Posted on April 08, 2015 at 19:14I went deeper in the code trying to find where the error is being generated and I reached the following:
DRESULT USBH_read(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(&HOST_HANDLE, 0, 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(&HOST_HANDLE, 0, sector, buff, count);
}
if(status == USBH_OK)
{
res = RES_OK;
}
else
{
USBH_MSC_GetLUNInfo(&HOST_HANDLE, 0, &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;
}
If you look a little deeper, in the function called to obtain the error source (USBH_MSC_GetLUNInfo());
USBH_StatusTypeDef USBH_MSC_GetLUNInfo(USBH_HandleTypeDef *phost, uint8_t lun, MSC_LUNTypeDef *info)
{
MSC_HandleTypeDef *MSC_Handle = (MSC_HandleTypeDef *) phost->pActiveClass->pData;
if(phost->gState == HOST_CLASS)
{
USBH_memcpy(info,&MSC_Handle->unit[lun], sizeof(MSC_LUNTypeDef));
return USBH_OK;
}
else
{
return USBH_FAIL;
}
}
Anyone knows something which may help me?
Thanks in advance!
