USBX MSC *media_status value meaning

[ABasi.2]

Hello!

i'm developing a firmware that use an SD card connected to USBX MSC, and i have a couple of question

i want to understand better the  ULONG *media_status value returned in the function :

UINT USBD_STORAGE_Status(VOID *storage_instance, ULONG lun,
                         ULONG media_id,ULONG *media_status) 

UINT USBD_STORAGE_Flush(VOID *storage_instance, ULONG lun, ULONG number_blocks,
                        ULONG lba, ULONG *media_status)

UINT USBD_STORAGE_Write(VOID *storage_instance, ULONG lun, UCHAR *data_pointer,
                        ULONG number_blocks, ULONG lba, ULONG *media_status) 

UINT USBD_STORAGE_Read(VOID *storage_instance, ULONG lun, UCHAR *data_pointer,
                       ULONG number_blocks, ULONG lba, ULONG *media_status)                

 i'm hoping that value is related to the SCSI code value that windows need from a USB MSC

is it true? beyond UX_SUCCESS which value can i use? for example to indicate the media as changed  or is readonly?

how can the functions ULONG USBD_STORAGE_GetMediaLastLba(VOID) and ULONG USBD_STORAGE_GetMediaBlocklength(VOID) can be fired againafter initialization? (maybe i have changed the SD card)

whats the meaning of this function? 

UINT USBD_STORAGE_Notification(VOID *storage_instance, ULONG lun, ULONG media_id,
                               ULONG notification_class, UCHAR **media_notification,
                               ULONG *media_notification_length)

thank you!

best reguards

[FBL]

Hi @ABasi.2 

Checking USBX documentation I found  : media_status should be filled out exactly like the media status callback return value. Check here for further details.

The return value of your read/write/flush functions is only UX_SUCCESS or UX_ERROR. It could be UX_STATE_NEXT in standalone applications.

About USBD_STORAGE_Notification is not commonly used in simple applications. Its purpose to provide a buffer with notification data to the host.

[ABasi.2]

HELLO @FBL 

media_status should be filled out exactly like the media status callback return value and what does it mean? if i want to tell windows the media as changed? or if is now read only?

how to do that?

where the SCSI code are used?

The return value of your read/write/flush functions is only UX_SUCCESS or UX_ERROR. It could be UX_STATE_NEXT in standalone applications. ok for that, is the only "OK or error" return

About USBD_STORAGE_Notification is not commonly used in simple applications. Its purpose to provide a buffer with notification data to the host.

my isn't a "simple application" there is documentation about that?

i need to make a professional use of USBX msc , with using changed media , media in read only, ability to disconnect and reconnect the SD card , use of SCSI code ecc

there is a complex example or at least documentation about that?

thank you