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KatsushiOgawa |
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/* mbed SDFileSystem Library, for providing file access to SD cards
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* Copyright (c) 2008-2010, sford
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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/* Introduction
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* ------------
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* SD and MMC cards support a number of interfaces, but common to them all
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* is one based on SPI. This is the one I'm implmenting because it means
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* it is much more portable even though not so performant, and we already
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* have the mbed SPI Interface!
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*
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* The main reference I'm using is Chapter 7, "SPI Mode" of:
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* http://www.sdcard.org/developers/tech/sdcard/pls/Simplified_Physical_Layer_Spec.pdf
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*
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* SPI Startup
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* -----------
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* The SD card powers up in SD mode. The SPI interface mode is selected by
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* asserting CS low and sending the reset command (CMD0). The card will
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* respond with a (R1) response.
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*
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* CMD8 is optionally sent to determine the voltage range supported, and
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* indirectly determine whether it is a version 1.x SD/non-SD card or
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* version 2.x. I'll just ignore this for now.
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*
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* ACMD41 is repeatedly issued to initialise the card, until "in idle"
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* (bit 0) of the R1 response goes to '0', indicating it is initialised.
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*
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* You should also indicate whether the host supports High Capicity cards,
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* and check whether the card is high capacity - i'll also ignore this
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*
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* SPI Protocol
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* ------------
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* The SD SPI protocol is based on transactions made up of 8-bit words, with
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* the host starting every bus transaction by asserting the CS signal low. The
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* card always responds to commands, data blocks and errors.
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*
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* The protocol supports a CRC, but by default it is off (except for the
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* first reset CMD0, where the CRC can just be pre-calculated, and CMD8)
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* I'll leave the CRC off I think!
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*
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* Standard capacity cards have variable data block sizes, whereas High
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* Capacity cards fix the size of data block to 512 bytes. I'll therefore
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* just always use the Standard Capacity cards with a block size of 512 bytes.
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* This is set with CMD16.
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*
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* You can read and write single blocks (CMD17, CMD25) or multiple blocks
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* (CMD18, CMD25). For simplicity, I'll just use single block accesses. When
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* the card gets a read command, it responds with a response token, and then
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* a data token or an error.
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*
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* SPI Command Format
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* ------------------
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* Commands are 6-bytes long, containing the command, 32-bit argument, and CRC.
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*
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* +---------------+------------+------------+-----------+----------+--------------+
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* | 01 | cmd[5:0] | arg[31:24] | arg[23:16] | arg[15:8] | arg[7:0] | crc[6:0] | 1 |
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* +---------------+------------+------------+-----------+----------+--------------+
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*
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* As I'm not using CRC, I can fix that byte to what is needed for CMD0 (0x95)
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*
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* All Application Specific commands shall be preceded with APP_CMD (CMD55).
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*
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* SPI Response Format
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* -------------------
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* The main response format (R1) is a status byte (normally zero). Key flags:
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* idle - 1 if the card is in an idle state/initialising
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* cmd - 1 if an illegal command code was detected
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*
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* +-------------------------------------------------+
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* R1 | 0 | arg | addr | seq | crc | cmd | erase | idle |
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* +-------------------------------------------------+
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*
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* R1b is the same, except it is followed by a busy signal (zeros) until
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* the first non-zero byte when it is ready again.
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*
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* Data Response Token
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95
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* -------------------
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* Every data block written to the card is acknowledged by a byte
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* response token
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*
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* +----------------------+
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* | xxx | 0 | status | 1 |
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* +----------------------+
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* 010 - OK!
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* 101 - CRC Error
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* 110 - Write Error
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*
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* Single Block Read and Write
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* ---------------------------
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*
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* Block transfers have a byte header, followed by the data, followed
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* by a 16-bit CRC. In our case, the data will always be 512 bytes.
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*
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* +------+---------+---------+- - - -+---------+-----------+----------+
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* | 0xFE | data[0] | data[1] | | data[n] | crc[15:8] | crc[7:0] |
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* +------+---------+---------+- - - -+---------+-----------+----------+
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*/
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#include "SDFileSystem.h"
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#define SD_COMMAND_TIMEOUT 5000
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SDFileSystem::SDFileSystem(PinName mosi, PinName miso, PinName sclk, PinName cs, const char* name) :
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FATFileSystem(name), _spi(mosi, miso, sclk), _cs(cs) {
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_cs = 1;
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}
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#define R1_IDLE_STATE (1 << 0)
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#define R1_ERASE_RESET (1 << 1)
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#define R1_ILLEGAL_COMMAND (1 << 2)
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#define R1_COM_CRC_ERROR (1 << 3)
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#define R1_ERASE_SEQUENCE_ERROR (1 << 4)
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#define R1_ADDRESS_ERROR (1 << 5)
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#define R1_PARAMETER_ERROR (1 << 6)
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// Types
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// - v1.x Standard Capacity
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// - v2.x Standard Capacity
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// - v2.x High Capacity
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// - Not recognised as an SD Card
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#define SDCARD_FAIL 0
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#define SDCARD_V1 1
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#define SDCARD_V2 2
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#define SDCARD_V2HC 3
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int SDFileSystem::initialise_card() {
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// Set to 100kHz for initialisation, and clock card with cs = 1
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_spi.frequency(100000);
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_cs = 1;
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for(int i=0; i<16; i++) {
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_spi.write(0xFF);
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}
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// send CMD0, should return with all zeros except IDLE STATE set (bit 0)
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if(_cmd(0, 0) != R1_IDLE_STATE) {
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fprintf(stderr, "No disk, or could not put SD card in to SPI idle state\n");
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return SDCARD_FAIL;
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}
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// send CMD8 to determine whther it is ver 2.x
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int r = _cmd8();
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if(r == R1_IDLE_STATE) {
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return initialise_card_v2();
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} else if(r == (R1_IDLE_STATE | R1_ILLEGAL_COMMAND)) {
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return initialise_card_v1();
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} else {
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fprintf(stderr, "Not in idle state after sending CMD8 (not an SD card?)\n");
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return SDCARD_FAIL;
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}
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}
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int SDFileSystem::initialise_card_v1() {
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for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
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_cmd(55, 0);
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if(_cmd(41, 0) == 0) {
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return SDCARD_V1;
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}
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}
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fprintf(stderr, "Timeout waiting for v1.x card\n");
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return SDCARD_FAIL;
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}
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int SDFileSystem::initialise_card_v2() {
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184
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185
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for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
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_cmd(55, 0);
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if(_cmd(41, 0) == 0) {
|
KatsushiOgawa |
0:d496b40b6943
|
188
|
_cmd58();
|
KatsushiOgawa |
0:d496b40b6943
|
189
|
return SDCARD_V2;
|
KatsushiOgawa |
0:d496b40b6943
|
190
|
}
|
KatsushiOgawa |
0:d496b40b6943
|
191
|
}
|
KatsushiOgawa |
0:d496b40b6943
|
192
|
|
KatsushiOgawa |
0:d496b40b6943
|
193
|
fprintf(stderr, "Timeout waiting for v2.x card\n");
|
KatsushiOgawa |
0:d496b40b6943
|
194
|
return SDCARD_FAIL;
|
KatsushiOgawa |
0:d496b40b6943
|
195
|
}
|
KatsushiOgawa |
0:d496b40b6943
|
196
|
|
KatsushiOgawa |
0:d496b40b6943
|
197
|
int SDFileSystem::disk_initialize() {
|
KatsushiOgawa |
0:d496b40b6943
|
198
|
|
KatsushiOgawa |
0:d496b40b6943
|
199
|
int i = initialise_card();
|
KatsushiOgawa |
0:d496b40b6943
|
200
|
// printf("init card = %d\n", i);
|
KatsushiOgawa |
0:d496b40b6943
|
201
|
// printf("OK\n");
|
KatsushiOgawa |
0:d496b40b6943
|
202
|
|
KatsushiOgawa |
0:d496b40b6943
|
203
|
_sectors = _sd_sectors();
|
KatsushiOgawa |
0:d496b40b6943
|
204
|
|
KatsushiOgawa |
0:d496b40b6943
|
205
|
// Set block length to 512 (CMD16)
|
KatsushiOgawa |
0:d496b40b6943
|
206
|
if(_cmd(16, 512) != 0) {
|
KatsushiOgawa |
0:d496b40b6943
|
207
|
fprintf(stderr, "Set 512-byte block timed out\n");
|
KatsushiOgawa |
0:d496b40b6943
|
208
|
return 1;
|
KatsushiOgawa |
0:d496b40b6943
|
209
|
}
|
KatsushiOgawa |
0:d496b40b6943
|
210
|
|
KatsushiOgawa |
0:d496b40b6943
|
211
|
_spi.frequency(1000000); // Set to 1MHz for data transfer
|
KatsushiOgawa |
0:d496b40b6943
|
212
|
return 0;
|
KatsushiOgawa |
0:d496b40b6943
|
213
|
}
|
KatsushiOgawa |
0:d496b40b6943
|
214
|
|
KatsushiOgawa |
0:d496b40b6943
|
215
|
int SDFileSystem::disk_write(const char *buffer, int block_number) {
|
KatsushiOgawa |
0:d496b40b6943
|
216
|
// set write address for single block (CMD24)
|
KatsushiOgawa |
0:d496b40b6943
|
217
|
if(_cmd(24, block_number * 512) != 0) {
|
KatsushiOgawa |
0:d496b40b6943
|
218
|
return 1;
|
KatsushiOgawa |
0:d496b40b6943
|
219
|
}
|
KatsushiOgawa |
0:d496b40b6943
|
220
|
|
KatsushiOgawa |
0:d496b40b6943
|
221
|
// send the data block
|
KatsushiOgawa |
0:d496b40b6943
|
222
|
_write(buffer, 512);
|
KatsushiOgawa |
0:d496b40b6943
|
223
|
return 0;
|
KatsushiOgawa |
0:d496b40b6943
|
224
|
}
|
KatsushiOgawa |
0:d496b40b6943
|
225
|
|
KatsushiOgawa |
0:d496b40b6943
|
226
|
int SDFileSystem::disk_read(char *buffer, int block_number) {
|
KatsushiOgawa |
0:d496b40b6943
|
227
|
// set read address for single block (CMD17)
|
KatsushiOgawa |
0:d496b40b6943
|
228
|
if(_cmd(17, block_number * 512) != 0) {
|
KatsushiOgawa |
0:d496b40b6943
|
229
|
return 1;
|
KatsushiOgawa |
0:d496b40b6943
|
230
|
}
|
KatsushiOgawa |
0:d496b40b6943
|
231
|
|
KatsushiOgawa |
0:d496b40b6943
|
232
|
// receive the data
|
KatsushiOgawa |
0:d496b40b6943
|
233
|
_read(buffer, 512);
|
KatsushiOgawa |
0:d496b40b6943
|
234
|
return 0;
|
KatsushiOgawa |
0:d496b40b6943
|
235
|
}
|
KatsushiOgawa |
0:d496b40b6943
|
236
|
|
KatsushiOgawa |
0:d496b40b6943
|
237
|
int SDFileSystem::disk_status() { return 0; }
|
KatsushiOgawa |
0:d496b40b6943
|
238
|
int SDFileSystem::disk_sync() { return 0; }
|
KatsushiOgawa |
0:d496b40b6943
|
239
|
int SDFileSystem::disk_sectors() { return _sectors; }
|
KatsushiOgawa |
0:d496b40b6943
|
240
|
|
KatsushiOgawa |
0:d496b40b6943
|
241
|
// PRIVATE FUNCTIONS
|
KatsushiOgawa |
0:d496b40b6943
|
242
|
|
KatsushiOgawa |
0:d496b40b6943
|
243
|
int SDFileSystem::_cmd(int cmd, int arg) {
|
KatsushiOgawa |
0:d496b40b6943
|
244
|
_cs = 0;
|
KatsushiOgawa |
0:d496b40b6943
|
245
|
|
KatsushiOgawa |
0:d496b40b6943
|
246
|
// send a command
|
KatsushiOgawa |
0:d496b40b6943
|
247
|
_spi.write(0x40 | cmd);
|
KatsushiOgawa |
0:d496b40b6943
|
248
|
_spi.write(arg >> 24);
|
KatsushiOgawa |
0:d496b40b6943
|
249
|
_spi.write(arg >> 16);
|
KatsushiOgawa |
0:d496b40b6943
|
250
|
_spi.write(arg >> 8);
|
KatsushiOgawa |
0:d496b40b6943
|
251
|
_spi.write(arg >> 0);
|
KatsushiOgawa |
0:d496b40b6943
|
252
|
_spi.write(0x95);
|
KatsushiOgawa |
0:d496b40b6943
|
253
|
|
KatsushiOgawa |
0:d496b40b6943
|
254
|
// wait for the repsonse (response[7] == 0)
|
KatsushiOgawa |
0:d496b40b6943
|
255
|
for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
|
KatsushiOgawa |
0:d496b40b6943
|
256
|
int response = _spi.write(0xFF);
|
KatsushiOgawa |
0:d496b40b6943
|
257
|
if(!(response & 0x80)) {
|
KatsushiOgawa |
0:d496b40b6943
|
258
|
_cs = 1;
|
KatsushiOgawa |
0:d496b40b6943
|
259
|
_spi.write(0xFF);
|
KatsushiOgawa |
0:d496b40b6943
|
260
|
return response;
|
KatsushiOgawa |
0:d496b40b6943
|
261
|
}
|
KatsushiOgawa |
0:d496b40b6943
|
262
|
}
|
KatsushiOgawa |
0:d496b40b6943
|
263
|
_cs = 1;
|
KatsushiOgawa |
0:d496b40b6943
|
264
|
_spi.write(0xFF);
|
KatsushiOgawa |
0:d496b40b6943
|
265
|
return -1; // timeout
|
KatsushiOgawa |
0:d496b40b6943
|
266
|
}
|
KatsushiOgawa |
0:d496b40b6943
|
267
|
int SDFileSystem::_cmdx(int cmd, int arg) {
|
KatsushiOgawa |
0:d496b40b6943
|
268
|
_cs = 0;
|
KatsushiOgawa |
0:d496b40b6943
|
269
|
|
KatsushiOgawa |
0:d496b40b6943
|
270
|
// send a command
|
KatsushiOgawa |
0:d496b40b6943
|
271
|
_spi.write(0x40 | cmd);
|
KatsushiOgawa |
0:d496b40b6943
|
272
|
_spi.write(arg >> 24);
|
KatsushiOgawa |
0:d496b40b6943
|
273
|
_spi.write(arg >> 16);
|
KatsushiOgawa |
0:d496b40b6943
|
274
|
_spi.write(arg >> 8);
|
KatsushiOgawa |
0:d496b40b6943
|
275
|
_spi.write(arg >> 0);
|
KatsushiOgawa |
0:d496b40b6943
|
276
|
_spi.write(0x95);
|
KatsushiOgawa |
0:d496b40b6943
|
277
|
|
KatsushiOgawa |
0:d496b40b6943
|
278
|
// wait for the repsonse (response[7] == 0)
|
KatsushiOgawa |
0:d496b40b6943
|
279
|
for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
|
KatsushiOgawa |
0:d496b40b6943
|
280
|
int response = _spi.write(0xFF);
|
KatsushiOgawa |
0:d496b40b6943
|
281
|
if(!(response & 0x80)) {
|
KatsushiOgawa |
0:d496b40b6943
|
282
|
return response;
|
KatsushiOgawa |
0:d496b40b6943
|
283
|
}
|
KatsushiOgawa |
0:d496b40b6943
|
284
|
}
|
KatsushiOgawa |
0:d496b40b6943
|
285
|
_cs = 1;
|
KatsushiOgawa |
0:d496b40b6943
|
286
|
_spi.write(0xFF);
|
KatsushiOgawa |
0:d496b40b6943
|
287
|
return -1; // timeout
|
KatsushiOgawa |
0:d496b40b6943
|
288
|
}
|
KatsushiOgawa |
0:d496b40b6943
|
289
|
|
KatsushiOgawa |
0:d496b40b6943
|
290
|
|
KatsushiOgawa |
0:d496b40b6943
|
291
|
int SDFileSystem::_cmd58() {
|
KatsushiOgawa |
0:d496b40b6943
|
292
|
_cs = 0;
|
KatsushiOgawa |
0:d496b40b6943
|
293
|
int arg = 0;
|
KatsushiOgawa |
0:d496b40b6943
|
294
|
|
KatsushiOgawa |
0:d496b40b6943
|
295
|
// send a command
|
KatsushiOgawa |
0:d496b40b6943
|
296
|
_spi.write(0x40 | 58);
|
KatsushiOgawa |
0:d496b40b6943
|
297
|
_spi.write(arg >> 24);
|
KatsushiOgawa |
0:d496b40b6943
|
298
|
_spi.write(arg >> 16);
|
KatsushiOgawa |
0:d496b40b6943
|
299
|
_spi.write(arg >> 8);
|
KatsushiOgawa |
0:d496b40b6943
|
300
|
_spi.write(arg >> 0);
|
KatsushiOgawa |
0:d496b40b6943
|
301
|
_spi.write(0x95);
|
KatsushiOgawa |
0:d496b40b6943
|
302
|
|
KatsushiOgawa |
0:d496b40b6943
|
303
|
// wait for the repsonse (response[7] == 0)
|
KatsushiOgawa |
0:d496b40b6943
|
304
|
for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
|
KatsushiOgawa |
0:d496b40b6943
|
305
|
int response = _spi.write(0xFF);
|
KatsushiOgawa |
0:d496b40b6943
|
306
|
if(!(response & 0x80)) {
|
KatsushiOgawa |
0:d496b40b6943
|
307
|
int ocr = _spi.write(0xFF) << 24;
|
KatsushiOgawa |
0:d496b40b6943
|
308
|
ocr |= _spi.write(0xFF) << 16;
|
KatsushiOgawa |
0:d496b40b6943
|
309
|
ocr |= _spi.write(0xFF) << 8;
|
KatsushiOgawa |
0:d496b40b6943
|
310
|
ocr |= _spi.write(0xFF) << 0;
|
KatsushiOgawa |
0:d496b40b6943
|
311
|
// printf("OCR = 0x%08X\n", ocr);
|
KatsushiOgawa |
0:d496b40b6943
|
312
|
_cs = 1;
|
KatsushiOgawa |
0:d496b40b6943
|
313
|
_spi.write(0xFF);
|
KatsushiOgawa |
0:d496b40b6943
|
314
|
return response;
|
KatsushiOgawa |
0:d496b40b6943
|
315
|
}
|
KatsushiOgawa |
0:d496b40b6943
|
316
|
}
|
KatsushiOgawa |
0:d496b40b6943
|
317
|
_cs = 1;
|
KatsushiOgawa |
0:d496b40b6943
|
318
|
_spi.write(0xFF);
|
KatsushiOgawa |
0:d496b40b6943
|
319
|
return -1; // timeout
|
KatsushiOgawa |
0:d496b40b6943
|
320
|
}
|
KatsushiOgawa |
0:d496b40b6943
|
321
|
|
KatsushiOgawa |
0:d496b40b6943
|
322
|
int SDFileSystem::_cmd8() {
|
KatsushiOgawa |
0:d496b40b6943
|
323
|
_cs = 0;
|
KatsushiOgawa |
0:d496b40b6943
|
324
|
|
KatsushiOgawa |
0:d496b40b6943
|
325
|
// send a command
|
KatsushiOgawa |
0:d496b40b6943
|
326
|
_spi.write(0x40 | 8); // CMD8
|
KatsushiOgawa |
0:d496b40b6943
|
327
|
_spi.write(0x00); // reserved
|
KatsushiOgawa |
0:d496b40b6943
|
328
|
_spi.write(0x00); // reserved
|
KatsushiOgawa |
0:d496b40b6943
|
329
|
_spi.write(0x01); // 3.3v
|
KatsushiOgawa |
0:d496b40b6943
|
330
|
_spi.write(0xAA); // check pattern
|
KatsushiOgawa |
0:d496b40b6943
|
331
|
_spi.write(0x87); // crc
|
KatsushiOgawa |
0:d496b40b6943
|
332
|
|
KatsushiOgawa |
0:d496b40b6943
|
333
|
// wait for the repsonse (response[7] == 0)
|
KatsushiOgawa |
0:d496b40b6943
|
334
|
for(int i=0; i<SD_COMMAND_TIMEOUT * 1000; i++) {
|
KatsushiOgawa |
0:d496b40b6943
|
335
|
char response[5];
|
KatsushiOgawa |
0:d496b40b6943
|
336
|
response[0] = _spi.write(0xFF);
|
KatsushiOgawa |
0:d496b40b6943
|
337
|
if(!(response[0] & 0x80)) {
|
KatsushiOgawa |
0:d496b40b6943
|
338
|
for(int j=1; j<5; j++) {
|
KatsushiOgawa |
0:d496b40b6943
|
339
|
response[i] = _spi.write(0xFF);
|
KatsushiOgawa |
0:d496b40b6943
|
340
|
}
|
KatsushiOgawa |
0:d496b40b6943
|
341
|
_cs = 1;
|
KatsushiOgawa |
0:d496b40b6943
|
342
|
_spi.write(0xFF);
|
KatsushiOgawa |
0:d496b40b6943
|
343
|
return response[0];
|
KatsushiOgawa |
0:d496b40b6943
|
344
|
}
|
KatsushiOgawa |
0:d496b40b6943
|
345
|
}
|
KatsushiOgawa |
0:d496b40b6943
|
346
|
_cs = 1;
|
KatsushiOgawa |
0:d496b40b6943
|
347
|
_spi.write(0xFF);
|
KatsushiOgawa |
0:d496b40b6943
|
348
|
return -1; // timeout
|
KatsushiOgawa |
0:d496b40b6943
|
349
|
}
|
KatsushiOgawa |
0:d496b40b6943
|
350
|
|
KatsushiOgawa |
0:d496b40b6943
|
351
|
int SDFileSystem::_read(char *buffer, int length) {
|
KatsushiOgawa |
0:d496b40b6943
|
352
|
_cs = 0;
|
KatsushiOgawa |
0:d496b40b6943
|
353
|
|
KatsushiOgawa |
0:d496b40b6943
|
354
|
// read until start byte (0xFF)
|
KatsushiOgawa |
0:d496b40b6943
|
355
|
while(_spi.write(0xFF) != 0xFE);
|
KatsushiOgawa |
0:d496b40b6943
|
356
|
|
KatsushiOgawa |
0:d496b40b6943
|
357
|
// read data
|
KatsushiOgawa |
0:d496b40b6943
|
358
|
for(int i=0; i<length; i++) {
|
KatsushiOgawa |
0:d496b40b6943
|
359
|
buffer[i] = _spi.write(0xFF);
|
KatsushiOgawa |
0:d496b40b6943
|
360
|
}
|
KatsushiOgawa |
0:d496b40b6943
|
361
|
_spi.write(0xFF); // checksum
|
KatsushiOgawa |
0:d496b40b6943
|
362
|
_spi.write(0xFF);
|
KatsushiOgawa |
0:d496b40b6943
|
363
|
|
KatsushiOgawa |
0:d496b40b6943
|
364
|
_cs = 1;
|
KatsushiOgawa |
0:d496b40b6943
|
365
|
_spi.write(0xFF);
|
KatsushiOgawa |
0:d496b40b6943
|
366
|
return 0;
|
KatsushiOgawa |
0:d496b40b6943
|
367
|
}
|
KatsushiOgawa |
0:d496b40b6943
|
368
|
|
KatsushiOgawa |
0:d496b40b6943
|
369
|
int SDFileSystem::_write(const char *buffer, int length) {
|
KatsushiOgawa |
0:d496b40b6943
|
370
|
_cs = 0;
|
KatsushiOgawa |
0:d496b40b6943
|
371
|
|
KatsushiOgawa |
0:d496b40b6943
|
372
|
// indicate start of block
|
KatsushiOgawa |
0:d496b40b6943
|
373
|
_spi.write(0xFE);
|
KatsushiOgawa |
0:d496b40b6943
|
374
|
|
KatsushiOgawa |
0:d496b40b6943
|
375
|
// write the data
|
KatsushiOgawa |
0:d496b40b6943
|
376
|
for(int i=0; i<length; i++) {
|
KatsushiOgawa |
0:d496b40b6943
|
377
|
_spi.write(buffer[i]);
|
KatsushiOgawa |
0:d496b40b6943
|
378
|
}
|
KatsushiOgawa |
0:d496b40b6943
|
379
|
|
KatsushiOgawa |
0:d496b40b6943
|
380
|
// write the checksum
|
KatsushiOgawa |
0:d496b40b6943
|
381
|
_spi.write(0xFF);
|
KatsushiOgawa |
0:d496b40b6943
|
382
|
_spi.write(0xFF);
|
KatsushiOgawa |
0:d496b40b6943
|
383
|
|
KatsushiOgawa |
0:d496b40b6943
|
384
|
// check the repsonse token
|
KatsushiOgawa |
0:d496b40b6943
|
385
|
if((_spi.write(0xFF) & 0x1F) != 0x05) {
|
KatsushiOgawa |
0:d496b40b6943
|
386
|
_cs = 1;
|
KatsushiOgawa |
0:d496b40b6943
|
387
|
_spi.write(0xFF);
|
KatsushiOgawa |
0:d496b40b6943
|
388
|
return 1;
|
KatsushiOgawa |
0:d496b40b6943
|
389
|
}
|
KatsushiOgawa |
0:d496b40b6943
|
390
|
|
KatsushiOgawa |
0:d496b40b6943
|
391
|
// wait for write to finish
|
KatsushiOgawa |
0:d496b40b6943
|
392
|
while(_spi.write(0xFF) == 0);
|
KatsushiOgawa |
0:d496b40b6943
|
393
|
|
KatsushiOgawa |
0:d496b40b6943
|
394
|
_cs = 1;
|
KatsushiOgawa |
0:d496b40b6943
|
395
|
_spi.write(0xFF);
|
KatsushiOgawa |
0:d496b40b6943
|
396
|
return 0;
|
KatsushiOgawa |
0:d496b40b6943
|
397
|
}
|
KatsushiOgawa |
0:d496b40b6943
|
398
|
|
KatsushiOgawa |
0:d496b40b6943
|
399
|
static int ext_bits(char *data, int msb, int lsb) {
|
KatsushiOgawa |
0:d496b40b6943
|
400
|
int bits = 0;
|
KatsushiOgawa |
0:d496b40b6943
|
401
|
int size = 1 + msb - lsb;
|
KatsushiOgawa |
0:d496b40b6943
|
402
|
for(int i=0; i<size; i++) {
|
KatsushiOgawa |
0:d496b40b6943
|
403
|
int position = lsb + i;
|
KatsushiOgawa |
0:d496b40b6943
|
404
|
int byte = 15 - (position >> 3);
|
KatsushiOgawa |
0:d496b40b6943
|
405
|
int bit = position & 0x7;
|
KatsushiOgawa |
0:d496b40b6943
|
406
|
int value = (data[byte] >> bit) & 1;
|
KatsushiOgawa |
0:d496b40b6943
|
407
|
bits |= value << i;
|
KatsushiOgawa |
0:d496b40b6943
|
408
|
}
|
KatsushiOgawa |
0:d496b40b6943
|
409
|
return bits;
|
KatsushiOgawa |
0:d496b40b6943
|
410
|
}
|
KatsushiOgawa |
0:d496b40b6943
|
411
|
|
KatsushiOgawa |
0:d496b40b6943
|
412
|
int SDFileSystem::_sd_sectors() {
|
KatsushiOgawa |
0:d496b40b6943
|
413
|
|
KatsushiOgawa |
0:d496b40b6943
|
414
|
// CMD9, Response R2 (R1 byte + 16-byte block read)
|
KatsushiOgawa |
0:d496b40b6943
|
415
|
if(_cmdx(9, 0) != 0) {
|
KatsushiOgawa |
0:d496b40b6943
|
416
|
fprintf(stderr, "Didn't get a response from the disk\n");
|
KatsushiOgawa |
0:d496b40b6943
|
417
|
return 0;
|
KatsushiOgawa |
0:d496b40b6943
|
418
|
}
|
KatsushiOgawa |
0:d496b40b6943
|
419
|
|
KatsushiOgawa |
0:d496b40b6943
|
420
|
char csd[16];
|
KatsushiOgawa |
0:d496b40b6943
|
421
|
if(_read(csd, 16) != 0) {
|
KatsushiOgawa |
0:d496b40b6943
|
422
|
fprintf(stderr, "Couldn't read csd response from disk\n");
|
KatsushiOgawa |
0:d496b40b6943
|
423
|
return 0;
|
KatsushiOgawa |
0:d496b40b6943
|
424
|
}
|
KatsushiOgawa |
0:d496b40b6943
|
425
|
|
KatsushiOgawa |
0:d496b40b6943
|
426
|
// csd_structure : csd[127:126]
|
KatsushiOgawa |
0:d496b40b6943
|
427
|
// c_size : csd[73:62]
|
KatsushiOgawa |
0:d496b40b6943
|
428
|
// c_size_mult : csd[49:47]
|
KatsushiOgawa |
0:d496b40b6943
|
429
|
// read_bl_len : csd[83:80] - the *maximum* read block length
|
KatsushiOgawa |
0:d496b40b6943
|
430
|
|
KatsushiOgawa |
0:d496b40b6943
|
431
|
int csd_structure = ext_bits(csd, 127, 126);
|
KatsushiOgawa |
0:d496b40b6943
|
432
|
int c_size = ext_bits(csd, 73, 62);
|
KatsushiOgawa |
0:d496b40b6943
|
433
|
int c_size_mult = ext_bits(csd, 49, 47);
|
KatsushiOgawa |
0:d496b40b6943
|
434
|
int read_bl_len = ext_bits(csd, 83, 80);
|
KatsushiOgawa |
0:d496b40b6943
|
435
|
|
KatsushiOgawa |
0:d496b40b6943
|
436
|
// printf("CSD_STRUCT = %d\n", csd_structure);
|
KatsushiOgawa |
0:d496b40b6943
|
437
|
|
KatsushiOgawa |
0:d496b40b6943
|
438
|
if(csd_structure != 0) {
|
KatsushiOgawa |
0:d496b40b6943
|
439
|
fprintf(stderr, "This disk tastes funny! I only know about type 0 CSD structures\n");
|
KatsushiOgawa |
0:d496b40b6943
|
440
|
return 0;
|
KatsushiOgawa |
0:d496b40b6943
|
441
|
}
|
KatsushiOgawa |
0:d496b40b6943
|
442
|
|
KatsushiOgawa |
0:d496b40b6943
|
443
|
// memory capacity = BLOCKNR * BLOCK_LEN
|
KatsushiOgawa |
0:d496b40b6943
|
444
|
// where
|
KatsushiOgawa |
0:d496b40b6943
|
445
|
// BLOCKNR = (C_SIZE+1) * MULT
|
KatsushiOgawa |
0:d496b40b6943
|
446
|
// MULT = 2^(C_SIZE_MULT+2) (C_SIZE_MULT < 8)
|
KatsushiOgawa |
0:d496b40b6943
|
447
|
// BLOCK_LEN = 2^READ_BL_LEN, (READ_BL_LEN < 12)
|
KatsushiOgawa |
0:d496b40b6943
|
448
|
|
KatsushiOgawa |
0:d496b40b6943
|
449
|
int block_len = 1 << read_bl_len;
|
KatsushiOgawa |
0:d496b40b6943
|
450
|
int mult = 1 << (c_size_mult + 2);
|
KatsushiOgawa |
0:d496b40b6943
|
451
|
int blocknr = (c_size + 1) * mult;
|
KatsushiOgawa |
0:d496b40b6943
|
452
|
int capacity = blocknr * block_len;
|
KatsushiOgawa |
0:d496b40b6943
|
453
|
|
KatsushiOgawa |
0:d496b40b6943
|
454
|
int blocks = capacity / 512;
|
KatsushiOgawa |
0:d496b40b6943
|
455
|
|
KatsushiOgawa |
0:d496b40b6943
|
456
|
return blocks;
|
KatsushiOgawa |
0:d496b40b6943
|
457
|
}
|