Kevin Braun / Mbed 2 deprecated DDS60-105

Programming of the DDS-60 (AD9851) frequency synthesizer from AmQRP http://midnightdesignsolutions.com/dds60/index.html I had to use long, floating math in order to get accurate frequency output.

Dependencies:   TextLCD mbed ChaNFS

SDHCFileSystem.cpp@0:1ed24aaf786d, 2012-04-04 (annotated)

Committer:
loopsva
Date:
Wed Apr 04 18:14:54 2012 +0000
Revision:
0:1ed24aaf786d
050511

Who changed what in which revision?

UserRevisionLine numberNew contents of line
loopsva 0:1ed24aaf786d 1 /* mbed SDFileSystem Library, for providing file access to SD cards
loopsva 0:1ed24aaf786d 2 * Copyright (c) 2008-2010, sford
loopsva 0:1ed24aaf786d 3 *
loopsva 0:1ed24aaf786d 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
loopsva 0:1ed24aaf786d 5 * of this software and associated documentation files (the "Software"), to deal
loopsva 0:1ed24aaf786d 6 * in the Software without restriction, including without limitation the rights
loopsva 0:1ed24aaf786d 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
loopsva 0:1ed24aaf786d 8 * copies of the Software, and to permit persons to whom the Software is
loopsva 0:1ed24aaf786d 9 * furnished to do so, subject to the following conditions:
loopsva 0:1ed24aaf786d 10 *
loopsva 0:1ed24aaf786d 11 * The above copyright notice and this permission notice shall be included in
loopsva 0:1ed24aaf786d 12 * all copies or substantial portions of the Software.
loopsva 0:1ed24aaf786d 13 *
loopsva 0:1ed24aaf786d 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
loopsva 0:1ed24aaf786d 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
loopsva 0:1ed24aaf786d 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
loopsva 0:1ed24aaf786d 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
loopsva 0:1ed24aaf786d 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
loopsva 0:1ed24aaf786d 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
loopsva 0:1ed24aaf786d 20 * THE SOFTWARE.
loopsva 0:1ed24aaf786d 21 */
loopsva 0:1ed24aaf786d 22
loopsva 0:1ed24aaf786d 23 /* Introduction
loopsva 0:1ed24aaf786d 24 * ------------
loopsva 0:1ed24aaf786d 25 * SD and MMC cards support a number of interfaces, but common to them all
loopsva 0:1ed24aaf786d 26 * is one based on SPI. This is the one I'm implmenting because it means
loopsva 0:1ed24aaf786d 27 * it is much more portable even though not so performant, and we already
loopsva 0:1ed24aaf786d 28 * have the mbed SPI Interface!
loopsva 0:1ed24aaf786d 29 *
loopsva 0:1ed24aaf786d 30 * The main reference I'm using is Chapter 7, "SPI Mode" of:
loopsva 0:1ed24aaf786d 31 * http://www.sdcard.org/developers/tech/sdcard/pls/Simplified_Physical_Layer_Spec.pdf
loopsva 0:1ed24aaf786d 32 *
loopsva 0:1ed24aaf786d 33 * SPI Startup
loopsva 0:1ed24aaf786d 34 * -----------
loopsva 0:1ed24aaf786d 35 * The SD card powers up in SD mode. The SPI interface mode is selected by
loopsva 0:1ed24aaf786d 36 * asserting CS low and sending the reset command (CMD0). The card will
loopsva 0:1ed24aaf786d 37 * respond with a (R1) response.
loopsva 0:1ed24aaf786d 38 *
loopsva 0:1ed24aaf786d 39 * CMD8 is optionally sent to determine the voltage range supported, and
loopsva 0:1ed24aaf786d 40 * indirectly determine whether it is a version 1.x SD/non-SD card or
loopsva 0:1ed24aaf786d 41 * version 2.x. I'll just ignore this for now.
loopsva 0:1ed24aaf786d 42 *
loopsva 0:1ed24aaf786d 43 * ACMD41 is repeatedly issued to initialise the card, until "in idle"
loopsva 0:1ed24aaf786d 44 * (bit 0) of the R1 response goes to '0', indicating it is initialised.
loopsva 0:1ed24aaf786d 45 *
loopsva 0:1ed24aaf786d 46 * You should also indicate whether the host supports High Capicity cards,
loopsva 0:1ed24aaf786d 47 * and check whether the card is high capacity - i'll also ignore this
loopsva 0:1ed24aaf786d 48 *
loopsva 0:1ed24aaf786d 49 * SPI Protocol
loopsva 0:1ed24aaf786d 50 * ------------
loopsva 0:1ed24aaf786d 51 * The SD SPI protocol is based on transactions made up of 8-bit words, with
loopsva 0:1ed24aaf786d 52 * the host starting every bus transaction by asserting the CS signal low. The
loopsva 0:1ed24aaf786d 53 * card always responds to commands, data blocks and errors.
loopsva 0:1ed24aaf786d 54 *
loopsva 0:1ed24aaf786d 55 * The protocol supports a CRC, but by default it is off (except for the
loopsva 0:1ed24aaf786d 56 * first reset CMD0, where the CRC can just be pre-calculated, and CMD8)
loopsva 0:1ed24aaf786d 57 * I'll leave the CRC off I think!
loopsva 0:1ed24aaf786d 58 *
loopsva 0:1ed24aaf786d 59 * Standard capacity cards have variable data block sizes, whereas High
loopsva 0:1ed24aaf786d 60 * Capacity cards fix the size of data block to 512 bytes. I'll therefore
loopsva 0:1ed24aaf786d 61 * just always use the Standard Capacity cards with a block size of 512 bytes.
loopsva 0:1ed24aaf786d 62 * This is set with CMD16.
loopsva 0:1ed24aaf786d 63 *
loopsva 0:1ed24aaf786d 64 * You can read and write single blocks (CMD17, CMD25) or multiple blocks
loopsva 0:1ed24aaf786d 65 * (CMD18, CMD25). For simplicity, I'll just use single block accesses. When
loopsva 0:1ed24aaf786d 66 * the card gets a read command, it responds with a response token, and then
loopsva 0:1ed24aaf786d 67 * a data token or an error.
loopsva 0:1ed24aaf786d 68 *
loopsva 0:1ed24aaf786d 69 * SPI Command Format
loopsva 0:1ed24aaf786d 70 * ------------------
loopsva 0:1ed24aaf786d 71 * Commands are 6-bytes long, containing the command, 32-bit argument, and CRC.
loopsva 0:1ed24aaf786d 72 *
loopsva 0:1ed24aaf786d 73 * +---------------+------------+------------+-----------+----------+--------------+
loopsva 0:1ed24aaf786d 74 * | 01 | cmd[5:0] | arg[31:24] | arg[23:16] | arg[15:8] | arg[7:0] | crc[6:0] | 1 |
loopsva 0:1ed24aaf786d 75 * +---------------+------------+------------+-----------+----------+--------------+
loopsva 0:1ed24aaf786d 76 *
loopsva 0:1ed24aaf786d 77 * As I'm not using CRC, I can fix that byte to what is needed for CMD0 (0x95)
loopsva 0:1ed24aaf786d 78 *
loopsva 0:1ed24aaf786d 79 * All Application Specific commands shall be preceded with APP_CMD (CMD55).
loopsva 0:1ed24aaf786d 80 *
loopsva 0:1ed24aaf786d 81 * SPI Response Format
loopsva 0:1ed24aaf786d 82 * -------------------
loopsva 0:1ed24aaf786d 83 * The main response format (R1) is a status byte (normally zero). Key flags:
loopsva 0:1ed24aaf786d 84 * idle - 1 if the card is in an idle state/initialising
loopsva 0:1ed24aaf786d 85 * cmd - 1 if an illegal command code was detected
loopsva 0:1ed24aaf786d 86 *
loopsva 0:1ed24aaf786d 87 * +-------------------------------------------------+
loopsva 0:1ed24aaf786d 88 * R1 | 0 | arg | addr | seq | crc | cmd | erase | idle |
loopsva 0:1ed24aaf786d 89 * +-------------------------------------------------+
loopsva 0:1ed24aaf786d 90 *
loopsva 0:1ed24aaf786d 91 * R1b is the same, except it is followed by a busy signal (zeros) until
loopsva 0:1ed24aaf786d 92 * the first non-zero byte when it is ready again.
loopsva 0:1ed24aaf786d 93 *
loopsva 0:1ed24aaf786d 94 * Data Response Token
loopsva 0:1ed24aaf786d 95 * -------------------
loopsva 0:1ed24aaf786d 96 * Every data block written to the card is acknowledged by a byte
loopsva 0:1ed24aaf786d 97 * response token
loopsva 0:1ed24aaf786d 98 *
loopsva 0:1ed24aaf786d 99 * +----------------------+
loopsva 0:1ed24aaf786d 100 * | xxx | 0 | status | 1 |
loopsva 0:1ed24aaf786d 101 * +----------------------+
loopsva 0:1ed24aaf786d 102 * 010 - OK!
loopsva 0:1ed24aaf786d 103 * 101 - CRC Error
loopsva 0:1ed24aaf786d 104 * 110 - Write Error
loopsva 0:1ed24aaf786d 105 *
loopsva 0:1ed24aaf786d 106 * Single Block Read and Write
loopsva 0:1ed24aaf786d 107 * ---------------------------
loopsva 0:1ed24aaf786d 108 *
loopsva 0:1ed24aaf786d 109 * Block transfers have a byte header, followed by the data, followed
loopsva 0:1ed24aaf786d 110 * by a 16-bit CRC. In our case, the data will always be 512 bytes.
loopsva 0:1ed24aaf786d 111 *
loopsva 0:1ed24aaf786d 112 * +------+---------+---------+- - - -+---------+-----------+----------+
loopsva 0:1ed24aaf786d 113 * | 0xFE | data[0] | data[1] | | data[n] | crc[15:8] | crc[7:0] |
loopsva 0:1ed24aaf786d 114 * +------+---------+---------+- - - -+---------+-----------+----------+
loopsva 0:1ed24aaf786d 115 */
loopsva 0:1ed24aaf786d 116
loopsva 0:1ed24aaf786d 117 /*
loopsva 0:1ed24aaf786d 118 * Comment: Changes for SDHC support till 32GB
loopsva 0:1ed24aaf786d 119 * Name: KB
loopsva 0:1ed24aaf786d 120 * Date: 07/24/2010
loopsva 0:1ed24aaf786d 121 * Release: 0.1
loopsva 0:1ed24aaf786d 122 */
loopsva 0:1ed24aaf786d 123
loopsva 0:1ed24aaf786d 124 #include "SDHCFileSystem.h"
loopsva 0:1ed24aaf786d 125
loopsva 0:1ed24aaf786d 126 #define DEBUG
loopsva 0:1ed24aaf786d 127 #define SD_COMMAND_TIMEOUT 5000
loopsva 0:1ed24aaf786d 128
loopsva 0:1ed24aaf786d 129
loopsva 0:1ed24aaf786d 130 SDFileSystem::SDFileSystem(PinName mosi, PinName miso, PinName sclk, PinName cs, const char* name) :
loopsva 0:1ed24aaf786d 131 FATFileSystem(name), _spi(mosi, miso, sclk), _cs(cs) {
loopsva 0:1ed24aaf786d 132 _cs = 1;
loopsva 0:1ed24aaf786d 133 }
loopsva 0:1ed24aaf786d 134
loopsva 0:1ed24aaf786d 135 #define R1_IDLE_STATE (1 << 0)
loopsva 0:1ed24aaf786d 136 #define R1_ERASE_RESET (1 << 1)
loopsva 0:1ed24aaf786d 137 #define R1_ILLEGAL_COMMAND (1 << 2)
loopsva 0:1ed24aaf786d 138 #define R1_COM_CRC_ERROR (1 << 3)
loopsva 0:1ed24aaf786d 139 #define R1_ERASE_SEQUENCE_ERROR (1 << 4)
loopsva 0:1ed24aaf786d 140 #define R1_ADDRESS_ERROR (1 << 5)
loopsva 0:1ed24aaf786d 141 #define R1_PARAMETER_ERROR (1 << 6)
loopsva 0:1ed24aaf786d 142
loopsva 0:1ed24aaf786d 143 // Types
loopsva 0:1ed24aaf786d 144 // - v1.x Standard Capacity
loopsva 0:1ed24aaf786d 145 // - v2.x Standard Capacity
loopsva 0:1ed24aaf786d 146 // - v2.x High Capacity
loopsva 0:1ed24aaf786d 147 // - Not recognised as an SD Card
loopsva 0:1ed24aaf786d 148
loopsva 0:1ed24aaf786d 149 #define SDCARD_FAIL 0
loopsva 0:1ed24aaf786d 150 #define SDCARD_V1 1
loopsva 0:1ed24aaf786d 151 #define SDCARD_V2 2
loopsva 0:1ed24aaf786d 152 #define SDCARD_V2HC 3
loopsva 0:1ed24aaf786d 153
loopsva 0:1ed24aaf786d 154 int SDFileSystem::initialise_card() {
loopsva 0:1ed24aaf786d 155 // Set to 100kHz for initialisation, and clock card with cs = 1
loopsva 0:1ed24aaf786d 156 _spi.frequency(100000);
loopsva 0:1ed24aaf786d 157 _cs = 1;
loopsva 0:1ed24aaf786d 158 for(int i=0; i<16; i++) {
loopsva 0:1ed24aaf786d 159 _spi.write(0xFF);
loopsva 0:1ed24aaf786d 160 }
loopsva 0:1ed24aaf786d 161
loopsva 0:1ed24aaf786d 162 // send CMD0, should return with all zeros except IDLE STATE set (bit 0)
loopsva 0:1ed24aaf786d 163 if(_cmd(0, 0) != R1_IDLE_STATE) {
loopsva 0:1ed24aaf786d 164 fprintf(stderr, "No disk, or could not put SD card in to SPI idle state\n");
loopsva 0:1ed24aaf786d 165 return SDCARD_FAIL;
loopsva 0:1ed24aaf786d 166 }
loopsva 0:1ed24aaf786d 167
loopsva 0:1ed24aaf786d 168 // send CMD8 to determine whther it is ver 2.x
loopsva 0:1ed24aaf786d 169 int r = _cmd8();
loopsva 0:1ed24aaf786d 170 if(r == R1_IDLE_STATE) {
loopsva 0:1ed24aaf786d 171 return initialise_card_v2();
loopsva 0:1ed24aaf786d 172 } else if(r == (R1_IDLE_STATE | R1_ILLEGAL_COMMAND)) {
loopsva 0:1ed24aaf786d 173 return initialise_card_v1();
loopsva 0:1ed24aaf786d 174 } else {
loopsva 0:1ed24aaf786d 175 fprintf(stderr, "Not in idle state after sending CMD8 (not an SD card?)\n");
loopsva 0:1ed24aaf786d 176 return SDCARD_FAIL;
loopsva 0:1ed24aaf786d 177 }
loopsva 0:1ed24aaf786d 178 }
loopsva 0:1ed24aaf786d 179
loopsva 0:1ed24aaf786d 180 int SDFileSystem::initialise_card_v1() {
loopsva 0:1ed24aaf786d 181 for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
loopsva 0:1ed24aaf786d 182 _cmd(55, 0);
loopsva 0:1ed24aaf786d 183 if(_cmd(41, 0) == 0) {
loopsva 0:1ed24aaf786d 184 cdv = 512;
loopsva 0:1ed24aaf786d 185 #ifdef DEBUG
loopsva 0:1ed24aaf786d 186 printf("Init: SEDCARD_V1\n");
loopsva 0:1ed24aaf786d 187 #endif
loopsva 0:1ed24aaf786d 188 return SDCARD_V1;
loopsva 0:1ed24aaf786d 189 }
loopsva 0:1ed24aaf786d 190 }
loopsva 0:1ed24aaf786d 191
loopsva 0:1ed24aaf786d 192 fprintf(stderr, "Timeout waiting for v1.x card\n");
loopsva 0:1ed24aaf786d 193 return SDCARD_FAIL;
loopsva 0:1ed24aaf786d 194 }
loopsva 0:1ed24aaf786d 195
loopsva 0:1ed24aaf786d 196 int SDFileSystem::initialise_card_v2() {
loopsva 0:1ed24aaf786d 197
loopsva 0:1ed24aaf786d 198 for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
loopsva 0:1ed24aaf786d 199 wait_ms(50);
loopsva 0:1ed24aaf786d 200 _cmd58();
loopsva 0:1ed24aaf786d 201 _cmd(55, 0);
loopsva 0:1ed24aaf786d 202 if(_cmd(41, 0x40000000) == 0) {
loopsva 0:1ed24aaf786d 203 _cmd58();
loopsva 0:1ed24aaf786d 204 #ifdef DEBUG
loopsva 0:1ed24aaf786d 205 printf("Init: SDCARD_V2\n");
loopsva 0:1ed24aaf786d 206 #endif
loopsva 0:1ed24aaf786d 207 cdv = 1;
loopsva 0:1ed24aaf786d 208 return SDCARD_V2;
loopsva 0:1ed24aaf786d 209 }
loopsva 0:1ed24aaf786d 210 }
loopsva 0:1ed24aaf786d 211
loopsva 0:1ed24aaf786d 212 fprintf(stderr, "Timeout waiting for v2.x card\n");
loopsva 0:1ed24aaf786d 213 return SDCARD_FAIL;
loopsva 0:1ed24aaf786d 214 }
loopsva 0:1ed24aaf786d 215
loopsva 0:1ed24aaf786d 216 int SDFileSystem::disk_initialize() {
loopsva 0:1ed24aaf786d 217
loopsva 0:1ed24aaf786d 218 int i = initialise_card();
loopsva 0:1ed24aaf786d 219 #ifdef DEBUG
loopsva 0:1ed24aaf786d 220 printf("init card = %d\n", i);
loopsva 0:1ed24aaf786d 221 #endif
loopsva 0:1ed24aaf786d 222 _sectors = _sd_sectors();
loopsva 0:1ed24aaf786d 223
loopsva 0:1ed24aaf786d 224 // Set block length to 512 (CMD16)
loopsva 0:1ed24aaf786d 225 if(_cmd(16, 512) != 0) {
loopsva 0:1ed24aaf786d 226 fprintf(stderr, "Set 512-byte block timed out\n");
loopsva 0:1ed24aaf786d 227 return 1;
loopsva 0:1ed24aaf786d 228 }
loopsva 0:1ed24aaf786d 229
loopsva 0:1ed24aaf786d 230 _spi.frequency(1000000); // Set to 1MHz for data transfer
loopsva 0:1ed24aaf786d 231 return 0;
loopsva 0:1ed24aaf786d 232 }
loopsva 0:1ed24aaf786d 233
loopsva 0:1ed24aaf786d 234 int SDFileSystem::disk_write(const char *buffer, int block_number) {
loopsva 0:1ed24aaf786d 235 // set write address for single block (CMD24)
loopsva 0:1ed24aaf786d 236 if(_cmd(24, block_number * cdv) != 0) {
loopsva 0:1ed24aaf786d 237 return 1;
loopsva 0:1ed24aaf786d 238 }
loopsva 0:1ed24aaf786d 239
loopsva 0:1ed24aaf786d 240 // send the data block
loopsva 0:1ed24aaf786d 241 _write(buffer, 512);
loopsva 0:1ed24aaf786d 242 return 0;
loopsva 0:1ed24aaf786d 243 }
loopsva 0:1ed24aaf786d 244
loopsva 0:1ed24aaf786d 245 int SDFileSystem::disk_read(char *buffer, int block_number) {
loopsva 0:1ed24aaf786d 246 // set read address for single block (CMD17)
loopsva 0:1ed24aaf786d 247 if(_cmd(17, block_number * cdv) != 0) {
loopsva 0:1ed24aaf786d 248 return 1;
loopsva 0:1ed24aaf786d 249 }
loopsva 0:1ed24aaf786d 250
loopsva 0:1ed24aaf786d 251 // receive the data
loopsva 0:1ed24aaf786d 252 _read(buffer, 512);
loopsva 0:1ed24aaf786d 253 return 0;
loopsva 0:1ed24aaf786d 254 }
loopsva 0:1ed24aaf786d 255
loopsva 0:1ed24aaf786d 256 int SDFileSystem::disk_status() { return 0; }
loopsva 0:1ed24aaf786d 257 int SDFileSystem::disk_sync() { return 0; }
loopsva 0:1ed24aaf786d 258 int SDFileSystem::disk_sectors() { return _sectors; }
loopsva 0:1ed24aaf786d 259
loopsva 0:1ed24aaf786d 260 // PRIVATE FUNCTIONS
loopsva 0:1ed24aaf786d 261
loopsva 0:1ed24aaf786d 262 int SDFileSystem::_cmd(int cmd, int arg) {
loopsva 0:1ed24aaf786d 263 _cs = 0;
loopsva 0:1ed24aaf786d 264
loopsva 0:1ed24aaf786d 265 // send a command
loopsva 0:1ed24aaf786d 266 _spi.write(0x40 | cmd);
loopsva 0:1ed24aaf786d 267 _spi.write(arg >> 24);
loopsva 0:1ed24aaf786d 268 _spi.write(arg >> 16);
loopsva 0:1ed24aaf786d 269 _spi.write(arg >> 8);
loopsva 0:1ed24aaf786d 270 _spi.write(arg >> 0);
loopsva 0:1ed24aaf786d 271 _spi.write(0x95);
loopsva 0:1ed24aaf786d 272
loopsva 0:1ed24aaf786d 273 // wait for the repsonse (response[7] == 0)
loopsva 0:1ed24aaf786d 274 for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
loopsva 0:1ed24aaf786d 275 int response = _spi.write(0xFF);
loopsva 0:1ed24aaf786d 276 if(!(response & 0x80)) {
loopsva 0:1ed24aaf786d 277 _cs = 1;
loopsva 0:1ed24aaf786d 278 _spi.write(0xFF);
loopsva 0:1ed24aaf786d 279 return response;
loopsva 0:1ed24aaf786d 280 }
loopsva 0:1ed24aaf786d 281 }
loopsva 0:1ed24aaf786d 282 _cs = 1;
loopsva 0:1ed24aaf786d 283 _spi.write(0xFF);
loopsva 0:1ed24aaf786d 284 return -1; // timeout
loopsva 0:1ed24aaf786d 285 }
loopsva 0:1ed24aaf786d 286 int SDFileSystem::_cmdx(int cmd, int arg) {
loopsva 0:1ed24aaf786d 287 _cs = 0;
loopsva 0:1ed24aaf786d 288
loopsva 0:1ed24aaf786d 289 // send a command
loopsva 0:1ed24aaf786d 290 _spi.write(0x40 | cmd);
loopsva 0:1ed24aaf786d 291 _spi.write(arg >> 24);
loopsva 0:1ed24aaf786d 292 _spi.write(arg >> 16);
loopsva 0:1ed24aaf786d 293 _spi.write(arg >> 8);
loopsva 0:1ed24aaf786d 294 _spi.write(arg >> 0);
loopsva 0:1ed24aaf786d 295 _spi.write(0x95);
loopsva 0:1ed24aaf786d 296
loopsva 0:1ed24aaf786d 297 // wait for the repsonse (response[7] == 0)
loopsva 0:1ed24aaf786d 298 for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
loopsva 0:1ed24aaf786d 299 int response = _spi.write(0xFF);
loopsva 0:1ed24aaf786d 300 if(!(response & 0x80)) {
loopsva 0:1ed24aaf786d 301 return response;
loopsva 0:1ed24aaf786d 302 }
loopsva 0:1ed24aaf786d 303 }
loopsva 0:1ed24aaf786d 304 _cs = 1;
loopsva 0:1ed24aaf786d 305 _spi.write(0xFF);
loopsva 0:1ed24aaf786d 306 return -1; // timeout
loopsva 0:1ed24aaf786d 307 }
loopsva 0:1ed24aaf786d 308
loopsva 0:1ed24aaf786d 309
loopsva 0:1ed24aaf786d 310 int SDFileSystem::_cmd58() {
loopsva 0:1ed24aaf786d 311 _cs = 0;
loopsva 0:1ed24aaf786d 312 int arg = 0;
loopsva 0:1ed24aaf786d 313
loopsva 0:1ed24aaf786d 314 // send a command
loopsva 0:1ed24aaf786d 315 _spi.write(0x40 | 58);
loopsva 0:1ed24aaf786d 316 _spi.write(arg >> 24);
loopsva 0:1ed24aaf786d 317 _spi.write(arg >> 16);
loopsva 0:1ed24aaf786d 318 _spi.write(arg >> 8);
loopsva 0:1ed24aaf786d 319 _spi.write(arg >> 0);
loopsva 0:1ed24aaf786d 320 _spi.write(0x95);
loopsva 0:1ed24aaf786d 321
loopsva 0:1ed24aaf786d 322 // wait for the repsonse (response[7] == 0)
loopsva 0:1ed24aaf786d 323 for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
loopsva 0:1ed24aaf786d 324 int response = _spi.write(0xFF);
loopsva 0:1ed24aaf786d 325 if(!(response & 0x80)) {
loopsva 0:1ed24aaf786d 326 int ocr = _spi.write(0xFF) << 24;
loopsva 0:1ed24aaf786d 327 ocr |= _spi.write(0xFF) << 16;
loopsva 0:1ed24aaf786d 328 ocr |= _spi.write(0xFF) << 8;
loopsva 0:1ed24aaf786d 329 ocr |= _spi.write(0xFF) << 0;
loopsva 0:1ed24aaf786d 330 // printf("OCR = 0x%08X\n", ocr);
loopsva 0:1ed24aaf786d 331 _cs = 1;
loopsva 0:1ed24aaf786d 332 _spi.write(0xFF);
loopsva 0:1ed24aaf786d 333 return response;
loopsva 0:1ed24aaf786d 334 }
loopsva 0:1ed24aaf786d 335 }
loopsva 0:1ed24aaf786d 336 _cs = 1;
loopsva 0:1ed24aaf786d 337 _spi.write(0xFF);
loopsva 0:1ed24aaf786d 338 return -1; // timeout
loopsva 0:1ed24aaf786d 339 }
loopsva 0:1ed24aaf786d 340
loopsva 0:1ed24aaf786d 341 int SDFileSystem::_cmd8() {
loopsva 0:1ed24aaf786d 342 _cs = 0;
loopsva 0:1ed24aaf786d 343
loopsva 0:1ed24aaf786d 344 // send a command
loopsva 0:1ed24aaf786d 345 _spi.write(0x40 | 8); // CMD8
loopsva 0:1ed24aaf786d 346 _spi.write(0x00); // reserved
loopsva 0:1ed24aaf786d 347 _spi.write(0x00); // reserved
loopsva 0:1ed24aaf786d 348 _spi.write(0x01); // 3.3v
loopsva 0:1ed24aaf786d 349 _spi.write(0xAA); // check pattern
loopsva 0:1ed24aaf786d 350 _spi.write(0x87); // crc
loopsva 0:1ed24aaf786d 351
loopsva 0:1ed24aaf786d 352 // wait for the repsonse (response[7] == 0)
loopsva 0:1ed24aaf786d 353 for(int i=0; i<SD_COMMAND_TIMEOUT * 1000; i++) {
loopsva 0:1ed24aaf786d 354 char response[5];
loopsva 0:1ed24aaf786d 355 response[0] = _spi.write(0xFF);
loopsva 0:1ed24aaf786d 356 if(!(response[0] & 0x80)) {
loopsva 0:1ed24aaf786d 357 for(int j=1; j<5; j++) {
loopsva 0:1ed24aaf786d 358 response[i] = _spi.write(0xFF);
loopsva 0:1ed24aaf786d 359 }
loopsva 0:1ed24aaf786d 360 _cs = 1;
loopsva 0:1ed24aaf786d 361 _spi.write(0xFF);
loopsva 0:1ed24aaf786d 362 return response[0];
loopsva 0:1ed24aaf786d 363 }
loopsva 0:1ed24aaf786d 364 }
loopsva 0:1ed24aaf786d 365 _cs = 1;
loopsva 0:1ed24aaf786d 366 _spi.write(0xFF);
loopsva 0:1ed24aaf786d 367 return -1; // timeout
loopsva 0:1ed24aaf786d 368 }
loopsva 0:1ed24aaf786d 369
loopsva 0:1ed24aaf786d 370 int SDFileSystem::_read(char *buffer, int length) {
loopsva 0:1ed24aaf786d 371 _cs = 0;
loopsva 0:1ed24aaf786d 372
loopsva 0:1ed24aaf786d 373 // read until start byte (0xFF)
loopsva 0:1ed24aaf786d 374 while(_spi.write(0xFF) != 0xFE);
loopsva 0:1ed24aaf786d 375
loopsva 0:1ed24aaf786d 376 // read data
loopsva 0:1ed24aaf786d 377 for(int i=0; i<length; i++) {
loopsva 0:1ed24aaf786d 378 buffer[i] = _spi.write(0xFF);
loopsva 0:1ed24aaf786d 379 }
loopsva 0:1ed24aaf786d 380 _spi.write(0xFF); // checksum
loopsva 0:1ed24aaf786d 381 _spi.write(0xFF);
loopsva 0:1ed24aaf786d 382
loopsva 0:1ed24aaf786d 383 _cs = 1;
loopsva 0:1ed24aaf786d 384 _spi.write(0xFF);
loopsva 0:1ed24aaf786d 385 return 0;
loopsva 0:1ed24aaf786d 386 }
loopsva 0:1ed24aaf786d 387
loopsva 0:1ed24aaf786d 388 int SDFileSystem::_write(const char *buffer, int length) {
loopsva 0:1ed24aaf786d 389 _cs = 0;
loopsva 0:1ed24aaf786d 390
loopsva 0:1ed24aaf786d 391 // indicate start of block
loopsva 0:1ed24aaf786d 392 _spi.write(0xFE);
loopsva 0:1ed24aaf786d 393
loopsva 0:1ed24aaf786d 394 // write the data
loopsva 0:1ed24aaf786d 395 for(int i=0; i<length; i++) {
loopsva 0:1ed24aaf786d 396 _spi.write(buffer[i]);
loopsva 0:1ed24aaf786d 397 }
loopsva 0:1ed24aaf786d 398
loopsva 0:1ed24aaf786d 399 // write the checksum
loopsva 0:1ed24aaf786d 400 _spi.write(0xFF);
loopsva 0:1ed24aaf786d 401 _spi.write(0xFF);
loopsva 0:1ed24aaf786d 402
loopsva 0:1ed24aaf786d 403 // check the repsonse token
loopsva 0:1ed24aaf786d 404 if((_spi.write(0xFF) & 0x1F) != 0x05) {
loopsva 0:1ed24aaf786d 405 _cs = 1;
loopsva 0:1ed24aaf786d 406 _spi.write(0xFF);
loopsva 0:1ed24aaf786d 407 return 1;
loopsva 0:1ed24aaf786d 408 }
loopsva 0:1ed24aaf786d 409
loopsva 0:1ed24aaf786d 410 // wait for write to finish
loopsva 0:1ed24aaf786d 411 while(_spi.write(0xFF) == 0);
loopsva 0:1ed24aaf786d 412
loopsva 0:1ed24aaf786d 413 _cs = 1;
loopsva 0:1ed24aaf786d 414 _spi.write(0xFF);
loopsva 0:1ed24aaf786d 415 return 0;
loopsva 0:1ed24aaf786d 416 }
loopsva 0:1ed24aaf786d 417
loopsva 0:1ed24aaf786d 418 static int ext_bits(char *data, int msb, int lsb) {
loopsva 0:1ed24aaf786d 419 int bits = 0;
loopsva 0:1ed24aaf786d 420 int size = 1 + msb - lsb;
loopsva 0:1ed24aaf786d 421 for(int i=0; i<size; i++) {
loopsva 0:1ed24aaf786d 422 int position = lsb + i;
loopsva 0:1ed24aaf786d 423 int byte = 15 - (position >> 3);
loopsva 0:1ed24aaf786d 424 int bit = position & 0x7;
loopsva 0:1ed24aaf786d 425 int value = (data[byte] >> bit) & 1;
loopsva 0:1ed24aaf786d 426 bits |= value << i;
loopsva 0:1ed24aaf786d 427 }
loopsva 0:1ed24aaf786d 428 return bits;
loopsva 0:1ed24aaf786d 429 }
loopsva 0:1ed24aaf786d 430
loopsva 0:1ed24aaf786d 431 int SDFileSystem::_sd_sectors() {
loopsva 0:1ed24aaf786d 432
loopsva 0:1ed24aaf786d 433 int c_size, c_size_mult, read_bl_len;
loopsva 0:1ed24aaf786d 434 int block_len, mult, blocknr, capacity;
loopsva 0:1ed24aaf786d 435 int blocks, hc_c_size;
loopsva 0:1ed24aaf786d 436 uint64_t hc_capacity;
loopsva 0:1ed24aaf786d 437
loopsva 0:1ed24aaf786d 438 // CMD9, Response R2 (R1 byte + 16-byte block read)
loopsva 0:1ed24aaf786d 439 if(_cmdx(9, 0) != 0) {
loopsva 0:1ed24aaf786d 440 fprintf(stderr, "Didn't get a response from the disk\n");
loopsva 0:1ed24aaf786d 441 return 0;
loopsva 0:1ed24aaf786d 442 }
loopsva 0:1ed24aaf786d 443
loopsva 0:1ed24aaf786d 444 char csd[16];
loopsva 0:1ed24aaf786d 445 if(_read(csd, 16) != 0) {
loopsva 0:1ed24aaf786d 446 fprintf(stderr, "Couldn't read csd response from disk\n");
loopsva 0:1ed24aaf786d 447 return 0;
loopsva 0:1ed24aaf786d 448 }
loopsva 0:1ed24aaf786d 449
loopsva 0:1ed24aaf786d 450 // csd_structure : csd[127:126]
loopsva 0:1ed24aaf786d 451 // c_size : csd[73:62]
loopsva 0:1ed24aaf786d 452 // c_size_mult : csd[49:47]
loopsva 0:1ed24aaf786d 453 // read_bl_len : csd[83:80] - the *maximum* read block length
loopsva 0:1ed24aaf786d 454
loopsva 0:1ed24aaf786d 455 int csd_structure = ext_bits(csd, 127, 126);
loopsva 0:1ed24aaf786d 456
loopsva 0:1ed24aaf786d 457 #ifdef DEBUG
loopsva 0:1ed24aaf786d 458 printf("CSD_STRUCT = %d\n", csd_structure);
loopsva 0:1ed24aaf786d 459 #endif
loopsva 0:1ed24aaf786d 460
loopsva 0:1ed24aaf786d 461 switch (csd_structure){
loopsva 0:1ed24aaf786d 462 case 0:
loopsva 0:1ed24aaf786d 463 cdv = 512;
loopsva 0:1ed24aaf786d 464 c_size = ext_bits(csd, 73, 62);
loopsva 0:1ed24aaf786d 465 c_size_mult = ext_bits(csd, 49, 47);
loopsva 0:1ed24aaf786d 466 read_bl_len = ext_bits(csd, 83, 80);
loopsva 0:1ed24aaf786d 467
loopsva 0:1ed24aaf786d 468 block_len = 1 << read_bl_len;
loopsva 0:1ed24aaf786d 469 mult = 1 << (c_size_mult + 2);
loopsva 0:1ed24aaf786d 470 blocknr = (c_size + 1) * mult;
loopsva 0:1ed24aaf786d 471 capacity = blocknr * block_len;
loopsva 0:1ed24aaf786d 472 blocks = capacity / 512;
loopsva 0:1ed24aaf786d 473 #ifdef DEBUG
loopsva 0:1ed24aaf786d 474 printf("SDCard\n\rc_size: %.4X \n\rcapacity: %.ld \n\rsectors: %d\n", c_size, capacity, blocks);
loopsva 0:1ed24aaf786d 475 #endif
loopsva 0:1ed24aaf786d 476 break;
loopsva 0:1ed24aaf786d 477
loopsva 0:1ed24aaf786d 478 case 1:
loopsva 0:1ed24aaf786d 479 cdv = 1;
loopsva 0:1ed24aaf786d 480 hc_c_size = ext_bits(csd, 63, 48);
loopsva 0:1ed24aaf786d 481 int hc_read_bl_len = ext_bits(csd, 83, 80);
loopsva 0:1ed24aaf786d 482 hc_capacity = hc_c_size+1;
loopsva 0:1ed24aaf786d 483 blocks = (hc_c_size+1)*1024;
loopsva 0:1ed24aaf786d 484 #ifdef DEBUG
loopsva 0:1ed24aaf786d 485 printf("SDHC Card \n\rhc_c_size: %.4X \n\rcapacity: %.lld \n\rsectors: %d\n", hc_c_size, hc_capacity*512*1024, blocks);
loopsva 0:1ed24aaf786d 486 #endif
loopsva 0:1ed24aaf786d 487 break;
loopsva 0:1ed24aaf786d 488
loopsva 0:1ed24aaf786d 489 default:
loopsva 0:1ed24aaf786d 490 fprintf(stderr, "This disk tastes funny! I only know about type 0 CSD structures\n");
loopsva 0:1ed24aaf786d 491 return 0;
loopsva 0:1ed24aaf786d 492 break;
loopsva 0:1ed24aaf786d 493 };
loopsva 0:1ed24aaf786d 494 return blocks;
loopsva 0:1ed24aaf786d 495 }