StarBoardOrangeTest1 - This program is for Star Board Orange. Wave file…

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Yuji Notsu / Mbed 2 deprecated StarBoardOrangeTest1

This program is for Star Board Orange. Wave file into SD card is read, and its DAC signal output.

Dependencies: EthernetNetIf mbed HTTPServer

SDHCFileSystem.cpp@0:383bff20e783, 2010-11-25 (annotated)

Committer:: y_notsu
Date:: Thu Nov 25 14:59:16 2010 +0000
Revision:: 0:383bff20e783

Who changed what in which revision?

User	Revision	Line number	New contents of line
y_notsu	0:383bff20e783	1	/* mbed SDFileSystem Library, for providing file access to SD cards
y_notsu	0:383bff20e783	2	* Copyright (c) 2008-2010, sford
y_notsu	0:383bff20e783	3	*
y_notsu	0:383bff20e783	4	* Permission is hereby granted, free of charge, to any person obtaining a copy
y_notsu	0:383bff20e783	5	* of this software and associated documentation files (the "Software"), to deal
y_notsu	0:383bff20e783	6	* in the Software without restriction, including without limitation the rights
y_notsu	0:383bff20e783	7	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
y_notsu	0:383bff20e783	8	* copies of the Software, and to permit persons to whom the Software is
y_notsu	0:383bff20e783	9	* furnished to do so, subject to the following conditions:
y_notsu	0:383bff20e783	10	*
y_notsu	0:383bff20e783	11	* The above copyright notice and this permission notice shall be included in
y_notsu	0:383bff20e783	12	* all copies or substantial portions of the Software.
y_notsu	0:383bff20e783	13	*
y_notsu	0:383bff20e783	14	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
y_notsu	0:383bff20e783	15	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
y_notsu	0:383bff20e783	16	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
y_notsu	0:383bff20e783	17	* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
y_notsu	0:383bff20e783	18	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
y_notsu	0:383bff20e783	19	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
y_notsu	0:383bff20e783	20	* THE SOFTWARE.
y_notsu	0:383bff20e783	21	*/
y_notsu	0:383bff20e783	22
y_notsu	0:383bff20e783	23	//* Introduction
y_notsu	0:383bff20e783	24	// * ------------
y_notsu	0:383bff20e783	25	// * SD and MMC cards support a number of interfaces, but common to them all
y_notsu	0:383bff20e783	26	// * is one based on SPI. This is the one I'm implmenting because it means
y_notsu	0:383bff20e783	27	// * it is much more portable even though not so performant, and we already
y_notsu	0:383bff20e783	28	// * have the mbed SPI Interface!
y_notsu	0:383bff20e783	29	// *
y_notsu	0:383bff20e783	30	// * The main reference I'm using is Chapter 7, "SPI Mode" of:
y_notsu	0:383bff20e783	31	// * http://www.sdcard.org/developers/tech/sdcard/pls/Simplified_Physical_Layer_Spec.pdf
y_notsu	0:383bff20e783	32	// *
y_notsu	0:383bff20e783	33	// * SPI Startup
y_notsu	0:383bff20e783	34	// * -----------
y_notsu	0:383bff20e783	35	// * The SD card powers up in SD mode. The SPI interface mode is selected by
y_notsu	0:383bff20e783	36	// * asserting CS low and sending the reset command (CMD0). The card will
y_notsu	0:383bff20e783	37	// * respond with a (R1) response.
y_notsu	0:383bff20e783	38	// *
y_notsu	0:383bff20e783	39	// * CMD8 is optionally sent to determine the voltage range supported, and
y_notsu	0:383bff20e783	40	// * indirectly determine whether it is a version 1.x SD/non-SD card or
y_notsu	0:383bff20e783	41	// * version 2.x. I'll just ignore this for now.
y_notsu	0:383bff20e783	42	// *
y_notsu	0:383bff20e783	43	// * ACMD41 is repeatedly issued to initialise the card, until "in idle"
y_notsu	0:383bff20e783	44	// * (bit 0) of the R1 response goes to '0', indicating it is initialised.
y_notsu	0:383bff20e783	45	// *
y_notsu	0:383bff20e783	46	// * You should also indicate whether the host supports High Capicity cards,
y_notsu	0:383bff20e783	47	// * and check whether the card is high capacity - i'll also ignore this
y_notsu	0:383bff20e783	48	// *
y_notsu	0:383bff20e783	49	// * SPI Protocol
y_notsu	0:383bff20e783	50	// * ------------
y_notsu	0:383bff20e783	51	// * The SD SPI protocol is based on transactions made up of 8-bit words, with
y_notsu	0:383bff20e783	52	//* the host starting every bus transaction by asserting the CS signal low. The
y_notsu	0:383bff20e783	53	// * card always responds to commands, data blocks and errors.
y_notsu	0:383bff20e783	54	// *
y_notsu	0:383bff20e783	55	// * The protocol supports a CRC, but by default it is off (except for the
y_notsu	0:383bff20e783	56	// * first reset CMD0, where the CRC can just be pre-calculated, and CMD8)
y_notsu	0:383bff20e783	57	// * I'll leave the CRC off I think!
y_notsu	0:383bff20e783	58	// *
y_notsu	0:383bff20e783	59	// * Standard capacity cards have variable data block sizes, whereas High
y_notsu	0:383bff20e783	60	// * Capacity cards fix the size of data block to 512 bytes. I'll therefore
y_notsu	0:383bff20e783	61	// * just always use the Standard Capacity cards with a block size of 512 bytes.
y_notsu	0:383bff20e783	62	// * This is set with CMD16.
y_notsu	0:383bff20e783	63	// *
y_notsu	0:383bff20e783	64	// * You can read and write single blocks (CMD17, CMD25) or multiple blocks
y_notsu	0:383bff20e783	65	// * (CMD18, CMD25). For simplicity, I'll just use single block accesses. When
y_notsu	0:383bff20e783	66	// * the card gets a read command, it responds with a response token, and then
y_notsu	0:383bff20e783	67	// * a data token or an error.
y_notsu	0:383bff20e783	68	// *
y_notsu	0:383bff20e783	69	// * SPI Command Format
y_notsu	0:383bff20e783	70	// * ------------------
y_notsu	0:383bff20e783	71	// * Commands are 6-bytes long, containing the command, 32-bit argument, and CRC.
y_notsu	0:383bff20e783	72	// *
y_notsu	0:383bff20e783	73	// * +---------------+------------+------------+-----------+----------+--------------+
y_notsu	0:383bff20e783	74	// * \| 01 \| cmd[5:0] \| arg[31:24] \| arg[23:16] \| arg[15:8] \| arg[7:0] \| crc[6:0] \| 1 \|
y_notsu	0:383bff20e783	75	// * +---------------+------------+------------+-----------+----------+--------------+
y_notsu	0:383bff20e783	76	// *
y_notsu	0:383bff20e783	77	// * As I'm not using CRC, I can fix that byte to what is needed for CMD0 (0x95)
y_notsu	0:383bff20e783	78	// *
y_notsu	0:383bff20e783	79	// * All Application Specific commands shall be preceded with APP_CMD (CMD55).
y_notsu	0:383bff20e783	80	// *
y_notsu	0:383bff20e783	81	// * SPI Response Format
y_notsu	0:383bff20e783	82	// * -------------------
y_notsu	0:383bff20e783	83	// * The main response format (R1) is a status byte (normally zero). Key flags:
y_notsu	0:383bff20e783	84	// * idle - 1 if the card is in an idle state/initialising
y_notsu	0:383bff20e783	85	// * cmd - 1 if an illegal command code was detected
y_notsu	0:383bff20e783	86	// *
y_notsu	0:383bff20e783	87	// * +-------------------------------------------------+
y_notsu	0:383bff20e783	88	// * R1 \| 0 \| arg \| addr \| seq \| crc \| cmd \| erase \| idle \|
y_notsu	0:383bff20e783	89	// * +-------------------------------------------------+
y_notsu	0:383bff20e783	90	// *
y_notsu	0:383bff20e783	91	// * R1b is the same, except it is followed by a busy signal (zeros) until
y_notsu	0:383bff20e783	92	// * the first non-zero byte when it is ready again.
y_notsu	0:383bff20e783	93	// *
y_notsu	0:383bff20e783	94	// * Data Response Token
y_notsu	0:383bff20e783	95	// * -------------------
y_notsu	0:383bff20e783	96	// * Every data block written to the card is acknowledged by a byte
y_notsu	0:383bff20e783	97	// * response token
y_notsu	0:383bff20e783	98	// *
y_notsu	0:383bff20e783	99	// * +----------------------+
y_notsu	0:383bff20e783	100	// * \| xxx \| 0 \| status \| 1 \|
y_notsu	0:383bff20e783	101	// * +----------------------+
y_notsu	0:383bff20e783	102	// * 010 - OK!
y_notsu	0:383bff20e783	103	// * 101 - CRC Error
y_notsu	0:383bff20e783	104	// * 110 - Write Error
y_notsu	0:383bff20e783	105	// *
y_notsu	0:383bff20e783	106	// * Single Block Read and Write
y_notsu	0:383bff20e783	107	// * ---------------------------
y_notsu	0:383bff20e783	108	// *
y_notsu	0:383bff20e783	109	// * Block transfers have a byte header, followed by the data, followed
y_notsu	0:383bff20e783	110	// * by a 16-bit CRC. In our case, the data will always be 512 bytes.
y_notsu	0:383bff20e783	111	// *
y_notsu	0:383bff20e783	112	// * +------+---------+---------+- - - -+---------+-----------+----------+
y_notsu	0:383bff20e783	113	// * \| 0xFE \| data[0] \| data[1] \| \| data[n] \| crc[15:8] \| crc[7:0] \|
y_notsu	0:383bff20e783	114	// * +------+---------+---------+- - - -+---------+-----------+----------+
y_notsu	0:383bff20e783	115	// */
y_notsu	0:383bff20e783	116	//
y_notsu	0:383bff20e783	117	//*
y_notsu	0:383bff20e783	118	// * Comment: Changes for SDHC support till 32GB
y_notsu	0:383bff20e783	119	// * Name: KB
y_notsu	0:383bff20e783	120	// * Date: 07/24/2010
y_notsu	0:383bff20e783	121	// * Release: 0.1
y_notsu	0:383bff20e783	122	// */
y_notsu	0:383bff20e783	123
y_notsu	0:383bff20e783	124	#include "SDHCFileSystem.h"
y_notsu	0:383bff20e783	125
y_notsu	0:383bff20e783	126	#define DEBUG
y_notsu	0:383bff20e783	127	#define SD_COMMAND_TIMEOUT 5000
y_notsu	0:383bff20e783	128
y_notsu	0:383bff20e783	129
y_notsu	0:383bff20e783	130	SDFileSystem::SDFileSystem(PinName mosi, PinName miso, PinName sclk, PinName cs, const char* name) :
y_notsu	0:383bff20e783	131	FATFileSystem(name), _spi(mosi, miso, sclk), _cs(cs) {
y_notsu	0:383bff20e783	132	_cs = 1;
y_notsu	0:383bff20e783	133	}
y_notsu	0:383bff20e783	134
y_notsu	0:383bff20e783	135	#define R1_IDLE_STATE (1 << 0)
y_notsu	0:383bff20e783	136	#define R1_ERASE_RESET (1 << 1)
y_notsu	0:383bff20e783	137	#define R1_ILLEGAL_COMMAND (1 << 2)
y_notsu	0:383bff20e783	138	#define R1_COM_CRC_ERROR (1 << 3)
y_notsu	0:383bff20e783	139	#define R1_ERASE_SEQUENCE_ERROR (1 << 4)
y_notsu	0:383bff20e783	140	#define R1_ADDRESS_ERROR (1 << 5)
y_notsu	0:383bff20e783	141	#define R1_PARAMETER_ERROR (1 << 6)
y_notsu	0:383bff20e783	142
y_notsu	0:383bff20e783	143	// Types
y_notsu	0:383bff20e783	144	// - v1.x Standard Capacity
y_notsu	0:383bff20e783	145	// - v2.x Standard Capacity
y_notsu	0:383bff20e783	146	// - v2.x High Capacity
y_notsu	0:383bff20e783	147	// - Not recognised as an SD Card
y_notsu	0:383bff20e783	148
y_notsu	0:383bff20e783	149	#define SDCARD_FAIL 0
y_notsu	0:383bff20e783	150	#define SDCARD_V1 1
y_notsu	0:383bff20e783	151	#define SDCARD_V2 2
y_notsu	0:383bff20e783	152	#define SDCARD_V2HC 3
y_notsu	0:383bff20e783	153
y_notsu	0:383bff20e783	154	int SDFileSystem::initialise_card() {
y_notsu	0:383bff20e783	155	// Set to 100kHz for initialisation, and clock card with cs = 1
y_notsu	0:383bff20e783	156	_spi.frequency(100000);
y_notsu	0:383bff20e783	157	_cs = 1;
y_notsu	0:383bff20e783	158	for(int i=0; i<16; i++) {
y_notsu	0:383bff20e783	159	_spi.write(0xFF);
y_notsu	0:383bff20e783	160	}
y_notsu	0:383bff20e783	161
y_notsu	0:383bff20e783	162	// send CMD0, should return with all zeros except IDLE STATE set (bit 0)
y_notsu	0:383bff20e783	163	if(_cmd(0, 0) != R1_IDLE_STATE) {
y_notsu	0:383bff20e783	164	fprintf(stderr, "No disk, or could not put SD card in to SPI idle state\n");
y_notsu	0:383bff20e783	165	return SDCARD_FAIL;
y_notsu	0:383bff20e783	166	}
y_notsu	0:383bff20e783	167
y_notsu	0:383bff20e783	168	// send CMD8 to determine whther it is ver 2.x
y_notsu	0:383bff20e783	169	int r = _cmd8();
y_notsu	0:383bff20e783	170	if(r == R1_IDLE_STATE) {
y_notsu	0:383bff20e783	171	return initialise_card_v2();
y_notsu	0:383bff20e783	172	} else if(r == (R1_IDLE_STATE \| R1_ILLEGAL_COMMAND)) {
y_notsu	0:383bff20e783	173	return initialise_card_v1();
y_notsu	0:383bff20e783	174	} else {
y_notsu	0:383bff20e783	175	fprintf(stderr, "Not in idle state after sending CMD8 (not an SD card?)\n");
y_notsu	0:383bff20e783	176	return SDCARD_FAIL;
y_notsu	0:383bff20e783	177	}
y_notsu	0:383bff20e783	178	}
y_notsu	0:383bff20e783	179
y_notsu	0:383bff20e783	180	int SDFileSystem::initialise_card_v1() {
y_notsu	0:383bff20e783	181	for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
y_notsu	0:383bff20e783	182	_cmd(55, 0);
y_notsu	0:383bff20e783	183	if(_cmd(41, 0) == 0) {
y_notsu	0:383bff20e783	184	cdv = 512;
y_notsu	0:383bff20e783	185	#ifdef DEBUG
y_notsu	0:383bff20e783	186	printf("\n\rInit: SEDCARD_V1\n\r");
y_notsu	0:383bff20e783	187	#endif
y_notsu	0:383bff20e783	188	return SDCARD_V1;
y_notsu	0:383bff20e783	189	}
y_notsu	0:383bff20e783	190	}
y_notsu	0:383bff20e783	191
y_notsu	0:383bff20e783	192	fprintf(stderr, "Timeout waiting for v1.x card\n");
y_notsu	0:383bff20e783	193	return SDCARD_FAIL;
y_notsu	0:383bff20e783	194	}
y_notsu	0:383bff20e783	195
y_notsu	0:383bff20e783	196	int SDFileSystem::initialise_card_v2() {
y_notsu	0:383bff20e783	197
y_notsu	0:383bff20e783	198	for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
y_notsu	0:383bff20e783	199	wait_ms(50);
y_notsu	0:383bff20e783	200	_cmd58();
y_notsu	0:383bff20e783	201	_cmd(55, 0);
y_notsu	0:383bff20e783	202	if(_cmd(41, 0x40000000) == 0) {
y_notsu	0:383bff20e783	203	_cmd58();
y_notsu	0:383bff20e783	204	#ifdef DEBUG
y_notsu	0:383bff20e783	205	printf("\n\rInit: SDCARD_V2\n\r");
y_notsu	0:383bff20e783	206	#endif
y_notsu	0:383bff20e783	207	cdv = 1;
y_notsu	0:383bff20e783	208	return SDCARD_V2;
y_notsu	0:383bff20e783	209	}
y_notsu	0:383bff20e783	210	}
y_notsu	0:383bff20e783	211
y_notsu	0:383bff20e783	212	fprintf(stderr, "Timeout waiting for v2.x card\n");
y_notsu	0:383bff20e783	213	return SDCARD_FAIL;
y_notsu	0:383bff20e783	214	}
y_notsu	0:383bff20e783	215
y_notsu	0:383bff20e783	216	int SDFileSystem::disk_initialize() {
y_notsu	0:383bff20e783	217
y_notsu	0:383bff20e783	218	int i = initialise_card();
y_notsu	0:383bff20e783	219	#ifdef DEBUG
y_notsu	0:383bff20e783	220	printf("init card = %d\n", i);
y_notsu	0:383bff20e783	221	#endif
y_notsu	0:383bff20e783	222	_sectors = _sd_sectors();
y_notsu	0:383bff20e783	223
y_notsu	0:383bff20e783	224	// Set block length to 512 (CMD16)
y_notsu	0:383bff20e783	225	if(_cmd(16, 512) != 0) {
y_notsu	0:383bff20e783	226	fprintf(stderr, "Set 512-byte block timed out\n");
y_notsu	0:383bff20e783	227	return 1;
y_notsu	0:383bff20e783	228	}
y_notsu	0:383bff20e783	229
y_notsu	0:383bff20e783	230	_spi.frequency(1000000); // Set to 1MHz for data transfer
y_notsu	0:383bff20e783	231	return 0;
y_notsu	0:383bff20e783	232	}
y_notsu	0:383bff20e783	233
y_notsu	0:383bff20e783	234	int SDFileSystem::disk_write(const char *buffer, int block_number) {
y_notsu	0:383bff20e783	235	// set write address for single block (CMD24)
y_notsu	0:383bff20e783	236	if(_cmd(24, block_number * cdv) != 0) {
y_notsu	0:383bff20e783	237	return 1;
y_notsu	0:383bff20e783	238	}
y_notsu	0:383bff20e783	239
y_notsu	0:383bff20e783	240	// send the data block
y_notsu	0:383bff20e783	241	_write(buffer, 512);
y_notsu	0:383bff20e783	242	return 0;
y_notsu	0:383bff20e783	243	}
y_notsu	0:383bff20e783	244
y_notsu	0:383bff20e783	245	int SDFileSystem::disk_read(char *buffer, int block_number) {
y_notsu	0:383bff20e783	246	// set read address for single block (CMD17)
y_notsu	0:383bff20e783	247	if(_cmd(17, block_number * cdv) != 0) {
y_notsu	0:383bff20e783	248	return 1;
y_notsu	0:383bff20e783	249	}
y_notsu	0:383bff20e783	250
y_notsu	0:383bff20e783	251	// receive the data
y_notsu	0:383bff20e783	252	_read(buffer, 512);
y_notsu	0:383bff20e783	253	return 0;
y_notsu	0:383bff20e783	254	}
y_notsu	0:383bff20e783	255
y_notsu	0:383bff20e783	256	int SDFileSystem::disk_status() { return 0; }
y_notsu	0:383bff20e783	257	int SDFileSystem::disk_sync() { return 0; }
y_notsu	0:383bff20e783	258	int SDFileSystem::disk_sectors() { return _sectors; }
y_notsu	0:383bff20e783	259
y_notsu	0:383bff20e783	260	// PRIVATE FUNCTIONS
y_notsu	0:383bff20e783	261
y_notsu	0:383bff20e783	262	int SDFileSystem::_cmd(int cmd, int arg) {
y_notsu	0:383bff20e783	263	_cs = 0;
y_notsu	0:383bff20e783	264
y_notsu	0:383bff20e783	265	// send a command
y_notsu	0:383bff20e783	266	_spi.write(0x40 \| cmd);
y_notsu	0:383bff20e783	267	_spi.write(arg >> 24);
y_notsu	0:383bff20e783	268	_spi.write(arg >> 16);
y_notsu	0:383bff20e783	269	_spi.write(arg >> 8);
y_notsu	0:383bff20e783	270	_spi.write(arg >> 0);
y_notsu	0:383bff20e783	271	_spi.write(0x95);
y_notsu	0:383bff20e783	272
y_notsu	0:383bff20e783	273	// wait for the repsonse (response[7] == 0)
y_notsu	0:383bff20e783	274	for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
y_notsu	0:383bff20e783	275	int response = _spi.write(0xFF);
y_notsu	0:383bff20e783	276	if(!(response & 0x80)) {
y_notsu	0:383bff20e783	277	_cs = 1;
y_notsu	0:383bff20e783	278	_spi.write(0xFF);
y_notsu	0:383bff20e783	279	return response;
y_notsu	0:383bff20e783	280	}
y_notsu	0:383bff20e783	281	}
y_notsu	0:383bff20e783	282	_cs = 1;
y_notsu	0:383bff20e783	283	_spi.write(0xFF);
y_notsu	0:383bff20e783	284	return -1; // timeout
y_notsu	0:383bff20e783	285	}
y_notsu	0:383bff20e783	286	int SDFileSystem::_cmdx(int cmd, int arg) {
y_notsu	0:383bff20e783	287	_cs = 0;
y_notsu	0:383bff20e783	288
y_notsu	0:383bff20e783	289	// send a command
y_notsu	0:383bff20e783	290	_spi.write(0x40 \| cmd);
y_notsu	0:383bff20e783	291	_spi.write(arg >> 24);
y_notsu	0:383bff20e783	292	_spi.write(arg >> 16);
y_notsu	0:383bff20e783	293	_spi.write(arg >> 8);
y_notsu	0:383bff20e783	294	_spi.write(arg >> 0);
y_notsu	0:383bff20e783	295	_spi.write(0x95);
y_notsu	0:383bff20e783	296
y_notsu	0:383bff20e783	297	// wait for the repsonse (response[7] == 0)
y_notsu	0:383bff20e783	298	for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
y_notsu	0:383bff20e783	299	int response = _spi.write(0xFF);
y_notsu	0:383bff20e783	300	if(!(response & 0x80)) {
y_notsu	0:383bff20e783	301	return response;
y_notsu	0:383bff20e783	302	}
y_notsu	0:383bff20e783	303	}
y_notsu	0:383bff20e783	304	_cs = 1;
y_notsu	0:383bff20e783	305	_spi.write(0xFF);
y_notsu	0:383bff20e783	306	return -1; // timeout
y_notsu	0:383bff20e783	307	}
y_notsu	0:383bff20e783	308
y_notsu	0:383bff20e783	309
y_notsu	0:383bff20e783	310	int SDFileSystem::_cmd58() {
y_notsu	0:383bff20e783	311	_cs = 0;
y_notsu	0:383bff20e783	312	int arg = 0;
y_notsu	0:383bff20e783	313
y_notsu	0:383bff20e783	314	// send a command
y_notsu	0:383bff20e783	315	_spi.write(0x40 \| 58);
y_notsu	0:383bff20e783	316	_spi.write(arg >> 24);
y_notsu	0:383bff20e783	317	_spi.write(arg >> 16);
y_notsu	0:383bff20e783	318	_spi.write(arg >> 8);
y_notsu	0:383bff20e783	319	_spi.write(arg >> 0);
y_notsu	0:383bff20e783	320	_spi.write(0x95);
y_notsu	0:383bff20e783	321
y_notsu	0:383bff20e783	322	// wait for the repsonse (response[7] == 0)
y_notsu	0:383bff20e783	323	for(int i=0; i<SD_COMMAND_TIMEOUT; i++) {
y_notsu	0:383bff20e783	324	int response = _spi.write(0xFF);
y_notsu	0:383bff20e783	325	if(!(response & 0x80)) {
y_notsu	0:383bff20e783	326	int ocr = _spi.write(0xFF) << 24;
y_notsu	0:383bff20e783	327	ocr \|= _spi.write(0xFF) << 16;
y_notsu	0:383bff20e783	328	ocr \|= _spi.write(0xFF) << 8;
y_notsu	0:383bff20e783	329	ocr \|= _spi.write(0xFF) << 0;
y_notsu	0:383bff20e783	330	// printf("OCR = 0x%08X\n", ocr);
y_notsu	0:383bff20e783	331	_cs = 1;
y_notsu	0:383bff20e783	332	_spi.write(0xFF);
y_notsu	0:383bff20e783	333	return response;
y_notsu	0:383bff20e783	334	}
y_notsu	0:383bff20e783	335	}
y_notsu	0:383bff20e783	336	_cs = 1;
y_notsu	0:383bff20e783	337	_spi.write(0xFF);
y_notsu	0:383bff20e783	338	return -1; // timeout
y_notsu	0:383bff20e783	339	}
y_notsu	0:383bff20e783	340
y_notsu	0:383bff20e783	341	int SDFileSystem::_cmd8() {
y_notsu	0:383bff20e783	342	_cs = 0;
y_notsu	0:383bff20e783	343
y_notsu	0:383bff20e783	344	// send a command
y_notsu	0:383bff20e783	345	_spi.write(0x40 \| 8); // CMD8
y_notsu	0:383bff20e783	346	_spi.write(0x00); // reserved
y_notsu	0:383bff20e783	347	_spi.write(0x00); // reserved
y_notsu	0:383bff20e783	348	_spi.write(0x01); // 3.3v
y_notsu	0:383bff20e783	349	_spi.write(0xAA); // check pattern
y_notsu	0:383bff20e783	350	_spi.write(0x87); // crc
y_notsu	0:383bff20e783	351
y_notsu	0:383bff20e783	352	// wait for the repsonse (response[7] == 0)
y_notsu	0:383bff20e783	353	for(int i=0; i<SD_COMMAND_TIMEOUT * 1000; i++) {
y_notsu	0:383bff20e783	354	char response[5];
y_notsu	0:383bff20e783	355	response[0] = _spi.write(0xFF);
y_notsu	0:383bff20e783	356	if(!(response[0] & 0x80)) {
y_notsu	0:383bff20e783	357	for(int j=1; j<5; j++) {
y_notsu	0:383bff20e783	358	response[i] = _spi.write(0xFF);
y_notsu	0:383bff20e783	359	}
y_notsu	0:383bff20e783	360	_cs = 1;
y_notsu	0:383bff20e783	361	_spi.write(0xFF);
y_notsu	0:383bff20e783	362	return response[0];
y_notsu	0:383bff20e783	363	}
y_notsu	0:383bff20e783	364	}
y_notsu	0:383bff20e783	365	_cs = 1;
y_notsu	0:383bff20e783	366	_spi.write(0xFF);
y_notsu	0:383bff20e783	367	return -1; // timeout
y_notsu	0:383bff20e783	368	}
y_notsu	0:383bff20e783	369
y_notsu	0:383bff20e783	370	int SDFileSystem::_read(char *buffer, int length) {
y_notsu	0:383bff20e783	371	_cs = 0;
y_notsu	0:383bff20e783	372
y_notsu	0:383bff20e783	373	// read until start byte (0xFF)
y_notsu	0:383bff20e783	374	while(_spi.write(0xFF) != 0xFE);
y_notsu	0:383bff20e783	375
y_notsu	0:383bff20e783	376	// read data
y_notsu	0:383bff20e783	377	for(int i=0; i<length; i++) {
y_notsu	0:383bff20e783	378	buffer[i] = _spi.write(0xFF);
y_notsu	0:383bff20e783	379	}
y_notsu	0:383bff20e783	380	_spi.write(0xFF); // checksum
y_notsu	0:383bff20e783	381	_spi.write(0xFF);
y_notsu	0:383bff20e783	382
y_notsu	0:383bff20e783	383	_cs = 1;
y_notsu	0:383bff20e783	384	_spi.write(0xFF);
y_notsu	0:383bff20e783	385	return 0;
y_notsu	0:383bff20e783	386	}
y_notsu	0:383bff20e783	387
y_notsu	0:383bff20e783	388	int SDFileSystem::_write(const char *buffer, int length) {
y_notsu	0:383bff20e783	389	_cs = 0;
y_notsu	0:383bff20e783	390
y_notsu	0:383bff20e783	391	// indicate start of block
y_notsu	0:383bff20e783	392	_spi.write(0xFE);
y_notsu	0:383bff20e783	393
y_notsu	0:383bff20e783	394	// write the data
y_notsu	0:383bff20e783	395	for(int i=0; i<length; i++) {
y_notsu	0:383bff20e783	396	_spi.write(buffer[i]);
y_notsu	0:383bff20e783	397	}
y_notsu	0:383bff20e783	398
y_notsu	0:383bff20e783	399	// write the checksum
y_notsu	0:383bff20e783	400	_spi.write(0xFF);
y_notsu	0:383bff20e783	401	_spi.write(0xFF);
y_notsu	0:383bff20e783	402
y_notsu	0:383bff20e783	403	// check the repsonse token
y_notsu	0:383bff20e783	404	if((_spi.write(0xFF) & 0x1F) != 0x05) {
y_notsu	0:383bff20e783	405	_cs = 1;
y_notsu	0:383bff20e783	406	_spi.write(0xFF);
y_notsu	0:383bff20e783	407	return 1;
y_notsu	0:383bff20e783	408	}
y_notsu	0:383bff20e783	409
y_notsu	0:383bff20e783	410	// wait for write to finish
y_notsu	0:383bff20e783	411	while(_spi.write(0xFF) == 0);
y_notsu	0:383bff20e783	412
y_notsu	0:383bff20e783	413	_cs = 1;
y_notsu	0:383bff20e783	414	_spi.write(0xFF);
y_notsu	0:383bff20e783	415	return 0;
y_notsu	0:383bff20e783	416	}
y_notsu	0:383bff20e783	417
y_notsu	0:383bff20e783	418	static int ext_bits(char *data, int msb, int lsb) {
y_notsu	0:383bff20e783	419	int bits = 0;
y_notsu	0:383bff20e783	420	int size = 1 + msb - lsb;
y_notsu	0:383bff20e783	421	for(int i=0; i<size; i++) {
y_notsu	0:383bff20e783	422	int position = lsb + i;
y_notsu	0:383bff20e783	423	int byte = 15 - (position >> 3);
y_notsu	0:383bff20e783	424	int bit = position & 0x7;
y_notsu	0:383bff20e783	425	int value = (data[byte] >> bit) & 1;
y_notsu	0:383bff20e783	426	bits \|= value << i;
y_notsu	0:383bff20e783	427	}
y_notsu	0:383bff20e783	428	return bits;
y_notsu	0:383bff20e783	429	}
y_notsu	0:383bff20e783	430
y_notsu	0:383bff20e783	431	int SDFileSystem::_sd_sectors() {
y_notsu	0:383bff20e783	432
y_notsu	0:383bff20e783	433	int c_size, c_size_mult, read_bl_len;
y_notsu	0:383bff20e783	434	int block_len, mult, blocknr, capacity;
y_notsu	0:383bff20e783	435	int blocks, hc_c_size;
y_notsu	0:383bff20e783	436	uint64_t hc_capacity;
y_notsu	0:383bff20e783	437
y_notsu	0:383bff20e783	438	// CMD9, Response R2 (R1 byte + 16-byte block read)
y_notsu	0:383bff20e783	439	if(_cmdx(9, 0) != 0) {
y_notsu	0:383bff20e783	440	fprintf(stderr, "Didn't get a response from the disk\n");
y_notsu	0:383bff20e783	441	return 0;
y_notsu	0:383bff20e783	442	}
y_notsu	0:383bff20e783	443
y_notsu	0:383bff20e783	444	char csd[16];
y_notsu	0:383bff20e783	445	if(_read(csd, 16) != 0) {
y_notsu	0:383bff20e783	446	fprintf(stderr, "Couldn't read csd response from disk\n");
y_notsu	0:383bff20e783	447	return 0;
y_notsu	0:383bff20e783	448	}
y_notsu	0:383bff20e783	449
y_notsu	0:383bff20e783	450	// csd_structure : csd[127:126]
y_notsu	0:383bff20e783	451	// c_size : csd[73:62]
y_notsu	0:383bff20e783	452	// c_size_mult : csd[49:47]
y_notsu	0:383bff20e783	453	// read_bl_len : csd[83:80] - the maximum read block length
y_notsu	0:383bff20e783	454
y_notsu	0:383bff20e783	455	int csd_structure = ext_bits(csd, 127, 126);
y_notsu	0:383bff20e783	456
y_notsu	0:383bff20e783	457	#ifdef DEBUG
y_notsu	0:383bff20e783	458	printf("\n\rCSD_STRUCT = %d\n", csd_structure);
y_notsu	0:383bff20e783	459	#endif
y_notsu	0:383bff20e783	460
y_notsu	0:383bff20e783	461	switch (csd_structure){
y_notsu	0:383bff20e783	462	case 0:
y_notsu	0:383bff20e783	463	cdv = 512;
y_notsu	0:383bff20e783	464	c_size = ext_bits(csd, 73, 62);
y_notsu	0:383bff20e783	465	c_size_mult = ext_bits(csd, 49, 47);
y_notsu	0:383bff20e783	466	read_bl_len = ext_bits(csd, 83, 80);
y_notsu	0:383bff20e783	467
y_notsu	0:383bff20e783	468	block_len = 1 << read_bl_len;
y_notsu	0:383bff20e783	469	mult = 1 << (c_size_mult + 2);
y_notsu	0:383bff20e783	470	blocknr = (c_size + 1) * mult;
y_notsu	0:383bff20e783	471	capacity = blocknr * block_len;
y_notsu	0:383bff20e783	472	blocks = capacity / 512;
y_notsu	0:383bff20e783	473	#ifdef DEBUG
y_notsu	0:383bff20e783	474	printf("\n\rSDCard\n\rc_size: %.4X \n\rcapacity: %.ld \n\rsectors: %d\n\r", c_size, capacity, blocks);
y_notsu	0:383bff20e783	475	#endif
y_notsu	0:383bff20e783	476	break;
y_notsu	0:383bff20e783	477
y_notsu	0:383bff20e783	478	case 1:
y_notsu	0:383bff20e783	479	cdv = 1;
y_notsu	0:383bff20e783	480	hc_c_size = ext_bits(csd, 63, 48);
y_notsu	0:383bff20e783	481	int hc_read_bl_len = ext_bits(csd, 83, 80);
y_notsu	0:383bff20e783	482	hc_capacity = hc_c_size+1;
y_notsu	0:383bff20e783	483	blocks = (hc_c_size+1)*1024;
y_notsu	0:383bff20e783	484	#ifdef DEBUG
y_notsu	0:383bff20e783	485	printf("\n\rSDHC Card \n\rhc_c_size: %.4X \n\rcapacity: %.lld \n\rsectors: %d\n\r", hc_c_size, hc_capacity5121024, blocks);
y_notsu	0:383bff20e783	486	#endif
y_notsu	0:383bff20e783	487	break;
y_notsu	0:383bff20e783	488
y_notsu	0:383bff20e783	489	default:
y_notsu	0:383bff20e783	490	fprintf(stderr, "This disk tastes funny! I only know about type 0 CSD structures\n");
y_notsu	0:383bff20e783	491	return 0;
y_notsu	0:383bff20e783	492	// break;
y_notsu	0:383bff20e783	493	};
y_notsu	0:383bff20e783	494	return blocks;
y_notsu	0:383bff20e783	495	}

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	25 Nov 2010
Imports:	22
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	4
Followers:	2

SDHCFileSystem.cpp@0:383bff20e783, 2010-11-25 (annotated)

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