Diff: SDFileSystem/SDFileSystem.cpp

Revision:

27:2f486c766854

Parent:

26:ad43af63b3ea

diff -r ad43af63b3ea -r 2f486c766854 SDFileSystem/SDFileSystem.cpp
--- a/SDFileSystem/SDFileSystem.cpp	Mon Jan 16 19:00:54 2017 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,462 +0,0 @@
-/* mbed Microcontroller Library
- * Copyright (c) 2006-2012 ARM Limited
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
- */
-
-/* Introduction
- * ------------
- * SD and MMC cards support a number of interfaces, but common to them all
- * is one based on SPI. This is the one I'm implmenting because it means
- * it is much more portable even though not so performant, and we already
- * have the mbed SPI Interface!
- *
- * The main reference I'm using is Chapter 7, "SPI Mode" of:
- *  http://www.sdcard.org/developers/tech/sdcard/pls/Simplified_Physical_Layer_Spec.pdf
- *
- * SPI Startup
- * -----------
- * The SD card powers up in SD mode. The SPI interface mode is selected by
- * asserting CS low and sending the reset command (CMD0). The card will
- * respond with a (R1) response.
- *
- * CMD8 is optionally sent to determine the voltage range supported, and
- * indirectly determine whether it is a version 1.x SD/non-SD card or
- * version 2.x. I'll just ignore this for now.
- *
- * ACMD41 is repeatedly issued to initialise the card, until "in idle"
- * (bit 0) of the R1 response goes to '0', indicating it is initialised.
- *
- * You should also indicate whether the host supports High Capicity cards,
- * and check whether the card is high capacity - i'll also ignore this
- *
- * SPI Protocol
- * ------------
- * The SD SPI protocol is based on transactions made up of 8-bit words, with
- * the host starting every bus transaction by asserting the CS signal low. The
- * card always responds to commands, data blocks and errors.
- *
- * The protocol supports a CRC, but by default it is off (except for the
- * first reset CMD0, where the CRC can just be pre-calculated, and CMD8)
- * I'll leave the CRC off I think!
- *
- * Standard capacity cards have variable data block sizes, whereas High
- * Capacity cards fix the size of data block to 512 bytes. I'll therefore
- * just always use the Standard Capacity cards with a block size of 512 bytes.
- * This is set with CMD16.
- *
- * You can read and write single blocks (CMD17, CMD25) or multiple blocks
- * (CMD18, CMD25). For simplicity, I'll just use single block accesses. When
- * the card gets a read command, it responds with a response token, and then
- * a data token or an error.
- *
- * SPI Command Format
- * ------------------
- * Commands are 6-bytes long, containing the command, 32-bit argument, and CRC.
- *
- * +---------------+------------+------------+-----------+----------+--------------+
- * | 01 | cmd[5:0] | arg[31:24] | arg[23:16] | arg[15:8] | arg[7:0] | crc[6:0] | 1 |
- * +---------------+------------+------------+-----------+----------+--------------+
- *
- * As I'm not using CRC, I can fix that byte to what is needed for CMD0 (0x95)
- *
- * All Application Specific commands shall be preceded with APP_CMD (CMD55).
- *
- * SPI Response Format
- * -------------------
- * The main response format (R1) is a status byte (normally zero). Key flags:
- *  idle - 1 if the card is in an idle state/initialising
- *  cmd  - 1 if an illegal command code was detected
- *
- *    +-------------------------------------------------+
- * R1 | 0 | arg | addr | seq | crc | cmd | erase | idle |
- *    +-------------------------------------------------+
- *
- * R1b is the same, except it is followed by a busy signal (zeros) until
- * the first non-zero byte when it is ready again.
- *
- * Data Response Token
- * -------------------
- * Every data block written to the card is acknowledged by a byte
- * response token
- *
- * +----------------------+
- * | xxx | 0 | status | 1 |
- * +----------------------+
- *              010 - OK!
- *              101 - CRC Error
- *              110 - Write Error
- *
- * Single Block Read and Write
- * ---------------------------
- *
- * Block transfers have a byte header, followed by the data, followed
- * by a 16-bit CRC. In our case, the data will always be 512 bytes.
- *
- * +------+---------+---------+- -  - -+---------+-----------+----------+
- * | 0xFE | data[0] | data[1] |        | data[n] | crc[15:8] | crc[7:0] |
- * +------+---------+---------+- -  - -+---------+-----------+----------+
- */
-#include "SDFileSystem.h"
-#include "mbed_debug.h"
-
-#define SD_COMMAND_TIMEOUT 5000
-
-#define SD_DBG             0
-
-SDFileSystem::SDFileSystem(PinName mosi, PinName miso, PinName sclk, PinName cs, const char* name) :
-    FATFileSystem(name), _spi(mosi, miso, sclk), _cs(cs) {
-    _cs = 1;
-}
-
-#define R1_IDLE_STATE           (1 << 0)
-#define R1_ERASE_RESET          (1 << 1)
-#define R1_ILLEGAL_COMMAND      (1 << 2)
-#define R1_COM_CRC_ERROR        (1 << 3)
-#define R1_ERASE_SEQUENCE_ERROR (1 << 4)
-#define R1_ADDRESS_ERROR        (1 << 5)
-#define R1_PARAMETER_ERROR      (1 << 6)
-
-// Types
-#define SDCARD_FAIL 0 //!< v1.x Standard Capacity
-#define SDCARD_V1   1 //!< v2.x Standard Capacity
-#define SDCARD_V2   2 //!< v2.x High Capacity
-#define SDCARD_V2HC 3 //!< Not recognised as an SD Card
-
-int SDFileSystem::initialise_card() {
-    // Set to 100kHz for initialisation, and clock card with cs = 1
-    _spi.frequency(100000);
-    _cs = 1;
-    for (int i = 0; i < 16; i++) {
-        _spi.write(0xFF);
-    }
-    
-    // send CMD0, should return with all zeros except IDLE STATE set (bit 0)
-    if (_cmd(0, 0) != R1_IDLE_STATE) {
-        debug("No disk, or could not put SD card in to SPI idle state\n");
-        return SDCARD_FAIL;
-    }
-    
-    // send CMD8 to determine whther it is ver 2.x
-    int r = _cmd8();
-    if (r == R1_IDLE_STATE) {
-        return initialise_card_v2();
-    } else if (r == (R1_IDLE_STATE | R1_ILLEGAL_COMMAND)) {
-        return initialise_card_v1();
-    } else {
-        debug("Not in idle state after sending CMD8 (not an SD card?)\n");
-        return SDCARD_FAIL;
-    }
-}
-
-int SDFileSystem::initialise_card_v1() {
-    for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
-        _cmd(55, 0);
-        if (_cmd(41, 0) == 0) {
-            cdv = 512;
-            debug_if(SD_DBG, "\n\rInit: SEDCARD_V1\n\r");
-            return SDCARD_V1;
-        }
-    }
-    
-    debug("Timeout waiting for v1.x card\n");
-    return SDCARD_FAIL;
-}
-
-int SDFileSystem::initialise_card_v2() {
-    for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
-        wait_ms(50);
-        _cmd58();
-        _cmd(55, 0);
-        if (_cmd(41, 0x40000000) == 0) {
-            _cmd58();
-            debug_if(SD_DBG, "\n\rInit: SDCARD_V2\n\r");
-            cdv = 1;
-            return SDCARD_V2;
-        }
-    }
-    
-    debug("Timeout waiting for v2.x card\n");
-    return SDCARD_FAIL;
-}
-
-int SDFileSystem::disk_initialize() {
-    int i = initialise_card();
-    debug_if(SD_DBG, "init card = %d\n", i);
-    _sectors = _sd_sectors();
-    
-    // Set block length to 512 (CMD16)
-    if (_cmd(16, 512) != 0) {
-        debug("Set 512-byte block timed out\n");
-        return 1;
-    }
-    
-    _spi.frequency(1000000); // Set to 1MHz for data transfer
-    return 0;
-}
-
-int SDFileSystem::disk_write(const uint8_t *buffer, uint64_t block_number) {
-    // set write address for single block (CMD24)
-    if (_cmd(24, block_number * cdv) != 0) {
-        return 1;
-    }
-    
-    // send the data block
-    _write(buffer, 512);
-    return 0;
-}
-
-int SDFileSystem::disk_read(uint8_t *buffer, uint64_t block_number) {
-    // set read address for single block (CMD17)
-    if (_cmd(17, block_number * cdv) != 0) {
-        return 1;
-    }
-    
-    // receive the data
-    _read(buffer, 512);
-    return 0;
-}
-
-int SDFileSystem::disk_status() { return 0; }
-int SDFileSystem::disk_sync() { return 0; }
-uint64_t SDFileSystem::disk_sectors() { return _sectors; }
-
-
-// PRIVATE FUNCTIONS
-int SDFileSystem::_cmd(int cmd, int arg) {
-    _cs = 0;
-    
-    // send a command
-    _spi.write(0x40 | cmd);
-    _spi.write(arg >> 24);
-    _spi.write(arg >> 16);
-    _spi.write(arg >> 8);
-    _spi.write(arg >> 0);
-    _spi.write(0x95);
-    
-    // wait for the repsonse (response[7] == 0)
-    for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
-        int response = _spi.write(0xFF);
-        if (!(response & 0x80)) {
-            _cs = 1;
-            _spi.write(0xFF);
-            return response;
-        }
-    }
-    _cs = 1;
-    _spi.write(0xFF);
-    return -1; // timeout
-}
-int SDFileSystem::_cmdx(int cmd, int arg) {
-    _cs = 0;
-    
-    // send a command
-    _spi.write(0x40 | cmd);
-    _spi.write(arg >> 24);
-    _spi.write(arg >> 16);
-    _spi.write(arg >> 8);
-    _spi.write(arg >> 0);
-    _spi.write(0x95);
-    
-    // wait for the repsonse (response[7] == 0)
-    for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
-        int response = _spi.write(0xFF);
-        if (!(response & 0x80)) {
-            return response;
-        }
-    }
-    _cs = 1;
-    _spi.write(0xFF);
-    return -1; // timeout
-}
-
-
-int SDFileSystem::_cmd58() {
-    _cs = 0;
-    int arg = 0;
-    
-    // send a command
-    _spi.write(0x40 | 58);
-    _spi.write(arg >> 24);
-    _spi.write(arg >> 16);
-    _spi.write(arg >> 8);
-    _spi.write(arg >> 0);
-    _spi.write(0x95);
-    
-    // wait for the repsonse (response[7] == 0)
-    for (int i = 0; i < SD_COMMAND_TIMEOUT; i++) {
-        int response = _spi.write(0xFF);
-        if (!(response & 0x80)) {
-            int ocr = _spi.write(0xFF) << 24;
-            ocr |= _spi.write(0xFF) << 16;
-            ocr |= _spi.write(0xFF) << 8;
-            ocr |= _spi.write(0xFF) << 0;
-            _cs = 1;
-            _spi.write(0xFF);
-            return response;
-        }
-    }
-    _cs = 1;
-    _spi.write(0xFF);
-    return -1; // timeout
-}
-
-int SDFileSystem::_cmd8() {
-    _cs = 0;
-    
-    // send a command
-    _spi.write(0x40 | 8); // CMD8
-    _spi.write(0x00);     // reserved
-    _spi.write(0x00);     // reserved
-    _spi.write(0x01);     // 3.3v
-    _spi.write(0xAA);     // check pattern
-    _spi.write(0x87);     // crc
-    
-    // wait for the repsonse (response[7] == 0)
-    for (int i = 0; i < SD_COMMAND_TIMEOUT * 1000; i++) {
-        char response[5];
-        response[0] = _spi.write(0xFF);
-        if (!(response[0] & 0x80)) {
-            for (int j = 1; j < 5; j++) {
-                response[i] = _spi.write(0xFF);
-            }
-            _cs = 1;
-            _spi.write(0xFF);
-            return response[0];
-        }
-    }
-    _cs = 1;
-    _spi.write(0xFF);
-    return -1; // timeout
-}
-
-int SDFileSystem::_read(uint8_t *buffer, uint32_t length) {
-    _cs = 0;
-    
-    // read until start byte (0xFF)
-    while (_spi.write(0xFF) != 0xFE);
-    
-    // read data
-    for (int i = 0; i < length; i++) {
-        buffer[i] = _spi.write(0xFF);
-    }
-    _spi.write(0xFF); // checksum
-    _spi.write(0xFF);
-    
-    _cs = 1;
-    _spi.write(0xFF);
-    return 0;
-}
-
-int SDFileSystem::_write(const uint8_t*buffer, uint32_t length) {
-    _cs = 0;
-    
-    // indicate start of block
-    _spi.write(0xFE);
-    
-    // write the data
-    for (int i = 0; i < length; i++) {
-        _spi.write(buffer[i]);
-    }
-    
-    // write the checksum
-    _spi.write(0xFF);
-    _spi.write(0xFF);
-    
-    // check the response token
-    if ((_spi.write(0xFF) & 0x1F) != 0x05) {
-        _cs = 1;
-        _spi.write(0xFF);
-        return 1;
-    }
-    
-    // wait for write to finish
-    while (_spi.write(0xFF) == 0);
-    
-    _cs = 1;
-    _spi.write(0xFF);
-    return 0;
-}
-
-static uint32_t ext_bits(unsigned char *data, int msb, int lsb) {
-    uint32_t bits = 0;
-    uint32_t size = 1 + msb - lsb;
-    for (int i = 0; i < size; i++) {
-        uint32_t position = lsb + i;
-        uint32_t byte = 15 - (position >> 3);
-        uint32_t bit = position & 0x7;
-        uint32_t value = (data[byte] >> bit) & 1;
-        bits |= value << i;
-    }
-    return bits;
-}
-
-uint64_t SDFileSystem::_sd_sectors() {
-    uint32_t c_size, c_size_mult, read_bl_len;
-    uint32_t block_len, mult, blocknr, capacity;
-    uint32_t hc_c_size;
-    uint64_t blocks;
-    
-    // CMD9, Response R2 (R1 byte + 16-byte block read)
-    if (_cmdx(9, 0) != 0) {
-        debug("Didn't get a response from the disk\n");
-        return 0;
-    }
-    
-    uint8_t csd[16];
-    if (_read(csd, 16) != 0) {
-        debug("Couldn't read csd response from disk\n");
-        return 0;
-    }
-    
-    // csd_structure : csd[127:126]
-    // c_size        : csd[73:62]
-    // c_size_mult   : csd[49:47]
-    // read_bl_len   : csd[83:80] - the *maximum* read block length
-    
-    int csd_structure = ext_bits(csd, 127, 126);
-    
-    switch (csd_structure) {
-        case 0:
-            cdv = 512;
-            c_size = ext_bits(csd, 73, 62);
-            c_size_mult = ext_bits(csd, 49, 47);
-            read_bl_len = ext_bits(csd, 83, 80);
-            
-            block_len = 1 << read_bl_len;
-            mult = 1 << (c_size_mult + 2);
-            blocknr = (c_size + 1) * mult;
-            capacity = blocknr * block_len;
-            blocks = capacity / 512;
-            debug_if(SD_DBG, "\n\rSDCard\n\rc_size: %d \n\rcapacity: %ld \n\rsectors: %lld\n\r", c_size, capacity, blocks);
-            break;
-        
-        case 1:
-            cdv = 1;
-            hc_c_size = ext_bits(csd, 63, 48);
-            blocks = (hc_c_size+1)*1024;
-            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);
-            break;
-        
-        default:
-            debug("CSD struct unsupported\r\n");
-            return 0;
-    };
-    return blocks;
-}