Block access only to a SD Flash card conected via SPI. Based on SDFileSystem, but without any file system support.
SDFlashDisk.cpp@0:99935a94f153, 2013-06-21 (annotated)
- Committer:
- johnvanlaanen
- Date:
- Fri Jun 21 16:50:37 2013 +0000
- Revision:
- 0:99935a94f153
Create SDFlashDisk library
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
johnvanlaanen | 0:99935a94f153 | 1 | /* This is a modified version of the MBED's library file SDFileSystem.cpp |
johnvanlaanen | 0:99935a94f153 | 2 | * It supports only low-level block access to a SD flash card |
johnvanlaanen | 0:99935a94f153 | 3 | * |
johnvanlaanen | 0:99935a94f153 | 4 | * Modifications by John VanLaanen, June 2013 |
johnvanlaanen | 0:99935a94f153 | 5 | */ |
johnvanlaanen | 0:99935a94f153 | 6 | |
johnvanlaanen | 0:99935a94f153 | 7 | // Header from original file: |
johnvanlaanen | 0:99935a94f153 | 8 | |
johnvanlaanen | 0:99935a94f153 | 9 | /* |
johnvanlaanen | 0:99935a94f153 | 10 | * mbed Microcontroller Library |
johnvanlaanen | 0:99935a94f153 | 11 | * Copyright (c) 2006-2012 ARM Limited |
johnvanlaanen | 0:99935a94f153 | 12 | * |
johnvanlaanen | 0:99935a94f153 | 13 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
johnvanlaanen | 0:99935a94f153 | 14 | * of this software and associated documentation files (the "Software"), to deal |
johnvanlaanen | 0:99935a94f153 | 15 | * in the Software without restriction, including without limitation the rights |
johnvanlaanen | 0:99935a94f153 | 16 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
johnvanlaanen | 0:99935a94f153 | 17 | * copies of the Software, and to permit persons to whom the Software is |
johnvanlaanen | 0:99935a94f153 | 18 | * furnished to do so, subject to the following conditions: |
johnvanlaanen | 0:99935a94f153 | 19 | * |
johnvanlaanen | 0:99935a94f153 | 20 | * The above copyright notice and this permission notice shall be included in |
johnvanlaanen | 0:99935a94f153 | 21 | * all copies or substantial portions of the Software. |
johnvanlaanen | 0:99935a94f153 | 22 | * |
johnvanlaanen | 0:99935a94f153 | 23 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
johnvanlaanen | 0:99935a94f153 | 24 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
johnvanlaanen | 0:99935a94f153 | 25 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
johnvanlaanen | 0:99935a94f153 | 26 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
johnvanlaanen | 0:99935a94f153 | 27 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
johnvanlaanen | 0:99935a94f153 | 28 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
johnvanlaanen | 0:99935a94f153 | 29 | * SOFTWARE. |
johnvanlaanen | 0:99935a94f153 | 30 | */ |
johnvanlaanen | 0:99935a94f153 | 31 | /* Introduction |
johnvanlaanen | 0:99935a94f153 | 32 | * ------------ |
johnvanlaanen | 0:99935a94f153 | 33 | * SD and MMC cards support a number of interfaces, but common to them all |
johnvanlaanen | 0:99935a94f153 | 34 | * is one based on SPI. This is the one I'm implmenting because it means |
johnvanlaanen | 0:99935a94f153 | 35 | * it is much more portable even though not so performant, and we already |
johnvanlaanen | 0:99935a94f153 | 36 | * have the mbed SPI Interface! |
johnvanlaanen | 0:99935a94f153 | 37 | * |
johnvanlaanen | 0:99935a94f153 | 38 | * The main reference I'm using is Chapter 7, "SPI Mode" of: |
johnvanlaanen | 0:99935a94f153 | 39 | * http://www.sdcard.org/developers/tech/sdcard/pls/Simplified_Physical_Layer_Spec.pdf |
johnvanlaanen | 0:99935a94f153 | 40 | * |
johnvanlaanen | 0:99935a94f153 | 41 | * SPI Startup |
johnvanlaanen | 0:99935a94f153 | 42 | * ----------- |
johnvanlaanen | 0:99935a94f153 | 43 | * The SD card powers up in SD mode. The SPI interface mode is selected by |
johnvanlaanen | 0:99935a94f153 | 44 | * asserting CS low and sending the reset command (CMD0). The card will |
johnvanlaanen | 0:99935a94f153 | 45 | * respond with a (R1) response. |
johnvanlaanen | 0:99935a94f153 | 46 | * |
johnvanlaanen | 0:99935a94f153 | 47 | * CMD8 is optionally sent to determine the voltage range supported, and |
johnvanlaanen | 0:99935a94f153 | 48 | * indirectly determine whether it is a version 1.x SD/non-SD card or |
johnvanlaanen | 0:99935a94f153 | 49 | * version 2.x. I'll just ignore this for now. |
johnvanlaanen | 0:99935a94f153 | 50 | * |
johnvanlaanen | 0:99935a94f153 | 51 | * ACMD41 is repeatedly issued to initialise the card, until "in idle" |
johnvanlaanen | 0:99935a94f153 | 52 | * (bit 0) of the R1 response goes to '0', indicating it is initialised. |
johnvanlaanen | 0:99935a94f153 | 53 | * |
johnvanlaanen | 0:99935a94f153 | 54 | * You should also indicate whether the host supports High Capicity cards, |
johnvanlaanen | 0:99935a94f153 | 55 | * and check whether the card is high capacity - i'll also ignore this |
johnvanlaanen | 0:99935a94f153 | 56 | * |
johnvanlaanen | 0:99935a94f153 | 57 | * SPI Protocol |
johnvanlaanen | 0:99935a94f153 | 58 | * ------------ |
johnvanlaanen | 0:99935a94f153 | 59 | * The SD SPI protocol is based on transactions made up of 8-bit words, with |
johnvanlaanen | 0:99935a94f153 | 60 | * the host starting every bus transaction by asserting the CS signal low. The |
johnvanlaanen | 0:99935a94f153 | 61 | * card always responds to commands, data blocks and errors. |
johnvanlaanen | 0:99935a94f153 | 62 | * |
johnvanlaanen | 0:99935a94f153 | 63 | * The protocol supports a CRC, but by default it is off (except for the |
johnvanlaanen | 0:99935a94f153 | 64 | * first reset CMD0, where the CRC can just be pre-calculated, and CMD8) |
johnvanlaanen | 0:99935a94f153 | 65 | * I'll leave the CRC off I think! |
johnvanlaanen | 0:99935a94f153 | 66 | * |
johnvanlaanen | 0:99935a94f153 | 67 | * Standard capacity cards have variable data block sizes, whereas High |
johnvanlaanen | 0:99935a94f153 | 68 | * Capacity cards fix the size of data block to 512 bytes. I'll therefore |
johnvanlaanen | 0:99935a94f153 | 69 | * just always use the Standard Capacity cards with a block size of 512 bytes. |
johnvanlaanen | 0:99935a94f153 | 70 | * This is set with CMD16. |
johnvanlaanen | 0:99935a94f153 | 71 | * |
johnvanlaanen | 0:99935a94f153 | 72 | * You can read and write single blocks (CMD17, CMD25) or multiple blocks |
johnvanlaanen | 0:99935a94f153 | 73 | * (CMD18, CMD25). For simplicity, I'll just use single block accesses. When |
johnvanlaanen | 0:99935a94f153 | 74 | * the card gets a read command, it responds with a response token, and then |
johnvanlaanen | 0:99935a94f153 | 75 | * a data token or an error. |
johnvanlaanen | 0:99935a94f153 | 76 | * |
johnvanlaanen | 0:99935a94f153 | 77 | * SPI Command Format |
johnvanlaanen | 0:99935a94f153 | 78 | * ------------------ |
johnvanlaanen | 0:99935a94f153 | 79 | * Commands are 6-bytes long, containing the command, 32-bit argument, and CRC. |
johnvanlaanen | 0:99935a94f153 | 80 | * |
johnvanlaanen | 0:99935a94f153 | 81 | * +---------------+------------+------------+-----------+----------+--------------+ |
johnvanlaanen | 0:99935a94f153 | 82 | * | 01 | cmd[5:0] | arg[31:24] | arg[23:16] | arg[15:8] | arg[7:0] | crc[6:0] | 1 | |
johnvanlaanen | 0:99935a94f153 | 83 | * +---------------+------------+------------+-----------+----------+--------------+ |
johnvanlaanen | 0:99935a94f153 | 84 | * |
johnvanlaanen | 0:99935a94f153 | 85 | * As I'm not using CRC, I can fix that byte to what is needed for CMD0 (0x95) |
johnvanlaanen | 0:99935a94f153 | 86 | * |
johnvanlaanen | 0:99935a94f153 | 87 | * All Application Specific commands shall be preceded with APP_CMD (CMD55). |
johnvanlaanen | 0:99935a94f153 | 88 | * |
johnvanlaanen | 0:99935a94f153 | 89 | * SPI Response Format |
johnvanlaanen | 0:99935a94f153 | 90 | * ------------------- |
johnvanlaanen | 0:99935a94f153 | 91 | * The main response format (R1) is a status byte (normally zero). Key flags: |
johnvanlaanen | 0:99935a94f153 | 92 | * idle - 1 if the card is in an idle state/initialising |
johnvanlaanen | 0:99935a94f153 | 93 | * cmd - 1 if an illegal command code was detected |
johnvanlaanen | 0:99935a94f153 | 94 | * |
johnvanlaanen | 0:99935a94f153 | 95 | * +-------------------------------------------------+ |
johnvanlaanen | 0:99935a94f153 | 96 | * R1 | 0 | arg | addr | seq | crc | cmd | erase | idle | |
johnvanlaanen | 0:99935a94f153 | 97 | * +-------------------------------------------------+ |
johnvanlaanen | 0:99935a94f153 | 98 | * |
johnvanlaanen | 0:99935a94f153 | 99 | * R1b is the same, except it is followed by a busy signal (zeros) until |
johnvanlaanen | 0:99935a94f153 | 100 | * the first non-zero byte when it is ready again. |
johnvanlaanen | 0:99935a94f153 | 101 | * |
johnvanlaanen | 0:99935a94f153 | 102 | * Data Response Token |
johnvanlaanen | 0:99935a94f153 | 103 | * ------------------- |
johnvanlaanen | 0:99935a94f153 | 104 | * Every data block written to the card is acknowledged by a byte |
johnvanlaanen | 0:99935a94f153 | 105 | * response token |
johnvanlaanen | 0:99935a94f153 | 106 | * |
johnvanlaanen | 0:99935a94f153 | 107 | * +----------------------+ |
johnvanlaanen | 0:99935a94f153 | 108 | * | xxx | 0 | status | 1 | |
johnvanlaanen | 0:99935a94f153 | 109 | * +----------------------+ |
johnvanlaanen | 0:99935a94f153 | 110 | * 010 - OK! |
johnvanlaanen | 0:99935a94f153 | 111 | * 101 - CRC Error |
johnvanlaanen | 0:99935a94f153 | 112 | * 110 - Write Error |
johnvanlaanen | 0:99935a94f153 | 113 | * |
johnvanlaanen | 0:99935a94f153 | 114 | * Single Block Read and Write |
johnvanlaanen | 0:99935a94f153 | 115 | * --------------------------- |
johnvanlaanen | 0:99935a94f153 | 116 | * |
johnvanlaanen | 0:99935a94f153 | 117 | * Block transfers have a byte header, followed by the data, followed |
johnvanlaanen | 0:99935a94f153 | 118 | * by a 16-bit CRC. In our case, the data will always be 512 bytes. |
johnvanlaanen | 0:99935a94f153 | 119 | * |
johnvanlaanen | 0:99935a94f153 | 120 | * +------+---------+---------+- - - -+---------+-----------+----------+ |
johnvanlaanen | 0:99935a94f153 | 121 | * | 0xFE | data[0] | data[1] | | data[n] | crc[15:8] | crc[7:0] | |
johnvanlaanen | 0:99935a94f153 | 122 | * +------+---------+---------+- - - -+---------+-----------+----------+ |
johnvanlaanen | 0:99935a94f153 | 123 | */ |
johnvanlaanen | 0:99935a94f153 | 124 | #include "SDFlashDisk.h" |
johnvanlaanen | 0:99935a94f153 | 125 | #include "mbed_debug.h" |
johnvanlaanen | 0:99935a94f153 | 126 | |
johnvanlaanen | 0:99935a94f153 | 127 | #define SD_COMMAND_TIMEOUT 5000 |
johnvanlaanen | 0:99935a94f153 | 128 | |
johnvanlaanen | 0:99935a94f153 | 129 | #define SD_DBG 0 |
johnvanlaanen | 0:99935a94f153 | 130 | |
johnvanlaanen | 0:99935a94f153 | 131 | SDFlashDisk::SDFlashDisk(PinName mosi, PinName miso, PinName sclk, PinName cs) : |
johnvanlaanen | 0:99935a94f153 | 132 | _spi(mosi, miso, sclk), _cs(cs) { |
johnvanlaanen | 0:99935a94f153 | 133 | _cs = 1; |
johnvanlaanen | 0:99935a94f153 | 134 | } |
johnvanlaanen | 0:99935a94f153 | 135 | |
johnvanlaanen | 0:99935a94f153 | 136 | #define R1_IDLE_STATE (1 << 0) |
johnvanlaanen | 0:99935a94f153 | 137 | #define R1_ERASE_RESET (1 << 1) |
johnvanlaanen | 0:99935a94f153 | 138 | #define R1_ILLEGAL_COMMAND (1 << 2) |
johnvanlaanen | 0:99935a94f153 | 139 | #define R1_COM_CRC_ERROR (1 << 3) |
johnvanlaanen | 0:99935a94f153 | 140 | #define R1_ERASE_SEQUENCE_ERROR (1 << 4) |
johnvanlaanen | 0:99935a94f153 | 141 | #define R1_ADDRESS_ERROR (1 << 5) |
johnvanlaanen | 0:99935a94f153 | 142 | #define R1_PARAMETER_ERROR (1 << 6) |
johnvanlaanen | 0:99935a94f153 | 143 | |
johnvanlaanen | 0:99935a94f153 | 144 | // Types |
johnvanlaanen | 0:99935a94f153 | 145 | // - v1.x Standard Capacity |
johnvanlaanen | 0:99935a94f153 | 146 | // - v2.x Standard Capacity |
johnvanlaanen | 0:99935a94f153 | 147 | // - v2.x High Capacity |
johnvanlaanen | 0:99935a94f153 | 148 | // - Not recognised as an SD Card |
johnvanlaanen | 0:99935a94f153 | 149 | #define SDCARD_FAIL 0 |
johnvanlaanen | 0:99935a94f153 | 150 | #define SDCARD_V1 1 |
johnvanlaanen | 0:99935a94f153 | 151 | #define SDCARD_V2 2 |
johnvanlaanen | 0:99935a94f153 | 152 | #define SDCARD_V2HC 3 |
johnvanlaanen | 0:99935a94f153 | 153 | |
johnvanlaanen | 0:99935a94f153 | 154 | int SDFlashDisk::initialise_card() { |
johnvanlaanen | 0:99935a94f153 | 155 | // Set to 100kHz for initialisation, and clock card with cs = 1 |
johnvanlaanen | 0:99935a94f153 | 156 | _spi.frequency(100000); |
johnvanlaanen | 0:99935a94f153 | 157 | _cs = 1; |
johnvanlaanen | 0:99935a94f153 | 158 | for (int i = 0; i < 16; i++) { |
johnvanlaanen | 0:99935a94f153 | 159 | _spi.write(0xFF); |
johnvanlaanen | 0:99935a94f153 | 160 | } |
johnvanlaanen | 0:99935a94f153 | 161 | |
johnvanlaanen | 0:99935a94f153 | 162 | // send CMD0, should return with all zeros except IDLE STATE set (bit 0) |
johnvanlaanen | 0:99935a94f153 | 163 | if (_cmd(0, 0) != R1_IDLE_STATE) { |
johnvanlaanen | 0:99935a94f153 | 164 | debug("No disk, or could not put SD card in to SPI idle state\r\n"); |
johnvanlaanen | 0:99935a94f153 | 165 | return SDCARD_FAIL; |
johnvanlaanen | 0:99935a94f153 | 166 | } |
johnvanlaanen | 0:99935a94f153 | 167 | |
johnvanlaanen | 0:99935a94f153 | 168 | // send CMD8 to determine whther it is ver 2.x |
johnvanlaanen | 0:99935a94f153 | 169 | int r = _cmd8(); |
johnvanlaanen | 0:99935a94f153 | 170 | if (r == R1_IDLE_STATE) { |
johnvanlaanen | 0:99935a94f153 | 171 | return initialise_card_v2(); |
johnvanlaanen | 0:99935a94f153 | 172 | } else if (r == (R1_IDLE_STATE | R1_ILLEGAL_COMMAND)) { |
johnvanlaanen | 0:99935a94f153 | 173 | return initialise_card_v1(); |
johnvanlaanen | 0:99935a94f153 | 174 | } else { |
johnvanlaanen | 0:99935a94f153 | 175 | debug("Not in idle state after sending CMD8 (not an SD card?)\r\n"); |
johnvanlaanen | 0:99935a94f153 | 176 | return SDCARD_FAIL; |
johnvanlaanen | 0:99935a94f153 | 177 | } |
johnvanlaanen | 0:99935a94f153 | 178 | } |
johnvanlaanen | 0:99935a94f153 | 179 | |
johnvanlaanen | 0:99935a94f153 | 180 | int SDFlashDisk::initialise_card_v1() { |
johnvanlaanen | 0:99935a94f153 | 181 | for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) { |
johnvanlaanen | 0:99935a94f153 | 182 | _cmd(55, 0); |
johnvanlaanen | 0:99935a94f153 | 183 | if (_cmd(41, 0) == 0) { |
johnvanlaanen | 0:99935a94f153 | 184 | cdv = 512; |
johnvanlaanen | 0:99935a94f153 | 185 | debug_if(SD_DBG, "\n\rInit: SEDCARD_V1\n\r"); |
johnvanlaanen | 0:99935a94f153 | 186 | return SDCARD_V1; |
johnvanlaanen | 0:99935a94f153 | 187 | } |
johnvanlaanen | 0:99935a94f153 | 188 | } |
johnvanlaanen | 0:99935a94f153 | 189 | |
johnvanlaanen | 0:99935a94f153 | 190 | debug("Timeout waiting for v1.x card\r\n"); |
johnvanlaanen | 0:99935a94f153 | 191 | return SDCARD_FAIL; |
johnvanlaanen | 0:99935a94f153 | 192 | } |
johnvanlaanen | 0:99935a94f153 | 193 | |
johnvanlaanen | 0:99935a94f153 | 194 | int SDFlashDisk::initialise_card_v2() { |
johnvanlaanen | 0:99935a94f153 | 195 | for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) { |
johnvanlaanen | 0:99935a94f153 | 196 | wait_ms(50); |
johnvanlaanen | 0:99935a94f153 | 197 | _cmd58(); |
johnvanlaanen | 0:99935a94f153 | 198 | _cmd(55, 0); |
johnvanlaanen | 0:99935a94f153 | 199 | if (_cmd(41, 0x40000000) == 0) { |
johnvanlaanen | 0:99935a94f153 | 200 | _cmd58(); |
johnvanlaanen | 0:99935a94f153 | 201 | debug_if(SD_DBG, "\n\rInit: SDCARD_V2\n\r"); |
johnvanlaanen | 0:99935a94f153 | 202 | cdv = 1; |
johnvanlaanen | 0:99935a94f153 | 203 | return SDCARD_V2; |
johnvanlaanen | 0:99935a94f153 | 204 | } |
johnvanlaanen | 0:99935a94f153 | 205 | } |
johnvanlaanen | 0:99935a94f153 | 206 | |
johnvanlaanen | 0:99935a94f153 | 207 | debug("Timeout waiting for v2.x card\r\n"); |
johnvanlaanen | 0:99935a94f153 | 208 | return SDCARD_FAIL; |
johnvanlaanen | 0:99935a94f153 | 209 | } |
johnvanlaanen | 0:99935a94f153 | 210 | |
johnvanlaanen | 0:99935a94f153 | 211 | int SDFlashDisk::disk_initialize() { |
johnvanlaanen | 0:99935a94f153 | 212 | int i = initialise_card(); |
johnvanlaanen | 0:99935a94f153 | 213 | debug_if(SD_DBG, "init card = %d\r\n", i); |
johnvanlaanen | 0:99935a94f153 | 214 | _sectors = _sd_sectors(); |
johnvanlaanen | 0:99935a94f153 | 215 | |
johnvanlaanen | 0:99935a94f153 | 216 | // Set block length to 512 (CMD16) |
johnvanlaanen | 0:99935a94f153 | 217 | if (_cmd(16, 512) != 0) { |
johnvanlaanen | 0:99935a94f153 | 218 | debug("Set 512-byte block timed out\r\n"); |
johnvanlaanen | 0:99935a94f153 | 219 | return 1; |
johnvanlaanen | 0:99935a94f153 | 220 | } |
johnvanlaanen | 0:99935a94f153 | 221 | |
johnvanlaanen | 0:99935a94f153 | 222 | _spi.frequency(1000000); // Set to 1MHz for data transfer |
johnvanlaanen | 0:99935a94f153 | 223 | return 0; |
johnvanlaanen | 0:99935a94f153 | 224 | } |
johnvanlaanen | 0:99935a94f153 | 225 | |
johnvanlaanen | 0:99935a94f153 | 226 | int SDFlashDisk::disk_write(const uint8_t *buffer, uint64_t block_number) { |
johnvanlaanen | 0:99935a94f153 | 227 | // set write address for single block (CMD24) |
johnvanlaanen | 0:99935a94f153 | 228 | if (_cmd(24, block_number * cdv) != 0) { |
johnvanlaanen | 0:99935a94f153 | 229 | return 1; |
johnvanlaanen | 0:99935a94f153 | 230 | } |
johnvanlaanen | 0:99935a94f153 | 231 | |
johnvanlaanen | 0:99935a94f153 | 232 | // send the data block |
johnvanlaanen | 0:99935a94f153 | 233 | _write(buffer, 512); |
johnvanlaanen | 0:99935a94f153 | 234 | return 0; |
johnvanlaanen | 0:99935a94f153 | 235 | } |
johnvanlaanen | 0:99935a94f153 | 236 | |
johnvanlaanen | 0:99935a94f153 | 237 | int SDFlashDisk::disk_read(uint8_t *buffer, uint64_t block_number) { |
johnvanlaanen | 0:99935a94f153 | 238 | // set read address for single block (CMD17) |
johnvanlaanen | 0:99935a94f153 | 239 | if (_cmd(17, block_number * cdv) != 0) { |
johnvanlaanen | 0:99935a94f153 | 240 | return 1; |
johnvanlaanen | 0:99935a94f153 | 241 | } |
johnvanlaanen | 0:99935a94f153 | 242 | |
johnvanlaanen | 0:99935a94f153 | 243 | // receive the data |
johnvanlaanen | 0:99935a94f153 | 244 | _read(buffer, 512); |
johnvanlaanen | 0:99935a94f153 | 245 | return 0; |
johnvanlaanen | 0:99935a94f153 | 246 | } |
johnvanlaanen | 0:99935a94f153 | 247 | |
johnvanlaanen | 0:99935a94f153 | 248 | uint64_t SDFlashDisk::disk_sectors() { return _sectors; } |
johnvanlaanen | 0:99935a94f153 | 249 | |
johnvanlaanen | 0:99935a94f153 | 250 | |
johnvanlaanen | 0:99935a94f153 | 251 | // PRIVATE FUNCTIONS |
johnvanlaanen | 0:99935a94f153 | 252 | int SDFlashDisk::_cmd(int cmd, int arg) { |
johnvanlaanen | 0:99935a94f153 | 253 | _cs = 0; |
johnvanlaanen | 0:99935a94f153 | 254 | |
johnvanlaanen | 0:99935a94f153 | 255 | // send a command |
johnvanlaanen | 0:99935a94f153 | 256 | _spi.write(0x40 | cmd); |
johnvanlaanen | 0:99935a94f153 | 257 | _spi.write(arg >> 24); |
johnvanlaanen | 0:99935a94f153 | 258 | _spi.write(arg >> 16); |
johnvanlaanen | 0:99935a94f153 | 259 | _spi.write(arg >> 8); |
johnvanlaanen | 0:99935a94f153 | 260 | _spi.write(arg >> 0); |
johnvanlaanen | 0:99935a94f153 | 261 | _spi.write(0x95); |
johnvanlaanen | 0:99935a94f153 | 262 | |
johnvanlaanen | 0:99935a94f153 | 263 | // wait for the repsonse (response[7] == 0) |
johnvanlaanen | 0:99935a94f153 | 264 | for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) { |
johnvanlaanen | 0:99935a94f153 | 265 | int response = _spi.write(0xFF); |
johnvanlaanen | 0:99935a94f153 | 266 | if (!(response & 0x80)) { |
johnvanlaanen | 0:99935a94f153 | 267 | _cs = 1; |
johnvanlaanen | 0:99935a94f153 | 268 | _spi.write(0xFF); |
johnvanlaanen | 0:99935a94f153 | 269 | return response; |
johnvanlaanen | 0:99935a94f153 | 270 | } |
johnvanlaanen | 0:99935a94f153 | 271 | } |
johnvanlaanen | 0:99935a94f153 | 272 | _cs = 1; |
johnvanlaanen | 0:99935a94f153 | 273 | _spi.write(0xFF); |
johnvanlaanen | 0:99935a94f153 | 274 | return -1; // timeout |
johnvanlaanen | 0:99935a94f153 | 275 | } |
johnvanlaanen | 0:99935a94f153 | 276 | int SDFlashDisk::_cmdx(int cmd, int arg) { |
johnvanlaanen | 0:99935a94f153 | 277 | _cs = 0; |
johnvanlaanen | 0:99935a94f153 | 278 | |
johnvanlaanen | 0:99935a94f153 | 279 | // send a command |
johnvanlaanen | 0:99935a94f153 | 280 | _spi.write(0x40 | cmd); |
johnvanlaanen | 0:99935a94f153 | 281 | _spi.write(arg >> 24); |
johnvanlaanen | 0:99935a94f153 | 282 | _spi.write(arg >> 16); |
johnvanlaanen | 0:99935a94f153 | 283 | _spi.write(arg >> 8); |
johnvanlaanen | 0:99935a94f153 | 284 | _spi.write(arg >> 0); |
johnvanlaanen | 0:99935a94f153 | 285 | _spi.write(0x95); |
johnvanlaanen | 0:99935a94f153 | 286 | |
johnvanlaanen | 0:99935a94f153 | 287 | // wait for the repsonse (response[7] == 0) |
johnvanlaanen | 0:99935a94f153 | 288 | for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) { |
johnvanlaanen | 0:99935a94f153 | 289 | int response = _spi.write(0xFF); |
johnvanlaanen | 0:99935a94f153 | 290 | if (!(response & 0x80)) { |
johnvanlaanen | 0:99935a94f153 | 291 | return response; |
johnvanlaanen | 0:99935a94f153 | 292 | } |
johnvanlaanen | 0:99935a94f153 | 293 | } |
johnvanlaanen | 0:99935a94f153 | 294 | _cs = 1; |
johnvanlaanen | 0:99935a94f153 | 295 | _spi.write(0xFF); |
johnvanlaanen | 0:99935a94f153 | 296 | return -1; // timeout |
johnvanlaanen | 0:99935a94f153 | 297 | } |
johnvanlaanen | 0:99935a94f153 | 298 | |
johnvanlaanen | 0:99935a94f153 | 299 | |
johnvanlaanen | 0:99935a94f153 | 300 | int SDFlashDisk::_cmd58() { |
johnvanlaanen | 0:99935a94f153 | 301 | _cs = 0; |
johnvanlaanen | 0:99935a94f153 | 302 | int arg = 0; |
johnvanlaanen | 0:99935a94f153 | 303 | |
johnvanlaanen | 0:99935a94f153 | 304 | // send a command |
johnvanlaanen | 0:99935a94f153 | 305 | _spi.write(0x40 | 58); |
johnvanlaanen | 0:99935a94f153 | 306 | _spi.write(arg >> 24); |
johnvanlaanen | 0:99935a94f153 | 307 | _spi.write(arg >> 16); |
johnvanlaanen | 0:99935a94f153 | 308 | _spi.write(arg >> 8); |
johnvanlaanen | 0:99935a94f153 | 309 | _spi.write(arg >> 0); |
johnvanlaanen | 0:99935a94f153 | 310 | _spi.write(0x95); |
johnvanlaanen | 0:99935a94f153 | 311 | |
johnvanlaanen | 0:99935a94f153 | 312 | // wait for the repsonse (response[7] == 0) |
johnvanlaanen | 0:99935a94f153 | 313 | for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) { |
johnvanlaanen | 0:99935a94f153 | 314 | int response = _spi.write(0xFF); |
johnvanlaanen | 0:99935a94f153 | 315 | if (!(response & 0x80)) { |
johnvanlaanen | 0:99935a94f153 | 316 | int ocr = _spi.write(0xFF) << 24; |
johnvanlaanen | 0:99935a94f153 | 317 | ocr |= _spi.write(0xFF) << 16; |
johnvanlaanen | 0:99935a94f153 | 318 | ocr |= _spi.write(0xFF) << 8; |
johnvanlaanen | 0:99935a94f153 | 319 | ocr |= _spi.write(0xFF) << 0; |
johnvanlaanen | 0:99935a94f153 | 320 | _cs = 1; |
johnvanlaanen | 0:99935a94f153 | 321 | _spi.write(0xFF); |
johnvanlaanen | 0:99935a94f153 | 322 | return response; |
johnvanlaanen | 0:99935a94f153 | 323 | } |
johnvanlaanen | 0:99935a94f153 | 324 | } |
johnvanlaanen | 0:99935a94f153 | 325 | _cs = 1; |
johnvanlaanen | 0:99935a94f153 | 326 | _spi.write(0xFF); |
johnvanlaanen | 0:99935a94f153 | 327 | return -1; // timeout |
johnvanlaanen | 0:99935a94f153 | 328 | } |
johnvanlaanen | 0:99935a94f153 | 329 | |
johnvanlaanen | 0:99935a94f153 | 330 | int SDFlashDisk::_cmd8() { |
johnvanlaanen | 0:99935a94f153 | 331 | _cs = 0; |
johnvanlaanen | 0:99935a94f153 | 332 | |
johnvanlaanen | 0:99935a94f153 | 333 | // send a command |
johnvanlaanen | 0:99935a94f153 | 334 | _spi.write(0x40 | 8); // CMD8 |
johnvanlaanen | 0:99935a94f153 | 335 | _spi.write(0x00); // reserved |
johnvanlaanen | 0:99935a94f153 | 336 | _spi.write(0x00); // reserved |
johnvanlaanen | 0:99935a94f153 | 337 | _spi.write(0x01); // 3.3v |
johnvanlaanen | 0:99935a94f153 | 338 | _spi.write(0xAA); // check pattern |
johnvanlaanen | 0:99935a94f153 | 339 | _spi.write(0x87); // crc |
johnvanlaanen | 0:99935a94f153 | 340 | |
johnvanlaanen | 0:99935a94f153 | 341 | // wait for the repsonse (response[7] == 0) |
johnvanlaanen | 0:99935a94f153 | 342 | for (int i = 0; i < SD_COMMAND_TIMEOUT * 1000; i++) { |
johnvanlaanen | 0:99935a94f153 | 343 | char response[5]; |
johnvanlaanen | 0:99935a94f153 | 344 | response[0] = _spi.write(0xFF); |
johnvanlaanen | 0:99935a94f153 | 345 | if (!(response[0] & 0x80)) { |
johnvanlaanen | 0:99935a94f153 | 346 | for (int j = 1; j < 5; j++) { |
johnvanlaanen | 0:99935a94f153 | 347 | response[i] = _spi.write(0xFF); |
johnvanlaanen | 0:99935a94f153 | 348 | } |
johnvanlaanen | 0:99935a94f153 | 349 | _cs = 1; |
johnvanlaanen | 0:99935a94f153 | 350 | _spi.write(0xFF); |
johnvanlaanen | 0:99935a94f153 | 351 | return response[0]; |
johnvanlaanen | 0:99935a94f153 | 352 | } |
johnvanlaanen | 0:99935a94f153 | 353 | } |
johnvanlaanen | 0:99935a94f153 | 354 | _cs = 1; |
johnvanlaanen | 0:99935a94f153 | 355 | _spi.write(0xFF); |
johnvanlaanen | 0:99935a94f153 | 356 | return -1; // timeout |
johnvanlaanen | 0:99935a94f153 | 357 | } |
johnvanlaanen | 0:99935a94f153 | 358 | |
johnvanlaanen | 0:99935a94f153 | 359 | int SDFlashDisk::_read(uint8_t *buffer, uint32_t length) { |
johnvanlaanen | 0:99935a94f153 | 360 | _cs = 0; |
johnvanlaanen | 0:99935a94f153 | 361 | |
johnvanlaanen | 0:99935a94f153 | 362 | // read until start byte (0xFF) |
johnvanlaanen | 0:99935a94f153 | 363 | while (_spi.write(0xFF) != 0xFE); |
johnvanlaanen | 0:99935a94f153 | 364 | |
johnvanlaanen | 0:99935a94f153 | 365 | // read data |
johnvanlaanen | 0:99935a94f153 | 366 | for (int i = 0; i < length; i++) { |
johnvanlaanen | 0:99935a94f153 | 367 | buffer[i] = _spi.write(0xFF); |
johnvanlaanen | 0:99935a94f153 | 368 | } |
johnvanlaanen | 0:99935a94f153 | 369 | _spi.write(0xFF); // checksum |
johnvanlaanen | 0:99935a94f153 | 370 | _spi.write(0xFF); |
johnvanlaanen | 0:99935a94f153 | 371 | |
johnvanlaanen | 0:99935a94f153 | 372 | _cs = 1; |
johnvanlaanen | 0:99935a94f153 | 373 | _spi.write(0xFF); |
johnvanlaanen | 0:99935a94f153 | 374 | return 0; |
johnvanlaanen | 0:99935a94f153 | 375 | } |
johnvanlaanen | 0:99935a94f153 | 376 | |
johnvanlaanen | 0:99935a94f153 | 377 | int SDFlashDisk::_write(const uint8_t*buffer, uint32_t length) { |
johnvanlaanen | 0:99935a94f153 | 378 | _cs = 0; |
johnvanlaanen | 0:99935a94f153 | 379 | |
johnvanlaanen | 0:99935a94f153 | 380 | // indicate start of block |
johnvanlaanen | 0:99935a94f153 | 381 | _spi.write(0xFE); |
johnvanlaanen | 0:99935a94f153 | 382 | |
johnvanlaanen | 0:99935a94f153 | 383 | // write the data |
johnvanlaanen | 0:99935a94f153 | 384 | for (int i = 0; i < length; i++) { |
johnvanlaanen | 0:99935a94f153 | 385 | _spi.write(buffer[i]); |
johnvanlaanen | 0:99935a94f153 | 386 | } |
johnvanlaanen | 0:99935a94f153 | 387 | |
johnvanlaanen | 0:99935a94f153 | 388 | // write the checksum |
johnvanlaanen | 0:99935a94f153 | 389 | _spi.write(0xFF); |
johnvanlaanen | 0:99935a94f153 | 390 | _spi.write(0xFF); |
johnvanlaanen | 0:99935a94f153 | 391 | |
johnvanlaanen | 0:99935a94f153 | 392 | // check the response token |
johnvanlaanen | 0:99935a94f153 | 393 | if ((_spi.write(0xFF) & 0x1F) != 0x05) { |
johnvanlaanen | 0:99935a94f153 | 394 | _cs = 1; |
johnvanlaanen | 0:99935a94f153 | 395 | _spi.write(0xFF); |
johnvanlaanen | 0:99935a94f153 | 396 | return 1; |
johnvanlaanen | 0:99935a94f153 | 397 | } |
johnvanlaanen | 0:99935a94f153 | 398 | |
johnvanlaanen | 0:99935a94f153 | 399 | // wait for write to finish |
johnvanlaanen | 0:99935a94f153 | 400 | while (_spi.write(0xFF) == 0); |
johnvanlaanen | 0:99935a94f153 | 401 | |
johnvanlaanen | 0:99935a94f153 | 402 | _cs = 1; |
johnvanlaanen | 0:99935a94f153 | 403 | _spi.write(0xFF); |
johnvanlaanen | 0:99935a94f153 | 404 | return 0; |
johnvanlaanen | 0:99935a94f153 | 405 | } |
johnvanlaanen | 0:99935a94f153 | 406 | |
johnvanlaanen | 0:99935a94f153 | 407 | static uint32_t ext_bits(unsigned char *data, int msb, int lsb) { |
johnvanlaanen | 0:99935a94f153 | 408 | uint32_t bits = 0; |
johnvanlaanen | 0:99935a94f153 | 409 | uint32_t size = 1 + msb - lsb; |
johnvanlaanen | 0:99935a94f153 | 410 | for (int i = 0; i < size; i++) { |
johnvanlaanen | 0:99935a94f153 | 411 | uint32_t position = lsb + i; |
johnvanlaanen | 0:99935a94f153 | 412 | uint32_t byte = 15 - (position >> 3); |
johnvanlaanen | 0:99935a94f153 | 413 | uint32_t bit = position & 0x7; |
johnvanlaanen | 0:99935a94f153 | 414 | uint32_t value = (data[byte] >> bit) & 1; |
johnvanlaanen | 0:99935a94f153 | 415 | bits |= value << i; |
johnvanlaanen | 0:99935a94f153 | 416 | } |
johnvanlaanen | 0:99935a94f153 | 417 | return bits; |
johnvanlaanen | 0:99935a94f153 | 418 | } |
johnvanlaanen | 0:99935a94f153 | 419 | |
johnvanlaanen | 0:99935a94f153 | 420 | uint64_t SDFlashDisk::_sd_sectors() { |
johnvanlaanen | 0:99935a94f153 | 421 | uint32_t c_size, c_size_mult, read_bl_len; |
johnvanlaanen | 0:99935a94f153 | 422 | uint32_t block_len, mult, blocknr, capacity; |
johnvanlaanen | 0:99935a94f153 | 423 | uint32_t hc_c_size; |
johnvanlaanen | 0:99935a94f153 | 424 | uint64_t blocks; |
johnvanlaanen | 0:99935a94f153 | 425 | |
johnvanlaanen | 0:99935a94f153 | 426 | // CMD9, Response R2 (R1 byte + 16-byte block read) |
johnvanlaanen | 0:99935a94f153 | 427 | if (_cmdx(9, 0) != 0) { |
johnvanlaanen | 0:99935a94f153 | 428 | debug("Didn't get a response from the disk\r\n"); |
johnvanlaanen | 0:99935a94f153 | 429 | return 0; |
johnvanlaanen | 0:99935a94f153 | 430 | } |
johnvanlaanen | 0:99935a94f153 | 431 | |
johnvanlaanen | 0:99935a94f153 | 432 | uint8_t csd[16]; |
johnvanlaanen | 0:99935a94f153 | 433 | if (_read(csd, 16) != 0) { |
johnvanlaanen | 0:99935a94f153 | 434 | debug("Couldn't read csd response from disk\r\n"); |
johnvanlaanen | 0:99935a94f153 | 435 | return 0; |
johnvanlaanen | 0:99935a94f153 | 436 | } |
johnvanlaanen | 0:99935a94f153 | 437 | |
johnvanlaanen | 0:99935a94f153 | 438 | // csd_structure : csd[127:126] |
johnvanlaanen | 0:99935a94f153 | 439 | // c_size : csd[73:62] |
johnvanlaanen | 0:99935a94f153 | 440 | // c_size_mult : csd[49:47] |
johnvanlaanen | 0:99935a94f153 | 441 | // read_bl_len : csd[83:80] - the *maximum* read block length |
johnvanlaanen | 0:99935a94f153 | 442 | |
johnvanlaanen | 0:99935a94f153 | 443 | int csd_structure = ext_bits(csd, 127, 126); |
johnvanlaanen | 0:99935a94f153 | 444 | |
johnvanlaanen | 0:99935a94f153 | 445 | switch (csd_structure) { |
johnvanlaanen | 0:99935a94f153 | 446 | case 0: |
johnvanlaanen | 0:99935a94f153 | 447 | cdv = 512; |
johnvanlaanen | 0:99935a94f153 | 448 | c_size = ext_bits(csd, 73, 62); |
johnvanlaanen | 0:99935a94f153 | 449 | c_size_mult = ext_bits(csd, 49, 47); |
johnvanlaanen | 0:99935a94f153 | 450 | read_bl_len = ext_bits(csd, 83, 80); |
johnvanlaanen | 0:99935a94f153 | 451 | |
johnvanlaanen | 0:99935a94f153 | 452 | block_len = 1 << read_bl_len; |
johnvanlaanen | 0:99935a94f153 | 453 | mult = 1 << (c_size_mult + 2); |
johnvanlaanen | 0:99935a94f153 | 454 | blocknr = (c_size + 1) * mult; |
johnvanlaanen | 0:99935a94f153 | 455 | capacity = blocknr * block_len; |
johnvanlaanen | 0:99935a94f153 | 456 | blocks = capacity / 512; |
johnvanlaanen | 0:99935a94f153 | 457 | debug_if(SD_DBG, "\n\rSDCard\n\rc_size: %d \n\rcapacity: %ld \n\rsectors: %lld\n\r", c_size, capacity, blocks); |
johnvanlaanen | 0:99935a94f153 | 458 | break; |
johnvanlaanen | 0:99935a94f153 | 459 | |
johnvanlaanen | 0:99935a94f153 | 460 | case 1: |
johnvanlaanen | 0:99935a94f153 | 461 | cdv = 1; |
johnvanlaanen | 0:99935a94f153 | 462 | hc_c_size = ext_bits(csd, 63, 48); |
johnvanlaanen | 0:99935a94f153 | 463 | blocks = (hc_c_size+1)*1024; |
johnvanlaanen | 0:99935a94f153 | 464 | 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); |
johnvanlaanen | 0:99935a94f153 | 465 | break; |
johnvanlaanen | 0:99935a94f153 | 466 | |
johnvanlaanen | 0:99935a94f153 | 467 | default: |
johnvanlaanen | 0:99935a94f153 | 468 | debug("CSD struct unsupported\r\n"); |
johnvanlaanen | 0:99935a94f153 | 469 | return 0; |
johnvanlaanen | 0:99935a94f153 | 470 | }; |
johnvanlaanen | 0:99935a94f153 | 471 | return blocks; |
johnvanlaanen | 0:99935a94f153 | 472 | } |
johnvanlaanen | 0:99935a94f153 | 473 | |
johnvanlaanen | 0:99935a94f153 | 474 |