yoshinari kou / Mbed 2 deprecated WW_SD_save_IRVer2

Save IR data

Dependencies:   mbed

SDFileSystem.cpp@0:decd8d14cc06, 2011-08-31 (annotated)

Committer:
halfpitch
Date:
Wed Aug 31 15:50:30 2011 +0000
Revision:
0:decd8d14cc06
Rev.A

Who changed what in which revision?

UserRevisionLine numberNew contents of line
halfpitch 0:decd8d14cc06 1 /* mbed Microcontroller Library - SDFileSystem
halfpitch 0:decd8d14cc06 2 * Copyright (c) 2008-2009, sford
halfpitch 0:decd8d14cc06 3 */
halfpitch 0:decd8d14cc06 4
halfpitch 0:decd8d14cc06 5 // VERY DRAFT CODE! Needs serious rework/refactoring
halfpitch 0:decd8d14cc06 6
halfpitch 0:decd8d14cc06 7 /* Introduction
halfpitch 0:decd8d14cc06 8 * ------------
halfpitch 0:decd8d14cc06 9 * SD and MMC cards support a number of interfaces, but common to them all
halfpitch 0:decd8d14cc06 10 * is one based on SPI. This is the one I'm implmenting because it means
halfpitch 0:decd8d14cc06 11 * it is much more portable even though not so performant, and we already
halfpitch 0:decd8d14cc06 12 * have the mbed SPI Interface!
halfpitch 0:decd8d14cc06 13 *
halfpitch 0:decd8d14cc06 14 * The main reference I'm using is Chapter 7, "SPI Mode" of:
halfpitch 0:decd8d14cc06 15 * http://www.sdcard.org/developers/tech/sdcard/pls/Simplified_Physical_Layer_Spec.pdf
halfpitch 0:decd8d14cc06 16 *
halfpitch 0:decd8d14cc06 17 * SPI Startup
halfpitch 0:decd8d14cc06 18 * -----------
halfpitch 0:decd8d14cc06 19 * The SD card powers up in SD mode. The SPI interface mode is selected by
halfpitch 0:decd8d14cc06 20 * asserting CS low and sending the reset command (CMD0). The card will
halfpitch 0:decd8d14cc06 21 * respond with a (R1) response.
halfpitch 0:decd8d14cc06 22 *
halfpitch 0:decd8d14cc06 23 * CMD8 is optionally sent to determine the voltage range supported, and
halfpitch 0:decd8d14cc06 24 * indirectly determine whether it is a version 1.x SD/non-SD card or
halfpitch 0:decd8d14cc06 25 * version 2.x. I'll just ignore this for now.
halfpitch 0:decd8d14cc06 26 *
halfpitch 0:decd8d14cc06 27 * ACMD41 is repeatedly issued to initialise the card, until "in idle"
halfpitch 0:decd8d14cc06 28 * (bit 0) of the R1 response goes to '0', indicating it is initialised.
halfpitch 0:decd8d14cc06 29 *
halfpitch 0:decd8d14cc06 30 * You should also indicate whether the host supports High Capicity cards,
halfpitch 0:decd8d14cc06 31 * and check whether the card is high capacity - i'll also ignore this
halfpitch 0:decd8d14cc06 32 *
halfpitch 0:decd8d14cc06 33 * SPI Protocol
halfpitch 0:decd8d14cc06 34 * ------------
halfpitch 0:decd8d14cc06 35 * The SD SPI protocol is based on transactions made up of 8-bit words, with
halfpitch 0:decd8d14cc06 36 * the host starting every bus transaction by asserting the CS signal low. The
halfpitch 0:decd8d14cc06 37 * card always responds to commands, data blocks and errors.
halfpitch 0:decd8d14cc06 38 *
halfpitch 0:decd8d14cc06 39 * The protocol supports a CRC, but by default it is off (except for the
halfpitch 0:decd8d14cc06 40 * first reset CMD0, where the CRC can just be pre-calculated, and CMD8)
halfpitch 0:decd8d14cc06 41 * I'll leave the CRC off I think!
halfpitch 0:decd8d14cc06 42 *
halfpitch 0:decd8d14cc06 43 * Standard capacity cards have variable data block sizes, whereas High
halfpitch 0:decd8d14cc06 44 * Capacity cards fix the size of data block to 512 bytes. I'll therefore
halfpitch 0:decd8d14cc06 45 * just always use the Standard Capacity cards with a block size of 512 bytes.
halfpitch 0:decd8d14cc06 46 * This is set with CMD16.
halfpitch 0:decd8d14cc06 47 *
halfpitch 0:decd8d14cc06 48 * You can read and write single blocks (CMD17, CMD25) or multiple blocks
halfpitch 0:decd8d14cc06 49 * (CMD18, CMD25). For simplicity, I'll just use single block accesses. When
halfpitch 0:decd8d14cc06 50 * the card gets a read command, it responds with a response token, and then
halfpitch 0:decd8d14cc06 51 * a data token or an error.
halfpitch 0:decd8d14cc06 52 *
halfpitch 0:decd8d14cc06 53 * SPI Command Format
halfpitch 0:decd8d14cc06 54 * ------------------
halfpitch 0:decd8d14cc06 55 * Commands are 6-bytes long, containing the command, 32-bit argument, and CRC.
halfpitch 0:decd8d14cc06 56 *
halfpitch 0:decd8d14cc06 57 * +---------------+------------+------------+-----------+----------+--------------+
halfpitch 0:decd8d14cc06 58 * | 01 | cmd[5:0] | arg[31:24] | arg[23:16] | arg[15:8] | arg[7:0] | crc[6:0] | 1 |
halfpitch 0:decd8d14cc06 59 * +---------------+------------+------------+-----------+----------+--------------+
halfpitch 0:decd8d14cc06 60 *
halfpitch 0:decd8d14cc06 61 * As I'm not using CRC, I can fix that byte to what is needed for CMD0 (0x95)
halfpitch 0:decd8d14cc06 62 *
halfpitch 0:decd8d14cc06 63 * All Application Specific commands shall be preceded with APP_CMD (CMD55).
halfpitch 0:decd8d14cc06 64 *
halfpitch 0:decd8d14cc06 65 * SPI Response Format
halfpitch 0:decd8d14cc06 66 * -------------------
halfpitch 0:decd8d14cc06 67 * The main response format (R1) is a status byte (normally zero). Key flags:
halfpitch 0:decd8d14cc06 68 * idle - 1 if the card is in an idle state/initialising
halfpitch 0:decd8d14cc06 69 * cmd - 1 if an illegal command code was detected
halfpitch 0:decd8d14cc06 70 *
halfpitch 0:decd8d14cc06 71 * +-------------------------------------------------+
halfpitch 0:decd8d14cc06 72 * R1 | 0 | arg | addr | seq | crc | cmd | erase | idle |
halfpitch 0:decd8d14cc06 73 * +-------------------------------------------------+
halfpitch 0:decd8d14cc06 74 *
halfpitch 0:decd8d14cc06 75 * R1b is the same, except it is followed by a busy signal (zeros) until
halfpitch 0:decd8d14cc06 76 * the first non-zero byte when it is ready again.
halfpitch 0:decd8d14cc06 77 *
halfpitch 0:decd8d14cc06 78 * Data Response Token
halfpitch 0:decd8d14cc06 79 * -------------------
halfpitch 0:decd8d14cc06 80 * Every data block written to the card is acknowledged by a byte
halfpitch 0:decd8d14cc06 81 * response token
halfpitch 0:decd8d14cc06 82 *
halfpitch 0:decd8d14cc06 83 * +----------------------+
halfpitch 0:decd8d14cc06 84 * | xxx | 0 | status | 1 |
halfpitch 0:decd8d14cc06 85 * +----------------------+
halfpitch 0:decd8d14cc06 86 * 010 - OK!
halfpitch 0:decd8d14cc06 87 * 101 - CRC Error
halfpitch 0:decd8d14cc06 88 * 110 - Write Error
halfpitch 0:decd8d14cc06 89 *
halfpitch 0:decd8d14cc06 90 * Single Block Read and Write
halfpitch 0:decd8d14cc06 91 * ---------------------------
halfpitch 0:decd8d14cc06 92 *
halfpitch 0:decd8d14cc06 93 * Block transfers have a byte header, followed by the data, followed
halfpitch 0:decd8d14cc06 94 * by a 16-bit CRC. In our case, the data will always be 512 bytes.
halfpitch 0:decd8d14cc06 95 *
halfpitch 0:decd8d14cc06 96 * +------+---------+---------+- - - -+---------+-----------+----------+
halfpitch 0:decd8d14cc06 97 * | 0xFE | data[0] | data[1] | | data[n] | crc[15:8] | crc[7:0] |
halfpitch 0:decd8d14cc06 98 * +------+---------+---------+- - - -+---------+-----------+----------+
halfpitch 0:decd8d14cc06 99 */
halfpitch 0:decd8d14cc06 100
halfpitch 0:decd8d14cc06 101 #include "SDFileSystem.h"
halfpitch 0:decd8d14cc06 102
halfpitch 0:decd8d14cc06 103 #define SD_COMMAND_TIMEOUT 5000
halfpitch 0:decd8d14cc06 104
halfpitch 0:decd8d14cc06 105 //Nest Egg Inc.-----
halfpitch 0:decd8d14cc06 106 //http://wizard.nestegg.jp/
halfpitch 0:decd8d14cc06 107 int ch_num;
halfpitch 0:decd8d14cc06 108 //------------------
halfpitch 0:decd8d14cc06 109
halfpitch 0:decd8d14cc06 110 SDFileSystem::SDFileSystem(PinName mosi, PinName miso, PinName sclk, PinName cs, const char* name) :
halfpitch 0:decd8d14cc06 111 FATFileSystem(name), _spi(mosi, miso, sclk), _cs(cs) {
halfpitch 0:decd8d14cc06 112 _cs.wwCSwrite(reset_ch);;
halfpitch 0:decd8d14cc06 113 }
halfpitch 0:decd8d14cc06 114
halfpitch 0:decd8d14cc06 115 //Nest Egg Inc.-----
halfpitch 0:decd8d14cc06 116 //http://wizard.nestegg.jp/
halfpitch 0:decd8d14cc06 117 void SDFileSystem::SetCh(int ch){
halfpitch 0:decd8d14cc06 118 ch_num = ch;
halfpitch 0:decd8d14cc06 119 }
halfpitch 0:decd8d14cc06 120 //------------------
halfpitch 0:decd8d14cc06 121
halfpitch 0:decd8d14cc06 122 #define R1_IDLE_STATE (1 << 0)
halfpitch 0:decd8d14cc06 123 #define R1_ERASE_RESET (1 << 1)
halfpitch 0:decd8d14cc06 124 #define R1_ILLEGAL_COMMAND (1 << 2)
halfpitch 0:decd8d14cc06 125 #define R1_COM_CRC_ERROR (1 << 3)
halfpitch 0:decd8d14cc06 126 #define R1_ERASE_SEQUENCE_ERROR (1 << 4)
halfpitch 0:decd8d14cc06 127 #define R1_ADDRESS_ERROR (1 << 5)
halfpitch 0:decd8d14cc06 128 #define R1_PARAMETER_ERROR (1 << 6)
halfpitch 0:decd8d14cc06 129
halfpitch 0:decd8d14cc06 130 // Types
halfpitch 0:decd8d14cc06 131 // - v1.x Standard Capacity
halfpitch 0:decd8d14cc06 132 // - v2.x Standard Capacity
halfpitch 0:decd8d14cc06 133 // - v2.x High Capacity
halfpitch 0:decd8d14cc06 134 // - Not recognised as an SD Card
halfpitch 0:decd8d14cc06 135
halfpitch 0:decd8d14cc06 136 #define SDCARD_FAIL 0
halfpitch 0:decd8d14cc06 137 #define SDCARD_V1 1
halfpitch 0:decd8d14cc06 138 #define SDCARD_V2 2
halfpitch 0:decd8d14cc06 139 #define SDCARD_V2HC 3
halfpitch 0:decd8d14cc06 140
halfpitch 0:decd8d14cc06 141 int SDFileSystem::initialise_card() {
halfpitch 0:decd8d14cc06 142 // Set to 100kHz for initialisation, and clock card with cs = 1
halfpitch 0:decd8d14cc06 143 _spi.frequency(100000);
halfpitch 0:decd8d14cc06 144 _cs.wwCSwrite(reset_ch);
halfpitch 0:decd8d14cc06 145
halfpitch 0:decd8d14cc06 146 /* while(1){
halfpitch 0:decd8d14cc06 147 _cs.wwCSwrite(reset_ch);
halfpitch 0:decd8d14cc06 148 wait(1);
halfpitch 0:decd8d14cc06 149 _cs.wwCSwrite(0x00);
halfpitch 0:decd8d14cc06 150 wait(1);
halfpitch 0:decd8d14cc06 151 }
halfpitch 0:decd8d14cc06 152 */
halfpitch 0:decd8d14cc06 153 for(int i=0; i<16; i++) {
halfpitch 0:decd8d14cc06 154 _spi.write(0xFF);
halfpitch 0:decd8d14cc06 155 }
halfpitch 0:decd8d14cc06 156
halfpitch 0:decd8d14cc06 157 // send CMD0, should return with all zeros except IDLE STATE set (bit 0)
halfpitch 0:decd8d14cc06 158 if(_cmd(0, 0) != R1_IDLE_STATE) {
halfpitch 0:decd8d14cc06 159 fprintf(stderr, "No disk, or could not put SD card in to SPI idle state\n");
halfpitch 0:decd8d14cc06 160 return SDCARD_FAIL;
halfpitch 0:decd8d14cc06 161 }
halfpitch 0:decd8d14cc06 162
halfpitch 0:decd8d14cc06 163 // send CMD8 to determine whther it is ver 2.x
halfpitch 0:decd8d14cc06 164 int r = _cmd8();
halfpitch 0:decd8d14cc06 165 if(r == R1_IDLE_STATE) {
halfpitch 0:decd8d14cc06 166 return initialise_card_v2();
halfpitch 0:decd8d14cc06 167 } else if(r == (R1_IDLE_STATE | R1_ILLEGAL_COMMAND)) {
halfpitch 0:decd8d14cc06 168 return initialise_card_v1();
halfpitch 0:decd8d14cc06 169 } else {
halfpitch 0:decd8d14cc06 170 fprintf(stderr, "Not in idle state after sending CMD8 (not an SD card?)\n");
halfpitch 0:decd8d14cc06 171 return SDCARD_FAIL;
halfpitch 0:decd8d14cc06 172 }
halfpitch 0:decd8d14cc06 173 }
halfpitch 0:decd8d14cc06 174
halfpitch 0:decd8d14cc06 175 int SDFileSystem::initialise_card_v1() {
halfpitch 0:decd8d14cc06 176 for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
halfpitch 0:decd8d14cc06 177 _cmd(55, 0);
halfpitch 0:decd8d14cc06 178 if(_cmd(41, 0) == 0) {
halfpitch 0:decd8d14cc06 179 return SDCARD_V1;
halfpitch 0:decd8d14cc06 180 }
halfpitch 0:decd8d14cc06 181 }
halfpitch 0:decd8d14cc06 182
halfpitch 0:decd8d14cc06 183 fprintf(stderr, "Timeout waiting for v1.x card\n");
halfpitch 0:decd8d14cc06 184 return SDCARD_FAIL;
halfpitch 0:decd8d14cc06 185 }
halfpitch 0:decd8d14cc06 186
halfpitch 0:decd8d14cc06 187 int SDFileSystem::initialise_card_v2() {
halfpitch 0:decd8d14cc06 188
halfpitch 0:decd8d14cc06 189 for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
halfpitch 0:decd8d14cc06 190 _cmd(55, 0);
halfpitch 0:decd8d14cc06 191 if(_cmd(41, 0) == 0) {
halfpitch 0:decd8d14cc06 192 _cmd58();
halfpitch 0:decd8d14cc06 193 return SDCARD_V2;
halfpitch 0:decd8d14cc06 194 }
halfpitch 0:decd8d14cc06 195 }
halfpitch 0:decd8d14cc06 196
halfpitch 0:decd8d14cc06 197 fprintf(stderr, "Timeout waiting for v2.x card\n");
halfpitch 0:decd8d14cc06 198 return SDCARD_FAIL;
halfpitch 0:decd8d14cc06 199 }
halfpitch 0:decd8d14cc06 200
halfpitch 0:decd8d14cc06 201 int SDFileSystem::disk_initialize() {
halfpitch 0:decd8d14cc06 202
halfpitch 0:decd8d14cc06 203 int i = initialise_card();
halfpitch 0:decd8d14cc06 204 // printf("init card = %d\n", i);
halfpitch 0:decd8d14cc06 205 // printf("OK\n");
halfpitch 0:decd8d14cc06 206
halfpitch 0:decd8d14cc06 207 _sectors = _sd_sectors();
halfpitch 0:decd8d14cc06 208
halfpitch 0:decd8d14cc06 209 // Set block length to 512 (CMD16)
halfpitch 0:decd8d14cc06 210 if(_cmd(16, 512) != 0) {
halfpitch 0:decd8d14cc06 211 fprintf(stderr, "Set 512-byte block timed out\n");
halfpitch 0:decd8d14cc06 212 return 1;
halfpitch 0:decd8d14cc06 213 }
halfpitch 0:decd8d14cc06 214
halfpitch 0:decd8d14cc06 215 _spi.frequency(1000000); // Set to 1MHz for data transfer
halfpitch 0:decd8d14cc06 216 return 0;
halfpitch 0:decd8d14cc06 217 }
halfpitch 0:decd8d14cc06 218
halfpitch 0:decd8d14cc06 219 int SDFileSystem::disk_write(const char *buffer, int block_number) {
halfpitch 0:decd8d14cc06 220 // set write address for single block (CMD24)
halfpitch 0:decd8d14cc06 221 if(_cmd(24, block_number * 512) != 0) {
halfpitch 0:decd8d14cc06 222 return 1;
halfpitch 0:decd8d14cc06 223 }
halfpitch 0:decd8d14cc06 224
halfpitch 0:decd8d14cc06 225 // send the data block
halfpitch 0:decd8d14cc06 226 _write(buffer, 512);
halfpitch 0:decd8d14cc06 227 return 0;
halfpitch 0:decd8d14cc06 228 }
halfpitch 0:decd8d14cc06 229
halfpitch 0:decd8d14cc06 230 int SDFileSystem::disk_read(char *buffer, int block_number) {
halfpitch 0:decd8d14cc06 231 // set read address for single block (CMD17)
halfpitch 0:decd8d14cc06 232 if(_cmd(17, block_number * 512) != 0) {
halfpitch 0:decd8d14cc06 233 return 1;
halfpitch 0:decd8d14cc06 234 }
halfpitch 0:decd8d14cc06 235
halfpitch 0:decd8d14cc06 236 // receive the data
halfpitch 0:decd8d14cc06 237 _read(buffer, 512);
halfpitch 0:decd8d14cc06 238 return 0;
halfpitch 0:decd8d14cc06 239 }
halfpitch 0:decd8d14cc06 240
halfpitch 0:decd8d14cc06 241 int SDFileSystem::disk_status() { return 0; }
halfpitch 0:decd8d14cc06 242 int SDFileSystem::disk_sync() { return 0; }
halfpitch 0:decd8d14cc06 243 int SDFileSystem::disk_sectors() { return _sectors; }
halfpitch 0:decd8d14cc06 244
halfpitch 0:decd8d14cc06 245 // PRIVATE FUNCTIONS
halfpitch 0:decd8d14cc06 246
halfpitch 0:decd8d14cc06 247 int SDFileSystem::_cmd(int cmd, int arg) {
halfpitch 0:decd8d14cc06 248 _cs.wwCSwrite(ch_num);
halfpitch 0:decd8d14cc06 249
halfpitch 0:decd8d14cc06 250 // send a command
halfpitch 0:decd8d14cc06 251 _spi.write(0x40 | cmd);
halfpitch 0:decd8d14cc06 252 _spi.write(arg >> 24);
halfpitch 0:decd8d14cc06 253 _spi.write(arg >> 16);
halfpitch 0:decd8d14cc06 254 _spi.write(arg >> 8);
halfpitch 0:decd8d14cc06 255 _spi.write(arg >> 0);
halfpitch 0:decd8d14cc06 256 _spi.write(0x95);
halfpitch 0:decd8d14cc06 257
halfpitch 0:decd8d14cc06 258 // wait for the repsonse (response[7] == 0)
halfpitch 0:decd8d14cc06 259 for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
halfpitch 0:decd8d14cc06 260 int response = _spi.write(0xFF);
halfpitch 0:decd8d14cc06 261 if(!(response & 0x80)) {
halfpitch 0:decd8d14cc06 262 _cs.wwCSwrite(reset_ch);;
halfpitch 0:decd8d14cc06 263 _spi.write(0xFF);
halfpitch 0:decd8d14cc06 264 return response;
halfpitch 0:decd8d14cc06 265 }
halfpitch 0:decd8d14cc06 266 }
halfpitch 0:decd8d14cc06 267 _cs.wwCSwrite(reset_ch);;
halfpitch 0:decd8d14cc06 268 _spi.write(0xFF);
halfpitch 0:decd8d14cc06 269 return -1; // timeout
halfpitch 0:decd8d14cc06 270 }
halfpitch 0:decd8d14cc06 271 int SDFileSystem::_cmdx(int cmd, int arg) {
halfpitch 0:decd8d14cc06 272 _cs.wwCSwrite(ch_num);
halfpitch 0:decd8d14cc06 273
halfpitch 0:decd8d14cc06 274 // send a command
halfpitch 0:decd8d14cc06 275 _spi.write(0x40 | cmd);
halfpitch 0:decd8d14cc06 276 _spi.write(arg >> 24);
halfpitch 0:decd8d14cc06 277 _spi.write(arg >> 16);
halfpitch 0:decd8d14cc06 278 _spi.write(arg >> 8);
halfpitch 0:decd8d14cc06 279 _spi.write(arg >> 0);
halfpitch 0:decd8d14cc06 280 _spi.write(0x95);
halfpitch 0:decd8d14cc06 281
halfpitch 0:decd8d14cc06 282 // wait for the repsonse (response[7] == 0)
halfpitch 0:decd8d14cc06 283 for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
halfpitch 0:decd8d14cc06 284 int response = _spi.write(0xFF);
halfpitch 0:decd8d14cc06 285 if(!(response & 0x80)) {
halfpitch 0:decd8d14cc06 286 return response;
halfpitch 0:decd8d14cc06 287 }
halfpitch 0:decd8d14cc06 288 }
halfpitch 0:decd8d14cc06 289 _cs.wwCSwrite(reset_ch);;
halfpitch 0:decd8d14cc06 290 _spi.write(0xFF);
halfpitch 0:decd8d14cc06 291 return -1; // timeout
halfpitch 0:decd8d14cc06 292 }
halfpitch 0:decd8d14cc06 293
halfpitch 0:decd8d14cc06 294
halfpitch 0:decd8d14cc06 295 int SDFileSystem::_cmd58() {
halfpitch 0:decd8d14cc06 296 _cs.wwCSwrite(ch_num);
halfpitch 0:decd8d14cc06 297 int arg = 0;
halfpitch 0:decd8d14cc06 298
halfpitch 0:decd8d14cc06 299 // send a command
halfpitch 0:decd8d14cc06 300 _spi.write(0x40 | 58);
halfpitch 0:decd8d14cc06 301 _spi.write(arg >> 24);
halfpitch 0:decd8d14cc06 302 _spi.write(arg >> 16);
halfpitch 0:decd8d14cc06 303 _spi.write(arg >> 8);
halfpitch 0:decd8d14cc06 304 _spi.write(arg >> 0);
halfpitch 0:decd8d14cc06 305 _spi.write(0x95);
halfpitch 0:decd8d14cc06 306
halfpitch 0:decd8d14cc06 307 // wait for the repsonse (response[7] == 0)
halfpitch 0:decd8d14cc06 308 for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
halfpitch 0:decd8d14cc06 309 int response = _spi.write(0xFF);
halfpitch 0:decd8d14cc06 310 if(!(response & 0x80)) {
halfpitch 0:decd8d14cc06 311 int ocr = _spi.write(0xFF) << 24;
halfpitch 0:decd8d14cc06 312 ocr |= _spi.write(0xFF) << 16;
halfpitch 0:decd8d14cc06 313 ocr |= _spi.write(0xFF) << 8;
halfpitch 0:decd8d14cc06 314 ocr |= _spi.write(0xFF) << 0;
halfpitch 0:decd8d14cc06 315 // printf("OCR = 0x%08X\n", ocr);
halfpitch 0:decd8d14cc06 316 _cs.wwCSwrite(reset_ch);;
halfpitch 0:decd8d14cc06 317 _spi.write(0xFF);
halfpitch 0:decd8d14cc06 318 return response;
halfpitch 0:decd8d14cc06 319 }
halfpitch 0:decd8d14cc06 320 }
halfpitch 0:decd8d14cc06 321 _cs.wwCSwrite(reset_ch);;
halfpitch 0:decd8d14cc06 322 _spi.write(0xFF);
halfpitch 0:decd8d14cc06 323 return -1; // timeout
halfpitch 0:decd8d14cc06 324 }
halfpitch 0:decd8d14cc06 325
halfpitch 0:decd8d14cc06 326 int SDFileSystem::_cmd8() {
halfpitch 0:decd8d14cc06 327 _cs.wwCSwrite(ch_num);
halfpitch 0:decd8d14cc06 328
halfpitch 0:decd8d14cc06 329 // send a command
halfpitch 0:decd8d14cc06 330 _spi.write(0x40 | 8); // CMD8
halfpitch 0:decd8d14cc06 331 _spi.write(0x00); // reserved
halfpitch 0:decd8d14cc06 332 _spi.write(0x00); // reserved
halfpitch 0:decd8d14cc06 333 _spi.write(0x01); // 3.3v
halfpitch 0:decd8d14cc06 334 _spi.write(0xAA); // check pattern
halfpitch 0:decd8d14cc06 335 _spi.write(0x87); // crc
halfpitch 0:decd8d14cc06 336
halfpitch 0:decd8d14cc06 337 // wait for the repsonse (response[7] == 0)
halfpitch 0:decd8d14cc06 338 for(int i=0; i<SD_COMMAND_TIMEOUT * 1000; i++) {
halfpitch 0:decd8d14cc06 339 char response[5];
halfpitch 0:decd8d14cc06 340 response[0] = _spi.write(0xFF);
halfpitch 0:decd8d14cc06 341 if(!(response[0] & 0x80)) {
halfpitch 0:decd8d14cc06 342 for(int j=1; j<5; j++) {
halfpitch 0:decd8d14cc06 343 response[i] = _spi.write(0xFF);
halfpitch 0:decd8d14cc06 344 }
halfpitch 0:decd8d14cc06 345 _cs.wwCSwrite(reset_ch);;
halfpitch 0:decd8d14cc06 346 _spi.write(0xFF);
halfpitch 0:decd8d14cc06 347 return response[0];
halfpitch 0:decd8d14cc06 348 }
halfpitch 0:decd8d14cc06 349 }
halfpitch 0:decd8d14cc06 350 _cs.wwCSwrite(reset_ch);;
halfpitch 0:decd8d14cc06 351 _spi.write(0xFF);
halfpitch 0:decd8d14cc06 352 return -1; // timeout
halfpitch 0:decd8d14cc06 353 }
halfpitch 0:decd8d14cc06 354
halfpitch 0:decd8d14cc06 355 int SDFileSystem::_read(char *buffer, int length) {
halfpitch 0:decd8d14cc06 356 _cs.wwCSwrite(ch_num);
halfpitch 0:decd8d14cc06 357
halfpitch 0:decd8d14cc06 358 // read until start byte (0xFF)
halfpitch 0:decd8d14cc06 359 while(_spi.write(0xFF) != 0xFE);
halfpitch 0:decd8d14cc06 360
halfpitch 0:decd8d14cc06 361 // read data
halfpitch 0:decd8d14cc06 362 for(int i=0; i<length; i++) {
halfpitch 0:decd8d14cc06 363 buffer[i] = _spi.write(0xFF);
halfpitch 0:decd8d14cc06 364 }
halfpitch 0:decd8d14cc06 365 _spi.write(0xFF); // checksum
halfpitch 0:decd8d14cc06 366 _spi.write(0xFF);
halfpitch 0:decd8d14cc06 367
halfpitch 0:decd8d14cc06 368 _cs.wwCSwrite(reset_ch);;
halfpitch 0:decd8d14cc06 369 _spi.write(0xFF);
halfpitch 0:decd8d14cc06 370 return 0;
halfpitch 0:decd8d14cc06 371 }
halfpitch 0:decd8d14cc06 372
halfpitch 0:decd8d14cc06 373 int SDFileSystem::_write(const char *buffer, int length) {
halfpitch 0:decd8d14cc06 374 _cs.wwCSwrite(ch_num);
halfpitch 0:decd8d14cc06 375
halfpitch 0:decd8d14cc06 376 // indicate start of block
halfpitch 0:decd8d14cc06 377 _spi.write(0xFE);
halfpitch 0:decd8d14cc06 378
halfpitch 0:decd8d14cc06 379 // write the data
halfpitch 0:decd8d14cc06 380 for(int i=0; i<length; i++) {
halfpitch 0:decd8d14cc06 381 _spi.write(buffer[i]);
halfpitch 0:decd8d14cc06 382 }
halfpitch 0:decd8d14cc06 383
halfpitch 0:decd8d14cc06 384 // write the checksum
halfpitch 0:decd8d14cc06 385 _spi.write(0xFF);
halfpitch 0:decd8d14cc06 386 _spi.write(0xFF);
halfpitch 0:decd8d14cc06 387
halfpitch 0:decd8d14cc06 388 // check the repsonse token
halfpitch 0:decd8d14cc06 389 if((_spi.write(0xFF) & 0x1F) != 0x05) {
halfpitch 0:decd8d14cc06 390 _cs.wwCSwrite(reset_ch);;
halfpitch 0:decd8d14cc06 391 _spi.write(0xFF);
halfpitch 0:decd8d14cc06 392 return 1;
halfpitch 0:decd8d14cc06 393 }
halfpitch 0:decd8d14cc06 394
halfpitch 0:decd8d14cc06 395 // wait for write to finish
halfpitch 0:decd8d14cc06 396 while(_spi.write(0xFF) == 0);
halfpitch 0:decd8d14cc06 397
halfpitch 0:decd8d14cc06 398 _cs.wwCSwrite(reset_ch);;
halfpitch 0:decd8d14cc06 399 _spi.write(0xFF);
halfpitch 0:decd8d14cc06 400 return 0;
halfpitch 0:decd8d14cc06 401 }
halfpitch 0:decd8d14cc06 402
halfpitch 0:decd8d14cc06 403 static int ext_bits(char *data, int msb, int lsb) {
halfpitch 0:decd8d14cc06 404 int bits = 0;
halfpitch 0:decd8d14cc06 405 int size = 1 + msb - lsb;
halfpitch 0:decd8d14cc06 406 for(int i=0; i<size; i++) {
halfpitch 0:decd8d14cc06 407 int position = lsb + i;
halfpitch 0:decd8d14cc06 408 int byte = 15 - (position >> 3);
halfpitch 0:decd8d14cc06 409 int bit = position & 0x7;
halfpitch 0:decd8d14cc06 410 int value = (data[byte] >> bit) & 1;
halfpitch 0:decd8d14cc06 411 bits |= value << i;
halfpitch 0:decd8d14cc06 412 }
halfpitch 0:decd8d14cc06 413 return bits;
halfpitch 0:decd8d14cc06 414 }
halfpitch 0:decd8d14cc06 415
halfpitch 0:decd8d14cc06 416 int SDFileSystem::_sd_sectors() {
halfpitch 0:decd8d14cc06 417
halfpitch 0:decd8d14cc06 418 // CMD9, Response R2 (R1 byte + 16-byte block read)
halfpitch 0:decd8d14cc06 419 if(_cmdx(9, 0) != 0) {
halfpitch 0:decd8d14cc06 420 fprintf(stderr, "Didn't get a response from the disk\n");
halfpitch 0:decd8d14cc06 421 return 0;
halfpitch 0:decd8d14cc06 422 }
halfpitch 0:decd8d14cc06 423
halfpitch 0:decd8d14cc06 424 char csd[16];
halfpitch 0:decd8d14cc06 425 if(_read(csd, 16) != 0) {
halfpitch 0:decd8d14cc06 426 fprintf(stderr, "Couldn't read csd response from disk\n");
halfpitch 0:decd8d14cc06 427 return 0;
halfpitch 0:decd8d14cc06 428 }
halfpitch 0:decd8d14cc06 429
halfpitch 0:decd8d14cc06 430 // csd_structure : csd[127:126]
halfpitch 0:decd8d14cc06 431 // c_size : csd[73:62]
halfpitch 0:decd8d14cc06 432 // c_size_mult : csd[49:47]
halfpitch 0:decd8d14cc06 433 // read_bl_len : csd[83:80] - the *maximum* read block length
halfpitch 0:decd8d14cc06 434
halfpitch 0:decd8d14cc06 435 int csd_structure = ext_bits(csd, 127, 126);
halfpitch 0:decd8d14cc06 436 int c_size = ext_bits(csd, 73, 62);
halfpitch 0:decd8d14cc06 437 int c_size_mult = ext_bits(csd, 49, 47);
halfpitch 0:decd8d14cc06 438 int read_bl_len = ext_bits(csd, 83, 80);
halfpitch 0:decd8d14cc06 439
halfpitch 0:decd8d14cc06 440 // printf("CSD_STRUCT = %d\n", csd_structure);
halfpitch 0:decd8d14cc06 441
halfpitch 0:decd8d14cc06 442 if(csd_structure != 0) {
halfpitch 0:decd8d14cc06 443 fprintf(stderr, "This disk tastes funny! I only know about type 0 CSD structures\n");
halfpitch 0:decd8d14cc06 444 return 0;
halfpitch 0:decd8d14cc06 445 }
halfpitch 0:decd8d14cc06 446
halfpitch 0:decd8d14cc06 447 // memory capacity = BLOCKNR * BLOCK_LEN
halfpitch 0:decd8d14cc06 448 // where
halfpitch 0:decd8d14cc06 449 // BLOCKNR = (C_SIZE+1) * MULT
halfpitch 0:decd8d14cc06 450 // MULT = 2^(C_SIZE_MULT+2) (C_SIZE_MULT < 8)
halfpitch 0:decd8d14cc06 451 // BLOCK_LEN = 2^READ_BL_LEN, (READ_BL_LEN < 12)
halfpitch 0:decd8d14cc06 452
halfpitch 0:decd8d14cc06 453 int block_len = 1 << read_bl_len;
halfpitch 0:decd8d14cc06 454 int mult = 1 << (c_size_mult + 2);
halfpitch 0:decd8d14cc06 455 int blocknr = (c_size + 1) * mult;
halfpitch 0:decd8d14cc06 456 int capacity = blocknr * block_len;
halfpitch 0:decd8d14cc06 457
halfpitch 0:decd8d14cc06 458 int blocks = capacity / 512;
halfpitch 0:decd8d14cc06 459
halfpitch 0:decd8d14cc06 460 return blocks;
halfpitch 0:decd8d14cc06 461 }