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/*-----------------------------------------------------------------------*/
/* Low level disk I/O module skeleton for FatFs (C)ChaN, 2007 */
/*-----------------------------------------------------------------------*/
/* This is a stub disk I/O module that acts as front end of the existing */
/* disk I/O modules and attach it to FatFs module with common interface. */
/*-----------------------------------------------------------------------*/
#include "../../gfx.h"
#if GFX_USE_GFILE && GFILE_NEED_PETITFS && GFX_USE_OS_CHIBIOS && !GFILE_PETITFS_EXTERNAL_LIB
#include "gfile_petitfs_wrapper.h"
#include <string.h>
#if HAL_USE_MMC_SPI && HAL_USE_SDC
#error "cannot specify both MMC_SPI and SDC drivers"
#endif
#if HAL_USE_MMC_SPI
extern MMCDriver MMCD1;
#elif HAL_USE_SDC
extern SDCDriver SDCD1;
#else
#error "MMC_SPI or SDC driver must be specified"
#endif
/*-----------------------------------------------------------------------*/
/* Initialize a Drive */
DSTATUS disk_initialize (void) {
#if HAL_USE_MMC_SPI
/* It is initialized externally, just reads the status.*/
if (blkGetDriverState(&MMCD1) != BLK_READY)
return STA_NOINIT;
#else
/* It is initialized externally, just reads the status.*/
if (blkGetDriverState(&SDCD1) != BLK_READY)
return STA_NOINIT;
#endif
// All good
return 0;
}
/*-----------------------------------------------------------------------*/
/* Read Part Sector(s) */
static BYTE sectBuf[512];
static DWORD sectpos = -1;
DRESULT disk_readp (
BYTE* buff, /* [OUT] Pointer to the read buffer */
DWORD sector, /* [IN] Sector number */
UINT offset, /* [IN] Byte offset in the sector to start to read */
UINT count /* [IN] Number of bytes to read */
) {
if (sector != sectpos) {
#if HAL_USE_MMC_SPI
if (blkGetDriverState(&MMCD1) != BLK_READY)
return RES_NOTRDY;
if (mmcStartSequentialRead(&MMCD1, sector))
return RES_ERROR;
if (mmcSequentialRead(&MMCD1, sectBuf))
return RES_ERROR;
if (mmcStopSequentialRead(&MMCD1))
return RES_ERROR;
#else
if (blkGetDriverState(&SDCD1) != BLK_READY)
return RES_NOTRDY;
if (sdcRead(&SDCD1, sector, sectBuf, 1))
return RES_ERROR;
#endif
sectpos = sector;
dmaBufferInvalidate(sectBuf, sizeof(sectBuf));
}
memcpy(buff, sectBuf + offset, count);
return RES_OK;
}
#endif // GFX_USE_GFILE && GFILE_NEED_PETITFS && GFX_USE_OS_CHIBIOS && !GFILE_PETITFS_EXTERNAL_LIB
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