AT&T IoT / Mbed OS ATT_AWS_IoT_demo Featured

Demo application for using the AT&T IoT Starter Kit Powered by AWS.

Dependencies:   SDFileSystem

Fork of ATT_AWS_IoT_demo by Anthony Phillips

IoT Starter Kit Powered by AWS Demo

This program demonstrates the AT&T IoT Starter Kit sending data directly into AWS IoT. It's explained and used in the Getting Started with the IoT Starter Kit Powered by AWS on starterkit.att.com.

What's required

  • AT&T IoT LTE Add-on (also known as the Cellular Shield)
  • NXP K64F - for programming
  • microSD card - used to store your AWS security credentials
  • AWS account
  • Python, locally installed

If you don't already have an IoT Starter Kit, you can purchase a kit here. The IoT Starter Kit Powered by AWS includes the LTE cellular shield, K64F, and a microSD card.

SDFileSystem/SDFileSystem.cpp@26:ad43af63b3ea, 2017-01-16 (annotated)

Committer:
rfinn
Date:
Mon Jan 16 19:00:54 2017 +0000
Revision:
26:ad43af63b3ea
Parent:
18:6370da1de572 
copying to the ATT team

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ampembeng 18:6370da1de572 1 /* mbed Microcontroller Library
ampembeng 18:6370da1de572 2 * Copyright (c) 2006-2012 ARM Limited
ampembeng 18:6370da1de572 3 *
ampembeng 18:6370da1de572 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
ampembeng 18:6370da1de572 5 * of this software and associated documentation files (the "Software"), to deal
ampembeng 18:6370da1de572 6 * in the Software without restriction, including without limitation the rights
ampembeng 18:6370da1de572 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
ampembeng 18:6370da1de572 8 * copies of the Software, and to permit persons to whom the Software is
ampembeng 18:6370da1de572 9 * furnished to do so, subject to the following conditions:
ampembeng 18:6370da1de572 10 *
ampembeng 18:6370da1de572 11 * The above copyright notice and this permission notice shall be included in
ampembeng 18:6370da1de572 12 * all copies or substantial portions of the Software.
ampembeng 18:6370da1de572 13 *
ampembeng 18:6370da1de572 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
ampembeng 18:6370da1de572 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
ampembeng 18:6370da1de572 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
ampembeng 18:6370da1de572 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
ampembeng 18:6370da1de572 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
ampembeng 18:6370da1de572 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
ampembeng 18:6370da1de572 20 * SOFTWARE.
ampembeng 18:6370da1de572 21 */
ampembeng 18:6370da1de572 22
ampembeng 18:6370da1de572 23 /* Introduction
ampembeng 18:6370da1de572 24 * ------------
ampembeng 18:6370da1de572 25 * SD and MMC cards support a number of interfaces, but common to them all
ampembeng 18:6370da1de572 26 * is one based on SPI. This is the one I'm implmenting because it means
ampembeng 18:6370da1de572 27 * it is much more portable even though not so performant, and we already
ampembeng 18:6370da1de572 28 * have the mbed SPI Interface!
ampembeng 18:6370da1de572 29 *
ampembeng 18:6370da1de572 30 * The main reference I'm using is Chapter 7, "SPI Mode" of:
ampembeng 18:6370da1de572 31 * http://www.sdcard.org/developers/tech/sdcard/pls/Simplified_Physical_Layer_Spec.pdf
ampembeng 18:6370da1de572 32 *
ampembeng 18:6370da1de572 33 * SPI Startup
ampembeng 18:6370da1de572 34 * -----------
ampembeng 18:6370da1de572 35 * The SD card powers up in SD mode. The SPI interface mode is selected by
ampembeng 18:6370da1de572 36 * asserting CS low and sending the reset command (CMD0). The card will
ampembeng 18:6370da1de572 37 * respond with a (R1) response.
ampembeng 18:6370da1de572 38 *
ampembeng 18:6370da1de572 39 * CMD8 is optionally sent to determine the voltage range supported, and
ampembeng 18:6370da1de572 40 * indirectly determine whether it is a version 1.x SD/non-SD card or
ampembeng 18:6370da1de572 41 * version 2.x. I'll just ignore this for now.
ampembeng 18:6370da1de572 42 *
ampembeng 18:6370da1de572 43 * ACMD41 is repeatedly issued to initialise the card, until "in idle"
ampembeng 18:6370da1de572 44 * (bit 0) of the R1 response goes to '0', indicating it is initialised.
ampembeng 18:6370da1de572 45 *
ampembeng 18:6370da1de572 46 * You should also indicate whether the host supports High Capicity cards,
ampembeng 18:6370da1de572 47 * and check whether the card is high capacity - i'll also ignore this
ampembeng 18:6370da1de572 48 *
ampembeng 18:6370da1de572 49 * SPI Protocol
ampembeng 18:6370da1de572 50 * ------------
ampembeng 18:6370da1de572 51 * The SD SPI protocol is based on transactions made up of 8-bit words, with
ampembeng 18:6370da1de572 52 * the host starting every bus transaction by asserting the CS signal low. The
ampembeng 18:6370da1de572 53 * card always responds to commands, data blocks and errors.
ampembeng 18:6370da1de572 54 *
ampembeng 18:6370da1de572 55 * The protocol supports a CRC, but by default it is off (except for the
ampembeng 18:6370da1de572 56 * first reset CMD0, where the CRC can just be pre-calculated, and CMD8)
ampembeng 18:6370da1de572 57 * I'll leave the CRC off I think!
ampembeng 18:6370da1de572 58 *
ampembeng 18:6370da1de572 59 * Standard capacity cards have variable data block sizes, whereas High
ampembeng 18:6370da1de572 60 * Capacity cards fix the size of data block to 512 bytes. I'll therefore
ampembeng 18:6370da1de572 61 * just always use the Standard Capacity cards with a block size of 512 bytes.
ampembeng 18:6370da1de572 62 * This is set with CMD16.
ampembeng 18:6370da1de572 63 *
ampembeng 18:6370da1de572 64 * You can read and write single blocks (CMD17, CMD25) or multiple blocks
ampembeng 18:6370da1de572 65 * (CMD18, CMD25). For simplicity, I'll just use single block accesses. When
ampembeng 18:6370da1de572 66 * the card gets a read command, it responds with a response token, and then
ampembeng 18:6370da1de572 67 * a data token or an error.
ampembeng 18:6370da1de572 68 *
ampembeng 18:6370da1de572 69 * SPI Command Format
ampembeng 18:6370da1de572 70 * ------------------
ampembeng 18:6370da1de572 71 * Commands are 6-bytes long, containing the command, 32-bit argument, and CRC.
ampembeng 18:6370da1de572 72 *
ampembeng 18:6370da1de572 73 * +---------------+------------+------------+-----------+----------+--------------+
ampembeng 18:6370da1de572 74 * | 01 | cmd[5:0] | arg[31:24] | arg[23:16] | arg[15:8] | arg[7:0] | crc[6:0] | 1 |
ampembeng 18:6370da1de572 75 * +---------------+------------+------------+-----------+----------+--------------+
ampembeng 18:6370da1de572 76 *
ampembeng 18:6370da1de572 77 * As I'm not using CRC, I can fix that byte to what is needed for CMD0 (0x95)
ampembeng 18:6370da1de572 78 *
ampembeng 18:6370da1de572 79 * All Application Specific commands shall be preceded with APP_CMD (CMD55).
ampembeng 18:6370da1de572 80 *
ampembeng 18:6370da1de572 81 * SPI Response Format
ampembeng 18:6370da1de572 82 * -------------------
ampembeng 18:6370da1de572 83 * The main response format (R1) is a status byte (normally zero). Key flags:
ampembeng 18:6370da1de572 84 * idle - 1 if the card is in an idle state/initialising
ampembeng 18:6370da1de572 85 * cmd - 1 if an illegal command code was detected
ampembeng 18:6370da1de572 86 *
ampembeng 18:6370da1de572 87 * +-------------------------------------------------+
ampembeng 18:6370da1de572 88 * R1 | 0 | arg | addr | seq | crc | cmd | erase | idle |
ampembeng 18:6370da1de572 89 * +-------------------------------------------------+
ampembeng 18:6370da1de572 90 *
ampembeng 18:6370da1de572 91 * R1b is the same, except it is followed by a busy signal (zeros) until
ampembeng 18:6370da1de572 92 * the first non-zero byte when it is ready again.
ampembeng 18:6370da1de572 93 *
ampembeng 18:6370da1de572 94 * Data Response Token
ampembeng 18:6370da1de572 95 * -------------------
ampembeng 18:6370da1de572 96 * Every data block written to the card is acknowledged by a byte
ampembeng 18:6370da1de572 97 * response token
ampembeng 18:6370da1de572 98 *
ampembeng 18:6370da1de572 99 * +----------------------+
ampembeng 18:6370da1de572 100 * | xxx | 0 | status | 1 |
ampembeng 18:6370da1de572 101 * +----------------------+
ampembeng 18:6370da1de572 102 * 010 - OK!
ampembeng 18:6370da1de572 103 * 101 - CRC Error
ampembeng 18:6370da1de572 104 * 110 - Write Error
ampembeng 18:6370da1de572 105 *
ampembeng 18:6370da1de572 106 * Single Block Read and Write
ampembeng 18:6370da1de572 107 * ---------------------------
ampembeng 18:6370da1de572 108 *
ampembeng 18:6370da1de572 109 * Block transfers have a byte header, followed by the data, followed
ampembeng 18:6370da1de572 110 * by a 16-bit CRC. In our case, the data will always be 512 bytes.
ampembeng 18:6370da1de572 111 *
ampembeng 18:6370da1de572 112 * +------+---------+---------+- - - -+---------+-----------+----------+
ampembeng 18:6370da1de572 113 * | 0xFE | data[0] | data[1] | | data[n] | crc[15:8] | crc[7:0] |
ampembeng 18:6370da1de572 114 * +------+---------+---------+- - - -+---------+-----------+----------+
ampembeng 18:6370da1de572 115 */
ampembeng 18:6370da1de572 116 #include "SDFileSystem.h"
ampembeng 18:6370da1de572 117 #include "mbed_debug.h"
ampembeng 18:6370da1de572 118
ampembeng 18:6370da1de572 119 #define SD_COMMAND_TIMEOUT 5000
ampembeng 18:6370da1de572 120
ampembeng 18:6370da1de572 121 #define SD_DBG 0
ampembeng 18:6370da1de572 122
ampembeng 18:6370da1de572 123 SDFileSystem::SDFileSystem(PinName mosi, PinName miso, PinName sclk, PinName cs, const char* name) :
ampembeng 18:6370da1de572 124 FATFileSystem(name), _spi(mosi, miso, sclk), _cs(cs) {
ampembeng 18:6370da1de572 125 _cs = 1;
ampembeng 18:6370da1de572 126 }
ampembeng 18:6370da1de572 127
ampembeng 18:6370da1de572 128 #define R1_IDLE_STATE (1 << 0)
ampembeng 18:6370da1de572 129 #define R1_ERASE_RESET (1 << 1)
ampembeng 18:6370da1de572 130 #define R1_ILLEGAL_COMMAND (1 << 2)
ampembeng 18:6370da1de572 131 #define R1_COM_CRC_ERROR (1 << 3)
ampembeng 18:6370da1de572 132 #define R1_ERASE_SEQUENCE_ERROR (1 << 4)
ampembeng 18:6370da1de572 133 #define R1_ADDRESS_ERROR (1 << 5)
ampembeng 18:6370da1de572 134 #define R1_PARAMETER_ERROR (1 << 6)
ampembeng 18:6370da1de572 135
ampembeng 18:6370da1de572 136 // Types
ampembeng 18:6370da1de572 137 #define SDCARD_FAIL 0 //!< v1.x Standard Capacity
ampembeng 18:6370da1de572 138 #define SDCARD_V1 1 //!< v2.x Standard Capacity
ampembeng 18:6370da1de572 139 #define SDCARD_V2 2 //!< v2.x High Capacity
ampembeng 18:6370da1de572 140 #define SDCARD_V2HC 3 //!< Not recognised as an SD Card
ampembeng 18:6370da1de572 141
ampembeng 18:6370da1de572 142 int SDFileSystem::initialise_card() {
ampembeng 18:6370da1de572 143 // Set to 100kHz for initialisation, and clock card with cs = 1
ampembeng 18:6370da1de572 144 _spi.frequency(100000);
ampembeng 18:6370da1de572 145 _cs = 1;
ampembeng 18:6370da1de572 146 for (int i = 0; i < 16; i++) {
ampembeng 18:6370da1de572 147 _spi.write(0xFF);
ampembeng 18:6370da1de572 148 }
ampembeng 18:6370da1de572 149
ampembeng 18:6370da1de572 150 // send CMD0, should return with all zeros except IDLE STATE set (bit 0)
ampembeng 18:6370da1de572 151 if (_cmd(0, 0) != R1_IDLE_STATE) {
ampembeng 18:6370da1de572 152 debug("No disk, or could not put SD card in to SPI idle state\n");
ampembeng 18:6370da1de572 153 return SDCARD_FAIL;
ampembeng 18:6370da1de572 154 }
ampembeng 18:6370da1de572 155
ampembeng 18:6370da1de572 156 // send CMD8 to determine whther it is ver 2.x
ampembeng 18:6370da1de572 157 int r = _cmd8();
ampembeng 18:6370da1de572 158 if (r == R1_IDLE_STATE) {
ampembeng 18:6370da1de572 159 return initialise_card_v2();
ampembeng 18:6370da1de572 160 } else if (r == (R1_IDLE_STATE | R1_ILLEGAL_COMMAND)) {
ampembeng 18:6370da1de572 161 return initialise_card_v1();
ampembeng 18:6370da1de572 162 } else {
ampembeng 18:6370da1de572 163 debug("Not in idle state after sending CMD8 (not an SD card?)\n");
ampembeng 18:6370da1de572 164 return SDCARD_FAIL;
ampembeng 18:6370da1de572 165 }
ampembeng 18:6370da1de572 166 }
ampembeng 18:6370da1de572 167
ampembeng 18:6370da1de572 168 int SDFileSystem::initialise_card_v1() {
ampembeng 18:6370da1de572 169 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
ampembeng 18:6370da1de572 170 _cmd(55, 0);
ampembeng 18:6370da1de572 171 if (_cmd(41, 0) == 0) {
ampembeng 18:6370da1de572 172 cdv = 512;
ampembeng 18:6370da1de572 173 debug_if(SD_DBG, "\n\rInit: SEDCARD_V1\n\r");
ampembeng 18:6370da1de572 174 return SDCARD_V1;
ampembeng 18:6370da1de572 175 }
ampembeng 18:6370da1de572 176 }
ampembeng 18:6370da1de572 177
ampembeng 18:6370da1de572 178 debug("Timeout waiting for v1.x card\n");
ampembeng 18:6370da1de572 179 return SDCARD_FAIL;
ampembeng 18:6370da1de572 180 }
ampembeng 18:6370da1de572 181
ampembeng 18:6370da1de572 182 int SDFileSystem::initialise_card_v2() {
ampembeng 18:6370da1de572 183 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
ampembeng 18:6370da1de572 184 wait_ms(50);
ampembeng 18:6370da1de572 185 _cmd58();
ampembeng 18:6370da1de572 186 _cmd(55, 0);
ampembeng 18:6370da1de572 187 if (_cmd(41, 0x40000000) == 0) {
ampembeng 18:6370da1de572 188 _cmd58();
ampembeng 18:6370da1de572 189 debug_if(SD_DBG, "\n\rInit: SDCARD_V2\n\r");
ampembeng 18:6370da1de572 190 cdv = 1;
ampembeng 18:6370da1de572 191 return SDCARD_V2;
ampembeng 18:6370da1de572 192 }
ampembeng 18:6370da1de572 193 }
ampembeng 18:6370da1de572 194
ampembeng 18:6370da1de572 195 debug("Timeout waiting for v2.x card\n");
ampembeng 18:6370da1de572 196 return SDCARD_FAIL;
ampembeng 18:6370da1de572 197 }
ampembeng 18:6370da1de572 198
ampembeng 18:6370da1de572 199 int SDFileSystem::disk_initialize() {
ampembeng 18:6370da1de572 200 int i = initialise_card();
ampembeng 18:6370da1de572 201 debug_if(SD_DBG, "init card = %d\n", i);
ampembeng 18:6370da1de572 202 _sectors = _sd_sectors();
ampembeng 18:6370da1de572 203
ampembeng 18:6370da1de572 204 // Set block length to 512 (CMD16)
ampembeng 18:6370da1de572 205 if (_cmd(16, 512) != 0) {
ampembeng 18:6370da1de572 206 debug("Set 512-byte block timed out\n");
ampembeng 18:6370da1de572 207 return 1;
ampembeng 18:6370da1de572 208 }
ampembeng 18:6370da1de572 209
ampembeng 18:6370da1de572 210 _spi.frequency(1000000); // Set to 1MHz for data transfer
ampembeng 18:6370da1de572 211 return 0;
ampembeng 18:6370da1de572 212 }
ampembeng 18:6370da1de572 213
ampembeng 18:6370da1de572 214 int SDFileSystem::disk_write(const uint8_t *buffer, uint64_t block_number) {
ampembeng 18:6370da1de572 215 // set write address for single block (CMD24)
ampembeng 18:6370da1de572 216 if (_cmd(24, block_number * cdv) != 0) {
ampembeng 18:6370da1de572 217 return 1;
ampembeng 18:6370da1de572 218 }
ampembeng 18:6370da1de572 219
ampembeng 18:6370da1de572 220 // send the data block
ampembeng 18:6370da1de572 221 _write(buffer, 512);
ampembeng 18:6370da1de572 222 return 0;
ampembeng 18:6370da1de572 223 }
ampembeng 18:6370da1de572 224
ampembeng 18:6370da1de572 225 int SDFileSystem::disk_read(uint8_t *buffer, uint64_t block_number) {
ampembeng 18:6370da1de572 226 // set read address for single block (CMD17)
ampembeng 18:6370da1de572 227 if (_cmd(17, block_number * cdv) != 0) {
ampembeng 18:6370da1de572 228 return 1;
ampembeng 18:6370da1de572 229 }
ampembeng 18:6370da1de572 230
ampembeng 18:6370da1de572 231 // receive the data
ampembeng 18:6370da1de572 232 _read(buffer, 512);
ampembeng 18:6370da1de572 233 return 0;
ampembeng 18:6370da1de572 234 }
ampembeng 18:6370da1de572 235
ampembeng 18:6370da1de572 236 int SDFileSystem::disk_status() { return 0; }
ampembeng 18:6370da1de572 237 int SDFileSystem::disk_sync() { return 0; }
ampembeng 18:6370da1de572 238 uint64_t SDFileSystem::disk_sectors() { return _sectors; }
ampembeng 18:6370da1de572 239
ampembeng 18:6370da1de572 240
ampembeng 18:6370da1de572 241 // PRIVATE FUNCTIONS
ampembeng 18:6370da1de572 242 int SDFileSystem::_cmd(int cmd, int arg) {
ampembeng 18:6370da1de572 243 _cs = 0;
ampembeng 18:6370da1de572 244
ampembeng 18:6370da1de572 245 // send a command
ampembeng 18:6370da1de572 246 _spi.write(0x40 | cmd);
ampembeng 18:6370da1de572 247 _spi.write(arg >> 24);
ampembeng 18:6370da1de572 248 _spi.write(arg >> 16);
ampembeng 18:6370da1de572 249 _spi.write(arg >> 8);
ampembeng 18:6370da1de572 250 _spi.write(arg >> 0);
ampembeng 18:6370da1de572 251 _spi.write(0x95);
ampembeng 18:6370da1de572 252
ampembeng 18:6370da1de572 253 // wait for the repsonse (response[7] == 0)
ampembeng 18:6370da1de572 254 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
ampembeng 18:6370da1de572 255 int response = _spi.write(0xFF);
ampembeng 18:6370da1de572 256 if (!(response & 0x80)) {
ampembeng 18:6370da1de572 257 _cs = 1;
ampembeng 18:6370da1de572 258 _spi.write(0xFF);
ampembeng 18:6370da1de572 259 return response;
ampembeng 18:6370da1de572 260 }
ampembeng 18:6370da1de572 261 }
ampembeng 18:6370da1de572 262 _cs = 1;
ampembeng 18:6370da1de572 263 _spi.write(0xFF);
ampembeng 18:6370da1de572 264 return -1; // timeout
ampembeng 18:6370da1de572 265 }
ampembeng 18:6370da1de572 266 int SDFileSystem::_cmdx(int cmd, int arg) {
ampembeng 18:6370da1de572 267 _cs = 0;
ampembeng 18:6370da1de572 268
ampembeng 18:6370da1de572 269 // send a command
ampembeng 18:6370da1de572 270 _spi.write(0x40 | cmd);
ampembeng 18:6370da1de572 271 _spi.write(arg >> 24);
ampembeng 18:6370da1de572 272 _spi.write(arg >> 16);
ampembeng 18:6370da1de572 273 _spi.write(arg >> 8);
ampembeng 18:6370da1de572 274 _spi.write(arg >> 0);
ampembeng 18:6370da1de572 275 _spi.write(0x95);
ampembeng 18:6370da1de572 276
ampembeng 18:6370da1de572 277 // wait for the repsonse (response[7] == 0)
ampembeng 18:6370da1de572 278 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
ampembeng 18:6370da1de572 279 int response = _spi.write(0xFF);
ampembeng 18:6370da1de572 280 if (!(response & 0x80)) {
ampembeng 18:6370da1de572 281 return response;
ampembeng 18:6370da1de572 282 }
ampembeng 18:6370da1de572 283 }
ampembeng 18:6370da1de572 284 _cs = 1;
ampembeng 18:6370da1de572 285 _spi.write(0xFF);
ampembeng 18:6370da1de572 286 return -1; // timeout
ampembeng 18:6370da1de572 287 }
ampembeng 18:6370da1de572 288
ampembeng 18:6370da1de572 289
ampembeng 18:6370da1de572 290 int SDFileSystem::_cmd58() {
ampembeng 18:6370da1de572 291 _cs = 0;
ampembeng 18:6370da1de572 292 int arg = 0;
ampembeng 18:6370da1de572 293
ampembeng 18:6370da1de572 294 // send a command
ampembeng 18:6370da1de572 295 _spi.write(0x40 | 58);
ampembeng 18:6370da1de572 296 _spi.write(arg >> 24);
ampembeng 18:6370da1de572 297 _spi.write(arg >> 16);
ampembeng 18:6370da1de572 298 _spi.write(arg >> 8);
ampembeng 18:6370da1de572 299 _spi.write(arg >> 0);
ampembeng 18:6370da1de572 300 _spi.write(0x95);
ampembeng 18:6370da1de572 301
ampembeng 18:6370da1de572 302 // wait for the repsonse (response[7] == 0)
ampembeng 18:6370da1de572 303 for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
ampembeng 18:6370da1de572 304 int response = _spi.write(0xFF);
ampembeng 18:6370da1de572 305 if (!(response & 0x80)) {
ampembeng 18:6370da1de572 306 int ocr = _spi.write(0xFF) << 24;
ampembeng 18:6370da1de572 307 ocr |= _spi.write(0xFF) << 16;
ampembeng 18:6370da1de572 308 ocr |= _spi.write(0xFF) << 8;
ampembeng 18:6370da1de572 309 ocr |= _spi.write(0xFF) << 0;
ampembeng 18:6370da1de572 310 _cs = 1;
ampembeng 18:6370da1de572 311 _spi.write(0xFF);
ampembeng 18:6370da1de572 312 return response;
ampembeng 18:6370da1de572 313 }
ampembeng 18:6370da1de572 314 }
ampembeng 18:6370da1de572 315 _cs = 1;
ampembeng 18:6370da1de572 316 _spi.write(0xFF);
ampembeng 18:6370da1de572 317 return -1; // timeout
ampembeng 18:6370da1de572 318 }
ampembeng 18:6370da1de572 319
ampembeng 18:6370da1de572 320 int SDFileSystem::_cmd8() {
ampembeng 18:6370da1de572 321 _cs = 0;
ampembeng 18:6370da1de572 322
ampembeng 18:6370da1de572 323 // send a command
ampembeng 18:6370da1de572 324 _spi.write(0x40 | 8); // CMD8
ampembeng 18:6370da1de572 325 _spi.write(0x00); // reserved
ampembeng 18:6370da1de572 326 _spi.write(0x00); // reserved
ampembeng 18:6370da1de572 327 _spi.write(0x01); // 3.3v
ampembeng 18:6370da1de572 328 _spi.write(0xAA); // check pattern
ampembeng 18:6370da1de572 329 _spi.write(0x87); // crc
ampembeng 18:6370da1de572 330
ampembeng 18:6370da1de572 331 // wait for the repsonse (response[7] == 0)
ampembeng 18:6370da1de572 332 for (int i = 0; i < SD_COMMAND_TIMEOUT * 1000; i++) {
ampembeng 18:6370da1de572 333 char response[5];
ampembeng 18:6370da1de572 334 response[0] = _spi.write(0xFF);
ampembeng 18:6370da1de572 335 if (!(response[0] & 0x80)) {
ampembeng 18:6370da1de572 336 for (int j = 1; j < 5; j++) {
ampembeng 18:6370da1de572 337 response[i] = _spi.write(0xFF);
ampembeng 18:6370da1de572 338 }
ampembeng 18:6370da1de572 339 _cs = 1;
ampembeng 18:6370da1de572 340 _spi.write(0xFF);
ampembeng 18:6370da1de572 341 return response[0];
ampembeng 18:6370da1de572 342 }
ampembeng 18:6370da1de572 343 }
ampembeng 18:6370da1de572 344 _cs = 1;
ampembeng 18:6370da1de572 345 _spi.write(0xFF);
ampembeng 18:6370da1de572 346 return -1; // timeout
ampembeng 18:6370da1de572 347 }
ampembeng 18:6370da1de572 348
ampembeng 18:6370da1de572 349 int SDFileSystem::_read(uint8_t *buffer, uint32_t length) {
ampembeng 18:6370da1de572 350 _cs = 0;
ampembeng 18:6370da1de572 351
ampembeng 18:6370da1de572 352 // read until start byte (0xFF)
ampembeng 18:6370da1de572 353 while (_spi.write(0xFF) != 0xFE);
ampembeng 18:6370da1de572 354
ampembeng 18:6370da1de572 355 // read data
ampembeng 18:6370da1de572 356 for (int i = 0; i < length; i++) {
ampembeng 18:6370da1de572 357 buffer[i] = _spi.write(0xFF);
ampembeng 18:6370da1de572 358 }
ampembeng 18:6370da1de572 359 _spi.write(0xFF); // checksum
ampembeng 18:6370da1de572 360 _spi.write(0xFF);
ampembeng 18:6370da1de572 361
ampembeng 18:6370da1de572 362 _cs = 1;
ampembeng 18:6370da1de572 363 _spi.write(0xFF);
ampembeng 18:6370da1de572 364 return 0;
ampembeng 18:6370da1de572 365 }
ampembeng 18:6370da1de572 366
ampembeng 18:6370da1de572 367 int SDFileSystem::_write(const uint8_t*buffer, uint32_t length) {
ampembeng 18:6370da1de572 368 _cs = 0;
ampembeng 18:6370da1de572 369
ampembeng 18:6370da1de572 370 // indicate start of block
ampembeng 18:6370da1de572 371 _spi.write(0xFE);
ampembeng 18:6370da1de572 372
ampembeng 18:6370da1de572 373 // write the data
ampembeng 18:6370da1de572 374 for (int i = 0; i < length; i++) {
ampembeng 18:6370da1de572 375 _spi.write(buffer[i]);
ampembeng 18:6370da1de572 376 }
ampembeng 18:6370da1de572 377
ampembeng 18:6370da1de572 378 // write the checksum
ampembeng 18:6370da1de572 379 _spi.write(0xFF);
ampembeng 18:6370da1de572 380 _spi.write(0xFF);
ampembeng 18:6370da1de572 381
ampembeng 18:6370da1de572 382 // check the response token
ampembeng 18:6370da1de572 383 if ((_spi.write(0xFF) & 0x1F) != 0x05) {
ampembeng 18:6370da1de572 384 _cs = 1;
ampembeng 18:6370da1de572 385 _spi.write(0xFF);
ampembeng 18:6370da1de572 386 return 1;
ampembeng 18:6370da1de572 387 }
ampembeng 18:6370da1de572 388
ampembeng 18:6370da1de572 389 // wait for write to finish
ampembeng 18:6370da1de572 390 while (_spi.write(0xFF) == 0);
ampembeng 18:6370da1de572 391
ampembeng 18:6370da1de572 392 _cs = 1;
ampembeng 18:6370da1de572 393 _spi.write(0xFF);
ampembeng 18:6370da1de572 394 return 0;
ampembeng 18:6370da1de572 395 }
ampembeng 18:6370da1de572 396
ampembeng 18:6370da1de572 397 static uint32_t ext_bits(unsigned char *data, int msb, int lsb) {
ampembeng 18:6370da1de572 398 uint32_t bits = 0;
ampembeng 18:6370da1de572 399 uint32_t size = 1 + msb - lsb;
ampembeng 18:6370da1de572 400 for (int i = 0; i < size; i++) {
ampembeng 18:6370da1de572 401 uint32_t position = lsb + i;
ampembeng 18:6370da1de572 402 uint32_t byte = 15 - (position >> 3);
ampembeng 18:6370da1de572 403 uint32_t bit = position & 0x7;
ampembeng 18:6370da1de572 404 uint32_t value = (data[byte] >> bit) & 1;
ampembeng 18:6370da1de572 405 bits |= value << i;
ampembeng 18:6370da1de572 406 }
ampembeng 18:6370da1de572 407 return bits;
ampembeng 18:6370da1de572 408 }
ampembeng 18:6370da1de572 409
ampembeng 18:6370da1de572 410 uint64_t SDFileSystem::_sd_sectors() {
ampembeng 18:6370da1de572 411 uint32_t c_size, c_size_mult, read_bl_len;
ampembeng 18:6370da1de572 412 uint32_t block_len, mult, blocknr, capacity;
ampembeng 18:6370da1de572 413 uint32_t hc_c_size;
ampembeng 18:6370da1de572 414 uint64_t blocks;
ampembeng 18:6370da1de572 415
ampembeng 18:6370da1de572 416 // CMD9, Response R2 (R1 byte + 16-byte block read)
ampembeng 18:6370da1de572 417 if (_cmdx(9, 0) != 0) {
ampembeng 18:6370da1de572 418 debug("Didn't get a response from the disk\n");
ampembeng 18:6370da1de572 419 return 0;
ampembeng 18:6370da1de572 420 }
ampembeng 18:6370da1de572 421
ampembeng 18:6370da1de572 422 uint8_t csd[16];
ampembeng 18:6370da1de572 423 if (_read(csd, 16) != 0) {
ampembeng 18:6370da1de572 424 debug("Couldn't read csd response from disk\n");
ampembeng 18:6370da1de572 425 return 0;
ampembeng 18:6370da1de572 426 }
ampembeng 18:6370da1de572 427
ampembeng 18:6370da1de572 428 // csd_structure : csd[127:126]
ampembeng 18:6370da1de572 429 // c_size : csd[73:62]
ampembeng 18:6370da1de572 430 // c_size_mult : csd[49:47]
ampembeng 18:6370da1de572 431 // read_bl_len : csd[83:80] - the *maximum* read block length
ampembeng 18:6370da1de572 432
ampembeng 18:6370da1de572 433 int csd_structure = ext_bits(csd, 127, 126);
ampembeng 18:6370da1de572 434
ampembeng 18:6370da1de572 435 switch (csd_structure) {
ampembeng 18:6370da1de572 436 case 0:
ampembeng 18:6370da1de572 437 cdv = 512;
ampembeng 18:6370da1de572 438 c_size = ext_bits(csd, 73, 62);
ampembeng 18:6370da1de572 439 c_size_mult = ext_bits(csd, 49, 47);
ampembeng 18:6370da1de572 440 read_bl_len = ext_bits(csd, 83, 80);
ampembeng 18:6370da1de572 441
ampembeng 18:6370da1de572 442 block_len = 1 << read_bl_len;
ampembeng 18:6370da1de572 443 mult = 1 << (c_size_mult + 2);
ampembeng 18:6370da1de572 444 blocknr = (c_size + 1) * mult;
ampembeng 18:6370da1de572 445 capacity = blocknr * block_len;
ampembeng 18:6370da1de572 446 blocks = capacity / 512;
ampembeng 18:6370da1de572 447 debug_if(SD_DBG, "\n\rSDCard\n\rc_size: %d \n\rcapacity: %ld \n\rsectors: %lld\n\r", c_size, capacity, blocks);
ampembeng 18:6370da1de572 448 break;
ampembeng 18:6370da1de572 449
ampembeng 18:6370da1de572 450 case 1:
ampembeng 18:6370da1de572 451 cdv = 1;
ampembeng 18:6370da1de572 452 hc_c_size = ext_bits(csd, 63, 48);
ampembeng 18:6370da1de572 453 blocks = (hc_c_size+1)*1024;
ampembeng 18:6370da1de572 454 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);
ampembeng 18:6370da1de572 455 break;
ampembeng 18:6370da1de572 456
ampembeng 18:6370da1de572 457 default:
ampembeng 18:6370da1de572 458 debug("CSD struct unsupported\r\n");
ampembeng 18:6370da1de572 459 return 0;
ampembeng 18:6370da1de572 460 };
ampembeng 18:6370da1de572 461 return blocks;
ampembeng 18:6370da1de572 462 }