mmc.h

用ATmega8 做的MP3播放器

/*
 * Copyright (c) 2003-2004 K. John '2B|!2B' Crispin
 * Copyright (c) 2005      Stephan Dobretsberger
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA02111-1307USA
 *
 * Feedback, Bugs, ... mail [e-mail]
 *
 */

//#define MMC_WRITE in the following file
#include "config.h"

#include <avr/io.h>
#include <avr/signal.h>
#include <avr/interrupt.h>

// look in datasheet for complete list of commands
#define MMC_CMD_0_GO_IDLE            0
#define MMC_CMD_1_SEND_OP_COND       1
#define MMC_CMD_9_SEND_CSD           9
#define MMC_CMD_10_SEND_CID         10
#define MMC_CMD_12_STOP             12
#define MMC_CMD_13_SEND_STATUS      13
#define MMC_CMD_16_BLOCKLEN         16
#define MMC_CMD_17_READ_SINGLE      17
#define MMC_CMD_18_READ_MULTIPLE    18
#define MMC_CMD_24_WRITE_SINGLE     24

// bit definitions for R1
#define MMC_R1_IN_IDLE            0x01
#define MMC_R1B_BUSY_BYTE         0x00

// different defines for tokens etc ...
#define MMC_START_TOKEN_SINGLE    0xfe
#define MMC_START_TOKEN_MULTI     0xfc

// return values from a write operation
#define MMC_DATA_ACCEPT           0x02
#define MMC_DATA_CRC              0x05
#define MMC_DATA_WRITE_ERROR      0x06

// errors for fat32
#define FAT_INVALID_ID            0x00
#define FAT_OK                    0x01


// this structure holds info on the MMC card currently inserted
typedef struct _VOLUME_INFO
{ u08 size_MB;
  u08 sector_multiply;
  u16 sector_count;
  u08 name[6];
} VOLUME_INFO;

// starts the hardware
void MMC_hw_init(void);
// starts up the MMC card
void MMC_init(void);
// starts the read process of a sector
void MMC_get_sec_start(u16 sectorh, u16 sectorl);
// starts the read process of a part of a sector
void MMC_get_part_sec_start(u16 sectorh, u16 sectorl, u16 offset, u16 length);
// gets the next byte from the MMC card
u08 MMC_get_sec_next(void);
// stop read process of a sector
void MMC_get_sec_stop(void);

// deselcets the MMC
void MMC_CS_deselect(void);
//selects the MMC for transmission
void MMC_CS_select(void);

// allows sending data to the MMC
void MMC_enable(void);
// disables sending data to the MMC
void MMC_disable(void);

// sends receives a byte on the spi bus
u08 MMC_io(u08 data);

void MMC_cleanup(void);