Shinichiro Nakamura / SDHCFileSystem

Local copy of the SDHCFileSystem. But changed the I/O frequency to 20MHz.

Dependents:   SimpleWaveRecorderPlayer Application-SimpleWaveRecorderPlayerGenerator

SDHCFileSystem.cpp@0:5afeb866dfef, 2012-04-14 (annotated)

Committer:
shintamainjp
Date:
Sat Apr 14 02:22:19 2012 +0000
Revision:
0:5afeb866dfef
Initial version.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
shintamainjp 0:5afeb866dfef 1 /* mbed SDFileSystem Library, for providing file access to SD cards
shintamainjp 0:5afeb866dfef 2 * Copyright (c) 2008-2010, sford
shintamainjp 0:5afeb866dfef 3 *
shintamainjp 0:5afeb866dfef 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
shintamainjp 0:5afeb866dfef 5 * of this software and associated documentation files (the "Software"), to deal
shintamainjp 0:5afeb866dfef 6 * in the Software without restriction, including without limitation the rights
shintamainjp 0:5afeb866dfef 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
shintamainjp 0:5afeb866dfef 8 * copies of the Software, and to permit persons to whom the Software is
shintamainjp 0:5afeb866dfef 9 * furnished to do so, subject to the following conditions:
shintamainjp 0:5afeb866dfef 10 *
shintamainjp 0:5afeb866dfef 11 * The above copyright notice and this permission notice shall be included in
shintamainjp 0:5afeb866dfef 12 * all copies or substantial portions of the Software.
shintamainjp 0:5afeb866dfef 13 *
shintamainjp 0:5afeb866dfef 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
shintamainjp 0:5afeb866dfef 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
shintamainjp 0:5afeb866dfef 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
shintamainjp 0:5afeb866dfef 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
shintamainjp 0:5afeb866dfef 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
shintamainjp 0:5afeb866dfef 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
shintamainjp 0:5afeb866dfef 20 * THE SOFTWARE.
shintamainjp 0:5afeb866dfef 21 */
shintamainjp 0:5afeb866dfef 22
shintamainjp 0:5afeb866dfef 23 /* Introduction
shintamainjp 0:5afeb866dfef 24 * ------------
shintamainjp 0:5afeb866dfef 25 * SD and MMC cards support a number of interfaces, but common to them all
shintamainjp 0:5afeb866dfef 26 * is one based on SPI. This is the one I'm implmenting because it means
shintamainjp 0:5afeb866dfef 27 * it is much more portable even though not so performant, and we already
shintamainjp 0:5afeb866dfef 28 * have the mbed SPI Interface!
shintamainjp 0:5afeb866dfef 29 *
shintamainjp 0:5afeb866dfef 30 * The main reference I'm using is Chapter 7, "SPI Mode" of:
shintamainjp 0:5afeb866dfef 31 * http://www.sdcard.org/developers/tech/sdcard/pls/Simplified_Physical_Layer_Spec.pdf
shintamainjp 0:5afeb866dfef 32 *
shintamainjp 0:5afeb866dfef 33 * SPI Startup
shintamainjp 0:5afeb866dfef 34 * -----------
shintamainjp 0:5afeb866dfef 35 * The SD card powers up in SD mode. The SPI interface mode is selected by
shintamainjp 0:5afeb866dfef 36 * asserting CS low and sending the reset command (CMD0). The card will
shintamainjp 0:5afeb866dfef 37 * respond with a (R1) response.
shintamainjp 0:5afeb866dfef 38 *
shintamainjp 0:5afeb866dfef 39 * CMD8 is optionally sent to determine the voltage range supported, and
shintamainjp 0:5afeb866dfef 40 * indirectly determine whether it is a version 1.x SD/non-SD card or
shintamainjp 0:5afeb866dfef 41 * version 2.x. I'll just ignore this for now.
shintamainjp 0:5afeb866dfef 42 *
shintamainjp 0:5afeb866dfef 43 * ACMD41 is repeatedly issued to initialise the card, until "in idle"
shintamainjp 0:5afeb866dfef 44 * (bit 0) of the R1 response goes to '0', indicating it is initialised.
shintamainjp 0:5afeb866dfef 45 *
shintamainjp 0:5afeb866dfef 46 * You should also indicate whether the host supports High Capicity cards,
shintamainjp 0:5afeb866dfef 47 * and check whether the card is high capacity - i'll also ignore this
shintamainjp 0:5afeb866dfef 48 *
shintamainjp 0:5afeb866dfef 49 * SPI Protocol
shintamainjp 0:5afeb866dfef 50 * ------------
shintamainjp 0:5afeb866dfef 51 * The SD SPI protocol is based on transactions made up of 8-bit words, with
shintamainjp 0:5afeb866dfef 52 * the host starting every bus transaction by asserting the CS signal low. The
shintamainjp 0:5afeb866dfef 53 * card always responds to commands, data blocks and errors.
shintamainjp 0:5afeb866dfef 54 *
shintamainjp 0:5afeb866dfef 55 * The protocol supports a CRC, but by default it is off (except for the
shintamainjp 0:5afeb866dfef 56 * first reset CMD0, where the CRC can just be pre-calculated, and CMD8)
shintamainjp 0:5afeb866dfef 57 * I'll leave the CRC off I think!
shintamainjp 0:5afeb866dfef 58 *
shintamainjp 0:5afeb866dfef 59 * Standard capacity cards have variable data block sizes, whereas High
shintamainjp 0:5afeb866dfef 60 * Capacity cards fix the size of data block to 512 bytes. I'll therefore
shintamainjp 0:5afeb866dfef 61 * just always use the Standard Capacity cards with a block size of 512 bytes.
shintamainjp 0:5afeb866dfef 62 * This is set with CMD16.
shintamainjp 0:5afeb866dfef 63 *
shintamainjp 0:5afeb866dfef 64 * You can read and write single blocks (CMD17, CMD25) or multiple blocks
shintamainjp 0:5afeb866dfef 65 * (CMD18, CMD25). For simplicity, I'll just use single block accesses. When
shintamainjp 0:5afeb866dfef 66 * the card gets a read command, it responds with a response token, and then
shintamainjp 0:5afeb866dfef 67 * a data token or an error.
shintamainjp 0:5afeb866dfef 68 *
shintamainjp 0:5afeb866dfef 69 * SPI Command Format
shintamainjp 0:5afeb866dfef 70 * ------------------
shintamainjp 0:5afeb866dfef 71 * Commands are 6-bytes long, containing the command, 32-bit argument, and CRC.
shintamainjp 0:5afeb866dfef 72 *
shintamainjp 0:5afeb866dfef 73 * +---------------+------------+------------+-----------+----------+--------------+
shintamainjp 0:5afeb866dfef 74 * | 01 | cmd[5:0] | arg[31:24] | arg[23:16] | arg[15:8] | arg[7:0] | crc[6:0] | 1 |
shintamainjp 0:5afeb866dfef 75 * +---------------+------------+------------+-----------+----------+--------------+
shintamainjp 0:5afeb866dfef 76 *
shintamainjp 0:5afeb866dfef 77 * As I'm not using CRC, I can fix that byte to what is needed for CMD0 (0x95)
shintamainjp 0:5afeb866dfef 78 *
shintamainjp 0:5afeb866dfef 79 * All Application Specific commands shall be preceded with APP_CMD (CMD55).
shintamainjp 0:5afeb866dfef 80 *
shintamainjp 0:5afeb866dfef 81 * SPI Response Format
shintamainjp 0:5afeb866dfef 82 * -------------------
shintamainjp 0:5afeb866dfef 83 * The main response format (R1) is a status byte (normally zero). Key flags:
shintamainjp 0:5afeb866dfef 84 * idle - 1 if the card is in an idle state/initialising
shintamainjp 0:5afeb866dfef 85 * cmd - 1 if an illegal command code was detected
shintamainjp 0:5afeb866dfef 86 *
shintamainjp 0:5afeb866dfef 87 * +-------------------------------------------------+
shintamainjp 0:5afeb866dfef 88 * R1 | 0 | arg | addr | seq | crc | cmd | erase | idle |
shintamainjp 0:5afeb866dfef 89 * +-------------------------------------------------+
shintamainjp 0:5afeb866dfef 90 *
shintamainjp 0:5afeb866dfef 91 * R1b is the same, except it is followed by a busy signal (zeros) until
shintamainjp 0:5afeb866dfef 92 * the first non-zero byte when it is ready again.
shintamainjp 0:5afeb866dfef 93 *
shintamainjp 0:5afeb866dfef 94 * Data Response Token
shintamainjp 0:5afeb866dfef 95 * -------------------
shintamainjp 0:5afeb866dfef 96 * Every data block written to the card is acknowledged by a byte
shintamainjp 0:5afeb866dfef 97 * response token
shintamainjp 0:5afeb866dfef 98 *
shintamainjp 0:5afeb866dfef 99 * +----------------------+
shintamainjp 0:5afeb866dfef 100 * | xxx | 0 | status | 1 |
shintamainjp 0:5afeb866dfef 101 * +----------------------+
shintamainjp 0:5afeb866dfef 102 * 010 - OK!
shintamainjp 0:5afeb866dfef 103 * 101 - CRC Error
shintamainjp 0:5afeb866dfef 104 * 110 - Write Error
shintamainjp 0:5afeb866dfef 105 *
shintamainjp 0:5afeb866dfef 106 * Single Block Read and Write
shintamainjp 0:5afeb866dfef 107 * ---------------------------
shintamainjp 0:5afeb866dfef 108 *
shintamainjp 0:5afeb866dfef 109 * Block transfers have a byte header, followed by the data, followed
shintamainjp 0:5afeb866dfef 110 * by a 16-bit CRC. In our case, the data will always be 512 bytes.
shintamainjp 0:5afeb866dfef 111 *
shintamainjp 0:5afeb866dfef 112 * +------+---------+---------+- - - -+---------+-----------+----------+
shintamainjp 0:5afeb866dfef 113 * | 0xFE | data[0] | data[1] | | data[n] | crc[15:8] | crc[7:0] |
shintamainjp 0:5afeb866dfef 114 * +------+---------+---------+- - - -+---------+-----------+----------+
shintamainjp 0:5afeb866dfef 115 */
shintamainjp 0:5afeb866dfef 116
shintamainjp 0:5afeb866dfef 117 /*
shintamainjp 0:5afeb866dfef 118 * Comment: Changes for SDHC support till 32GB
shintamainjp 0:5afeb866dfef 119 * Name: KB
shintamainjp 0:5afeb866dfef 120 * Date: 07/24/2010
shintamainjp 0:5afeb866dfef 121 * Release: 0.1
shintamainjp 0:5afeb866dfef 122 */
shintamainjp 0:5afeb866dfef 123
shintamainjp 0:5afeb866dfef 124 /*
shintamainjp 0:5afeb866dfef 125 * Comment: Fixing compiler warnings, turning off DEBUG define
shintamainjp 0:5afeb866dfef 126 * Name: davervw
shintamainjp 0:5afeb866dfef 127 * Date: 02/26/2011
shintamainjp 0:5afeb866dfef 128 */
shintamainjp 0:5afeb866dfef 129
shintamainjp 0:5afeb866dfef 130 #include "SDHCFileSystem.h"
shintamainjp 0:5afeb866dfef 131
shintamainjp 0:5afeb866dfef 132 //#define DEBUG
shintamainjp 0:5afeb866dfef 133 #define SD_COMMAND_TIMEOUT 5000
shintamainjp 0:5afeb866dfef 134
shintamainjp 0:5afeb866dfef 135
shintamainjp 0:5afeb866dfef 136 SDFileSystem::SDFileSystem(PinName mosi, PinName miso, PinName sclk, PinName cs, const char* name) :
shintamainjp 0:5afeb866dfef 137 FATFileSystem(name), _spi(mosi, miso, sclk), _cs(cs) {
shintamainjp 0:5afeb866dfef 138 _cs = 1;
shintamainjp 0:5afeb866dfef 139 }
shintamainjp 0:5afeb866dfef 140
shintamainjp 0:5afeb866dfef 141 #define R1_IDLE_STATE (1 << 0)
shintamainjp 0:5afeb866dfef 142 #define R1_ERASE_RESET (1 << 1)
shintamainjp 0:5afeb866dfef 143 #define R1_ILLEGAL_COMMAND (1 << 2)
shintamainjp 0:5afeb866dfef 144 #define R1_COM_CRC_ERROR (1 << 3)
shintamainjp 0:5afeb866dfef 145 #define R1_ERASE_SEQUENCE_ERROR (1 << 4)
shintamainjp 0:5afeb866dfef 146 #define R1_ADDRESS_ERROR (1 << 5)
shintamainjp 0:5afeb866dfef 147 #define R1_PARAMETER_ERROR (1 << 6)
shintamainjp 0:5afeb866dfef 148
shintamainjp 0:5afeb866dfef 149 // Types
shintamainjp 0:5afeb866dfef 150 // - v1.x Standard Capacity
shintamainjp 0:5afeb866dfef 151 // - v2.x Standard Capacity
shintamainjp 0:5afeb866dfef 152 // - v2.x High Capacity
shintamainjp 0:5afeb866dfef 153 // - Not recognised as an SD Card
shintamainjp 0:5afeb866dfef 154
shintamainjp 0:5afeb866dfef 155 #define SDCARD_FAIL 0
shintamainjp 0:5afeb866dfef 156 #define SDCARD_V1 1
shintamainjp 0:5afeb866dfef 157 #define SDCARD_V2 2
shintamainjp 0:5afeb866dfef 158 #define SDCARD_V2HC 3
shintamainjp 0:5afeb866dfef 159
shintamainjp 0:5afeb866dfef 160 int SDFileSystem::initialise_card() {
shintamainjp 0:5afeb866dfef 161 // Set to 100kHz for initialisation, and clock card with cs = 1
shintamainjp 0:5afeb866dfef 162 _spi.frequency(100000);
shintamainjp 0:5afeb866dfef 163 _cs = 1;
shintamainjp 0:5afeb866dfef 164 for(int i=0; i<16; i++) {
shintamainjp 0:5afeb866dfef 165 _spi.write(0xFF);
shintamainjp 0:5afeb866dfef 166 }
shintamainjp 0:5afeb866dfef 167
shintamainjp 0:5afeb866dfef 168 // send CMD0, should return with all zeros except IDLE STATE set (bit 0)
shintamainjp 0:5afeb866dfef 169 if(_cmd(0, 0) != R1_IDLE_STATE) {
shintamainjp 0:5afeb866dfef 170 fprintf(stderr, "No disk, or could not put SD card in to SPI idle state\n");
shintamainjp 0:5afeb866dfef 171 return SDCARD_FAIL;
shintamainjp 0:5afeb866dfef 172 }
shintamainjp 0:5afeb866dfef 173
shintamainjp 0:5afeb866dfef 174 // send CMD8 to determine whther it is ver 2.x
shintamainjp 0:5afeb866dfef 175 int r = _cmd8();
shintamainjp 0:5afeb866dfef 176 if(r == R1_IDLE_STATE) {
shintamainjp 0:5afeb866dfef 177 return initialise_card_v2();
shintamainjp 0:5afeb866dfef 178 } else if(r == (R1_IDLE_STATE | R1_ILLEGAL_COMMAND)) {
shintamainjp 0:5afeb866dfef 179 return initialise_card_v1();
shintamainjp 0:5afeb866dfef 180 } else {
shintamainjp 0:5afeb866dfef 181 fprintf(stderr, "Not in idle state after sending CMD8 (not an SD card?)\n");
shintamainjp 0:5afeb866dfef 182 return SDCARD_FAIL;
shintamainjp 0:5afeb866dfef 183 }
shintamainjp 0:5afeb866dfef 184 }
shintamainjp 0:5afeb866dfef 185
shintamainjp 0:5afeb866dfef 186 int SDFileSystem::initialise_card_v1() {
shintamainjp 0:5afeb866dfef 187 for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
shintamainjp 0:5afeb866dfef 188 _cmd(55, 0);
shintamainjp 0:5afeb866dfef 189 if(_cmd(41, 0) == 0) {
shintamainjp 0:5afeb866dfef 190 cdv = 512;
shintamainjp 0:5afeb866dfef 191 #ifdef DEBUG
shintamainjp 0:5afeb866dfef 192 printf("\n\rInit: SEDCARD_V1\n\r");
shintamainjp 0:5afeb866dfef 193 #endif
shintamainjp 0:5afeb866dfef 194 return SDCARD_V1;
shintamainjp 0:5afeb866dfef 195 }
shintamainjp 0:5afeb866dfef 196 }
shintamainjp 0:5afeb866dfef 197
shintamainjp 0:5afeb866dfef 198 fprintf(stderr, "Timeout waiting for v1.x card\n");
shintamainjp 0:5afeb866dfef 199 return SDCARD_FAIL;
shintamainjp 0:5afeb866dfef 200 }
shintamainjp 0:5afeb866dfef 201
shintamainjp 0:5afeb866dfef 202 int SDFileSystem::initialise_card_v2() {
shintamainjp 0:5afeb866dfef 203
shintamainjp 0:5afeb866dfef 204 for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
shintamainjp 0:5afeb866dfef 205 wait_ms(50);
shintamainjp 0:5afeb866dfef 206 _cmd58();
shintamainjp 0:5afeb866dfef 207 _cmd(55, 0);
shintamainjp 0:5afeb866dfef 208 if(_cmd(41, 0x40000000) == 0) {
shintamainjp 0:5afeb866dfef 209 _cmd58();
shintamainjp 0:5afeb866dfef 210 #ifdef DEBUG
shintamainjp 0:5afeb866dfef 211 printf("\n\rInit: SDCARD_V2\n\r");
shintamainjp 0:5afeb866dfef 212 #endif
shintamainjp 0:5afeb866dfef 213 cdv = 1;
shintamainjp 0:5afeb866dfef 214 return SDCARD_V2;
shintamainjp 0:5afeb866dfef 215 }
shintamainjp 0:5afeb866dfef 216 }
shintamainjp 0:5afeb866dfef 217
shintamainjp 0:5afeb866dfef 218 fprintf(stderr, "Timeout waiting for v2.x card\n");
shintamainjp 0:5afeb866dfef 219 return SDCARD_FAIL;
shintamainjp 0:5afeb866dfef 220 }
shintamainjp 0:5afeb866dfef 221
shintamainjp 0:5afeb866dfef 222 int SDFileSystem::disk_initialize() {
shintamainjp 0:5afeb866dfef 223
shintamainjp 0:5afeb866dfef 224 int i = initialise_card();
shintamainjp 0:5afeb866dfef 225 #ifdef DEBUG
shintamainjp 0:5afeb866dfef 226 printf("init card = %d\n", i);
shintamainjp 0:5afeb866dfef 227 #endif
shintamainjp 0:5afeb866dfef 228 _sectors = _sd_sectors();
shintamainjp 0:5afeb866dfef 229
shintamainjp 0:5afeb866dfef 230 // Set block length to 512 (CMD16)
shintamainjp 0:5afeb866dfef 231 if(_cmd(16, 512) != 0) {
shintamainjp 0:5afeb866dfef 232 fprintf(stderr, "Set 512-byte block timed out\n");
shintamainjp 0:5afeb866dfef 233 return 1;
shintamainjp 0:5afeb866dfef 234 }
shintamainjp 0:5afeb866dfef 235
shintamainjp 0:5afeb866dfef 236 _spi.frequency(20000000); // Set to 20MHz for data transfer
shintamainjp 0:5afeb866dfef 237 return 0;
shintamainjp 0:5afeb866dfef 238 }
shintamainjp 0:5afeb866dfef 239
shintamainjp 0:5afeb866dfef 240 int SDFileSystem::disk_write(const char *buffer, int block_number) {
shintamainjp 0:5afeb866dfef 241 // set write address for single block (CMD24)
shintamainjp 0:5afeb866dfef 242 if(_cmd(24, block_number * cdv) != 0) {
shintamainjp 0:5afeb866dfef 243 return 1;
shintamainjp 0:5afeb866dfef 244 }
shintamainjp 0:5afeb866dfef 245
shintamainjp 0:5afeb866dfef 246 // send the data block
shintamainjp 0:5afeb866dfef 247 _write(buffer, 512);
shintamainjp 0:5afeb866dfef 248 return 0;
shintamainjp 0:5afeb866dfef 249 }
shintamainjp 0:5afeb866dfef 250
shintamainjp 0:5afeb866dfef 251 int SDFileSystem::disk_read(char *buffer, int block_number) {
shintamainjp 0:5afeb866dfef 252 // set read address for single block (CMD17)
shintamainjp 0:5afeb866dfef 253 if(_cmd(17, block_number * cdv) != 0) {
shintamainjp 0:5afeb866dfef 254 return 1;
shintamainjp 0:5afeb866dfef 255 }
shintamainjp 0:5afeb866dfef 256
shintamainjp 0:5afeb866dfef 257 // receive the data
shintamainjp 0:5afeb866dfef 258 _read(buffer, 512);
shintamainjp 0:5afeb866dfef 259 return 0;
shintamainjp 0:5afeb866dfef 260 }
shintamainjp 0:5afeb866dfef 261
shintamainjp 0:5afeb866dfef 262 int SDFileSystem::disk_status() { return 0; }
shintamainjp 0:5afeb866dfef 263 int SDFileSystem::disk_sync() { return 0; }
shintamainjp 0:5afeb866dfef 264 int SDFileSystem::disk_sectors() { return _sectors; }
shintamainjp 0:5afeb866dfef 265
shintamainjp 0:5afeb866dfef 266 // PRIVATE FUNCTIONS
shintamainjp 0:5afeb866dfef 267
shintamainjp 0:5afeb866dfef 268 int SDFileSystem::_cmd(int cmd, int arg) {
shintamainjp 0:5afeb866dfef 269 _cs = 0;
shintamainjp 0:5afeb866dfef 270
shintamainjp 0:5afeb866dfef 271 // send a command
shintamainjp 0:5afeb866dfef 272 _spi.write(0x40 | cmd);
shintamainjp 0:5afeb866dfef 273 _spi.write(arg >> 24);
shintamainjp 0:5afeb866dfef 274 _spi.write(arg >> 16);
shintamainjp 0:5afeb866dfef 275 _spi.write(arg >> 8);
shintamainjp 0:5afeb866dfef 276 _spi.write(arg >> 0);
shintamainjp 0:5afeb866dfef 277 _spi.write(0x95);
shintamainjp 0:5afeb866dfef 278
shintamainjp 0:5afeb866dfef 279 // wait for the repsonse (response[7] == 0)
shintamainjp 0:5afeb866dfef 280 for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
shintamainjp 0:5afeb866dfef 281 int response = _spi.write(0xFF);
shintamainjp 0:5afeb866dfef 282 if(!(response & 0x80)) {
shintamainjp 0:5afeb866dfef 283 _cs = 1;
shintamainjp 0:5afeb866dfef 284 _spi.write(0xFF);
shintamainjp 0:5afeb866dfef 285 return response;
shintamainjp 0:5afeb866dfef 286 }
shintamainjp 0:5afeb866dfef 287 }
shintamainjp 0:5afeb866dfef 288 _cs = 1;
shintamainjp 0:5afeb866dfef 289 _spi.write(0xFF);
shintamainjp 0:5afeb866dfef 290 return -1; // timeout
shintamainjp 0:5afeb866dfef 291 }
shintamainjp 0:5afeb866dfef 292 int SDFileSystem::_cmdx(int cmd, int arg) {
shintamainjp 0:5afeb866dfef 293 _cs = 0;
shintamainjp 0:5afeb866dfef 294
shintamainjp 0:5afeb866dfef 295 // send a command
shintamainjp 0:5afeb866dfef 296 _spi.write(0x40 | cmd);
shintamainjp 0:5afeb866dfef 297 _spi.write(arg >> 24);
shintamainjp 0:5afeb866dfef 298 _spi.write(arg >> 16);
shintamainjp 0:5afeb866dfef 299 _spi.write(arg >> 8);
shintamainjp 0:5afeb866dfef 300 _spi.write(arg >> 0);
shintamainjp 0:5afeb866dfef 301 _spi.write(0x95);
shintamainjp 0:5afeb866dfef 302
shintamainjp 0:5afeb866dfef 303 // wait for the repsonse (response[7] == 0)
shintamainjp 0:5afeb866dfef 304 for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
shintamainjp 0:5afeb866dfef 305 int response = _spi.write(0xFF);
shintamainjp 0:5afeb866dfef 306 if(!(response & 0x80)) {
shintamainjp 0:5afeb866dfef 307 return response;
shintamainjp 0:5afeb866dfef 308 }
shintamainjp 0:5afeb866dfef 309 }
shintamainjp 0:5afeb866dfef 310 _cs = 1;
shintamainjp 0:5afeb866dfef 311 _spi.write(0xFF);
shintamainjp 0:5afeb866dfef 312 return -1; // timeout
shintamainjp 0:5afeb866dfef 313 }
shintamainjp 0:5afeb866dfef 314
shintamainjp 0:5afeb866dfef 315
shintamainjp 0:5afeb866dfef 316 int SDFileSystem::_cmd58() {
shintamainjp 0:5afeb866dfef 317 _cs = 0;
shintamainjp 0:5afeb866dfef 318 int arg = 0;
shintamainjp 0:5afeb866dfef 319
shintamainjp 0:5afeb866dfef 320 // send a command
shintamainjp 0:5afeb866dfef 321 _spi.write(0x40 | 58);
shintamainjp 0:5afeb866dfef 322 _spi.write(arg >> 24);
shintamainjp 0:5afeb866dfef 323 _spi.write(arg >> 16);
shintamainjp 0:5afeb866dfef 324 _spi.write(arg >> 8);
shintamainjp 0:5afeb866dfef 325 _spi.write(arg >> 0);
shintamainjp 0:5afeb866dfef 326 _spi.write(0x95);
shintamainjp 0:5afeb866dfef 327
shintamainjp 0:5afeb866dfef 328 // wait for the repsonse (response[7] == 0)
shintamainjp 0:5afeb866dfef 329 for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
shintamainjp 0:5afeb866dfef 330 int response = _spi.write(0xFF);
shintamainjp 0:5afeb866dfef 331 if(!(response & 0x80)) {
shintamainjp 0:5afeb866dfef 332 int ocr = _spi.write(0xFF) << 24;
shintamainjp 0:5afeb866dfef 333 ocr |= _spi.write(0xFF) << 16;
shintamainjp 0:5afeb866dfef 334 ocr |= _spi.write(0xFF) << 8;
shintamainjp 0:5afeb866dfef 335 ocr |= _spi.write(0xFF) << 0;
shintamainjp 0:5afeb866dfef 336 // printf("OCR = 0x%08X\n", ocr);
shintamainjp 0:5afeb866dfef 337 _cs = 1;
shintamainjp 0:5afeb866dfef 338 _spi.write(0xFF);
shintamainjp 0:5afeb866dfef 339 return response;
shintamainjp 0:5afeb866dfef 340 }
shintamainjp 0:5afeb866dfef 341 }
shintamainjp 0:5afeb866dfef 342 _cs = 1;
shintamainjp 0:5afeb866dfef 343 _spi.write(0xFF);
shintamainjp 0:5afeb866dfef 344 return -1; // timeout
shintamainjp 0:5afeb866dfef 345 }
shintamainjp 0:5afeb866dfef 346
shintamainjp 0:5afeb866dfef 347 int SDFileSystem::_cmd8() {
shintamainjp 0:5afeb866dfef 348 _cs = 0;
shintamainjp 0:5afeb866dfef 349
shintamainjp 0:5afeb866dfef 350 // send a command
shintamainjp 0:5afeb866dfef 351 _spi.write(0x40 | 8); // CMD8
shintamainjp 0:5afeb866dfef 352 _spi.write(0x00); // reserved
shintamainjp 0:5afeb866dfef 353 _spi.write(0x00); // reserved
shintamainjp 0:5afeb866dfef 354 _spi.write(0x01); // 3.3v
shintamainjp 0:5afeb866dfef 355 _spi.write(0xAA); // check pattern
shintamainjp 0:5afeb866dfef 356 _spi.write(0x87); // crc
shintamainjp 0:5afeb866dfef 357
shintamainjp 0:5afeb866dfef 358 // wait for the repsonse (response[7] == 0)
shintamainjp 0:5afeb866dfef 359 for(int i=0; i<SD_COMMAND_TIMEOUT * 1000; i++) {
shintamainjp 0:5afeb866dfef 360 char response[5];
shintamainjp 0:5afeb866dfef 361 response[0] = _spi.write(0xFF);
shintamainjp 0:5afeb866dfef 362 if(!(response[0] & 0x80)) {
shintamainjp 0:5afeb866dfef 363 for(int j=1; j<5; j++) {
shintamainjp 0:5afeb866dfef 364 response[i] = _spi.write(0xFF);
shintamainjp 0:5afeb866dfef 365 }
shintamainjp 0:5afeb866dfef 366 _cs = 1;
shintamainjp 0:5afeb866dfef 367 _spi.write(0xFF);
shintamainjp 0:5afeb866dfef 368 return response[0];
shintamainjp 0:5afeb866dfef 369 }
shintamainjp 0:5afeb866dfef 370 }
shintamainjp 0:5afeb866dfef 371 _cs = 1;
shintamainjp 0:5afeb866dfef 372 _spi.write(0xFF);
shintamainjp 0:5afeb866dfef 373 return -1; // timeout
shintamainjp 0:5afeb866dfef 374 }
shintamainjp 0:5afeb866dfef 375
shintamainjp 0:5afeb866dfef 376 int SDFileSystem::_read(char *buffer, int length) {
shintamainjp 0:5afeb866dfef 377 _cs = 0;
shintamainjp 0:5afeb866dfef 378
shintamainjp 0:5afeb866dfef 379 // read until start byte (0xFF)
shintamainjp 0:5afeb866dfef 380 while(_spi.write(0xFF) != 0xFE);
shintamainjp 0:5afeb866dfef 381
shintamainjp 0:5afeb866dfef 382 // read data
shintamainjp 0:5afeb866dfef 383 for(int i=0; i<length; i++) {
shintamainjp 0:5afeb866dfef 384 buffer[i] = _spi.write(0xFF);
shintamainjp 0:5afeb866dfef 385 }
shintamainjp 0:5afeb866dfef 386 _spi.write(0xFF); // checksum
shintamainjp 0:5afeb866dfef 387 _spi.write(0xFF);
shintamainjp 0:5afeb866dfef 388
shintamainjp 0:5afeb866dfef 389 _cs = 1;
shintamainjp 0:5afeb866dfef 390 _spi.write(0xFF);
shintamainjp 0:5afeb866dfef 391 return 0;
shintamainjp 0:5afeb866dfef 392 }
shintamainjp 0:5afeb866dfef 393
shintamainjp 0:5afeb866dfef 394 int SDFileSystem::_write(const char *buffer, int length) {
shintamainjp 0:5afeb866dfef 395 _cs = 0;
shintamainjp 0:5afeb866dfef 396
shintamainjp 0:5afeb866dfef 397 // indicate start of block
shintamainjp 0:5afeb866dfef 398 _spi.write(0xFE);
shintamainjp 0:5afeb866dfef 399
shintamainjp 0:5afeb866dfef 400 // write the data
shintamainjp 0:5afeb866dfef 401 for(int i=0; i<length; i++) {
shintamainjp 0:5afeb866dfef 402 _spi.write(buffer[i]);
shintamainjp 0:5afeb866dfef 403 }
shintamainjp 0:5afeb866dfef 404
shintamainjp 0:5afeb866dfef 405 // write the checksum
shintamainjp 0:5afeb866dfef 406 _spi.write(0xFF);
shintamainjp 0:5afeb866dfef 407 _spi.write(0xFF);
shintamainjp 0:5afeb866dfef 408
shintamainjp 0:5afeb866dfef 409 // check the repsonse token
shintamainjp 0:5afeb866dfef 410 if((_spi.write(0xFF) & 0x1F) != 0x05) {
shintamainjp 0:5afeb866dfef 411 _cs = 1;
shintamainjp 0:5afeb866dfef 412 _spi.write(0xFF);
shintamainjp 0:5afeb866dfef 413 return 1;
shintamainjp 0:5afeb866dfef 414 }
shintamainjp 0:5afeb866dfef 415
shintamainjp 0:5afeb866dfef 416 // wait for write to finish
shintamainjp 0:5afeb866dfef 417 while(_spi.write(0xFF) == 0);
shintamainjp 0:5afeb866dfef 418
shintamainjp 0:5afeb866dfef 419 _cs = 1;
shintamainjp 0:5afeb866dfef 420 _spi.write(0xFF);
shintamainjp 0:5afeb866dfef 421 return 0;
shintamainjp 0:5afeb866dfef 422 }
shintamainjp 0:5afeb866dfef 423
shintamainjp 0:5afeb866dfef 424 static int ext_bits(char *data, int msb, int lsb) {
shintamainjp 0:5afeb866dfef 425 int bits = 0;
shintamainjp 0:5afeb866dfef 426 int size = 1 + msb - lsb;
shintamainjp 0:5afeb866dfef 427 for(int i=0; i<size; i++) {
shintamainjp 0:5afeb866dfef 428 int position = lsb + i;
shintamainjp 0:5afeb866dfef 429 int byte = 15 - (position >> 3);
shintamainjp 0:5afeb866dfef 430 int bit = position & 0x7;
shintamainjp 0:5afeb866dfef 431 int value = (data[byte] >> bit) & 1;
shintamainjp 0:5afeb866dfef 432 bits |= value << i;
shintamainjp 0:5afeb866dfef 433 }
shintamainjp 0:5afeb866dfef 434 return bits;
shintamainjp 0:5afeb866dfef 435 }
shintamainjp 0:5afeb866dfef 436
shintamainjp 0:5afeb866dfef 437 int SDFileSystem::_sd_sectors() {
shintamainjp 0:5afeb866dfef 438
shintamainjp 0:5afeb866dfef 439 int c_size, c_size_mult, read_bl_len;
shintamainjp 0:5afeb866dfef 440 int block_len, mult, blocknr, capacity;
shintamainjp 0:5afeb866dfef 441 int blocks, hc_c_size;
shintamainjp 0:5afeb866dfef 442
shintamainjp 0:5afeb866dfef 443 // CMD9, Response R2 (R1 byte + 16-byte block read)
shintamainjp 0:5afeb866dfef 444 if(_cmdx(9, 0) != 0) {
shintamainjp 0:5afeb866dfef 445 fprintf(stderr, "Didn't get a response from the disk\n");
shintamainjp 0:5afeb866dfef 446 return 0;
shintamainjp 0:5afeb866dfef 447 }
shintamainjp 0:5afeb866dfef 448
shintamainjp 0:5afeb866dfef 449 char csd[16];
shintamainjp 0:5afeb866dfef 450 if(_read(csd, 16) != 0) {
shintamainjp 0:5afeb866dfef 451 fprintf(stderr, "Couldn't read csd response from disk\n");
shintamainjp 0:5afeb866dfef 452 return 0;
shintamainjp 0:5afeb866dfef 453 }
shintamainjp 0:5afeb866dfef 454
shintamainjp 0:5afeb866dfef 455 // csd_structure : csd[127:126]
shintamainjp 0:5afeb866dfef 456 // c_size : csd[73:62]
shintamainjp 0:5afeb866dfef 457 // c_size_mult : csd[49:47]
shintamainjp 0:5afeb866dfef 458 // read_bl_len : csd[83:80] - the *maximum* read block length
shintamainjp 0:5afeb866dfef 459
shintamainjp 0:5afeb866dfef 460 int csd_structure = ext_bits(csd, 127, 126);
shintamainjp 0:5afeb866dfef 461
shintamainjp 0:5afeb866dfef 462 #ifdef DEBUG
shintamainjp 0:5afeb866dfef 463 printf("\n\rCSD_STRUCT = %d\n", csd_structure);
shintamainjp 0:5afeb866dfef 464 #endif
shintamainjp 0:5afeb866dfef 465
shintamainjp 0:5afeb866dfef 466 switch (csd_structure){
shintamainjp 0:5afeb866dfef 467 case 0:
shintamainjp 0:5afeb866dfef 468 cdv = 512;
shintamainjp 0:5afeb866dfef 469 c_size = ext_bits(csd, 73, 62);
shintamainjp 0:5afeb866dfef 470 c_size_mult = ext_bits(csd, 49, 47);
shintamainjp 0:5afeb866dfef 471 read_bl_len = ext_bits(csd, 83, 80);
shintamainjp 0:5afeb866dfef 472
shintamainjp 0:5afeb866dfef 473 block_len = 1 << read_bl_len;
shintamainjp 0:5afeb866dfef 474 mult = 1 << (c_size_mult + 2);
shintamainjp 0:5afeb866dfef 475 blocknr = (c_size + 1) * mult;
shintamainjp 0:5afeb866dfef 476 capacity = blocknr * block_len;
shintamainjp 0:5afeb866dfef 477 blocks = capacity / 512;
shintamainjp 0:5afeb866dfef 478 #ifdef DEBUG
shintamainjp 0:5afeb866dfef 479 printf("\n\rSDCard\n\rc_size: %.4X \n\rcapacity: %.ld \n\rsectors: %d\n\r", c_size, capacity, blocks);
shintamainjp 0:5afeb866dfef 480 #endif
shintamainjp 0:5afeb866dfef 481 break;
shintamainjp 0:5afeb866dfef 482
shintamainjp 0:5afeb866dfef 483 case 1:
shintamainjp 0:5afeb866dfef 484 {
shintamainjp 0:5afeb866dfef 485 cdv = 1;
shintamainjp 0:5afeb866dfef 486 hc_c_size = ext_bits(csd, 63, 48);
shintamainjp 0:5afeb866dfef 487 int hc_read_bl_len = ext_bits(csd, 83, 80);
shintamainjp 0:5afeb866dfef 488 blocks = (hc_c_size+1)*1024;
shintamainjp 0:5afeb866dfef 489 #ifdef DEBUG
shintamainjp 0:5afeb866dfef 490 uint64_t hc_capacity = hc_c_size+1;
shintamainjp 0:5afeb866dfef 491 printf("\n\rSDHC Card \n\rhc_c_size: %.4X \n\rcapacity: %.lld \n\rsectors: %d\n\r", hc_c_size, hc_capacity*512*1024, blocks);
shintamainjp 0:5afeb866dfef 492 #endif
shintamainjp 0:5afeb866dfef 493 break;
shintamainjp 0:5afeb866dfef 494 }
shintamainjp 0:5afeb866dfef 495
shintamainjp 0:5afeb866dfef 496 default:
shintamainjp 0:5afeb866dfef 497 fprintf(stderr, "This disk tastes funny! I only know about type 0 CSD structures\n");
shintamainjp 0:5afeb866dfef 498 return 0;
shintamainjp 0:5afeb866dfef 499 };
shintamainjp 0:5afeb866dfef 500 return blocks;
shintamainjp 0:5afeb866dfef 501 }