Hirofumi Inomata / Mbed 2 deprecated GR-PEACH_NTSC_in_2ch_MOD_try

MY TRAIAL (1)

Dependencies:   FATFileSystem GR-PEACH_video GraphicsFramework LCD_shield_config R_BSP mbed-rtos mbed

Fork of GR-PEACH_NTSC_in_2ch_MOD_try by Hirofumi Inomata

I put an OVERVIEW in the blow URL. https://developer.mbed.org/users/digiponta/notebook/my-trial-ar--vr-2-eyes-display-goes-by-a-gr-peach/

SD/SDFileSystem.cpp@8:0f9a45e34220, 2016-09-15 (annotated)

Committer:
digiponta
Date:
Thu Sep 15 11:06:34 2016 +0000
Revision:
8:0f9a45e34220
Parent:
6:3cb7758c3f17 
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Who changed what in which revision?

UserRevisionLine numberNew contents of line
digiponta 6:3cb7758c3f17 1 /* mbed Microcontroller Library
digiponta 6:3cb7758c3f17 2 * Copyright (c) 2006-2012 ARM Limited
digiponta 6:3cb7758c3f17 3 *
digiponta 6:3cb7758c3f17 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
digiponta 6:3cb7758c3f17 5 * of this software and associated documentation files (the "Software"), to deal
digiponta 6:3cb7758c3f17 6 * in the Software without restriction, including without limitation the rights
digiponta 6:3cb7758c3f17 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
digiponta 6:3cb7758c3f17 8 * copies of the Software, and to permit persons to whom the Software is
digiponta 6:3cb7758c3f17 9 * furnished to do so, subject to the following conditions:
digiponta 6:3cb7758c3f17 10 *
digiponta 6:3cb7758c3f17 11 * The above copyright notice and this permission notice shall be included in
digiponta 6:3cb7758c3f17 12 * all copies or substantial portions of the Software.
digiponta 6:3cb7758c3f17 13 *
digiponta 6:3cb7758c3f17 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
digiponta 6:3cb7758c3f17 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
digiponta 6:3cb7758c3f17 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
digiponta 6:3cb7758c3f17 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
digiponta 6:3cb7758c3f17 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
digiponta 6:3cb7758c3f17 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
digiponta 6:3cb7758c3f17 20 * SOFTWARE.
digiponta 6:3cb7758c3f17 21 */
digiponta 6:3cb7758c3f17 22 /* Introduction
digiponta 6:3cb7758c3f17 23 * ------------
digiponta 6:3cb7758c3f17 24 * SD and MMC cards support a number of interfaces, but common to them all
digiponta 6:3cb7758c3f17 25 * is one based on SPI. This is the one I'm implmenting because it means
digiponta 6:3cb7758c3f17 26 * it is much more portable even though not so performant, and we already
digiponta 6:3cb7758c3f17 27 * have the mbed SPI Interface!
digiponta 6:3cb7758c3f17 28 *
digiponta 6:3cb7758c3f17 29 * The main reference I'm using is Chapter 7, "SPI Mode" of:
digiponta 6:3cb7758c3f17 30 * http://www.sdcard.org/developers/tech/sdcard/pls/Simplified_Physical_Layer_Spec.pdf
digiponta 6:3cb7758c3f17 31 *
digiponta 6:3cb7758c3f17 32 * SPI Startup
digiponta 6:3cb7758c3f17 33 * -----------
digiponta 6:3cb7758c3f17 34 * The SD card powers up in SD mode. The SPI interface mode is selected by
digiponta 6:3cb7758c3f17 35 * asserting CS low and sending the reset command (CMD0). The card will
digiponta 6:3cb7758c3f17 36 * respond with a (R1) response.
digiponta 6:3cb7758c3f17 37 *
digiponta 6:3cb7758c3f17 38 * CMD8 is optionally sent to determine the voltage range supported, and
digiponta 6:3cb7758c3f17 39 * indirectly determine whether it is a version 1.x SD/non-SD card or
digiponta 6:3cb7758c3f17 40 * version 2.x. I'll just ignore this for now.
digiponta 6:3cb7758c3f17 41 *
digiponta 6:3cb7758c3f17 42 * ACMD41 is repeatedly issued to initialise the card, until "in idle"
digiponta 6:3cb7758c3f17 43 * (bit 0) of the R1 response goes to '0', indicating it is initialised.
digiponta 6:3cb7758c3f17 44 *
digiponta 6:3cb7758c3f17 45 * You should also indicate whether the host supports High Capicity cards,
digiponta 6:3cb7758c3f17 46 * and check whether the card is high capacity - i'll also ignore this
digiponta 6:3cb7758c3f17 47 *
digiponta 6:3cb7758c3f17 48 * SPI Protocol
digiponta 6:3cb7758c3f17 49 * ------------
digiponta 6:3cb7758c3f17 50 * The SD SPI protocol is based on transactions made up of 8-bit words, with
digiponta 6:3cb7758c3f17 51 * the host starting every bus transaction by asserting the CS signal low. The
digiponta 6:3cb7758c3f17 52 * card always responds to commands, data blocks and errors.
digiponta 6:3cb7758c3f17 53 *
digiponta 6:3cb7758c3f17 54 * The protocol supports a CRC, but by default it is off (except for the
digiponta 6:3cb7758c3f17 55 * first reset CMD0, where the CRC can just be pre-calculated, and CMD8)
digiponta 6:3cb7758c3f17 56 * I'll leave the CRC off I think!
digiponta 6:3cb7758c3f17 57 *
digiponta 6:3cb7758c3f17 58 * Standard capacity cards have variable data block sizes, whereas High
digiponta 6:3cb7758c3f17 59 * Capacity cards fix the size of data block to 512 bytes. I'll therefore
digiponta 6:3cb7758c3f17 60 * just always use the Standard Capacity cards with a block size of 512 bytes.
digiponta 6:3cb7758c3f17 61 * This is set with CMD16.
digiponta 6:3cb7758c3f17 62 *
digiponta 6:3cb7758c3f17 63 * You can read and write single blocks (CMD17, CMD25) or multiple blocks
digiponta 6:3cb7758c3f17 64 * (CMD18, CMD25). For simplicity, I'll just use single block accesses. When
digiponta 6:3cb7758c3f17 65 * the card gets a read command, it responds with a response token, and then
digiponta 6:3cb7758c3f17 66 * a data token or an error.
digiponta 6:3cb7758c3f17 67 *
digiponta 6:3cb7758c3f17 68 * SPI Command Format
digiponta 6:3cb7758c3f17 69 * ------------------
digiponta 6:3cb7758c3f17 70 * Commands are 6-bytes long, containing the command, 32-bit argument, and CRC.
digiponta 6:3cb7758c3f17 71 *
digiponta 6:3cb7758c3f17 72 * +---------------+------------+------------+-----------+----------+--------------+
digiponta 6:3cb7758c3f17 73 * | 01 | cmd[5:0] | arg[31:24] | arg[23:16] | arg[15:8] | arg[7:0] | crc[6:0] | 1 |
digiponta 6:3cb7758c3f17 74 * +---------------+------------+------------+-----------+----------+--------------+
digiponta 6:3cb7758c3f17 75 *
digiponta 6:3cb7758c3f17 76 * As I'm not using CRC, I can fix that byte to what is needed for CMD0 (0x95)
digiponta 6:3cb7758c3f17 77 *
digiponta 6:3cb7758c3f17 78 * All Application Specific commands shall be preceded with APP_CMD (CMD55).
digiponta 6:3cb7758c3f17 79 *
digiponta 6:3cb7758c3f17 80 * SPI Response Format
digiponta 6:3cb7758c3f17 81 * -------------------
digiponta 6:3cb7758c3f17 82 * The main response format (R1) is a status byte (normally zero). Key flags:
digiponta 6:3cb7758c3f17 83 * idle - 1 if the card is in an idle state/initialising
digiponta 6:3cb7758c3f17 84 * cmd - 1 if an illegal command code was detected
digiponta 6:3cb7758c3f17 85 *
digiponta 6:3cb7758c3f17 86 * +-------------------------------------------------+
digiponta 6:3cb7758c3f17 87 * R1 | 0 | arg | addr | seq | crc | cmd | erase | idle |
digiponta 6:3cb7758c3f17 88 * +-------------------------------------------------+
digiponta 6:3cb7758c3f17 89 *
digiponta 6:3cb7758c3f17 90 * R1b is the same, except it is followed by a busy signal (zeros) until
digiponta 6:3cb7758c3f17 91 * the first non-zero byte when it is ready again.
digiponta 6:3cb7758c3f17 92 *
digiponta 6:3cb7758c3f17 93 * Data Response Token
digiponta 6:3cb7758c3f17 94 * -------------------
digiponta 6:3cb7758c3f17 95 * Every data block written to the card is acknowledged by a byte
digiponta 6:3cb7758c3f17 96 * response token
digiponta 6:3cb7758c3f17 97 *
digiponta 6:3cb7758c3f17 98 * +----------------------+
digiponta 6:3cb7758c3f17 99 * | xxx | 0 | status | 1 |
digiponta 6:3cb7758c3f17 100 * +----------------------+
digiponta 6:3cb7758c3f17 101 * 010 - OK!
digiponta 6:3cb7758c3f17 102 * 101 - CRC Error
digiponta 6:3cb7758c3f17 103 * 110 - Write Error
digiponta 6:3cb7758c3f17 104 *
digiponta 6:3cb7758c3f17 105 * Single Block Read and Write
digiponta 6:3cb7758c3f17 106 * ---------------------------
digiponta 6:3cb7758c3f17 107 *
digiponta 6:3cb7758c3f17 108 * Block transfers have a byte header, followed by the data, followed
digiponta 6:3cb7758c3f17 109 * by a 16-bit CRC. In our case, the data will always be 512 bytes.
digiponta 6:3cb7758c3f17 110 *
digiponta 6:3cb7758c3f17 111 * +------+---------+---------+- - - -+---------+-----------+----------+
digiponta 6:3cb7758c3f17 112 * | 0xFE | data[0] | data[1] | | data[n] | crc[15:8] | crc[7:0] |
digiponta 6:3cb7758c3f17 113 * +------+---------+---------+- - - -+---------+-----------+----------+
digiponta 6:3cb7758c3f17 114 */
digiponta 6:3cb7758c3f17 115 #include "SDFileSystem.h"
digiponta 6:3cb7758c3f17 116 #include "mbed_debug.h"
digiponta 6:3cb7758c3f17 117
digiponta 6:3cb7758c3f17 118 #define SD_COMMAND_TIMEOUT 5000
digiponta 6:3cb7758c3f17 119
digiponta 6:3cb7758c3f17 120 #define SD_DBG 0
digiponta 6:3cb7758c3f17 121
digiponta 6:3cb7758c3f17 122 SDFileSystem::SDFileSystem(PinName mosi, PinName miso, PinName sclk, PinName cs, const char* name) :
digiponta 6:3cb7758c3f17 123 FATFileSystem(name), _spi(mosi, miso, sclk), _cs(cs), _is_initialized(0) {
digiponta 6:3cb7758c3f17 124 _cs = 1;
digiponta 6:3cb7758c3f17 125
digiponta 6:3cb7758c3f17 126 // Set default to 100kHz for initialisation and 1MHz for data transfer
digiponta 6:3cb7758c3f17 127 _init_sck = 100000;
digiponta 6:3cb7758c3f17 128 _transfer_sck = 1000000;
digiponta 6:3cb7758c3f17 129 }
digiponta 6:3cb7758c3f17 130
digiponta 6:3cb7758c3f17 131 #define R1_IDLE_STATE (1 << 0)
digiponta 6:3cb7758c3f17 132 #define R1_ERASE_RESET (1 << 1)
digiponta 6:3cb7758c3f17 133 #define R1_ILLEGAL_COMMAND (1 << 2)
digiponta 6:3cb7758c3f17 134 #define R1_COM_CRC_ERROR (1 << 3)
digiponta 6:3cb7758c3f17 135 #define R1_ERASE_SEQUENCE_ERROR (1 << 4)
digiponta 6:3cb7758c3f17 136 #define R1_ADDRESS_ERROR (1 << 5)
digiponta 6:3cb7758c3f17 137 #define R1_PARAMETER_ERROR (1 << 6)
digiponta 6:3cb7758c3f17 138
digiponta 6:3cb7758c3f17 139 // Types
digiponta 6:3cb7758c3f17 140 // - v1.x Standard Capacity
digiponta 6:3cb7758c3f17 141 // - v2.x Standard Capacity
digiponta 6:3cb7758c3f17 142 // - v2.x High Capacity
digiponta 6:3cb7758c3f17 143 // - Not recognised as an SD Card
digiponta 6:3cb7758c3f17 144 #define SDCARD_FAIL 0
digiponta 6:3cb7758c3f17 145 #define SDCARD_V1 1
digiponta 6:3cb7758c3f17 146 #define SDCARD_V2 2
digiponta 6:3cb7758c3f17 147 #define SDCARD_V2HC 3
digiponta 6:3cb7758c3f17 148
digiponta 6:3cb7758c3f17 149 int SDFileSystem::initialise_card() {
digiponta 6:3cb7758c3f17 150 // Set to SCK for initialisation, and clock card with cs = 1
digiponta 6:3cb7758c3f17 151 _spi.frequency(_init_sck);
digiponta 6:3cb7758c3f17 152 _cs = 1;
digiponta 6:3cb7758c3f17 153 for (int i = 0; i < 16; i++) {
digiponta 6:3cb7758c3f17 154 _spi.write(0xFF);
digiponta 6:3cb7758c3f17 155 }
digiponta 6:3cb7758c3f17 156
digiponta 6:3cb7758c3f17 157 // send CMD0, should return with all zeros except IDLE STATE set (bit 0)
digiponta 6:3cb7758c3f17 158 if (_cmd(0, 0) != R1_IDLE_STATE) {
digiponta 6:3cb7758c3f17 159 debug("No disk, or could not put SD card in to SPI idle state\n");
digiponta 6:3cb7758c3f17 160 return SDCARD_FAIL;
digiponta 6:3cb7758c3f17 161 }
digiponta 6:3cb7758c3f17 162
digiponta 6:3cb7758c3f17 163 // send CMD8 to determine whther it is ver 2.x
digiponta 6:3cb7758c3f17 164 int r = _cmd8();
digiponta 6:3cb7758c3f17 165 if (r == R1_IDLE_STATE) {
digiponta 6:3cb7758c3f17 166 return initialise_card_v2();
digiponta 6:3cb7758c3f17 167 } else if (r == (R1_IDLE_STATE | R1_ILLEGAL_COMMAND)) {
digiponta 6:3cb7758c3f17 168 return initialise_card_v1();
digiponta 6:3cb7758c3f17 169 } else {
digiponta 6:3cb7758c3f17 170 debug("Not in idle state after sending CMD8 (not an SD card?)\n");
digiponta 6:3cb7758c3f17 171 return SDCARD_FAIL;
digiponta 6:3cb7758c3f17 172 }
digiponta 6:3cb7758c3f17 173 }
digiponta 6:3cb7758c3f17 174
digiponta 6:3cb7758c3f17 175 int SDFileSystem::initialise_card_v1() {
digiponta 6:3cb7758c3f17 176 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
digiponta 6:3cb7758c3f17 177 _cmd(55, 0);
digiponta 6:3cb7758c3f17 178 if (_cmd(41, 0) == 0) {
digiponta 6:3cb7758c3f17 179 cdv = 512;
digiponta 6:3cb7758c3f17 180 debug_if(SD_DBG, "\n\rInit: SEDCARD_V1\n\r");
digiponta 6:3cb7758c3f17 181 return SDCARD_V1;
digiponta 6:3cb7758c3f17 182 }
digiponta 6:3cb7758c3f17 183 }
digiponta 6:3cb7758c3f17 184
digiponta 6:3cb7758c3f17 185 debug("Timeout waiting for v1.x card\n");
digiponta 6:3cb7758c3f17 186 return SDCARD_FAIL;
digiponta 6:3cb7758c3f17 187 }
digiponta 6:3cb7758c3f17 188
digiponta 6:3cb7758c3f17 189 int SDFileSystem::initialise_card_v2() {
digiponta 6:3cb7758c3f17 190 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
digiponta 6:3cb7758c3f17 191 wait_ms(50);
digiponta 6:3cb7758c3f17 192 _cmd58();
digiponta 6:3cb7758c3f17 193 _cmd(55, 0);
digiponta 6:3cb7758c3f17 194 if (_cmd(41, 0x40000000) == 0) {
digiponta 6:3cb7758c3f17 195 _cmd58();
digiponta 6:3cb7758c3f17 196 debug_if(SD_DBG, "\n\rInit: SDCARD_V2\n\r");
digiponta 6:3cb7758c3f17 197 cdv = 1;
digiponta 6:3cb7758c3f17 198 return SDCARD_V2;
digiponta 6:3cb7758c3f17 199 }
digiponta 6:3cb7758c3f17 200 }
digiponta 6:3cb7758c3f17 201
digiponta 6:3cb7758c3f17 202 debug("Timeout waiting for v2.x card\n");
digiponta 6:3cb7758c3f17 203 return SDCARD_FAIL;
digiponta 6:3cb7758c3f17 204 }
digiponta 6:3cb7758c3f17 205
digiponta 6:3cb7758c3f17 206 int SDFileSystem::disk_initialize() {
digiponta 6:3cb7758c3f17 207 _is_initialized = initialise_card();
digiponta 6:3cb7758c3f17 208 if (_is_initialized == 0) {
digiponta 6:3cb7758c3f17 209 debug("Fail to initialize card\n");
digiponta 6:3cb7758c3f17 210 return 1;
digiponta 6:3cb7758c3f17 211 }
digiponta 6:3cb7758c3f17 212 debug_if(SD_DBG, "init card = %d\n", _is_initialized);
digiponta 6:3cb7758c3f17 213 _sectors = _sd_sectors();
digiponta 6:3cb7758c3f17 214
digiponta 6:3cb7758c3f17 215 // Set block length to 512 (CMD16)
digiponta 6:3cb7758c3f17 216 if (_cmd(16, 512) != 0) {
digiponta 6:3cb7758c3f17 217 debug("Set 512-byte block timed out\n");
digiponta 6:3cb7758c3f17 218 return 1;
digiponta 6:3cb7758c3f17 219 }
digiponta 6:3cb7758c3f17 220
digiponta 6:3cb7758c3f17 221 // Set SCK for data transfer
digiponta 6:3cb7758c3f17 222 _spi.frequency(_transfer_sck);
digiponta 6:3cb7758c3f17 223 return 0;
digiponta 6:3cb7758c3f17 224 }
digiponta 6:3cb7758c3f17 225
digiponta 6:3cb7758c3f17 226 int SDFileSystem::disk_write(const uint8_t* buffer, uint32_t block_number, uint32_t count) {
digiponta 6:3cb7758c3f17 227 if (!_is_initialized) {
digiponta 6:3cb7758c3f17 228 return -1;
digiponta 6:3cb7758c3f17 229 }
digiponta 6:3cb7758c3f17 230
digiponta 6:3cb7758c3f17 231 for (uint32_t b = block_number; b < block_number + count; b++) {
digiponta 6:3cb7758c3f17 232 // set write address for single block (CMD24)
digiponta 6:3cb7758c3f17 233 if (_cmd(24, b * cdv) != 0) {
digiponta 6:3cb7758c3f17 234 return 1;
digiponta 6:3cb7758c3f17 235 }
digiponta 6:3cb7758c3f17 236
digiponta 6:3cb7758c3f17 237 // send the data block
digiponta 6:3cb7758c3f17 238 _write(buffer, 512);
digiponta 6:3cb7758c3f17 239 buffer += 512;
digiponta 6:3cb7758c3f17 240 }
digiponta 6:3cb7758c3f17 241
digiponta 6:3cb7758c3f17 242 return 0;
digiponta 6:3cb7758c3f17 243 }
digiponta 6:3cb7758c3f17 244
digiponta 6:3cb7758c3f17 245 int SDFileSystem::disk_read(uint8_t* buffer, uint32_t block_number, uint32_t count) {
digiponta 6:3cb7758c3f17 246 if (!_is_initialized) {
digiponta 6:3cb7758c3f17 247 return -1;
digiponta 6:3cb7758c3f17 248 }
digiponta 6:3cb7758c3f17 249
digiponta 6:3cb7758c3f17 250 for (uint32_t b = block_number; b < block_number + count; b++) {
digiponta 6:3cb7758c3f17 251 // set read address for single block (CMD17)
digiponta 6:3cb7758c3f17 252 if (_cmd(17, b * cdv) != 0) {
digiponta 6:3cb7758c3f17 253 return 1;
digiponta 6:3cb7758c3f17 254 }
digiponta 6:3cb7758c3f17 255
digiponta 6:3cb7758c3f17 256 // receive the data
digiponta 6:3cb7758c3f17 257 _read(buffer, 512);
digiponta 6:3cb7758c3f17 258 buffer += 512;
digiponta 6:3cb7758c3f17 259 }
digiponta 6:3cb7758c3f17 260
digiponta 6:3cb7758c3f17 261 return 0;
digiponta 6:3cb7758c3f17 262 }
digiponta 6:3cb7758c3f17 263
digiponta 6:3cb7758c3f17 264 int SDFileSystem::disk_status() {
digiponta 6:3cb7758c3f17 265 // FATFileSystem::disk_status() returns 0 when initialized
digiponta 6:3cb7758c3f17 266 if (_is_initialized) {
digiponta 6:3cb7758c3f17 267 return 0;
digiponta 6:3cb7758c3f17 268 } else {
digiponta 6:3cb7758c3f17 269 return 1;
digiponta 6:3cb7758c3f17 270 }
digiponta 6:3cb7758c3f17 271 }
digiponta 6:3cb7758c3f17 272
digiponta 6:3cb7758c3f17 273 int SDFileSystem::disk_sync() { return 0; }
digiponta 6:3cb7758c3f17 274 uint32_t SDFileSystem::disk_sectors() { return _sectors; }
digiponta 6:3cb7758c3f17 275
digiponta 6:3cb7758c3f17 276
digiponta 6:3cb7758c3f17 277 // PRIVATE FUNCTIONS
digiponta 6:3cb7758c3f17 278 int SDFileSystem::_cmd(int cmd, int arg) {
digiponta 6:3cb7758c3f17 279 _cs = 0;
digiponta 6:3cb7758c3f17 280
digiponta 6:3cb7758c3f17 281 // send a command
digiponta 6:3cb7758c3f17 282 _spi.write(0x40 | cmd);
digiponta 6:3cb7758c3f17 283 _spi.write(arg >> 24);
digiponta 6:3cb7758c3f17 284 _spi.write(arg >> 16);
digiponta 6:3cb7758c3f17 285 _spi.write(arg >> 8);
digiponta 6:3cb7758c3f17 286 _spi.write(arg >> 0);
digiponta 6:3cb7758c3f17 287 _spi.write(0x95);
digiponta 6:3cb7758c3f17 288
digiponta 6:3cb7758c3f17 289 // wait for the repsonse (response[7] == 0)
digiponta 6:3cb7758c3f17 290 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
digiponta 6:3cb7758c3f17 291 int response = _spi.write(0xFF);
digiponta 6:3cb7758c3f17 292 if (!(response & 0x80)) {
digiponta 6:3cb7758c3f17 293 _cs = 1;
digiponta 6:3cb7758c3f17 294 _spi.write(0xFF);
digiponta 6:3cb7758c3f17 295 return response;
digiponta 6:3cb7758c3f17 296 }
digiponta 6:3cb7758c3f17 297 }
digiponta 6:3cb7758c3f17 298 _cs = 1;
digiponta 6:3cb7758c3f17 299 _spi.write(0xFF);
digiponta 6:3cb7758c3f17 300 return -1; // timeout
digiponta 6:3cb7758c3f17 301 }
digiponta 6:3cb7758c3f17 302 int SDFileSystem::_cmdx(int cmd, int arg) {
digiponta 6:3cb7758c3f17 303 _cs = 0;
digiponta 6:3cb7758c3f17 304
digiponta 6:3cb7758c3f17 305 // send a command
digiponta 6:3cb7758c3f17 306 _spi.write(0x40 | cmd);
digiponta 6:3cb7758c3f17 307 _spi.write(arg >> 24);
digiponta 6:3cb7758c3f17 308 _spi.write(arg >> 16);
digiponta 6:3cb7758c3f17 309 _spi.write(arg >> 8);
digiponta 6:3cb7758c3f17 310 _spi.write(arg >> 0);
digiponta 6:3cb7758c3f17 311 _spi.write(0x95);
digiponta 6:3cb7758c3f17 312
digiponta 6:3cb7758c3f17 313 // wait for the repsonse (response[7] == 0)
digiponta 6:3cb7758c3f17 314 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
digiponta 6:3cb7758c3f17 315 int response = _spi.write(0xFF);
digiponta 6:3cb7758c3f17 316 if (!(response & 0x80)) {
digiponta 6:3cb7758c3f17 317 return response;
digiponta 6:3cb7758c3f17 318 }
digiponta 6:3cb7758c3f17 319 }
digiponta 6:3cb7758c3f17 320 _cs = 1;
digiponta 6:3cb7758c3f17 321 _spi.write(0xFF);
digiponta 6:3cb7758c3f17 322 return -1; // timeout
digiponta 6:3cb7758c3f17 323 }
digiponta 6:3cb7758c3f17 324
digiponta 6:3cb7758c3f17 325
digiponta 6:3cb7758c3f17 326 int SDFileSystem::_cmd58() {
digiponta 6:3cb7758c3f17 327 _cs = 0;
digiponta 6:3cb7758c3f17 328 int arg = 0;
digiponta 6:3cb7758c3f17 329
digiponta 6:3cb7758c3f17 330 // send a command
digiponta 6:3cb7758c3f17 331 _spi.write(0x40 | 58);
digiponta 6:3cb7758c3f17 332 _spi.write(arg >> 24);
digiponta 6:3cb7758c3f17 333 _spi.write(arg >> 16);
digiponta 6:3cb7758c3f17 334 _spi.write(arg >> 8);
digiponta 6:3cb7758c3f17 335 _spi.write(arg >> 0);
digiponta 6:3cb7758c3f17 336 _spi.write(0x95);
digiponta 6:3cb7758c3f17 337
digiponta 6:3cb7758c3f17 338 // wait for the repsonse (response[7] == 0)
digiponta 6:3cb7758c3f17 339 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
digiponta 6:3cb7758c3f17 340 int response = _spi.write(0xFF);
digiponta 6:3cb7758c3f17 341 if (!(response & 0x80)) {
digiponta 6:3cb7758c3f17 342 int ocr = _spi.write(0xFF) << 24;
digiponta 6:3cb7758c3f17 343 ocr |= _spi.write(0xFF) << 16;
digiponta 6:3cb7758c3f17 344 ocr |= _spi.write(0xFF) << 8;
digiponta 6:3cb7758c3f17 345 ocr |= _spi.write(0xFF) << 0;
digiponta 6:3cb7758c3f17 346 _cs = 1;
digiponta 6:3cb7758c3f17 347 _spi.write(0xFF);
digiponta 6:3cb7758c3f17 348 return response;
digiponta 6:3cb7758c3f17 349 }
digiponta 6:3cb7758c3f17 350 }
digiponta 6:3cb7758c3f17 351 _cs = 1;
digiponta 6:3cb7758c3f17 352 _spi.write(0xFF);
digiponta 6:3cb7758c3f17 353 return -1; // timeout
digiponta 6:3cb7758c3f17 354 }
digiponta 6:3cb7758c3f17 355
digiponta 6:3cb7758c3f17 356 int SDFileSystem::_cmd8() {
digiponta 6:3cb7758c3f17 357 _cs = 0;
digiponta 6:3cb7758c3f17 358
digiponta 6:3cb7758c3f17 359 // send a command
digiponta 6:3cb7758c3f17 360 _spi.write(0x40 | 8); // CMD8
digiponta 6:3cb7758c3f17 361 _spi.write(0x00); // reserved
digiponta 6:3cb7758c3f17 362 _spi.write(0x00); // reserved
digiponta 6:3cb7758c3f17 363 _spi.write(0x01); // 3.3v
digiponta 6:3cb7758c3f17 364 _spi.write(0xAA); // check pattern
digiponta 6:3cb7758c3f17 365 _spi.write(0x87); // crc
digiponta 6:3cb7758c3f17 366
digiponta 6:3cb7758c3f17 367 // wait for the repsonse (response[7] == 0)
digiponta 6:3cb7758c3f17 368 for (int i = 0; i < SD_COMMAND_TIMEOUT * 1000; i++) {
digiponta 6:3cb7758c3f17 369 char response[5];
digiponta 6:3cb7758c3f17 370 response[0] = _spi.write(0xFF);
digiponta 6:3cb7758c3f17 371 if (!(response[0] & 0x80)) {
digiponta 6:3cb7758c3f17 372 for (int j = 1; j < 5; j++) {
digiponta 6:3cb7758c3f17 373 response[i] = _spi.write(0xFF);
digiponta 6:3cb7758c3f17 374 }
digiponta 6:3cb7758c3f17 375 _cs = 1;
digiponta 6:3cb7758c3f17 376 _spi.write(0xFF);
digiponta 6:3cb7758c3f17 377 return response[0];
digiponta 6:3cb7758c3f17 378 }
digiponta 6:3cb7758c3f17 379 }
digiponta 6:3cb7758c3f17 380 _cs = 1;
digiponta 6:3cb7758c3f17 381 _spi.write(0xFF);
digiponta 6:3cb7758c3f17 382 return -1; // timeout
digiponta 6:3cb7758c3f17 383 }
digiponta 6:3cb7758c3f17 384
digiponta 6:3cb7758c3f17 385 int SDFileSystem::_read(uint8_t *buffer, uint32_t length) {
digiponta 6:3cb7758c3f17 386 _cs = 0;
digiponta 6:3cb7758c3f17 387
digiponta 6:3cb7758c3f17 388 // read until start byte (0xFF)
digiponta 6:3cb7758c3f17 389 while (_spi.write(0xFF) != 0xFE);
digiponta 6:3cb7758c3f17 390
digiponta 6:3cb7758c3f17 391 // read data
digiponta 6:3cb7758c3f17 392 for (uint32_t i = 0; i < length; i++) {
digiponta 6:3cb7758c3f17 393 buffer[i] = _spi.write(0xFF);
digiponta 6:3cb7758c3f17 394 }
digiponta 6:3cb7758c3f17 395 _spi.write(0xFF); // checksum
digiponta 6:3cb7758c3f17 396 _spi.write(0xFF);
digiponta 6:3cb7758c3f17 397
digiponta 6:3cb7758c3f17 398 _cs = 1;
digiponta 6:3cb7758c3f17 399 _spi.write(0xFF);
digiponta 6:3cb7758c3f17 400 return 0;
digiponta 6:3cb7758c3f17 401 }
digiponta 6:3cb7758c3f17 402
digiponta 6:3cb7758c3f17 403 int SDFileSystem::_write(const uint8_t*buffer, uint32_t length) {
digiponta 6:3cb7758c3f17 404 _cs = 0;
digiponta 6:3cb7758c3f17 405
digiponta 6:3cb7758c3f17 406 // indicate start of block
digiponta 6:3cb7758c3f17 407 _spi.write(0xFE);
digiponta 6:3cb7758c3f17 408
digiponta 6:3cb7758c3f17 409 // write the data
digiponta 6:3cb7758c3f17 410 for (uint32_t i = 0; i < length; i++) {
digiponta 6:3cb7758c3f17 411 _spi.write(buffer[i]);
digiponta 6:3cb7758c3f17 412 }
digiponta 6:3cb7758c3f17 413
digiponta 6:3cb7758c3f17 414 // write the checksum
digiponta 6:3cb7758c3f17 415 _spi.write(0xFF);
digiponta 6:3cb7758c3f17 416 _spi.write(0xFF);
digiponta 6:3cb7758c3f17 417
digiponta 6:3cb7758c3f17 418 // check the response token
digiponta 6:3cb7758c3f17 419 if ((_spi.write(0xFF) & 0x1F) != 0x05) {
digiponta 6:3cb7758c3f17 420 _cs = 1;
digiponta 6:3cb7758c3f17 421 _spi.write(0xFF);
digiponta 6:3cb7758c3f17 422 return 1;
digiponta 6:3cb7758c3f17 423 }
digiponta 6:3cb7758c3f17 424
digiponta 6:3cb7758c3f17 425 // wait for write to finish
digiponta 6:3cb7758c3f17 426 while (_spi.write(0xFF) == 0);
digiponta 6:3cb7758c3f17 427
digiponta 6:3cb7758c3f17 428 _cs = 1;
digiponta 6:3cb7758c3f17 429 _spi.write(0xFF);
digiponta 6:3cb7758c3f17 430 return 0;
digiponta 6:3cb7758c3f17 431 }
digiponta 6:3cb7758c3f17 432
digiponta 6:3cb7758c3f17 433 static uint32_t ext_bits(unsigned char *data, int msb, int lsb) {
digiponta 6:3cb7758c3f17 434 uint32_t bits = 0;
digiponta 6:3cb7758c3f17 435 uint32_t size = 1 + msb - lsb;
digiponta 6:3cb7758c3f17 436 for (uint32_t i = 0; i < size; i++) {
digiponta 6:3cb7758c3f17 437 uint32_t position = lsb + i;
digiponta 6:3cb7758c3f17 438 uint32_t byte = 15 - (position >> 3);
digiponta 6:3cb7758c3f17 439 uint32_t bit = position & 0x7;
digiponta 6:3cb7758c3f17 440 uint32_t value = (data[byte] >> bit) & 1;
digiponta 6:3cb7758c3f17 441 bits |= value << i;
digiponta 6:3cb7758c3f17 442 }
digiponta 6:3cb7758c3f17 443 return bits;
digiponta 6:3cb7758c3f17 444 }
digiponta 6:3cb7758c3f17 445
digiponta 6:3cb7758c3f17 446 uint32_t SDFileSystem::_sd_sectors() {
digiponta 6:3cb7758c3f17 447 uint32_t c_size, c_size_mult, read_bl_len;
digiponta 6:3cb7758c3f17 448 uint32_t block_len, mult, blocknr, capacity;
digiponta 6:3cb7758c3f17 449 uint32_t hc_c_size;
digiponta 6:3cb7758c3f17 450 uint32_t blocks;
digiponta 6:3cb7758c3f17 451
digiponta 6:3cb7758c3f17 452 // CMD9, Response R2 (R1 byte + 16-byte block read)
digiponta 6:3cb7758c3f17 453 if (_cmdx(9, 0) != 0) {
digiponta 6:3cb7758c3f17 454 debug("Didn't get a response from the disk\n");
digiponta 6:3cb7758c3f17 455 return 0;
digiponta 6:3cb7758c3f17 456 }
digiponta 6:3cb7758c3f17 457
digiponta 6:3cb7758c3f17 458 uint8_t csd[16];
digiponta 6:3cb7758c3f17 459 if (_read(csd, 16) != 0) {
digiponta 6:3cb7758c3f17 460 debug("Couldn't read csd response from disk\n");
digiponta 6:3cb7758c3f17 461 return 0;
digiponta 6:3cb7758c3f17 462 }
digiponta 6:3cb7758c3f17 463
digiponta 6:3cb7758c3f17 464 // csd_structure : csd[127:126]
digiponta 6:3cb7758c3f17 465 // c_size : csd[73:62]
digiponta 6:3cb7758c3f17 466 // c_size_mult : csd[49:47]
digiponta 6:3cb7758c3f17 467 // read_bl_len : csd[83:80] - the *maximum* read block length
digiponta 6:3cb7758c3f17 468
digiponta 6:3cb7758c3f17 469 int csd_structure = ext_bits(csd, 127, 126);
digiponta 6:3cb7758c3f17 470
digiponta 6:3cb7758c3f17 471 switch (csd_structure) {
digiponta 6:3cb7758c3f17 472 case 0:
digiponta 6:3cb7758c3f17 473 cdv = 512;
digiponta 6:3cb7758c3f17 474 c_size = ext_bits(csd, 73, 62);
digiponta 6:3cb7758c3f17 475 c_size_mult = ext_bits(csd, 49, 47);
digiponta 6:3cb7758c3f17 476 read_bl_len = ext_bits(csd, 83, 80);
digiponta 6:3cb7758c3f17 477
digiponta 6:3cb7758c3f17 478 block_len = 1 << read_bl_len;
digiponta 6:3cb7758c3f17 479 mult = 1 << (c_size_mult + 2);
digiponta 6:3cb7758c3f17 480 blocknr = (c_size + 1) * mult;
digiponta 6:3cb7758c3f17 481 capacity = blocknr * block_len;
digiponta 6:3cb7758c3f17 482 blocks = capacity / 512;
digiponta 6:3cb7758c3f17 483 debug_if(SD_DBG, "\n\rSDCard\n\rc_size: %d \n\rcapacity: %ld \n\rsectors: %lld\n\r", c_size, capacity, blocks);
digiponta 6:3cb7758c3f17 484 break;
digiponta 6:3cb7758c3f17 485
digiponta 6:3cb7758c3f17 486 case 1:
digiponta 6:3cb7758c3f17 487 cdv = 1;
digiponta 6:3cb7758c3f17 488 hc_c_size = ext_bits(csd, 63, 48);
digiponta 6:3cb7758c3f17 489 blocks = (hc_c_size+1)*1024;
digiponta 6:3cb7758c3f17 490 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);
digiponta 6:3cb7758c3f17 491 break;
digiponta 6:3cb7758c3f17 492
digiponta 6:3cb7758c3f17 493 default:
digiponta 6:3cb7758c3f17 494 debug("CSD struct unsupported\r\n");
digiponta 6:3cb7758c3f17 495 return 0;
digiponta 6:3cb7758c3f17 496 };
digiponta 6:3cb7758c3f17 497 return blocks;
digiponta 6:3cb7758c3f17 498 }