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xeye_ atsu / Mbed 2 deprecated I2S_AIC23B_32khz_wavtest

SDHCFileSystem.cpp@0:63ed631d8c3a, 2011-01-21 (annotated)

Committer:: lynxeyed_atsu
Date:: Fri Jan 21 08:39:48 2011 +0000
Revision:: 0:63ed631d8c3a

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User	Revision	Line number	New contents of line
lynxeyed_atsu	0:63ed631d8c3a	1	/* mbed SDFileSystem Library, for providing file access to SD cards
lynxeyed_atsu	0:63ed631d8c3a	2	* Copyright (c) 2008-2010, sford
lynxeyed_atsu	0:63ed631d8c3a	3	*
lynxeyed_atsu	0:63ed631d8c3a	4	* Permission is hereby granted, free of charge, to any person obtaining a copy
lynxeyed_atsu	0:63ed631d8c3a	5	* of this software and associated documentation files (the "Software"), to deal
lynxeyed_atsu	0:63ed631d8c3a	6	* in the Software without restriction, including without limitation the rights
lynxeyed_atsu	0:63ed631d8c3a	7	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
lynxeyed_atsu	0:63ed631d8c3a	8	* copies of the Software, and to permit persons to whom the Software is
lynxeyed_atsu	0:63ed631d8c3a	9	* furnished to do so, subject to the following conditions:
lynxeyed_atsu	0:63ed631d8c3a	10	*
lynxeyed_atsu	0:63ed631d8c3a	11	* The above copyright notice and this permission notice shall be included in
lynxeyed_atsu	0:63ed631d8c3a	12	* all copies or substantial portions of the Software.
lynxeyed_atsu	0:63ed631d8c3a	13	*
lynxeyed_atsu	0:63ed631d8c3a	14	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
lynxeyed_atsu	0:63ed631d8c3a	15	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
lynxeyed_atsu	0:63ed631d8c3a	16	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
lynxeyed_atsu	0:63ed631d8c3a	17	* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
lynxeyed_atsu	0:63ed631d8c3a	18	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
lynxeyed_atsu	0:63ed631d8c3a	19	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
lynxeyed_atsu	0:63ed631d8c3a	20	* THE SOFTWARE.
lynxeyed_atsu	0:63ed631d8c3a	21	*/
lynxeyed_atsu	0:63ed631d8c3a	22
lynxeyed_atsu	0:63ed631d8c3a	23	/* Introduction
lynxeyed_atsu	0:63ed631d8c3a	24	* ------------
lynxeyed_atsu	0:63ed631d8c3a	25	* SD and MMC cards support a number of interfaces, but common to them all
lynxeyed_atsu	0:63ed631d8c3a	26	* is one based on SPI. This is the one I'm implmenting because it means
lynxeyed_atsu	0:63ed631d8c3a	27	* it is much more portable even though not so performant, and we already
lynxeyed_atsu	0:63ed631d8c3a	28	* have the mbed SPI Interface!
lynxeyed_atsu	0:63ed631d8c3a	29	*
lynxeyed_atsu	0:63ed631d8c3a	30	* The main reference I'm using is Chapter 7, "SPI Mode" of:
lynxeyed_atsu	0:63ed631d8c3a	31	* http://www.sdcard.org/developers/tech/sdcard/pls/Simplified_Physical_Layer_Spec.pdf
lynxeyed_atsu	0:63ed631d8c3a	32	*
lynxeyed_atsu	0:63ed631d8c3a	33	* SPI Startup
lynxeyed_atsu	0:63ed631d8c3a	34	* -----------
lynxeyed_atsu	0:63ed631d8c3a	35	* The SD card powers up in SD mode. The SPI interface mode is selected by
lynxeyed_atsu	0:63ed631d8c3a	36	* asserting CS low and sending the reset command (CMD0). The card will
lynxeyed_atsu	0:63ed631d8c3a	37	* respond with a (R1) response.
lynxeyed_atsu	0:63ed631d8c3a	38	*
lynxeyed_atsu	0:63ed631d8c3a	39	* CMD8 is optionally sent to determine the voltage range supported, and
lynxeyed_atsu	0:63ed631d8c3a	40	* indirectly determine whether it is a version 1.x SD/non-SD card or
lynxeyed_atsu	0:63ed631d8c3a	41	* version 2.x. I'll just ignore this for now.
lynxeyed_atsu	0:63ed631d8c3a	42	*
lynxeyed_atsu	0:63ed631d8c3a	43	* ACMD41 is repeatedly issued to initialise the card, until "in idle"
lynxeyed_atsu	0:63ed631d8c3a	44	* (bit 0) of the R1 response goes to '0', indicating it is initialised.
lynxeyed_atsu	0:63ed631d8c3a	45	*
lynxeyed_atsu	0:63ed631d8c3a	46	* You should also indicate whether the host supports High Capicity cards,
lynxeyed_atsu	0:63ed631d8c3a	47	* and check whether the card is high capacity - i'll also ignore this
lynxeyed_atsu	0:63ed631d8c3a	48	*
lynxeyed_atsu	0:63ed631d8c3a	49	* SPI Protocol
lynxeyed_atsu	0:63ed631d8c3a	50	* ------------
lynxeyed_atsu	0:63ed631d8c3a	51	* The SD SPI protocol is based on transactions made up of 8-bit words, with
lynxeyed_atsu	0:63ed631d8c3a	52	* the host starting every bus transaction by asserting the CS signal low. The
lynxeyed_atsu	0:63ed631d8c3a	53	* card always responds to commands, data blocks and errors.
lynxeyed_atsu	0:63ed631d8c3a	54	*
lynxeyed_atsu	0:63ed631d8c3a	55	* The protocol supports a CRC, but by default it is off (except for the
lynxeyed_atsu	0:63ed631d8c3a	56	* first reset CMD0, where the CRC can just be pre-calculated, and CMD8)
lynxeyed_atsu	0:63ed631d8c3a	57	* I'll leave the CRC off I think!
lynxeyed_atsu	0:63ed631d8c3a	58	*
lynxeyed_atsu	0:63ed631d8c3a	59	* Standard capacity cards have variable data block sizes, whereas High
lynxeyed_atsu	0:63ed631d8c3a	60	* Capacity cards fix the size of data block to 512 bytes. I'll therefore
lynxeyed_atsu	0:63ed631d8c3a	61	* just always use the Standard Capacity cards with a block size of 512 bytes.
lynxeyed_atsu	0:63ed631d8c3a	62	* This is set with CMD16.
lynxeyed_atsu	0:63ed631d8c3a	63	*
lynxeyed_atsu	0:63ed631d8c3a	64	* You can read and write single blocks (CMD17, CMD25) or multiple blocks
lynxeyed_atsu	0:63ed631d8c3a	65	* (CMD18, CMD25). For simplicity, I'll just use single block accesses. When
lynxeyed_atsu	0:63ed631d8c3a	66	* the card gets a read command, it responds with a response token, and then
lynxeyed_atsu	0:63ed631d8c3a	67	* a data token or an error.
lynxeyed_atsu	0:63ed631d8c3a	68	*
lynxeyed_atsu	0:63ed631d8c3a	69	* SPI Command Format
lynxeyed_atsu	0:63ed631d8c3a	70	* ------------------
lynxeyed_atsu	0:63ed631d8c3a	71	* Commands are 6-bytes long, containing the command, 32-bit argument, and CRC.
lynxeyed_atsu	0:63ed631d8c3a	72	*
lynxeyed_atsu	0:63ed631d8c3a	73	* +---------------+------------+------------+-----------+----------+--------------+
lynxeyed_atsu	0:63ed631d8c3a	74	* \| 01 \| cmd[5:0] \| arg[31:24] \| arg[23:16] \| arg[15:8] \| arg[7:0] \| crc[6:0] \| 1 \|
lynxeyed_atsu	0:63ed631d8c3a	75	* +---------------+------------+------------+-----------+----------+--------------+
lynxeyed_atsu	0:63ed631d8c3a	76	*
lynxeyed_atsu	0:63ed631d8c3a	77	* As I'm not using CRC, I can fix that byte to what is needed for CMD0 (0x95)
lynxeyed_atsu	0:63ed631d8c3a	78	*
lynxeyed_atsu	0:63ed631d8c3a	79	* All Application Specific commands shall be preceded with APP_CMD (CMD55).
lynxeyed_atsu	0:63ed631d8c3a	80	*
lynxeyed_atsu	0:63ed631d8c3a	81	* SPI Response Format
lynxeyed_atsu	0:63ed631d8c3a	82	* -------------------
lynxeyed_atsu	0:63ed631d8c3a	83	* The main response format (R1) is a status byte (normally zero). Key flags:
lynxeyed_atsu	0:63ed631d8c3a	84	* idle - 1 if the card is in an idle state/initialising
lynxeyed_atsu	0:63ed631d8c3a	85	* cmd - 1 if an illegal command code was detected
lynxeyed_atsu	0:63ed631d8c3a	86	*
lynxeyed_atsu	0:63ed631d8c3a	87	* +-------------------------------------------------+
lynxeyed_atsu	0:63ed631d8c3a	88	* R1 \| 0 \| arg \| addr \| seq \| crc \| cmd \| erase \| idle \|
lynxeyed_atsu	0:63ed631d8c3a	89	* +-------------------------------------------------+
lynxeyed_atsu	0:63ed631d8c3a	90	*
lynxeyed_atsu	0:63ed631d8c3a	91	* R1b is the same, except it is followed by a busy signal (zeros) until
lynxeyed_atsu	0:63ed631d8c3a	92	* the first non-zero byte when it is ready again.
lynxeyed_atsu	0:63ed631d8c3a	93	*
lynxeyed_atsu	0:63ed631d8c3a	94	* Data Response Token
lynxeyed_atsu	0:63ed631d8c3a	95	* -------------------
lynxeyed_atsu	0:63ed631d8c3a	96	* Every data block written to the card is acknowledged by a byte
lynxeyed_atsu	0:63ed631d8c3a	97	* response token
lynxeyed_atsu	0:63ed631d8c3a	98	*
lynxeyed_atsu	0:63ed631d8c3a	99	* +----------------------+
lynxeyed_atsu	0:63ed631d8c3a	100	* \| xxx \| 0 \| status \| 1 \|
lynxeyed_atsu	0:63ed631d8c3a	101	* +----------------------+
lynxeyed_atsu	0:63ed631d8c3a	102	* 010 - OK!
lynxeyed_atsu	0:63ed631d8c3a	103	* 101 - CRC Error
lynxeyed_atsu	0:63ed631d8c3a	104	* 110 - Write Error
lynxeyed_atsu	0:63ed631d8c3a	105	*
lynxeyed_atsu	0:63ed631d8c3a	106	* Single Block Read and Write
lynxeyed_atsu	0:63ed631d8c3a	107	* ---------------------------
lynxeyed_atsu	0:63ed631d8c3a	108	*
lynxeyed_atsu	0:63ed631d8c3a	109	* Block transfers have a byte header, followed by the data, followed
lynxeyed_atsu	0:63ed631d8c3a	110	* by a 16-bit CRC. In our case, the data will always be 512 bytes.
lynxeyed_atsu	0:63ed631d8c3a	111	*
lynxeyed_atsu	0:63ed631d8c3a	112	* +------+---------+---------+- - - -+---------+-----------+----------+
lynxeyed_atsu	0:63ed631d8c3a	113	* \| 0xFE \| data[0] \| data[1] \| \| data[n] \| crc[15:8] \| crc[7:0] \|
lynxeyed_atsu	0:63ed631d8c3a	114	* +------+---------+---------+- - - -+---------+-----------+----------+
lynxeyed_atsu	0:63ed631d8c3a	115	*/
lynxeyed_atsu	0:63ed631d8c3a	116
lynxeyed_atsu	0:63ed631d8c3a	117	/*
lynxeyed_atsu	0:63ed631d8c3a	118	* Comment: Changes for SDHC support till 32GB
lynxeyed_atsu	0:63ed631d8c3a	119	* Name: KB
lynxeyed_atsu	0:63ed631d8c3a	120	* Date: 07/24/2010
lynxeyed_atsu	0:63ed631d8c3a	121	* Release: 0.1
lynxeyed_atsu	0:63ed631d8c3a	122	*/
lynxeyed_atsu	0:63ed631d8c3a	123
lynxeyed_atsu	0:63ed631d8c3a	124	#include "SDHCFileSystem.h"
lynxeyed_atsu	0:63ed631d8c3a	125
lynxeyed_atsu	0:63ed631d8c3a	126	#define DEBUG
lynxeyed_atsu	0:63ed631d8c3a	127	#define SD_COMMAND_TIMEOUT 5000
lynxeyed_atsu	0:63ed631d8c3a	128
lynxeyed_atsu	0:63ed631d8c3a	129
lynxeyed_atsu	0:63ed631d8c3a	130	SDFileSystem::SDFileSystem(PinName mosi, PinName miso, PinName sclk, PinName cs, const char* name) :
lynxeyed_atsu	0:63ed631d8c3a	131	FATFileSystem(name), _spi(mosi, miso, sclk), _cs(cs) {
lynxeyed_atsu	0:63ed631d8c3a	132	_cs = 1;
lynxeyed_atsu	0:63ed631d8c3a	133	}
lynxeyed_atsu	0:63ed631d8c3a	134
lynxeyed_atsu	0:63ed631d8c3a	135	#define R1_IDLE_STATE (1 << 0)
lynxeyed_atsu	0:63ed631d8c3a	136	#define R1_ERASE_RESET (1 << 1)
lynxeyed_atsu	0:63ed631d8c3a	137	#define R1_ILLEGAL_COMMAND (1 << 2)
lynxeyed_atsu	0:63ed631d8c3a	138	#define R1_COM_CRC_ERROR (1 << 3)
lynxeyed_atsu	0:63ed631d8c3a	139	#define R1_ERASE_SEQUENCE_ERROR (1 << 4)
lynxeyed_atsu	0:63ed631d8c3a	140	#define R1_ADDRESS_ERROR (1 << 5)
lynxeyed_atsu	0:63ed631d8c3a	141	#define R1_PARAMETER_ERROR (1 << 6)
lynxeyed_atsu	0:63ed631d8c3a	142
lynxeyed_atsu	0:63ed631d8c3a	143	// Types
lynxeyed_atsu	0:63ed631d8c3a	144	// - v1.x Standard Capacity
lynxeyed_atsu	0:63ed631d8c3a	145	// - v2.x Standard Capacity
lynxeyed_atsu	0:63ed631d8c3a	146	// - v2.x High Capacity
lynxeyed_atsu	0:63ed631d8c3a	147	// - Not recognised as an SD Card
lynxeyed_atsu	0:63ed631d8c3a	148
lynxeyed_atsu	0:63ed631d8c3a	149	#define SDCARD_FAIL 0
lynxeyed_atsu	0:63ed631d8c3a	150	#define SDCARD_V1 1
lynxeyed_atsu	0:63ed631d8c3a	151	#define SDCARD_V2 2
lynxeyed_atsu	0:63ed631d8c3a	152	#define SDCARD_V2HC 3
lynxeyed_atsu	0:63ed631d8c3a	153
lynxeyed_atsu	0:63ed631d8c3a	154	int SDFileSystem::initialise_card() {
lynxeyed_atsu	0:63ed631d8c3a	155	// Set to 100kHz for initialisation, and clock card with cs = 1
lynxeyed_atsu	0:63ed631d8c3a	156	_spi.frequency(100000);
lynxeyed_atsu	0:63ed631d8c3a	157	_cs = 1;
lynxeyed_atsu	0:63ed631d8c3a	158	for(int i=0; i<16; i++) {
lynxeyed_atsu	0:63ed631d8c3a	159	_spi.write(0xFF);
lynxeyed_atsu	0:63ed631d8c3a	160	}
lynxeyed_atsu	0:63ed631d8c3a	161
lynxeyed_atsu	0:63ed631d8c3a	162	// send CMD0, should return with all zeros except IDLE STATE set (bit 0)
lynxeyed_atsu	0:63ed631d8c3a	163	if(_cmd(0, 0) != R1_IDLE_STATE) {
lynxeyed_atsu	0:63ed631d8c3a	164	fprintf(stderr, "No disk, or could not put SD card in to SPI idle state\n");
lynxeyed_atsu	0:63ed631d8c3a	165	return SDCARD_FAIL;
lynxeyed_atsu	0:63ed631d8c3a	166	}
lynxeyed_atsu	0:63ed631d8c3a	167
lynxeyed_atsu	0:63ed631d8c3a	168	// send CMD8 to determine whther it is ver 2.x
lynxeyed_atsu	0:63ed631d8c3a	169	int r = _cmd8();
lynxeyed_atsu	0:63ed631d8c3a	170	if(r == R1_IDLE_STATE) {
lynxeyed_atsu	0:63ed631d8c3a	171	return initialise_card_v2();
lynxeyed_atsu	0:63ed631d8c3a	172	} else if(r == (R1_IDLE_STATE \| R1_ILLEGAL_COMMAND)) {
lynxeyed_atsu	0:63ed631d8c3a	173	return initialise_card_v1();
lynxeyed_atsu	0:63ed631d8c3a	174	} else {
lynxeyed_atsu	0:63ed631d8c3a	175	fprintf(stderr, "Not in idle state after sending CMD8 (not an SD card?)\n");
lynxeyed_atsu	0:63ed631d8c3a	176	return SDCARD_FAIL;
lynxeyed_atsu	0:63ed631d8c3a	177	}
lynxeyed_atsu	0:63ed631d8c3a	178	}
lynxeyed_atsu	0:63ed631d8c3a	179
lynxeyed_atsu	0:63ed631d8c3a	180	int SDFileSystem::initialise_card_v1() {
lynxeyed_atsu	0:63ed631d8c3a	181	for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
lynxeyed_atsu	0:63ed631d8c3a	182	_cmd(55, 0);
lynxeyed_atsu	0:63ed631d8c3a	183	if(_cmd(41, 0) == 0) {
lynxeyed_atsu	0:63ed631d8c3a	184	cdv = 512;
lynxeyed_atsu	0:63ed631d8c3a	185	#ifdef DEBUG
lynxeyed_atsu	0:63ed631d8c3a	186	printf("\n\rInit: SEDCARD_V1\n\r");
lynxeyed_atsu	0:63ed631d8c3a	187	#endif
lynxeyed_atsu	0:63ed631d8c3a	188	return SDCARD_V1;
lynxeyed_atsu	0:63ed631d8c3a	189	}
lynxeyed_atsu	0:63ed631d8c3a	190	}
lynxeyed_atsu	0:63ed631d8c3a	191
lynxeyed_atsu	0:63ed631d8c3a	192	fprintf(stderr, "Timeout waiting for v1.x card\n");
lynxeyed_atsu	0:63ed631d8c3a	193	return SDCARD_FAIL;
lynxeyed_atsu	0:63ed631d8c3a	194	}
lynxeyed_atsu	0:63ed631d8c3a	195
lynxeyed_atsu	0:63ed631d8c3a	196	int SDFileSystem::initialise_card_v2() {
lynxeyed_atsu	0:63ed631d8c3a	197
lynxeyed_atsu	0:63ed631d8c3a	198	for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
lynxeyed_atsu	0:63ed631d8c3a	199	wait_ms(50);
lynxeyed_atsu	0:63ed631d8c3a	200	_cmd58();
lynxeyed_atsu	0:63ed631d8c3a	201	_cmd(55, 0);
lynxeyed_atsu	0:63ed631d8c3a	202	if(_cmd(41, 0x40000000) == 0) {
lynxeyed_atsu	0:63ed631d8c3a	203	_cmd58();
lynxeyed_atsu	0:63ed631d8c3a	204	#ifdef DEBUG
lynxeyed_atsu	0:63ed631d8c3a	205	printf("\n\rInit: SDCARD_V2\n\r");
lynxeyed_atsu	0:63ed631d8c3a	206	#endif
lynxeyed_atsu	0:63ed631d8c3a	207	cdv = 1;
lynxeyed_atsu	0:63ed631d8c3a	208	return SDCARD_V2;
lynxeyed_atsu	0:63ed631d8c3a	209	}
lynxeyed_atsu	0:63ed631d8c3a	210	}
lynxeyed_atsu	0:63ed631d8c3a	211
lynxeyed_atsu	0:63ed631d8c3a	212	fprintf(stderr, "Timeout waiting for v2.x card\n");
lynxeyed_atsu	0:63ed631d8c3a	213	return SDCARD_FAIL;
lynxeyed_atsu	0:63ed631d8c3a	214	}
lynxeyed_atsu	0:63ed631d8c3a	215
lynxeyed_atsu	0:63ed631d8c3a	216	int SDFileSystem::disk_initialize() {
lynxeyed_atsu	0:63ed631d8c3a	217
lynxeyed_atsu	0:63ed631d8c3a	218	int i = initialise_card();
lynxeyed_atsu	0:63ed631d8c3a	219	#ifdef DEBUG
lynxeyed_atsu	0:63ed631d8c3a	220	printf("init card = %d\n", i);
lynxeyed_atsu	0:63ed631d8c3a	221	#endif
lynxeyed_atsu	0:63ed631d8c3a	222	_sectors = _sd_sectors();
lynxeyed_atsu	0:63ed631d8c3a	223
lynxeyed_atsu	0:63ed631d8c3a	224	// Set block length to 512 (CMD16)
lynxeyed_atsu	0:63ed631d8c3a	225	if(_cmd(16, 512) != 0) {
lynxeyed_atsu	0:63ed631d8c3a	226	fprintf(stderr, "Set 512-byte block timed out\n");
lynxeyed_atsu	0:63ed631d8c3a	227	return 1;
lynxeyed_atsu	0:63ed631d8c3a	228	}
lynxeyed_atsu	0:63ed631d8c3a	229
lynxeyed_atsu	0:63ed631d8c3a	230	_spi.frequency(20000000); // Set to 1MHz for data transfer
lynxeyed_atsu	0:63ed631d8c3a	231	return 0;
lynxeyed_atsu	0:63ed631d8c3a	232	}
lynxeyed_atsu	0:63ed631d8c3a	233
lynxeyed_atsu	0:63ed631d8c3a	234	int SDFileSystem::disk_write(const char *buffer, int block_number) {
lynxeyed_atsu	0:63ed631d8c3a	235	// set write address for single block (CMD24)
lynxeyed_atsu	0:63ed631d8c3a	236	if(_cmd(24, block_number * cdv) != 0) {
lynxeyed_atsu	0:63ed631d8c3a	237	return 1;
lynxeyed_atsu	0:63ed631d8c3a	238	}
lynxeyed_atsu	0:63ed631d8c3a	239
lynxeyed_atsu	0:63ed631d8c3a	240	// send the data block
lynxeyed_atsu	0:63ed631d8c3a	241	_write(buffer, 512);
lynxeyed_atsu	0:63ed631d8c3a	242	return 0;
lynxeyed_atsu	0:63ed631d8c3a	243	}
lynxeyed_atsu	0:63ed631d8c3a	244
lynxeyed_atsu	0:63ed631d8c3a	245	int SDFileSystem::disk_read(char *buffer, int block_number) {
lynxeyed_atsu	0:63ed631d8c3a	246	// set read address for single block (CMD17)
lynxeyed_atsu	0:63ed631d8c3a	247	if(_cmd(17, block_number * cdv) != 0) {
lynxeyed_atsu	0:63ed631d8c3a	248	return 1;
lynxeyed_atsu	0:63ed631d8c3a	249	}
lynxeyed_atsu	0:63ed631d8c3a	250
lynxeyed_atsu	0:63ed631d8c3a	251	// receive the data
lynxeyed_atsu	0:63ed631d8c3a	252	_read(buffer, 512);
lynxeyed_atsu	0:63ed631d8c3a	253	return 0;
lynxeyed_atsu	0:63ed631d8c3a	254	}
lynxeyed_atsu	0:63ed631d8c3a	255
lynxeyed_atsu	0:63ed631d8c3a	256	int SDFileSystem::disk_status() { return 0; }
lynxeyed_atsu	0:63ed631d8c3a	257	int SDFileSystem::disk_sync() { return 0; }
lynxeyed_atsu	0:63ed631d8c3a	258	int SDFileSystem::disk_sectors() { return _sectors; }
lynxeyed_atsu	0:63ed631d8c3a	259
lynxeyed_atsu	0:63ed631d8c3a	260	// PRIVATE FUNCTIONS
lynxeyed_atsu	0:63ed631d8c3a	261
lynxeyed_atsu	0:63ed631d8c3a	262	int SDFileSystem::_cmd(int cmd, int arg) {
lynxeyed_atsu	0:63ed631d8c3a	263	_cs = 0;
lynxeyed_atsu	0:63ed631d8c3a	264
lynxeyed_atsu	0:63ed631d8c3a	265	// send a command
lynxeyed_atsu	0:63ed631d8c3a	266	_spi.write(0x40 \| cmd);
lynxeyed_atsu	0:63ed631d8c3a	267	_spi.write(arg >> 24);
lynxeyed_atsu	0:63ed631d8c3a	268	_spi.write(arg >> 16);
lynxeyed_atsu	0:63ed631d8c3a	269	_spi.write(arg >> 8);
lynxeyed_atsu	0:63ed631d8c3a	270	_spi.write(arg >> 0);
lynxeyed_atsu	0:63ed631d8c3a	271	_spi.write(0x95);
lynxeyed_atsu	0:63ed631d8c3a	272
lynxeyed_atsu	0:63ed631d8c3a	273	// wait for the repsonse (response[7] == 0)
lynxeyed_atsu	0:63ed631d8c3a	274	for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
lynxeyed_atsu	0:63ed631d8c3a	275	int response = _spi.write(0xFF);
lynxeyed_atsu	0:63ed631d8c3a	276	if(!(response & 0x80)) {
lynxeyed_atsu	0:63ed631d8c3a	277	_cs = 1;
lynxeyed_atsu	0:63ed631d8c3a	278	_spi.write(0xFF);
lynxeyed_atsu	0:63ed631d8c3a	279	return response;
lynxeyed_atsu	0:63ed631d8c3a	280	}
lynxeyed_atsu	0:63ed631d8c3a	281	}
lynxeyed_atsu	0:63ed631d8c3a	282	_cs = 1;
lynxeyed_atsu	0:63ed631d8c3a	283	_spi.write(0xFF);
lynxeyed_atsu	0:63ed631d8c3a	284	return -1; // timeout
lynxeyed_atsu	0:63ed631d8c3a	285	}
lynxeyed_atsu	0:63ed631d8c3a	286	int SDFileSystem::_cmdx(int cmd, int arg) {
lynxeyed_atsu	0:63ed631d8c3a	287	_cs = 0;
lynxeyed_atsu	0:63ed631d8c3a	288
lynxeyed_atsu	0:63ed631d8c3a	289	// send a command
lynxeyed_atsu	0:63ed631d8c3a	290	_spi.write(0x40 \| cmd);
lynxeyed_atsu	0:63ed631d8c3a	291	_spi.write(arg >> 24);
lynxeyed_atsu	0:63ed631d8c3a	292	_spi.write(arg >> 16);
lynxeyed_atsu	0:63ed631d8c3a	293	_spi.write(arg >> 8);
lynxeyed_atsu	0:63ed631d8c3a	294	_spi.write(arg >> 0);
lynxeyed_atsu	0:63ed631d8c3a	295	_spi.write(0x95);
lynxeyed_atsu	0:63ed631d8c3a	296
lynxeyed_atsu	0:63ed631d8c3a	297	// wait for the repsonse (response[7] == 0)
lynxeyed_atsu	0:63ed631d8c3a	298	for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
lynxeyed_atsu	0:63ed631d8c3a	299	int response = _spi.write(0xFF);
lynxeyed_atsu	0:63ed631d8c3a	300	if(!(response & 0x80)) {
lynxeyed_atsu	0:63ed631d8c3a	301	return response;
lynxeyed_atsu	0:63ed631d8c3a	302	}
lynxeyed_atsu	0:63ed631d8c3a	303	}
lynxeyed_atsu	0:63ed631d8c3a	304	_cs = 1;
lynxeyed_atsu	0:63ed631d8c3a	305	_spi.write(0xFF);
lynxeyed_atsu	0:63ed631d8c3a	306	return -1; // timeout
lynxeyed_atsu	0:63ed631d8c3a	307	}
lynxeyed_atsu	0:63ed631d8c3a	308
lynxeyed_atsu	0:63ed631d8c3a	309
lynxeyed_atsu	0:63ed631d8c3a	310	int SDFileSystem::_cmd58() {
lynxeyed_atsu	0:63ed631d8c3a	311	_cs = 0;
lynxeyed_atsu	0:63ed631d8c3a	312	int arg = 0;
lynxeyed_atsu	0:63ed631d8c3a	313
lynxeyed_atsu	0:63ed631d8c3a	314	// send a command
lynxeyed_atsu	0:63ed631d8c3a	315	_spi.write(0x40 \| 58);
lynxeyed_atsu	0:63ed631d8c3a	316	_spi.write(arg >> 24);
lynxeyed_atsu	0:63ed631d8c3a	317	_spi.write(arg >> 16);
lynxeyed_atsu	0:63ed631d8c3a	318	_spi.write(arg >> 8);
lynxeyed_atsu	0:63ed631d8c3a	319	_spi.write(arg >> 0);
lynxeyed_atsu	0:63ed631d8c3a	320	_spi.write(0x95);
lynxeyed_atsu	0:63ed631d8c3a	321
lynxeyed_atsu	0:63ed631d8c3a	322	// wait for the repsonse (response[7] == 0)
lynxeyed_atsu	0:63ed631d8c3a	323	for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
lynxeyed_atsu	0:63ed631d8c3a	324	int response = _spi.write(0xFF);
lynxeyed_atsu	0:63ed631d8c3a	325	if(!(response & 0x80)) {
lynxeyed_atsu	0:63ed631d8c3a	326	int ocr = _spi.write(0xFF) << 24;
lynxeyed_atsu	0:63ed631d8c3a	327	ocr \|= _spi.write(0xFF) << 16;
lynxeyed_atsu	0:63ed631d8c3a	328	ocr \|= _spi.write(0xFF) << 8;
lynxeyed_atsu	0:63ed631d8c3a	329	ocr \|= _spi.write(0xFF) << 0;
lynxeyed_atsu	0:63ed631d8c3a	330	// printf("OCR = 0x%08X\n", ocr);
lynxeyed_atsu	0:63ed631d8c3a	331	_cs = 1;
lynxeyed_atsu	0:63ed631d8c3a	332	_spi.write(0xFF);
lynxeyed_atsu	0:63ed631d8c3a	333	return response;
lynxeyed_atsu	0:63ed631d8c3a	334	}
lynxeyed_atsu	0:63ed631d8c3a	335	}
lynxeyed_atsu	0:63ed631d8c3a	336	_cs = 1;
lynxeyed_atsu	0:63ed631d8c3a	337	_spi.write(0xFF);
lynxeyed_atsu	0:63ed631d8c3a	338	return -1; // timeout
lynxeyed_atsu	0:63ed631d8c3a	339	}
lynxeyed_atsu	0:63ed631d8c3a	340
lynxeyed_atsu	0:63ed631d8c3a	341	int SDFileSystem::_cmd8() {
lynxeyed_atsu	0:63ed631d8c3a	342	_cs = 0;
lynxeyed_atsu	0:63ed631d8c3a	343
lynxeyed_atsu	0:63ed631d8c3a	344	// send a command
lynxeyed_atsu	0:63ed631d8c3a	345	_spi.write(0x40 \| 8); // CMD8
lynxeyed_atsu	0:63ed631d8c3a	346	_spi.write(0x00); // reserved
lynxeyed_atsu	0:63ed631d8c3a	347	_spi.write(0x00); // reserved
lynxeyed_atsu	0:63ed631d8c3a	348	_spi.write(0x01); // 3.3v
lynxeyed_atsu	0:63ed631d8c3a	349	_spi.write(0xAA); // check pattern
lynxeyed_atsu	0:63ed631d8c3a	350	_spi.write(0x87); // crc
lynxeyed_atsu	0:63ed631d8c3a	351
lynxeyed_atsu	0:63ed631d8c3a	352	// wait for the repsonse (response[7] == 0)
lynxeyed_atsu	0:63ed631d8c3a	353	for(int i=0; i<SD_COMMAND_TIMEOUT * 1000; i++) {
lynxeyed_atsu	0:63ed631d8c3a	354	char response[5];
lynxeyed_atsu	0:63ed631d8c3a	355	response[0] = _spi.write(0xFF);
lynxeyed_atsu	0:63ed631d8c3a	356	if(!(response[0] & 0x80)) {
lynxeyed_atsu	0:63ed631d8c3a	357	for(int j=1; j<5; j++) {
lynxeyed_atsu	0:63ed631d8c3a	358	response[i] = _spi.write(0xFF);
lynxeyed_atsu	0:63ed631d8c3a	359	}
lynxeyed_atsu	0:63ed631d8c3a	360	_cs = 1;
lynxeyed_atsu	0:63ed631d8c3a	361	_spi.write(0xFF);
lynxeyed_atsu	0:63ed631d8c3a	362	return response[0];
lynxeyed_atsu	0:63ed631d8c3a	363	}
lynxeyed_atsu	0:63ed631d8c3a	364	}
lynxeyed_atsu	0:63ed631d8c3a	365	_cs = 1;
lynxeyed_atsu	0:63ed631d8c3a	366	_spi.write(0xFF);
lynxeyed_atsu	0:63ed631d8c3a	367	return -1; // timeout
lynxeyed_atsu	0:63ed631d8c3a	368	}
lynxeyed_atsu	0:63ed631d8c3a	369
lynxeyed_atsu	0:63ed631d8c3a	370	int SDFileSystem::_read(char *buffer, int length) {
lynxeyed_atsu	0:63ed631d8c3a	371	_cs = 0;
lynxeyed_atsu	0:63ed631d8c3a	372
lynxeyed_atsu	0:63ed631d8c3a	373	// read until start byte (0xFF)
lynxeyed_atsu	0:63ed631d8c3a	374	while(_spi.write(0xFF) != 0xFE);
lynxeyed_atsu	0:63ed631d8c3a	375
lynxeyed_atsu	0:63ed631d8c3a	376	// read data
lynxeyed_atsu	0:63ed631d8c3a	377	for(int i=0; i<length; i++) {
lynxeyed_atsu	0:63ed631d8c3a	378	buffer[i] = _spi.write(0xFF);
lynxeyed_atsu	0:63ed631d8c3a	379	}
lynxeyed_atsu	0:63ed631d8c3a	380	_spi.write(0xFF); // checksum
lynxeyed_atsu	0:63ed631d8c3a	381	_spi.write(0xFF);
lynxeyed_atsu	0:63ed631d8c3a	382
lynxeyed_atsu	0:63ed631d8c3a	383	_cs = 1;
lynxeyed_atsu	0:63ed631d8c3a	384	_spi.write(0xFF);
lynxeyed_atsu	0:63ed631d8c3a	385	return 0;
lynxeyed_atsu	0:63ed631d8c3a	386	}
lynxeyed_atsu	0:63ed631d8c3a	387
lynxeyed_atsu	0:63ed631d8c3a	388	int SDFileSystem::_write(const char *buffer, int length) {
lynxeyed_atsu	0:63ed631d8c3a	389	_cs = 0;
lynxeyed_atsu	0:63ed631d8c3a	390
lynxeyed_atsu	0:63ed631d8c3a	391	// indicate start of block
lynxeyed_atsu	0:63ed631d8c3a	392	_spi.write(0xFE);
lynxeyed_atsu	0:63ed631d8c3a	393
lynxeyed_atsu	0:63ed631d8c3a	394	// write the data
lynxeyed_atsu	0:63ed631d8c3a	395	for(int i=0; i<length; i++) {
lynxeyed_atsu	0:63ed631d8c3a	396	_spi.write(buffer[i]);
lynxeyed_atsu	0:63ed631d8c3a	397	}
lynxeyed_atsu	0:63ed631d8c3a	398
lynxeyed_atsu	0:63ed631d8c3a	399	// write the checksum
lynxeyed_atsu	0:63ed631d8c3a	400	_spi.write(0xFF);
lynxeyed_atsu	0:63ed631d8c3a	401	_spi.write(0xFF);
lynxeyed_atsu	0:63ed631d8c3a	402
lynxeyed_atsu	0:63ed631d8c3a	403	// check the repsonse token
lynxeyed_atsu	0:63ed631d8c3a	404	if((_spi.write(0xFF) & 0x1F) != 0x05) {
lynxeyed_atsu	0:63ed631d8c3a	405	_cs = 1;
lynxeyed_atsu	0:63ed631d8c3a	406	_spi.write(0xFF);
lynxeyed_atsu	0:63ed631d8c3a	407	return 1;
lynxeyed_atsu	0:63ed631d8c3a	408	}
lynxeyed_atsu	0:63ed631d8c3a	409
lynxeyed_atsu	0:63ed631d8c3a	410	// wait for write to finish
lynxeyed_atsu	0:63ed631d8c3a	411	while(_spi.write(0xFF) == 0);
lynxeyed_atsu	0:63ed631d8c3a	412
lynxeyed_atsu	0:63ed631d8c3a	413	_cs = 1;
lynxeyed_atsu	0:63ed631d8c3a	414	_spi.write(0xFF);
lynxeyed_atsu	0:63ed631d8c3a	415	return 0;
lynxeyed_atsu	0:63ed631d8c3a	416	}
lynxeyed_atsu	0:63ed631d8c3a	417
lynxeyed_atsu	0:63ed631d8c3a	418	static int ext_bits(char *data, int msb, int lsb) {
lynxeyed_atsu	0:63ed631d8c3a	419	int bits = 0;
lynxeyed_atsu	0:63ed631d8c3a	420	int size = 1 + msb - lsb;
lynxeyed_atsu	0:63ed631d8c3a	421	for(int i=0; i<size; i++) {
lynxeyed_atsu	0:63ed631d8c3a	422	int position = lsb + i;
lynxeyed_atsu	0:63ed631d8c3a	423	int byte = 15 - (position >> 3);
lynxeyed_atsu	0:63ed631d8c3a	424	int bit = position & 0x7;
lynxeyed_atsu	0:63ed631d8c3a	425	int value = (data[byte] >> bit) & 1;
lynxeyed_atsu	0:63ed631d8c3a	426	bits \|= value << i;
lynxeyed_atsu	0:63ed631d8c3a	427	}
lynxeyed_atsu	0:63ed631d8c3a	428	return bits;
lynxeyed_atsu	0:63ed631d8c3a	429	}
lynxeyed_atsu	0:63ed631d8c3a	430
lynxeyed_atsu	0:63ed631d8c3a	431	int SDFileSystem::_sd_sectors() {
lynxeyed_atsu	0:63ed631d8c3a	432
lynxeyed_atsu	0:63ed631d8c3a	433	int c_size, c_size_mult, read_bl_len;
lynxeyed_atsu	0:63ed631d8c3a	434	int block_len, mult, blocknr, capacity;
lynxeyed_atsu	0:63ed631d8c3a	435	int blocks, hc_c_size;
lynxeyed_atsu	0:63ed631d8c3a	436	uint64_t hc_capacity;
lynxeyed_atsu	0:63ed631d8c3a	437
lynxeyed_atsu	0:63ed631d8c3a	438	// CMD9, Response R2 (R1 byte + 16-byte block read)
lynxeyed_atsu	0:63ed631d8c3a	439	if(_cmdx(9, 0) != 0) {
lynxeyed_atsu	0:63ed631d8c3a	440	fprintf(stderr, "Didn't get a response from the disk\n");
lynxeyed_atsu	0:63ed631d8c3a	441	return 0;
lynxeyed_atsu	0:63ed631d8c3a	442	}
lynxeyed_atsu	0:63ed631d8c3a	443
lynxeyed_atsu	0:63ed631d8c3a	444	char csd[16];
lynxeyed_atsu	0:63ed631d8c3a	445	if(_read(csd, 16) != 0) {
lynxeyed_atsu	0:63ed631d8c3a	446	fprintf(stderr, "Couldn't read csd response from disk\n");
lynxeyed_atsu	0:63ed631d8c3a	447	return 0;
lynxeyed_atsu	0:63ed631d8c3a	448	}
lynxeyed_atsu	0:63ed631d8c3a	449
lynxeyed_atsu	0:63ed631d8c3a	450	// csd_structure : csd[127:126]
lynxeyed_atsu	0:63ed631d8c3a	451	// c_size : csd[73:62]
lynxeyed_atsu	0:63ed631d8c3a	452	// c_size_mult : csd[49:47]
lynxeyed_atsu	0:63ed631d8c3a	453	// read_bl_len : csd[83:80] - the maximum read block length
lynxeyed_atsu	0:63ed631d8c3a	454
lynxeyed_atsu	0:63ed631d8c3a	455	int csd_structure = ext_bits(csd, 127, 126);
lynxeyed_atsu	0:63ed631d8c3a	456
lynxeyed_atsu	0:63ed631d8c3a	457	#ifdef DEBUG
lynxeyed_atsu	0:63ed631d8c3a	458	printf("\n\rCSD_STRUCT = %d\n", csd_structure);
lynxeyed_atsu	0:63ed631d8c3a	459	#endif
lynxeyed_atsu	0:63ed631d8c3a	460
lynxeyed_atsu	0:63ed631d8c3a	461	switch (csd_structure){
lynxeyed_atsu	0:63ed631d8c3a	462	case 0:
lynxeyed_atsu	0:63ed631d8c3a	463	cdv = 512;
lynxeyed_atsu	0:63ed631d8c3a	464	c_size = ext_bits(csd, 73, 62);
lynxeyed_atsu	0:63ed631d8c3a	465	c_size_mult = ext_bits(csd, 49, 47);
lynxeyed_atsu	0:63ed631d8c3a	466	read_bl_len = ext_bits(csd, 83, 80);
lynxeyed_atsu	0:63ed631d8c3a	467
lynxeyed_atsu	0:63ed631d8c3a	468	block_len = 1 << read_bl_len;
lynxeyed_atsu	0:63ed631d8c3a	469	mult = 1 << (c_size_mult + 2);
lynxeyed_atsu	0:63ed631d8c3a	470	blocknr = (c_size + 1) * mult;
lynxeyed_atsu	0:63ed631d8c3a	471	capacity = blocknr * block_len;
lynxeyed_atsu	0:63ed631d8c3a	472	blocks = capacity / 512;
lynxeyed_atsu	0:63ed631d8c3a	473	#ifdef DEBUG
lynxeyed_atsu	0:63ed631d8c3a	474	printf("\n\rSDCard\n\rc_size: %.4X \n\rcapacity: %.ld \n\rsectors: %d\r\n", c_size, capacity, blocks);
lynxeyed_atsu	0:63ed631d8c3a	475	#endif
lynxeyed_atsu	0:63ed631d8c3a	476	break;
lynxeyed_atsu	0:63ed631d8c3a	477
lynxeyed_atsu	0:63ed631d8c3a	478	case 1:
lynxeyed_atsu	0:63ed631d8c3a	479	cdv = 1;
lynxeyed_atsu	0:63ed631d8c3a	480	hc_c_size = ext_bits(csd, 63, 48);
lynxeyed_atsu	0:63ed631d8c3a	481	int hc_read_bl_len = ext_bits(csd, 83, 80);
lynxeyed_atsu	0:63ed631d8c3a	482	hc_capacity = hc_c_size+1;
lynxeyed_atsu	0:63ed631d8c3a	483	blocks = (hc_c_size+1)*1024;
lynxeyed_atsu	0:63ed631d8c3a	484	#ifdef DEBUG
lynxeyed_atsu	0:63ed631d8c3a	485	printf("\n\rSDHC Card \n\rhc_c_size: %.4X \n\rcapacity: %.lld \n\rsectors: %d\r\n", hc_c_size, hc_capacity5121024, blocks);
lynxeyed_atsu	0:63ed631d8c3a	486	#endif
lynxeyed_atsu	0:63ed631d8c3a	487	break;
lynxeyed_atsu	0:63ed631d8c3a	488
lynxeyed_atsu	0:63ed631d8c3a	489	default:
lynxeyed_atsu	0:63ed631d8c3a	490	fprintf(stderr, "This disk tastes funny! I only know about type 0 CSD structures\n");
lynxeyed_atsu	0:63ed631d8c3a	491	return 0;
lynxeyed_atsu	0:63ed631d8c3a	492	//break;
lynxeyed_atsu	0:63ed631d8c3a	493	};
lynxeyed_atsu	0:63ed631d8c3a	494	return blocks;
lynxeyed_atsu	0:63ed631d8c3a	495	}

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	21 Jan 2011
Imports:	2
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	1
Followers:	2

SDHCFileSystem.cpp@0:63ed631d8c3a, 2011-01-21 (annotated)

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