Masato YAMANISHI / Mbed 2 deprecated USBHostC210_example

modify for C210 webcam and Startboard Orange.

Dependencies:   TextLCD USBHost mbed

Fork of USBHostC270_example by Norimasa Okamoto

Norimasa Okamoto さんの http://mbed.org/users/va009039/code/USBHostC270_example/ を C210 webcam と StarBoard Orange での SD カード保存用に変更。

SDFileSystem.cpp@12:c827ed52021d, 2013-03-19 (annotated)

Committer:
masato
Date:
Tue Mar 19 14:16:25 2013 +0000
Revision:
12:c827ed52021d
for C210 and StartBoard Orange

Who changed what in which revision?

UserRevisionLine numberNew contents of line
masato 12:c827ed52021d 1 /* mbed Microcontroller Library
masato 12:c827ed52021d 2 * Copyright (c) 2006-2012 ARM Limited
masato 12:c827ed52021d 3 *
masato 12:c827ed52021d 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
masato 12:c827ed52021d 5 * of this software and associated documentation files (the "Software"), to deal
masato 12:c827ed52021d 6 * in the Software without restriction, including without limitation the rights
masato 12:c827ed52021d 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
masato 12:c827ed52021d 8 * copies of the Software, and to permit persons to whom the Software is
masato 12:c827ed52021d 9 * furnished to do so, subject to the following conditions:
masato 12:c827ed52021d 10 *
masato 12:c827ed52021d 11 * The above copyright notice and this permission notice shall be included in
masato 12:c827ed52021d 12 * all copies or substantial portions of the Software.
masato 12:c827ed52021d 13 *
masato 12:c827ed52021d 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
masato 12:c827ed52021d 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
masato 12:c827ed52021d 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
masato 12:c827ed52021d 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
masato 12:c827ed52021d 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
masato 12:c827ed52021d 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
masato 12:c827ed52021d 20 * SOFTWARE.
masato 12:c827ed52021d 21 */
masato 12:c827ed52021d 22 /* Introduction
masato 12:c827ed52021d 23 * ------------
masato 12:c827ed52021d 24 * SD and MMC cards support a number of interfaces, but common to them all
masato 12:c827ed52021d 25 * is one based on SPI. This is the one I'm implmenting because it means
masato 12:c827ed52021d 26 * it is much more portable even though not so performant, and we already
masato 12:c827ed52021d 27 * have the mbed SPI Interface!
masato 12:c827ed52021d 28 *
masato 12:c827ed52021d 29 * The main reference I'm using is Chapter 7, "SPI Mode" of:
masato 12:c827ed52021d 30 * http://www.sdcard.org/developers/tech/sdcard/pls/Simplified_Physical_Layer_Spec.pdf
masato 12:c827ed52021d 31 *
masato 12:c827ed52021d 32 * SPI Startup
masato 12:c827ed52021d 33 * -----------
masato 12:c827ed52021d 34 * The SD card powers up in SD mode. The SPI interface mode is selected by
masato 12:c827ed52021d 35 * asserting CS low and sending the reset command (CMD0). The card will
masato 12:c827ed52021d 36 * respond with a (R1) response.
masato 12:c827ed52021d 37 *
masato 12:c827ed52021d 38 * CMD8 is optionally sent to determine the voltage range supported, and
masato 12:c827ed52021d 39 * indirectly determine whether it is a version 1.x SD/non-SD card or
masato 12:c827ed52021d 40 * version 2.x. I'll just ignore this for now.
masato 12:c827ed52021d 41 *
masato 12:c827ed52021d 42 * ACMD41 is repeatedly issued to initialise the card, until "in idle"
masato 12:c827ed52021d 43 * (bit 0) of the R1 response goes to '0', indicating it is initialised.
masato 12:c827ed52021d 44 *
masato 12:c827ed52021d 45 * You should also indicate whether the host supports High Capicity cards,
masato 12:c827ed52021d 46 * and check whether the card is high capacity - i'll also ignore this
masato 12:c827ed52021d 47 *
masato 12:c827ed52021d 48 * SPI Protocol
masato 12:c827ed52021d 49 * ------------
masato 12:c827ed52021d 50 * The SD SPI protocol is based on transactions made up of 8-bit words, with
masato 12:c827ed52021d 51 * the host starting every bus transaction by asserting the CS signal low. The
masato 12:c827ed52021d 52 * card always responds to commands, data blocks and errors.
masato 12:c827ed52021d 53 *
masato 12:c827ed52021d 54 * The protocol supports a CRC, but by default it is off (except for the
masato 12:c827ed52021d 55 * first reset CMD0, where the CRC can just be pre-calculated, and CMD8)
masato 12:c827ed52021d 56 * I'll leave the CRC off I think!
masato 12:c827ed52021d 57 *
masato 12:c827ed52021d 58 * Standard capacity cards have variable data block sizes, whereas High
masato 12:c827ed52021d 59 * Capacity cards fix the size of data block to 512 bytes. I'll therefore
masato 12:c827ed52021d 60 * just always use the Standard Capacity cards with a block size of 512 bytes.
masato 12:c827ed52021d 61 * This is set with CMD16.
masato 12:c827ed52021d 62 *
masato 12:c827ed52021d 63 * You can read and write single blocks (CMD17, CMD25) or multiple blocks
masato 12:c827ed52021d 64 * (CMD18, CMD25). For simplicity, I'll just use single block accesses. When
masato 12:c827ed52021d 65 * the card gets a read command, it responds with a response token, and then
masato 12:c827ed52021d 66 * a data token or an error.
masato 12:c827ed52021d 67 *
masato 12:c827ed52021d 68 * SPI Command Format
masato 12:c827ed52021d 69 * ------------------
masato 12:c827ed52021d 70 * Commands are 6-bytes long, containing the command, 32-bit argument, and CRC.
masato 12:c827ed52021d 71 *
masato 12:c827ed52021d 72 * +---------------+------------+------------+-----------+----------+--------------+
masato 12:c827ed52021d 73 * | 01 | cmd[5:0] | arg[31:24] | arg[23:16] | arg[15:8] | arg[7:0] | crc[6:0] | 1 |
masato 12:c827ed52021d 74 * +---------------+------------+------------+-----------+----------+--------------+
masato 12:c827ed52021d 75 *
masato 12:c827ed52021d 76 * As I'm not using CRC, I can fix that byte to what is needed for CMD0 (0x95)
masato 12:c827ed52021d 77 *
masato 12:c827ed52021d 78 * All Application Specific commands shall be preceded with APP_CMD (CMD55).
masato 12:c827ed52021d 79 *
masato 12:c827ed52021d 80 * SPI Response Format
masato 12:c827ed52021d 81 * -------------------
masato 12:c827ed52021d 82 * The main response format (R1) is a status byte (normally zero). Key flags:
masato 12:c827ed52021d 83 * idle - 1 if the card is in an idle state/initialising
masato 12:c827ed52021d 84 * cmd - 1 if an illegal command code was detected
masato 12:c827ed52021d 85 *
masato 12:c827ed52021d 86 * +-------------------------------------------------+
masato 12:c827ed52021d 87 * R1 | 0 | arg | addr | seq | crc | cmd | erase | idle |
masato 12:c827ed52021d 88 * +-------------------------------------------------+
masato 12:c827ed52021d 89 *
masato 12:c827ed52021d 90 * R1b is the same, except it is followed by a busy signal (zeros) until
masato 12:c827ed52021d 91 * the first non-zero byte when it is ready again.
masato 12:c827ed52021d 92 *
masato 12:c827ed52021d 93 * Data Response Token
masato 12:c827ed52021d 94 * -------------------
masato 12:c827ed52021d 95 * Every data block written to the card is acknowledged by a byte
masato 12:c827ed52021d 96 * response token
masato 12:c827ed52021d 97 *
masato 12:c827ed52021d 98 * +----------------------+
masato 12:c827ed52021d 99 * | xxx | 0 | status | 1 |
masato 12:c827ed52021d 100 * +----------------------+
masato 12:c827ed52021d 101 * 010 - OK!
masato 12:c827ed52021d 102 * 101 - CRC Error
masato 12:c827ed52021d 103 * 110 - Write Error
masato 12:c827ed52021d 104 *
masato 12:c827ed52021d 105 * Single Block Read and Write
masato 12:c827ed52021d 106 * ---------------------------
masato 12:c827ed52021d 107 *
masato 12:c827ed52021d 108 * Block transfers have a byte header, followed by the data, followed
masato 12:c827ed52021d 109 * by a 16-bit CRC. In our case, the data will always be 512 bytes.
masato 12:c827ed52021d 110 *
masato 12:c827ed52021d 111 * +------+---------+---------+- - - -+---------+-----------+----------+
masato 12:c827ed52021d 112 * | 0xFE | data[0] | data[1] | | data[n] | crc[15:8] | crc[7:0] |
masato 12:c827ed52021d 113 * +------+---------+---------+- - - -+---------+-----------+----------+
masato 12:c827ed52021d 114 */
masato 12:c827ed52021d 115 #include "SDFileSystem.h"
masato 12:c827ed52021d 116 #include "mbed_debug.h"
masato 12:c827ed52021d 117
masato 12:c827ed52021d 118 #define SD_COMMAND_TIMEOUT 5000
masato 12:c827ed52021d 119
masato 12:c827ed52021d 120 #define SD_DBG 0
masato 12:c827ed52021d 121
masato 12:c827ed52021d 122 SDFileSystem::SDFileSystem(PinName mosi, PinName miso, PinName sclk, PinName cs, const char* name) :
masato 12:c827ed52021d 123 FATFileSystem(name), _spi(mosi, miso, sclk), _cs(cs) {
masato 12:c827ed52021d 124 _cs = 1;
masato 12:c827ed52021d 125 }
masato 12:c827ed52021d 126
masato 12:c827ed52021d 127 #define R1_IDLE_STATE (1 << 0)
masato 12:c827ed52021d 128 #define R1_ERASE_RESET (1 << 1)
masato 12:c827ed52021d 129 #define R1_ILLEGAL_COMMAND (1 << 2)
masato 12:c827ed52021d 130 #define R1_COM_CRC_ERROR (1 << 3)
masato 12:c827ed52021d 131 #define R1_ERASE_SEQUENCE_ERROR (1 << 4)
masato 12:c827ed52021d 132 #define R1_ADDRESS_ERROR (1 << 5)
masato 12:c827ed52021d 133 #define R1_PARAMETER_ERROR (1 << 6)
masato 12:c827ed52021d 134
masato 12:c827ed52021d 135 // Types
masato 12:c827ed52021d 136 // - v1.x Standard Capacity
masato 12:c827ed52021d 137 // - v2.x Standard Capacity
masato 12:c827ed52021d 138 // - v2.x High Capacity
masato 12:c827ed52021d 139 // - Not recognised as an SD Card
masato 12:c827ed52021d 140 #define SDCARD_FAIL 0
masato 12:c827ed52021d 141 #define SDCARD_V1 1
masato 12:c827ed52021d 142 #define SDCARD_V2 2
masato 12:c827ed52021d 143 #define SDCARD_V2HC 3
masato 12:c827ed52021d 144
masato 12:c827ed52021d 145 int SDFileSystem::initialise_card() {
masato 12:c827ed52021d 146 // Set to 100kHz for initialisation, and clock card with cs = 1
masato 12:c827ed52021d 147 _spi.frequency(100000);
masato 12:c827ed52021d 148 _cs = 1;
masato 12:c827ed52021d 149 for (int i = 0; i < 16; i++) {
masato 12:c827ed52021d 150 _spi.write(0xFF);
masato 12:c827ed52021d 151 }
masato 12:c827ed52021d 152
masato 12:c827ed52021d 153 // send CMD0, should return with all zeros except IDLE STATE set (bit 0)
masato 12:c827ed52021d 154 if (_cmd(0, 0) != R1_IDLE_STATE) {
masato 12:c827ed52021d 155 debug("No disk, or could not put SD card in to SPI idle state\n");
masato 12:c827ed52021d 156 return SDCARD_FAIL;
masato 12:c827ed52021d 157 }
masato 12:c827ed52021d 158
masato 12:c827ed52021d 159 // send CMD8 to determine whther it is ver 2.x
masato 12:c827ed52021d 160 int r = _cmd8();
masato 12:c827ed52021d 161 if (r == R1_IDLE_STATE) {
masato 12:c827ed52021d 162 return initialise_card_v2();
masato 12:c827ed52021d 163 } else if (r == (R1_IDLE_STATE | R1_ILLEGAL_COMMAND)) {
masato 12:c827ed52021d 164 return initialise_card_v1();
masato 12:c827ed52021d 165 } else {
masato 12:c827ed52021d 166 debug("Not in idle state after sending CMD8 (not an SD card?)\n");
masato 12:c827ed52021d 167 return SDCARD_FAIL;
masato 12:c827ed52021d 168 }
masato 12:c827ed52021d 169 }
masato 12:c827ed52021d 170
masato 12:c827ed52021d 171 int SDFileSystem::initialise_card_v1() {
masato 12:c827ed52021d 172 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
masato 12:c827ed52021d 173 _cmd(55, 0);
masato 12:c827ed52021d 174 if (_cmd(41, 0) == 0) {
masato 12:c827ed52021d 175 cdv = 512;
masato 12:c827ed52021d 176 debug_if(SD_DBG, "\n\rInit: SEDCARD_V1\n\r");
masato 12:c827ed52021d 177 return SDCARD_V1;
masato 12:c827ed52021d 178 }
masato 12:c827ed52021d 179 }
masato 12:c827ed52021d 180
masato 12:c827ed52021d 181 debug("Timeout waiting for v1.x card\n");
masato 12:c827ed52021d 182 return SDCARD_FAIL;
masato 12:c827ed52021d 183 }
masato 12:c827ed52021d 184
masato 12:c827ed52021d 185 int SDFileSystem::initialise_card_v2() {
masato 12:c827ed52021d 186 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
masato 12:c827ed52021d 187 wait_ms(50);
masato 12:c827ed52021d 188 _cmd58();
masato 12:c827ed52021d 189 _cmd(55, 0);
masato 12:c827ed52021d 190 if (_cmd(41, 0x40000000) == 0) {
masato 12:c827ed52021d 191 _cmd58();
masato 12:c827ed52021d 192 debug_if(SD_DBG, "\n\rInit: SDCARD_V2\n\r");
masato 12:c827ed52021d 193 cdv = 1;
masato 12:c827ed52021d 194 return SDCARD_V2;
masato 12:c827ed52021d 195 }
masato 12:c827ed52021d 196 }
masato 12:c827ed52021d 197
masato 12:c827ed52021d 198 debug("Timeout waiting for v2.x card\n");
masato 12:c827ed52021d 199 return SDCARD_FAIL;
masato 12:c827ed52021d 200 }
masato 12:c827ed52021d 201
masato 12:c827ed52021d 202 int SDFileSystem::disk_initialize() {
masato 12:c827ed52021d 203 int i = initialise_card();
masato 12:c827ed52021d 204 debug_if(SD_DBG, "init card = %d\n", i);
masato 12:c827ed52021d 205 _sectors = _sd_sectors();
masato 12:c827ed52021d 206
masato 12:c827ed52021d 207 // Set block length to 512 (CMD16)
masato 12:c827ed52021d 208 if (_cmd(16, 512) != 0) {
masato 12:c827ed52021d 209 debug("Set 512-byte block timed out\n");
masato 12:c827ed52021d 210 return 1;
masato 12:c827ed52021d 211 }
masato 12:c827ed52021d 212
masato 12:c827ed52021d 213 _spi.frequency(1000000); // Set to 1MHz for data transfer
masato 12:c827ed52021d 214 return 0;
masato 12:c827ed52021d 215 }
masato 12:c827ed52021d 216
masato 12:c827ed52021d 217 int SDFileSystem::disk_write(const uint8_t *buffer, uint64_t block_number) {
masato 12:c827ed52021d 218 // set write address for single block (CMD24)
masato 12:c827ed52021d 219 if (_cmd(24, block_number * cdv) != 0) {
masato 12:c827ed52021d 220 return 1;
masato 12:c827ed52021d 221 }
masato 12:c827ed52021d 222
masato 12:c827ed52021d 223 // send the data block
masato 12:c827ed52021d 224 _write(buffer, 512);
masato 12:c827ed52021d 225 return 0;
masato 12:c827ed52021d 226 }
masato 12:c827ed52021d 227
masato 12:c827ed52021d 228 int SDFileSystem::disk_read(uint8_t *buffer, uint64_t block_number) {
masato 12:c827ed52021d 229 // set read address for single block (CMD17)
masato 12:c827ed52021d 230 if (_cmd(17, block_number * cdv) != 0) {
masato 12:c827ed52021d 231 return 1;
masato 12:c827ed52021d 232 }
masato 12:c827ed52021d 233
masato 12:c827ed52021d 234 // receive the data
masato 12:c827ed52021d 235 _read(buffer, 512);
masato 12:c827ed52021d 236 return 0;
masato 12:c827ed52021d 237 }
masato 12:c827ed52021d 238
masato 12:c827ed52021d 239 int SDFileSystem::disk_status() { return 0; }
masato 12:c827ed52021d 240 int SDFileSystem::disk_sync() { return 0; }
masato 12:c827ed52021d 241 uint64_t SDFileSystem::disk_sectors() { return _sectors; }
masato 12:c827ed52021d 242
masato 12:c827ed52021d 243
masato 12:c827ed52021d 244 // PRIVATE FUNCTIONS
masato 12:c827ed52021d 245 int SDFileSystem::_cmd(int cmd, int arg) {
masato 12:c827ed52021d 246 _cs = 0;
masato 12:c827ed52021d 247
masato 12:c827ed52021d 248 // send a command
masato 12:c827ed52021d 249 _spi.write(0x40 | cmd);
masato 12:c827ed52021d 250 _spi.write(arg >> 24);
masato 12:c827ed52021d 251 _spi.write(arg >> 16);
masato 12:c827ed52021d 252 _spi.write(arg >> 8);
masato 12:c827ed52021d 253 _spi.write(arg >> 0);
masato 12:c827ed52021d 254 _spi.write(0x95);
masato 12:c827ed52021d 255
masato 12:c827ed52021d 256 // wait for the repsonse (response[7] == 0)
masato 12:c827ed52021d 257 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
masato 12:c827ed52021d 258 int response = _spi.write(0xFF);
masato 12:c827ed52021d 259 if (!(response & 0x80)) {
masato 12:c827ed52021d 260 _cs = 1;
masato 12:c827ed52021d 261 _spi.write(0xFF);
masato 12:c827ed52021d 262 return response;
masato 12:c827ed52021d 263 }
masato 12:c827ed52021d 264 }
masato 12:c827ed52021d 265 _cs = 1;
masato 12:c827ed52021d 266 _spi.write(0xFF);
masato 12:c827ed52021d 267 return -1; // timeout
masato 12:c827ed52021d 268 }
masato 12:c827ed52021d 269 int SDFileSystem::_cmdx(int cmd, int arg) {
masato 12:c827ed52021d 270 _cs = 0;
masato 12:c827ed52021d 271
masato 12:c827ed52021d 272 // send a command
masato 12:c827ed52021d 273 _spi.write(0x40 | cmd);
masato 12:c827ed52021d 274 _spi.write(arg >> 24);
masato 12:c827ed52021d 275 _spi.write(arg >> 16);
masato 12:c827ed52021d 276 _spi.write(arg >> 8);
masato 12:c827ed52021d 277 _spi.write(arg >> 0);
masato 12:c827ed52021d 278 _spi.write(0x95);
masato 12:c827ed52021d 279
masato 12:c827ed52021d 280 // wait for the repsonse (response[7] == 0)
masato 12:c827ed52021d 281 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
masato 12:c827ed52021d 282 int response = _spi.write(0xFF);
masato 12:c827ed52021d 283 if (!(response & 0x80)) {
masato 12:c827ed52021d 284 return response;
masato 12:c827ed52021d 285 }
masato 12:c827ed52021d 286 }
masato 12:c827ed52021d 287 _cs = 1;
masato 12:c827ed52021d 288 _spi.write(0xFF);
masato 12:c827ed52021d 289 return -1; // timeout
masato 12:c827ed52021d 290 }
masato 12:c827ed52021d 291
masato 12:c827ed52021d 292
masato 12:c827ed52021d 293 int SDFileSystem::_cmd58() {
masato 12:c827ed52021d 294 _cs = 0;
masato 12:c827ed52021d 295 int arg = 0;
masato 12:c827ed52021d 296
masato 12:c827ed52021d 297 // send a command
masato 12:c827ed52021d 298 _spi.write(0x40 | 58);
masato 12:c827ed52021d 299 _spi.write(arg >> 24);
masato 12:c827ed52021d 300 _spi.write(arg >> 16);
masato 12:c827ed52021d 301 _spi.write(arg >> 8);
masato 12:c827ed52021d 302 _spi.write(arg >> 0);
masato 12:c827ed52021d 303 _spi.write(0x95);
masato 12:c827ed52021d 304
masato 12:c827ed52021d 305 // wait for the repsonse (response[7] == 0)
masato 12:c827ed52021d 306 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
masato 12:c827ed52021d 307 int response = _spi.write(0xFF);
masato 12:c827ed52021d 308 if (!(response & 0x80)) {
masato 12:c827ed52021d 309 int ocr = _spi.write(0xFF) << 24;
masato 12:c827ed52021d 310 ocr |= _spi.write(0xFF) << 16;
masato 12:c827ed52021d 311 ocr |= _spi.write(0xFF) << 8;
masato 12:c827ed52021d 312 ocr |= _spi.write(0xFF) << 0;
masato 12:c827ed52021d 313 _cs = 1;
masato 12:c827ed52021d 314 _spi.write(0xFF);
masato 12:c827ed52021d 315 return response;
masato 12:c827ed52021d 316 }
masato 12:c827ed52021d 317 }
masato 12:c827ed52021d 318 _cs = 1;
masato 12:c827ed52021d 319 _spi.write(0xFF);
masato 12:c827ed52021d 320 return -1; // timeout
masato 12:c827ed52021d 321 }
masato 12:c827ed52021d 322
masato 12:c827ed52021d 323 int SDFileSystem::_cmd8() {
masato 12:c827ed52021d 324 _cs = 0;
masato 12:c827ed52021d 325
masato 12:c827ed52021d 326 // send a command
masato 12:c827ed52021d 327 _spi.write(0x40 | 8); // CMD8
masato 12:c827ed52021d 328 _spi.write(0x00); // reserved
masato 12:c827ed52021d 329 _spi.write(0x00); // reserved
masato 12:c827ed52021d 330 _spi.write(0x01); // 3.3v
masato 12:c827ed52021d 331 _spi.write(0xAA); // check pattern
masato 12:c827ed52021d 332 _spi.write(0x87); // crc
masato 12:c827ed52021d 333
masato 12:c827ed52021d 334 // wait for the repsonse (response[7] == 0)
masato 12:c827ed52021d 335 for (int i = 0; i < SD_COMMAND_TIMEOUT * 1000; i++) {
masato 12:c827ed52021d 336 char response[5];
masato 12:c827ed52021d 337 response[0] = _spi.write(0xFF);
masato 12:c827ed52021d 338 if (!(response[0] & 0x80)) {
masato 12:c827ed52021d 339 for (int j = 1; j < 5; j++) {
masato 12:c827ed52021d 340 response[i] = _spi.write(0xFF);
masato 12:c827ed52021d 341 }
masato 12:c827ed52021d 342 _cs = 1;
masato 12:c827ed52021d 343 _spi.write(0xFF);
masato 12:c827ed52021d 344 return response[0];
masato 12:c827ed52021d 345 }
masato 12:c827ed52021d 346 }
masato 12:c827ed52021d 347 _cs = 1;
masato 12:c827ed52021d 348 _spi.write(0xFF);
masato 12:c827ed52021d 349 return -1; // timeout
masato 12:c827ed52021d 350 }
masato 12:c827ed52021d 351
masato 12:c827ed52021d 352 int SDFileSystem::_read(uint8_t *buffer, uint32_t length) {
masato 12:c827ed52021d 353 _cs = 0;
masato 12:c827ed52021d 354
masato 12:c827ed52021d 355 // read until start byte (0xFF)
masato 12:c827ed52021d 356 while (_spi.write(0xFF) != 0xFE);
masato 12:c827ed52021d 357
masato 12:c827ed52021d 358 // read data
masato 12:c827ed52021d 359 for (int i = 0; i < length; i++) {
masato 12:c827ed52021d 360 buffer[i] = _spi.write(0xFF);
masato 12:c827ed52021d 361 }
masato 12:c827ed52021d 362 _spi.write(0xFF); // checksum
masato 12:c827ed52021d 363 _spi.write(0xFF);
masato 12:c827ed52021d 364
masato 12:c827ed52021d 365 _cs = 1;
masato 12:c827ed52021d 366 _spi.write(0xFF);
masato 12:c827ed52021d 367 return 0;
masato 12:c827ed52021d 368 }
masato 12:c827ed52021d 369
masato 12:c827ed52021d 370 int SDFileSystem::_write(const uint8_t*buffer, uint32_t length) {
masato 12:c827ed52021d 371 _cs = 0;
masato 12:c827ed52021d 372
masato 12:c827ed52021d 373 // indicate start of block
masato 12:c827ed52021d 374 _spi.write(0xFE);
masato 12:c827ed52021d 375
masato 12:c827ed52021d 376 // write the data
masato 12:c827ed52021d 377 for (int i = 0; i < length; i++) {
masato 12:c827ed52021d 378 _spi.write(buffer[i]);
masato 12:c827ed52021d 379 }
masato 12:c827ed52021d 380
masato 12:c827ed52021d 381 // write the checksum
masato 12:c827ed52021d 382 _spi.write(0xFF);
masato 12:c827ed52021d 383 _spi.write(0xFF);
masato 12:c827ed52021d 384
masato 12:c827ed52021d 385 // check the response token
masato 12:c827ed52021d 386 if ((_spi.write(0xFF) & 0x1F) != 0x05) {
masato 12:c827ed52021d 387 _cs = 1;
masato 12:c827ed52021d 388 _spi.write(0xFF);
masato 12:c827ed52021d 389 return 1;
masato 12:c827ed52021d 390 }
masato 12:c827ed52021d 391
masato 12:c827ed52021d 392 // wait for write to finish
masato 12:c827ed52021d 393 while (_spi.write(0xFF) == 0);
masato 12:c827ed52021d 394
masato 12:c827ed52021d 395 _cs = 1;
masato 12:c827ed52021d 396 _spi.write(0xFF);
masato 12:c827ed52021d 397 return 0;
masato 12:c827ed52021d 398 }
masato 12:c827ed52021d 399
masato 12:c827ed52021d 400 static uint32_t ext_bits(unsigned char *data, int msb, int lsb) {
masato 12:c827ed52021d 401 uint32_t bits = 0;
masato 12:c827ed52021d 402 uint32_t size = 1 + msb - lsb;
masato 12:c827ed52021d 403 for (int i = 0; i < size; i++) {
masato 12:c827ed52021d 404 uint32_t position = lsb + i;
masato 12:c827ed52021d 405 uint32_t byte = 15 - (position >> 3);
masato 12:c827ed52021d 406 uint32_t bit = position & 0x7;
masato 12:c827ed52021d 407 uint32_t value = (data[byte] >> bit) & 1;
masato 12:c827ed52021d 408 bits |= value << i;
masato 12:c827ed52021d 409 }
masato 12:c827ed52021d 410 return bits;
masato 12:c827ed52021d 411 }
masato 12:c827ed52021d 412
masato 12:c827ed52021d 413 uint64_t SDFileSystem::_sd_sectors() {
masato 12:c827ed52021d 414 uint32_t c_size, c_size_mult, read_bl_len;
masato 12:c827ed52021d 415 uint32_t block_len, mult, blocknr, capacity;
masato 12:c827ed52021d 416 uint32_t hc_c_size;
masato 12:c827ed52021d 417 uint64_t blocks;
masato 12:c827ed52021d 418
masato 12:c827ed52021d 419 // CMD9, Response R2 (R1 byte + 16-byte block read)
masato 12:c827ed52021d 420 if (_cmdx(9, 0) != 0) {
masato 12:c827ed52021d 421 debug("Didn't get a response from the disk\n");
masato 12:c827ed52021d 422 return 0;
masato 12:c827ed52021d 423 }
masato 12:c827ed52021d 424
masato 12:c827ed52021d 425 uint8_t csd[16];
masato 12:c827ed52021d 426 if (_read(csd, 16) != 0) {
masato 12:c827ed52021d 427 debug("Couldn't read csd response from disk\n");
masato 12:c827ed52021d 428 return 0;
masato 12:c827ed52021d 429 }
masato 12:c827ed52021d 430
masato 12:c827ed52021d 431 // csd_structure : csd[127:126]
masato 12:c827ed52021d 432 // c_size : csd[73:62]
masato 12:c827ed52021d 433 // c_size_mult : csd[49:47]
masato 12:c827ed52021d 434 // read_bl_len : csd[83:80] - the *maximum* read block length
masato 12:c827ed52021d 435
masato 12:c827ed52021d 436 int csd_structure = ext_bits(csd, 127, 126);
masato 12:c827ed52021d 437
masato 12:c827ed52021d 438 switch (csd_structure) {
masato 12:c827ed52021d 439 case 0:
masato 12:c827ed52021d 440 cdv = 512;
masato 12:c827ed52021d 441 c_size = ext_bits(csd, 73, 62);
masato 12:c827ed52021d 442 c_size_mult = ext_bits(csd, 49, 47);
masato 12:c827ed52021d 443 read_bl_len = ext_bits(csd, 83, 80);
masato 12:c827ed52021d 444
masato 12:c827ed52021d 445 block_len = 1 << read_bl_len;
masato 12:c827ed52021d 446 mult = 1 << (c_size_mult + 2);
masato 12:c827ed52021d 447 blocknr = (c_size + 1) * mult;
masato 12:c827ed52021d 448 capacity = blocknr * block_len;
masato 12:c827ed52021d 449 blocks = capacity / 512;
masato 12:c827ed52021d 450 debug_if(SD_DBG, "\n\rSDCard\n\rc_size: %d \n\rcapacity: %ld \n\rsectors: %lld\n\r", c_size, capacity, blocks);
masato 12:c827ed52021d 451 break;
masato 12:c827ed52021d 452
masato 12:c827ed52021d 453 case 1:
masato 12:c827ed52021d 454 cdv = 1;
masato 12:c827ed52021d 455 hc_c_size = ext_bits(csd, 63, 48);
masato 12:c827ed52021d 456 blocks = (hc_c_size+1)*1024;
masato 12:c827ed52021d 457 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);
masato 12:c827ed52021d 458 break;
masato 12:c827ed52021d 459
masato 12:c827ed52021d 460 default:
masato 12:c827ed52021d 461 debug("CSD struct unsupported\r\n");
masato 12:c827ed52021d 462 return 0;
masato 12:c827ed52021d 463 };
masato 12:c827ed52021d 464 return blocks;
masato 12:c827ed52021d 465 }