James Novak / Mbed 2 deprecated MS-DigoleTest

test code megasquirt and digole lcd

Dependencies:   FatFileSystem mbed

SDFileSystem.cpp@0:7ea8f0d27a4f, 2015-11-27 (annotated)

Committer:
jpnovak
Date:
Fri Nov 27 16:32:41 2015 +0000
Revision:
0:7ea8f0d27a4f
test code megasquirt digole;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jpnovak 0:7ea8f0d27a4f 1 /* mbed SDFileSystem Library, for providing file access to SD cards
jpnovak 0:7ea8f0d27a4f 2 * Copyright (c) 2008-2010, sford
jpnovak 0:7ea8f0d27a4f 3 *
jpnovak 0:7ea8f0d27a4f 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
jpnovak 0:7ea8f0d27a4f 5 * of this software and associated documentation files (the "Software"), to deal
jpnovak 0:7ea8f0d27a4f 6 * in the Software without restriction, including without limitation the rights
jpnovak 0:7ea8f0d27a4f 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
jpnovak 0:7ea8f0d27a4f 8 * copies of the Software, and to permit persons to whom the Software is
jpnovak 0:7ea8f0d27a4f 9 * furnished to do so, subject to the following conditions:
jpnovak 0:7ea8f0d27a4f 10 *
jpnovak 0:7ea8f0d27a4f 11 * The above copyright notice and this permission notice shall be included in
jpnovak 0:7ea8f0d27a4f 12 * all copies or substantial portions of the Software.
jpnovak 0:7ea8f0d27a4f 13 *
jpnovak 0:7ea8f0d27a4f 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
jpnovak 0:7ea8f0d27a4f 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
jpnovak 0:7ea8f0d27a4f 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
jpnovak 0:7ea8f0d27a4f 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
jpnovak 0:7ea8f0d27a4f 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
jpnovak 0:7ea8f0d27a4f 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
jpnovak 0:7ea8f0d27a4f 20 * THE SOFTWARE.
jpnovak 0:7ea8f0d27a4f 21 */
jpnovak 0:7ea8f0d27a4f 22
jpnovak 0:7ea8f0d27a4f 23 /* Introduction
jpnovak 0:7ea8f0d27a4f 24 * ------------
jpnovak 0:7ea8f0d27a4f 25 * SD and MMC cards support a number of interfaces, but common to them all
jpnovak 0:7ea8f0d27a4f 26 * is one based on SPI. This is the one I'm implmenting because it means
jpnovak 0:7ea8f0d27a4f 27 * it is much more portable even though not so performant, and we already
jpnovak 0:7ea8f0d27a4f 28 * have the mbed SPI Interface!
jpnovak 0:7ea8f0d27a4f 29 *
jpnovak 0:7ea8f0d27a4f 30 * The main reference I'm using is Chapter 7, "SPI Mode" of:
jpnovak 0:7ea8f0d27a4f 31 * http://www.sdcard.org/developers/tech/sdcard/pls/Simplified_Physical_Layer_Spec.pdf
jpnovak 0:7ea8f0d27a4f 32 *
jpnovak 0:7ea8f0d27a4f 33 * SPI Startup
jpnovak 0:7ea8f0d27a4f 34 * -----------
jpnovak 0:7ea8f0d27a4f 35 * The SD card powers up in SD mode. The SPI interface mode is selected by
jpnovak 0:7ea8f0d27a4f 36 * asserting CS low and sending the reset command (CMD0). The card will
jpnovak 0:7ea8f0d27a4f 37 * respond with a (R1) response.
jpnovak 0:7ea8f0d27a4f 38 *
jpnovak 0:7ea8f0d27a4f 39 * CMD8 is optionally sent to determine the voltage range supported, and
jpnovak 0:7ea8f0d27a4f 40 * indirectly determine whether it is a version 1.x SD/non-SD card or
jpnovak 0:7ea8f0d27a4f 41 * version 2.x. I'll just ignore this for now.
jpnovak 0:7ea8f0d27a4f 42 *
jpnovak 0:7ea8f0d27a4f 43 * ACMD41 is repeatedly issued to initialise the card, until "in idle"
jpnovak 0:7ea8f0d27a4f 44 * (bit 0) of the R1 response goes to '0', indicating it is initialised.
jpnovak 0:7ea8f0d27a4f 45 *
jpnovak 0:7ea8f0d27a4f 46 * You should also indicate whether the host supports High Capicity cards,
jpnovak 0:7ea8f0d27a4f 47 * and check whether the card is high capacity - i'll also ignore this
jpnovak 0:7ea8f0d27a4f 48 *
jpnovak 0:7ea8f0d27a4f 49 * SPI Protocol
jpnovak 0:7ea8f0d27a4f 50 * ------------
jpnovak 0:7ea8f0d27a4f 51 * The SD SPI protocol is based on transactions made up of 8-bit words, with
jpnovak 0:7ea8f0d27a4f 52 * the host starting every bus transaction by asserting the CS signal low. The
jpnovak 0:7ea8f0d27a4f 53 * card always responds to commands, data blocks and errors.
jpnovak 0:7ea8f0d27a4f 54 *
jpnovak 0:7ea8f0d27a4f 55 * The protocol supports a CRC, but by default it is off (except for the
jpnovak 0:7ea8f0d27a4f 56 * first reset CMD0, where the CRC can just be pre-calculated, and CMD8)
jpnovak 0:7ea8f0d27a4f 57 * I'll leave the CRC off I think!
jpnovak 0:7ea8f0d27a4f 58 *
jpnovak 0:7ea8f0d27a4f 59 * Standard capacity cards have variable data block sizes, whereas High
jpnovak 0:7ea8f0d27a4f 60 * Capacity cards fix the size of data block to 512 bytes. I'll therefore
jpnovak 0:7ea8f0d27a4f 61 * just always use the Standard Capacity cards with a block size of 512 bytes.
jpnovak 0:7ea8f0d27a4f 62 * This is set with CMD16.
jpnovak 0:7ea8f0d27a4f 63 *
jpnovak 0:7ea8f0d27a4f 64 * You can read and write single blocks (CMD17, CMD25) or multiple blocks
jpnovak 0:7ea8f0d27a4f 65 * (CMD18, CMD25). For simplicity, I'll just use single block accesses. When
jpnovak 0:7ea8f0d27a4f 66 * the card gets a read command, it responds with a response token, and then
jpnovak 0:7ea8f0d27a4f 67 * a data token or an error.
jpnovak 0:7ea8f0d27a4f 68 *
jpnovak 0:7ea8f0d27a4f 69 * SPI Command Format
jpnovak 0:7ea8f0d27a4f 70 * ------------------
jpnovak 0:7ea8f0d27a4f 71 * Commands are 6-bytes long, containing the command, 32-bit argument, and CRC.
jpnovak 0:7ea8f0d27a4f 72 *
jpnovak 0:7ea8f0d27a4f 73 * +---------------+------------+------------+-----------+----------+--------------+
jpnovak 0:7ea8f0d27a4f 74 * | 01 | cmd[5:0] | arg[31:24] | arg[23:16] | arg[15:8] | arg[7:0] | crc[6:0] | 1 |
jpnovak 0:7ea8f0d27a4f 75 * +---------------+------------+------------+-----------+----------+--------------+
jpnovak 0:7ea8f0d27a4f 76 *
jpnovak 0:7ea8f0d27a4f 77 * As I'm not using CRC, I can fix that byte to what is needed for CMD0 (0x95)
jpnovak 0:7ea8f0d27a4f 78 *
jpnovak 0:7ea8f0d27a4f 79 * All Application Specific commands shall be preceded with APP_CMD (CMD55).
jpnovak 0:7ea8f0d27a4f 80 *
jpnovak 0:7ea8f0d27a4f 81 * SPI Response Format
jpnovak 0:7ea8f0d27a4f 82 * -------------------
jpnovak 0:7ea8f0d27a4f 83 * The main response format (R1) is a status byte (normally zero). Key flags:
jpnovak 0:7ea8f0d27a4f 84 * idle - 1 if the card is in an idle state/initialising
jpnovak 0:7ea8f0d27a4f 85 * cmd - 1 if an illegal command code was detected
jpnovak 0:7ea8f0d27a4f 86 *
jpnovak 0:7ea8f0d27a4f 87 * +-------------------------------------------------+
jpnovak 0:7ea8f0d27a4f 88 * R1 | 0 | arg | addr | seq | crc | cmd | erase | idle |
jpnovak 0:7ea8f0d27a4f 89 * +-------------------------------------------------+
jpnovak 0:7ea8f0d27a4f 90 *
jpnovak 0:7ea8f0d27a4f 91 * R1b is the same, except it is followed by a busy signal (zeros) until
jpnovak 0:7ea8f0d27a4f 92 * the first non-zero byte when it is ready again.
jpnovak 0:7ea8f0d27a4f 93 *
jpnovak 0:7ea8f0d27a4f 94 * Data Response Token
jpnovak 0:7ea8f0d27a4f 95 * -------------------
jpnovak 0:7ea8f0d27a4f 96 * Every data block written to the card is acknowledged by a byte
jpnovak 0:7ea8f0d27a4f 97 * response token
jpnovak 0:7ea8f0d27a4f 98 *
jpnovak 0:7ea8f0d27a4f 99 * +----------------------+
jpnovak 0:7ea8f0d27a4f 100 * | xxx | 0 | status | 1 |
jpnovak 0:7ea8f0d27a4f 101 * +----------------------+
jpnovak 0:7ea8f0d27a4f 102 * 010 - OK!
jpnovak 0:7ea8f0d27a4f 103 * 101 - CRC Error
jpnovak 0:7ea8f0d27a4f 104 * 110 - Write Error
jpnovak 0:7ea8f0d27a4f 105 *
jpnovak 0:7ea8f0d27a4f 106 * Single Block Read and Write
jpnovak 0:7ea8f0d27a4f 107 * ---------------------------
jpnovak 0:7ea8f0d27a4f 108 *
jpnovak 0:7ea8f0d27a4f 109 * Block transfers have a byte header, followed by the data, followed
jpnovak 0:7ea8f0d27a4f 110 * by a 16-bit CRC. In our case, the data will always be 512 bytes.
jpnovak 0:7ea8f0d27a4f 111 *
jpnovak 0:7ea8f0d27a4f 112 * +------+---------+---------+- - - -+---------+-----------+----------+
jpnovak 0:7ea8f0d27a4f 113 * | 0xFE | data[0] | data[1] | | data[n] | crc[15:8] | crc[7:0] |
jpnovak 0:7ea8f0d27a4f 114 * +------+---------+---------+- - - -+---------+-----------+----------+
jpnovak 0:7ea8f0d27a4f 115 */
jpnovak 0:7ea8f0d27a4f 116
jpnovak 0:7ea8f0d27a4f 117 #include "SDFileSystem.h"
jpnovak 0:7ea8f0d27a4f 118
jpnovak 0:7ea8f0d27a4f 119 #define SD_COMMAND_TIMEOUT 5000
jpnovak 0:7ea8f0d27a4f 120
jpnovak 0:7ea8f0d27a4f 121 SDFileSystem::SDFileSystem(PinName mosi, PinName miso, PinName sclk, PinName cs, const char* name) :
jpnovak 0:7ea8f0d27a4f 122 FATFileSystem(name), _spi(mosi, miso, sclk), _cs(cs) {
jpnovak 0:7ea8f0d27a4f 123 _cs = 1;
jpnovak 0:7ea8f0d27a4f 124 }
jpnovak 0:7ea8f0d27a4f 125
jpnovak 0:7ea8f0d27a4f 126 #define R1_IDLE_STATE (1 << 0)
jpnovak 0:7ea8f0d27a4f 127 #define R1_ERASE_RESET (1 << 1)
jpnovak 0:7ea8f0d27a4f 128 #define R1_ILLEGAL_COMMAND (1 << 2)
jpnovak 0:7ea8f0d27a4f 129 #define R1_COM_CRC_ERROR (1 << 3)
jpnovak 0:7ea8f0d27a4f 130 #define R1_ERASE_SEQUENCE_ERROR (1 << 4)
jpnovak 0:7ea8f0d27a4f 131 #define R1_ADDRESS_ERROR (1 << 5)
jpnovak 0:7ea8f0d27a4f 132 #define R1_PARAMETER_ERROR (1 << 6)
jpnovak 0:7ea8f0d27a4f 133
jpnovak 0:7ea8f0d27a4f 134 // Types
jpnovak 0:7ea8f0d27a4f 135 // - v1.x Standard Capacity
jpnovak 0:7ea8f0d27a4f 136 // - v2.x Standard Capacity
jpnovak 0:7ea8f0d27a4f 137 // - v2.x High Capacity
jpnovak 0:7ea8f0d27a4f 138 // - Not recognised as an SD Card
jpnovak 0:7ea8f0d27a4f 139
jpnovak 0:7ea8f0d27a4f 140 #define SDCARD_FAIL 0
jpnovak 0:7ea8f0d27a4f 141 #define SDCARD_V1 1
jpnovak 0:7ea8f0d27a4f 142 #define SDCARD_V2 2
jpnovak 0:7ea8f0d27a4f 143 #define SDCARD_V2HC 3
jpnovak 0:7ea8f0d27a4f 144
jpnovak 0:7ea8f0d27a4f 145 int SDFileSystem::initialise_card() {
jpnovak 0:7ea8f0d27a4f 146 // Set to 100kHz for initialisation, and clock card with cs = 1
jpnovak 0:7ea8f0d27a4f 147 _spi.frequency(100000);
jpnovak 0:7ea8f0d27a4f 148 _cs = 1;
jpnovak 0:7ea8f0d27a4f 149 for(int i=0; i<16; i++) {
jpnovak 0:7ea8f0d27a4f 150 _spi.write(0xFF);
jpnovak 0:7ea8f0d27a4f 151 }
jpnovak 0:7ea8f0d27a4f 152
jpnovak 0:7ea8f0d27a4f 153 // send CMD0, should return with all zeros except IDLE STATE set (bit 0)
jpnovak 0:7ea8f0d27a4f 154 if(_cmd(0, 0) != R1_IDLE_STATE) {
jpnovak 0:7ea8f0d27a4f 155 fprintf(stderr, "No disk, or could not put SD card in to SPI idle state\n");
jpnovak 0:7ea8f0d27a4f 156 return SDCARD_FAIL;
jpnovak 0:7ea8f0d27a4f 157 }
jpnovak 0:7ea8f0d27a4f 158
jpnovak 0:7ea8f0d27a4f 159 // send CMD8 to determine whther it is ver 2.x
jpnovak 0:7ea8f0d27a4f 160 int r = _cmd8();
jpnovak 0:7ea8f0d27a4f 161 if(r == R1_IDLE_STATE) {
jpnovak 0:7ea8f0d27a4f 162 return initialise_card_v2();
jpnovak 0:7ea8f0d27a4f 163 } else if(r == (R1_IDLE_STATE | R1_ILLEGAL_COMMAND)) {
jpnovak 0:7ea8f0d27a4f 164 return initialise_card_v1();
jpnovak 0:7ea8f0d27a4f 165 } else {
jpnovak 0:7ea8f0d27a4f 166 fprintf(stderr, "Not in idle state after sending CMD8 (not an SD card?)\n");
jpnovak 0:7ea8f0d27a4f 167 return SDCARD_FAIL;
jpnovak 0:7ea8f0d27a4f 168 }
jpnovak 0:7ea8f0d27a4f 169 }
jpnovak 0:7ea8f0d27a4f 170
jpnovak 0:7ea8f0d27a4f 171 int SDFileSystem::initialise_card_v1() {
jpnovak 0:7ea8f0d27a4f 172 for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
jpnovak 0:7ea8f0d27a4f 173 _cmd(55, 0);
jpnovak 0:7ea8f0d27a4f 174 if(_cmd(41, 0) == 0) {
jpnovak 0:7ea8f0d27a4f 175 return SDCARD_V1;
jpnovak 0:7ea8f0d27a4f 176 }
jpnovak 0:7ea8f0d27a4f 177 }
jpnovak 0:7ea8f0d27a4f 178
jpnovak 0:7ea8f0d27a4f 179 fprintf(stderr, "Timeout waiting for v1.x card\n");
jpnovak 0:7ea8f0d27a4f 180 return SDCARD_FAIL;
jpnovak 0:7ea8f0d27a4f 181 }
jpnovak 0:7ea8f0d27a4f 182
jpnovak 0:7ea8f0d27a4f 183 int SDFileSystem::initialise_card_v2() {
jpnovak 0:7ea8f0d27a4f 184
jpnovak 0:7ea8f0d27a4f 185 for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
jpnovak 0:7ea8f0d27a4f 186 _cmd(55, 0);
jpnovak 0:7ea8f0d27a4f 187 if(_cmd(41, 0) == 0) {
jpnovak 0:7ea8f0d27a4f 188 _cmd58();
jpnovak 0:7ea8f0d27a4f 189 return SDCARD_V2;
jpnovak 0:7ea8f0d27a4f 190 }
jpnovak 0:7ea8f0d27a4f 191 }
jpnovak 0:7ea8f0d27a4f 192
jpnovak 0:7ea8f0d27a4f 193 fprintf(stderr, "Timeout waiting for v2.x card\n");
jpnovak 0:7ea8f0d27a4f 194 return SDCARD_FAIL;
jpnovak 0:7ea8f0d27a4f 195 }
jpnovak 0:7ea8f0d27a4f 196
jpnovak 0:7ea8f0d27a4f 197 int SDFileSystem::disk_initialize() {
jpnovak 0:7ea8f0d27a4f 198
jpnovak 0:7ea8f0d27a4f 199 int i = initialise_card();
jpnovak 0:7ea8f0d27a4f 200 // printf("init card = %d\n", i);
jpnovak 0:7ea8f0d27a4f 201 // printf("OK\n");
jpnovak 0:7ea8f0d27a4f 202
jpnovak 0:7ea8f0d27a4f 203 _sectors = _sd_sectors();
jpnovak 0:7ea8f0d27a4f 204
jpnovak 0:7ea8f0d27a4f 205 // Set block length to 512 (CMD16)
jpnovak 0:7ea8f0d27a4f 206 if(_cmd(16, 512) != 0) {
jpnovak 0:7ea8f0d27a4f 207 fprintf(stderr, "Set 512-byte block timed out\n");
jpnovak 0:7ea8f0d27a4f 208 return 1;
jpnovak 0:7ea8f0d27a4f 209 }
jpnovak 0:7ea8f0d27a4f 210
jpnovak 0:7ea8f0d27a4f 211 _spi.frequency(1000000); // Set to 1MHz for data transfer
jpnovak 0:7ea8f0d27a4f 212 return 0;
jpnovak 0:7ea8f0d27a4f 213 }
jpnovak 0:7ea8f0d27a4f 214
jpnovak 0:7ea8f0d27a4f 215 int SDFileSystem::disk_write(const char *buffer, int block_number) {
jpnovak 0:7ea8f0d27a4f 216 // set write address for single block (CMD24)
jpnovak 0:7ea8f0d27a4f 217 if(_cmd(24, block_number * 512) != 0) {
jpnovak 0:7ea8f0d27a4f 218 return 1;
jpnovak 0:7ea8f0d27a4f 219 }
jpnovak 0:7ea8f0d27a4f 220
jpnovak 0:7ea8f0d27a4f 221 // send the data block
jpnovak 0:7ea8f0d27a4f 222 _write(buffer, 512);
jpnovak 0:7ea8f0d27a4f 223 return 0;
jpnovak 0:7ea8f0d27a4f 224 }
jpnovak 0:7ea8f0d27a4f 225
jpnovak 0:7ea8f0d27a4f 226 int SDFileSystem::disk_read(char *buffer, int block_number) {
jpnovak 0:7ea8f0d27a4f 227 // set read address for single block (CMD17)
jpnovak 0:7ea8f0d27a4f 228 if(_cmd(17, block_number * 512) != 0) {
jpnovak 0:7ea8f0d27a4f 229 return 1;
jpnovak 0:7ea8f0d27a4f 230 }
jpnovak 0:7ea8f0d27a4f 231
jpnovak 0:7ea8f0d27a4f 232 // receive the data
jpnovak 0:7ea8f0d27a4f 233 _read(buffer, 512);
jpnovak 0:7ea8f0d27a4f 234 return 0;
jpnovak 0:7ea8f0d27a4f 235 }
jpnovak 0:7ea8f0d27a4f 236
jpnovak 0:7ea8f0d27a4f 237 int SDFileSystem::disk_status() { return 0; }
jpnovak 0:7ea8f0d27a4f 238 int SDFileSystem::disk_sync() { return 0; }
jpnovak 0:7ea8f0d27a4f 239 int SDFileSystem::disk_sectors() { return _sectors; }
jpnovak 0:7ea8f0d27a4f 240
jpnovak 0:7ea8f0d27a4f 241 // PRIVATE FUNCTIONS
jpnovak 0:7ea8f0d27a4f 242
jpnovak 0:7ea8f0d27a4f 243 int SDFileSystem::_cmd(int cmd, int arg) {
jpnovak 0:7ea8f0d27a4f 244 _cs = 0;
jpnovak 0:7ea8f0d27a4f 245
jpnovak 0:7ea8f0d27a4f 246 // send a command
jpnovak 0:7ea8f0d27a4f 247 _spi.write(0x40 | cmd);
jpnovak 0:7ea8f0d27a4f 248 _spi.write(arg >> 24);
jpnovak 0:7ea8f0d27a4f 249 _spi.write(arg >> 16);
jpnovak 0:7ea8f0d27a4f 250 _spi.write(arg >> 8);
jpnovak 0:7ea8f0d27a4f 251 _spi.write(arg >> 0);
jpnovak 0:7ea8f0d27a4f 252 _spi.write(0x95);
jpnovak 0:7ea8f0d27a4f 253
jpnovak 0:7ea8f0d27a4f 254 // wait for the repsonse (response[7] == 0)
jpnovak 0:7ea8f0d27a4f 255 for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
jpnovak 0:7ea8f0d27a4f 256 int response = _spi.write(0xFF);
jpnovak 0:7ea8f0d27a4f 257 if(!(response & 0x80)) {
jpnovak 0:7ea8f0d27a4f 258 _cs = 1;
jpnovak 0:7ea8f0d27a4f 259 _spi.write(0xFF);
jpnovak 0:7ea8f0d27a4f 260 return response;
jpnovak 0:7ea8f0d27a4f 261 }
jpnovak 0:7ea8f0d27a4f 262 }
jpnovak 0:7ea8f0d27a4f 263 _cs = 1;
jpnovak 0:7ea8f0d27a4f 264 _spi.write(0xFF);
jpnovak 0:7ea8f0d27a4f 265 return -1; // timeout
jpnovak 0:7ea8f0d27a4f 266 }
jpnovak 0:7ea8f0d27a4f 267 int SDFileSystem::_cmdx(int cmd, int arg) {
jpnovak 0:7ea8f0d27a4f 268 _cs = 0;
jpnovak 0:7ea8f0d27a4f 269
jpnovak 0:7ea8f0d27a4f 270 // send a command
jpnovak 0:7ea8f0d27a4f 271 _spi.write(0x40 | cmd);
jpnovak 0:7ea8f0d27a4f 272 _spi.write(arg >> 24);
jpnovak 0:7ea8f0d27a4f 273 _spi.write(arg >> 16);
jpnovak 0:7ea8f0d27a4f 274 _spi.write(arg >> 8);
jpnovak 0:7ea8f0d27a4f 275 _spi.write(arg >> 0);
jpnovak 0:7ea8f0d27a4f 276 _spi.write(0x95);
jpnovak 0:7ea8f0d27a4f 277
jpnovak 0:7ea8f0d27a4f 278 // wait for the repsonse (response[7] == 0)
jpnovak 0:7ea8f0d27a4f 279 for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
jpnovak 0:7ea8f0d27a4f 280 int response = _spi.write(0xFF);
jpnovak 0:7ea8f0d27a4f 281 if(!(response & 0x80)) {
jpnovak 0:7ea8f0d27a4f 282 return response;
jpnovak 0:7ea8f0d27a4f 283 }
jpnovak 0:7ea8f0d27a4f 284 }
jpnovak 0:7ea8f0d27a4f 285 _cs = 1;
jpnovak 0:7ea8f0d27a4f 286 _spi.write(0xFF);
jpnovak 0:7ea8f0d27a4f 287 return -1; // timeout
jpnovak 0:7ea8f0d27a4f 288 }
jpnovak 0:7ea8f0d27a4f 289
jpnovak 0:7ea8f0d27a4f 290
jpnovak 0:7ea8f0d27a4f 291 int SDFileSystem::_cmd58() {
jpnovak 0:7ea8f0d27a4f 292 _cs = 0;
jpnovak 0:7ea8f0d27a4f 293 int arg = 0;
jpnovak 0:7ea8f0d27a4f 294
jpnovak 0:7ea8f0d27a4f 295 // send a command
jpnovak 0:7ea8f0d27a4f 296 _spi.write(0x40 | 58);
jpnovak 0:7ea8f0d27a4f 297 _spi.write(arg >> 24);
jpnovak 0:7ea8f0d27a4f 298 _spi.write(arg >> 16);
jpnovak 0:7ea8f0d27a4f 299 _spi.write(arg >> 8);
jpnovak 0:7ea8f0d27a4f 300 _spi.write(arg >> 0);
jpnovak 0:7ea8f0d27a4f 301 _spi.write(0x95);
jpnovak 0:7ea8f0d27a4f 302
jpnovak 0:7ea8f0d27a4f 303 // wait for the repsonse (response[7] == 0)
jpnovak 0:7ea8f0d27a4f 304 for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
jpnovak 0:7ea8f0d27a4f 305 int response = _spi.write(0xFF);
jpnovak 0:7ea8f0d27a4f 306 if(!(response & 0x80)) {
jpnovak 0:7ea8f0d27a4f 307 int ocr = _spi.write(0xFF) << 24;
jpnovak 0:7ea8f0d27a4f 308 ocr |= _spi.write(0xFF) << 16;
jpnovak 0:7ea8f0d27a4f 309 ocr |= _spi.write(0xFF) << 8;
jpnovak 0:7ea8f0d27a4f 310 ocr |= _spi.write(0xFF) << 0;
jpnovak 0:7ea8f0d27a4f 311 // printf("OCR = 0x%08X\n", ocr);
jpnovak 0:7ea8f0d27a4f 312 _cs = 1;
jpnovak 0:7ea8f0d27a4f 313 _spi.write(0xFF);
jpnovak 0:7ea8f0d27a4f 314 return response;
jpnovak 0:7ea8f0d27a4f 315 }
jpnovak 0:7ea8f0d27a4f 316 }
jpnovak 0:7ea8f0d27a4f 317 _cs = 1;
jpnovak 0:7ea8f0d27a4f 318 _spi.write(0xFF);
jpnovak 0:7ea8f0d27a4f 319 return -1; // timeout
jpnovak 0:7ea8f0d27a4f 320 }
jpnovak 0:7ea8f0d27a4f 321
jpnovak 0:7ea8f0d27a4f 322 int SDFileSystem::_cmd8() {
jpnovak 0:7ea8f0d27a4f 323 _cs = 0;
jpnovak 0:7ea8f0d27a4f 324
jpnovak 0:7ea8f0d27a4f 325 // send a command
jpnovak 0:7ea8f0d27a4f 326 _spi.write(0x40 | 8); // CMD8
jpnovak 0:7ea8f0d27a4f 327 _spi.write(0x00); // reserved
jpnovak 0:7ea8f0d27a4f 328 _spi.write(0x00); // reserved
jpnovak 0:7ea8f0d27a4f 329 _spi.write(0x01); // 3.3v
jpnovak 0:7ea8f0d27a4f 330 _spi.write(0xAA); // check pattern
jpnovak 0:7ea8f0d27a4f 331 _spi.write(0x87); // crc
jpnovak 0:7ea8f0d27a4f 332
jpnovak 0:7ea8f0d27a4f 333 // wait for the repsonse (response[7] == 0)
jpnovak 0:7ea8f0d27a4f 334 for(int i=0; i<SD_COMMAND_TIMEOUT * 1000; i++) {
jpnovak 0:7ea8f0d27a4f 335 char response[5];
jpnovak 0:7ea8f0d27a4f 336 response[0] = _spi.write(0xFF);
jpnovak 0:7ea8f0d27a4f 337 if(!(response[0] & 0x80)) {
jpnovak 0:7ea8f0d27a4f 338 for(int j=1; j<5; j++) {
jpnovak 0:7ea8f0d27a4f 339 response[i] = _spi.write(0xFF);
jpnovak 0:7ea8f0d27a4f 340 }
jpnovak 0:7ea8f0d27a4f 341 _cs = 1;
jpnovak 0:7ea8f0d27a4f 342 _spi.write(0xFF);
jpnovak 0:7ea8f0d27a4f 343 return response[0];
jpnovak 0:7ea8f0d27a4f 344 }
jpnovak 0:7ea8f0d27a4f 345 }
jpnovak 0:7ea8f0d27a4f 346 _cs = 1;
jpnovak 0:7ea8f0d27a4f 347 _spi.write(0xFF);
jpnovak 0:7ea8f0d27a4f 348 return -1; // timeout
jpnovak 0:7ea8f0d27a4f 349 }
jpnovak 0:7ea8f0d27a4f 350
jpnovak 0:7ea8f0d27a4f 351 int SDFileSystem::_read(char *buffer, int length) {
jpnovak 0:7ea8f0d27a4f 352 _cs = 0;
jpnovak 0:7ea8f0d27a4f 353
jpnovak 0:7ea8f0d27a4f 354 // read until start byte (0xFF)
jpnovak 0:7ea8f0d27a4f 355 while(_spi.write(0xFF) != 0xFE);
jpnovak 0:7ea8f0d27a4f 356
jpnovak 0:7ea8f0d27a4f 357 // read data
jpnovak 0:7ea8f0d27a4f 358 for(int i=0; i<length; i++) {
jpnovak 0:7ea8f0d27a4f 359 buffer[i] = _spi.write(0xFF);
jpnovak 0:7ea8f0d27a4f 360 }
jpnovak 0:7ea8f0d27a4f 361 _spi.write(0xFF); // checksum
jpnovak 0:7ea8f0d27a4f 362 _spi.write(0xFF);
jpnovak 0:7ea8f0d27a4f 363
jpnovak 0:7ea8f0d27a4f 364 _cs = 1;
jpnovak 0:7ea8f0d27a4f 365 _spi.write(0xFF);
jpnovak 0:7ea8f0d27a4f 366 return 0;
jpnovak 0:7ea8f0d27a4f 367 }
jpnovak 0:7ea8f0d27a4f 368
jpnovak 0:7ea8f0d27a4f 369 int SDFileSystem::_write(const char *buffer, int length) {
jpnovak 0:7ea8f0d27a4f 370 _cs = 0;
jpnovak 0:7ea8f0d27a4f 371
jpnovak 0:7ea8f0d27a4f 372 // indicate start of block
jpnovak 0:7ea8f0d27a4f 373 _spi.write(0xFE);
jpnovak 0:7ea8f0d27a4f 374
jpnovak 0:7ea8f0d27a4f 375 // write the data
jpnovak 0:7ea8f0d27a4f 376 for(int i=0; i<length; i++) {
jpnovak 0:7ea8f0d27a4f 377 _spi.write(buffer[i]);
jpnovak 0:7ea8f0d27a4f 378 }
jpnovak 0:7ea8f0d27a4f 379
jpnovak 0:7ea8f0d27a4f 380 // write the checksum
jpnovak 0:7ea8f0d27a4f 381 _spi.write(0xFF);
jpnovak 0:7ea8f0d27a4f 382 _spi.write(0xFF);
jpnovak 0:7ea8f0d27a4f 383
jpnovak 0:7ea8f0d27a4f 384 // check the repsonse token
jpnovak 0:7ea8f0d27a4f 385 if((_spi.write(0xFF) & 0x1F) != 0x05) {
jpnovak 0:7ea8f0d27a4f 386 _cs = 1;
jpnovak 0:7ea8f0d27a4f 387 _spi.write(0xFF);
jpnovak 0:7ea8f0d27a4f 388 return 1;
jpnovak 0:7ea8f0d27a4f 389 }
jpnovak 0:7ea8f0d27a4f 390
jpnovak 0:7ea8f0d27a4f 391 // wait for write to finish
jpnovak 0:7ea8f0d27a4f 392 while(_spi.write(0xFF) == 0);
jpnovak 0:7ea8f0d27a4f 393
jpnovak 0:7ea8f0d27a4f 394 _cs = 1;
jpnovak 0:7ea8f0d27a4f 395 _spi.write(0xFF);
jpnovak 0:7ea8f0d27a4f 396 return 0;
jpnovak 0:7ea8f0d27a4f 397 }
jpnovak 0:7ea8f0d27a4f 398
jpnovak 0:7ea8f0d27a4f 399 static int ext_bits(char *data, int msb, int lsb) {
jpnovak 0:7ea8f0d27a4f 400 int bits = 0;
jpnovak 0:7ea8f0d27a4f 401 int size = 1 + msb - lsb;
jpnovak 0:7ea8f0d27a4f 402 for(int i=0; i<size; i++) {
jpnovak 0:7ea8f0d27a4f 403 int position = lsb + i;
jpnovak 0:7ea8f0d27a4f 404 int byte = 15 - (position >> 3);
jpnovak 0:7ea8f0d27a4f 405 int bit = position & 0x7;
jpnovak 0:7ea8f0d27a4f 406 int value = (data[byte] >> bit) & 1;
jpnovak 0:7ea8f0d27a4f 407 bits |= value << i;
jpnovak 0:7ea8f0d27a4f 408 }
jpnovak 0:7ea8f0d27a4f 409 return bits;
jpnovak 0:7ea8f0d27a4f 410 }
jpnovak 0:7ea8f0d27a4f 411
jpnovak 0:7ea8f0d27a4f 412 int SDFileSystem::_sd_sectors() {
jpnovak 0:7ea8f0d27a4f 413
jpnovak 0:7ea8f0d27a4f 414 // CMD9, Response R2 (R1 byte + 16-byte block read)
jpnovak 0:7ea8f0d27a4f 415 if(_cmdx(9, 0) != 0) {
jpnovak 0:7ea8f0d27a4f 416 fprintf(stderr, "Didn't get a response from the disk\n");
jpnovak 0:7ea8f0d27a4f 417 return 0;
jpnovak 0:7ea8f0d27a4f 418 }
jpnovak 0:7ea8f0d27a4f 419
jpnovak 0:7ea8f0d27a4f 420 char csd[16];
jpnovak 0:7ea8f0d27a4f 421 if(_read(csd, 16) != 0) {
jpnovak 0:7ea8f0d27a4f 422 fprintf(stderr, "Couldn't read csd response from disk\n");
jpnovak 0:7ea8f0d27a4f 423 return 0;
jpnovak 0:7ea8f0d27a4f 424 }
jpnovak 0:7ea8f0d27a4f 425
jpnovak 0:7ea8f0d27a4f 426 // csd_structure : csd[127:126]
jpnovak 0:7ea8f0d27a4f 427 // c_size : csd[73:62]
jpnovak 0:7ea8f0d27a4f 428 // c_size_mult : csd[49:47]
jpnovak 0:7ea8f0d27a4f 429 // read_bl_len : csd[83:80] - the *maximum* read block length
jpnovak 0:7ea8f0d27a4f 430
jpnovak 0:7ea8f0d27a4f 431 int csd_structure = ext_bits(csd, 127, 126);
jpnovak 0:7ea8f0d27a4f 432 int c_size = ext_bits(csd, 73, 62);
jpnovak 0:7ea8f0d27a4f 433 int c_size_mult = ext_bits(csd, 49, 47);
jpnovak 0:7ea8f0d27a4f 434 int read_bl_len = ext_bits(csd, 83, 80);
jpnovak 0:7ea8f0d27a4f 435
jpnovak 0:7ea8f0d27a4f 436 // printf("CSD_STRUCT = %d\n", csd_structure);
jpnovak 0:7ea8f0d27a4f 437
jpnovak 0:7ea8f0d27a4f 438 if(csd_structure != 0) {
jpnovak 0:7ea8f0d27a4f 439 fprintf(stderr, "This disk tastes funny! I only know about type 0 CSD structures\n");
jpnovak 0:7ea8f0d27a4f 440 return 0;
jpnovak 0:7ea8f0d27a4f 441 }
jpnovak 0:7ea8f0d27a4f 442
jpnovak 0:7ea8f0d27a4f 443 // memory capacity = BLOCKNR * BLOCK_LEN
jpnovak 0:7ea8f0d27a4f 444 // where
jpnovak 0:7ea8f0d27a4f 445 // BLOCKNR = (C_SIZE+1) * MULT
jpnovak 0:7ea8f0d27a4f 446 // MULT = 2^(C_SIZE_MULT+2) (C_SIZE_MULT < 8)
jpnovak 0:7ea8f0d27a4f 447 // BLOCK_LEN = 2^READ_BL_LEN, (READ_BL_LEN < 12)
jpnovak 0:7ea8f0d27a4f 448
jpnovak 0:7ea8f0d27a4f 449 int block_len = 1 << read_bl_len;
jpnovak 0:7ea8f0d27a4f 450 int mult = 1 << (c_size_mult + 2);
jpnovak 0:7ea8f0d27a4f 451 int blocknr = (c_size + 1) * mult;
jpnovak 0:7ea8f0d27a4f 452 int capacity = blocknr * block_len;
jpnovak 0:7ea8f0d27a4f 453
jpnovak 0:7ea8f0d27a4f 454 int blocks = capacity / 512;
jpnovak 0:7ea8f0d27a4f 455
jpnovak 0:7ea8f0d27a4f 456 return blocks;
jpnovak 0:7ea8f0d27a4f 457 }