != 0xFE);
obaratakahiro 0:e9f20ea63046 390
obaratakahiro 0:e9f20ea63046 391 // read data
obaratakahiro 0:e9f20ea63046 392 for (uint32_t i = 0; i < length; i++) {
obaratakahiro 0:e9f20ea63046 393 buffer[i] = _spi.write(0xFF);
obaratakahiro 0:e9f20ea63046 394 }
obaratakahiro 0:e9f20ea63046 395 _spi.write(0xFF); // checksum
obaratakahiro 0:e9f20ea63046 396 _spi.write(0xFF);
obaratakahiro 0:e9f20ea63046 397
obaratakahiro 0:e9f20ea63046 398 _cs = 1;
obaratakahiro 0:e9f20ea63046 399 _spi.write(0xFF);
obaratakahiro 0:e9f20ea63046 400 return 0;
obaratakahiro 0:e9f20ea63046 401 }
obaratakahiro 0:e9f20ea63046 402
obaratakahiro 0:e9f20ea63046 403 int SDFileSystem::_write(const uint8_t*buffer, uint32_t length) {
obaratakahiro 0:e9f20ea63046 404 _cs = 0;
obaratakahiro 0:e9f20ea63046 405
obaratakahiro 0:e9f20ea63046 406 // indicate start of block
obaratakahiro 0:e9f20ea63046 407 _spi.write(0xFE);
obaratakahiro 0:e9f20ea63046 408
obaratakahiro 0:e9f20ea63046 409 // write the data
obaratakahiro 0:e9f20ea63046 410 for (uint32_t i = 0; i < length; i++) {
obaratakahiro 0:e9f20ea63046 411 _spi.write(buffer[i]);
obaratakahiro 0:e9f20ea63046 412 }
obaratakahiro 0:e9f20ea63046 413
obaratakahiro 0:e9f20ea63046 414 // write the checksum
obaratakahiro 0:e9f20ea63046 415 _spi.write(0xFF);
obaratakahiro 0:e9f20ea63046 416 _spi.write(0xFF);
obaratakahiro 0:e9f20ea63046 417
obaratakahiro 0:e9f20ea63046 418 // check the response token
obaratakahiro 0:e9f20ea63046 419 if ((_spi.write(0xFF) & 0x1F) != 0x05) {
obaratakahiro 0:e9f20ea63046 420 _cs = 1;
obaratakahiro 0:e9f20ea63046 421 _spi.write(0xFF);
obaratakahiro 0:e9f20ea63046 422 return 1;
obaratakahiro 0:e9f20ea63046 423 }
obaratakahiro 0:e9f20ea63046 424
obaratakahiro 0:e9f20ea63046 425 // wait for write to finish
obaratakahiro 0:e9f20ea63046 426 while (_spi.write(0xFF) == 0);
obaratakahiro 0:e9f20ea63046 427
obaratakahiro 0:e9f20ea63046 428 _cs = 1;
obaratakahiro 0:e9f20ea63046 429 _spi.write(0xFF);
obaratakahiro 0:e9f20ea63046 430 return 0;
obaratakahiro 0:e9f20ea63046 431 }
obaratakahiro 0:e9f20ea63046 432
obaratakahiro 0:e9f20ea63046 433 static uint32_t ext_bits(unsigned char *data, int msb, int lsb) {
obaratakahiro 0:e9f20ea63046 434 uint32_t bits = 0;
obaratakahiro 0:e9f20ea63046 435 uint32_t size = 1 + msb - lsb;
obaratakahiro 0:e9f20ea63046 436 for (uint32_t i = 0; i < size; i++) {
obaratakahiro 0:e9f20ea63046 437 uint32_t position = lsb + i;
obaratakahiro 0:e9f20ea63046 438 uint32_t byte = 15 - (position >> 3);
obaratakahiro 0:e9f20ea63046 439 uint32_t bit = position & 0x7;
obaratakahiro 0:e9f20ea63046 440 uint32_t value = (data[byte] >> bit) & 1;
obaratakahiro 0:e9f20ea63046 441 bits |= value << i;
obaratakahiro 0:e9f20ea63046 442 }
obaratakahiro 0:e9f20ea63046 443 return bits;
obaratakahiro 0:e9f20ea63046 444 }
obaratakahiro 0:e9f20ea63046 445
obaratakahiro 0:e9f20ea63046 446 uint32_t SDFileSystem::_sd_sectors() {
obaratakahiro 0:e9f20ea63046 447 uint32_t c_size, c_size_mult, read_bl_len;
obaratakahiro 0:e9f20ea63046 448 uint32_t block_len, mult, blocknr, capacity;
obaratakahiro 0:e9f20ea63046 449 uint32_t hc_c_size;
obaratakahiro 0:e9f20ea63046 450 uint32_t blocks;
obaratakahiro 0:e9f20ea63046 451
obaratakahiro 0:e9f20ea63046 452 // CMD9, Response R2 (R1 byte + 16-byte block read)
obaratakahiro 0:e9f20ea63046 453 if (_cmdx(9, 0) != 0) {
obaratakahiro 0:e9f20ea63046 454 debug("Didn't get a response from the disk\n");
obaratakahiro 0:e9f20ea63046 455 return 0;
obaratakahiro 0:e9f20ea63046 456 }
obaratakahiro 0:e9f20ea63046 457
obaratakahiro 0:e9f20ea63046 458 uint8_t csd[16];
obaratakahiro 0:e9f20ea63046 459 if (_read(csd, 16) != 0) {
obaratakahiro 0:e9f20ea63046 460 debug("Couldn't read csd response from disk\n");
obaratakahiro 0:e9f20ea63046 461 return 0;
obaratakahiro 0:e9f20ea63046 462 }
obaratakahiro 0:e9f20ea63046 463
obaratakahiro 0:e9f20ea63046 464 // csd_structure : csd[127:126]
obaratakahiro 0:e9f20ea63046 465 // c_size : csd[73:62]
obaratakahiro 0:e9f20ea63046 466 // c_size_mult : csd[49:47]
obaratakahiro 0:e9f20ea63046 467 // read_bl_len : csd[83:80] - the *maximum* read block length
obaratakahiro 0:e9f20ea63046 468
obaratakahiro 0:e9f20ea63046 469 int csd_structure = ext_bits(csd, 127, 126);
obaratakahiro 0:e9f20ea63046 470
obaratakahiro 0:e9f20ea63046 471 switch (csd_structure) {
obaratakahiro 0:e9f20ea63046 472 case 0:
obaratakahiro 0:e9f20ea63046 473 cdv = 512;
obaratakahiro 0:e9f20ea63046 474 c_size = ext_bits(csd, 73, 62);
obaratakahiro 0:e9f20ea63046 475 c_size_mult = ext_bits(csd, 49, 47);
obaratakahiro 0:e9f20ea63046 476 read_bl_len = ext_bits(csd, 83, 80);
obaratakahiro 0:e9f20ea63046 477
obaratakahiro 0:e9f20ea63046 478 block_len = 1 << read_bl_len;
obaratakahiro 0:e9f20ea63046 479 mult = 1 << (c_size_mult + 2);
obaratakahiro 0:e9f20ea63046 480 blocknr = (c_size + 1) * mult;
obaratakahiro 0:e9f20ea63046 481 capacity = blocknr * block_len;
obaratakahiro 0:e9f20ea63046 482 blocks = capacity / 512;
obaratakahiro 0:e9f20ea63046 483 debug_if(SD_DBG, "\n\rSDCard\n\rc_size: %d \n\rcapacity: %ld \n\rsectors: %lld\n\r", c_size, capacity, blocks);
obaratakahiro 0:e9f20ea63046 484 break;
obaratakahiro 0:e9f20ea63046 485
obaratakahiro 0:e9f20ea63046 486 case 1:
obaratakahiro 0:e9f20ea63046 487 cdv = 1;
obaratakahiro 0:e9f20ea63046 488 hc_c_size = ext_bits(csd, 63, 48);
obaratakahiro 0:e9f20ea63046 489 blocks = (hc_c_size+1)*1024;
obaratakahiro 0:e9f20ea63046 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);
obaratakahiro 0:e9f20ea63046 491 break;
obaratakahiro 0:e9f20ea63046 492
obaratakahiro 0:e9f20ea63046 493 default:
obaratakahiro 0:e9f20ea63046 494 debug("CSD struct unsupported\r\n");
obaratakahiro 0:e9f20ea63046 495 return 0;
obaratakahiro 0:e9f20ea63046 496 };
obaratakahiro 0:e9f20ea63046 497 return blocks;
obaratakahiro 0:e9f20ea63046 498 }