version with faster SPI clock for audio playback
Dependents: LED_effects_w_sound_SD RushHourGame electric_piano
Fork of SDFileSystem by
SDFileSystem.cpp@3:7b35d1709458, 2014-03-17 (annotated)
- Committer:
- screamer
- Date:
- Mon Mar 17 14:34:01 2014 +0000
- Revision:
- 3:7b35d1709458
- Parent:
- 2:c8f66dc765d4
- Child:
- 4:3f40cbfe801c
Added library documentation and updated FATFileSystem sub-library to the latest revision
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
emilmont | 1:7153ee70df01 | 1 | /* mbed Microcontroller Library |
emilmont | 1:7153ee70df01 | 2 | * Copyright (c) 2006-2012 ARM Limited |
emilmont | 1:7153ee70df01 | 3 | * |
emilmont | 1:7153ee70df01 | 4 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
emilmont | 1:7153ee70df01 | 5 | * of this software and associated documentation files (the "Software"), to deal |
emilmont | 1:7153ee70df01 | 6 | * in the Software without restriction, including without limitation the rights |
emilmont | 1:7153ee70df01 | 7 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
emilmont | 1:7153ee70df01 | 8 | * copies of the Software, and to permit persons to whom the Software is |
emilmont | 1:7153ee70df01 | 9 | * furnished to do so, subject to the following conditions: |
emilmont | 1:7153ee70df01 | 10 | * |
emilmont | 1:7153ee70df01 | 11 | * The above copyright notice and this permission notice shall be included in |
emilmont | 1:7153ee70df01 | 12 | * all copies or substantial portions of the Software. |
emilmont | 1:7153ee70df01 | 13 | * |
emilmont | 1:7153ee70df01 | 14 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
emilmont | 1:7153ee70df01 | 15 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
emilmont | 1:7153ee70df01 | 16 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
emilmont | 1:7153ee70df01 | 17 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
emilmont | 1:7153ee70df01 | 18 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
emilmont | 1:7153ee70df01 | 19 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
emilmont | 1:7153ee70df01 | 20 | * SOFTWARE. |
emilmont | 1:7153ee70df01 | 21 | */ |
screamer | 3:7b35d1709458 | 22 | |
emilmont | 1:7153ee70df01 | 23 | /* Introduction |
emilmont | 1:7153ee70df01 | 24 | * ------------ |
emilmont | 1:7153ee70df01 | 25 | * SD and MMC cards support a number of interfaces, but common to them all |
emilmont | 1:7153ee70df01 | 26 | * is one based on SPI. This is the one I'm implmenting because it means |
emilmont | 1:7153ee70df01 | 27 | * it is much more portable even though not so performant, and we already |
emilmont | 1:7153ee70df01 | 28 | * have the mbed SPI Interface! |
emilmont | 1:7153ee70df01 | 29 | * |
emilmont | 1:7153ee70df01 | 30 | * The main reference I'm using is Chapter 7, "SPI Mode" of: |
emilmont | 1:7153ee70df01 | 31 | * http://www.sdcard.org/developers/tech/sdcard/pls/Simplified_Physical_Layer_Spec.pdf |
emilmont | 1:7153ee70df01 | 32 | * |
emilmont | 1:7153ee70df01 | 33 | * SPI Startup |
emilmont | 1:7153ee70df01 | 34 | * ----------- |
emilmont | 1:7153ee70df01 | 35 | * The SD card powers up in SD mode. The SPI interface mode is selected by |
emilmont | 1:7153ee70df01 | 36 | * asserting CS low and sending the reset command (CMD0). The card will |
emilmont | 1:7153ee70df01 | 37 | * respond with a (R1) response. |
emilmont | 1:7153ee70df01 | 38 | * |
emilmont | 1:7153ee70df01 | 39 | * CMD8 is optionally sent to determine the voltage range supported, and |
emilmont | 1:7153ee70df01 | 40 | * indirectly determine whether it is a version 1.x SD/non-SD card or |
emilmont | 1:7153ee70df01 | 41 | * version 2.x. I'll just ignore this for now. |
emilmont | 1:7153ee70df01 | 42 | * |
emilmont | 1:7153ee70df01 | 43 | * ACMD41 is repeatedly issued to initialise the card, until "in idle" |
emilmont | 1:7153ee70df01 | 44 | * (bit 0) of the R1 response goes to '0', indicating it is initialised. |
emilmont | 1:7153ee70df01 | 45 | * |
emilmont | 1:7153ee70df01 | 46 | * You should also indicate whether the host supports High Capicity cards, |
emilmont | 1:7153ee70df01 | 47 | * and check whether the card is high capacity - i'll also ignore this |
emilmont | 1:7153ee70df01 | 48 | * |
emilmont | 1:7153ee70df01 | 49 | * SPI Protocol |
emilmont | 1:7153ee70df01 | 50 | * ------------ |
emilmont | 1:7153ee70df01 | 51 | * The SD SPI protocol is based on transactions made up of 8-bit words, with |
emilmont | 1:7153ee70df01 | 52 | * the host starting every bus transaction by asserting the CS signal low. The |
emilmont | 1:7153ee70df01 | 53 | * card always responds to commands, data blocks and errors. |
emilmont | 1:7153ee70df01 | 54 | * |
emilmont | 1:7153ee70df01 | 55 | * The protocol supports a CRC, but by default it is off (except for the |
emilmont | 1:7153ee70df01 | 56 | * first reset CMD0, where the CRC can just be pre-calculated, and CMD8) |
emilmont | 1:7153ee70df01 | 57 | * I'll leave the CRC off I think! |
emilmont | 1:7153ee70df01 | 58 | * |
emilmont | 1:7153ee70df01 | 59 | * Standard capacity cards have variable data block sizes, whereas High |
emilmont | 1:7153ee70df01 | 60 | * Capacity cards fix the size of data block to 512 bytes. I'll therefore |
emilmont | 1:7153ee70df01 | 61 | * just always use the Standard Capacity cards with a block size of 512 bytes. |
emilmont | 1:7153ee70df01 | 62 | * This is set with CMD16. |
emilmont | 1:7153ee70df01 | 63 | * |
emilmont | 1:7153ee70df01 | 64 | * You can read and write single blocks (CMD17, CMD25) or multiple blocks |
emilmont | 1:7153ee70df01 | 65 | * (CMD18, CMD25). For simplicity, I'll just use single block accesses. When |
emilmont | 1:7153ee70df01 | 66 | * the card gets a read command, it responds with a response token, and then |
emilmont | 1:7153ee70df01 | 67 | * a data token or an error. |
emilmont | 1:7153ee70df01 | 68 | * |
emilmont | 1:7153ee70df01 | 69 | * SPI Command Format |
emilmont | 1:7153ee70df01 | 70 | * ------------------ |
emilmont | 1:7153ee70df01 | 71 | * Commands are 6-bytes long, containing the command, 32-bit argument, and CRC. |
emilmont | 1:7153ee70df01 | 72 | * |
emilmont | 1:7153ee70df01 | 73 | * +---------------+------------+------------+-----------+----------+--------------+ |
emilmont | 1:7153ee70df01 | 74 | * | 01 | cmd[5:0] | arg[31:24] | arg[23:16] | arg[15:8] | arg[7:0] | crc[6:0] | 1 | |
emilmont | 1:7153ee70df01 | 75 | * +---------------+------------+------------+-----------+----------+--------------+ |
emilmont | 1:7153ee70df01 | 76 | * |
emilmont | 1:7153ee70df01 | 77 | * As I'm not using CRC, I can fix that byte to what is needed for CMD0 (0x95) |
emilmont | 1:7153ee70df01 | 78 | * |
emilmont | 1:7153ee70df01 | 79 | * All Application Specific commands shall be preceded with APP_CMD (CMD55). |
emilmont | 1:7153ee70df01 | 80 | * |
emilmont | 1:7153ee70df01 | 81 | * SPI Response Format |
emilmont | 1:7153ee70df01 | 82 | * ------------------- |
emilmont | 1:7153ee70df01 | 83 | * The main response format (R1) is a status byte (normally zero). Key flags: |
emilmont | 1:7153ee70df01 | 84 | * idle - 1 if the card is in an idle state/initialising |
emilmont | 1:7153ee70df01 | 85 | * cmd - 1 if an illegal command code was detected |
emilmont | 1:7153ee70df01 | 86 | * |
emilmont | 1:7153ee70df01 | 87 | * +-------------------------------------------------+ |
emilmont | 1:7153ee70df01 | 88 | * R1 | 0 | arg | addr | seq | crc | cmd | erase | idle | |
emilmont | 1:7153ee70df01 | 89 | * +-------------------------------------------------+ |
emilmont | 1:7153ee70df01 | 90 | * |
emilmont | 1:7153ee70df01 | 91 | * R1b is the same, except it is followed by a busy signal (zeros) until |
emilmont | 1:7153ee70df01 | 92 | * the first non-zero byte when it is ready again. |
emilmont | 1:7153ee70df01 | 93 | * |
emilmont | 1:7153ee70df01 | 94 | * Data Response Token |
emilmont | 1:7153ee70df01 | 95 | * ------------------- |
emilmont | 1:7153ee70df01 | 96 | * Every data block written to the card is acknowledged by a byte |
emilmont | 1:7153ee70df01 | 97 | * response token |
emilmont | 1:7153ee70df01 | 98 | * |
emilmont | 1:7153ee70df01 | 99 | * +----------------------+ |
emilmont | 1:7153ee70df01 | 100 | * | xxx | 0 | status | 1 | |
emilmont | 1:7153ee70df01 | 101 | * +----------------------+ |
emilmont | 1:7153ee70df01 | 102 | * 010 - OK! |
emilmont | 1:7153ee70df01 | 103 | * 101 - CRC Error |
emilmont | 1:7153ee70df01 | 104 | * 110 - Write Error |
emilmont | 1:7153ee70df01 | 105 | * |
emilmont | 1:7153ee70df01 | 106 | * Single Block Read and Write |
emilmont | 1:7153ee70df01 | 107 | * --------------------------- |
emilmont | 1:7153ee70df01 | 108 | * |
emilmont | 1:7153ee70df01 | 109 | * Block transfers have a byte header, followed by the data, followed |
emilmont | 1:7153ee70df01 | 110 | * by a 16-bit CRC. In our case, the data will always be 512 bytes. |
emilmont | 1:7153ee70df01 | 111 | * |
emilmont | 1:7153ee70df01 | 112 | * +------+---------+---------+- - - -+---------+-----------+----------+ |
emilmont | 1:7153ee70df01 | 113 | * | 0xFE | data[0] | data[1] | | data[n] | crc[15:8] | crc[7:0] | |
emilmont | 1:7153ee70df01 | 114 | * +------+---------+---------+- - - -+---------+-----------+----------+ |
emilmont | 1:7153ee70df01 | 115 | */ |
emilmont | 1:7153ee70df01 | 116 | #include "SDFileSystem.h" |
emilmont | 2:c8f66dc765d4 | 117 | #include "mbed_debug.h" |
emilmont | 1:7153ee70df01 | 118 | |
emilmont | 1:7153ee70df01 | 119 | #define SD_COMMAND_TIMEOUT 5000 |
emilmont | 1:7153ee70df01 | 120 | |
emilmont | 1:7153ee70df01 | 121 | #define SD_DBG 0 |
emilmont | 1:7153ee70df01 | 122 | |
emilmont | 1:7153ee70df01 | 123 | SDFileSystem::SDFileSystem(PinName mosi, PinName miso, PinName sclk, PinName cs, const char* name) : |
emilmont | 1:7153ee70df01 | 124 | FATFileSystem(name), _spi(mosi, miso, sclk), _cs(cs) { |
emilmont | 1:7153ee70df01 | 125 | _cs = 1; |
emilmont | 1:7153ee70df01 | 126 | } |
emilmont | 1:7153ee70df01 | 127 | |
emilmont | 1:7153ee70df01 | 128 | #define R1_IDLE_STATE (1 << 0) |
emilmont | 1:7153ee70df01 | 129 | #define R1_ERASE_RESET (1 << 1) |
emilmont | 1:7153ee70df01 | 130 | #define R1_ILLEGAL_COMMAND (1 << 2) |
emilmont | 1:7153ee70df01 | 131 | #define R1_COM_CRC_ERROR (1 << 3) |
emilmont | 1:7153ee70df01 | 132 | #define R1_ERASE_SEQUENCE_ERROR (1 << 4) |
emilmont | 1:7153ee70df01 | 133 | #define R1_ADDRESS_ERROR (1 << 5) |
emilmont | 1:7153ee70df01 | 134 | #define R1_PARAMETER_ERROR (1 << 6) |
emilmont | 1:7153ee70df01 | 135 | |
emilmont | 1:7153ee70df01 | 136 | // Types |
screamer | 3:7b35d1709458 | 137 | #define SDCARD_FAIL 0 //!< v1.x Standard Capacity |
screamer | 3:7b35d1709458 | 138 | #define SDCARD_V1 1 //!< v2.x Standard Capacity |
screamer | 3:7b35d1709458 | 139 | #define SDCARD_V2 2 //!< v2.x High Capacity |
screamer | 3:7b35d1709458 | 140 | #define SDCARD_V2HC 3 //!< Not recognised as an SD Card |
emilmont | 1:7153ee70df01 | 141 | |
emilmont | 1:7153ee70df01 | 142 | int SDFileSystem::initialise_card() { |
emilmont | 1:7153ee70df01 | 143 | // Set to 100kHz for initialisation, and clock card with cs = 1 |
emilmont | 1:7153ee70df01 | 144 | _spi.frequency(100000); |
emilmont | 1:7153ee70df01 | 145 | _cs = 1; |
emilmont | 1:7153ee70df01 | 146 | for (int i = 0; i < 16; i++) { |
emilmont | 1:7153ee70df01 | 147 | _spi.write(0xFF); |
emilmont | 1:7153ee70df01 | 148 | } |
emilmont | 1:7153ee70df01 | 149 | |
emilmont | 1:7153ee70df01 | 150 | // send CMD0, should return with all zeros except IDLE STATE set (bit 0) |
emilmont | 1:7153ee70df01 | 151 | if (_cmd(0, 0) != R1_IDLE_STATE) { |
emilmont | 1:7153ee70df01 | 152 | debug("No disk, or could not put SD card in to SPI idle state\n"); |
emilmont | 1:7153ee70df01 | 153 | return SDCARD_FAIL; |
emilmont | 1:7153ee70df01 | 154 | } |
emilmont | 1:7153ee70df01 | 155 | |
emilmont | 1:7153ee70df01 | 156 | // send CMD8 to determine whther it is ver 2.x |
emilmont | 1:7153ee70df01 | 157 | int r = _cmd8(); |
emilmont | 1:7153ee70df01 | 158 | if (r == R1_IDLE_STATE) { |
emilmont | 1:7153ee70df01 | 159 | return initialise_card_v2(); |
emilmont | 1:7153ee70df01 | 160 | } else if (r == (R1_IDLE_STATE | R1_ILLEGAL_COMMAND)) { |
emilmont | 1:7153ee70df01 | 161 | return initialise_card_v1(); |
emilmont | 1:7153ee70df01 | 162 | } else { |
emilmont | 1:7153ee70df01 | 163 | debug("Not in idle state after sending CMD8 (not an SD card?)\n"); |
emilmont | 1:7153ee70df01 | 164 | return SDCARD_FAIL; |
emilmont | 1:7153ee70df01 | 165 | } |
emilmont | 1:7153ee70df01 | 166 | } |
emilmont | 1:7153ee70df01 | 167 | |
emilmont | 1:7153ee70df01 | 168 | int SDFileSystem::initialise_card_v1() { |
emilmont | 1:7153ee70df01 | 169 | for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) { |
emilmont | 1:7153ee70df01 | 170 | _cmd(55, 0); |
emilmont | 1:7153ee70df01 | 171 | if (_cmd(41, 0) == 0) { |
emilmont | 1:7153ee70df01 | 172 | cdv = 512; |
emilmont | 1:7153ee70df01 | 173 | debug_if(SD_DBG, "\n\rInit: SEDCARD_V1\n\r"); |
emilmont | 1:7153ee70df01 | 174 | return SDCARD_V1; |
emilmont | 1:7153ee70df01 | 175 | } |
emilmont | 1:7153ee70df01 | 176 | } |
emilmont | 1:7153ee70df01 | 177 | |
emilmont | 1:7153ee70df01 | 178 | debug("Timeout waiting for v1.x card\n"); |
emilmont | 1:7153ee70df01 | 179 | return SDCARD_FAIL; |
emilmont | 1:7153ee70df01 | 180 | } |
emilmont | 1:7153ee70df01 | 181 | |
emilmont | 1:7153ee70df01 | 182 | int SDFileSystem::initialise_card_v2() { |
emilmont | 1:7153ee70df01 | 183 | for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) { |
emilmont | 1:7153ee70df01 | 184 | wait_ms(50); |
emilmont | 1:7153ee70df01 | 185 | _cmd58(); |
emilmont | 1:7153ee70df01 | 186 | _cmd(55, 0); |
emilmont | 1:7153ee70df01 | 187 | if (_cmd(41, 0x40000000) == 0) { |
emilmont | 1:7153ee70df01 | 188 | _cmd58(); |
emilmont | 1:7153ee70df01 | 189 | debug_if(SD_DBG, "\n\rInit: SDCARD_V2\n\r"); |
emilmont | 1:7153ee70df01 | 190 | cdv = 1; |
emilmont | 1:7153ee70df01 | 191 | return SDCARD_V2; |
emilmont | 1:7153ee70df01 | 192 | } |
emilmont | 1:7153ee70df01 | 193 | } |
emilmont | 1:7153ee70df01 | 194 | |
emilmont | 1:7153ee70df01 | 195 | debug("Timeout waiting for v2.x card\n"); |
emilmont | 1:7153ee70df01 | 196 | return SDCARD_FAIL; |
emilmont | 1:7153ee70df01 | 197 | } |
emilmont | 1:7153ee70df01 | 198 | |
emilmont | 1:7153ee70df01 | 199 | int SDFileSystem::disk_initialize() { |
emilmont | 1:7153ee70df01 | 200 | int i = initialise_card(); |
emilmont | 1:7153ee70df01 | 201 | debug_if(SD_DBG, "init card = %d\n", i); |
emilmont | 1:7153ee70df01 | 202 | _sectors = _sd_sectors(); |
emilmont | 1:7153ee70df01 | 203 | |
emilmont | 1:7153ee70df01 | 204 | // Set block length to 512 (CMD16) |
emilmont | 1:7153ee70df01 | 205 | if (_cmd(16, 512) != 0) { |
emilmont | 1:7153ee70df01 | 206 | debug("Set 512-byte block timed out\n"); |
emilmont | 1:7153ee70df01 | 207 | return 1; |
emilmont | 1:7153ee70df01 | 208 | } |
emilmont | 1:7153ee70df01 | 209 | |
emilmont | 1:7153ee70df01 | 210 | _spi.frequency(1000000); // Set to 1MHz for data transfer |
emilmont | 1:7153ee70df01 | 211 | return 0; |
emilmont | 1:7153ee70df01 | 212 | } |
emilmont | 1:7153ee70df01 | 213 | |
emilmont | 1:7153ee70df01 | 214 | int SDFileSystem::disk_write(const uint8_t *buffer, uint64_t block_number) { |
emilmont | 1:7153ee70df01 | 215 | // set write address for single block (CMD24) |
emilmont | 1:7153ee70df01 | 216 | if (_cmd(24, block_number * cdv) != 0) { |
emilmont | 1:7153ee70df01 | 217 | return 1; |
emilmont | 1:7153ee70df01 | 218 | } |
emilmont | 1:7153ee70df01 | 219 | |
emilmont | 1:7153ee70df01 | 220 | // send the data block |
emilmont | 1:7153ee70df01 | 221 | _write(buffer, 512); |
emilmont | 1:7153ee70df01 | 222 | return 0; |
emilmont | 1:7153ee70df01 | 223 | } |
emilmont | 1:7153ee70df01 | 224 | |
emilmont | 1:7153ee70df01 | 225 | int SDFileSystem::disk_read(uint8_t *buffer, uint64_t block_number) { |
emilmont | 1:7153ee70df01 | 226 | // set read address for single block (CMD17) |
emilmont | 1:7153ee70df01 | 227 | if (_cmd(17, block_number * cdv) != 0) { |
emilmont | 1:7153ee70df01 | 228 | return 1; |
emilmont | 1:7153ee70df01 | 229 | } |
emilmont | 1:7153ee70df01 | 230 | |
emilmont | 1:7153ee70df01 | 231 | // receive the data |
emilmont | 1:7153ee70df01 | 232 | _read(buffer, 512); |
emilmont | 1:7153ee70df01 | 233 | return 0; |
emilmont | 1:7153ee70df01 | 234 | } |
emilmont | 1:7153ee70df01 | 235 | |
emilmont | 1:7153ee70df01 | 236 | int SDFileSystem::disk_status() { return 0; } |
emilmont | 1:7153ee70df01 | 237 | int SDFileSystem::disk_sync() { return 0; } |
emilmont | 1:7153ee70df01 | 238 | uint64_t SDFileSystem::disk_sectors() { return _sectors; } |
emilmont | 1:7153ee70df01 | 239 | |
emilmont | 1:7153ee70df01 | 240 | |
emilmont | 1:7153ee70df01 | 241 | // PRIVATE FUNCTIONS |
emilmont | 1:7153ee70df01 | 242 | int SDFileSystem::_cmd(int cmd, int arg) { |
emilmont | 1:7153ee70df01 | 243 | _cs = 0; |
emilmont | 1:7153ee70df01 | 244 | |
emilmont | 1:7153ee70df01 | 245 | // send a command |
emilmont | 1:7153ee70df01 | 246 | _spi.write(0x40 | cmd); |
emilmont | 1:7153ee70df01 | 247 | _spi.write(arg >> 24); |
emilmont | 1:7153ee70df01 | 248 | _spi.write(arg >> 16); |
emilmont | 1:7153ee70df01 | 249 | _spi.write(arg >> 8); |
emilmont | 1:7153ee70df01 | 250 | _spi.write(arg >> 0); |
emilmont | 1:7153ee70df01 | 251 | _spi.write(0x95); |
emilmont | 1:7153ee70df01 | 252 | |
emilmont | 1:7153ee70df01 | 253 | // wait for the repsonse (response[7] == 0) |
emilmont | 1:7153ee70df01 | 254 | for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) { |
emilmont | 1:7153ee70df01 | 255 | int response = _spi.write(0xFF); |
emilmont | 1:7153ee70df01 | 256 | if (!(response & 0x80)) { |
emilmont | 1:7153ee70df01 | 257 | _cs = 1; |
emilmont | 1:7153ee70df01 | 258 | _spi.write(0xFF); |
emilmont | 1:7153ee70df01 | 259 | return response; |
emilmont | 1:7153ee70df01 | 260 | } |
emilmont | 1:7153ee70df01 | 261 | } |
emilmont | 1:7153ee70df01 | 262 | _cs = 1; |
emilmont | 1:7153ee70df01 | 263 | _spi.write(0xFF); |
emilmont | 1:7153ee70df01 | 264 | return -1; // timeout |
emilmont | 1:7153ee70df01 | 265 | } |
emilmont | 1:7153ee70df01 | 266 | int SDFileSystem::_cmdx(int cmd, int arg) { |
emilmont | 1:7153ee70df01 | 267 | _cs = 0; |
emilmont | 1:7153ee70df01 | 268 | |
emilmont | 1:7153ee70df01 | 269 | // send a command |
emilmont | 1:7153ee70df01 | 270 | _spi.write(0x40 | cmd); |
emilmont | 1:7153ee70df01 | 271 | _spi.write(arg >> 24); |
emilmont | 1:7153ee70df01 | 272 | _spi.write(arg >> 16); |
emilmont | 1:7153ee70df01 | 273 | _spi.write(arg >> 8); |
emilmont | 1:7153ee70df01 | 274 | _spi.write(arg >> 0); |
emilmont | 1:7153ee70df01 | 275 | _spi.write(0x95); |
emilmont | 1:7153ee70df01 | 276 | |
emilmont | 1:7153ee70df01 | 277 | // wait for the repsonse (response[7] == 0) |
emilmont | 1:7153ee70df01 | 278 | for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) { |
emilmont | 1:7153ee70df01 | 279 | int response = _spi.write(0xFF); |
emilmont | 1:7153ee70df01 | 280 | if (!(response & 0x80)) { |
emilmont | 1:7153ee70df01 | 281 | return response; |
emilmont | 1:7153ee70df01 | 282 | } |
emilmont | 1:7153ee70df01 | 283 | } |
emilmont | 1:7153ee70df01 | 284 | _cs = 1; |
emilmont | 1:7153ee70df01 | 285 | _spi.write(0xFF); |
emilmont | 1:7153ee70df01 | 286 | return -1; // timeout |
emilmont | 1:7153ee70df01 | 287 | } |
emilmont | 1:7153ee70df01 | 288 | |
emilmont | 1:7153ee70df01 | 289 | |
emilmont | 1:7153ee70df01 | 290 | int SDFileSystem::_cmd58() { |
emilmont | 1:7153ee70df01 | 291 | _cs = 0; |
emilmont | 1:7153ee70df01 | 292 | int arg = 0; |
emilmont | 1:7153ee70df01 | 293 | |
emilmont | 1:7153ee70df01 | 294 | // send a command |
emilmont | 1:7153ee70df01 | 295 | _spi.write(0x40 | 58); |
emilmont | 1:7153ee70df01 | 296 | _spi.write(arg >> 24); |
emilmont | 1:7153ee70df01 | 297 | _spi.write(arg >> 16); |
emilmont | 1:7153ee70df01 | 298 | _spi.write(arg >> 8); |
emilmont | 1:7153ee70df01 | 299 | _spi.write(arg >> 0); |
emilmont | 1:7153ee70df01 | 300 | _spi.write(0x95); |
emilmont | 1:7153ee70df01 | 301 | |
emilmont | 1:7153ee70df01 | 302 | // wait for the repsonse (response[7] == 0) |
emilmont | 1:7153ee70df01 | 303 | for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) { |
emilmont | 1:7153ee70df01 | 304 | int response = _spi.write(0xFF); |
emilmont | 1:7153ee70df01 | 305 | if (!(response & 0x80)) { |
emilmont | 1:7153ee70df01 | 306 | int ocr = _spi.write(0xFF) << 24; |
emilmont | 1:7153ee70df01 | 307 | ocr |= _spi.write(0xFF) << 16; |
emilmont | 1:7153ee70df01 | 308 | ocr |= _spi.write(0xFF) << 8; |
emilmont | 1:7153ee70df01 | 309 | ocr |= _spi.write(0xFF) << 0; |
emilmont | 1:7153ee70df01 | 310 | _cs = 1; |
emilmont | 1:7153ee70df01 | 311 | _spi.write(0xFF); |
emilmont | 1:7153ee70df01 | 312 | return response; |
emilmont | 1:7153ee70df01 | 313 | } |
emilmont | 1:7153ee70df01 | 314 | } |
emilmont | 1:7153ee70df01 | 315 | _cs = 1; |
emilmont | 1:7153ee70df01 | 316 | _spi.write(0xFF); |
emilmont | 1:7153ee70df01 | 317 | return -1; // timeout |
emilmont | 1:7153ee70df01 | 318 | } |
emilmont | 1:7153ee70df01 | 319 | |
emilmont | 1:7153ee70df01 | 320 | int SDFileSystem::_cmd8() { |
emilmont | 1:7153ee70df01 | 321 | _cs = 0; |
emilmont | 1:7153ee70df01 | 322 | |
emilmont | 1:7153ee70df01 | 323 | // send a command |
emilmont | 1:7153ee70df01 | 324 | _spi.write(0x40 | 8); // CMD8 |
emilmont | 1:7153ee70df01 | 325 | _spi.write(0x00); // reserved |
emilmont | 1:7153ee70df01 | 326 | _spi.write(0x00); // reserved |
emilmont | 1:7153ee70df01 | 327 | _spi.write(0x01); // 3.3v |
emilmont | 1:7153ee70df01 | 328 | _spi.write(0xAA); // check pattern |
emilmont | 1:7153ee70df01 | 329 | _spi.write(0x87); // crc |
emilmont | 1:7153ee70df01 | 330 | |
emilmont | 1:7153ee70df01 | 331 | // wait for the repsonse (response[7] == 0) |
emilmont | 1:7153ee70df01 | 332 | for (int i = 0; i < SD_COMMAND_TIMEOUT * 1000; i++) { |
emilmont | 1:7153ee70df01 | 333 | char response[5]; |
emilmont | 1:7153ee70df01 | 334 | response[0] = _spi.write(0xFF); |
emilmont | 1:7153ee70df01 | 335 | if (!(response[0] & 0x80)) { |
emilmont | 1:7153ee70df01 | 336 | for (int j = 1; j < 5; j++) { |
emilmont | 1:7153ee70df01 | 337 | response[i] = _spi.write(0xFF); |
emilmont | 1:7153ee70df01 | 338 | } |
emilmont | 1:7153ee70df01 | 339 | _cs = 1; |
emilmont | 1:7153ee70df01 | 340 | _spi.write(0xFF); |
emilmont | 1:7153ee70df01 | 341 | return response[0]; |
emilmont | 1:7153ee70df01 | 342 | } |
emilmont | 1:7153ee70df01 | 343 | } |
emilmont | 1:7153ee70df01 | 344 | _cs = 1; |
emilmont | 1:7153ee70df01 | 345 | _spi.write(0xFF); |
emilmont | 1:7153ee70df01 | 346 | return -1; // timeout |
emilmont | 1:7153ee70df01 | 347 | } |
emilmont | 1:7153ee70df01 | 348 | |
emilmont | 1:7153ee70df01 | 349 | int SDFileSystem::_read(uint8_t *buffer, uint32_t length) { |
emilmont | 1:7153ee70df01 | 350 | _cs = 0; |
emilmont | 1:7153ee70df01 | 351 | |
emilmont | 1:7153ee70df01 | 352 | // read until start byte (0xFF) |
emilmont | 1:7153ee70df01 | 353 | while (_spi.write(0xFF) != 0xFE); |
emilmont | 1:7153ee70df01 | 354 | |
emilmont | 1:7153ee70df01 | 355 | // read data |
emilmont | 1:7153ee70df01 | 356 | for (int i = 0; i < length; i++) { |
emilmont | 1:7153ee70df01 | 357 | buffer[i] = _spi.write(0xFF); |
emilmont | 1:7153ee70df01 | 358 | } |
emilmont | 1:7153ee70df01 | 359 | _spi.write(0xFF); // checksum |
emilmont | 1:7153ee70df01 | 360 | _spi.write(0xFF); |
emilmont | 1:7153ee70df01 | 361 | |
emilmont | 1:7153ee70df01 | 362 | _cs = 1; |
emilmont | 1:7153ee70df01 | 363 | _spi.write(0xFF); |
emilmont | 1:7153ee70df01 | 364 | return 0; |
emilmont | 1:7153ee70df01 | 365 | } |
emilmont | 1:7153ee70df01 | 366 | |
emilmont | 1:7153ee70df01 | 367 | int SDFileSystem::_write(const uint8_t*buffer, uint32_t length) { |
emilmont | 1:7153ee70df01 | 368 | _cs = 0; |
emilmont | 1:7153ee70df01 | 369 | |
emilmont | 1:7153ee70df01 | 370 | // indicate start of block |
emilmont | 1:7153ee70df01 | 371 | _spi.write(0xFE); |
emilmont | 1:7153ee70df01 | 372 | |
emilmont | 1:7153ee70df01 | 373 | // write the data |
emilmont | 1:7153ee70df01 | 374 | for (int i = 0; i < length; i++) { |
emilmont | 1:7153ee70df01 | 375 | _spi.write(buffer[i]); |
emilmont | 1:7153ee70df01 | 376 | } |
emilmont | 1:7153ee70df01 | 377 | |
emilmont | 1:7153ee70df01 | 378 | // write the checksum |
emilmont | 1:7153ee70df01 | 379 | _spi.write(0xFF); |
emilmont | 1:7153ee70df01 | 380 | _spi.write(0xFF); |
emilmont | 1:7153ee70df01 | 381 | |
emilmont | 1:7153ee70df01 | 382 | // check the response token |
emilmont | 1:7153ee70df01 | 383 | if ((_spi.write(0xFF) & 0x1F) != 0x05) { |
emilmont | 1:7153ee70df01 | 384 | _cs = 1; |
emilmont | 1:7153ee70df01 | 385 | _spi.write(0xFF); |
emilmont | 1:7153ee70df01 | 386 | return 1; |
emilmont | 1:7153ee70df01 | 387 | } |
emilmont | 1:7153ee70df01 | 388 | |
emilmont | 1:7153ee70df01 | 389 | // wait for write to finish |
emilmont | 1:7153ee70df01 | 390 | while (_spi.write(0xFF) == 0); |
emilmont | 1:7153ee70df01 | 391 | |
emilmont | 1:7153ee70df01 | 392 | _cs = 1; |
emilmont | 1:7153ee70df01 | 393 | _spi.write(0xFF); |
emilmont | 1:7153ee70df01 | 394 | return 0; |
emilmont | 1:7153ee70df01 | 395 | } |
emilmont | 1:7153ee70df01 | 396 | |
emilmont | 1:7153ee70df01 | 397 | static uint32_t ext_bits(unsigned char *data, int msb, int lsb) { |
emilmont | 1:7153ee70df01 | 398 | uint32_t bits = 0; |
emilmont | 1:7153ee70df01 | 399 | uint32_t size = 1 + msb - lsb; |
emilmont | 1:7153ee70df01 | 400 | for (int i = 0; i < size; i++) { |
emilmont | 1:7153ee70df01 | 401 | uint32_t position = lsb + i; |
emilmont | 1:7153ee70df01 | 402 | uint32_t byte = 15 - (position >> 3); |
emilmont | 1:7153ee70df01 | 403 | uint32_t bit = position & 0x7; |
emilmont | 1:7153ee70df01 | 404 | uint32_t value = (data[byte] >> bit) & 1; |
emilmont | 1:7153ee70df01 | 405 | bits |= value << i; |
emilmont | 1:7153ee70df01 | 406 | } |
emilmont | 1:7153ee70df01 | 407 | return bits; |
emilmont | 1:7153ee70df01 | 408 | } |
emilmont | 1:7153ee70df01 | 409 | |
emilmont | 1:7153ee70df01 | 410 | uint64_t SDFileSystem::_sd_sectors() { |
emilmont | 1:7153ee70df01 | 411 | uint32_t c_size, c_size_mult, read_bl_len; |
emilmont | 1:7153ee70df01 | 412 | uint32_t block_len, mult, blocknr, capacity; |
emilmont | 1:7153ee70df01 | 413 | uint32_t hc_c_size; |
emilmont | 1:7153ee70df01 | 414 | uint64_t blocks; |
emilmont | 1:7153ee70df01 | 415 | |
emilmont | 1:7153ee70df01 | 416 | // CMD9, Response R2 (R1 byte + 16-byte block read) |
emilmont | 1:7153ee70df01 | 417 | if (_cmdx(9, 0) != 0) { |
emilmont | 1:7153ee70df01 | 418 | debug("Didn't get a response from the disk\n"); |
emilmont | 1:7153ee70df01 | 419 | return 0; |
emilmont | 1:7153ee70df01 | 420 | } |
emilmont | 1:7153ee70df01 | 421 | |
emilmont | 1:7153ee70df01 | 422 | uint8_t csd[16]; |
emilmont | 1:7153ee70df01 | 423 | if (_read(csd, 16) != 0) { |
emilmont | 1:7153ee70df01 | 424 | debug("Couldn't read csd response from disk\n"); |
emilmont | 1:7153ee70df01 | 425 | return 0; |
emilmont | 1:7153ee70df01 | 426 | } |
emilmont | 1:7153ee70df01 | 427 | |
emilmont | 1:7153ee70df01 | 428 | // csd_structure : csd[127:126] |
emilmont | 1:7153ee70df01 | 429 | // c_size : csd[73:62] |
emilmont | 1:7153ee70df01 | 430 | // c_size_mult : csd[49:47] |
emilmont | 1:7153ee70df01 | 431 | // read_bl_len : csd[83:80] - the *maximum* read block length |
emilmont | 1:7153ee70df01 | 432 | |
emilmont | 1:7153ee70df01 | 433 | int csd_structure = ext_bits(csd, 127, 126); |
emilmont | 1:7153ee70df01 | 434 | |
emilmont | 1:7153ee70df01 | 435 | switch (csd_structure) { |
emilmont | 1:7153ee70df01 | 436 | case 0: |
emilmont | 1:7153ee70df01 | 437 | cdv = 512; |
emilmont | 1:7153ee70df01 | 438 | c_size = ext_bits(csd, 73, 62); |
emilmont | 1:7153ee70df01 | 439 | c_size_mult = ext_bits(csd, 49, 47); |
emilmont | 1:7153ee70df01 | 440 | read_bl_len = ext_bits(csd, 83, 80); |
emilmont | 1:7153ee70df01 | 441 | |
emilmont | 1:7153ee70df01 | 442 | block_len = 1 << read_bl_len; |
emilmont | 1:7153ee70df01 | 443 | mult = 1 << (c_size_mult + 2); |
emilmont | 1:7153ee70df01 | 444 | blocknr = (c_size + 1) * mult; |
emilmont | 1:7153ee70df01 | 445 | capacity = blocknr * block_len; |
emilmont | 1:7153ee70df01 | 446 | blocks = capacity / 512; |
emilmont | 1:7153ee70df01 | 447 | debug_if(SD_DBG, "\n\rSDCard\n\rc_size: %d \n\rcapacity: %ld \n\rsectors: %lld\n\r", c_size, capacity, blocks); |
emilmont | 1:7153ee70df01 | 448 | break; |
emilmont | 1:7153ee70df01 | 449 | |
emilmont | 1:7153ee70df01 | 450 | case 1: |
emilmont | 1:7153ee70df01 | 451 | cdv = 1; |
emilmont | 1:7153ee70df01 | 452 | hc_c_size = ext_bits(csd, 63, 48); |
emilmont | 1:7153ee70df01 | 453 | blocks = (hc_c_size+1)*1024; |
emilmont | 1:7153ee70df01 | 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); |
emilmont | 1:7153ee70df01 | 455 | break; |
emilmont | 1:7153ee70df01 | 456 | |
emilmont | 1:7153ee70df01 | 457 | default: |
emilmont | 1:7153ee70df01 | 458 | debug("CSD struct unsupported\r\n"); |
emilmont | 1:7153ee70df01 | 459 | return 0; |
emilmont | 1:7153ee70df01 | 460 | }; |
emilmont | 1:7153ee70df01 | 461 | return blocks; |
emilmont | 1:7153ee70df01 | 462 | } |