SDCARD_PFF - This is Petit FAT File System Module for mbed NXP…

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Shinichiro Nakamura / Mbed 2 deprecated SDCARD_PFF

This is Petit FAT File System Module for mbed NXP LPC1768. The ported library from http://elm-chan.org/fsw/ff/00index_p.html made by Mr. ChaN. The connection is same as SDCard library here http://mbed.org/projects/cookbook/wiki/SDCard . If you need change a pin, You can find the definition at libpff/connect.h :)

Dependencies: mbed

libpff/mmc.c@1:a24950493dec, 2010-06-04 (annotated)

Committer:: shintamainjp
Date:: Fri Jun 04 23:47:39 2010 +0000
Revision:: 1:a24950493dec
Parent:: 0:b5453be5ad07

Who changed what in which revision?

User	Revision	Line number	New contents of line
shintamainjp	0:b5453be5ad07	1	/-----------------------------------------------------------------------/
shintamainjp	0:b5453be5ad07	2	/* PFF - Low level disk control module for ATtiny85 (C)ChaN, 2009 */
shintamainjp	0:b5453be5ad07	3	/-----------------------------------------------------------------------/
shintamainjp	0:b5453be5ad07	4
shintamainjp	0:b5453be5ad07	5	#define _WRITE_FUNC 1
shintamainjp	0:b5453be5ad07	6
shintamainjp	0:b5453be5ad07	7	#include "diskio.h"
shintamainjp	0:b5453be5ad07	8	#include "mbed.h"
shintamainjp	0:b5453be5ad07	9	#include "connect.h"
shintamainjp	0:b5453be5ad07	10
shintamainjp	0:b5453be5ad07	11	/* Definitions for MMC/SDC command */
shintamainjp	0:b5453be5ad07	12	#define CMD0 (0x40+0) /* GO_IDLE_STATE */
shintamainjp	0:b5453be5ad07	13	#define CMD1 (0x40+1) /* SEND_OP_COND (MMC) */
shintamainjp	0:b5453be5ad07	14	#define ACMD41 (0xC0+41) /* SEND_OP_COND (SDC) */
shintamainjp	0:b5453be5ad07	15	#define CMD8 (0x40+8) /* SEND_IF_COND */
shintamainjp	0:b5453be5ad07	16	#define CMD16 (0x40+16) /* SET_BLOCKLEN */
shintamainjp	0:b5453be5ad07	17	#define CMD17 (0x40+17) /* READ_SINGLE_BLOCK */
shintamainjp	0:b5453be5ad07	18	#define CMD24 (0x40+24) /* WRITE_BLOCK */
shintamainjp	0:b5453be5ad07	19	#define CMD55 (0x40+55) /* APP_CMD */
shintamainjp	0:b5453be5ad07	20	#define CMD58 (0x40+58) /* READ_OCR */
shintamainjp	0:b5453be5ad07	21
shintamainjp	0:b5453be5ad07	22	SPI device(CONNECT_MOSI,CONNECT_MISO,CONNECT_SCK);
shintamainjp	0:b5453be5ad07	23	DigitalOut cs(CONNECT_CS);
shintamainjp	0:b5453be5ad07	24
shintamainjp	0:b5453be5ad07	25	/* Port Controls (Platform dependent) */
shintamainjp	0:b5453be5ad07	26	#define SELECT() cs.write(0) /* MMC CS = L */
shintamainjp	0:b5453be5ad07	27	#define DESELECT() cs.write(1) /* MMC CS = H */
shintamainjp	0:b5453be5ad07	28	#define MMC_SEL !cs.read() /* MMC CS status (true:selected) */
shintamainjp	0:b5453be5ad07	29
shintamainjp	0:b5453be5ad07	30	void xmit_spi (BYTE c) {
shintamainjp	0:b5453be5ad07	31	device.write(c); /* Send a byte */
shintamainjp	0:b5453be5ad07	32	}
shintamainjp	0:b5453be5ad07	33
shintamainjp	0:b5453be5ad07	34	BYTE rcv_spi (void) {
shintamainjp	0:b5453be5ad07	35	return device.write(0xff);
shintamainjp	0:b5453be5ad07	36	}
shintamainjp	0:b5453be5ad07	37
shintamainjp	0:b5453be5ad07	38	/*--------------------------------------------------------------------------
shintamainjp	0:b5453be5ad07	39
shintamainjp	0:b5453be5ad07	40	Module Private Functions
shintamainjp	0:b5453be5ad07	41
shintamainjp	0:b5453be5ad07	42	---------------------------------------------------------------------------*/
shintamainjp	0:b5453be5ad07	43
shintamainjp	0:b5453be5ad07	44	static
shintamainjp	0:b5453be5ad07	45	BYTE CardType;
shintamainjp	0:b5453be5ad07	46
shintamainjp	0:b5453be5ad07	47
shintamainjp	0:b5453be5ad07	48	/-----------------------------------------------------------------------/
shintamainjp	0:b5453be5ad07	49	/* Deselect the card and release SPI bus */
shintamainjp	0:b5453be5ad07	50	/-----------------------------------------------------------------------/
shintamainjp	0:b5453be5ad07	51
shintamainjp	0:b5453be5ad07	52	static
shintamainjp	0:b5453be5ad07	53	void release_spi (void) {
shintamainjp	0:b5453be5ad07	54	DESELECT();
shintamainjp	0:b5453be5ad07	55	rcv_spi();
shintamainjp	0:b5453be5ad07	56	}
shintamainjp	0:b5453be5ad07	57
shintamainjp	0:b5453be5ad07	58
shintamainjp	0:b5453be5ad07	59	/-----------------------------------------------------------------------/
shintamainjp	0:b5453be5ad07	60	/* Send a command packet to MMC */
shintamainjp	0:b5453be5ad07	61	/-----------------------------------------------------------------------/
shintamainjp	0:b5453be5ad07	62
shintamainjp	0:b5453be5ad07	63	static
shintamainjp	0:b5453be5ad07	64	BYTE send_cmd (
shintamainjp	0:b5453be5ad07	65	BYTE cmd, /* Command byte */
shintamainjp	0:b5453be5ad07	66	DWORD arg /* Argument */
shintamainjp	0:b5453be5ad07	67	) {
shintamainjp	0:b5453be5ad07	68	BYTE n, res;
shintamainjp	0:b5453be5ad07	69
shintamainjp	0:b5453be5ad07	70
shintamainjp	0:b5453be5ad07	71	if (cmd & 0x80) { /* ACMD<n> is the command sequense of CMD55-CMD<n> */
shintamainjp	0:b5453be5ad07	72	cmd &= 0x7F;
shintamainjp	0:b5453be5ad07	73	res = send_cmd(CMD55, 0);
shintamainjp	0:b5453be5ad07	74	if (res > 1) return res;
shintamainjp	0:b5453be5ad07	75	}
shintamainjp	0:b5453be5ad07	76
shintamainjp	0:b5453be5ad07	77	/* Select the card */
shintamainjp	0:b5453be5ad07	78	DESELECT();
shintamainjp	0:b5453be5ad07	79	rcv_spi();
shintamainjp	0:b5453be5ad07	80	SELECT();
shintamainjp	0:b5453be5ad07	81	rcv_spi();
shintamainjp	0:b5453be5ad07	82
shintamainjp	0:b5453be5ad07	83	/* Send a command packet */
shintamainjp	0:b5453be5ad07	84	xmit_spi(cmd); /* Start + Command index */
shintamainjp	0:b5453be5ad07	85	xmit_spi((BYTE)(arg >> 24)); /* Argument[31..24] */
shintamainjp	0:b5453be5ad07	86	xmit_spi((BYTE)(arg >> 16)); /* Argument[23..16] */
shintamainjp	0:b5453be5ad07	87	xmit_spi((BYTE)(arg >> 8)); /* Argument[15..8] */
shintamainjp	0:b5453be5ad07	88	xmit_spi((BYTE)arg); /* Argument[7..0] */
shintamainjp	0:b5453be5ad07	89	n = 0x01; /* Dummy CRC + Stop */
shintamainjp	0:b5453be5ad07	90	if (cmd == CMD0) n = 0x95; /* Valid CRC for CMD0(0) */
shintamainjp	0:b5453be5ad07	91	if (cmd == CMD8) n = 0x87; /* Valid CRC for CMD8(0x1AA) */
shintamainjp	0:b5453be5ad07	92	xmit_spi(n);
shintamainjp	0:b5453be5ad07	93
shintamainjp	0:b5453be5ad07	94	/* Receive a command response */
shintamainjp	0:b5453be5ad07	95	n = 10; /* Wait for a valid response in timeout of 10 attempts */
shintamainjp	0:b5453be5ad07	96	do {
shintamainjp	0:b5453be5ad07	97	res = rcv_spi();
shintamainjp	0:b5453be5ad07	98	} while ((res & 0x80) && --n);
shintamainjp	0:b5453be5ad07	99
shintamainjp	0:b5453be5ad07	100	return res; /* Return with the response value */
shintamainjp	0:b5453be5ad07	101	}
shintamainjp	0:b5453be5ad07	102
shintamainjp	0:b5453be5ad07	103
shintamainjp	0:b5453be5ad07	104
shintamainjp	0:b5453be5ad07	105	/*--------------------------------------------------------------------------
shintamainjp	0:b5453be5ad07	106
shintamainjp	0:b5453be5ad07	107	Public Functions
shintamainjp	0:b5453be5ad07	108
shintamainjp	0:b5453be5ad07	109	---------------------------------------------------------------------------*/
shintamainjp	0:b5453be5ad07	110
shintamainjp	0:b5453be5ad07	111
shintamainjp	0:b5453be5ad07	112	/-----------------------------------------------------------------------/
shintamainjp	0:b5453be5ad07	113	/* Initialize Disk Drive */
shintamainjp	0:b5453be5ad07	114	/-----------------------------------------------------------------------/
shintamainjp	0:b5453be5ad07	115
shintamainjp	0:b5453be5ad07	116	DSTATUS disk_initialize (void) {
shintamainjp	0:b5453be5ad07	117	BYTE n, cmd, ty, ocr[4];
shintamainjp	0:b5453be5ad07	118	WORD tmr;
shintamainjp	0:b5453be5ad07	119
shintamainjp	0:b5453be5ad07	120	DESELECT();
shintamainjp	0:b5453be5ad07	121	device.format(8);
shintamainjp	0:b5453be5ad07	122	device.frequency(SPI_FREQ);
shintamainjp	0:b5453be5ad07	123
shintamainjp	0:b5453be5ad07	124	#if _WRITE_FUNC
shintamainjp	0:b5453be5ad07	125	if (MMC_SEL) disk_writep(0, 0); /* Finalize write process if it is in progress */
shintamainjp	0:b5453be5ad07	126	#endif
shintamainjp	0:b5453be5ad07	127	for (n = 100; n; n--) rcv_spi(); /* Dummy clocks */
shintamainjp	0:b5453be5ad07	128
shintamainjp	0:b5453be5ad07	129	ty = 0;
shintamainjp	0:b5453be5ad07	130	if (send_cmd(CMD0, 0) == 1) { /* Enter Idle state */
shintamainjp	0:b5453be5ad07	131	if (send_cmd(CMD8, 0x1AA) == 1) { /* SDv2 */
shintamainjp	0:b5453be5ad07	132	for (n = 0; n < 4; n++) ocr[n] = rcv_spi(); /* Get trailing return value of R7 resp */
shintamainjp	0:b5453be5ad07	133	if (ocr[2] == 0x01 && ocr[3] == 0xAA) { /* The card can work at vdd range of 2.7-3.6V */
shintamainjp	0:b5453be5ad07	134	for (tmr = 12000; tmr && send_cmd(ACMD41, 1UL << 30); tmr--) ; /* Wait for leaving idle state (ACMD41 with HCS bit) */
shintamainjp	0:b5453be5ad07	135	if (tmr && send_cmd(CMD58, 0) == 0) { /* Check CCS bit in the OCR */
shintamainjp	0:b5453be5ad07	136	for (n = 0; n < 4; n++) ocr[n] = rcv_spi();
shintamainjp	0:b5453be5ad07	137	ty = (ocr[0] & 0x40) ? CT_SD2 \| CT_BLOCK : CT_SD2; /* SDv2 (HC or SC) */
shintamainjp	0:b5453be5ad07	138	}
shintamainjp	0:b5453be5ad07	139	}
shintamainjp	0:b5453be5ad07	140	} else { /* SDv1 or MMCv3 */
shintamainjp	0:b5453be5ad07	141	if (send_cmd(ACMD41, 0) <= 1) {
shintamainjp	0:b5453be5ad07	142	ty = CT_SD1;
shintamainjp	0:b5453be5ad07	143	cmd = ACMD41; /* SDv1 */
shintamainjp	0:b5453be5ad07	144	} else {
shintamainjp	0:b5453be5ad07	145	ty = CT_MMC;
shintamainjp	0:b5453be5ad07	146	cmd = CMD1; /* MMCv3 */
shintamainjp	0:b5453be5ad07	147	}
shintamainjp	0:b5453be5ad07	148	for (tmr = 25000; tmr && send_cmd(cmd, 0); tmr--) ; /* Wait for leaving idle state */
shintamainjp	0:b5453be5ad07	149	if (!tmr \|\| send_cmd(CMD16, 512) != 0) /* Set R/W block length to 512 */
shintamainjp	0:b5453be5ad07	150	ty = 0;
shintamainjp	0:b5453be5ad07	151	}
shintamainjp	0:b5453be5ad07	152	}
shintamainjp	0:b5453be5ad07	153	CardType = ty;
shintamainjp	0:b5453be5ad07	154	release_spi();
shintamainjp	0:b5453be5ad07	155
shintamainjp	0:b5453be5ad07	156	return ty ? 0 : STA_NOINIT;
shintamainjp	0:b5453be5ad07	157	}
shintamainjp	0:b5453be5ad07	158
shintamainjp	0:b5453be5ad07	159
shintamainjp	0:b5453be5ad07	160
shintamainjp	0:b5453be5ad07	161	/-----------------------------------------------------------------------/
shintamainjp	0:b5453be5ad07	162	/* Read partial sector */
shintamainjp	0:b5453be5ad07	163	/-----------------------------------------------------------------------/
shintamainjp	0:b5453be5ad07	164
shintamainjp	0:b5453be5ad07	165	DRESULT disk_readp (
shintamainjp	0:b5453be5ad07	166	BYTE buff, / Pointer to the read buffer (NULL:Read bytes are forwarded to the stream) */
shintamainjp	0:b5453be5ad07	167	DWORD lba, /* Sector number (LBA) */
shintamainjp	0:b5453be5ad07	168	WORD ofs, /* Byte offset to read from (0..511) */
shintamainjp	0:b5453be5ad07	169	WORD cnt /* Number of bytes to read (ofs + cnt mus be <= 512) */
shintamainjp	0:b5453be5ad07	170	) {
shintamainjp	0:b5453be5ad07	171	DRESULT res;
shintamainjp	0:b5453be5ad07	172	BYTE rc;
shintamainjp	0:b5453be5ad07	173	WORD bc;
shintamainjp	0:b5453be5ad07	174
shintamainjp	0:b5453be5ad07	175
shintamainjp	0:b5453be5ad07	176	if (!(CardType & CT_BLOCK)) lba = 512; / Convert to byte address if needed */
shintamainjp	0:b5453be5ad07	177
shintamainjp	0:b5453be5ad07	178	res = RES_ERROR;
shintamainjp	0:b5453be5ad07	179	if (send_cmd(CMD17, lba) == 0) { /* READ_SINGLE_BLOCK */
shintamainjp	0:b5453be5ad07	180
shintamainjp	0:b5453be5ad07	181	bc = 30000;
shintamainjp	0:b5453be5ad07	182	do { /* Wait for data packet in timeout of 100ms */
shintamainjp	0:b5453be5ad07	183	rc = rcv_spi();
shintamainjp	0:b5453be5ad07	184	} while (rc == 0xFF && --bc);
shintamainjp	0:b5453be5ad07	185
shintamainjp	0:b5453be5ad07	186	if (rc == 0xFE) { /* A data packet arrived */
shintamainjp	0:b5453be5ad07	187	bc = 514 - ofs - cnt;
shintamainjp	0:b5453be5ad07	188
shintamainjp	0:b5453be5ad07	189	/* Skip leading bytes */
shintamainjp	0:b5453be5ad07	190	if (ofs) {
shintamainjp	0:b5453be5ad07	191	do {
shintamainjp	0:b5453be5ad07	192	rcv_spi();
shintamainjp	0:b5453be5ad07	193	} while (--ofs);
shintamainjp	0:b5453be5ad07	194	}
shintamainjp	0:b5453be5ad07	195
shintamainjp	0:b5453be5ad07	196	/* Receive a part of the sector */
shintamainjp	0:b5453be5ad07	197	if (buff) { /* Store data to the memory */
shintamainjp	0:b5453be5ad07	198	do {
shintamainjp	0:b5453be5ad07	199	*buff++ = rcv_spi();
shintamainjp	0:b5453be5ad07	200	} while (--cnt);
shintamainjp	0:b5453be5ad07	201	} else { /* Forward data to the outgoing stream (depends on the project) */
shintamainjp	0:b5453be5ad07	202	do {
shintamainjp	0:b5453be5ad07	203	rcv_spi();
shintamainjp	0:b5453be5ad07	204	} while (--cnt);
shintamainjp	0:b5453be5ad07	205	}
shintamainjp	0:b5453be5ad07	206
shintamainjp	0:b5453be5ad07	207	/* Skip trailing bytes and CRC */
shintamainjp	0:b5453be5ad07	208	do rcv_spi();
shintamainjp	0:b5453be5ad07	209	while (--bc);
shintamainjp	0:b5453be5ad07	210
shintamainjp	0:b5453be5ad07	211	res = RES_OK;
shintamainjp	0:b5453be5ad07	212	}
shintamainjp	0:b5453be5ad07	213	}
shintamainjp	0:b5453be5ad07	214
shintamainjp	0:b5453be5ad07	215	release_spi();
shintamainjp	0:b5453be5ad07	216
shintamainjp	0:b5453be5ad07	217	return res;
shintamainjp	0:b5453be5ad07	218	}
shintamainjp	0:b5453be5ad07	219
shintamainjp	0:b5453be5ad07	220
shintamainjp	0:b5453be5ad07	221
shintamainjp	0:b5453be5ad07	222	/-----------------------------------------------------------------------/
shintamainjp	0:b5453be5ad07	223	/* Write partial sector */
shintamainjp	0:b5453be5ad07	224	/-----------------------------------------------------------------------/
shintamainjp	0:b5453be5ad07	225	#if _WRITE_FUNC
shintamainjp	0:b5453be5ad07	226
shintamainjp	0:b5453be5ad07	227	DRESULT disk_writep (
shintamainjp	0:b5453be5ad07	228	const BYTE buff, / Pointer to the bytes to be written (NULL:Initiate/Finalize sector write) */
shintamainjp	0:b5453be5ad07	229	DWORD sa /* Number of bytes to send, Sector number (LBA) or zero */
shintamainjp	0:b5453be5ad07	230	) {
shintamainjp	0:b5453be5ad07	231	DRESULT res;
shintamainjp	0:b5453be5ad07	232	WORD bc;
shintamainjp	0:b5453be5ad07	233	static WORD wc;
shintamainjp	0:b5453be5ad07	234
shintamainjp	0:b5453be5ad07	235
shintamainjp	0:b5453be5ad07	236	res = RES_ERROR;
shintamainjp	0:b5453be5ad07	237
shintamainjp	0:b5453be5ad07	238	if (buff) { /* Send data bytes */
shintamainjp	0:b5453be5ad07	239	bc = (WORD)sa;
shintamainjp	0:b5453be5ad07	240	while (bc && wc) { /* Send data bytes to the card */
shintamainjp	0:b5453be5ad07	241	xmit_spi(*buff++);
shintamainjp	0:b5453be5ad07	242	wc--;
shintamainjp	0:b5453be5ad07	243	bc--;
shintamainjp	0:b5453be5ad07	244	}
shintamainjp	0:b5453be5ad07	245	res = RES_OK;
shintamainjp	0:b5453be5ad07	246	} else {
shintamainjp	0:b5453be5ad07	247	if (sa) { /* Initiate sector write process */
shintamainjp	0:b5453be5ad07	248	if (!(CardType & CT_BLOCK)) sa = 512; / Convert to byte address if needed */
shintamainjp	0:b5453be5ad07	249	if (send_cmd(CMD24, sa) == 0) { /* WRITE_SINGLE_BLOCK */
shintamainjp	0:b5453be5ad07	250	xmit_spi(0xFF);
shintamainjp	0:b5453be5ad07	251	xmit_spi(0xFE); /* Data block header */
shintamainjp	0:b5453be5ad07	252	wc = 512; /* Set byte counter */
shintamainjp	0:b5453be5ad07	253	res = RES_OK;
shintamainjp	0:b5453be5ad07	254	}
shintamainjp	0:b5453be5ad07	255	} else { /* Finalize sector write process */
shintamainjp	0:b5453be5ad07	256	bc = wc + 2;
shintamainjp	0:b5453be5ad07	257	while (bc--) xmit_spi(0); /* Fill left bytes and CRC with zeros */
shintamainjp	0:b5453be5ad07	258	if ((rcv_spi() & 0x1F) == 0x05) { /* Receive data resp and wait for end of write process in timeout of 300ms */
shintamainjp	0:b5453be5ad07	259	for (bc = 65000; rcv_spi() != 0xFF && bc; bc--) ; /* Wait ready */
shintamainjp	0:b5453be5ad07	260	if (bc) res = RES_OK;
shintamainjp	0:b5453be5ad07	261	}
shintamainjp	0:b5453be5ad07	262	release_spi();
shintamainjp	0:b5453be5ad07	263	}
shintamainjp	0:b5453be5ad07	264	}
shintamainjp	0:b5453be5ad07	265
shintamainjp	0:b5453be5ad07	266	return res;
shintamainjp	0:b5453be5ad07	267	}
shintamainjp	0:b5453be5ad07	268	#endif

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	01 Jun 2010
Imports:	45
Forks:	0
Commits:	2
Dependents:	0
Dependencies:	1
Followers:	5

libpff/mmc.c@1:a24950493dec, 2010-06-04 (annotated)

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