/**
* @brief Reads Sector(s)
* @param lun : lun id
* @param *buff: Data buffer to store read data
* @param sector: Sector address (LBA)
* @param count: Number of sectors to read (1..128)
* @retval DRESULT: Operation result
*/
DRESULT USBH_read(BYTE lun, BYTE *buff, DWORD sector, UINT count)
{
DRESULT res = RES_ERROR;
MSC_LUNTypeDef info;
USBH_StatusTypeDef status = USBH_OK;
if ((DWORD)buff & 3) /* DMA Alignment issue, do single up to aligned buffer */
{
#if _USE_BUFF_WO_ALIGNMENT == 0
while ((count--)&&(status == USBH_OK))
{
status = USBH_MSC_Read(&usb_msc_host_param[lun], lun, sector + count, (unsigned char *)scratch, 1);
if(status == USBH_OK)
{
memcpy (&buff[count * _MAX_SS] ,scratch, _MAX_SS);
}
else
{
break;
}
}
#else
return res;
#endif
}
else
{
status = USBH_MSC_Read(&usb_msc_host_param[lun], lun, sector, buff, count);
}
if(status == USBH_OK)
{
res = RES_OK;
}
else
{
USBH_MSC_GetLUNInfo(&usb_msc_host_param[lun], lun, &info);
switch (info.sense.asc)
{
case SCSI_ASC_LOGICAL_UNIT_NOT_READY:
case SCSI_ASC_MEDIUM_NOT_PRESENT:
case SCSI_ASC_NOT_READY_TO_READY_CHANGE:
USBH_ErrLog ("USB Disk is not ready!");
res = RES_NOTRDY;
break;
default:
res = RES_ERROR;
break;
}
}
return res;
}
/**
* @brief Reads Sector
* @param pdrv: Physical drive number
* @param *buff: Data buffer to store read data
* @param sector: Sector address (LBA)
* @param count: Number of sectors to read
* @retval DRESULT: Operation result
*/
DRESULT disk_read (BYTE pdrv, BYTE *buff, DWORD sector, UINT count)
{
DRESULT res = RES_ERROR;
MSC_LUNTypeDef info;
USBH_StatusTypeDef status = USBH_OK;
DWORD scratch [_MAX_SS / 4];
if ((DWORD)buff & 3) /* DMA Alignment issue, do single up to aligned buffer */
{
while ((count--)&&(status == USBH_OK))
{
status = USBH_MSC_Read(&hUSBHost, pdrv, sector + count, (uint8_t *)scratch, 1);
if(status == USBH_OK)
{
memcpy(&buff[count * _MAX_SS], scratch, _MAX_SS);
}
else
{
break;
}
}
}
else
{
status = USBH_MSC_Read(&hUSBHost, pdrv, sector, buff, count);
}
if(status == USBH_OK)
{
res = RES_OK;
}
else
{
USBH_MSC_GetLUNInfo(&hUSBHost, pdrv, &info);
switch (info.sense.asc)
{
case SCSI_ASC_LOGICAL_UNIT_NOT_READY:
case SCSI_ASC_MEDIUM_NOT_PRESENT:
case SCSI_ASC_NOT_READY_TO_READY_CHANGE:
USBH_ErrLog("USB Disk is not ready!");
res = RES_NOTRDY;
break;
default:
res = RES_ERROR;
break;
}
}
return res;
}
