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https://github.com/ekeeke/Genesis-Plus-GX.git
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100 lines
2.5 KiB
C
100 lines
2.5 KiB
C
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/****************************************************************************
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* FAT16 - VFAT Support
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*
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* NOTE: Only supports FAT16 with Long File Names
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* I have no interest in adding FAT32
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*
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* Reference Documentation:
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*
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* FAT: General Overview of On-Disk Format
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* Version 1.02 May 05, 1999
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* Microsoft Corporation
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*
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* FAT: General Overview of On-Disk Format
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* Version 1.03 December 06, 2000
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* Microsoft Corporation
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*
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* This is targetted at MMC/SD cards.
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*
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* Copyright softdev 2007. All rights reserved.
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*
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* Diskio Module
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* -------------
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*
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* This module is almost identical to the one found in ChaN's TinyFAT FS.
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* It's a logical abstration after all :)
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*
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* This covers stdio file on a SD image file
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****************************************************************************/
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#include <gccore.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sdcard.h>
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#include "vfat.h"
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/* Not so public exports from card_io.c */
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#define MAX_DRIVE 2
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extern u8 g_CID[MAX_DRIVE][16];
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extern u8 g_CSD[MAX_DRIVE][16];
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extern u8 g_CardStatus[MAX_DRIVE][64];
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extern s32 card_initIO(s32 drv_no);
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extern s32 card_readSector(s32 drv_no,u32 sector_no,u8 *buf,u32 len);
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extern s32 card_writeSector(s32 drv_no,u32 sector_no,const void *buf,u32 len);
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extern s32 card_readStatus(s32 drv_no);
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#define CARDIO_ERROR_READY 0
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/* End of not so public exports */
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/****************************************************************************
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* DISKIO_Init
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*
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* Initialise communication with the disc
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****************************************************************************/
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int DISKIO_Init( int drive )
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{
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int res;
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if ( drive < 0 || drive > 1 )
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return FS_ERR_PARAM;
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res = card_initIO( drive );
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if ( res == CARDIO_ERROR_READY )
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return FS_SUCCESS;
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return FS_ERR_IO;
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}
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/****************************************************************************
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* DISKIO_ReadSectors
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*
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* Read sectors from the disc
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****************************************************************************/
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int DISKIO_ReadSectors( int drive, void *buffer, int sector, int count )
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{
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int res = -1;
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int i;
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int bytes = 0;
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if ( drive != 0 && drive != 1 )
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return FS_ERR_PARAM; /* Must be 0 or 1 */
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/* libOGC appears to only read in single sectors */
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for( i = 0; i < count; i++ )
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{
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res = card_readSector( (int)drive, sector + i, buffer + bytes, SECTOR_SIZE);
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if ( res != CARDIO_ERROR_READY )
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return FS_ERR_IO;
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bytes += SECTOR_SIZE;
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}
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if ( res == CARDIO_ERROR_READY )
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return FS_SUCCESS;
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return FS_ERR_IO;
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}
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