/** * @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; }