Paul Seeber / SDFileSystem

Paul's baseline branch

Dependents:   Multi-FileSystem

Fork of SDFileSystem by David Smart

SDFileSystem.cpp@6:55a26a56046a, 2014-08-01 (annotated)

Committer:
neilt6
Date:
Fri Aug 01 14:45:21 2014 +0000
Revision:
6:55a26a56046a
Parent:
5:6befff2300d0
Child:
7:61db99e52c0d
Added the option to disable CRC, and enable 16-bit frames for data read/write operations

Who changed what in which revision?

UserRevisionLine numberNew contents of line
neilt6 0:2a6d8a096edc 1 /* SD/MMC File System Library
neilt6 0:2a6d8a096edc 2 * Copyright (c) 2014 Neil Thiessen
neilt6 0:2a6d8a096edc 3 *
neilt6 0:2a6d8a096edc 4 * Licensed under the Apache License, Version 2.0 (the "License");
neilt6 0:2a6d8a096edc 5 * you may not use this file except in compliance with the License.
neilt6 0:2a6d8a096edc 6 * You may obtain a copy of the License at
neilt6 0:2a6d8a096edc 7 *
neilt6 0:2a6d8a096edc 8 * http://www.apache.org/licenses/LICENSE-2.0
neilt6 0:2a6d8a096edc 9 *
neilt6 0:2a6d8a096edc 10 * Unless required by applicable law or agreed to in writing, software
neilt6 0:2a6d8a096edc 11 * distributed under the License is distributed on an "AS IS" BASIS,
neilt6 0:2a6d8a096edc 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
neilt6 0:2a6d8a096edc 13 * See the License for the specific language governing permissions and
neilt6 0:2a6d8a096edc 14 * limitations under the License.
neilt6 0:2a6d8a096edc 15 */
neilt6 0:2a6d8a096edc 16
neilt6 0:2a6d8a096edc 17 #include "SDFileSystem.h"
neilt6 0:2a6d8a096edc 18 #include "diskio.h"
neilt6 0:2a6d8a096edc 19 #include "CRC7.h"
neilt6 0:2a6d8a096edc 20 #include "CRC16.h"
neilt6 0:2a6d8a096edc 21
neilt6 6:55a26a56046a 22 SDFileSystem::SDFileSystem(PinName mosi, PinName miso, PinName sclk, PinName cs, const char* name, PinName cd, SwitchType cdtype, int hz) : FATFileSystem(name), m_SPI(mosi, miso, sclk), m_CS(cs, 1), m_CD(cd), m_CD_ASSERT((int)cdtype), m_FREQ(hz)
neilt6 0:2a6d8a096edc 23 {
neilt6 0:2a6d8a096edc 24 //Initialize the member variables
neilt6 6:55a26a56046a 25 m_CardType = CARD_NONE;
neilt6 6:55a26a56046a 26 m_CrcEnabled = true;
neilt6 6:55a26a56046a 27 m_LargeFrames = false;
neilt6 0:2a6d8a096edc 28 m_Status = STA_NOINIT;
neilt6 0:2a6d8a096edc 29
neilt6 0:2a6d8a096edc 30 //Configure the SPI bus
neilt6 0:2a6d8a096edc 31 m_SPI.format(8, 0);
neilt6 0:2a6d8a096edc 32
neilt6 0:2a6d8a096edc 33 //Configure the card detect pin
neilt6 0:2a6d8a096edc 34 m_CD.mode(PullUp);
neilt6 1:25f4ba436b81 35 if (cdtype == SWITCH_NO)
neilt6 1:25f4ba436b81 36 m_CD.rise(this, &SDFileSystem::checkSocket);
neilt6 1:25f4ba436b81 37 else
neilt6 1:25f4ba436b81 38 m_CD.fall(this, &SDFileSystem::checkSocket);
neilt6 0:2a6d8a096edc 39 }
neilt6 0:2a6d8a096edc 40
neilt6 0:2a6d8a096edc 41 SDFileSystem::CardType SDFileSystem::card_type()
neilt6 0:2a6d8a096edc 42 {
neilt6 0:2a6d8a096edc 43 //Check the card socket
neilt6 0:2a6d8a096edc 44 checkSocket();
neilt6 0:2a6d8a096edc 45
neilt6 0:2a6d8a096edc 46 //If a card is present but not initialized, initialize it
neilt6 0:2a6d8a096edc 47 if (!(m_Status & STA_NODISK) && (m_Status & STA_NOINIT))
neilt6 0:2a6d8a096edc 48 disk_initialize();
neilt6 0:2a6d8a096edc 49
neilt6 0:2a6d8a096edc 50 //Return the card type
neilt6 0:2a6d8a096edc 51 return m_CardType;
neilt6 0:2a6d8a096edc 52 }
neilt6 0:2a6d8a096edc 53
neilt6 6:55a26a56046a 54 bool SDFileSystem::crc_enabled()
neilt6 6:55a26a56046a 55 {
neilt6 6:55a26a56046a 56 //Return whether or not CRC is enabled
neilt6 6:55a26a56046a 57 return m_CrcEnabled;
neilt6 6:55a26a56046a 58 }
neilt6 6:55a26a56046a 59
neilt6 6:55a26a56046a 60 void SDFileSystem::crc_enabled(bool enabled)
neilt6 6:55a26a56046a 61 {
neilt6 6:55a26a56046a 62 //Check the card socket
neilt6 6:55a26a56046a 63 checkSocket();
neilt6 6:55a26a56046a 64
neilt6 6:55a26a56046a 65 //Just update the member variable if the card isn't initialized
neilt6 6:55a26a56046a 66 if (m_Status & STA_NOINIT) {
neilt6 6:55a26a56046a 67 m_CrcEnabled = enabled;
neilt6 6:55a26a56046a 68 return;
neilt6 6:55a26a56046a 69 }
neilt6 6:55a26a56046a 70
neilt6 6:55a26a56046a 71 //Enable or disable CRC
neilt6 6:55a26a56046a 72 if (!m_CrcEnabled && enabled) {
neilt6 6:55a26a56046a 73 //Send CMD59(0x00000001) to enable CRC
neilt6 6:55a26a56046a 74 writeCommand(CMD59, 0x00000001);
neilt6 6:55a26a56046a 75 m_CrcEnabled = true;
neilt6 6:55a26a56046a 76 } else if (m_CrcEnabled && !enabled) {
neilt6 6:55a26a56046a 77 //Send CMD59(0x00000000) to disable CRC
neilt6 6:55a26a56046a 78 writeCommand(CMD59, 0x00000000);
neilt6 6:55a26a56046a 79 m_CrcEnabled = false;
neilt6 6:55a26a56046a 80 }
neilt6 6:55a26a56046a 81 }
neilt6 6:55a26a56046a 82
neilt6 6:55a26a56046a 83 bool SDFileSystem::large_frames()
neilt6 6:55a26a56046a 84 {
neilt6 6:55a26a56046a 85 //Return whether or not 16-bit frames are enabled
neilt6 6:55a26a56046a 86 return m_LargeFrames;
neilt6 6:55a26a56046a 87 }
neilt6 6:55a26a56046a 88
neilt6 6:55a26a56046a 89 void SDFileSystem::large_frames(bool enabled)
neilt6 6:55a26a56046a 90 {
neilt6 6:55a26a56046a 91 //Set whether or not 16-bit frames are enabled
neilt6 6:55a26a56046a 92 m_LargeFrames = enabled;
neilt6 6:55a26a56046a 93 }
neilt6 6:55a26a56046a 94
neilt6 0:2a6d8a096edc 95 int SDFileSystem::disk_initialize()
neilt6 0:2a6d8a096edc 96 {
neilt6 0:2a6d8a096edc 97 char resp;
neilt6 0:2a6d8a096edc 98
neilt6 0:2a6d8a096edc 99 //Make sure there's a card in the socket before proceeding
neilt6 0:2a6d8a096edc 100 checkSocket();
neilt6 0:2a6d8a096edc 101 if (m_Status & STA_NODISK)
neilt6 0:2a6d8a096edc 102 return m_Status;
neilt6 0:2a6d8a096edc 103
neilt6 0:2a6d8a096edc 104 //Make sure we're not already initialized before proceeding
neilt6 0:2a6d8a096edc 105 if (!(m_Status & STA_NOINIT))
neilt6 0:2a6d8a096edc 106 return m_Status;
neilt6 0:2a6d8a096edc 107
neilt6 0:2a6d8a096edc 108 //Set the SPI frequency to 100kHz for initialization
neilt6 0:2a6d8a096edc 109 m_SPI.frequency(100000);
neilt6 0:2a6d8a096edc 110
neilt6 0:2a6d8a096edc 111 //Send 80 dummy clocks with /CS and DI held high
neilt6 0:2a6d8a096edc 112 m_CS = 1;
neilt6 0:2a6d8a096edc 113 for (int i = 0; i < 10; i++)
neilt6 0:2a6d8a096edc 114 m_SPI.write(0xFF);
neilt6 0:2a6d8a096edc 115
neilt6 5:6befff2300d0 116 //Write CMD0(0x00000000) to reset the card
neilt6 5:6befff2300d0 117 resp = writeCommand(CMD0, 0x00000000);
neilt6 0:2a6d8a096edc 118 if (resp != 0x01) {
neilt6 0:2a6d8a096edc 119 //Initialization failed
neilt6 0:2a6d8a096edc 120 m_CardType = CARD_UNKNOWN;
neilt6 0:2a6d8a096edc 121 return m_Status;
neilt6 0:2a6d8a096edc 122 }
neilt6 0:2a6d8a096edc 123
neilt6 0:2a6d8a096edc 124 //Write CMD8(0x000001AA) to see if this is an SDCv2 card
neilt6 0:2a6d8a096edc 125 resp = writeCommand(CMD8, 0x000001AA);
neilt6 0:2a6d8a096edc 126 if (resp == 0x01) {
neilt6 0:2a6d8a096edc 127 //This is an SDCv2 card, get the 32-bit return value and verify the voltage range/check pattern
neilt6 0:2a6d8a096edc 128 if ((readReturn() & 0xFFF) != 0x1AA) {
neilt6 0:2a6d8a096edc 129 //Initialization failed
neilt6 0:2a6d8a096edc 130 m_CardType = CARD_UNKNOWN;
neilt6 0:2a6d8a096edc 131 return m_Status;
neilt6 0:2a6d8a096edc 132 }
neilt6 0:2a6d8a096edc 133
neilt6 5:6befff2300d0 134 //Send CMD58(0x00000000) to read the OCR, and verify that the card supports 3.2-3.3V
neilt6 5:6befff2300d0 135 resp = writeCommand(CMD58, 0x00000000);
neilt6 0:2a6d8a096edc 136 if (resp != 0x01 || !(readReturn() & (1 << 20))) {
neilt6 0:2a6d8a096edc 137 //Initialization failed
neilt6 0:2a6d8a096edc 138 m_CardType = CARD_UNKNOWN;
neilt6 0:2a6d8a096edc 139 return m_Status;
neilt6 0:2a6d8a096edc 140 }
neilt6 0:2a6d8a096edc 141
neilt6 0:2a6d8a096edc 142 //Send ACMD41(0x40100000) repeatedly for up to 1 second to initialize the card
neilt6 0:2a6d8a096edc 143 for (int i = 0; i < 1000; i++) {
neilt6 0:2a6d8a096edc 144 resp = writeCommand(ACMD41, 0x40100000);
neilt6 0:2a6d8a096edc 145 if (resp != 0x01)
neilt6 0:2a6d8a096edc 146 break;
neilt6 0:2a6d8a096edc 147 wait_ms(1);
neilt6 0:2a6d8a096edc 148 }
neilt6 0:2a6d8a096edc 149
neilt6 0:2a6d8a096edc 150 //Check if the card initialized
neilt6 0:2a6d8a096edc 151 if (resp != 0x00) {
neilt6 0:2a6d8a096edc 152 //Initialization failed
neilt6 0:2a6d8a096edc 153 m_CardType = CARD_UNKNOWN;
neilt6 0:2a6d8a096edc 154 return m_Status;
neilt6 0:2a6d8a096edc 155 }
neilt6 0:2a6d8a096edc 156
neilt6 5:6befff2300d0 157 //Send CMD58(0x00000000) to read the OCR
neilt6 5:6befff2300d0 158 resp = writeCommand(CMD58, 0x00000000);
neilt6 0:2a6d8a096edc 159 if (resp == 0x00) {
neilt6 0:2a6d8a096edc 160 //Check the CCS bit to determine if this is a high capacity card
neilt6 5:6befff2300d0 161 if (readReturn() & (1 << 30))
neilt6 0:2a6d8a096edc 162 m_CardType = CARD_SDHC;
neilt6 0:2a6d8a096edc 163 else
neilt6 0:2a6d8a096edc 164 m_CardType = CARD_SD;
neilt6 0:2a6d8a096edc 165 } else {
neilt6 0:2a6d8a096edc 166 //Initialization failed
neilt6 0:2a6d8a096edc 167 m_CardType = CARD_UNKNOWN;
neilt6 0:2a6d8a096edc 168 return m_Status;
neilt6 0:2a6d8a096edc 169 }
neilt6 0:2a6d8a096edc 170 } else {
neilt6 0:2a6d8a096edc 171 //Didn't respond or illegal command, this is either an SDCv1 or MMC card
neilt6 5:6befff2300d0 172 //Send CMD58(0x00000000) to read the OCR, and verify that the card supports 3.2-3.3V
neilt6 5:6befff2300d0 173 resp = writeCommand(CMD58, 0x00000000);
neilt6 0:2a6d8a096edc 174 if (resp != 0x01 || !(readReturn() & (1 << 20))) {
neilt6 0:2a6d8a096edc 175 //Initialization failed
neilt6 0:2a6d8a096edc 176 m_CardType = CARD_UNKNOWN;
neilt6 0:2a6d8a096edc 177 return m_Status;
neilt6 0:2a6d8a096edc 178 }
neilt6 0:2a6d8a096edc 179
neilt6 0:2a6d8a096edc 180 //Try to initialize the card using ACMD41(0x00100000) for 1 second
neilt6 0:2a6d8a096edc 181 for (int i = 0; i < 1000; i++) {
neilt6 0:2a6d8a096edc 182 resp = writeCommand(ACMD41, 0x00100000);
neilt6 0:2a6d8a096edc 183 if (resp != 0x01)
neilt6 0:2a6d8a096edc 184 break;
neilt6 0:2a6d8a096edc 185 wait_ms(1);
neilt6 0:2a6d8a096edc 186 }
neilt6 0:2a6d8a096edc 187
neilt6 0:2a6d8a096edc 188 //Check if the card initialized
neilt6 0:2a6d8a096edc 189 if (resp == 0x00) {
neilt6 0:2a6d8a096edc 190 //This is an SDCv1 standard capacity card
neilt6 0:2a6d8a096edc 191 m_CardType = CARD_SD;
neilt6 0:2a6d8a096edc 192 } else {
neilt6 0:2a6d8a096edc 193 //Try to initialize the card using CMD1(0x00100000) for 1 second
neilt6 0:2a6d8a096edc 194 for (int i = 0; i < 1000; i++) {
neilt6 0:2a6d8a096edc 195 resp = writeCommand(CMD1, 0x00100000);
neilt6 0:2a6d8a096edc 196 if (resp != 0x01)
neilt6 0:2a6d8a096edc 197 break;
neilt6 0:2a6d8a096edc 198 wait_ms(1);
neilt6 0:2a6d8a096edc 199 }
neilt6 0:2a6d8a096edc 200
neilt6 0:2a6d8a096edc 201 //Check if the card initialized
neilt6 0:2a6d8a096edc 202 if (resp == 0x00) {
neilt6 0:2a6d8a096edc 203 //This is an MMCv3 card
neilt6 0:2a6d8a096edc 204 m_CardType = CARD_MMC;
neilt6 0:2a6d8a096edc 205 } else {
neilt6 0:2a6d8a096edc 206 //Initialization failed
neilt6 0:2a6d8a096edc 207 m_CardType = CARD_UNKNOWN;
neilt6 0:2a6d8a096edc 208 return m_Status;
neilt6 0:2a6d8a096edc 209 }
neilt6 0:2a6d8a096edc 210 }
neilt6 0:2a6d8a096edc 211 }
neilt6 0:2a6d8a096edc 212
neilt6 6:55a26a56046a 213 //Send CMD59(0x00000001) to enable CRC if necessary
neilt6 6:55a26a56046a 214 if (m_CrcEnabled) {
neilt6 6:55a26a56046a 215 resp = writeCommand(CMD59, 0x00000001);
neilt6 6:55a26a56046a 216 if (resp != 0x00) {
neilt6 6:55a26a56046a 217 //Initialization failed
neilt6 6:55a26a56046a 218 m_CardType = CARD_UNKNOWN;
neilt6 6:55a26a56046a 219 return m_Status;
neilt6 6:55a26a56046a 220 }
neilt6 0:2a6d8a096edc 221 }
neilt6 0:2a6d8a096edc 222
neilt6 0:2a6d8a096edc 223 //Send CMD16(0x00000200) to force the block size to 512B if necessary
neilt6 0:2a6d8a096edc 224 if (m_CardType != CARD_SDHC) {
neilt6 0:2a6d8a096edc 225 resp = writeCommand(CMD16, 0x00000200);
neilt6 0:2a6d8a096edc 226 if (resp != 0x00) {
neilt6 0:2a6d8a096edc 227 //Initialization failed
neilt6 0:2a6d8a096edc 228 m_CardType = CARD_UNKNOWN;
neilt6 0:2a6d8a096edc 229 return m_Status;
neilt6 0:2a6d8a096edc 230 }
neilt6 0:2a6d8a096edc 231 }
neilt6 0:2a6d8a096edc 232
neilt6 5:6befff2300d0 233 //Send ACMD42(0x00000000) to disconnect the internal pull-up resistor on /CS if necessary
neilt6 5:6befff2300d0 234 if (m_CardType != CARD_MMC) {
neilt6 5:6befff2300d0 235 resp = writeCommand(ACMD42, 0x00000000);
neilt6 5:6befff2300d0 236 if (resp != 0x00) {
neilt6 5:6befff2300d0 237 //Initialization failed
neilt6 5:6befff2300d0 238 m_CardType = CARD_UNKNOWN;
neilt6 5:6befff2300d0 239 return m_Status;
neilt6 5:6befff2300d0 240 }
neilt6 5:6befff2300d0 241 }
neilt6 5:6befff2300d0 242
neilt6 0:2a6d8a096edc 243 //The card is now initialized
neilt6 0:2a6d8a096edc 244 m_Status &= ~STA_NOINIT;
neilt6 0:2a6d8a096edc 245
neilt6 0:2a6d8a096edc 246 //Increase the SPI frequency to full speed (limited to 20MHz for MMC, or 25MHz for SDC)
neilt6 6:55a26a56046a 247 if (m_CardType == CARD_MMC && m_FREQ > 20000000)
neilt6 0:2a6d8a096edc 248 m_SPI.frequency(20000000);
neilt6 6:55a26a56046a 249 else if (m_FREQ > 25000000)
neilt6 0:2a6d8a096edc 250 m_SPI.frequency(25000000);
neilt6 0:2a6d8a096edc 251 else
neilt6 6:55a26a56046a 252 m_SPI.frequency(m_FREQ);
neilt6 0:2a6d8a096edc 253
neilt6 0:2a6d8a096edc 254 //Return the device status
neilt6 0:2a6d8a096edc 255 return m_Status;
neilt6 0:2a6d8a096edc 256 }
neilt6 0:2a6d8a096edc 257
neilt6 0:2a6d8a096edc 258 int SDFileSystem::disk_status()
neilt6 0:2a6d8a096edc 259 {
neilt6 0:2a6d8a096edc 260 //Check if there's a card in the socket
neilt6 0:2a6d8a096edc 261 checkSocket();
neilt6 0:2a6d8a096edc 262
neilt6 0:2a6d8a096edc 263 //Return the device status
neilt6 0:2a6d8a096edc 264 return m_Status;
neilt6 0:2a6d8a096edc 265 }
neilt6 0:2a6d8a096edc 266
neilt6 0:2a6d8a096edc 267 int SDFileSystem::disk_read(uint8_t* buffer, uint64_t sector)
neilt6 0:2a6d8a096edc 268 {
neilt6 0:2a6d8a096edc 269 //Make sure the device is initialized before proceeding
neilt6 0:2a6d8a096edc 270 if (m_Status & STA_NOINIT)
neilt6 0:2a6d8a096edc 271 return RES_NOTRDY;
neilt6 0:2a6d8a096edc 272
neilt6 0:2a6d8a096edc 273 //Convert from LBA to a byte address for standard capacity cards
neilt6 0:2a6d8a096edc 274 if (m_CardType != CARD_SDHC)
neilt6 0:2a6d8a096edc 275 sector *= 512;
neilt6 0:2a6d8a096edc 276
neilt6 0:2a6d8a096edc 277 //Try to read the block up to 3 times
neilt6 0:2a6d8a096edc 278 for (int i = 0; i < 3; i++) {
neilt6 0:2a6d8a096edc 279 //Send CMD17(sector) to read a single block
neilt6 0:2a6d8a096edc 280 char resp = writeCommand(CMD17, sector);
neilt6 0:2a6d8a096edc 281 if (resp == 0x00) {
neilt6 0:2a6d8a096edc 282 //Try to read the sector, and return if successful
neilt6 0:2a6d8a096edc 283 if (readData((char*)buffer, 512))
neilt6 0:2a6d8a096edc 284 return RES_OK;
neilt6 0:2a6d8a096edc 285 } else {
neilt6 0:2a6d8a096edc 286 //The command failed
neilt6 0:2a6d8a096edc 287 return RES_ERROR;
neilt6 0:2a6d8a096edc 288 }
neilt6 0:2a6d8a096edc 289 }
neilt6 0:2a6d8a096edc 290
neilt6 0:2a6d8a096edc 291 //The read operation failed 3 times (CRC most likely)
neilt6 0:2a6d8a096edc 292 return RES_ERROR;
neilt6 0:2a6d8a096edc 293 }
neilt6 0:2a6d8a096edc 294
neilt6 0:2a6d8a096edc 295 int SDFileSystem::disk_write(const uint8_t* buffer, uint64_t sector)
neilt6 0:2a6d8a096edc 296 {
neilt6 0:2a6d8a096edc 297 //Make sure the device is initialized before proceeding
neilt6 0:2a6d8a096edc 298 if (m_Status & STA_NOINIT)
neilt6 0:2a6d8a096edc 299 return RES_NOTRDY;
neilt6 0:2a6d8a096edc 300
neilt6 0:2a6d8a096edc 301 //Make sure the device isn't write protected before proceeding
neilt6 0:2a6d8a096edc 302 if (m_Status & STA_PROTECT)
neilt6 0:2a6d8a096edc 303 return RES_WRPRT;
neilt6 0:2a6d8a096edc 304
neilt6 0:2a6d8a096edc 305 //Convert from LBA to a byte address for older cards
neilt6 0:2a6d8a096edc 306 if (m_CardType != CARD_SDHC)
neilt6 0:2a6d8a096edc 307 sector *= 512;
neilt6 0:2a6d8a096edc 308
neilt6 0:2a6d8a096edc 309 //Try to write the block up to 3 times
neilt6 0:2a6d8a096edc 310 for (int i = 0; i < 3; i++) {
neilt6 0:2a6d8a096edc 311 //Send CMD24(sector) to write a single block
neilt6 0:2a6d8a096edc 312 if (writeCommand(CMD24, sector) == 0x00) {
neilt6 0:2a6d8a096edc 313 //Wait for up to 500ms for the card to become ready
neilt6 0:2a6d8a096edc 314 if (!waitReady(500)) {
neilt6 2:eec1db773e7d 315 //We timed out, deselect and loop again
neilt6 0:2a6d8a096edc 316 deselect();
neilt6 0:2a6d8a096edc 317 continue;
neilt6 0:2a6d8a096edc 318 }
neilt6 0:2a6d8a096edc 319
neilt6 0:2a6d8a096edc 320 //Send the write data token
neilt6 0:2a6d8a096edc 321 m_SPI.write(0xFE);
neilt6 0:2a6d8a096edc 322
neilt6 6:55a26a56046a 323 //Check if large frames are enabled or not
neilt6 6:55a26a56046a 324 if (m_LargeFrames) {
neilt6 6:55a26a56046a 325 //Switch to 16-bit frames for better performance
neilt6 6:55a26a56046a 326 m_SPI.format(16, 0);
neilt6 6:55a26a56046a 327
neilt6 6:55a26a56046a 328 //Write the data block from the buffer
neilt6 6:55a26a56046a 329 for (int b = 0; b < 512; b += 2) {
neilt6 6:55a26a56046a 330 m_SPI.write((buffer[b] << 8) | buffer[b + 1]);
neilt6 6:55a26a56046a 331 }
neilt6 6:55a26a56046a 332
neilt6 6:55a26a56046a 333 //Calculate the CRC16 checksum for the data block and send it (if enabled)
neilt6 6:55a26a56046a 334 m_SPI.write(m_CrcEnabled ? CRC16((char*)buffer, 512) : 0xFFFF);
neilt6 0:2a6d8a096edc 335
neilt6 6:55a26a56046a 336 //Switch back to 8-bit frames
neilt6 6:55a26a56046a 337 m_SPI.format(8, 0);
neilt6 6:55a26a56046a 338 } else {
neilt6 6:55a26a56046a 339 //Write the data block from the buffer
neilt6 6:55a26a56046a 340 for (int b = 0; b < 512; b++)
neilt6 6:55a26a56046a 341 m_SPI.write(buffer[b]);
neilt6 6:55a26a56046a 342
neilt6 6:55a26a56046a 343 //Calculate the CRC16 checksum for the data block and send it (if enabled)
neilt6 6:55a26a56046a 344 unsigned short crc = m_CrcEnabled ? CRC16((char*)buffer, 512) : 0xFFFF;
neilt6 6:55a26a56046a 345 m_SPI.write(crc >> 8);
neilt6 6:55a26a56046a 346 m_SPI.write(crc);
neilt6 6:55a26a56046a 347 }
neilt6 0:2a6d8a096edc 348
neilt6 0:2a6d8a096edc 349 //Receive the data response, and deselect the card
neilt6 0:2a6d8a096edc 350 char resp = m_SPI.write(0xFF) & 0x1F;
neilt6 0:2a6d8a096edc 351 deselect();
neilt6 0:2a6d8a096edc 352
neilt6 0:2a6d8a096edc 353 //Check the response
neilt6 0:2a6d8a096edc 354 if (resp == 0x05)
neilt6 0:2a6d8a096edc 355 return RES_OK;
neilt6 0:2a6d8a096edc 356 else if (resp == 0x0D)
neilt6 0:2a6d8a096edc 357 return RES_ERROR;
neilt6 0:2a6d8a096edc 358 } else {
neilt6 0:2a6d8a096edc 359 //The command failed
neilt6 0:2a6d8a096edc 360 return RES_ERROR;
neilt6 0:2a6d8a096edc 361 }
neilt6 0:2a6d8a096edc 362 }
neilt6 0:2a6d8a096edc 363
neilt6 0:2a6d8a096edc 364 //The operation either timed out 3 times, failed the CRC check 3 times, or experienced a write error
neilt6 0:2a6d8a096edc 365 return RES_ERROR;
neilt6 0:2a6d8a096edc 366 }
neilt6 0:2a6d8a096edc 367
neilt6 0:2a6d8a096edc 368 int SDFileSystem::disk_sync()
neilt6 0:2a6d8a096edc 369 {
neilt6 0:2a6d8a096edc 370 //Select the card so we're forced to wait for the end of any internal write processes
neilt6 0:2a6d8a096edc 371 bool ret = select();
neilt6 0:2a6d8a096edc 372 deselect();
neilt6 0:2a6d8a096edc 373
neilt6 0:2a6d8a096edc 374 //Return success/failure
neilt6 0:2a6d8a096edc 375 return (ret) ? RES_OK : RES_ERROR;
neilt6 0:2a6d8a096edc 376 }
neilt6 0:2a6d8a096edc 377
neilt6 0:2a6d8a096edc 378 uint64_t SDFileSystem::disk_sectors()
neilt6 0:2a6d8a096edc 379 {
neilt6 0:2a6d8a096edc 380 //Make sure the device is initialized before proceeding
neilt6 0:2a6d8a096edc 381 if (m_Status & STA_NOINIT)
neilt6 0:2a6d8a096edc 382 return 0;
neilt6 0:2a6d8a096edc 383
neilt6 0:2a6d8a096edc 384 //Try to read the CSD register up to 3 times
neilt6 0:2a6d8a096edc 385 for (int i = 0; i < 3; i++) {
neilt6 5:6befff2300d0 386 //Send CMD9(0x00000000) to read the CSD register
neilt6 5:6befff2300d0 387 if (writeCommand(CMD9, 0x00000000) == 0x00) {
neilt6 0:2a6d8a096edc 388 //Receive the 16B CSD data
neilt6 0:2a6d8a096edc 389 char csd[16];
neilt6 0:2a6d8a096edc 390 if (readData(csd, 16)) {
neilt6 0:2a6d8a096edc 391 //Calculate the sector count based on the card type
neilt6 0:2a6d8a096edc 392 if ((csd[0] >> 6) == 0x01) {
neilt6 0:2a6d8a096edc 393 //Calculate the sector count a high capacity card
neilt6 0:2a6d8a096edc 394 uint64_t sectors = (((csd[7] & 0x3F) << 16) | (csd[8] << 8) | csd[9]) + 1;
neilt6 0:2a6d8a096edc 395 return sectors << 10;
neilt6 0:2a6d8a096edc 396 } else {
neilt6 0:2a6d8a096edc 397 //Calculate the sector count standard capacity card
neilt6 0:2a6d8a096edc 398 uint64_t sectors = (((csd[6] & 0x03) << 10) | (csd[7] << 2) | ((csd[8] & 0xC0) >> 6)) + 1;
neilt6 0:2a6d8a096edc 399 sectors <<= ((((csd[9] & 0x03) << 1) | ((csd[10] & 0x80) >> 7)) + 2);
neilt6 0:2a6d8a096edc 400 sectors <<= (csd[5] & 0x0F);
neilt6 0:2a6d8a096edc 401 return sectors >> 9;
neilt6 0:2a6d8a096edc 402 }
neilt6 0:2a6d8a096edc 403 }
neilt6 0:2a6d8a096edc 404 } else {
neilt6 0:2a6d8a096edc 405 //The command failed
neilt6 0:2a6d8a096edc 406 return 0;
neilt6 0:2a6d8a096edc 407 }
neilt6 0:2a6d8a096edc 408 }
neilt6 0:2a6d8a096edc 409
neilt6 0:2a6d8a096edc 410 //The read operation failed 3 times (CRC most likely)
neilt6 0:2a6d8a096edc 411 return 0;
neilt6 0:2a6d8a096edc 412 }
neilt6 0:2a6d8a096edc 413
neilt6 0:2a6d8a096edc 414 void SDFileSystem::checkSocket()
neilt6 0:2a6d8a096edc 415 {
neilt6 0:2a6d8a096edc 416 //Check if a card is in the socket
neilt6 1:25f4ba436b81 417 if (m_CD == m_CD_ASSERT) {
neilt6 0:2a6d8a096edc 418 //The socket is occupied, clear the STA_NODISK flag
neilt6 0:2a6d8a096edc 419 m_Status &= ~STA_NODISK;
neilt6 0:2a6d8a096edc 420 } else {
neilt6 0:2a6d8a096edc 421 //The socket is empty
neilt6 0:2a6d8a096edc 422 m_Status |= (STA_NODISK | STA_NOINIT);
neilt6 0:2a6d8a096edc 423 m_CardType = CARD_NONE;
neilt6 0:2a6d8a096edc 424 }
neilt6 0:2a6d8a096edc 425 }
neilt6 0:2a6d8a096edc 426
neilt6 0:2a6d8a096edc 427 inline bool SDFileSystem::waitReady(int timeout)
neilt6 0:2a6d8a096edc 428 {
neilt6 0:2a6d8a096edc 429 //Wait for the specified timeout for the card to become ready
neilt6 0:2a6d8a096edc 430 for (int i = 0; i < timeout; i++) {
neilt6 0:2a6d8a096edc 431 if (m_SPI.write(0xFF) == 0xFF)
neilt6 0:2a6d8a096edc 432 return true;
neilt6 0:2a6d8a096edc 433 wait_ms(1);
neilt6 0:2a6d8a096edc 434 }
neilt6 0:2a6d8a096edc 435
neilt6 0:2a6d8a096edc 436 //We timed out
neilt6 0:2a6d8a096edc 437 return false;
neilt6 0:2a6d8a096edc 438 }
neilt6 0:2a6d8a096edc 439
neilt6 0:2a6d8a096edc 440 inline bool SDFileSystem::select()
neilt6 0:2a6d8a096edc 441 {
neilt6 0:2a6d8a096edc 442 //Pull /CS low
neilt6 0:2a6d8a096edc 443 m_CS = 0;
neilt6 0:2a6d8a096edc 444
neilt6 0:2a6d8a096edc 445 //Send a dummy clock to enable DO
neilt6 0:2a6d8a096edc 446 m_SPI.write(0xFF);
neilt6 0:2a6d8a096edc 447
neilt6 0:2a6d8a096edc 448 //Wait for up to 500ms for the card to become ready
neilt6 0:2a6d8a096edc 449 if (waitReady(500))
neilt6 0:2a6d8a096edc 450 return true;
neilt6 0:2a6d8a096edc 451
neilt6 0:2a6d8a096edc 452 //We timed out, deselect and return false
neilt6 0:2a6d8a096edc 453 deselect();
neilt6 0:2a6d8a096edc 454 return false;
neilt6 0:2a6d8a096edc 455 }
neilt6 0:2a6d8a096edc 456
neilt6 0:2a6d8a096edc 457 inline void SDFileSystem::deselect()
neilt6 0:2a6d8a096edc 458 {
neilt6 0:2a6d8a096edc 459 //Pull /CS high
neilt6 0:2a6d8a096edc 460 m_CS = 1;
neilt6 0:2a6d8a096edc 461
neilt6 0:2a6d8a096edc 462 //Send a dummy byte to release DO
neilt6 0:2a6d8a096edc 463 m_SPI.write(0xFF);
neilt6 0:2a6d8a096edc 464 }
neilt6 0:2a6d8a096edc 465
neilt6 0:2a6d8a096edc 466 char SDFileSystem::writeCommand(char cmd, unsigned int arg)
neilt6 0:2a6d8a096edc 467 {
neilt6 0:2a6d8a096edc 468 char resp;
neilt6 0:2a6d8a096edc 469
neilt6 0:2a6d8a096edc 470 //Try to send the command up to 3 times
neilt6 0:2a6d8a096edc 471 for (int i = 0; i < 3; i++) {
neilt6 5:6befff2300d0 472 //Send CMD55(0x00000000) prior to an application specific command
neilt6 5:6befff2300d0 473 if (cmd == ACMD41 || cmd == ACMD42) {
neilt6 5:6befff2300d0 474 resp = writeCommand(CMD55, 0x00000000);
neilt6 0:2a6d8a096edc 475 if (resp > 0x01)
neilt6 0:2a6d8a096edc 476 return resp;
neilt6 0:2a6d8a096edc 477 }
neilt6 0:2a6d8a096edc 478
neilt6 2:eec1db773e7d 479 //Select the card, and wait for ready
neilt6 0:2a6d8a096edc 480 if (!select())
neilt6 0:2a6d8a096edc 481 return 0xFF;
neilt6 0:2a6d8a096edc 482
neilt6 0:2a6d8a096edc 483 //Prepare the command packet
neilt6 0:2a6d8a096edc 484 char cmdPacket[6];
neilt6 4:49b29888eca7 485 cmdPacket[0] = cmd;
neilt6 0:2a6d8a096edc 486 cmdPacket[1] = arg >> 24;
neilt6 0:2a6d8a096edc 487 cmdPacket[2] = arg >> 16;
neilt6 0:2a6d8a096edc 488 cmdPacket[3] = arg >> 8;
neilt6 0:2a6d8a096edc 489 cmdPacket[4] = arg;
neilt6 6:55a26a56046a 490 if (m_CrcEnabled || cmd == CMD0 || cmd == CMD8)
neilt6 6:55a26a56046a 491 cmdPacket[5] = (CRC7(cmdPacket, 5) << 1) | 0x01;
neilt6 6:55a26a56046a 492 else
neilt6 6:55a26a56046a 493 cmdPacket[5] = 0x01;
neilt6 0:2a6d8a096edc 494
neilt6 0:2a6d8a096edc 495 //Send the command packet
neilt6 0:2a6d8a096edc 496 for (int b = 0; b < 6; b++)
neilt6 0:2a6d8a096edc 497 m_SPI.write(cmdPacket[b]);
neilt6 0:2a6d8a096edc 498
neilt6 0:2a6d8a096edc 499 //Allow up to 10 bytes of delay for the command response
neilt6 0:2a6d8a096edc 500 for (int b = 0; b < 10; b++) {
neilt6 0:2a6d8a096edc 501 resp = m_SPI.write(0xFF);
neilt6 0:2a6d8a096edc 502 if (!(resp & 0x80))
neilt6 0:2a6d8a096edc 503 break;
neilt6 0:2a6d8a096edc 504 }
neilt6 0:2a6d8a096edc 505
neilt6 2:eec1db773e7d 506 //Deselect the card on errors, or if the transaction is finished
neilt6 2:eec1db773e7d 507 if (resp > 0x01 || !(cmd == CMD8 || cmd == CMD9 || cmd == CMD17 || cmd == CMD24 || cmd == CMD55 || cmd == CMD58))
neilt6 0:2a6d8a096edc 508 deselect();
neilt6 0:2a6d8a096edc 509
neilt6 2:eec1db773e7d 510 //Return the response unless there were CRC errors
neilt6 0:2a6d8a096edc 511 if (resp == 0xFF || !(resp & (1 << 3)))
neilt6 0:2a6d8a096edc 512 return resp;
neilt6 0:2a6d8a096edc 513 }
neilt6 0:2a6d8a096edc 514
neilt6 0:2a6d8a096edc 515 //The command failed 3 times due to CRC errors
neilt6 0:2a6d8a096edc 516 return 0xFF;
neilt6 0:2a6d8a096edc 517 }
neilt6 0:2a6d8a096edc 518
neilt6 0:2a6d8a096edc 519 unsigned int SDFileSystem::readReturn()
neilt6 0:2a6d8a096edc 520 {
neilt6 0:2a6d8a096edc 521 unsigned int ret;
neilt6 0:2a6d8a096edc 522
neilt6 0:2a6d8a096edc 523 //Read the 32-bit response value
neilt6 0:2a6d8a096edc 524 ret = (m_SPI.write(0xFF) << 24);
neilt6 0:2a6d8a096edc 525 ret |= (m_SPI.write(0xFF) << 16);
neilt6 0:2a6d8a096edc 526 ret |= (m_SPI.write(0xFF) << 8);
neilt6 0:2a6d8a096edc 527 ret |= m_SPI.write(0xFF);
neilt6 0:2a6d8a096edc 528
neilt6 0:2a6d8a096edc 529 //Deselect the card
neilt6 0:2a6d8a096edc 530 deselect();
neilt6 0:2a6d8a096edc 531
neilt6 0:2a6d8a096edc 532 //Return the response value
neilt6 0:2a6d8a096edc 533 return ret;
neilt6 0:2a6d8a096edc 534 }
neilt6 0:2a6d8a096edc 535
neilt6 0:2a6d8a096edc 536 bool SDFileSystem::readData(char* buffer, int length)
neilt6 0:2a6d8a096edc 537 {
neilt6 0:2a6d8a096edc 538 char token;
neilt6 6:55a26a56046a 539 unsigned short crc;
neilt6 0:2a6d8a096edc 540
neilt6 0:2a6d8a096edc 541 //Wait for up to 200ms for the DataStart token to arrive
neilt6 0:2a6d8a096edc 542 for (int i = 0; i < 200; i++) {
neilt6 0:2a6d8a096edc 543 token = m_SPI.write(0xFF);
neilt6 0:2a6d8a096edc 544 if (token != 0xFF)
neilt6 0:2a6d8a096edc 545 break;
neilt6 0:2a6d8a096edc 546 wait_ms(1);
neilt6 0:2a6d8a096edc 547 }
neilt6 0:2a6d8a096edc 548
neilt6 0:2a6d8a096edc 549 //Make sure the token is valid
neilt6 6:55a26a56046a 550 if (token != 0xFE) {
neilt6 6:55a26a56046a 551 deselect();
neilt6 0:2a6d8a096edc 552 return false;
neilt6 6:55a26a56046a 553 }
neilt6 6:55a26a56046a 554
neilt6 6:55a26a56046a 555 //Check if large frames are enabled or not
neilt6 6:55a26a56046a 556 if (m_LargeFrames) {
neilt6 6:55a26a56046a 557 //Switch to 16-bit frames for better performance
neilt6 6:55a26a56046a 558 m_SPI.format(16, 0);
neilt6 0:2a6d8a096edc 559
neilt6 6:55a26a56046a 560 //Read the data into the buffer
neilt6 6:55a26a56046a 561 unsigned short dataWord;
neilt6 6:55a26a56046a 562 for (int i = 0; i < length; i += 2) {
neilt6 6:55a26a56046a 563 dataWord = m_SPI.write(0xFFFF);
neilt6 6:55a26a56046a 564 buffer[i] = dataWord >> 8;
neilt6 6:55a26a56046a 565 buffer[i + 1] = dataWord;
neilt6 6:55a26a56046a 566 }
neilt6 6:55a26a56046a 567
neilt6 6:55a26a56046a 568 //Read the CRC16 checksum for the data block
neilt6 6:55a26a56046a 569 crc = m_SPI.write(0xFFFF);
neilt6 0:2a6d8a096edc 570
neilt6 6:55a26a56046a 571 //Switch back to 8-bit frames
neilt6 6:55a26a56046a 572 m_SPI.format(8, 0);
neilt6 6:55a26a56046a 573 } else {
neilt6 6:55a26a56046a 574 //Read the data into the buffer
neilt6 6:55a26a56046a 575 for (int i = 0; i < length; i++)
neilt6 6:55a26a56046a 576 buffer[i] = m_SPI.write(0xFF);
neilt6 6:55a26a56046a 577
neilt6 6:55a26a56046a 578 //Read the CRC16 checksum for the data block
neilt6 6:55a26a56046a 579 crc = (m_SPI.write(0xFF) << 8);
neilt6 6:55a26a56046a 580 crc |= m_SPI.write(0xFF);
neilt6 6:55a26a56046a 581 }
neilt6 6:55a26a56046a 582
neilt6 6:55a26a56046a 583 //Deselect the card
neilt6 0:2a6d8a096edc 584 deselect();
neilt6 0:2a6d8a096edc 585
neilt6 6:55a26a56046a 586 //Verify the CRC16 checksum (if enabled)
neilt6 6:55a26a56046a 587 return (!m_CrcEnabled || crc == CRC16(buffer, length));
neilt6 0:2a6d8a096edc 588 }