Suga koubou / Mbed 2 deprecated i2s_audio_madplayer

streo mp3 player see: http://mbed.org/users/okini3939/notebook/I2S_AUDIO

Dependencies:   FatFileSystemCpp I2SSlave TLV320 mbed

Fork of madplayer by Andreas Grün

SDHC_FileSystem/SDHCFileSystem.cpp@5:50015f4868e2, 2013-07-26 (annotated)

Committer:
okini3939
Date:
Fri Jul 26 15:02:49 2013 +0000
Revision:
5:50015f4868e2
fix

Who changed what in which revision?

UserRevisionLine numberNew contents of line
okini3939 5:50015f4868e2 1 /* mbed SDFileSystem Library, for providing file access to SD cards
okini3939 5:50015f4868e2 2 * Copyright (c) 2008-2010, sford
okini3939 5:50015f4868e2 3 *
okini3939 5:50015f4868e2 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
okini3939 5:50015f4868e2 5 * of this software and associated documentation files (the "Software"), to deal
okini3939 5:50015f4868e2 6 * in the Software without restriction, including without limitation the rights
okini3939 5:50015f4868e2 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
okini3939 5:50015f4868e2 8 * copies of the Software, and to permit persons to whom the Software is
okini3939 5:50015f4868e2 9 * furnished to do so, subject to the following conditions:
okini3939 5:50015f4868e2 10 *
okini3939 5:50015f4868e2 11 * The above copyright notice and this permission notice shall be included in
okini3939 5:50015f4868e2 12 * all copies or substantial portions of the Software.
okini3939 5:50015f4868e2 13 *
okini3939 5:50015f4868e2 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
okini3939 5:50015f4868e2 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
okini3939 5:50015f4868e2 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
okini3939 5:50015f4868e2 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
okini3939 5:50015f4868e2 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
okini3939 5:50015f4868e2 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
okini3939 5:50015f4868e2 20 * THE SOFTWARE.
okini3939 5:50015f4868e2 21 */
okini3939 5:50015f4868e2 22
okini3939 5:50015f4868e2 23 /* Introduction
okini3939 5:50015f4868e2 24 * ------------
okini3939 5:50015f4868e2 25 * SD and MMC cards support a number of interfaces, but common to them all
okini3939 5:50015f4868e2 26 * is one based on SPI. This is the one I'm implmenting because it means
okini3939 5:50015f4868e2 27 * it is much more portable even though not so performant, and we already
okini3939 5:50015f4868e2 28 * have the mbed SPI Interface!
okini3939 5:50015f4868e2 29 *
okini3939 5:50015f4868e2 30 * The main reference I'm using is Chapter 7, "SPI Mode" of:
okini3939 5:50015f4868e2 31 * http://www.sdcard.org/developers/tech/sdcard/pls/Simplified_Physical_Layer_Spec.pdf
okini3939 5:50015f4868e2 32 *
okini3939 5:50015f4868e2 33 * SPI Startup
okini3939 5:50015f4868e2 34 * -----------
okini3939 5:50015f4868e2 35 * The SD card powers up in SD mode. The SPI interface mode is selected by
okini3939 5:50015f4868e2 36 * asserting CS low and sending the reset command (CMD0). The card will
okini3939 5:50015f4868e2 37 * respond with a (R1) response.
okini3939 5:50015f4868e2 38 *
okini3939 5:50015f4868e2 39 * CMD8 is optionally sent to determine the voltage range supported, and
okini3939 5:50015f4868e2 40 * indirectly determine whether it is a version 1.x SD/non-SD card or
okini3939 5:50015f4868e2 41 * version 2.x. I'll just ignore this for now.
okini3939 5:50015f4868e2 42 *
okini3939 5:50015f4868e2 43 * ACMD41 is repeatedly issued to initialise the card, until "in idle"
okini3939 5:50015f4868e2 44 * (bit 0) of the R1 response goes to '0', indicating it is initialised.
okini3939 5:50015f4868e2 45 *
okini3939 5:50015f4868e2 46 * You should also indicate whether the host supports High Capicity cards,
okini3939 5:50015f4868e2 47 * and check whether the card is high capacity - i'll also ignore this
okini3939 5:50015f4868e2 48 *
okini3939 5:50015f4868e2 49 * SPI Protocol
okini3939 5:50015f4868e2 50 * ------------
okini3939 5:50015f4868e2 51 * The SD SPI protocol is based on transactions made up of 8-bit words, with
okini3939 5:50015f4868e2 52 * the host starting every bus transaction by asserting the CS signal low. The
okini3939 5:50015f4868e2 53 * card always responds to commands, data blocks and errors.
okini3939 5:50015f4868e2 54 *
okini3939 5:50015f4868e2 55 * The protocol supports a CRC, but by default it is off (except for the
okini3939 5:50015f4868e2 56 * first reset CMD0, where the CRC can just be pre-calculated, and CMD8)
okini3939 5:50015f4868e2 57 * I'll leave the CRC off I think!
okini3939 5:50015f4868e2 58 *
okini3939 5:50015f4868e2 59 * Standard capacity cards have variable data block sizes, whereas High
okini3939 5:50015f4868e2 60 * Capacity cards fix the size of data block to 512 bytes. I'll therefore
okini3939 5:50015f4868e2 61 * just always use the Standard Capacity cards with a block size of 512 bytes.
okini3939 5:50015f4868e2 62 * This is set with CMD16.
okini3939 5:50015f4868e2 63 *
okini3939 5:50015f4868e2 64 * You can read and write single blocks (CMD17, CMD25) or multiple blocks
okini3939 5:50015f4868e2 65 * (CMD18, CMD25). For simplicity, I'll just use single block accesses. When
okini3939 5:50015f4868e2 66 * the card gets a read command, it responds with a response token, and then
okini3939 5:50015f4868e2 67 * a data token or an error.
okini3939 5:50015f4868e2 68 *
okini3939 5:50015f4868e2 69 * SPI Command Format
okini3939 5:50015f4868e2 70 * ------------------
okini3939 5:50015f4868e2 71 * Commands are 6-bytes long, containing the command, 32-bit argument, and CRC.
okini3939 5:50015f4868e2 72 *
okini3939 5:50015f4868e2 73 * +---------------+------------+------------+-----------+----------+--------------+
okini3939 5:50015f4868e2 74 * | 01 | cmd[5:0] | arg[31:24] | arg[23:16] | arg[15:8] | arg[7:0] | crc[6:0] | 1 |
okini3939 5:50015f4868e2 75 * +---------------+------------+------------+-----------+----------+--------------+
okini3939 5:50015f4868e2 76 *
okini3939 5:50015f4868e2 77 * As I'm not using CRC, I can fix that byte to what is needed for CMD0 (0x95)
okini3939 5:50015f4868e2 78 *
okini3939 5:50015f4868e2 79 * All Application Specific commands shall be preceded with APP_CMD (CMD55).
okini3939 5:50015f4868e2 80 *
okini3939 5:50015f4868e2 81 * SPI Response Format
okini3939 5:50015f4868e2 82 * -------------------
okini3939 5:50015f4868e2 83 * The main response format (R1) is a status byte (normally zero). Key flags:
okini3939 5:50015f4868e2 84 * idle - 1 if the card is in an idle state/initialising
okini3939 5:50015f4868e2 85 * cmd - 1 if an illegal command code was detected
okini3939 5:50015f4868e2 86 *
okini3939 5:50015f4868e2 87 * +-------------------------------------------------+
okini3939 5:50015f4868e2 88 * R1 | 0 | arg | addr | seq | crc | cmd | erase | idle |
okini3939 5:50015f4868e2 89 * +-------------------------------------------------+
okini3939 5:50015f4868e2 90 *
okini3939 5:50015f4868e2 91 * R1b is the same, except it is followed by a busy signal (zeros) until
okini3939 5:50015f4868e2 92 * the first non-zero byte when it is ready again.
okini3939 5:50015f4868e2 93 *
okini3939 5:50015f4868e2 94 * Data Response Token
okini3939 5:50015f4868e2 95 * -------------------
okini3939 5:50015f4868e2 96 * Every data block written to the card is acknowledged by a byte
okini3939 5:50015f4868e2 97 * response token
okini3939 5:50015f4868e2 98 *
okini3939 5:50015f4868e2 99 * +----------------------+
okini3939 5:50015f4868e2 100 * | xxx | 0 | status | 1 |
okini3939 5:50015f4868e2 101 * +----------------------+
okini3939 5:50015f4868e2 102 * 010 - OK!
okini3939 5:50015f4868e2 103 * 101 - CRC Error
okini3939 5:50015f4868e2 104 * 110 - Write Error
okini3939 5:50015f4868e2 105 *
okini3939 5:50015f4868e2 106 * Single Block Read and Write
okini3939 5:50015f4868e2 107 * ---------------------------
okini3939 5:50015f4868e2 108 *
okini3939 5:50015f4868e2 109 * Block transfers have a byte header, followed by the data, followed
okini3939 5:50015f4868e2 110 * by a 16-bit CRC. In our case, the data will always be 512 bytes.
okini3939 5:50015f4868e2 111 *
okini3939 5:50015f4868e2 112 * +------+---------+---------+- - - -+---------+-----------+----------+
okini3939 5:50015f4868e2 113 * | 0xFE | data[0] | data[1] | | data[n] | crc[15:8] | crc[7:0] |
okini3939 5:50015f4868e2 114 * +------+---------+---------+- - - -+---------+-----------+----------+
okini3939 5:50015f4868e2 115 */
okini3939 5:50015f4868e2 116
okini3939 5:50015f4868e2 117 /*
okini3939 5:50015f4868e2 118 * Comment: Changes for SDHC support till 32GB
okini3939 5:50015f4868e2 119 * Name: KB
okini3939 5:50015f4868e2 120 * Date: 07/24/2010
okini3939 5:50015f4868e2 121 * Release: 0.1
okini3939 5:50015f4868e2 122 */
okini3939 5:50015f4868e2 123
okini3939 5:50015f4868e2 124 #include "SDHCFileSystem.h"
okini3939 5:50015f4868e2 125
okini3939 5:50015f4868e2 126 #define DEBUG
okini3939 5:50015f4868e2 127 #define SD_COMMAND_TIMEOUT 5000
okini3939 5:50015f4868e2 128
okini3939 5:50015f4868e2 129
okini3939 5:50015f4868e2 130 SDFileSystem::SDFileSystem(PinName mosi, PinName miso, PinName sclk, PinName cs, const char* name) :
okini3939 5:50015f4868e2 131 FATFileSystem(name), _spi(mosi, miso, sclk), _cs(cs) {
okini3939 5:50015f4868e2 132 _cs = 1;
okini3939 5:50015f4868e2 133 }
okini3939 5:50015f4868e2 134
okini3939 5:50015f4868e2 135 #define R1_IDLE_STATE (1 << 0)
okini3939 5:50015f4868e2 136 #define R1_ERASE_RESET (1 << 1)
okini3939 5:50015f4868e2 137 #define R1_ILLEGAL_COMMAND (1 << 2)
okini3939 5:50015f4868e2 138 #define R1_COM_CRC_ERROR (1 << 3)
okini3939 5:50015f4868e2 139 #define R1_ERASE_SEQUENCE_ERROR (1 << 4)
okini3939 5:50015f4868e2 140 #define R1_ADDRESS_ERROR (1 << 5)
okini3939 5:50015f4868e2 141 #define R1_PARAMETER_ERROR (1 << 6)
okini3939 5:50015f4868e2 142
okini3939 5:50015f4868e2 143 // Types
okini3939 5:50015f4868e2 144 // - v1.x Standard Capacity
okini3939 5:50015f4868e2 145 // - v2.x Standard Capacity
okini3939 5:50015f4868e2 146 // - v2.x High Capacity
okini3939 5:50015f4868e2 147 // - Not recognised as an SD Card
okini3939 5:50015f4868e2 148
okini3939 5:50015f4868e2 149 #define SDCARD_FAIL 0
okini3939 5:50015f4868e2 150 #define SDCARD_V1 1
okini3939 5:50015f4868e2 151 #define SDCARD_V2 2
okini3939 5:50015f4868e2 152 #define SDCARD_V2HC 3
okini3939 5:50015f4868e2 153
okini3939 5:50015f4868e2 154 int SDFileSystem::initialise_card() {
okini3939 5:50015f4868e2 155 // Set to 100kHz for initialisation, and clock card with cs = 1
okini3939 5:50015f4868e2 156 _spi.frequency(100000);
okini3939 5:50015f4868e2 157 _cs = 1;
okini3939 5:50015f4868e2 158 for(int i=0; i<16; i++) {
okini3939 5:50015f4868e2 159 _spi.write(0xFF);
okini3939 5:50015f4868e2 160 }
okini3939 5:50015f4868e2 161
okini3939 5:50015f4868e2 162 // send CMD0, should return with all zeros except IDLE STATE set (bit 0)
okini3939 5:50015f4868e2 163 if(_cmd(0, 0) != R1_IDLE_STATE) {
okini3939 5:50015f4868e2 164 fprintf(stderr, "No disk, or could not put SD card in to SPI idle state\n");
okini3939 5:50015f4868e2 165 return SDCARD_FAIL;
okini3939 5:50015f4868e2 166 }
okini3939 5:50015f4868e2 167
okini3939 5:50015f4868e2 168 // send CMD8 to determine whther it is ver 2.x
okini3939 5:50015f4868e2 169 int r = _cmd8();
okini3939 5:50015f4868e2 170 if(r == R1_IDLE_STATE) {
okini3939 5:50015f4868e2 171 return initialise_card_v2();
okini3939 5:50015f4868e2 172 } else if(r == (R1_IDLE_STATE | R1_ILLEGAL_COMMAND)) {
okini3939 5:50015f4868e2 173 return initialise_card_v1();
okini3939 5:50015f4868e2 174 } else {
okini3939 5:50015f4868e2 175 fprintf(stderr, "Not in idle state after sending CMD8 (not an SD card?)\n");
okini3939 5:50015f4868e2 176 return SDCARD_FAIL;
okini3939 5:50015f4868e2 177 }
okini3939 5:50015f4868e2 178 }
okini3939 5:50015f4868e2 179
okini3939 5:50015f4868e2 180 int SDFileSystem::initialise_card_v1() {
okini3939 5:50015f4868e2 181 for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
okini3939 5:50015f4868e2 182 _cmd(55, 0);
okini3939 5:50015f4868e2 183 if(_cmd(41, 0) == 0) {
okini3939 5:50015f4868e2 184 cdv = 512;
okini3939 5:50015f4868e2 185 #ifdef DEBUG
okini3939 5:50015f4868e2 186 printf("\n\rInit: SEDCARD_V1\n\r");
okini3939 5:50015f4868e2 187 #endif
okini3939 5:50015f4868e2 188 return SDCARD_V1;
okini3939 5:50015f4868e2 189 }
okini3939 5:50015f4868e2 190 }
okini3939 5:50015f4868e2 191
okini3939 5:50015f4868e2 192 fprintf(stderr, "Timeout waiting for v1.x card\n");
okini3939 5:50015f4868e2 193 return SDCARD_FAIL;
okini3939 5:50015f4868e2 194 }
okini3939 5:50015f4868e2 195
okini3939 5:50015f4868e2 196 int SDFileSystem::initialise_card_v2() {
okini3939 5:50015f4868e2 197
okini3939 5:50015f4868e2 198 for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
okini3939 5:50015f4868e2 199 wait_ms(50);
okini3939 5:50015f4868e2 200 _cmd58();
okini3939 5:50015f4868e2 201 _cmd(55, 0);
okini3939 5:50015f4868e2 202 if(_cmd(41, 0x40000000) == 0) {
okini3939 5:50015f4868e2 203 _cmd58();
okini3939 5:50015f4868e2 204 #ifdef DEBUG
okini3939 5:50015f4868e2 205 printf("\n\rInit: SDCARD_V2\n\r");
okini3939 5:50015f4868e2 206 #endif
okini3939 5:50015f4868e2 207 cdv = 1;
okini3939 5:50015f4868e2 208 return SDCARD_V2;
okini3939 5:50015f4868e2 209 }
okini3939 5:50015f4868e2 210 }
okini3939 5:50015f4868e2 211
okini3939 5:50015f4868e2 212 fprintf(stderr, "Timeout waiting for v2.x card\n");
okini3939 5:50015f4868e2 213 return SDCARD_FAIL;
okini3939 5:50015f4868e2 214 }
okini3939 5:50015f4868e2 215
okini3939 5:50015f4868e2 216 int SDFileSystem::disk_initialize() {
okini3939 5:50015f4868e2 217
okini3939 5:50015f4868e2 218 int i = initialise_card();
okini3939 5:50015f4868e2 219 #ifdef DEBUG
okini3939 5:50015f4868e2 220 printf("init card = %d\n", i);
okini3939 5:50015f4868e2 221 #endif
okini3939 5:50015f4868e2 222 _sectors = _sd_sectors();
okini3939 5:50015f4868e2 223
okini3939 5:50015f4868e2 224 // Set block length to 512 (CMD16)
okini3939 5:50015f4868e2 225 if(_cmd(16, 512) != 0) {
okini3939 5:50015f4868e2 226 fprintf(stderr, "Set 512-byte block timed out\n");
okini3939 5:50015f4868e2 227 return 1;
okini3939 5:50015f4868e2 228 }
okini3939 5:50015f4868e2 229
okini3939 5:50015f4868e2 230 _spi.frequency(16000000); // Set to 1MHz for data transfer
okini3939 5:50015f4868e2 231 return 0;
okini3939 5:50015f4868e2 232 }
okini3939 5:50015f4868e2 233
okini3939 5:50015f4868e2 234 int SDFileSystem::disk_write(const char *buffer, int block_number) {
okini3939 5:50015f4868e2 235 // set write address for single block (CMD24)
okini3939 5:50015f4868e2 236 if(_cmd(24, block_number * cdv) != 0) {
okini3939 5:50015f4868e2 237 return 1;
okini3939 5:50015f4868e2 238 }
okini3939 5:50015f4868e2 239
okini3939 5:50015f4868e2 240 // send the data block
okini3939 5:50015f4868e2 241 _write(buffer, 512);
okini3939 5:50015f4868e2 242 return 0;
okini3939 5:50015f4868e2 243 }
okini3939 5:50015f4868e2 244
okini3939 5:50015f4868e2 245 int SDFileSystem::disk_read(char *buffer, int block_number) {
okini3939 5:50015f4868e2 246 // set read address for single block (CMD17)
okini3939 5:50015f4868e2 247 if(_cmd(17, block_number * cdv) != 0) {
okini3939 5:50015f4868e2 248 return 1;
okini3939 5:50015f4868e2 249 }
okini3939 5:50015f4868e2 250
okini3939 5:50015f4868e2 251 // receive the data
okini3939 5:50015f4868e2 252 _read(buffer, 512);
okini3939 5:50015f4868e2 253 return 0;
okini3939 5:50015f4868e2 254 }
okini3939 5:50015f4868e2 255
okini3939 5:50015f4868e2 256 int SDFileSystem::disk_status() { return 0; }
okini3939 5:50015f4868e2 257 int SDFileSystem::disk_sync() { return 0; }
okini3939 5:50015f4868e2 258 int SDFileSystem::disk_sectors() { return _sectors; }
okini3939 5:50015f4868e2 259
okini3939 5:50015f4868e2 260 // PRIVATE FUNCTIONS
okini3939 5:50015f4868e2 261
okini3939 5:50015f4868e2 262 int SDFileSystem::_cmd(int cmd, int arg) {
okini3939 5:50015f4868e2 263 _cs = 0;
okini3939 5:50015f4868e2 264
okini3939 5:50015f4868e2 265 // send a command
okini3939 5:50015f4868e2 266 _spi.write(0x40 | cmd);
okini3939 5:50015f4868e2 267 _spi.write(arg >> 24);
okini3939 5:50015f4868e2 268 _spi.write(arg >> 16);
okini3939 5:50015f4868e2 269 _spi.write(arg >> 8);
okini3939 5:50015f4868e2 270 _spi.write(arg >> 0);
okini3939 5:50015f4868e2 271 _spi.write(0x95);
okini3939 5:50015f4868e2 272
okini3939 5:50015f4868e2 273 // wait for the repsonse (response[7] == 0)
okini3939 5:50015f4868e2 274 for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
okini3939 5:50015f4868e2 275 int response = _spi.write(0xFF);
okini3939 5:50015f4868e2 276 if(!(response & 0x80)) {
okini3939 5:50015f4868e2 277 _cs = 1;
okini3939 5:50015f4868e2 278 _spi.write(0xFF);
okini3939 5:50015f4868e2 279 return response;
okini3939 5:50015f4868e2 280 }
okini3939 5:50015f4868e2 281 }
okini3939 5:50015f4868e2 282 _cs = 1;
okini3939 5:50015f4868e2 283 _spi.write(0xFF);
okini3939 5:50015f4868e2 284 return -1; // timeout
okini3939 5:50015f4868e2 285 }
okini3939 5:50015f4868e2 286 int SDFileSystem::_cmdx(int cmd, int arg) {
okini3939 5:50015f4868e2 287 _cs = 0;
okini3939 5:50015f4868e2 288
okini3939 5:50015f4868e2 289 // send a command
okini3939 5:50015f4868e2 290 _spi.write(0x40 | cmd);
okini3939 5:50015f4868e2 291 _spi.write(arg >> 24);
okini3939 5:50015f4868e2 292 _spi.write(arg >> 16);
okini3939 5:50015f4868e2 293 _spi.write(arg >> 8);
okini3939 5:50015f4868e2 294 _spi.write(arg >> 0);
okini3939 5:50015f4868e2 295 _spi.write(0x95);
okini3939 5:50015f4868e2 296
okini3939 5:50015f4868e2 297 // wait for the repsonse (response[7] == 0)
okini3939 5:50015f4868e2 298 for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
okini3939 5:50015f4868e2 299 int response = _spi.write(0xFF);
okini3939 5:50015f4868e2 300 if(!(response & 0x80)) {
okini3939 5:50015f4868e2 301 return response;
okini3939 5:50015f4868e2 302 }
okini3939 5:50015f4868e2 303 }
okini3939 5:50015f4868e2 304 _cs = 1;
okini3939 5:50015f4868e2 305 _spi.write(0xFF);
okini3939 5:50015f4868e2 306 return -1; // timeout
okini3939 5:50015f4868e2 307 }
okini3939 5:50015f4868e2 308
okini3939 5:50015f4868e2 309
okini3939 5:50015f4868e2 310 int SDFileSystem::_cmd58() {
okini3939 5:50015f4868e2 311 _cs = 0;
okini3939 5:50015f4868e2 312 int arg = 0;
okini3939 5:50015f4868e2 313
okini3939 5:50015f4868e2 314 // send a command
okini3939 5:50015f4868e2 315 _spi.write(0x40 | 58);
okini3939 5:50015f4868e2 316 _spi.write(arg >> 24);
okini3939 5:50015f4868e2 317 _spi.write(arg >> 16);
okini3939 5:50015f4868e2 318 _spi.write(arg >> 8);
okini3939 5:50015f4868e2 319 _spi.write(arg >> 0);
okini3939 5:50015f4868e2 320 _spi.write(0x95);
okini3939 5:50015f4868e2 321
okini3939 5:50015f4868e2 322 // wait for the repsonse (response[7] == 0)
okini3939 5:50015f4868e2 323 for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
okini3939 5:50015f4868e2 324 int response = _spi.write(0xFF);
okini3939 5:50015f4868e2 325 if(!(response & 0x80)) {
okini3939 5:50015f4868e2 326 int ocr = _spi.write(0xFF) << 24;
okini3939 5:50015f4868e2 327 ocr |= _spi.write(0xFF) << 16;
okini3939 5:50015f4868e2 328 ocr |= _spi.write(0xFF) << 8;
okini3939 5:50015f4868e2 329 ocr |= _spi.write(0xFF) << 0;
okini3939 5:50015f4868e2 330 // printf("OCR = 0x%08X\n", ocr);
okini3939 5:50015f4868e2 331 _cs = 1;
okini3939 5:50015f4868e2 332 _spi.write(0xFF);
okini3939 5:50015f4868e2 333 return response;
okini3939 5:50015f4868e2 334 }
okini3939 5:50015f4868e2 335 }
okini3939 5:50015f4868e2 336 _cs = 1;
okini3939 5:50015f4868e2 337 _spi.write(0xFF);
okini3939 5:50015f4868e2 338 return -1; // timeout
okini3939 5:50015f4868e2 339 }
okini3939 5:50015f4868e2 340
okini3939 5:50015f4868e2 341 int SDFileSystem::_cmd8() {
okini3939 5:50015f4868e2 342 _cs = 0;
okini3939 5:50015f4868e2 343
okini3939 5:50015f4868e2 344 // send a command
okini3939 5:50015f4868e2 345 _spi.write(0x40 | 8); // CMD8
okini3939 5:50015f4868e2 346 _spi.write(0x00); // reserved
okini3939 5:50015f4868e2 347 _spi.write(0x00); // reserved
okini3939 5:50015f4868e2 348 _spi.write(0x01); // 3.3v
okini3939 5:50015f4868e2 349 _spi.write(0xAA); // check pattern
okini3939 5:50015f4868e2 350 _spi.write(0x87); // crc
okini3939 5:50015f4868e2 351
okini3939 5:50015f4868e2 352 // wait for the repsonse (response[7] == 0)
okini3939 5:50015f4868e2 353 for(int i=0; i<SD_COMMAND_TIMEOUT * 1000; i++) {
okini3939 5:50015f4868e2 354 char response[5];
okini3939 5:50015f4868e2 355 response[0] = _spi.write(0xFF);
okini3939 5:50015f4868e2 356 if(!(response[0] & 0x80)) {
okini3939 5:50015f4868e2 357 for(int j=1; j<5; j++) {
okini3939 5:50015f4868e2 358 response[i] = _spi.write(0xFF);
okini3939 5:50015f4868e2 359 }
okini3939 5:50015f4868e2 360 _cs = 1;
okini3939 5:50015f4868e2 361 _spi.write(0xFF);
okini3939 5:50015f4868e2 362 return response[0];
okini3939 5:50015f4868e2 363 }
okini3939 5:50015f4868e2 364 }
okini3939 5:50015f4868e2 365 _cs = 1;
okini3939 5:50015f4868e2 366 _spi.write(0xFF);
okini3939 5:50015f4868e2 367 return -1; // timeout
okini3939 5:50015f4868e2 368 }
okini3939 5:50015f4868e2 369
okini3939 5:50015f4868e2 370 int SDFileSystem::_read(char *buffer, int length) {
okini3939 5:50015f4868e2 371 _cs = 0;
okini3939 5:50015f4868e2 372
okini3939 5:50015f4868e2 373 // read until start byte (0xFF)
okini3939 5:50015f4868e2 374 while(_spi.write(0xFF) != 0xFE);
okini3939 5:50015f4868e2 375
okini3939 5:50015f4868e2 376 // read data
okini3939 5:50015f4868e2 377 for(int i=0; i<length; i++) {
okini3939 5:50015f4868e2 378 buffer[i] = _spi.write(0xFF);
okini3939 5:50015f4868e2 379 }
okini3939 5:50015f4868e2 380 _spi.write(0xFF); // checksum
okini3939 5:50015f4868e2 381 _spi.write(0xFF);
okini3939 5:50015f4868e2 382
okini3939 5:50015f4868e2 383 _cs = 1;
okini3939 5:50015f4868e2 384 _spi.write(0xFF);
okini3939 5:50015f4868e2 385 return 0;
okini3939 5:50015f4868e2 386 }
okini3939 5:50015f4868e2 387
okini3939 5:50015f4868e2 388 int SDFileSystem::_write(const char *buffer, int length) {
okini3939 5:50015f4868e2 389 _cs = 0;
okini3939 5:50015f4868e2 390
okini3939 5:50015f4868e2 391 // indicate start of block
okini3939 5:50015f4868e2 392 _spi.write(0xFE);
okini3939 5:50015f4868e2 393
okini3939 5:50015f4868e2 394 // write the data
okini3939 5:50015f4868e2 395 for(int i=0; i<length; i++) {
okini3939 5:50015f4868e2 396 _spi.write(buffer[i]);
okini3939 5:50015f4868e2 397 }
okini3939 5:50015f4868e2 398
okini3939 5:50015f4868e2 399 // write the checksum
okini3939 5:50015f4868e2 400 _spi.write(0xFF);
okini3939 5:50015f4868e2 401 _spi.write(0xFF);
okini3939 5:50015f4868e2 402
okini3939 5:50015f4868e2 403 // check the repsonse token
okini3939 5:50015f4868e2 404 if((_spi.write(0xFF) & 0x1F) != 0x05) {
okini3939 5:50015f4868e2 405 _cs = 1;
okini3939 5:50015f4868e2 406 _spi.write(0xFF);
okini3939 5:50015f4868e2 407 return 1;
okini3939 5:50015f4868e2 408 }
okini3939 5:50015f4868e2 409
okini3939 5:50015f4868e2 410 // wait for write to finish
okini3939 5:50015f4868e2 411 while(_spi.write(0xFF) == 0);
okini3939 5:50015f4868e2 412
okini3939 5:50015f4868e2 413 _cs = 1;
okini3939 5:50015f4868e2 414 _spi.write(0xFF);
okini3939 5:50015f4868e2 415 return 0;
okini3939 5:50015f4868e2 416 }
okini3939 5:50015f4868e2 417
okini3939 5:50015f4868e2 418 static int ext_bits(char *data, int msb, int lsb) {
okini3939 5:50015f4868e2 419 int bits = 0;
okini3939 5:50015f4868e2 420 int size = 1 + msb - lsb;
okini3939 5:50015f4868e2 421 for(int i=0; i<size; i++) {
okini3939 5:50015f4868e2 422 int position = lsb + i;
okini3939 5:50015f4868e2 423 int byte = 15 - (position >> 3);
okini3939 5:50015f4868e2 424 int bit = position & 0x7;
okini3939 5:50015f4868e2 425 int value = (data[byte] >> bit) & 1;
okini3939 5:50015f4868e2 426 bits |= value << i;
okini3939 5:50015f4868e2 427 }
okini3939 5:50015f4868e2 428 return bits;
okini3939 5:50015f4868e2 429 }
okini3939 5:50015f4868e2 430
okini3939 5:50015f4868e2 431 int SDFileSystem::_sd_sectors() {
okini3939 5:50015f4868e2 432
okini3939 5:50015f4868e2 433 int c_size, c_size_mult, read_bl_len;
okini3939 5:50015f4868e2 434 int block_len, mult, blocknr, capacity;
okini3939 5:50015f4868e2 435 int blocks, hc_c_size;
okini3939 5:50015f4868e2 436 uint64_t hc_capacity;
okini3939 5:50015f4868e2 437
okini3939 5:50015f4868e2 438 // CMD9, Response R2 (R1 byte + 16-byte block read)
okini3939 5:50015f4868e2 439 if(_cmdx(9, 0) != 0) {
okini3939 5:50015f4868e2 440 fprintf(stderr, "Didn't get a response from the disk\n");
okini3939 5:50015f4868e2 441 return 0;
okini3939 5:50015f4868e2 442 }
okini3939 5:50015f4868e2 443
okini3939 5:50015f4868e2 444 char csd[16];
okini3939 5:50015f4868e2 445 if(_read(csd, 16) != 0) {
okini3939 5:50015f4868e2 446 fprintf(stderr, "Couldn't read csd response from disk\n");
okini3939 5:50015f4868e2 447 return 0;
okini3939 5:50015f4868e2 448 }
okini3939 5:50015f4868e2 449
okini3939 5:50015f4868e2 450 // csd_structure : csd[127:126]
okini3939 5:50015f4868e2 451 // c_size : csd[73:62]
okini3939 5:50015f4868e2 452 // c_size_mult : csd[49:47]
okini3939 5:50015f4868e2 453 // read_bl_len : csd[83:80] - the *maximum* read block length
okini3939 5:50015f4868e2 454
okini3939 5:50015f4868e2 455 int csd_structure = ext_bits(csd, 127, 126);
okini3939 5:50015f4868e2 456
okini3939 5:50015f4868e2 457 #ifdef DEBUG
okini3939 5:50015f4868e2 458 printf("\n\rCSD_STRUCT = %d\n", csd_structure);
okini3939 5:50015f4868e2 459 #endif
okini3939 5:50015f4868e2 460
okini3939 5:50015f4868e2 461 switch (csd_structure){
okini3939 5:50015f4868e2 462 case 0:
okini3939 5:50015f4868e2 463 cdv = 512;
okini3939 5:50015f4868e2 464 c_size = ext_bits(csd, 73, 62);
okini3939 5:50015f4868e2 465 c_size_mult = ext_bits(csd, 49, 47);
okini3939 5:50015f4868e2 466 read_bl_len = ext_bits(csd, 83, 80);
okini3939 5:50015f4868e2 467
okini3939 5:50015f4868e2 468 block_len = 1 << read_bl_len;
okini3939 5:50015f4868e2 469 mult = 1 << (c_size_mult + 2);
okini3939 5:50015f4868e2 470 blocknr = (c_size + 1) * mult;
okini3939 5:50015f4868e2 471 capacity = blocknr * block_len;
okini3939 5:50015f4868e2 472 blocks = capacity / 512;
okini3939 5:50015f4868e2 473 #ifdef DEBUG
okini3939 5:50015f4868e2 474 printf("\n\rSDCard\n\rc_size: %.4X \n\rcapacity: %.ld \n\rsectors: %d\n\r", c_size, capacity, blocks);
okini3939 5:50015f4868e2 475 #endif
okini3939 5:50015f4868e2 476 break;
okini3939 5:50015f4868e2 477
okini3939 5:50015f4868e2 478 case 1:
okini3939 5:50015f4868e2 479 cdv = 1;
okini3939 5:50015f4868e2 480 hc_c_size = ext_bits(csd, 63, 48);
okini3939 5:50015f4868e2 481 int hc_read_bl_len = ext_bits(csd, 83, 80);
okini3939 5:50015f4868e2 482 hc_capacity = hc_c_size+1;
okini3939 5:50015f4868e2 483 blocks = (hc_c_size+1)*1024;
okini3939 5:50015f4868e2 484 #ifdef DEBUG
okini3939 5:50015f4868e2 485 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);
okini3939 5:50015f4868e2 486 #endif
okini3939 5:50015f4868e2 487 break;
okini3939 5:50015f4868e2 488
okini3939 5:50015f4868e2 489 default:
okini3939 5:50015f4868e2 490 fprintf(stderr, "This disk tastes funny! I only know about type 0 CSD structures\n");
okini3939 5:50015f4868e2 491 return 0;
okini3939 5:50015f4868e2 492 break;
okini3939 5:50015f4868e2 493 };
okini3939 5:50015f4868e2 494 return blocks;
okini3939 5:50015f4868e2 495 }