USBX device storage, force windows to reload cached drive

[johvis71]

Hello Everyone
I was able to setup USBX and FileX on a RAMdisk. My STM microcontroller appears as a "drive" under windows. I can read and write to it. Perfect.
If the content of the ramdisk change from within the microcontroller, windows does not update the cached drive content. What is the correct way in USBX to make windows update the drive content? (without restarting USB completely)

Is there an example out there?

I experimented with USBD_Storage_Status, which is supposed to return SCSI sense Keys. I tried to reply "0x02 0x28 0x00" which is supposed to be "drive not ready, medium might have changed"
But this didn't help.

Thank you for your help.

Johannes

[johvis71]

Found it myself.
SCSI sense keys need to be 0x02 0x3A 0x00 (medium not present)

`
#define MEDIUM_NOT_PRESENT 0x00003A02
UINT USBD_STORAGE_Status(VOID *storage_instance, ULONG lun, ULONG media_id,
ULONG *media_status)
{
UINT status = UX_SUCCESS;

/* USER CODE BEGIN USBD_STORAGE_Status */
UX_PARAMETER_NOT_USED(lun);
UX_PARAMETER_NOT_USED(media_id);

switch(mediumState){
default:
case USBD_STORAGE_DISABLED:
status=MEDIUM_NOT_PRESENT;
break;
case USBD_STOARGE_REFRESHING:
status=MEDIUM_NOT_PRESENT;
mediumState=USBD_STORAGE_ENABLED;
break;
case USBD_STORAGE_ENABLED:
status=UX_SUCCESS;
}
media_status=status;
/ USER CODE END USBD_STORAGE_Status */

return status;
}`