165 lines
4.3 KiB
C++
165 lines
4.3 KiB
C++
/*
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Copyright 2016-2023 melonDS team
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This file is part of melonDS.
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melonDS is free software: you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation, either version 3 of the License, or (at your option)
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any later version.
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melonDS is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with melonDS. If not, see http://www.gnu.org/licenses/.
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*/
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#include "FATIO.h"
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#include "fatfs/ff.h"
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#include "fatfs/diskio.h"
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using namespace melonDS;
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static ff_disk_read_cb ReadCb;
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static ff_disk_write_cb WriteCb;
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static LBA_t SectorCount;
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static DSTATUS Status = STA_NOINIT | STA_NODISK;
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void melonDS::ff_disk_open(const ff_disk_read_cb& readcb, const ff_disk_write_cb& writecb, LBA_t seccnt)
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{
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if (!readcb) return;
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ReadCb = readcb;
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WriteCb = writecb;
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SectorCount = seccnt;
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Status &= ~STA_NODISK;
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if (!writecb) Status |= STA_PROTECT;
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else Status &= ~STA_PROTECT;
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}
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void melonDS::ff_disk_close()
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{
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ReadCb = nullptr;
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WriteCb = nullptr;
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SectorCount = 0;
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Status &= ~STA_PROTECT;
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Status |= STA_NODISK;
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}
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/*-----------------------------------------------------------------------*/
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/* Get Drive Status */
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/*-----------------------------------------------------------------------*/
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DSTATUS disk_status (
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BYTE pdrv /* Physical drive nmuber to identify the drive */
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)
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{
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return Status;
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}
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/*-----------------------------------------------------------------------*/
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/* Inidialize a Drive */
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/*-----------------------------------------------------------------------*/
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DSTATUS disk_initialize (
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BYTE pdrv /* Physical drive nmuber to identify the drive */
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)
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{
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Status &= ~STA_NOINIT;
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return Status;
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}
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/*-----------------------------------------------------------------------*/
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/* Read Sector(s) */
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/*-----------------------------------------------------------------------*/
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DRESULT disk_read (
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BYTE pdrv, /* Physical drive nmuber to identify the drive */
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BYTE *buff, /* Data buffer to store read data */
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LBA_t sector, /* Start sector in LBA */
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UINT count /* Number of sectors to read */
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)
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{
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if (Status & (STA_NOINIT | STA_NODISK)) return RES_NOTRDY;
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if (!ReadCb) return RES_ERROR;
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UINT res = ReadCb(buff, sector, count);
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if (res != count) return RES_ERROR;
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return RES_OK;
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}
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/*-----------------------------------------------------------------------*/
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/* Write Sector(s) */
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/*-----------------------------------------------------------------------*/
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#if FF_FS_READONLY == 0
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DRESULT disk_write (
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BYTE pdrv, /* Physical drive nmuber to identify the drive */
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const BYTE *buff, /* Data to be written */
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LBA_t sector, /* Start sector in LBA */
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UINT count /* Number of sectors to write */
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)
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{
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if (Status & (STA_NOINIT | STA_NODISK)) return RES_NOTRDY;
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if (Status & STA_PROTECT) return RES_WRPRT;
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if (!WriteCb) return RES_ERROR;
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UINT res = WriteCb(buff, sector, count);
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if (res != count) return RES_ERROR;
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return RES_OK;
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}
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#endif
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/*-----------------------------------------------------------------------*/
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/* Miscellaneous Functions */
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/*-----------------------------------------------------------------------*/
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DRESULT disk_ioctl (
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BYTE pdrv, /* Physical drive nmuber (0..) */
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BYTE cmd, /* Control code */
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void *buff /* Buffer to send/receive control data */
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)
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{
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switch (cmd)
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{
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case CTRL_SYNC:
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// TODO: fflush?
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return RES_OK;
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case GET_SECTOR_COUNT:
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*(LBA_t*)buff = SectorCount;
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return RES_OK;
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case GET_SECTOR_SIZE:
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*(WORD*)buff = 0x200;
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return RES_OK;
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case GET_BLOCK_SIZE:
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*(DWORD*)buff = 1;
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return RES_OK;
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case CTRL_TRIM:
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// TODO??
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return RES_OK;
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}
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//printf("FatFS: unknown disk_ioctl(%02X, %02X, %p)\n", pdrv, cmd, buff);
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return RES_PARERR;
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}
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