/*******************************************************************************
* Function Name : MSD_ReadMultiBlock
* Description : None
* Input : - sector:
* - buffer:
* - NbrOfSector:
* Output : None
* Return : None
* Attention : None
*******************************************************************************/
uint8 AppSdReadBytesInBlk(uint32 BlkAddr, uint32 OffsetAddr, uint32 InBlkByteNum, uint8 *DataBuf)
{
uint32 sector = BlkAddr;
if((OffsetAddr + InBlkByteNum) > MSD_BLOCKSIZE) //读范围不能垮块
{
while(1);
}
if(OffsetAddr == 0 && InBlkByteNum == MSD_BLOCKSIZE) //读一整块
{
if(MSD_ReadSingleBlock(sector, DataBuf) != 0)
{
return FALSE;
}
}
else //读块的一部分
{
if(MSD_ReadSingleBlock(sector, gSdRWBuf) != 0)
{
return FALSE;
}
memcpy(DataBuf, &gSdRWBuf[OffsetAddr], InBlkByteNum);
}
return TRUE;
}
DRESULT disk_read (
BYTE drv, /* Physical drive nmuber (0..) */
BYTE *buff, /* Data buffer to store read data */
DWORD sector, /* Sector address (LBA) */
BYTE count /* Number of sectors to read (1..255) */
)
{
int Status;
if( !count )
{
return RES_PARERR; /* count不能等于0，否则返回参数错误 */
}
switch (drv)
{
case 0:
if(count==1) /* 1个sector的读操作 */
{
Status = MSD_ReadSingleBlock( sector ,buff );
}
else /* 多个sector的读操作 */
{
Status = MSD_ReadMultiBlock( sector , buff ,count);
}
if(Status == 0)
{
return RES_OK;
}
else
{
return RES_ERROR;
}
case 1:
break;
case 2:
break;
default:
break;
}
return RES_ERROR;
}