204 lines
6.1 KiB
C
Executable File
204 lines
6.1 KiB
C
Executable File
/*-----------------------------------------------------------------------/
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/ PFF - Generic low level disk control module (C)ChaN, 2010
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/------------------------------------------------------------------------/
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/
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/ Copyright (C) 2010, ChaN, all right reserved.
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/
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/ * This software is a free software and there is NO WARRANTY.
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/ * No restriction on use. You can use, modify and redistribute it for
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/ personal, non-profit or commercial products UNDER YOUR RESPONSIBILITY.
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/ * Redistributions of source code must retain the above copyright notice.
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/
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/------------------------------------------------------------------------/
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/* Dec 6, 2010 First release
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*/
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#include "pff.h"
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#include "diskio.h"
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void init_spi (void); /* Initialize SPI port (asmfunc.S) */
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void deselect (void); /* Select MMC (asmfunc.S) */
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void select (void); /* Deselect MMC (asmfunc.S) */
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void xmit_spi (BYTE d); /* Send a byte to the MMC (asmfunc.S) */
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BYTE rcv_spi (void); /* Send a 0xFF to the MMC and get the received byte (asmfunc.S) */
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void dly_100us (void); /* Delay 100 microseconds (asmfunc.S) */
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/*--------------------------------------------------------------------------
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Module Private Functions
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---------------------------------------------------------------------------*/
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/* Definitions for MMC/SDC command */
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#define CMD0 (0x40+0) /* GO_IDLE_STATE */
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#define CMD1 (0x40+1) /* SEND_OP_COND (MMC) */
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#define ACMD41 (0xC0+41) /* SEND_OP_COND (SDC) */
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#define CMD8 (0x40+8) /* SEND_IF_COND */
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#define CMD16 (0x40+16) /* SET_BLOCKLEN */
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#define CMD17 (0x40+17) /* READ_SINGLE_BLOCK */
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#define CMD24 (0x40+24) /* WRITE_BLOCK */
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#define CMD55 (0x40+55) /* APP_CMD */
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#define CMD58 (0x40+58) /* READ_OCR */
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/* Card type flags (CardType) */
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#define CT_MMC 0x01 /* MMC ver 3 */
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#define CT_SD1 0x02 /* SD ver 1 */
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#define CT_SD2 0x04 /* SD ver 2 */
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#define CT_BLOCK 0x08 /* Block addressing */
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static
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BYTE CardType;
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/*-----------------------------------------------------------------------*/
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/* Send a command packet to MMC */
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/*-----------------------------------------------------------------------*/
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static
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BYTE send_cmd (
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BYTE cmd, /* 1st byte (Start + Index) */
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DWORD arg /* Argument (32 bits) */
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)
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{
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BYTE n, res;
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if (cmd & 0x80) { /* ACMD<n> is the command sequense of CMD55-CMD<n> */
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cmd &= 0x7F;
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res = send_cmd(CMD55, 0);
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if (res > 1) return res;
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}
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/* Select the card */
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select();
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/* Send a command packet */
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xmit_spi(cmd); /* Start + Command index */
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xmit_spi((BYTE)(arg >> 24)); /* Argument[31..24] */
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xmit_spi((BYTE)(arg >> 16)); /* Argument[23..16] */
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xmit_spi((BYTE)(arg >> 8)); /* Argument[15..8] */
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xmit_spi((BYTE)arg); /* Argument[7..0] */
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n = 0x01; /* Dummy CRC + Stop */
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if (cmd == CMD0) n = 0x95; /* Valid CRC for CMD0(0) */
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if (cmd == CMD8) n = 0x87; /* Valid CRC for CMD8(0x1AA) */
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xmit_spi(n);
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/* Receive a command response */
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n = 10; /* Wait for a valid response in timeout of 10 attempts */
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do {
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res = rcv_spi();
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} while ((res & 0x80) && --n);
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return res; /* Return with the response value */
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}
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/*--------------------------------------------------------------------------
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Public Functions
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---------------------------------------------------------------------------*/
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/*-----------------------------------------------------------------------*/
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/* Initialize Disk Drive */
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/*-----------------------------------------------------------------------*/
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DSTATUS disk_initialize (void)
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{
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BYTE n, cmd, ty, ocr[4];
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UINT tmr;
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init_spi(); /* Initialize ports to control MMC */
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for (n = 100; n; n--) dly_100us(); /* 10ms delay */
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for (n = 10; n; n--) deselect(); /* 80 Dummy clocks with CS=H */
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ty = 0;
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if (send_cmd(CMD0, 0) == 1) { /* Enter Idle state */
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if (send_cmd(CMD8, 0x1AA) == 1) { /* SDv2 */
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for (n = 0; n < 4; n++) ocr[n] = rcv_spi(); /* Get trailing return value of R7 resp */
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if (ocr[2] == 0x01 && ocr[3] == 0xAA) { /* The card can work at vdd range of 2.7-3.6V */
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for (tmr = 10000; tmr && send_cmd(ACMD41, 1UL << 30); tmr--) dly_100us(); /* Wait for leaving idle state (ACMD41 with HCS bit) */
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if (tmr && send_cmd(CMD58, 0) == 0) { /* Check CCS bit in the OCR */
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for (n = 0; n < 4; n++) ocr[n] = rcv_spi();
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ty = (ocr[0] & 0x40) ? CT_SD2 | CT_BLOCK : CT_SD2; /* SDv2 (HC or SC) */
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}
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}
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} else { /* SDv1 or MMCv3 */
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if (send_cmd(ACMD41, 0) <= 1) {
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ty = CT_SD1; cmd = ACMD41; /* SDv1 */
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} else {
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ty = CT_MMC; cmd = CMD1; /* MMCv3 */
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}
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for (tmr = 10000; tmr && send_cmd(cmd, 0); tmr--) dly_100us(); /* Wait for leaving idle state */
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if (!tmr || send_cmd(CMD16, 512) != 0) /* Set R/W block length to 512 */
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ty = 0;
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}
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}
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CardType = ty;
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deselect();
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return ty ? 0 : STA_NOINIT;
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}
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/*-----------------------------------------------------------------------*/
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/* Read partial sector */
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/*-----------------------------------------------------------------------*/
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DRESULT disk_readp (
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BYTE *buff, /* Pointer to the read buffer (NULL:Read bytes are forwarded to the stream) */
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DWORD lba, /* Sector number (LBA) */
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WORD ofs, /* Byte offset to read from (0..511) */
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WORD cnt /* Number of bytes to read (ofs + cnt mus be <= 512) */
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)
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{
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DRESULT res;
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BYTE rc;
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WORD bc;
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if (!(CardType & CT_BLOCK)) lba *= 512; /* Convert to byte address if needed */
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res = RES_ERROR;
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if (send_cmd(CMD17, lba) == 0) { /* READ_SINGLE_BLOCK */
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bc = 40000;
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do { /* Wait for data packet */
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rc = rcv_spi();
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} while (rc == 0xFF && --bc);
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if (rc == 0xFE) { /* A data packet arrived */
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bc = 514 - ofs - cnt;
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/* Skip leading bytes */
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if (ofs) {
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do rcv_spi(); while (--ofs);
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}
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/* Receive a part of the sector */
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do {
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*buff++ = rcv_spi();
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} while (--cnt);
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/* Skip trailing bytes and CRC */
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do rcv_spi(); while (--bc);
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res = RES_OK;
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}
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}
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deselect();
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return res;
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}
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