Gina Holden / Mbed 2 deprecated IoTAlarmSystem

IoT Alarm System with pushbutton for door, webpage for viewing status, and keypad for disabling alarm.

Dependencies:   PinDetect mbed wave_player FATFileSystem

Fork of ESP8266-WEB-Mbed-LPC1768-Controller by jim hamblen

SDFileSystem/SDFileSystem.cpp@6:d5b6ab598544, 2016-03-17 (annotated)

Committer:
gholden3
Date:
Thu Mar 17 12:52:43 2016 +0000
Revision:
6:d5b6ab598544
Parent:
5:28e4c7315a20 
fix library dependencies;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
gholden3 5:28e4c7315a20 1 /* mbed Microcontroller Library
gholden3 5:28e4c7315a20 2 * Copyright (c) 2006-2012 ARM Limited
gholden3 5:28e4c7315a20 3 *
gholden3 5:28e4c7315a20 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
gholden3 5:28e4c7315a20 5 * of this software and associated documentation files (the "Software"), to deal
gholden3 5:28e4c7315a20 6 * in the Software without restriction, including without limitation the rights
gholden3 5:28e4c7315a20 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
gholden3 5:28e4c7315a20 8 * copies of the Software, and to permit persons to whom the Software is
gholden3 5:28e4c7315a20 9 * furnished to do so, subject to the following conditions:
gholden3 5:28e4c7315a20 10 *
gholden3 5:28e4c7315a20 11 * The above copyright notice and this permission notice shall be included in
gholden3 5:28e4c7315a20 12 * all copies or substantial portions of the Software.
gholden3 5:28e4c7315a20 13 *
gholden3 5:28e4c7315a20 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
gholden3 5:28e4c7315a20 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
gholden3 5:28e4c7315a20 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
gholden3 5:28e4c7315a20 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
gholden3 5:28e4c7315a20 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
gholden3 5:28e4c7315a20 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
gholden3 5:28e4c7315a20 20 * SOFTWARE.
gholden3 5:28e4c7315a20 21 */
gholden3 5:28e4c7315a20 22 /* Introduction
gholden3 5:28e4c7315a20 23 * ------------
gholden3 5:28e4c7315a20 24 * SD and MMC cards support a number of interfaces, but common to them all
gholden3 5:28e4c7315a20 25 * is one based on SPI. This is the one I'm implmenting because it means
gholden3 5:28e4c7315a20 26 * it is much more portable even though not so performant, and we already
gholden3 5:28e4c7315a20 27 * have the mbed SPI Interface!
gholden3 5:28e4c7315a20 28 *
gholden3 5:28e4c7315a20 29 * The main reference I'm using is Chapter 7, "SPI Mode" of:
gholden3 5:28e4c7315a20 30 * http://www.sdcard.org/developers/tech/sdcard/pls/Simplified_Physical_Layer_Spec.pdf
gholden3 5:28e4c7315a20 31 *
gholden3 5:28e4c7315a20 32 * SPI Startup
gholden3 5:28e4c7315a20 33 * -----------
gholden3 5:28e4c7315a20 34 * The SD card powers up in SD mode. The SPI interface mode is selected by
gholden3 5:28e4c7315a20 35 * asserting CS low and sending the reset command (CMD0). The card will
gholden3 5:28e4c7315a20 36 * respond with a (R1) response.
gholden3 5:28e4c7315a20 37 *
gholden3 5:28e4c7315a20 38 * CMD8 is optionally sent to determine the voltage range supported, and
gholden3 5:28e4c7315a20 39 * indirectly determine whether it is a version 1.x SD/non-SD card or
gholden3 5:28e4c7315a20 40 * version 2.x. I'll just ignore this for now.
gholden3 5:28e4c7315a20 41 *
gholden3 5:28e4c7315a20 42 * ACMD41 is repeatedly issued to initialise the card, until "in idle"
gholden3 5:28e4c7315a20 43 * (bit 0) of the R1 response goes to '0', indicating it is initialised.
gholden3 5:28e4c7315a20 44 *
gholden3 5:28e4c7315a20 45 * You should also indicate whether the host supports High Capicity cards,
gholden3 5:28e4c7315a20 46 * and check whether the card is high capacity - i'll also ignore this
gholden3 5:28e4c7315a20 47 *
gholden3 5:28e4c7315a20 48 * SPI Protocol
gholden3 5:28e4c7315a20 49 * ------------
gholden3 5:28e4c7315a20 50 * The SD SPI protocol is based on transactions made up of 8-bit words, with
gholden3 5:28e4c7315a20 51 * the host starting every bus transaction by asserting the CS signal low. The
gholden3 5:28e4c7315a20 52 * card always responds to commands, data blocks and errors.
gholden3 5:28e4c7315a20 53 *
gholden3 5:28e4c7315a20 54 * The protocol supports a CRC, but by default it is off (except for the
gholden3 5:28e4c7315a20 55 * first reset CMD0, where the CRC can just be pre-calculated, and CMD8)
gholden3 5:28e4c7315a20 56 * I'll leave the CRC off I think!
gholden3 5:28e4c7315a20 57 *
gholden3 5:28e4c7315a20 58 * Standard capacity cards have variable data block sizes, whereas High
gholden3 5:28e4c7315a20 59 * Capacity cards fix the size of data block to 512 bytes. I'll therefore
gholden3 5:28e4c7315a20 60 * just always use the Standard Capacity cards with a block size of 512 bytes.
gholden3 5:28e4c7315a20 61 * This is set with CMD16.
gholden3 5:28e4c7315a20 62 *
gholden3 5:28e4c7315a20 63 * You can read and write single blocks (CMD17, CMD25) or multiple blocks
gholden3 5:28e4c7315a20 64 * (CMD18, CMD25). For simplicity, I'll just use single block accesses. When
gholden3 5:28e4c7315a20 65 * the card gets a read command, it responds with a response token, and then
gholden3 5:28e4c7315a20 66 * a data token or an error.
gholden3 5:28e4c7315a20 67 *
gholden3 5:28e4c7315a20 68 * SPI Command Format
gholden3 5:28e4c7315a20 69 * ------------------
gholden3 5:28e4c7315a20 70 * Commands are 6-bytes long, containing the command, 32-bit argument, and CRC.
gholden3 5:28e4c7315a20 71 *
gholden3 5:28e4c7315a20 72 * +---------------+------------+------------+-----------+----------+--------------+
gholden3 5:28e4c7315a20 73 * | 01 | cmd[5:0] | arg[31:24] | arg[23:16] | arg[15:8] | arg[7:0] | crc[6:0] | 1 |
gholden3 5:28e4c7315a20 74 * +---------------+------------+------------+-----------+----------+--------------+
gholden3 5:28e4c7315a20 75 *
gholden3 5:28e4c7315a20 76 * As I'm not using CRC, I can fix that byte to what is needed for CMD0 (0x95)
gholden3 5:28e4c7315a20 77 *
gholden3 5:28e4c7315a20 78 * All Application Specific commands shall be preceded with APP_CMD (CMD55).
gholden3 5:28e4c7315a20 79 *
gholden3 5:28e4c7315a20 80 * SPI Response Format
gholden3 5:28e4c7315a20 81 * -------------------
gholden3 5:28e4c7315a20 82 * The main response format (R1) is a status byte (normally zero). Key flags:
gholden3 5:28e4c7315a20 83 * idle - 1 if the card is in an idle state/initialising
gholden3 5:28e4c7315a20 84 * cmd - 1 if an illegal command code was detected
gholden3 5:28e4c7315a20 85 *
gholden3 5:28e4c7315a20 86 * +-------------------------------------------------+
gholden3 5:28e4c7315a20 87 * R1 | 0 | arg | addr | seq | crc | cmd | erase | idle |
gholden3 5:28e4c7315a20 88 * +-------------------------------------------------+
gholden3 5:28e4c7315a20 89 *
gholden3 5:28e4c7315a20 90 * R1b is the same, except it is followed by a busy signal (zeros) until
gholden3 5:28e4c7315a20 91 * the first non-zero byte when it is ready again.
gholden3 5:28e4c7315a20 92 *
gholden3 5:28e4c7315a20 93 * Data Response Token
gholden3 5:28e4c7315a20 94 * -------------------
gholden3 5:28e4c7315a20 95 * Every data block written to the card is acknowledged by a byte
gholden3 5:28e4c7315a20 96 * response token
gholden3 5:28e4c7315a20 97 *
gholden3 5:28e4c7315a20 98 * +----------------------+
gholden3 5:28e4c7315a20 99 * | xxx | 0 | status | 1 |
gholden3 5:28e4c7315a20 100 * +----------------------+
gholden3 5:28e4c7315a20 101 * 010 - OK!
gholden3 5:28e4c7315a20 102 * 101 - CRC Error
gholden3 5:28e4c7315a20 103 * 110 - Write Error
gholden3 5:28e4c7315a20 104 *
gholden3 5:28e4c7315a20 105 * Single Block Read and Write
gholden3 5:28e4c7315a20 106 * ---------------------------
gholden3 5:28e4c7315a20 107 *
gholden3 5:28e4c7315a20 108 * Block transfers have a byte header, followed by the data, followed
gholden3 5:28e4c7315a20 109 * by a 16-bit CRC. In our case, the data will always be 512 bytes.
gholden3 5:28e4c7315a20 110 *
gholden3 5:28e4c7315a20 111 * +------+---------+---------+- - - -+---------+-----------+----------+
gholden3 5:28e4c7315a20 112 * | 0xFE | data[0] | data[1] | | data[n] | crc[15:8] | crc[7:0] |
gholden3 5:28e4c7315a20 113 * +------+---------+---------+- - - -+---------+-----------+----------+
gholden3 5:28e4c7315a20 114 */
gholden3 5:28e4c7315a20 115 #include "SDFileSystem.h"
gholden3 5:28e4c7315a20 116 #include "mbed_debug.h"
gholden3 5:28e4c7315a20 117
gholden3 5:28e4c7315a20 118 #define SD_COMMAND_TIMEOUT 5000
gholden3 5:28e4c7315a20 119
gholden3 5:28e4c7315a20 120 #define SD_DBG 0
gholden3 5:28e4c7315a20 121
gholden3 5:28e4c7315a20 122 SDFileSystem::SDFileSystem(PinName mosi, PinName miso, PinName sclk, PinName cs, const char* name) :
gholden3 5:28e4c7315a20 123 FATFileSystem(name), _spi(mosi, miso, sclk), _cs(cs) {
gholden3 5:28e4c7315a20 124 _cs = 1;
gholden3 5:28e4c7315a20 125 }
gholden3 5:28e4c7315a20 126
gholden3 5:28e4c7315a20 127 #define R1_IDLE_STATE (1 << 0)
gholden3 5:28e4c7315a20 128 #define R1_ERASE_RESET (1 << 1)
gholden3 5:28e4c7315a20 129 #define R1_ILLEGAL_COMMAND (1 << 2)
gholden3 5:28e4c7315a20 130 #define R1_COM_CRC_ERROR (1 << 3)
gholden3 5:28e4c7315a20 131 #define R1_ERASE_SEQUENCE_ERROR (1 << 4)
gholden3 5:28e4c7315a20 132 #define R1_ADDRESS_ERROR (1 << 5)
gholden3 5:28e4c7315a20 133 #define R1_PARAMETER_ERROR (1 << 6)
gholden3 5:28e4c7315a20 134
gholden3 5:28e4c7315a20 135 // Types
gholden3 5:28e4c7315a20 136 // - v1.x Standard Capacity
gholden3 5:28e4c7315a20 137 // - v2.x Standard Capacity
gholden3 5:28e4c7315a20 138 // - v2.x High Capacity
gholden3 5:28e4c7315a20 139 // - Not recognised as an SD Card
gholden3 5:28e4c7315a20 140 #define SDCARD_FAIL 0
gholden3 5:28e4c7315a20 141 #define SDCARD_V1 1
gholden3 5:28e4c7315a20 142 #define SDCARD_V2 2
gholden3 5:28e4c7315a20 143 #define SDCARD_V2HC 3
gholden3 5:28e4c7315a20 144
gholden3 5:28e4c7315a20 145 int SDFileSystem::initialise_card() {
gholden3 5:28e4c7315a20 146 // Set to 100kHz for initialisation, and clock card with cs = 1
gholden3 5:28e4c7315a20 147 _spi.frequency(100000);
gholden3 5:28e4c7315a20 148 _cs = 1;
gholden3 5:28e4c7315a20 149 for (int i = 0; i < 16; i++) {
gholden3 5:28e4c7315a20 150 _spi.write(0xFF);
gholden3 5:28e4c7315a20 151 }
gholden3 5:28e4c7315a20 152
gholden3 5:28e4c7315a20 153 // send CMD0, should return with all zeros except IDLE STATE set (bit 0)
gholden3 5:28e4c7315a20 154 if (_cmd(0, 0) != R1_IDLE_STATE) {
gholden3 5:28e4c7315a20 155 debug("No disk, or could not put SD card in to SPI idle state\n");
gholden3 5:28e4c7315a20 156 return SDCARD_FAIL;
gholden3 5:28e4c7315a20 157 }
gholden3 5:28e4c7315a20 158
gholden3 5:28e4c7315a20 159 // send CMD8 to determine whther it is ver 2.x
gholden3 5:28e4c7315a20 160 int r = _cmd8();
gholden3 5:28e4c7315a20 161 if (r == R1_IDLE_STATE) {
gholden3 5:28e4c7315a20 162 return initialise_card_v2();
gholden3 5:28e4c7315a20 163 } else if (r == (R1_IDLE_STATE | R1_ILLEGAL_COMMAND)) {
gholden3 5:28e4c7315a20 164 return initialise_card_v1();
gholden3 5:28e4c7315a20 165 } else {
gholden3 5:28e4c7315a20 166 debug("Not in idle state after sending CMD8 (not an SD card?)\n");
gholden3 5:28e4c7315a20 167 return SDCARD_FAIL;
gholden3 5:28e4c7315a20 168 }
gholden3 5:28e4c7315a20 169 }
gholden3 5:28e4c7315a20 170
gholden3 5:28e4c7315a20 171 int SDFileSystem::initialise_card_v1() {
gholden3 5:28e4c7315a20 172 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
gholden3 5:28e4c7315a20 173 _cmd(55, 0);
gholden3 5:28e4c7315a20 174 if (_cmd(41, 0) == 0) {
gholden3 5:28e4c7315a20 175 cdv = 512;
gholden3 5:28e4c7315a20 176 debug_if(SD_DBG, "\n\rInit: SEDCARD_V1\n\r");
gholden3 5:28e4c7315a20 177 return SDCARD_V1;
gholden3 5:28e4c7315a20 178 }
gholden3 5:28e4c7315a20 179 }
gholden3 5:28e4c7315a20 180
gholden3 5:28e4c7315a20 181 debug("Timeout waiting for v1.x card\n");
gholden3 5:28e4c7315a20 182 return SDCARD_FAIL;
gholden3 5:28e4c7315a20 183 }
gholden3 5:28e4c7315a20 184
gholden3 5:28e4c7315a20 185 int SDFileSystem::initialise_card_v2() {
gholden3 5:28e4c7315a20 186 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
gholden3 5:28e4c7315a20 187 wait_ms(50);
gholden3 5:28e4c7315a20 188 _cmd58();
gholden3 5:28e4c7315a20 189 _cmd(55, 0);
gholden3 5:28e4c7315a20 190 if (_cmd(41, 0x40000000) == 0) {
gholden3 5:28e4c7315a20 191 _cmd58();
gholden3 5:28e4c7315a20 192 debug_if(SD_DBG, "\n\rInit: SDCARD_V2\n\r");
gholden3 5:28e4c7315a20 193 cdv = 1;
gholden3 5:28e4c7315a20 194 return SDCARD_V2;
gholden3 5:28e4c7315a20 195 }
gholden3 5:28e4c7315a20 196 }
gholden3 5:28e4c7315a20 197
gholden3 5:28e4c7315a20 198 debug("Timeout waiting for v2.x card\n");
gholden3 5:28e4c7315a20 199 return SDCARD_FAIL;
gholden3 5:28e4c7315a20 200 }
gholden3 5:28e4c7315a20 201
gholden3 5:28e4c7315a20 202 int SDFileSystem::disk_initialize() {
gholden3 5:28e4c7315a20 203 int i = initialise_card();
gholden3 5:28e4c7315a20 204 debug_if(SD_DBG, "init card = %d\n", i);
gholden3 5:28e4c7315a20 205 _sectors = _sd_sectors();
gholden3 5:28e4c7315a20 206
gholden3 5:28e4c7315a20 207 // Set block length to 512 (CMD16)
gholden3 5:28e4c7315a20 208 if (_cmd(16, 512) != 0) {
gholden3 5:28e4c7315a20 209 debug("Set 512-byte block timed out\n");
gholden3 5:28e4c7315a20 210 return 1;
gholden3 5:28e4c7315a20 211 }
gholden3 5:28e4c7315a20 212
gholden3 5:28e4c7315a20 213 _spi.frequency(1000000); // Set to 1MHz for data transfer
gholden3 5:28e4c7315a20 214 return 0;
gholden3 5:28e4c7315a20 215 }
gholden3 5:28e4c7315a20 216
gholden3 5:28e4c7315a20 217 int SDFileSystem::disk_write(const uint8_t *buffer, uint64_t block_number) {
gholden3 5:28e4c7315a20 218 // set write address for single block (CMD24)
gholden3 5:28e4c7315a20 219 if (_cmd(24, block_number * cdv) != 0) {
gholden3 5:28e4c7315a20 220 return 1;
gholden3 5:28e4c7315a20 221 }
gholden3 5:28e4c7315a20 222
gholden3 5:28e4c7315a20 223 // send the data block
gholden3 5:28e4c7315a20 224 _write(buffer, 512);
gholden3 5:28e4c7315a20 225 return 0;
gholden3 5:28e4c7315a20 226 }
gholden3 5:28e4c7315a20 227
gholden3 5:28e4c7315a20 228 int SDFileSystem::disk_read(uint8_t *buffer, uint64_t block_number) {
gholden3 5:28e4c7315a20 229 // set read address for single block (CMD17)
gholden3 5:28e4c7315a20 230 if (_cmd(17, block_number * cdv) != 0) {
gholden3 5:28e4c7315a20 231 return 1;
gholden3 5:28e4c7315a20 232 }
gholden3 5:28e4c7315a20 233
gholden3 5:28e4c7315a20 234 // receive the data
gholden3 5:28e4c7315a20 235 _read(buffer, 512);
gholden3 5:28e4c7315a20 236 return 0;
gholden3 5:28e4c7315a20 237 }
gholden3 5:28e4c7315a20 238
gholden3 5:28e4c7315a20 239 int SDFileSystem::disk_status() { return 0; }
gholden3 5:28e4c7315a20 240 int SDFileSystem::disk_sync() { return 0; }
gholden3 5:28e4c7315a20 241 uint64_t SDFileSystem::disk_sectors() { return _sectors; }
gholden3 5:28e4c7315a20 242
gholden3 5:28e4c7315a20 243
gholden3 5:28e4c7315a20 244 // PRIVATE FUNCTIONS
gholden3 5:28e4c7315a20 245 int SDFileSystem::_cmd(int cmd, int arg) {
gholden3 5:28e4c7315a20 246 _cs = 0;
gholden3 5:28e4c7315a20 247
gholden3 5:28e4c7315a20 248 // send a command
gholden3 5:28e4c7315a20 249 _spi.write(0x40 | cmd);
gholden3 5:28e4c7315a20 250 _spi.write(arg >> 24);
gholden3 5:28e4c7315a20 251 _spi.write(arg >> 16);
gholden3 5:28e4c7315a20 252 _spi.write(arg >> 8);
gholden3 5:28e4c7315a20 253 _spi.write(arg >> 0);
gholden3 5:28e4c7315a20 254 _spi.write(0x95);
gholden3 5:28e4c7315a20 255
gholden3 5:28e4c7315a20 256 // wait for the repsonse (response[7] == 0)
gholden3 5:28e4c7315a20 257 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
gholden3 5:28e4c7315a20 258 int response = _spi.write(0xFF);
gholden3 5:28e4c7315a20 259 if (!(response & 0x80)) {
gholden3 5:28e4c7315a20 260 _cs = 1;
gholden3 5:28e4c7315a20 261 _spi.write(0xFF);
gholden3 5:28e4c7315a20 262 return response;
gholden3 5:28e4c7315a20 263 }
gholden3 5:28e4c7315a20 264 }
gholden3 5:28e4c7315a20 265 _cs = 1;
gholden3 5:28e4c7315a20 266 _spi.write(0xFF);
gholden3 5:28e4c7315a20 267 return -1; // timeout
gholden3 5:28e4c7315a20 268 }
gholden3 5:28e4c7315a20 269 int SDFileSystem::_cmdx(int cmd, int arg) {
gholden3 5:28e4c7315a20 270 _cs = 0;
gholden3 5:28e4c7315a20 271
gholden3 5:28e4c7315a20 272 // send a command
gholden3 5:28e4c7315a20 273 _spi.write(0x40 | cmd);
gholden3 5:28e4c7315a20 274 _spi.write(arg >> 24);
gholden3 5:28e4c7315a20 275 _spi.write(arg >> 16);
gholden3 5:28e4c7315a20 276 _spi.write(arg >> 8);
gholden3 5:28e4c7315a20 277 _spi.write(arg >> 0);
gholden3 5:28e4c7315a20 278 _spi.write(0x95);
gholden3 5:28e4c7315a20 279
gholden3 5:28e4c7315a20 280 // wait for the repsonse (response[7] == 0)
gholden3 5:28e4c7315a20 281 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
gholden3 5:28e4c7315a20 282 int response = _spi.write(0xFF);
gholden3 5:28e4c7315a20 283 if (!(response & 0x80)) {
gholden3 5:28e4c7315a20 284 return response;
gholden3 5:28e4c7315a20 285 }
gholden3 5:28e4c7315a20 286 }
gholden3 5:28e4c7315a20 287 _cs = 1;
gholden3 5:28e4c7315a20 288 _spi.write(0xFF);
gholden3 5:28e4c7315a20 289 return -1; // timeout
gholden3 5:28e4c7315a20 290 }
gholden3 5:28e4c7315a20 291
gholden3 5:28e4c7315a20 292
gholden3 5:28e4c7315a20 293 int SDFileSystem::_cmd58() {
gholden3 5:28e4c7315a20 294 _cs = 0;
gholden3 5:28e4c7315a20 295 int arg = 0;
gholden3 5:28e4c7315a20 296
gholden3 5:28e4c7315a20 297 // send a command
gholden3 5:28e4c7315a20 298 _spi.write(0x40 | 58);
gholden3 5:28e4c7315a20 299 _spi.write(arg >> 24);
gholden3 5:28e4c7315a20 300 _spi.write(arg >> 16);
gholden3 5:28e4c7315a20 301 _spi.write(arg >> 8);
gholden3 5:28e4c7315a20 302 _spi.write(arg >> 0);
gholden3 5:28e4c7315a20 303 _spi.write(0x95);
gholden3 5:28e4c7315a20 304
gholden3 5:28e4c7315a20 305 // wait for the repsonse (response[7] == 0)
gholden3 5:28e4c7315a20 306 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
gholden3 5:28e4c7315a20 307 int response = _spi.write(0xFF);
gholden3 5:28e4c7315a20 308 if (!(response & 0x80)) {
gholden3 5:28e4c7315a20 309 int ocr = _spi.write(0xFF) << 24;
gholden3 5:28e4c7315a20 310 ocr |= _spi.write(0xFF) << 16;
gholden3 5:28e4c7315a20 311 ocr |= _spi.write(0xFF) << 8;
gholden3 5:28e4c7315a20 312 ocr |= _spi.write(0xFF) << 0;
gholden3 5:28e4c7315a20 313 _cs = 1;
gholden3 5:28e4c7315a20 314 _spi.write(0xFF);
gholden3 5:28e4c7315a20 315 return response;
gholden3 5:28e4c7315a20 316 }
gholden3 5:28e4c7315a20 317 }
gholden3 5:28e4c7315a20 318 _cs = 1;
gholden3 5:28e4c7315a20 319 _spi.write(0xFF);
gholden3 5:28e4c7315a20 320 return -1; // timeout
gholden3 5:28e4c7315a20 321 }
gholden3 5:28e4c7315a20 322
gholden3 5:28e4c7315a20 323 int SDFileSystem::_cmd8() {
gholden3 5:28e4c7315a20 324 _cs = 0;
gholden3 5:28e4c7315a20 325
gholden3 5:28e4c7315a20 326 // send a command
gholden3 5:28e4c7315a20 327 _spi.write(0x40 | 8); // CMD8
gholden3 5:28e4c7315a20 328 _spi.write(0x00); // reserved
gholden3 5:28e4c7315a20 329 _spi.write(0x00); // reserved
gholden3 5:28e4c7315a20 330 _spi.write(0x01); // 3.3v
gholden3 5:28e4c7315a20 331 _spi.write(0xAA); // check pattern
gholden3 5:28e4c7315a20 332 _spi.write(0x87); // crc
gholden3 5:28e4c7315a20 333
gholden3 5:28e4c7315a20 334 // wait for the repsonse (response[7] == 0)
gholden3 5:28e4c7315a20 335 for (int i = 0; i < SD_COMMAND_TIMEOUT * 1000; i++) {
gholden3 5:28e4c7315a20 336 char response[5];
gholden3 5:28e4c7315a20 337 response[0] = _spi.write(0xFF);
gholden3 5:28e4c7315a20 338 if (!(response[0] & 0x80)) {
gholden3 5:28e4c7315a20 339 for (int j = 1; j < 5; j++) {
gholden3 5:28e4c7315a20 340 response[i] = _spi.write(0xFF);
gholden3 5:28e4c7315a20 341 }
gholden3 5:28e4c7315a20 342 _cs = 1;
gholden3 5:28e4c7315a20 343 _spi.write(0xFF);
gholden3 5:28e4c7315a20 344 return response[0];
gholden3 5:28e4c7315a20 345 }
gholden3 5:28e4c7315a20 346 }
gholden3 5:28e4c7315a20 347 _cs = 1;
gholden3 5:28e4c7315a20 348 _spi.write(0xFF);
gholden3 5:28e4c7315a20 349 return -1; // timeout
gholden3 5:28e4c7315a20 350 }
gholden3 5:28e4c7315a20 351
gholden3 5:28e4c7315a20 352 int SDFileSystem::_read(uint8_t *buffer, uint32_t length) {
gholden3 5:28e4c7315a20 353 _cs = 0;
gholden3 5:28e4c7315a20 354
gholden3 5:28e4c7315a20 355 // read until start byte (0xFF)
gholden3 5:28e4c7315a20 356 while (_spi.write(0xFF) != 0xFE);
gholden3 5:28e4c7315a20 357
gholden3 5:28e4c7315a20 358 // read data
gholden3 5:28e4c7315a20 359 for (int i = 0; i < length; i++) {
gholden3 5:28e4c7315a20 360 buffer[i] = _spi.write(0xFF);
gholden3 5:28e4c7315a20 361 }
gholden3 5:28e4c7315a20 362 _spi.write(0xFF); // checksum
gholden3 5:28e4c7315a20 363 _spi.write(0xFF);
gholden3 5:28e4c7315a20 364
gholden3 5:28e4c7315a20 365 _cs = 1;
gholden3 5:28e4c7315a20 366 _spi.write(0xFF);
gholden3 5:28e4c7315a20 367 return 0;
gholden3 5:28e4c7315a20 368 }
gholden3 5:28e4c7315a20 369
gholden3 5:28e4c7315a20 370 int SDFileSystem::_write(const uint8_t*buffer, uint32_t length) {
gholden3 5:28e4c7315a20 371 _cs = 0;
gholden3 5:28e4c7315a20 372
gholden3 5:28e4c7315a20 373 // indicate start of block
gholden3 5:28e4c7315a20 374 _spi.write(0xFE);
gholden3 5:28e4c7315a20 375
gholden3 5:28e4c7315a20 376 // write the data
gholden3 5:28e4c7315a20 377 for (int i = 0; i < length; i++) {
gholden3 5:28e4c7315a20 378 _spi.write(buffer[i]);
gholden3 5:28e4c7315a20 379 }
gholden3 5:28e4c7315a20 380
gholden3 5:28e4c7315a20 381 // write the checksum
gholden3 5:28e4c7315a20 382 _spi.write(0xFF);
gholden3 5:28e4c7315a20 383 _spi.write(0xFF);
gholden3 5:28e4c7315a20 384
gholden3 5:28e4c7315a20 385 // check the response token
gholden3 5:28e4c7315a20 386 if ((_spi.write(0xFF) & 0x1F) != 0x05) {
gholden3 5:28e4c7315a20 387 _cs = 1;
gholden3 5:28e4c7315a20 388 _spi.write(0xFF);
gholden3 5:28e4c7315a20 389 return 1;
gholden3 5:28e4c7315a20 390 }
gholden3 5:28e4c7315a20 391
gholden3 5:28e4c7315a20 392 // wait for write to finish
gholden3 5:28e4c7315a20 393 while (_spi.write(0xFF) == 0);
gholden3 5:28e4c7315a20 394
gholden3 5:28e4c7315a20 395 _cs = 1;
gholden3 5:28e4c7315a20 396 _spi.write(0xFF);
gholden3 5:28e4c7315a20 397 return 0;
gholden3 5:28e4c7315a20 398 }
gholden3 5:28e4c7315a20 399
gholden3 5:28e4c7315a20 400 static uint32_t ext_bits(unsigned char *data, int msb, int lsb) {
gholden3 5:28e4c7315a20 401 uint32_t bits = 0;
gholden3 5:28e4c7315a20 402 uint32_t size = 1 + msb - lsb;
gholden3 5:28e4c7315a20 403 for (int i = 0; i < size; i++) {
gholden3 5:28e4c7315a20 404 uint32_t position = lsb + i;
gholden3 5:28e4c7315a20 405 uint32_t byte = 15 - (position >> 3);
gholden3 5:28e4c7315a20 406 uint32_t bit = position & 0x7;
gholden3 5:28e4c7315a20 407 uint32_t value = (data[byte] >> bit) & 1;
gholden3 5:28e4c7315a20 408 bits |= value << i;
gholden3 5:28e4c7315a20 409 }
gholden3 5:28e4c7315a20 410 return bits;
gholden3 5:28e4c7315a20 411 }
gholden3 5:28e4c7315a20 412
gholden3 5:28e4c7315a20 413 uint64_t SDFileSystem::_sd_sectors() {
gholden3 5:28e4c7315a20 414 uint32_t c_size, c_size_mult, read_bl_len;
gholden3 5:28e4c7315a20 415 uint32_t block_len, mult, blocknr, capacity;
gholden3 5:28e4c7315a20 416 uint32_t hc_c_size;
gholden3 5:28e4c7315a20 417 uint64_t blocks;
gholden3 5:28e4c7315a20 418
gholden3 5:28e4c7315a20 419 // CMD9, Response R2 (R1 byte + 16-byte block read)
gholden3 5:28e4c7315a20 420 if (_cmdx(9, 0) != 0) {
gholden3 5:28e4c7315a20 421 debug("Didn't get a response from the disk\n");
gholden3 5:28e4c7315a20 422 return 0;
gholden3 5:28e4c7315a20 423 }
gholden3 5:28e4c7315a20 424
gholden3 5:28e4c7315a20 425 uint8_t csd[16];
gholden3 5:28e4c7315a20 426 if (_read(csd, 16) != 0) {
gholden3 5:28e4c7315a20 427 debug("Couldn't read csd response from disk\n");
gholden3 5:28e4c7315a20 428 return 0;
gholden3 5:28e4c7315a20 429 }
gholden3 5:28e4c7315a20 430
gholden3 5:28e4c7315a20 431 // csd_structure : csd[127:126]
gholden3 5:28e4c7315a20 432 // c_size : csd[73:62]
gholden3 5:28e4c7315a20 433 // c_size_mult : csd[49:47]
gholden3 5:28e4c7315a20 434 // read_bl_len : csd[83:80] - the *maximum* read block length
gholden3 5:28e4c7315a20 435
gholden3 5:28e4c7315a20 436 int csd_structure = ext_bits(csd, 127, 126);
gholden3 5:28e4c7315a20 437
gholden3 5:28e4c7315a20 438 switch (csd_structure) {
gholden3 5:28e4c7315a20 439 case 0:
gholden3 5:28e4c7315a20 440 cdv = 512;
gholden3 5:28e4c7315a20 441 c_size = ext_bits(csd, 73, 62);
gholden3 5:28e4c7315a20 442 c_size_mult = ext_bits(csd, 49, 47);
gholden3 5:28e4c7315a20 443 read_bl_len = ext_bits(csd, 83, 80);
gholden3 5:28e4c7315a20 444
gholden3 5:28e4c7315a20 445 block_len = 1 << read_bl_len;
gholden3 5:28e4c7315a20 446 mult = 1 << (c_size_mult + 2);
gholden3 5:28e4c7315a20 447 blocknr = (c_size + 1) * mult;
gholden3 5:28e4c7315a20 448 capacity = blocknr * block_len;
gholden3 5:28e4c7315a20 449 blocks = capacity / 512;
gholden3 5:28e4c7315a20 450 debug_if(SD_DBG, "\n\rSDCard\n\rc_size: %d \n\rcapacity: %ld \n\rsectors: %lld\n\r", c_size, capacity, blocks);
gholden3 5:28e4c7315a20 451 break;
gholden3 5:28e4c7315a20 452
gholden3 5:28e4c7315a20 453 case 1:
gholden3 5:28e4c7315a20 454 cdv = 1;
gholden3 5:28e4c7315a20 455 hc_c_size = ext_bits(csd, 63, 48);
gholden3 5:28e4c7315a20 456 blocks = (hc_c_size+1)*1024;
gholden3 5:28e4c7315a20 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);
gholden3 5:28e4c7315a20 458 break;
gholden3 5:28e4c7315a20 459
gholden3 5:28e4c7315a20 460 default:
gholden3 5:28e4c7315a20 461 debug("CSD struct unsupported\r\n");
gholden3 5:28e4c7315a20 462 return 0;
gholden3 5:28e4c7315a20 463 };
gholden3 5:28e4c7315a20 464 return blocks;
gholden3 5:28e4c7315a20 465 }