RiceGolombDPCM_Player - For BU9480F D-A Conv.

Users » lynxeyed_atsu » Code » RiceGolombDPCM_Player

xeye_ atsu / Mbed 2 deprecated RiceGolombDPCM_Player

For BU9480F D-A Conv.

SDHCFileSystem.cpp@3:64c3ed0fc4b4, 2010-09-11 (annotated)

Committer:: lynxeyed_atsu
Date:: Sat Sep 11 11:23:26 2010 +0000
Revision:: 3:64c3ed0fc4b4
Parent:: 0:805cffac956b

Who changed what in which revision?

User	Revision	Line number	New contents of line
lynxeyed_atsu	0:805cffac956b	1	/* mbed SDFileSystem Library, for providing file access to SD cards
lynxeyed_atsu	0:805cffac956b	2	* Copyright (c) 2008-2010, sford
lynxeyed_atsu	0:805cffac956b	3	*
lynxeyed_atsu	0:805cffac956b	4	* Permission is hereby granted, free of charge, to any person obtaining a copy
lynxeyed_atsu	0:805cffac956b	5	* of this software and associated documentation files (the "Software"), to deal
lynxeyed_atsu	0:805cffac956b	6	* in the Software without restriction, including without limitation the rights
lynxeyed_atsu	0:805cffac956b	7	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
lynxeyed_atsu	0:805cffac956b	8	* copies of the Software, and to permit persons to whom the Software is
lynxeyed_atsu	0:805cffac956b	9	* furnished to do so, subject to the following conditions:
lynxeyed_atsu	0:805cffac956b	10	*
lynxeyed_atsu	0:805cffac956b	11	* The above copyright notice and this permission notice shall be included in
lynxeyed_atsu	0:805cffac956b	12	* all copies or substantial portions of the Software.
lynxeyed_atsu	0:805cffac956b	13	*
lynxeyed_atsu	0:805cffac956b	14	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
lynxeyed_atsu	0:805cffac956b	15	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
lynxeyed_atsu	0:805cffac956b	16	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
lynxeyed_atsu	0:805cffac956b	17	* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
lynxeyed_atsu	0:805cffac956b	18	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
lynxeyed_atsu	0:805cffac956b	19	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
lynxeyed_atsu	0:805cffac956b	20	* THE SOFTWARE.
lynxeyed_atsu	0:805cffac956b	21	*/
lynxeyed_atsu	0:805cffac956b	22
lynxeyed_atsu	0:805cffac956b	23	/* Introduction
lynxeyed_atsu	0:805cffac956b	24	* ------------
lynxeyed_atsu	0:805cffac956b	25	* SD and MMC cards support a number of interfaces, but common to them all
lynxeyed_atsu	0:805cffac956b	26	* is one based on SPI. This is the one I'm implmenting because it means
lynxeyed_atsu	0:805cffac956b	27	* it is much more portable even though not so performant, and we already
lynxeyed_atsu	0:805cffac956b	28	* have the mbed SPI Interface!
lynxeyed_atsu	0:805cffac956b	29	*
lynxeyed_atsu	0:805cffac956b	30	* The main reference I'm using is Chapter 7, "SPI Mode" of:
lynxeyed_atsu	0:805cffac956b	31	* http://www.sdcard.org/developers/tech/sdcard/pls/Simplified_Physical_Layer_Spec.pdf
lynxeyed_atsu	0:805cffac956b	32	*
lynxeyed_atsu	0:805cffac956b	33	* SPI Startup
lynxeyed_atsu	0:805cffac956b	34	* -----------
lynxeyed_atsu	0:805cffac956b	35	* The SD card powers up in SD mode. The SPI interface mode is selected by
lynxeyed_atsu	0:805cffac956b	36	* asserting CS low and sending the reset command (CMD0). The card will
lynxeyed_atsu	0:805cffac956b	37	* respond with a (R1) response.
lynxeyed_atsu	0:805cffac956b	38	*
lynxeyed_atsu	0:805cffac956b	39	* CMD8 is optionally sent to determine the voltage range supported, and
lynxeyed_atsu	0:805cffac956b	40	* indirectly determine whether it is a version 1.x SD/non-SD card or
lynxeyed_atsu	0:805cffac956b	41	* version 2.x. I'll just ignore this for now.
lynxeyed_atsu	0:805cffac956b	42	*
lynxeyed_atsu	0:805cffac956b	43	* ACMD41 is repeatedly issued to initialise the card, until "in idle"
lynxeyed_atsu	0:805cffac956b	44	* (bit 0) of the R1 response goes to '0', indicating it is initialised.
lynxeyed_atsu	0:805cffac956b	45	*
lynxeyed_atsu	0:805cffac956b	46	* You should also indicate whether the host supports High Capicity cards,
lynxeyed_atsu	0:805cffac956b	47	* and check whether the card is high capacity - i'll also ignore this
lynxeyed_atsu	0:805cffac956b	48	*
lynxeyed_atsu	0:805cffac956b	49	* SPI Protocol
lynxeyed_atsu	0:805cffac956b	50	* ------------
lynxeyed_atsu	0:805cffac956b	51	* The SD SPI protocol is based on transactions made up of 8-bit words, with
lynxeyed_atsu	0:805cffac956b	52	* the host starting every bus transaction by asserting the CS signal low. The
lynxeyed_atsu	0:805cffac956b	53	* card always responds to commands, data blocks and errors.
lynxeyed_atsu	0:805cffac956b	54	*
lynxeyed_atsu	0:805cffac956b	55	* The protocol supports a CRC, but by default it is off (except for the
lynxeyed_atsu	0:805cffac956b	56	* first reset CMD0, where the CRC can just be pre-calculated, and CMD8)
lynxeyed_atsu	0:805cffac956b	57	* I'll leave the CRC off I think!
lynxeyed_atsu	0:805cffac956b	58	*
lynxeyed_atsu	0:805cffac956b	59	* Standard capacity cards have variable data block sizes, whereas High
lynxeyed_atsu	0:805cffac956b	60	* Capacity cards fix the size of data block to 512 bytes. I'll therefore
lynxeyed_atsu	0:805cffac956b	61	* just always use the Standard Capacity cards with a block size of 512 bytes.
lynxeyed_atsu	0:805cffac956b	62	* This is set with CMD16.
lynxeyed_atsu	0:805cffac956b	63	*
lynxeyed_atsu	0:805cffac956b	64	* You can read and write single blocks (CMD17, CMD25) or multiple blocks
lynxeyed_atsu	0:805cffac956b	65	* (CMD18, CMD25). For simplicity, I'll just use single block accesses. When
lynxeyed_atsu	0:805cffac956b	66	* the card gets a read command, it responds with a response token, and then
lynxeyed_atsu	0:805cffac956b	67	* a data token or an error.
lynxeyed_atsu	0:805cffac956b	68	*
lynxeyed_atsu	0:805cffac956b	69	* SPI Command Format
lynxeyed_atsu	0:805cffac956b	70	* ------------------
lynxeyed_atsu	0:805cffac956b	71	* Commands are 6-bytes long, containing the command, 32-bit argument, and CRC.
lynxeyed_atsu	0:805cffac956b	72	*
lynxeyed_atsu	0:805cffac956b	73	* +---------------+------------+------------+-----------+----------+--------------+
lynxeyed_atsu	0:805cffac956b	74	* \| 01 \| cmd[5:0] \| arg[31:24] \| arg[23:16] \| arg[15:8] \| arg[7:0] \| crc[6:0] \| 1 \|
lynxeyed_atsu	0:805cffac956b	75	* +---------------+------------+------------+-----------+----------+--------------+
lynxeyed_atsu	0:805cffac956b	76	*
lynxeyed_atsu	0:805cffac956b	77	* As I'm not using CRC, I can fix that byte to what is needed for CMD0 (0x95)
lynxeyed_atsu	0:805cffac956b	78	*
lynxeyed_atsu	0:805cffac956b	79	* All Application Specific commands shall be preceded with APP_CMD (CMD55).
lynxeyed_atsu	0:805cffac956b	80	*
lynxeyed_atsu	0:805cffac956b	81	* SPI Response Format
lynxeyed_atsu	0:805cffac956b	82	* -------------------
lynxeyed_atsu	0:805cffac956b	83	* The main response format (R1) is a status byte (normally zero). Key flags:
lynxeyed_atsu	0:805cffac956b	84	* idle - 1 if the card is in an idle state/initialising
lynxeyed_atsu	0:805cffac956b	85	* cmd - 1 if an illegal command code was detected
lynxeyed_atsu	0:805cffac956b	86	*
lynxeyed_atsu	0:805cffac956b	87	* +-------------------------------------------------+
lynxeyed_atsu	0:805cffac956b	88	* R1 \| 0 \| arg \| addr \| seq \| crc \| cmd \| erase \| idle \|
lynxeyed_atsu	0:805cffac956b	89	* +-------------------------------------------------+
lynxeyed_atsu	0:805cffac956b	90	*
lynxeyed_atsu	0:805cffac956b	91	* R1b is the same, except it is followed by a busy signal (zeros) until
lynxeyed_atsu	0:805cffac956b	92	* the first non-zero byte when it is ready again.
lynxeyed_atsu	0:805cffac956b	93	*
lynxeyed_atsu	0:805cffac956b	94	* Data Response Token
lynxeyed_atsu	0:805cffac956b	95	* -------------------
lynxeyed_atsu	0:805cffac956b	96	* Every data block written to the card is acknowledged by a byte
lynxeyed_atsu	0:805cffac956b	97	* response token
lynxeyed_atsu	0:805cffac956b	98	*
lynxeyed_atsu	0:805cffac956b	99	* +----------------------+
lynxeyed_atsu	0:805cffac956b	100	* \| xxx \| 0 \| status \| 1 \|
lynxeyed_atsu	0:805cffac956b	101	* +----------------------+
lynxeyed_atsu	0:805cffac956b	102	* 010 - OK!
lynxeyed_atsu	0:805cffac956b	103	* 101 - CRC Error
lynxeyed_atsu	0:805cffac956b	104	* 110 - Write Error
lynxeyed_atsu	0:805cffac956b	105	*
lynxeyed_atsu	0:805cffac956b	106	* Single Block Read and Write
lynxeyed_atsu	0:805cffac956b	107	* ---------------------------
lynxeyed_atsu	0:805cffac956b	108	*
lynxeyed_atsu	0:805cffac956b	109	* Block transfers have a byte header, followed by the data, followed
lynxeyed_atsu	0:805cffac956b	110	* by a 16-bit CRC. In our case, the data will always be 512 bytes.
lynxeyed_atsu	0:805cffac956b	111	*
lynxeyed_atsu	0:805cffac956b	112	* +------+---------+---------+- - - -+---------+-----------+----------+
lynxeyed_atsu	0:805cffac956b	113	* \| 0xFE \| data[0] \| data[1] \| \| data[n] \| crc[15:8] \| crc[7:0] \|
lynxeyed_atsu	0:805cffac956b	114	* +------+---------+---------+- - - -+---------+-----------+----------+
lynxeyed_atsu	0:805cffac956b	115	*/
lynxeyed_atsu	0:805cffac956b	116
lynxeyed_atsu	0:805cffac956b	117	/*
lynxeyed_atsu	0:805cffac956b	118	* Comment: Changes for SDHC support till 32GB
lynxeyed_atsu	0:805cffac956b	119	* Name: KB
lynxeyed_atsu	0:805cffac956b	120	* Date: 07/24/2010
lynxeyed_atsu	0:805cffac956b	121	* Release: 0.1
lynxeyed_atsu	0:805cffac956b	122	*/
lynxeyed_atsu	0:805cffac956b	123
lynxeyed_atsu	0:805cffac956b	124	#include "SDHCFileSystem.h"
lynxeyed_atsu	0:805cffac956b	125
lynxeyed_atsu	0:805cffac956b	126	#define DEBUG
lynxeyed_atsu	0:805cffac956b	127	#define SD_COMMAND_TIMEOUT 5000
lynxeyed_atsu	0:805cffac956b	128
lynxeyed_atsu	0:805cffac956b	129
lynxeyed_atsu	0:805cffac956b	130	SDFileSystem::SDFileSystem(PinName mosi, PinName miso, PinName sclk, PinName cs, const char* name) :
lynxeyed_atsu	0:805cffac956b	131	FATFileSystem(name), _spi(mosi, miso, sclk), _cs(cs) {
lynxeyed_atsu	0:805cffac956b	132	_cs = 1;
lynxeyed_atsu	0:805cffac956b	133	}
lynxeyed_atsu	0:805cffac956b	134
lynxeyed_atsu	0:805cffac956b	135	#define R1_IDLE_STATE (1 << 0)
lynxeyed_atsu	0:805cffac956b	136	#define R1_ERASE_RESET (1 << 1)
lynxeyed_atsu	0:805cffac956b	137	#define R1_ILLEGAL_COMMAND (1 << 2)
lynxeyed_atsu	0:805cffac956b	138	#define R1_COM_CRC_ERROR (1 << 3)
lynxeyed_atsu	0:805cffac956b	139	#define R1_ERASE_SEQUENCE_ERROR (1 << 4)
lynxeyed_atsu	0:805cffac956b	140	#define R1_ADDRESS_ERROR (1 << 5)
lynxeyed_atsu	0:805cffac956b	141	#define R1_PARAMETER_ERROR (1 << 6)
lynxeyed_atsu	0:805cffac956b	142
lynxeyed_atsu	0:805cffac956b	143	// Types
lynxeyed_atsu	0:805cffac956b	144	// - v1.x Standard Capacity
lynxeyed_atsu	0:805cffac956b	145	// - v2.x Standard Capacity
lynxeyed_atsu	0:805cffac956b	146	// - v2.x High Capacity
lynxeyed_atsu	0:805cffac956b	147	// - Not recognised as an SD Card
lynxeyed_atsu	0:805cffac956b	148
lynxeyed_atsu	0:805cffac956b	149	#define SDCARD_FAIL 0
lynxeyed_atsu	0:805cffac956b	150	#define SDCARD_V1 1
lynxeyed_atsu	0:805cffac956b	151	#define SDCARD_V2 2
lynxeyed_atsu	0:805cffac956b	152	#define SDCARD_V2HC 3
lynxeyed_atsu	0:805cffac956b	153
lynxeyed_atsu	0:805cffac956b	154	int SDFileSystem::initialise_card() {
lynxeyed_atsu	0:805cffac956b	155	// Set to 100kHz for initialisation, and clock card with cs = 1
lynxeyed_atsu	0:805cffac956b	156	_spi.frequency(100000);
lynxeyed_atsu	0:805cffac956b	157	_cs = 1;
lynxeyed_atsu	0:805cffac956b	158	for(int i=0; i<16; i++) {
lynxeyed_atsu	0:805cffac956b	159	_spi.write(0xFF);
lynxeyed_atsu	0:805cffac956b	160	}
lynxeyed_atsu	0:805cffac956b	161
lynxeyed_atsu	0:805cffac956b	162	// send CMD0, should return with all zeros except IDLE STATE set (bit 0)
lynxeyed_atsu	0:805cffac956b	163	if(_cmd(0, 0) != R1_IDLE_STATE) {
lynxeyed_atsu	0:805cffac956b	164	fprintf(stderr, "No disk, or could not put SD card in to SPI idle state\n");
lynxeyed_atsu	0:805cffac956b	165	return SDCARD_FAIL;
lynxeyed_atsu	0:805cffac956b	166	}
lynxeyed_atsu	0:805cffac956b	167
lynxeyed_atsu	0:805cffac956b	168	// send CMD8 to determine whther it is ver 2.x
lynxeyed_atsu	0:805cffac956b	169	int r = _cmd8();
lynxeyed_atsu	0:805cffac956b	170	if(r == R1_IDLE_STATE) {
lynxeyed_atsu	0:805cffac956b	171	return initialise_card_v2();
lynxeyed_atsu	0:805cffac956b	172	} else if(r == (R1_IDLE_STATE \| R1_ILLEGAL_COMMAND)) {
lynxeyed_atsu	0:805cffac956b	173	return initialise_card_v1();
lynxeyed_atsu	0:805cffac956b	174	} else {
lynxeyed_atsu	0:805cffac956b	175	fprintf(stderr, "Not in idle state after sending CMD8 (not an SD card?)\n");
lynxeyed_atsu	0:805cffac956b	176	return SDCARD_FAIL;
lynxeyed_atsu	0:805cffac956b	177	}
lynxeyed_atsu	0:805cffac956b	178	}
lynxeyed_atsu	0:805cffac956b	179
lynxeyed_atsu	0:805cffac956b	180	int SDFileSystem::initialise_card_v1() {
lynxeyed_atsu	0:805cffac956b	181	for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
lynxeyed_atsu	0:805cffac956b	182	_cmd(55, 0);
lynxeyed_atsu	0:805cffac956b	183	if(_cmd(41, 0) == 0) {
lynxeyed_atsu	0:805cffac956b	184	cdv = 512;
lynxeyed_atsu	0:805cffac956b	185	#ifdef DEBUG
lynxeyed_atsu	0:805cffac956b	186	printf("\n\rInit: SEDCARD_V1\n\r");
lynxeyed_atsu	0:805cffac956b	187	#endif
lynxeyed_atsu	0:805cffac956b	188	return SDCARD_V1;
lynxeyed_atsu	0:805cffac956b	189	}
lynxeyed_atsu	0:805cffac956b	190	}
lynxeyed_atsu	0:805cffac956b	191
lynxeyed_atsu	0:805cffac956b	192	fprintf(stderr, "Timeout waiting for v1.x card\n");
lynxeyed_atsu	0:805cffac956b	193	return SDCARD_FAIL;
lynxeyed_atsu	0:805cffac956b	194	}
lynxeyed_atsu	0:805cffac956b	195
lynxeyed_atsu	0:805cffac956b	196	int SDFileSystem::initialise_card_v2() {
lynxeyed_atsu	0:805cffac956b	197
lynxeyed_atsu	0:805cffac956b	198	for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
lynxeyed_atsu	0:805cffac956b	199	wait_ms(50);
lynxeyed_atsu	0:805cffac956b	200	_cmd58();
lynxeyed_atsu	0:805cffac956b	201	_cmd(55, 0);
lynxeyed_atsu	0:805cffac956b	202	if(_cmd(41, 0x40000000) == 0) {
lynxeyed_atsu	0:805cffac956b	203	_cmd58();
lynxeyed_atsu	0:805cffac956b	204	#ifdef DEBUG
lynxeyed_atsu	0:805cffac956b	205	printf("\n\rInit: SDCARD_V2\n\r");
lynxeyed_atsu	0:805cffac956b	206	#endif
lynxeyed_atsu	0:805cffac956b	207	cdv = 1;
lynxeyed_atsu	0:805cffac956b	208	return SDCARD_V2;
lynxeyed_atsu	0:805cffac956b	209	}
lynxeyed_atsu	0:805cffac956b	210	}
lynxeyed_atsu	0:805cffac956b	211
lynxeyed_atsu	0:805cffac956b	212	fprintf(stderr, "Timeout waiting for v2.x card\n");
lynxeyed_atsu	0:805cffac956b	213	return SDCARD_FAIL;
lynxeyed_atsu	0:805cffac956b	214	}
lynxeyed_atsu	0:805cffac956b	215
lynxeyed_atsu	0:805cffac956b	216	int SDFileSystem::disk_initialize() {
lynxeyed_atsu	0:805cffac956b	217
lynxeyed_atsu	0:805cffac956b	218	int i = initialise_card();
lynxeyed_atsu	0:805cffac956b	219	#ifdef DEBUG
lynxeyed_atsu	0:805cffac956b	220	printf("init card = %d\n", i);
lynxeyed_atsu	0:805cffac956b	221	#endif
lynxeyed_atsu	0:805cffac956b	222	_sectors = _sd_sectors();
lynxeyed_atsu	0:805cffac956b	223
lynxeyed_atsu	0:805cffac956b	224	// Set block length to 512 (CMD16)
lynxeyed_atsu	0:805cffac956b	225	if(_cmd(16, 512) != 0) {
lynxeyed_atsu	0:805cffac956b	226	fprintf(stderr, "Set 512-byte block timed out\n");
lynxeyed_atsu	0:805cffac956b	227	return 1;
lynxeyed_atsu	0:805cffac956b	228	}
lynxeyed_atsu	0:805cffac956b	229
lynxeyed_atsu	3:64c3ed0fc4b4	230	_spi.frequency(25000000/1000000/); // Set to 1MHz for data transfer
lynxeyed_atsu	0:805cffac956b	231	return 0;
lynxeyed_atsu	0:805cffac956b	232	}
lynxeyed_atsu	0:805cffac956b	233
lynxeyed_atsu	0:805cffac956b	234	int SDFileSystem::disk_write(const char *buffer, int block_number) {
lynxeyed_atsu	0:805cffac956b	235	// set write address for single block (CMD24)
lynxeyed_atsu	0:805cffac956b	236	if(_cmd(24, block_number * cdv) != 0) {
lynxeyed_atsu	0:805cffac956b	237	return 1;
lynxeyed_atsu	0:805cffac956b	238	}
lynxeyed_atsu	0:805cffac956b	239
lynxeyed_atsu	0:805cffac956b	240	// send the data block
lynxeyed_atsu	0:805cffac956b	241	_write(buffer, 512);
lynxeyed_atsu	0:805cffac956b	242	return 0;
lynxeyed_atsu	0:805cffac956b	243	}
lynxeyed_atsu	0:805cffac956b	244
lynxeyed_atsu	0:805cffac956b	245	int SDFileSystem::disk_read(char *buffer, int block_number) {
lynxeyed_atsu	0:805cffac956b	246	// set read address for single block (CMD17)
lynxeyed_atsu	0:805cffac956b	247	if(_cmd(17, block_number * cdv) != 0) {
lynxeyed_atsu	0:805cffac956b	248	return 1;
lynxeyed_atsu	0:805cffac956b	249	}
lynxeyed_atsu	0:805cffac956b	250
lynxeyed_atsu	0:805cffac956b	251	// receive the data
lynxeyed_atsu	0:805cffac956b	252	_read(buffer, 512);
lynxeyed_atsu	0:805cffac956b	253	return 0;
lynxeyed_atsu	0:805cffac956b	254	}
lynxeyed_atsu	0:805cffac956b	255
lynxeyed_atsu	0:805cffac956b	256	int SDFileSystem::disk_status() { return 0; }
lynxeyed_atsu	0:805cffac956b	257	int SDFileSystem::disk_sync() { return 0; }
lynxeyed_atsu	0:805cffac956b	258	int SDFileSystem::disk_sectors() { return _sectors; }
lynxeyed_atsu	0:805cffac956b	259
lynxeyed_atsu	0:805cffac956b	260	// PRIVATE FUNCTIONS
lynxeyed_atsu	0:805cffac956b	261
lynxeyed_atsu	0:805cffac956b	262	int SDFileSystem::_cmd(int cmd, int arg) {
lynxeyed_atsu	0:805cffac956b	263	_cs = 0;
lynxeyed_atsu	0:805cffac956b	264
lynxeyed_atsu	0:805cffac956b	265	// send a command
lynxeyed_atsu	0:805cffac956b	266	_spi.write(0x40 \| cmd);
lynxeyed_atsu	0:805cffac956b	267	_spi.write(arg >> 24);
lynxeyed_atsu	0:805cffac956b	268	_spi.write(arg >> 16);
lynxeyed_atsu	0:805cffac956b	269	_spi.write(arg >> 8);
lynxeyed_atsu	0:805cffac956b	270	_spi.write(arg >> 0);
lynxeyed_atsu	0:805cffac956b	271	_spi.write(0x95);
lynxeyed_atsu	0:805cffac956b	272
lynxeyed_atsu	0:805cffac956b	273	// wait for the repsonse (response[7] == 0)
lynxeyed_atsu	0:805cffac956b	274	for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
lynxeyed_atsu	0:805cffac956b	275	int response = _spi.write(0xFF);
lynxeyed_atsu	0:805cffac956b	276	if(!(response & 0x80)) {
lynxeyed_atsu	0:805cffac956b	277	_cs = 1;
lynxeyed_atsu	0:805cffac956b	278	_spi.write(0xFF);
lynxeyed_atsu	0:805cffac956b	279	return response;
lynxeyed_atsu	0:805cffac956b	280	}
lynxeyed_atsu	0:805cffac956b	281	}
lynxeyed_atsu	0:805cffac956b	282	_cs = 1;
lynxeyed_atsu	0:805cffac956b	283	_spi.write(0xFF);
lynxeyed_atsu	0:805cffac956b	284	return -1; // timeout
lynxeyed_atsu	0:805cffac956b	285	}
lynxeyed_atsu	0:805cffac956b	286	int SDFileSystem::_cmdx(int cmd, int arg) {
lynxeyed_atsu	0:805cffac956b	287	_cs = 0;
lynxeyed_atsu	0:805cffac956b	288
lynxeyed_atsu	0:805cffac956b	289	// send a command
lynxeyed_atsu	0:805cffac956b	290	_spi.write(0x40 \| cmd);
lynxeyed_atsu	0:805cffac956b	291	_spi.write(arg >> 24);
lynxeyed_atsu	0:805cffac956b	292	_spi.write(arg >> 16);
lynxeyed_atsu	0:805cffac956b	293	_spi.write(arg >> 8);
lynxeyed_atsu	0:805cffac956b	294	_spi.write(arg >> 0);
lynxeyed_atsu	0:805cffac956b	295	_spi.write(0x95);
lynxeyed_atsu	0:805cffac956b	296
lynxeyed_atsu	0:805cffac956b	297	// wait for the repsonse (response[7] == 0)
lynxeyed_atsu	0:805cffac956b	298	for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
lynxeyed_atsu	0:805cffac956b	299	int response = _spi.write(0xFF);
lynxeyed_atsu	0:805cffac956b	300	if(!(response & 0x80)) {
lynxeyed_atsu	0:805cffac956b	301	return response;
lynxeyed_atsu	0:805cffac956b	302	}
lynxeyed_atsu	0:805cffac956b	303	}
lynxeyed_atsu	0:805cffac956b	304	_cs = 1;
lynxeyed_atsu	0:805cffac956b	305	_spi.write(0xFF);
lynxeyed_atsu	0:805cffac956b	306	return -1; // timeout
lynxeyed_atsu	0:805cffac956b	307	}
lynxeyed_atsu	0:805cffac956b	308
lynxeyed_atsu	0:805cffac956b	309
lynxeyed_atsu	0:805cffac956b	310	int SDFileSystem::_cmd58() {
lynxeyed_atsu	0:805cffac956b	311	_cs = 0;
lynxeyed_atsu	0:805cffac956b	312	int arg = 0;
lynxeyed_atsu	0:805cffac956b	313
lynxeyed_atsu	0:805cffac956b	314	// send a command
lynxeyed_atsu	0:805cffac956b	315	_spi.write(0x40 \| 58);
lynxeyed_atsu	0:805cffac956b	316	_spi.write(arg >> 24);
lynxeyed_atsu	0:805cffac956b	317	_spi.write(arg >> 16);
lynxeyed_atsu	0:805cffac956b	318	_spi.write(arg >> 8);
lynxeyed_atsu	0:805cffac956b	319	_spi.write(arg >> 0);
lynxeyed_atsu	0:805cffac956b	320	_spi.write(0x95);
lynxeyed_atsu	0:805cffac956b	321
lynxeyed_atsu	0:805cffac956b	322	// wait for the repsonse (response[7] == 0)
lynxeyed_atsu	0:805cffac956b	323	for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
lynxeyed_atsu	0:805cffac956b	324	int response = _spi.write(0xFF);
lynxeyed_atsu	0:805cffac956b	325	if(!(response & 0x80)) {
lynxeyed_atsu	0:805cffac956b	326	int ocr = _spi.write(0xFF) << 24;
lynxeyed_atsu	0:805cffac956b	327	ocr \|= _spi.write(0xFF) << 16;
lynxeyed_atsu	0:805cffac956b	328	ocr \|= _spi.write(0xFF) << 8;
lynxeyed_atsu	0:805cffac956b	329	ocr \|= _spi.write(0xFF) << 0;
lynxeyed_atsu	0:805cffac956b	330	// printf("OCR = 0x%08X\n", ocr);
lynxeyed_atsu	0:805cffac956b	331	_cs = 1;
lynxeyed_atsu	0:805cffac956b	332	_spi.write(0xFF);
lynxeyed_atsu	0:805cffac956b	333	return response;
lynxeyed_atsu	0:805cffac956b	334	}
lynxeyed_atsu	0:805cffac956b	335	}
lynxeyed_atsu	0:805cffac956b	336	_cs = 1;
lynxeyed_atsu	0:805cffac956b	337	_spi.write(0xFF);
lynxeyed_atsu	0:805cffac956b	338	return -1; // timeout
lynxeyed_atsu	0:805cffac956b	339	}
lynxeyed_atsu	0:805cffac956b	340
lynxeyed_atsu	0:805cffac956b	341	int SDFileSystem::_cmd8() {
lynxeyed_atsu	0:805cffac956b	342	_cs = 0;
lynxeyed_atsu	0:805cffac956b	343
lynxeyed_atsu	0:805cffac956b	344	// send a command
lynxeyed_atsu	0:805cffac956b	345	_spi.write(0x40 \| 8); // CMD8
lynxeyed_atsu	0:805cffac956b	346	_spi.write(0x00); // reserved
lynxeyed_atsu	0:805cffac956b	347	_spi.write(0x00); // reserved
lynxeyed_atsu	0:805cffac956b	348	_spi.write(0x01); // 3.3v
lynxeyed_atsu	0:805cffac956b	349	_spi.write(0xAA); // check pattern
lynxeyed_atsu	0:805cffac956b	350	_spi.write(0x87); // crc
lynxeyed_atsu	0:805cffac956b	351
lynxeyed_atsu	0:805cffac956b	352	// wait for the repsonse (response[7] == 0)
lynxeyed_atsu	0:805cffac956b	353	for(int i=0; i<SD_COMMAND_TIMEOUT * 1000; i++) {
lynxeyed_atsu	0:805cffac956b	354	char response[5];
lynxeyed_atsu	0:805cffac956b	355	response[0] = _spi.write(0xFF);
lynxeyed_atsu	0:805cffac956b	356	if(!(response[0] & 0x80)) {
lynxeyed_atsu	0:805cffac956b	357	for(int j=1; j<5; j++) {
lynxeyed_atsu	0:805cffac956b	358	response[i] = _spi.write(0xFF);
lynxeyed_atsu	0:805cffac956b	359	}
lynxeyed_atsu	0:805cffac956b	360	_cs = 1;
lynxeyed_atsu	0:805cffac956b	361	_spi.write(0xFF);
lynxeyed_atsu	0:805cffac956b	362	return response[0];
lynxeyed_atsu	0:805cffac956b	363	}
lynxeyed_atsu	0:805cffac956b	364	}
lynxeyed_atsu	0:805cffac956b	365	_cs = 1;
lynxeyed_atsu	0:805cffac956b	366	_spi.write(0xFF);
lynxeyed_atsu	0:805cffac956b	367	return -1; // timeout
lynxeyed_atsu	0:805cffac956b	368	}
lynxeyed_atsu	0:805cffac956b	369
lynxeyed_atsu	0:805cffac956b	370	int SDFileSystem::_read(char *buffer, int length) {
lynxeyed_atsu	0:805cffac956b	371	_cs = 0;
lynxeyed_atsu	0:805cffac956b	372
lynxeyed_atsu	0:805cffac956b	373	// read until start byte (0xFF)
lynxeyed_atsu	0:805cffac956b	374	while(_spi.write(0xFF) != 0xFE);
lynxeyed_atsu	0:805cffac956b	375
lynxeyed_atsu	0:805cffac956b	376	// read data
lynxeyed_atsu	0:805cffac956b	377	for(int i=0; i<length; i++) {
lynxeyed_atsu	0:805cffac956b	378	buffer[i] = _spi.write(0xFF);
lynxeyed_atsu	0:805cffac956b	379	}
lynxeyed_atsu	0:805cffac956b	380	_spi.write(0xFF); // checksum
lynxeyed_atsu	0:805cffac956b	381	_spi.write(0xFF);
lynxeyed_atsu	0:805cffac956b	382
lynxeyed_atsu	0:805cffac956b	383	_cs = 1;
lynxeyed_atsu	0:805cffac956b	384	_spi.write(0xFF);
lynxeyed_atsu	0:805cffac956b	385	return 0;
lynxeyed_atsu	0:805cffac956b	386	}
lynxeyed_atsu	0:805cffac956b	387
lynxeyed_atsu	0:805cffac956b	388	int SDFileSystem::_write(const char *buffer, int length) {
lynxeyed_atsu	0:805cffac956b	389	_cs = 0;
lynxeyed_atsu	0:805cffac956b	390
lynxeyed_atsu	0:805cffac956b	391	// indicate start of block
lynxeyed_atsu	0:805cffac956b	392	_spi.write(0xFE);
lynxeyed_atsu	0:805cffac956b	393
lynxeyed_atsu	0:805cffac956b	394	// write the data
lynxeyed_atsu	0:805cffac956b	395	for(int i=0; i<length; i++) {
lynxeyed_atsu	0:805cffac956b	396	_spi.write(buffer[i]);
lynxeyed_atsu	0:805cffac956b	397	}
lynxeyed_atsu	0:805cffac956b	398
lynxeyed_atsu	0:805cffac956b	399	// write the checksum
lynxeyed_atsu	0:805cffac956b	400	_spi.write(0xFF);
lynxeyed_atsu	0:805cffac956b	401	_spi.write(0xFF);
lynxeyed_atsu	0:805cffac956b	402
lynxeyed_atsu	0:805cffac956b	403	// check the repsonse token
lynxeyed_atsu	0:805cffac956b	404	if((_spi.write(0xFF) & 0x1F) != 0x05) {
lynxeyed_atsu	0:805cffac956b	405	_cs = 1;
lynxeyed_atsu	0:805cffac956b	406	_spi.write(0xFF);
lynxeyed_atsu	0:805cffac956b	407	return 1;
lynxeyed_atsu	0:805cffac956b	408	}
lynxeyed_atsu	0:805cffac956b	409
lynxeyed_atsu	0:805cffac956b	410	// wait for write to finish
lynxeyed_atsu	0:805cffac956b	411	while(_spi.write(0xFF) == 0);
lynxeyed_atsu	0:805cffac956b	412
lynxeyed_atsu	0:805cffac956b	413	_cs = 1;
lynxeyed_atsu	0:805cffac956b	414	_spi.write(0xFF);
lynxeyed_atsu	0:805cffac956b	415	return 0;
lynxeyed_atsu	0:805cffac956b	416	}
lynxeyed_atsu	0:805cffac956b	417
lynxeyed_atsu	0:805cffac956b	418	static int ext_bits(char *data, int msb, int lsb) {
lynxeyed_atsu	0:805cffac956b	419	int bits = 0;
lynxeyed_atsu	0:805cffac956b	420	int size = 1 + msb - lsb;
lynxeyed_atsu	0:805cffac956b	421	for(int i=0; i<size; i++) {
lynxeyed_atsu	0:805cffac956b	422	int position = lsb + i;
lynxeyed_atsu	0:805cffac956b	423	int byte = 15 - (position >> 3);
lynxeyed_atsu	0:805cffac956b	424	int bit = position & 0x7;
lynxeyed_atsu	0:805cffac956b	425	int value = (data[byte] >> bit) & 1;
lynxeyed_atsu	0:805cffac956b	426	bits \|= value << i;
lynxeyed_atsu	0:805cffac956b	427	}
lynxeyed_atsu	0:805cffac956b	428	return bits;
lynxeyed_atsu	0:805cffac956b	429	}
lynxeyed_atsu	0:805cffac956b	430
lynxeyed_atsu	0:805cffac956b	431	int SDFileSystem::_sd_sectors() {
lynxeyed_atsu	0:805cffac956b	432
lynxeyed_atsu	0:805cffac956b	433	int c_size, c_size_mult, read_bl_len;
lynxeyed_atsu	0:805cffac956b	434	int block_len, mult, blocknr, capacity;
lynxeyed_atsu	0:805cffac956b	435	int blocks, hc_c_size;
lynxeyed_atsu	0:805cffac956b	436	uint64_t hc_capacity;
lynxeyed_atsu	0:805cffac956b	437
lynxeyed_atsu	0:805cffac956b	438	// CMD9, Response R2 (R1 byte + 16-byte block read)
lynxeyed_atsu	0:805cffac956b	439	if(_cmdx(9, 0) != 0) {
lynxeyed_atsu	0:805cffac956b	440	fprintf(stderr, "Didn't get a response from the disk\n");
lynxeyed_atsu	0:805cffac956b	441	return 0;
lynxeyed_atsu	0:805cffac956b	442	}
lynxeyed_atsu	0:805cffac956b	443
lynxeyed_atsu	0:805cffac956b	444	char csd[16];
lynxeyed_atsu	0:805cffac956b	445	if(_read(csd, 16) != 0) {
lynxeyed_atsu	0:805cffac956b	446	fprintf(stderr, "Couldn't read csd response from disk\n");
lynxeyed_atsu	0:805cffac956b	447	return 0;
lynxeyed_atsu	0:805cffac956b	448	}
lynxeyed_atsu	0:805cffac956b	449
lynxeyed_atsu	0:805cffac956b	450	// csd_structure : csd[127:126]
lynxeyed_atsu	0:805cffac956b	451	// c_size : csd[73:62]
lynxeyed_atsu	0:805cffac956b	452	// c_size_mult : csd[49:47]
lynxeyed_atsu	0:805cffac956b	453	// read_bl_len : csd[83:80] - the maximum read block length
lynxeyed_atsu	0:805cffac956b	454
lynxeyed_atsu	0:805cffac956b	455	int csd_structure = ext_bits(csd, 127, 126);
lynxeyed_atsu	0:805cffac956b	456
lynxeyed_atsu	0:805cffac956b	457	#ifdef DEBUG
lynxeyed_atsu	0:805cffac956b	458	printf("\n\rCSD_STRUCT = %d\n", csd_structure);
lynxeyed_atsu	0:805cffac956b	459	#endif
lynxeyed_atsu	0:805cffac956b	460
lynxeyed_atsu	0:805cffac956b	461	switch (csd_structure){
lynxeyed_atsu	0:805cffac956b	462	case 0:
lynxeyed_atsu	0:805cffac956b	463	cdv = 512;
lynxeyed_atsu	0:805cffac956b	464	c_size = ext_bits(csd, 73, 62);
lynxeyed_atsu	0:805cffac956b	465	c_size_mult = ext_bits(csd, 49, 47);
lynxeyed_atsu	0:805cffac956b	466	read_bl_len = ext_bits(csd, 83, 80);
lynxeyed_atsu	0:805cffac956b	467	block_len = 1 << read_bl_len;
lynxeyed_atsu	0:805cffac956b	468	mult = 1 << (c_size_mult + 2);
lynxeyed_atsu	0:805cffac956b	469	blocknr = (c_size + 1) * mult;
lynxeyed_atsu	0:805cffac956b	470	capacity = blocknr * block_len;
lynxeyed_atsu	0:805cffac956b	471	blocks = capacity / 512;
lynxeyed_atsu	0:805cffac956b	472	#ifdef DEBUG
lynxeyed_atsu	0:805cffac956b	473	printf("\n\rSDCard\n\rc_size: %.4X \n\rcapacity: %.ld \n\rsectors: %d\n\r", c_size, capacity, blocks);
lynxeyed_atsu	0:805cffac956b	474	#endif
lynxeyed_atsu	0:805cffac956b	475	break;
lynxeyed_atsu	0:805cffac956b	476
lynxeyed_atsu	0:805cffac956b	477	case 1:
lynxeyed_atsu	0:805cffac956b	478	cdv = 1;
lynxeyed_atsu	0:805cffac956b	479	hc_c_size = ext_bits(csd, 63, 48);
lynxeyed_atsu	0:805cffac956b	480	int hc_read_bl_len = ext_bits(csd, 83, 80);
lynxeyed_atsu	0:805cffac956b	481	hc_capacity = hc_c_size+1;
lynxeyed_atsu	0:805cffac956b	482	blocks = (hc_c_size+1)*1024;
lynxeyed_atsu	0:805cffac956b	483	#ifdef DEBUG
lynxeyed_atsu	0:805cffac956b	484	printf("\n\rSDHC Card \n\rhc_c_size: %.4X \n\rcapacity: %.lld \n\rsectors: %d\n\r", hc_c_size, hc_capacity5121024, blocks);
lynxeyed_atsu	0:805cffac956b	485	#endif
lynxeyed_atsu	0:805cffac956b	486	break;
lynxeyed_atsu	0:805cffac956b	487
lynxeyed_atsu	0:805cffac956b	488	default:
lynxeyed_atsu	0:805cffac956b	489	fprintf(stderr, "This disk tastes funny! I only know about type 0 CSD structures\n");
lynxeyed_atsu	0:805cffac956b	490	return 0;
lynxeyed_atsu	0:805cffac956b	491	//break;
lynxeyed_atsu	0:805cffac956b	492	};
lynxeyed_atsu	0:805cffac956b	493	return blocks;
lynxeyed_atsu	0:805cffac956b	494	}

Repository toolbox

Export to desktop IDE

Build repository

Repository details

Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	26 Aug 2010
Imports:	9
Forks:	0
Commits:	4
Dependents:	0
Dependencies:	1
Followers:	1

SDHCFileSystem.cpp@3:64c3ed0fc4b4, 2010-09-11 (annotated)

Who changed what in which revision?

Repository toolbox

Repository details

Important Information for this Arm website

Access Warning