Mateusz Wójcik / Mbed 2 deprecated FRDMK64_SDCard

Demo

Dependencies:   mbed

SDFileSystem/SDFileSystem.cpp@0:e2da1a4652f5, 2017-11-18 (annotated)

Committer:
kudlatykaskader
Date:
Sat Nov 18 22:04:50 2017 +0000
Revision:
0:e2da1a4652f5
commit;

Who changed what in which revision?

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kudlatykaskader 0:e2da1a4652f5 1 /* mbed Microcontroller Library
kudlatykaskader 0:e2da1a4652f5 2 * Copyright (c) 2006-2012 ARM Limited
kudlatykaskader 0:e2da1a4652f5 3 *
kudlatykaskader 0:e2da1a4652f5 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
kudlatykaskader 0:e2da1a4652f5 5 * of this software and associated documentation files (the "Software"), to deal
kudlatykaskader 0:e2da1a4652f5 6 * in the Software without restriction, including without limitation the rights
kudlatykaskader 0:e2da1a4652f5 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
kudlatykaskader 0:e2da1a4652f5 8 * copies of the Software, and to permit persons to whom the Software is
kudlatykaskader 0:e2da1a4652f5 9 * furnished to do so, subject to the following conditions:
kudlatykaskader 0:e2da1a4652f5 10 *
kudlatykaskader 0:e2da1a4652f5 11 * The above copyright notice and this permission notice shall be included in
kudlatykaskader 0:e2da1a4652f5 12 * all copies or substantial portions of the Software.
kudlatykaskader 0:e2da1a4652f5 13 *
kudlatykaskader 0:e2da1a4652f5 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
kudlatykaskader 0:e2da1a4652f5 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
kudlatykaskader 0:e2da1a4652f5 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
kudlatykaskader 0:e2da1a4652f5 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
kudlatykaskader 0:e2da1a4652f5 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
kudlatykaskader 0:e2da1a4652f5 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
kudlatykaskader 0:e2da1a4652f5 20 * SOFTWARE.
kudlatykaskader 0:e2da1a4652f5 21 */
kudlatykaskader 0:e2da1a4652f5 22 /* Introduction
kudlatykaskader 0:e2da1a4652f5 23 * ------------
kudlatykaskader 0:e2da1a4652f5 24 * SD and MMC cards support a number of interfaces, but common to them all
kudlatykaskader 0:e2da1a4652f5 25 * is one based on SPI. This is the one I'm implmenting because it means
kudlatykaskader 0:e2da1a4652f5 26 * it is much more portable even though not so performant, and we already
kudlatykaskader 0:e2da1a4652f5 27 * have the mbed SPI Interface!
kudlatykaskader 0:e2da1a4652f5 28 *
kudlatykaskader 0:e2da1a4652f5 29 * The main reference I'm using is Chapter 7, "SPI Mode" of:
kudlatykaskader 0:e2da1a4652f5 30 * http://www.sdcard.org/developers/tech/sdcard/pls/Simplified_Physical_Layer_Spec.pdf
kudlatykaskader 0:e2da1a4652f5 31 *
kudlatykaskader 0:e2da1a4652f5 32 * SPI Startup
kudlatykaskader 0:e2da1a4652f5 33 * -----------
kudlatykaskader 0:e2da1a4652f5 34 * The SD card powers up in SD mode. The SPI interface mode is selected by
kudlatykaskader 0:e2da1a4652f5 35 * asserting CS low and sending the reset command (CMD0). The card will
kudlatykaskader 0:e2da1a4652f5 36 * respond with a (R1) response.
kudlatykaskader 0:e2da1a4652f5 37 *
kudlatykaskader 0:e2da1a4652f5 38 * CMD8 is optionally sent to determine the voltage range supported, and
kudlatykaskader 0:e2da1a4652f5 39 * indirectly determine whether it is a version 1.x SD/non-SD card or
kudlatykaskader 0:e2da1a4652f5 40 * version 2.x. I'll just ignore this for now.
kudlatykaskader 0:e2da1a4652f5 41 *
kudlatykaskader 0:e2da1a4652f5 42 * ACMD41 is repeatedly issued to initialise the card, until "in idle"
kudlatykaskader 0:e2da1a4652f5 43 * (bit 0) of the R1 response goes to '0', indicating it is initialised.
kudlatykaskader 0:e2da1a4652f5 44 *
kudlatykaskader 0:e2da1a4652f5 45 * You should also indicate whether the host supports High Capicity cards,
kudlatykaskader 0:e2da1a4652f5 46 * and check whether the card is high capacity - i'll also ignore this
kudlatykaskader 0:e2da1a4652f5 47 *
kudlatykaskader 0:e2da1a4652f5 48 * SPI Protocol
kudlatykaskader 0:e2da1a4652f5 49 * ------------
kudlatykaskader 0:e2da1a4652f5 50 * The SD SPI protocol is based on transactions made up of 8-bit words, with
kudlatykaskader 0:e2da1a4652f5 51 * the host starting every bus transaction by asserting the CS signal low. The
kudlatykaskader 0:e2da1a4652f5 52 * card always responds to commands, data blocks and errors.
kudlatykaskader 0:e2da1a4652f5 53 *
kudlatykaskader 0:e2da1a4652f5 54 * The protocol supports a CRC, but by default it is off (except for the
kudlatykaskader 0:e2da1a4652f5 55 * first reset CMD0, where the CRC can just be pre-calculated, and CMD8)
kudlatykaskader 0:e2da1a4652f5 56 * I'll leave the CRC off I think!
kudlatykaskader 0:e2da1a4652f5 57 *
kudlatykaskader 0:e2da1a4652f5 58 * Standard capacity cards have variable data block sizes, whereas High
kudlatykaskader 0:e2da1a4652f5 59 * Capacity cards fix the size of data block to 512 bytes. I'll therefore
kudlatykaskader 0:e2da1a4652f5 60 * just always use the Standard Capacity cards with a block size of 512 bytes.
kudlatykaskader 0:e2da1a4652f5 61 * This is set with CMD16.
kudlatykaskader 0:e2da1a4652f5 62 *
kudlatykaskader 0:e2da1a4652f5 63 * You can read and write single blocks (CMD17, CMD25) or multiple blocks
kudlatykaskader 0:e2da1a4652f5 64 * (CMD18, CMD25). For simplicity, I'll just use single block accesses. When
kudlatykaskader 0:e2da1a4652f5 65 * the card gets a read command, it responds with a response token, and then
kudlatykaskader 0:e2da1a4652f5 66 * a data token or an error.
kudlatykaskader 0:e2da1a4652f5 67 *
kudlatykaskader 0:e2da1a4652f5 68 * SPI Command Format
kudlatykaskader 0:e2da1a4652f5 69 * ------------------
kudlatykaskader 0:e2da1a4652f5 70 * Commands are 6-bytes long, containing the command, 32-bit argument, and CRC.
kudlatykaskader 0:e2da1a4652f5 71 *
kudlatykaskader 0:e2da1a4652f5 72 * +---------------+------------+------------+-----------+----------+--------------+
kudlatykaskader 0:e2da1a4652f5 73 * | 01 | cmd[5:0] | arg[31:24] | arg[23:16] | arg[15:8] | arg[7:0] | crc[6:0] | 1 |
kudlatykaskader 0:e2da1a4652f5 74 * +---------------+------------+------------+-----------+----------+--------------+
kudlatykaskader 0:e2da1a4652f5 75 *
kudlatykaskader 0:e2da1a4652f5 76 * As I'm not using CRC, I can fix that byte to what is needed for CMD0 (0x95)
kudlatykaskader 0:e2da1a4652f5 77 *
kudlatykaskader 0:e2da1a4652f5 78 * All Application Specific commands shall be preceded with APP_CMD (CMD55).
kudlatykaskader 0:e2da1a4652f5 79 *
kudlatykaskader 0:e2da1a4652f5 80 * SPI Response Format
kudlatykaskader 0:e2da1a4652f5 81 * -------------------
kudlatykaskader 0:e2da1a4652f5 82 * The main response format (R1) is a status byte (normally zero). Key flags:
kudlatykaskader 0:e2da1a4652f5 83 * idle - 1 if the card is in an idle state/initialising
kudlatykaskader 0:e2da1a4652f5 84 * cmd - 1 if an illegal command code was detected
kudlatykaskader 0:e2da1a4652f5 85 *
kudlatykaskader 0:e2da1a4652f5 86 * +-------------------------------------------------+
kudlatykaskader 0:e2da1a4652f5 87 * R1 | 0 | arg | addr | seq | crc | cmd | erase | idle |
kudlatykaskader 0:e2da1a4652f5 88 * +-------------------------------------------------+
kudlatykaskader 0:e2da1a4652f5 89 *
kudlatykaskader 0:e2da1a4652f5 90 * R1b is the same, except it is followed by a busy signal (zeros) until
kudlatykaskader 0:e2da1a4652f5 91 * the first non-zero byte when it is ready again.
kudlatykaskader 0:e2da1a4652f5 92 *
kudlatykaskader 0:e2da1a4652f5 93 * Data Response Token
kudlatykaskader 0:e2da1a4652f5 94 * -------------------
kudlatykaskader 0:e2da1a4652f5 95 * Every data block written to the card is acknowledged by a byte
kudlatykaskader 0:e2da1a4652f5 96 * response token
kudlatykaskader 0:e2da1a4652f5 97 *
kudlatykaskader 0:e2da1a4652f5 98 * +----------------------+
kudlatykaskader 0:e2da1a4652f5 99 * | xxx | 0 | status | 1 |
kudlatykaskader 0:e2da1a4652f5 100 * +----------------------+
kudlatykaskader 0:e2da1a4652f5 101 * 010 - OK!
kudlatykaskader 0:e2da1a4652f5 102 * 101 - CRC Error
kudlatykaskader 0:e2da1a4652f5 103 * 110 - Write Error
kudlatykaskader 0:e2da1a4652f5 104 *
kudlatykaskader 0:e2da1a4652f5 105 * Single Block Read and Write
kudlatykaskader 0:e2da1a4652f5 106 * ---------------------------
kudlatykaskader 0:e2da1a4652f5 107 *
kudlatykaskader 0:e2da1a4652f5 108 * Block transfers have a byte header, followed by the data, followed
kudlatykaskader 0:e2da1a4652f5 109 * by a 16-bit CRC. In our case, the data will always be 512 bytes.
kudlatykaskader 0:e2da1a4652f5 110 *
kudlatykaskader 0:e2da1a4652f5 111 * +------+---------+---------+- - - -+---------+-----------+----------+
kudlatykaskader 0:e2da1a4652f5 112 * | 0xFE | data[0] | data[1] | | data[n] | crc[15:8] | crc[7:0] |
kudlatykaskader 0:e2da1a4652f5 113 * +------+---------+---------+- - - -+---------+-----------+----------+
kudlatykaskader 0:e2da1a4652f5 114 */
kudlatykaskader 0:e2da1a4652f5 115 #include "SDFileSystem.h"
kudlatykaskader 0:e2da1a4652f5 116 #include "mbed_debug.h"
kudlatykaskader 0:e2da1a4652f5 117
kudlatykaskader 0:e2da1a4652f5 118 #define SD_COMMAND_TIMEOUT 5000
kudlatykaskader 0:e2da1a4652f5 119
kudlatykaskader 0:e2da1a4652f5 120 #define SD_DBG 0
kudlatykaskader 0:e2da1a4652f5 121
kudlatykaskader 0:e2da1a4652f5 122 SDFileSystem::SDFileSystem(PinName mosi, PinName miso, PinName sclk, PinName cs, const char* name) :
kudlatykaskader 0:e2da1a4652f5 123 FATFileSystem(name), _spi(mosi, miso, sclk), _cs(cs), _is_initialized(0) {
kudlatykaskader 0:e2da1a4652f5 124 _cs = 1;
kudlatykaskader 0:e2da1a4652f5 125
kudlatykaskader 0:e2da1a4652f5 126 // Set default to 100kHz for initialisation and 1MHz for data transfer
kudlatykaskader 0:e2da1a4652f5 127 _init_sck = 100000;
kudlatykaskader 0:e2da1a4652f5 128 _transfer_sck = 1000000;
kudlatykaskader 0:e2da1a4652f5 129 }
kudlatykaskader 0:e2da1a4652f5 130
kudlatykaskader 0:e2da1a4652f5 131 #define R1_IDLE_STATE (1 << 0)
kudlatykaskader 0:e2da1a4652f5 132 #define R1_ERASE_RESET (1 << 1)
kudlatykaskader 0:e2da1a4652f5 133 #define R1_ILLEGAL_COMMAND (1 << 2)
kudlatykaskader 0:e2da1a4652f5 134 #define R1_COM_CRC_ERROR (1 << 3)
kudlatykaskader 0:e2da1a4652f5 135 #define R1_ERASE_SEQUENCE_ERROR (1 << 4)
kudlatykaskader 0:e2da1a4652f5 136 #define R1_ADDRESS_ERROR (1 << 5)
kudlatykaskader 0:e2da1a4652f5 137 #define R1_PARAMETER_ERROR (1 << 6)
kudlatykaskader 0:e2da1a4652f5 138
kudlatykaskader 0:e2da1a4652f5 139 // Types
kudlatykaskader 0:e2da1a4652f5 140 // - v1.x Standard Capacity
kudlatykaskader 0:e2da1a4652f5 141 // - v2.x Standard Capacity
kudlatykaskader 0:e2da1a4652f5 142 // - v2.x High Capacity
kudlatykaskader 0:e2da1a4652f5 143 // - Not recognised as an SD Card
kudlatykaskader 0:e2da1a4652f5 144 #define SDCARD_FAIL 0
kudlatykaskader 0:e2da1a4652f5 145 #define SDCARD_V1 1
kudlatykaskader 0:e2da1a4652f5 146 #define SDCARD_V2 2
kudlatykaskader 0:e2da1a4652f5 147 #define SDCARD_V2HC 3
kudlatykaskader 0:e2da1a4652f5 148
kudlatykaskader 0:e2da1a4652f5 149 int SDFileSystem::initialise_card() {
kudlatykaskader 0:e2da1a4652f5 150 // Set to SCK for initialisation, and clock card with cs = 1
kudlatykaskader 0:e2da1a4652f5 151 _spi.frequency(_init_sck);
kudlatykaskader 0:e2da1a4652f5 152 _cs = 1;
kudlatykaskader 0:e2da1a4652f5 153 for (int i = 0; i < 16; i++) {
kudlatykaskader 0:e2da1a4652f5 154 _spi.write(0xFF);
kudlatykaskader 0:e2da1a4652f5 155 }
kudlatykaskader 0:e2da1a4652f5 156
kudlatykaskader 0:e2da1a4652f5 157 // send CMD0, should return with all zeros except IDLE STATE set (bit 0)
kudlatykaskader 0:e2da1a4652f5 158 if (_cmd(0, 0) != R1_IDLE_STATE) {
kudlatykaskader 0:e2da1a4652f5 159 debug("No disk, or could not put SD card in to SPI idle state\n");
kudlatykaskader 0:e2da1a4652f5 160 return SDCARD_FAIL;
kudlatykaskader 0:e2da1a4652f5 161 }
kudlatykaskader 0:e2da1a4652f5 162
kudlatykaskader 0:e2da1a4652f5 163 // send CMD8 to determine whther it is ver 2.x
kudlatykaskader 0:e2da1a4652f5 164 int r = _cmd8();
kudlatykaskader 0:e2da1a4652f5 165 if (r == R1_IDLE_STATE) {
kudlatykaskader 0:e2da1a4652f5 166 return initialise_card_v2();
kudlatykaskader 0:e2da1a4652f5 167 } else if (r == (R1_IDLE_STATE | R1_ILLEGAL_COMMAND)) {
kudlatykaskader 0:e2da1a4652f5 168 return initialise_card_v1();
kudlatykaskader 0:e2da1a4652f5 169 } else {
kudlatykaskader 0:e2da1a4652f5 170 debug("Not in idle state after sending CMD8 (not an SD card?)\n");
kudlatykaskader 0:e2da1a4652f5 171 return SDCARD_FAIL;
kudlatykaskader 0:e2da1a4652f5 172 }
kudlatykaskader 0:e2da1a4652f5 173 }
kudlatykaskader 0:e2da1a4652f5 174
kudlatykaskader 0:e2da1a4652f5 175 int SDFileSystem::initialise_card_v1() {
kudlatykaskader 0:e2da1a4652f5 176 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
kudlatykaskader 0:e2da1a4652f5 177 _cmd(55, 0);
kudlatykaskader 0:e2da1a4652f5 178 if (_cmd(41, 0) == 0) {
kudlatykaskader 0:e2da1a4652f5 179 cdv = 512;
kudlatykaskader 0:e2da1a4652f5 180 debug_if(SD_DBG, "\n\rInit: SEDCARD_V1\n\r");
kudlatykaskader 0:e2da1a4652f5 181 return SDCARD_V1;
kudlatykaskader 0:e2da1a4652f5 182 }
kudlatykaskader 0:e2da1a4652f5 183 }
kudlatykaskader 0:e2da1a4652f5 184
kudlatykaskader 0:e2da1a4652f5 185 debug("Timeout waiting for v1.x card\n");
kudlatykaskader 0:e2da1a4652f5 186 return SDCARD_FAIL;
kudlatykaskader 0:e2da1a4652f5 187 }
kudlatykaskader 0:e2da1a4652f5 188
kudlatykaskader 0:e2da1a4652f5 189 int SDFileSystem::initialise_card_v2() {
kudlatykaskader 0:e2da1a4652f5 190 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
kudlatykaskader 0:e2da1a4652f5 191 wait_ms(50);
kudlatykaskader 0:e2da1a4652f5 192 _cmd58();
kudlatykaskader 0:e2da1a4652f5 193 _cmd(55, 0);
kudlatykaskader 0:e2da1a4652f5 194 if (_cmd(41, 0x40000000) == 0) {
kudlatykaskader 0:e2da1a4652f5 195 _cmd58();
kudlatykaskader 0:e2da1a4652f5 196 debug_if(SD_DBG, "\n\rInit: SDCARD_V2\n\r");
kudlatykaskader 0:e2da1a4652f5 197 cdv = 1;
kudlatykaskader 0:e2da1a4652f5 198 return SDCARD_V2;
kudlatykaskader 0:e2da1a4652f5 199 }
kudlatykaskader 0:e2da1a4652f5 200 }
kudlatykaskader 0:e2da1a4652f5 201
kudlatykaskader 0:e2da1a4652f5 202 debug("Timeout waiting for v2.x card\n");
kudlatykaskader 0:e2da1a4652f5 203 return SDCARD_FAIL;
kudlatykaskader 0:e2da1a4652f5 204 }
kudlatykaskader 0:e2da1a4652f5 205
kudlatykaskader 0:e2da1a4652f5 206 int SDFileSystem::disk_initialize() {
kudlatykaskader 0:e2da1a4652f5 207 _is_initialized = initialise_card();
kudlatykaskader 0:e2da1a4652f5 208 if (_is_initialized == 0) {
kudlatykaskader 0:e2da1a4652f5 209 debug("Fail to initialize card\n");
kudlatykaskader 0:e2da1a4652f5 210 return 1;
kudlatykaskader 0:e2da1a4652f5 211 }
kudlatykaskader 0:e2da1a4652f5 212 debug_if(SD_DBG, "init card = %d\n", _is_initialized);
kudlatykaskader 0:e2da1a4652f5 213 _sectors = _sd_sectors();
kudlatykaskader 0:e2da1a4652f5 214
kudlatykaskader 0:e2da1a4652f5 215 // Set block length to 512 (CMD16)
kudlatykaskader 0:e2da1a4652f5 216 if (_cmd(16, 512) != 0) {
kudlatykaskader 0:e2da1a4652f5 217 debug("Set 512-byte block timed out\n");
kudlatykaskader 0:e2da1a4652f5 218 return 1;
kudlatykaskader 0:e2da1a4652f5 219 }
kudlatykaskader 0:e2da1a4652f5 220
kudlatykaskader 0:e2da1a4652f5 221 // Set SCK for data transfer
kudlatykaskader 0:e2da1a4652f5 222 _spi.frequency(_transfer_sck);
kudlatykaskader 0:e2da1a4652f5 223 return 0;
kudlatykaskader 0:e2da1a4652f5 224 }
kudlatykaskader 0:e2da1a4652f5 225
kudlatykaskader 0:e2da1a4652f5 226 int SDFileSystem::disk_write(const uint8_t* buffer, uint32_t block_number, uint32_t count) {
kudlatykaskader 0:e2da1a4652f5 227 if (!_is_initialized) {
kudlatykaskader 0:e2da1a4652f5 228 return -1;
kudlatykaskader 0:e2da1a4652f5 229 }
kudlatykaskader 0:e2da1a4652f5 230
kudlatykaskader 0:e2da1a4652f5 231 for (uint32_t b = block_number; b < block_number + count; b++) {
kudlatykaskader 0:e2da1a4652f5 232 // set write address for single block (CMD24)
kudlatykaskader 0:e2da1a4652f5 233 if (_cmd(24, b * cdv) != 0) {
kudlatykaskader 0:e2da1a4652f5 234 return 1;
kudlatykaskader 0:e2da1a4652f5 235 }
kudlatykaskader 0:e2da1a4652f5 236
kudlatykaskader 0:e2da1a4652f5 237 // send the data block
kudlatykaskader 0:e2da1a4652f5 238 _write(buffer, 512);
kudlatykaskader 0:e2da1a4652f5 239 buffer += 512;
kudlatykaskader 0:e2da1a4652f5 240 }
kudlatykaskader 0:e2da1a4652f5 241
kudlatykaskader 0:e2da1a4652f5 242 return 0;
kudlatykaskader 0:e2da1a4652f5 243 }
kudlatykaskader 0:e2da1a4652f5 244
kudlatykaskader 0:e2da1a4652f5 245 int SDFileSystem::disk_read(uint8_t* buffer, uint32_t block_number, uint32_t count) {
kudlatykaskader 0:e2da1a4652f5 246 if (!_is_initialized) {
kudlatykaskader 0:e2da1a4652f5 247 return -1;
kudlatykaskader 0:e2da1a4652f5 248 }
kudlatykaskader 0:e2da1a4652f5 249
kudlatykaskader 0:e2da1a4652f5 250 for (uint32_t b = block_number; b < block_number + count; b++) {
kudlatykaskader 0:e2da1a4652f5 251 // set read address for single block (CMD17)
kudlatykaskader 0:e2da1a4652f5 252 if (_cmd(17, b * cdv) != 0) {
kudlatykaskader 0:e2da1a4652f5 253 return 1;
kudlatykaskader 0:e2da1a4652f5 254 }
kudlatykaskader 0:e2da1a4652f5 255
kudlatykaskader 0:e2da1a4652f5 256 // receive the data
kudlatykaskader 0:e2da1a4652f5 257 _read(buffer, 512);
kudlatykaskader 0:e2da1a4652f5 258 buffer += 512;
kudlatykaskader 0:e2da1a4652f5 259 }
kudlatykaskader 0:e2da1a4652f5 260
kudlatykaskader 0:e2da1a4652f5 261 return 0;
kudlatykaskader 0:e2da1a4652f5 262 }
kudlatykaskader 0:e2da1a4652f5 263
kudlatykaskader 0:e2da1a4652f5 264 int SDFileSystem::disk_status() {
kudlatykaskader 0:e2da1a4652f5 265 // FATFileSystem::disk_status() returns 0 when initialized
kudlatykaskader 0:e2da1a4652f5 266 if (_is_initialized) {
kudlatykaskader 0:e2da1a4652f5 267 return 0;
kudlatykaskader 0:e2da1a4652f5 268 } else {
kudlatykaskader 0:e2da1a4652f5 269 return 1;
kudlatykaskader 0:e2da1a4652f5 270 }
kudlatykaskader 0:e2da1a4652f5 271 }
kudlatykaskader 0:e2da1a4652f5 272
kudlatykaskader 0:e2da1a4652f5 273 int SDFileSystem::disk_sync() { return 0; }
kudlatykaskader 0:e2da1a4652f5 274 uint32_t SDFileSystem::disk_sectors() { return _sectors; }
kudlatykaskader 0:e2da1a4652f5 275
kudlatykaskader 0:e2da1a4652f5 276
kudlatykaskader 0:e2da1a4652f5 277 // PRIVATE FUNCTIONS
kudlatykaskader 0:e2da1a4652f5 278 int SDFileSystem::_cmd(int cmd, int arg) {
kudlatykaskader 0:e2da1a4652f5 279 _cs = 0;
kudlatykaskader 0:e2da1a4652f5 280
kudlatykaskader 0:e2da1a4652f5 281 // send a command
kudlatykaskader 0:e2da1a4652f5 282 _spi.write(0x40 | cmd);
kudlatykaskader 0:e2da1a4652f5 283 _spi.write(arg >> 24);
kudlatykaskader 0:e2da1a4652f5 284 _spi.write(arg >> 16);
kudlatykaskader 0:e2da1a4652f5 285 _spi.write(arg >> 8);
kudlatykaskader 0:e2da1a4652f5 286 _spi.write(arg >> 0);
kudlatykaskader 0:e2da1a4652f5 287 _spi.write(0x95);
kudlatykaskader 0:e2da1a4652f5 288
kudlatykaskader 0:e2da1a4652f5 289 // wait for the repsonse (response[7] == 0)
kudlatykaskader 0:e2da1a4652f5 290 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
kudlatykaskader 0:e2da1a4652f5 291 int response = _spi.write(0xFF);
kudlatykaskader 0:e2da1a4652f5 292 if (!(response & 0x80)) {
kudlatykaskader 0:e2da1a4652f5 293 _cs = 1;
kudlatykaskader 0:e2da1a4652f5 294 _spi.write(0xFF);
kudlatykaskader 0:e2da1a4652f5 295 return response;
kudlatykaskader 0:e2da1a4652f5 296 }
kudlatykaskader 0:e2da1a4652f5 297 }
kudlatykaskader 0:e2da1a4652f5 298 _cs = 1;
kudlatykaskader 0:e2da1a4652f5 299 _spi.write(0xFF);
kudlatykaskader 0:e2da1a4652f5 300 return -1; // timeout
kudlatykaskader 0:e2da1a4652f5 301 }
kudlatykaskader 0:e2da1a4652f5 302 int SDFileSystem::_cmdx(int cmd, int arg) {
kudlatykaskader 0:e2da1a4652f5 303 _cs = 0;
kudlatykaskader 0:e2da1a4652f5 304
kudlatykaskader 0:e2da1a4652f5 305 // send a command
kudlatykaskader 0:e2da1a4652f5 306 _spi.write(0x40 | cmd);
kudlatykaskader 0:e2da1a4652f5 307 _spi.write(arg >> 24);
kudlatykaskader 0:e2da1a4652f5 308 _spi.write(arg >> 16);
kudlatykaskader 0:e2da1a4652f5 309 _spi.write(arg >> 8);
kudlatykaskader 0:e2da1a4652f5 310 _spi.write(arg >> 0);
kudlatykaskader 0:e2da1a4652f5 311 _spi.write(0x95);
kudlatykaskader 0:e2da1a4652f5 312
kudlatykaskader 0:e2da1a4652f5 313 // wait for the repsonse (response[7] == 0)
kudlatykaskader 0:e2da1a4652f5 314 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
kudlatykaskader 0:e2da1a4652f5 315 int response = _spi.write(0xFF);
kudlatykaskader 0:e2da1a4652f5 316 if (!(response & 0x80)) {
kudlatykaskader 0:e2da1a4652f5 317 return response;
kudlatykaskader 0:e2da1a4652f5 318 }
kudlatykaskader 0:e2da1a4652f5 319 }
kudlatykaskader 0:e2da1a4652f5 320 _cs = 1;
kudlatykaskader 0:e2da1a4652f5 321 _spi.write(0xFF);
kudlatykaskader 0:e2da1a4652f5 322 return -1; // timeout
kudlatykaskader 0:e2da1a4652f5 323 }
kudlatykaskader 0:e2da1a4652f5 324
kudlatykaskader 0:e2da1a4652f5 325
kudlatykaskader 0:e2da1a4652f5 326 int SDFileSystem::_cmd58() {
kudlatykaskader 0:e2da1a4652f5 327 _cs = 0;
kudlatykaskader 0:e2da1a4652f5 328 int arg = 0;
kudlatykaskader 0:e2da1a4652f5 329
kudlatykaskader 0:e2da1a4652f5 330 // send a command
kudlatykaskader 0:e2da1a4652f5 331 _spi.write(0x40 | 58);
kudlatykaskader 0:e2da1a4652f5 332 _spi.write(arg >> 24);
kudlatykaskader 0:e2da1a4652f5 333 _spi.write(arg >> 16);
kudlatykaskader 0:e2da1a4652f5 334 _spi.write(arg >> 8);
kudlatykaskader 0:e2da1a4652f5 335 _spi.write(arg >> 0);
kudlatykaskader 0:e2da1a4652f5 336 _spi.write(0x95);
kudlatykaskader 0:e2da1a4652f5 337
kudlatykaskader 0:e2da1a4652f5 338 // wait for the repsonse (response[7] == 0)
kudlatykaskader 0:e2da1a4652f5 339 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
kudlatykaskader 0:e2da1a4652f5 340 int response = _spi.write(0xFF);
kudlatykaskader 0:e2da1a4652f5 341 if (!(response & 0x80)) {
kudlatykaskader 0:e2da1a4652f5 342 int ocr = _spi.write(0xFF) << 24;
kudlatykaskader 0:e2da1a4652f5 343 ocr |= _spi.write(0xFF) << 16;
kudlatykaskader 0:e2da1a4652f5 344 ocr |= _spi.write(0xFF) << 8;
kudlatykaskader 0:e2da1a4652f5 345 ocr |= _spi.write(0xFF) << 0;
kudlatykaskader 0:e2da1a4652f5 346 _cs = 1;
kudlatykaskader 0:e2da1a4652f5 347 _spi.write(0xFF);
kudlatykaskader 0:e2da1a4652f5 348 return response;
kudlatykaskader 0:e2da1a4652f5 349 }
kudlatykaskader 0:e2da1a4652f5 350 }
kudlatykaskader 0:e2da1a4652f5 351 _cs = 1;
kudlatykaskader 0:e2da1a4652f5 352 _spi.write(0xFF);
kudlatykaskader 0:e2da1a4652f5 353 return -1; // timeout
kudlatykaskader 0:e2da1a4652f5 354 }
kudlatykaskader 0:e2da1a4652f5 355
kudlatykaskader 0:e2da1a4652f5 356 int SDFileSystem::_cmd8() {
kudlatykaskader 0:e2da1a4652f5 357 _cs = 0;
kudlatykaskader 0:e2da1a4652f5 358
kudlatykaskader 0:e2da1a4652f5 359 // send a command
kudlatykaskader 0:e2da1a4652f5 360 _spi.write(0x40 | 8); // CMD8
kudlatykaskader 0:e2da1a4652f5 361 _spi.write(0x00); // reserved
kudlatykaskader 0:e2da1a4652f5 362 _spi.write(0x00); // reserved
kudlatykaskader 0:e2da1a4652f5 363 _spi.write(0x01); // 3.3v
kudlatykaskader 0:e2da1a4652f5 364 _spi.write(0xAA); // check pattern
kudlatykaskader 0:e2da1a4652f5 365 _spi.write(0x87); // crc
kudlatykaskader 0:e2da1a4652f5 366
kudlatykaskader 0:e2da1a4652f5 367 // wait for the repsonse (response[7] == 0)
kudlatykaskader 0:e2da1a4652f5 368 for (int i = 0; i < SD_COMMAND_TIMEOUT * 1000; i++) {
kudlatykaskader 0:e2da1a4652f5 369 char response[5];
kudlatykaskader 0:e2da1a4652f5 370 response[0] = _spi.write(0xFF);
kudlatykaskader 0:e2da1a4652f5 371 if (!(response[0] & 0x80)) {
kudlatykaskader 0:e2da1a4652f5 372 for (int j = 1; j < 5; j++) {
kudlatykaskader 0:e2da1a4652f5 373 response[i] = _spi.write(0xFF);
kudlatykaskader 0:e2da1a4652f5 374 }
kudlatykaskader 0:e2da1a4652f5 375 _cs = 1;
kudlatykaskader 0:e2da1a4652f5 376 _spi.write(0xFF);
kudlatykaskader 0:e2da1a4652f5 377 return response[0];
kudlatykaskader 0:e2da1a4652f5 378 }
kudlatykaskader 0:e2da1a4652f5 379 }
kudlatykaskader 0:e2da1a4652f5 380 _cs = 1;
kudlatykaskader 0:e2da1a4652f5 381 _spi.write(0xFF);
kudlatykaskader 0:e2da1a4652f5 382 return -1; // timeout
kudlatykaskader 0:e2da1a4652f5 383 }
kudlatykaskader 0:e2da1a4652f5 384
kudlatykaskader 0:e2da1a4652f5 385 int SDFileSystem::_read(uint8_t *buffer, uint32_t length) {
kudlatykaskader 0:e2da1a4652f5 386 _cs = 0;
kudlatykaskader 0:e2da1a4652f5 387
kudlatykaskader 0:e2da1a4652f5 388 // read until start byte (0xFF)
kudlatykaskader 0:e2da1a4652f5 389 while (_spi.write(0xFF) != 0xFE);
kudlatykaskader 0:e2da1a4652f5 390
kudlatykaskader 0:e2da1a4652f5 391 // read data
kudlatykaskader 0:e2da1a4652f5 392 for (uint32_t i = 0; i < length; i++) {
kudlatykaskader 0:e2da1a4652f5 393 buffer[i] = _spi.write(0xFF);
kudlatykaskader 0:e2da1a4652f5 394 }
kudlatykaskader 0:e2da1a4652f5 395 _spi.write(0xFF); // checksum
kudlatykaskader 0:e2da1a4652f5 396 _spi.write(0xFF);
kudlatykaskader 0:e2da1a4652f5 397
kudlatykaskader 0:e2da1a4652f5 398 _cs = 1;
kudlatykaskader 0:e2da1a4652f5 399 _spi.write(0xFF);
kudlatykaskader 0:e2da1a4652f5 400 return 0;
kudlatykaskader 0:e2da1a4652f5 401 }
kudlatykaskader 0:e2da1a4652f5 402
kudlatykaskader 0:e2da1a4652f5 403 int SDFileSystem::_write(const uint8_t*buffer, uint32_t length) {
kudlatykaskader 0:e2da1a4652f5 404 _cs = 0;
kudlatykaskader 0:e2da1a4652f5 405
kudlatykaskader 0:e2da1a4652f5 406 // indicate start of block
kudlatykaskader 0:e2da1a4652f5 407 _spi.write(0xFE);
kudlatykaskader 0:e2da1a4652f5 408
kudlatykaskader 0:e2da1a4652f5 409 // write the data
kudlatykaskader 0:e2da1a4652f5 410 for (uint32_t i = 0; i < length; i++) {
kudlatykaskader 0:e2da1a4652f5 411 _spi.write(buffer[i]);
kudlatykaskader 0:e2da1a4652f5 412 }
kudlatykaskader 0:e2da1a4652f5 413
kudlatykaskader 0:e2da1a4652f5 414 // write the checksum
kudlatykaskader 0:e2da1a4652f5 415 _spi.write(0xFF);
kudlatykaskader 0:e2da1a4652f5 416 _spi.write(0xFF);
kudlatykaskader 0:e2da1a4652f5 417
kudlatykaskader 0:e2da1a4652f5 418 // check the response token
kudlatykaskader 0:e2da1a4652f5 419 if ((_spi.write(0xFF) & 0x1F) != 0x05) {
kudlatykaskader 0:e2da1a4652f5 420 _cs = 1;
kudlatykaskader 0:e2da1a4652f5 421 _spi.write(0xFF);
kudlatykaskader 0:e2da1a4652f5 422 return 1;
kudlatykaskader 0:e2da1a4652f5 423 }
kudlatykaskader 0:e2da1a4652f5 424
kudlatykaskader 0:e2da1a4652f5 425 // wait for write to finish
kudlatykaskader 0:e2da1a4652f5 426 while (_spi.write(0xFF) == 0);
kudlatykaskader 0:e2da1a4652f5 427
kudlatykaskader 0:e2da1a4652f5 428 _cs = 1;
kudlatykaskader 0:e2da1a4652f5 429 _spi.write(0xFF);
kudlatykaskader 0:e2da1a4652f5 430 return 0;
kudlatykaskader 0:e2da1a4652f5 431 }
kudlatykaskader 0:e2da1a4652f5 432
kudlatykaskader 0:e2da1a4652f5 433 static uint32_t ext_bits(unsigned char *data, int msb, int lsb) {
kudlatykaskader 0:e2da1a4652f5 434 uint32_t bits = 0;
kudlatykaskader 0:e2da1a4652f5 435 uint32_t size = 1 + msb - lsb;
kudlatykaskader 0:e2da1a4652f5 436 for (uint32_t i = 0; i < size; i++) {
kudlatykaskader 0:e2da1a4652f5 437 uint32_t position = lsb + i;
kudlatykaskader 0:e2da1a4652f5 438 uint32_t byte = 15 - (position >> 3);
kudlatykaskader 0:e2da1a4652f5 439 uint32_t bit = position & 0x7;
kudlatykaskader 0:e2da1a4652f5 440 uint32_t value = (data[byte] >> bit) & 1;
kudlatykaskader 0:e2da1a4652f5 441 bits |= value << i;
kudlatykaskader 0:e2da1a4652f5 442 }
kudlatykaskader 0:e2da1a4652f5 443 return bits;
kudlatykaskader 0:e2da1a4652f5 444 }
kudlatykaskader 0:e2da1a4652f5 445
kudlatykaskader 0:e2da1a4652f5 446 uint32_t SDFileSystem::_sd_sectors() {
kudlatykaskader 0:e2da1a4652f5 447 uint32_t c_size, c_size_mult, read_bl_len;
kudlatykaskader 0:e2da1a4652f5 448 uint32_t block_len, mult, blocknr, capacity;
kudlatykaskader 0:e2da1a4652f5 449 uint32_t hc_c_size;
kudlatykaskader 0:e2da1a4652f5 450 uint32_t blocks;
kudlatykaskader 0:e2da1a4652f5 451
kudlatykaskader 0:e2da1a4652f5 452 // CMD9, Response R2 (R1 byte + 16-byte block read)
kudlatykaskader 0:e2da1a4652f5 453 if (_cmdx(9, 0) != 0) {
kudlatykaskader 0:e2da1a4652f5 454 debug("Didn't get a response from the disk\n");
kudlatykaskader 0:e2da1a4652f5 455 return 0;
kudlatykaskader 0:e2da1a4652f5 456 }
kudlatykaskader 0:e2da1a4652f5 457
kudlatykaskader 0:e2da1a4652f5 458 uint8_t csd[16];
kudlatykaskader 0:e2da1a4652f5 459 if (_read(csd, 16) != 0) {
kudlatykaskader 0:e2da1a4652f5 460 debug("Couldn't read csd response from disk\n");
kudlatykaskader 0:e2da1a4652f5 461 return 0;
kudlatykaskader 0:e2da1a4652f5 462 }
kudlatykaskader 0:e2da1a4652f5 463
kudlatykaskader 0:e2da1a4652f5 464 // csd_structure : csd[127:126]
kudlatykaskader 0:e2da1a4652f5 465 // c_size : csd[73:62]
kudlatykaskader 0:e2da1a4652f5 466 // c_size_mult : csd[49:47]
kudlatykaskader 0:e2da1a4652f5 467 // read_bl_len : csd[83:80] - the *maximum* read block length
kudlatykaskader 0:e2da1a4652f5 468
kudlatykaskader 0:e2da1a4652f5 469 int csd_structure = ext_bits(csd, 127, 126);
kudlatykaskader 0:e2da1a4652f5 470
kudlatykaskader 0:e2da1a4652f5 471 switch (csd_structure) {
kudlatykaskader 0:e2da1a4652f5 472 case 0:
kudlatykaskader 0:e2da1a4652f5 473 cdv = 512;
kudlatykaskader 0:e2da1a4652f5 474 c_size = ext_bits(csd, 73, 62);
kudlatykaskader 0:e2da1a4652f5 475 c_size_mult = ext_bits(csd, 49, 47);
kudlatykaskader 0:e2da1a4652f5 476 read_bl_len = ext_bits(csd, 83, 80);
kudlatykaskader 0:e2da1a4652f5 477
kudlatykaskader 0:e2da1a4652f5 478 block_len = 1 << read_bl_len;
kudlatykaskader 0:e2da1a4652f5 479 mult = 1 << (c_size_mult + 2);
kudlatykaskader 0:e2da1a4652f5 480 blocknr = (c_size + 1) * mult;
kudlatykaskader 0:e2da1a4652f5 481 capacity = blocknr * block_len;
kudlatykaskader 0:e2da1a4652f5 482 blocks = capacity / 512;
kudlatykaskader 0:e2da1a4652f5 483 debug_if(SD_DBG, "\n\rSDCard\n\rc_size: %d \n\rcapacity: %ld \n\rsectors: %lld\n\r", c_size, capacity, blocks);
kudlatykaskader 0:e2da1a4652f5 484 break;
kudlatykaskader 0:e2da1a4652f5 485
kudlatykaskader 0:e2da1a4652f5 486 case 1:
kudlatykaskader 0:e2da1a4652f5 487 cdv = 1;
kudlatykaskader 0:e2da1a4652f5 488 hc_c_size = ext_bits(csd, 63, 48);
kudlatykaskader 0:e2da1a4652f5 489 blocks = (hc_c_size+1)*1024;
kudlatykaskader 0:e2da1a4652f5 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);
kudlatykaskader 0:e2da1a4652f5 491 break;
kudlatykaskader 0:e2da1a4652f5 492
kudlatykaskader 0:e2da1a4652f5 493 default:
kudlatykaskader 0:e2da1a4652f5 494 debug("CSD struct unsupported\r\n");
kudlatykaskader 0:e2da1a4652f5 495 return 0;
kudlatykaskader 0:e2da1a4652f5 496 };
kudlatykaskader 0:e2da1a4652f5 497 return blocks;
kudlatykaskader 0:e2da1a4652f5 498 }