EA_DownloadToSD - Test of Embedded Artists LPCXpresso baseboard SD …

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Tom Coxon / Mbed 2 deprecated EA_DownloadToSD

Test of Embedded Artists LPCXpresso baseboard SD card and ethernet facilities. This program downloads files from a website to the SD card. This program now uses the HTTPClient from: http://mbed.org/users/donatien/programs/HTTPClient/latest which downloads the files without errors. The previous version of this program was used to demonstrate that an earlier HTTPClient downloaded files with errors.

Dependencies: EthernetNetIf mbed

SDHCFileSystem.cpp@1:0734a7b0fd5e, 2010-08-13 (annotated)

Committer:: tom_coxon
Date:: Fri Aug 13 14:45:50 2010 +0000
Revision:: 1:0734a7b0fd5e

Who changed what in which revision?

User	Revision	Line number	New contents of line
tom_coxon	1:0734a7b0fd5e	1	/* mbed SDFileSystem Library, for providing file access to SD cards
tom_coxon	1:0734a7b0fd5e	2	* Copyright (c) 2008-2010, sford
tom_coxon	1:0734a7b0fd5e	3	*
tom_coxon	1:0734a7b0fd5e	4	* Permission is hereby granted, free of charge, to any person obtaining a copy
tom_coxon	1:0734a7b0fd5e	5	* of this software and associated documentation files (the "Software"), to deal
tom_coxon	1:0734a7b0fd5e	6	* in the Software without restriction, including without limitation the rights
tom_coxon	1:0734a7b0fd5e	7	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
tom_coxon	1:0734a7b0fd5e	8	* copies of the Software, and to permit persons to whom the Software is
tom_coxon	1:0734a7b0fd5e	9	* furnished to do so, subject to the following conditions:
tom_coxon	1:0734a7b0fd5e	10	*
tom_coxon	1:0734a7b0fd5e	11	* The above copyright notice and this permission notice shall be included in
tom_coxon	1:0734a7b0fd5e	12	* all copies or substantial portions of the Software.
tom_coxon	1:0734a7b0fd5e	13	*
tom_coxon	1:0734a7b0fd5e	14	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
tom_coxon	1:0734a7b0fd5e	15	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
tom_coxon	1:0734a7b0fd5e	16	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
tom_coxon	1:0734a7b0fd5e	17	* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
tom_coxon	1:0734a7b0fd5e	18	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
tom_coxon	1:0734a7b0fd5e	19	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
tom_coxon	1:0734a7b0fd5e	20	* THE SOFTWARE.
tom_coxon	1:0734a7b0fd5e	21	*/
tom_coxon	1:0734a7b0fd5e	22
tom_coxon	1:0734a7b0fd5e	23	/* Introduction
tom_coxon	1:0734a7b0fd5e	24	* ------------
tom_coxon	1:0734a7b0fd5e	25	* SD and MMC cards support a number of interfaces, but common to them all
tom_coxon	1:0734a7b0fd5e	26	* is one based on SPI. This is the one I'm implmenting because it means
tom_coxon	1:0734a7b0fd5e	27	* it is much more portable even though not so performant, and we already
tom_coxon	1:0734a7b0fd5e	28	* have the mbed SPI Interface!
tom_coxon	1:0734a7b0fd5e	29	*
tom_coxon	1:0734a7b0fd5e	30	* The main reference I'm using is Chapter 7, "SPI Mode" of:
tom_coxon	1:0734a7b0fd5e	31	* http://www.sdcard.org/developers/tech/sdcard/pls/Simplified_Physical_Layer_Spec.pdf
tom_coxon	1:0734a7b0fd5e	32	*
tom_coxon	1:0734a7b0fd5e	33	* SPI Startup
tom_coxon	1:0734a7b0fd5e	34	* -----------
tom_coxon	1:0734a7b0fd5e	35	* The SD card powers up in SD mode. The SPI interface mode is selected by
tom_coxon	1:0734a7b0fd5e	36	* asserting CS low and sending the reset command (CMD0). The card will
tom_coxon	1:0734a7b0fd5e	37	* respond with a (R1) response.
tom_coxon	1:0734a7b0fd5e	38	*
tom_coxon	1:0734a7b0fd5e	39	* CMD8 is optionally sent to determine the voltage range supported, and
tom_coxon	1:0734a7b0fd5e	40	* indirectly determine whether it is a version 1.x SD/non-SD card or
tom_coxon	1:0734a7b0fd5e	41	* version 2.x. I'll just ignore this for now.
tom_coxon	1:0734a7b0fd5e	42	*
tom_coxon	1:0734a7b0fd5e	43	* ACMD41 is repeatedly issued to initialise the card, until "in idle"
tom_coxon	1:0734a7b0fd5e	44	* (bit 0) of the R1 response goes to '0', indicating it is initialised.
tom_coxon	1:0734a7b0fd5e	45	*
tom_coxon	1:0734a7b0fd5e	46	* You should also indicate whether the host supports High Capicity cards,
tom_coxon	1:0734a7b0fd5e	47	* and check whether the card is high capacity - i'll also ignore this
tom_coxon	1:0734a7b0fd5e	48	*
tom_coxon	1:0734a7b0fd5e	49	* SPI Protocol
tom_coxon	1:0734a7b0fd5e	50	* ------------
tom_coxon	1:0734a7b0fd5e	51	* The SD SPI protocol is based on transactions made up of 8-bit words, with
tom_coxon	1:0734a7b0fd5e	52	* the host starting every bus transaction by asserting the CS signal low. The
tom_coxon	1:0734a7b0fd5e	53	* card always responds to commands, data blocks and errors.
tom_coxon	1:0734a7b0fd5e	54	*
tom_coxon	1:0734a7b0fd5e	55	* The protocol supports a CRC, but by default it is off (except for the
tom_coxon	1:0734a7b0fd5e	56	* first reset CMD0, where the CRC can just be pre-calculated, and CMD8)
tom_coxon	1:0734a7b0fd5e	57	* I'll leave the CRC off I think!
tom_coxon	1:0734a7b0fd5e	58	*
tom_coxon	1:0734a7b0fd5e	59	* Standard capacity cards have variable data block sizes, whereas High
tom_coxon	1:0734a7b0fd5e	60	* Capacity cards fix the size of data block to 512 bytes. I'll therefore
tom_coxon	1:0734a7b0fd5e	61	* just always use the Standard Capacity cards with a block size of 512 bytes.
tom_coxon	1:0734a7b0fd5e	62	* This is set with CMD16.
tom_coxon	1:0734a7b0fd5e	63	*
tom_coxon	1:0734a7b0fd5e	64	* You can read and write single blocks (CMD17, CMD25) or multiple blocks
tom_coxon	1:0734a7b0fd5e	65	* (CMD18, CMD25). For simplicity, I'll just use single block accesses. When
tom_coxon	1:0734a7b0fd5e	66	* the card gets a read command, it responds with a response token, and then
tom_coxon	1:0734a7b0fd5e	67	* a data token or an error.
tom_coxon	1:0734a7b0fd5e	68	*
tom_coxon	1:0734a7b0fd5e	69	* SPI Command Format
tom_coxon	1:0734a7b0fd5e	70	* ------------------
tom_coxon	1:0734a7b0fd5e	71	* Commands are 6-bytes long, containing the command, 32-bit argument, and CRC.
tom_coxon	1:0734a7b0fd5e	72	*
tom_coxon	1:0734a7b0fd5e	73	* +---------------+------------+------------+-----------+----------+--------------+
tom_coxon	1:0734a7b0fd5e	74	* \| 01 \| cmd[5:0] \| arg[31:24] \| arg[23:16] \| arg[15:8] \| arg[7:0] \| crc[6:0] \| 1 \|
tom_coxon	1:0734a7b0fd5e	75	* +---------------+------------+------------+-----------+----------+--------------+
tom_coxon	1:0734a7b0fd5e	76	*
tom_coxon	1:0734a7b0fd5e	77	* As I'm not using CRC, I can fix that byte to what is needed for CMD0 (0x95)
tom_coxon	1:0734a7b0fd5e	78	*
tom_coxon	1:0734a7b0fd5e	79	* All Application Specific commands shall be preceded with APP_CMD (CMD55).
tom_coxon	1:0734a7b0fd5e	80	*
tom_coxon	1:0734a7b0fd5e	81	* SPI Response Format
tom_coxon	1:0734a7b0fd5e	82	* -------------------
tom_coxon	1:0734a7b0fd5e	83	* The main response format (R1) is a status byte (normally zero). Key flags:
tom_coxon	1:0734a7b0fd5e	84	* idle - 1 if the card is in an idle state/initialising
tom_coxon	1:0734a7b0fd5e	85	* cmd - 1 if an illegal command code was detected
tom_coxon	1:0734a7b0fd5e	86	*
tom_coxon	1:0734a7b0fd5e	87	* +-------------------------------------------------+
tom_coxon	1:0734a7b0fd5e	88	* R1 \| 0 \| arg \| addr \| seq \| crc \| cmd \| erase \| idle \|
tom_coxon	1:0734a7b0fd5e	89	* +-------------------------------------------------+
tom_coxon	1:0734a7b0fd5e	90	*
tom_coxon	1:0734a7b0fd5e	91	* R1b is the same, except it is followed by a busy signal (zeros) until
tom_coxon	1:0734a7b0fd5e	92	* the first non-zero byte when it is ready again.
tom_coxon	1:0734a7b0fd5e	93	*
tom_coxon	1:0734a7b0fd5e	94	* Data Response Token
tom_coxon	1:0734a7b0fd5e	95	* -------------------
tom_coxon	1:0734a7b0fd5e	96	* Every data block written to the card is acknowledged by a byte
tom_coxon	1:0734a7b0fd5e	97	* response token
tom_coxon	1:0734a7b0fd5e	98	*
tom_coxon	1:0734a7b0fd5e	99	* +----------------------+
tom_coxon	1:0734a7b0fd5e	100	* \| xxx \| 0 \| status \| 1 \|
tom_coxon	1:0734a7b0fd5e	101	* +----------------------+
tom_coxon	1:0734a7b0fd5e	102	* 010 - OK!
tom_coxon	1:0734a7b0fd5e	103	* 101 - CRC Error
tom_coxon	1:0734a7b0fd5e	104	* 110 - Write Error
tom_coxon	1:0734a7b0fd5e	105	*
tom_coxon	1:0734a7b0fd5e	106	* Single Block Read and Write
tom_coxon	1:0734a7b0fd5e	107	* ---------------------------
tom_coxon	1:0734a7b0fd5e	108	*
tom_coxon	1:0734a7b0fd5e	109	* Block transfers have a byte header, followed by the data, followed
tom_coxon	1:0734a7b0fd5e	110	* by a 16-bit CRC. In our case, the data will always be 512 bytes.
tom_coxon	1:0734a7b0fd5e	111	*
tom_coxon	1:0734a7b0fd5e	112	* +------+---------+---------+- - - -+---------+-----------+----------+
tom_coxon	1:0734a7b0fd5e	113	* \| 0xFE \| data[0] \| data[1] \| \| data[n] \| crc[15:8] \| crc[7:0] \|
tom_coxon	1:0734a7b0fd5e	114	* +------+---------+---------+- - - -+---------+-----------+----------+
tom_coxon	1:0734a7b0fd5e	115	*/
tom_coxon	1:0734a7b0fd5e	116
tom_coxon	1:0734a7b0fd5e	117	/*
tom_coxon	1:0734a7b0fd5e	118	* Comment: Changes for SDHC support till 32GB
tom_coxon	1:0734a7b0fd5e	119	* Name: KB
tom_coxon	1:0734a7b0fd5e	120	* Date: 07/24/2010
tom_coxon	1:0734a7b0fd5e	121	* Release: 0.1
tom_coxon	1:0734a7b0fd5e	122	*/
tom_coxon	1:0734a7b0fd5e	123
tom_coxon	1:0734a7b0fd5e	124	#include "SDHCFileSystem.h"
tom_coxon	1:0734a7b0fd5e	125
tom_coxon	1:0734a7b0fd5e	126	#define DEBUG
tom_coxon	1:0734a7b0fd5e	127	#define SD_COMMAND_TIMEOUT 5000
tom_coxon	1:0734a7b0fd5e	128
tom_coxon	1:0734a7b0fd5e	129
tom_coxon	1:0734a7b0fd5e	130	SDFileSystem::SDFileSystem(PinName mosi, PinName miso, PinName sclk, PinName cs, const char* name) :
tom_coxon	1:0734a7b0fd5e	131	FATFileSystem(name), _spi(mosi, miso, sclk), _cs(cs) {
tom_coxon	1:0734a7b0fd5e	132	_cs = 1;
tom_coxon	1:0734a7b0fd5e	133	}
tom_coxon	1:0734a7b0fd5e	134
tom_coxon	1:0734a7b0fd5e	135	#define R1_IDLE_STATE (1 << 0)
tom_coxon	1:0734a7b0fd5e	136	#define R1_ERASE_RESET (1 << 1)
tom_coxon	1:0734a7b0fd5e	137	#define R1_ILLEGAL_COMMAND (1 << 2)
tom_coxon	1:0734a7b0fd5e	138	#define R1_COM_CRC_ERROR (1 << 3)
tom_coxon	1:0734a7b0fd5e	139	#define R1_ERASE_SEQUENCE_ERROR (1 << 4)
tom_coxon	1:0734a7b0fd5e	140	#define R1_ADDRESS_ERROR (1 << 5)
tom_coxon	1:0734a7b0fd5e	141	#define R1_PARAMETER_ERROR (1 << 6)
tom_coxon	1:0734a7b0fd5e	142
tom_coxon	1:0734a7b0fd5e	143	// Types
tom_coxon	1:0734a7b0fd5e	144	// - v1.x Standard Capacity
tom_coxon	1:0734a7b0fd5e	145	// - v2.x Standard Capacity
tom_coxon	1:0734a7b0fd5e	146	// - v2.x High Capacity
tom_coxon	1:0734a7b0fd5e	147	// - Not recognised as an SD Card
tom_coxon	1:0734a7b0fd5e	148
tom_coxon	1:0734a7b0fd5e	149	#define SDCARD_FAIL 0
tom_coxon	1:0734a7b0fd5e	150	#define SDCARD_V1 1
tom_coxon	1:0734a7b0fd5e	151	#define SDCARD_V2 2
tom_coxon	1:0734a7b0fd5e	152	#define SDCARD_V2HC 3
tom_coxon	1:0734a7b0fd5e	153
tom_coxon	1:0734a7b0fd5e	154	int SDFileSystem::initialise_card() {
tom_coxon	1:0734a7b0fd5e	155	// Set to 100kHz for initialisation, and clock card with cs = 1
tom_coxon	1:0734a7b0fd5e	156	_spi.frequency(100000);
tom_coxon	1:0734a7b0fd5e	157	_cs = 1;
tom_coxon	1:0734a7b0fd5e	158	for(int i=0; i<16; i++) {
tom_coxon	1:0734a7b0fd5e	159	_spi.write(0xFF);
tom_coxon	1:0734a7b0fd5e	160	}
tom_coxon	1:0734a7b0fd5e	161
tom_coxon	1:0734a7b0fd5e	162	// send CMD0, should return with all zeros except IDLE STATE set (bit 0)
tom_coxon	1:0734a7b0fd5e	163	if(_cmd(0, 0) != R1_IDLE_STATE) {
tom_coxon	1:0734a7b0fd5e	164	fprintf(stderr, "No disk, or could not put SD card in to SPI idle state\n");
tom_coxon	1:0734a7b0fd5e	165	return SDCARD_FAIL;
tom_coxon	1:0734a7b0fd5e	166	}
tom_coxon	1:0734a7b0fd5e	167
tom_coxon	1:0734a7b0fd5e	168	// send CMD8 to determine whther it is ver 2.x
tom_coxon	1:0734a7b0fd5e	169	int r = _cmd8();
tom_coxon	1:0734a7b0fd5e	170	if(r == R1_IDLE_STATE) {
tom_coxon	1:0734a7b0fd5e	171	return initialise_card_v2();
tom_coxon	1:0734a7b0fd5e	172	} else if(r == (R1_IDLE_STATE \| R1_ILLEGAL_COMMAND)) {
tom_coxon	1:0734a7b0fd5e	173	return initialise_card_v1();
tom_coxon	1:0734a7b0fd5e	174	} else {
tom_coxon	1:0734a7b0fd5e	175	fprintf(stderr, "Not in idle state after sending CMD8 (not an SD card?)\n");
tom_coxon	1:0734a7b0fd5e	176	return SDCARD_FAIL;
tom_coxon	1:0734a7b0fd5e	177	}
tom_coxon	1:0734a7b0fd5e	178	}
tom_coxon	1:0734a7b0fd5e	179
tom_coxon	1:0734a7b0fd5e	180	int SDFileSystem::initialise_card_v1() {
tom_coxon	1:0734a7b0fd5e	181	for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
tom_coxon	1:0734a7b0fd5e	182	_cmd(55, 0);
tom_coxon	1:0734a7b0fd5e	183	if(_cmd(41, 0) == 0) {
tom_coxon	1:0734a7b0fd5e	184	cdv = 512;
tom_coxon	1:0734a7b0fd5e	185	#ifdef DEBUG
tom_coxon	1:0734a7b0fd5e	186	printf("\n\rInit: SEDCARD_V1\n\r");
tom_coxon	1:0734a7b0fd5e	187	#endif
tom_coxon	1:0734a7b0fd5e	188	return SDCARD_V1;
tom_coxon	1:0734a7b0fd5e	189	}
tom_coxon	1:0734a7b0fd5e	190	}
tom_coxon	1:0734a7b0fd5e	191
tom_coxon	1:0734a7b0fd5e	192	fprintf(stderr, "Timeout waiting for v1.x card\n");
tom_coxon	1:0734a7b0fd5e	193	return SDCARD_FAIL;
tom_coxon	1:0734a7b0fd5e	194	}
tom_coxon	1:0734a7b0fd5e	195
tom_coxon	1:0734a7b0fd5e	196	int SDFileSystem::initialise_card_v2() {
tom_coxon	1:0734a7b0fd5e	197
tom_coxon	1:0734a7b0fd5e	198	for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
tom_coxon	1:0734a7b0fd5e	199	wait_ms(50);
tom_coxon	1:0734a7b0fd5e	200	_cmd58();
tom_coxon	1:0734a7b0fd5e	201	_cmd(55, 0);
tom_coxon	1:0734a7b0fd5e	202	if(_cmd(41, 0x40000000) == 0) {
tom_coxon	1:0734a7b0fd5e	203	_cmd58();
tom_coxon	1:0734a7b0fd5e	204	#ifdef DEBUG
tom_coxon	1:0734a7b0fd5e	205	printf("\n\rInit: SDCARD_V2\n\r");
tom_coxon	1:0734a7b0fd5e	206	#endif
tom_coxon	1:0734a7b0fd5e	207	cdv = 1;
tom_coxon	1:0734a7b0fd5e	208	return SDCARD_V2;
tom_coxon	1:0734a7b0fd5e	209	}
tom_coxon	1:0734a7b0fd5e	210	}
tom_coxon	1:0734a7b0fd5e	211
tom_coxon	1:0734a7b0fd5e	212	fprintf(stderr, "Timeout waiting for v2.x card\n");
tom_coxon	1:0734a7b0fd5e	213	return SDCARD_FAIL;
tom_coxon	1:0734a7b0fd5e	214	}
tom_coxon	1:0734a7b0fd5e	215
tom_coxon	1:0734a7b0fd5e	216	int SDFileSystem::disk_initialize() {
tom_coxon	1:0734a7b0fd5e	217
tom_coxon	1:0734a7b0fd5e	218	int i = initialise_card();
tom_coxon	1:0734a7b0fd5e	219	#ifdef DEBUG
tom_coxon	1:0734a7b0fd5e	220	printf("init card = %d\n", i);
tom_coxon	1:0734a7b0fd5e	221	#endif
tom_coxon	1:0734a7b0fd5e	222	_sectors = _sd_sectors();
tom_coxon	1:0734a7b0fd5e	223
tom_coxon	1:0734a7b0fd5e	224	// Set block length to 512 (CMD16)
tom_coxon	1:0734a7b0fd5e	225	if(_cmd(16, 512) != 0) {
tom_coxon	1:0734a7b0fd5e	226	fprintf(stderr, "Set 512-byte block timed out\n");
tom_coxon	1:0734a7b0fd5e	227	return 1;
tom_coxon	1:0734a7b0fd5e	228	}
tom_coxon	1:0734a7b0fd5e	229
tom_coxon	1:0734a7b0fd5e	230	_spi.frequency(1000000); // Set to 1MHz for data transfer
tom_coxon	1:0734a7b0fd5e	231	return 0;
tom_coxon	1:0734a7b0fd5e	232	}
tom_coxon	1:0734a7b0fd5e	233
tom_coxon	1:0734a7b0fd5e	234	int SDFileSystem::disk_write(const char *buffer, int block_number) {
tom_coxon	1:0734a7b0fd5e	235	// set write address for single block (CMD24)
tom_coxon	1:0734a7b0fd5e	236	if(_cmd(24, block_number * cdv) != 0) {
tom_coxon	1:0734a7b0fd5e	237	return 1;
tom_coxon	1:0734a7b0fd5e	238	}
tom_coxon	1:0734a7b0fd5e	239
tom_coxon	1:0734a7b0fd5e	240	// send the data block
tom_coxon	1:0734a7b0fd5e	241	_write(buffer, 512);
tom_coxon	1:0734a7b0fd5e	242	return 0;
tom_coxon	1:0734a7b0fd5e	243	}
tom_coxon	1:0734a7b0fd5e	244
tom_coxon	1:0734a7b0fd5e	245	int SDFileSystem::disk_read(char *buffer, int block_number) {
tom_coxon	1:0734a7b0fd5e	246	// set read address for single block (CMD17)
tom_coxon	1:0734a7b0fd5e	247	if(_cmd(17, block_number * cdv) != 0) {
tom_coxon	1:0734a7b0fd5e	248	return 1;
tom_coxon	1:0734a7b0fd5e	249	}
tom_coxon	1:0734a7b0fd5e	250
tom_coxon	1:0734a7b0fd5e	251	// receive the data
tom_coxon	1:0734a7b0fd5e	252	_read(buffer, 512);
tom_coxon	1:0734a7b0fd5e	253	return 0;
tom_coxon	1:0734a7b0fd5e	254	}
tom_coxon	1:0734a7b0fd5e	255
tom_coxon	1:0734a7b0fd5e	256	int SDFileSystem::disk_status() { return 0; }
tom_coxon	1:0734a7b0fd5e	257	int SDFileSystem::disk_sync() { return 0; }
tom_coxon	1:0734a7b0fd5e	258	int SDFileSystem::disk_sectors() { return _sectors; }
tom_coxon	1:0734a7b0fd5e	259
tom_coxon	1:0734a7b0fd5e	260	// PRIVATE FUNCTIONS
tom_coxon	1:0734a7b0fd5e	261
tom_coxon	1:0734a7b0fd5e	262	int SDFileSystem::_cmd(int cmd, int arg) {
tom_coxon	1:0734a7b0fd5e	263	_cs = 0;
tom_coxon	1:0734a7b0fd5e	264
tom_coxon	1:0734a7b0fd5e	265	// send a command
tom_coxon	1:0734a7b0fd5e	266	_spi.write(0x40 \| cmd);
tom_coxon	1:0734a7b0fd5e	267	_spi.write(arg >> 24);
tom_coxon	1:0734a7b0fd5e	268	_spi.write(arg >> 16);
tom_coxon	1:0734a7b0fd5e	269	_spi.write(arg >> 8);
tom_coxon	1:0734a7b0fd5e	270	_spi.write(arg >> 0);
tom_coxon	1:0734a7b0fd5e	271	_spi.write(0x95);
tom_coxon	1:0734a7b0fd5e	272
tom_coxon	1:0734a7b0fd5e	273	// wait for the repsonse (response[7] == 0)
tom_coxon	1:0734a7b0fd5e	274	for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
tom_coxon	1:0734a7b0fd5e	275	int response = _spi.write(0xFF);
tom_coxon	1:0734a7b0fd5e	276	if(!(response & 0x80)) {
tom_coxon	1:0734a7b0fd5e	277	_cs = 1;
tom_coxon	1:0734a7b0fd5e	278	_spi.write(0xFF);
tom_coxon	1:0734a7b0fd5e	279	return response;
tom_coxon	1:0734a7b0fd5e	280	}
tom_coxon	1:0734a7b0fd5e	281	}
tom_coxon	1:0734a7b0fd5e	282	_cs = 1;
tom_coxon	1:0734a7b0fd5e	283	_spi.write(0xFF);
tom_coxon	1:0734a7b0fd5e	284	return -1; // timeout
tom_coxon	1:0734a7b0fd5e	285	}
tom_coxon	1:0734a7b0fd5e	286	int SDFileSystem::_cmdx(int cmd, int arg) {
tom_coxon	1:0734a7b0fd5e	287	_cs = 0;
tom_coxon	1:0734a7b0fd5e	288
tom_coxon	1:0734a7b0fd5e	289	// send a command
tom_coxon	1:0734a7b0fd5e	290	_spi.write(0x40 \| cmd);
tom_coxon	1:0734a7b0fd5e	291	_spi.write(arg >> 24);
tom_coxon	1:0734a7b0fd5e	292	_spi.write(arg >> 16);
tom_coxon	1:0734a7b0fd5e	293	_spi.write(arg >> 8);
tom_coxon	1:0734a7b0fd5e	294	_spi.write(arg >> 0);
tom_coxon	1:0734a7b0fd5e	295	_spi.write(0x95);
tom_coxon	1:0734a7b0fd5e	296
tom_coxon	1:0734a7b0fd5e	297	// wait for the repsonse (response[7] == 0)
tom_coxon	1:0734a7b0fd5e	298	for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
tom_coxon	1:0734a7b0fd5e	299	int response = _spi.write(0xFF);
tom_coxon	1:0734a7b0fd5e	300	if(!(response & 0x80)) {
tom_coxon	1:0734a7b0fd5e	301	return response;
tom_coxon	1:0734a7b0fd5e	302	}
tom_coxon	1:0734a7b0fd5e	303	}
tom_coxon	1:0734a7b0fd5e	304	_cs = 1;
tom_coxon	1:0734a7b0fd5e	305	_spi.write(0xFF);
tom_coxon	1:0734a7b0fd5e	306	return -1; // timeout
tom_coxon	1:0734a7b0fd5e	307	}
tom_coxon	1:0734a7b0fd5e	308
tom_coxon	1:0734a7b0fd5e	309
tom_coxon	1:0734a7b0fd5e	310	int SDFileSystem::_cmd58() {
tom_coxon	1:0734a7b0fd5e	311	_cs = 0;
tom_coxon	1:0734a7b0fd5e	312	int arg = 0;
tom_coxon	1:0734a7b0fd5e	313
tom_coxon	1:0734a7b0fd5e	314	// send a command
tom_coxon	1:0734a7b0fd5e	315	_spi.write(0x40 \| 58);
tom_coxon	1:0734a7b0fd5e	316	_spi.write(arg >> 24);
tom_coxon	1:0734a7b0fd5e	317	_spi.write(arg >> 16);
tom_coxon	1:0734a7b0fd5e	318	_spi.write(arg >> 8);
tom_coxon	1:0734a7b0fd5e	319	_spi.write(arg >> 0);
tom_coxon	1:0734a7b0fd5e	320	_spi.write(0x95);
tom_coxon	1:0734a7b0fd5e	321
tom_coxon	1:0734a7b0fd5e	322	// wait for the repsonse (response[7] == 0)
tom_coxon	1:0734a7b0fd5e	323	for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
tom_coxon	1:0734a7b0fd5e	324	int response = _spi.write(0xFF);
tom_coxon	1:0734a7b0fd5e	325	if(!(response & 0x80)) {
tom_coxon	1:0734a7b0fd5e	326	int ocr = _spi.write(0xFF) << 24;
tom_coxon	1:0734a7b0fd5e	327	ocr \|= _spi.write(0xFF) << 16;
tom_coxon	1:0734a7b0fd5e	328	ocr \|= _spi.write(0xFF) << 8;
tom_coxon	1:0734a7b0fd5e	329	ocr \|= _spi.write(0xFF) << 0;
tom_coxon	1:0734a7b0fd5e	330	// printf("OCR = 0x%08X\n", ocr);
tom_coxon	1:0734a7b0fd5e	331	_cs = 1;
tom_coxon	1:0734a7b0fd5e	332	_spi.write(0xFF);
tom_coxon	1:0734a7b0fd5e	333	return response;
tom_coxon	1:0734a7b0fd5e	334	}
tom_coxon	1:0734a7b0fd5e	335	}
tom_coxon	1:0734a7b0fd5e	336	_cs = 1;
tom_coxon	1:0734a7b0fd5e	337	_spi.write(0xFF);
tom_coxon	1:0734a7b0fd5e	338	return -1; // timeout
tom_coxon	1:0734a7b0fd5e	339	}
tom_coxon	1:0734a7b0fd5e	340
tom_coxon	1:0734a7b0fd5e	341	int SDFileSystem::_cmd8() {
tom_coxon	1:0734a7b0fd5e	342	_cs = 0;
tom_coxon	1:0734a7b0fd5e	343
tom_coxon	1:0734a7b0fd5e	344	// send a command
tom_coxon	1:0734a7b0fd5e	345	_spi.write(0x40 \| 8); // CMD8
tom_coxon	1:0734a7b0fd5e	346	_spi.write(0x00); // reserved
tom_coxon	1:0734a7b0fd5e	347	_spi.write(0x00); // reserved
tom_coxon	1:0734a7b0fd5e	348	_spi.write(0x01); // 3.3v
tom_coxon	1:0734a7b0fd5e	349	_spi.write(0xAA); // check pattern
tom_coxon	1:0734a7b0fd5e	350	_spi.write(0x87); // crc
tom_coxon	1:0734a7b0fd5e	351
tom_coxon	1:0734a7b0fd5e	352	// wait for the repsonse (response[7] == 0)
tom_coxon	1:0734a7b0fd5e	353	for(int i=0; i<SD_COMMAND_TIMEOUT * 1000; i++) {
tom_coxon	1:0734a7b0fd5e	354	char response[5];
tom_coxon	1:0734a7b0fd5e	355	response[0] = _spi.write(0xFF);
tom_coxon	1:0734a7b0fd5e	356	if(!(response[0] & 0x80)) {
tom_coxon	1:0734a7b0fd5e	357	for(int j=1; j<5; j++) {
tom_coxon	1:0734a7b0fd5e	358	response[i] = _spi.write(0xFF);
tom_coxon	1:0734a7b0fd5e	359	}
tom_coxon	1:0734a7b0fd5e	360	_cs = 1;
tom_coxon	1:0734a7b0fd5e	361	_spi.write(0xFF);
tom_coxon	1:0734a7b0fd5e	362	return response[0];
tom_coxon	1:0734a7b0fd5e	363	}
tom_coxon	1:0734a7b0fd5e	364	}
tom_coxon	1:0734a7b0fd5e	365	_cs = 1;
tom_coxon	1:0734a7b0fd5e	366	_spi.write(0xFF);
tom_coxon	1:0734a7b0fd5e	367	return -1; // timeout
tom_coxon	1:0734a7b0fd5e	368	}
tom_coxon	1:0734a7b0fd5e	369
tom_coxon	1:0734a7b0fd5e	370	int SDFileSystem::_read(char *buffer, int length) {
tom_coxon	1:0734a7b0fd5e	371	_cs = 0;
tom_coxon	1:0734a7b0fd5e	372
tom_coxon	1:0734a7b0fd5e	373	// read until start byte (0xFF)
tom_coxon	1:0734a7b0fd5e	374	while(_spi.write(0xFF) != 0xFE);
tom_coxon	1:0734a7b0fd5e	375
tom_coxon	1:0734a7b0fd5e	376	// read data
tom_coxon	1:0734a7b0fd5e	377	for(int i=0; i<length; i++) {
tom_coxon	1:0734a7b0fd5e	378	buffer[i] = _spi.write(0xFF);
tom_coxon	1:0734a7b0fd5e	379	}
tom_coxon	1:0734a7b0fd5e	380	_spi.write(0xFF); // checksum
tom_coxon	1:0734a7b0fd5e	381	_spi.write(0xFF);
tom_coxon	1:0734a7b0fd5e	382
tom_coxon	1:0734a7b0fd5e	383	_cs = 1;
tom_coxon	1:0734a7b0fd5e	384	_spi.write(0xFF);
tom_coxon	1:0734a7b0fd5e	385	return 0;
tom_coxon	1:0734a7b0fd5e	386	}
tom_coxon	1:0734a7b0fd5e	387
tom_coxon	1:0734a7b0fd5e	388	int SDFileSystem::_write(const char *buffer, int length) {
tom_coxon	1:0734a7b0fd5e	389	_cs = 0;
tom_coxon	1:0734a7b0fd5e	390
tom_coxon	1:0734a7b0fd5e	391	// indicate start of block
tom_coxon	1:0734a7b0fd5e	392	_spi.write(0xFE);
tom_coxon	1:0734a7b0fd5e	393
tom_coxon	1:0734a7b0fd5e	394	// write the data
tom_coxon	1:0734a7b0fd5e	395	for(int i=0; i<length; i++) {
tom_coxon	1:0734a7b0fd5e	396	_spi.write(buffer[i]);
tom_coxon	1:0734a7b0fd5e	397	}
tom_coxon	1:0734a7b0fd5e	398
tom_coxon	1:0734a7b0fd5e	399	// write the checksum
tom_coxon	1:0734a7b0fd5e	400	_spi.write(0xFF);
tom_coxon	1:0734a7b0fd5e	401	_spi.write(0xFF);
tom_coxon	1:0734a7b0fd5e	402
tom_coxon	1:0734a7b0fd5e	403	// check the repsonse token
tom_coxon	1:0734a7b0fd5e	404	if((_spi.write(0xFF) & 0x1F) != 0x05) {
tom_coxon	1:0734a7b0fd5e	405	_cs = 1;
tom_coxon	1:0734a7b0fd5e	406	_spi.write(0xFF);
tom_coxon	1:0734a7b0fd5e	407	return 1;
tom_coxon	1:0734a7b0fd5e	408	}
tom_coxon	1:0734a7b0fd5e	409
tom_coxon	1:0734a7b0fd5e	410	// wait for write to finish
tom_coxon	1:0734a7b0fd5e	411	while(_spi.write(0xFF) == 0);
tom_coxon	1:0734a7b0fd5e	412
tom_coxon	1:0734a7b0fd5e	413	_cs = 1;
tom_coxon	1:0734a7b0fd5e	414	_spi.write(0xFF);
tom_coxon	1:0734a7b0fd5e	415	return 0;
tom_coxon	1:0734a7b0fd5e	416	}
tom_coxon	1:0734a7b0fd5e	417
tom_coxon	1:0734a7b0fd5e	418	static int ext_bits(char *data, int msb, int lsb) {
tom_coxon	1:0734a7b0fd5e	419	int bits = 0;
tom_coxon	1:0734a7b0fd5e	420	int size = 1 + msb - lsb;
tom_coxon	1:0734a7b0fd5e	421	for(int i=0; i<size; i++) {
tom_coxon	1:0734a7b0fd5e	422	int position = lsb + i;
tom_coxon	1:0734a7b0fd5e	423	int byte = 15 - (position >> 3);
tom_coxon	1:0734a7b0fd5e	424	int bit = position & 0x7;
tom_coxon	1:0734a7b0fd5e	425	int value = (data[byte] >> bit) & 1;
tom_coxon	1:0734a7b0fd5e	426	bits \|= value << i;
tom_coxon	1:0734a7b0fd5e	427	}
tom_coxon	1:0734a7b0fd5e	428	return bits;
tom_coxon	1:0734a7b0fd5e	429	}
tom_coxon	1:0734a7b0fd5e	430
tom_coxon	1:0734a7b0fd5e	431	int SDFileSystem::_sd_sectors() {
tom_coxon	1:0734a7b0fd5e	432
tom_coxon	1:0734a7b0fd5e	433	int c_size, c_size_mult, read_bl_len;
tom_coxon	1:0734a7b0fd5e	434	int block_len, mult, blocknr, capacity;
tom_coxon	1:0734a7b0fd5e	435	int blocks, hc_c_size;
tom_coxon	1:0734a7b0fd5e	436	uint64_t hc_capacity;
tom_coxon	1:0734a7b0fd5e	437
tom_coxon	1:0734a7b0fd5e	438	// CMD9, Response R2 (R1 byte + 16-byte block read)
tom_coxon	1:0734a7b0fd5e	439	if(_cmdx(9, 0) != 0) {
tom_coxon	1:0734a7b0fd5e	440	fprintf(stderr, "Didn't get a response from the disk\n");
tom_coxon	1:0734a7b0fd5e	441	return 0;
tom_coxon	1:0734a7b0fd5e	442	}
tom_coxon	1:0734a7b0fd5e	443
tom_coxon	1:0734a7b0fd5e	444	char csd[16];
tom_coxon	1:0734a7b0fd5e	445	if(_read(csd, 16) != 0) {
tom_coxon	1:0734a7b0fd5e	446	fprintf(stderr, "Couldn't read csd response from disk\n");
tom_coxon	1:0734a7b0fd5e	447	return 0;
tom_coxon	1:0734a7b0fd5e	448	}
tom_coxon	1:0734a7b0fd5e	449
tom_coxon	1:0734a7b0fd5e	450	// csd_structure : csd[127:126]
tom_coxon	1:0734a7b0fd5e	451	// c_size : csd[73:62]
tom_coxon	1:0734a7b0fd5e	452	// c_size_mult : csd[49:47]
tom_coxon	1:0734a7b0fd5e	453	// read_bl_len : csd[83:80] - the maximum read block length
tom_coxon	1:0734a7b0fd5e	454
tom_coxon	1:0734a7b0fd5e	455	int csd_structure = ext_bits(csd, 127, 126);
tom_coxon	1:0734a7b0fd5e	456
tom_coxon	1:0734a7b0fd5e	457	#ifdef DEBUG
tom_coxon	1:0734a7b0fd5e	458	printf("\n\rCSD_STRUCT = %d\n", csd_structure);
tom_coxon	1:0734a7b0fd5e	459	#endif
tom_coxon	1:0734a7b0fd5e	460
tom_coxon	1:0734a7b0fd5e	461	switch (csd_structure){
tom_coxon	1:0734a7b0fd5e	462	case 0:
tom_coxon	1:0734a7b0fd5e	463	cdv = 512;
tom_coxon	1:0734a7b0fd5e	464	c_size = ext_bits(csd, 73, 62);
tom_coxon	1:0734a7b0fd5e	465	c_size_mult = ext_bits(csd, 49, 47);
tom_coxon	1:0734a7b0fd5e	466	read_bl_len = ext_bits(csd, 83, 80);
tom_coxon	1:0734a7b0fd5e	467
tom_coxon	1:0734a7b0fd5e	468	block_len = 1 << read_bl_len;
tom_coxon	1:0734a7b0fd5e	469	mult = 1 << (c_size_mult + 2);
tom_coxon	1:0734a7b0fd5e	470	blocknr = (c_size + 1) * mult;
tom_coxon	1:0734a7b0fd5e	471	capacity = blocknr * block_len;
tom_coxon	1:0734a7b0fd5e	472	blocks = capacity / 512;
tom_coxon	1:0734a7b0fd5e	473	#ifdef DEBUG
tom_coxon	1:0734a7b0fd5e	474	printf("\n\rSDCard\n\rc_size: %.4X \n\rcapacity: %.ld \n\rsectors: %d\n\r", c_size, capacity, blocks);
tom_coxon	1:0734a7b0fd5e	475	#endif
tom_coxon	1:0734a7b0fd5e	476	break;
tom_coxon	1:0734a7b0fd5e	477
tom_coxon	1:0734a7b0fd5e	478	case 1:
tom_coxon	1:0734a7b0fd5e	479	cdv = 1;
tom_coxon	1:0734a7b0fd5e	480	hc_c_size = ext_bits(csd, 63, 48);
tom_coxon	1:0734a7b0fd5e	481	int hc_read_bl_len = ext_bits(csd, 83, 80);
tom_coxon	1:0734a7b0fd5e	482	hc_capacity = hc_c_size+1;
tom_coxon	1:0734a7b0fd5e	483	blocks = (hc_c_size+1)*1024;
tom_coxon	1:0734a7b0fd5e	484	#ifdef DEBUG
tom_coxon	1:0734a7b0fd5e	485	printf("\n\rSDHC Card \n\rhc_c_size: %.4X \n\rcapacity: %.lld \n\rsectors: %d\n\r", hc_c_size, hc_capacity5121024, blocks);
tom_coxon	1:0734a7b0fd5e	486	#endif
tom_coxon	1:0734a7b0fd5e	487	break;
tom_coxon	1:0734a7b0fd5e	488
tom_coxon	1:0734a7b0fd5e	489	default:
tom_coxon	1:0734a7b0fd5e	490	fprintf(stderr, "This disk tastes funny! I only know about type 0 CSD structures\n");
tom_coxon	1:0734a7b0fd5e	491	return 0;
tom_coxon	1:0734a7b0fd5e	492	break;
tom_coxon	1:0734a7b0fd5e	493	};
tom_coxon	1:0734a7b0fd5e	494	return blocks;
tom_coxon	1:0734a7b0fd5e	495	}

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	09 Jul 2010
Imports:	28
Forks:	1
Commits:	2
Dependents:	0
Dependencies:	3
Followers:	2

SDHCFileSystem.cpp@1:0734a7b0fd5e, 2010-08-13 (annotated)

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