f_driver.c

来自「S3C2410 USB Mass storage 源码.」· C语言 代码 · 共 61 行

/***************************************************************/
/*
 * F_driver.c, 20070206, denny
 *
 * A Marconix Software Product
 * Copyright(c) Marconix Co., Ltd. 2007
 * All Rights Reserved. Reproduction, adaption, or
 * translation without prior written permission is
 * prohibited, except as allowed under the copyright laws.
 */
/***************************************************************/

#include "F_system.h"

#ifdef _READ_SD_
//#include "inc.h" 
#include "F_driver.h"


u32 SectorInBuffer = 0xFFFFFFFF;
u32 DCache_LBA = 0xFFFFFFFF;
u8 DCache[512*8] = {0};


u8 F_ReadSector(tHANDLE Fhandle, u32 Lba, u16 Sectornum, u8 *buffer)
{
	if(Sectornum == 0)
	{
		if(SectorInBuffer == Lba)
			return ERR_NONE;
		
		if((DCache_LBA <= Lba)&&(Lba<DCache_LBA+8))
		{
			memcpy(buffer, &DCache[0x200*((Lba - DCache_LBA)%8)], 0x200);
			SectorInBuffer = Lba;
		}
		else
		{
			SDI_ReadSector(Fhandle, Lba, 8, DCache);
			memcpy(buffer, &DCache[0], 0x200);
			SectorInBuffer = Lba;
			DCache_LBA = Lba;
		}
	}
	else
	{
		SDI_ReadSector(Fhandle, Lba, Sectornum, buffer);
	}
	return ERR_NONE;
}

u8 F_WriteSector(tHANDLE Fhandle, u32 Lba, u16 Sectornum, u8 *buffer)
{
	SDI_WriteSector(Fhandle, Lba, Sectornum, buffer);

	return ERR_NONE;
}

#endif /* _READ_SD_ */