My current application(STM32f777NI) is using USB host library for USB flash stick.
I am using stm32cubef7 V1.12.0, now the appellation is stack after call "USBH_MSC_BOT_REQ_GetMaxLUN", and it appears that the usb stick is not response for this command.
I have some search in USB spec: https://www.usb.org/sites/default/files/usbmass-ufi10.pdf
here is the exact word:
3.2.2
Logical Unit Number
The Logical Unit Number field specifies the Logical Unit that shall process the command block.
Even though
SFF-8070i
states that the Logical Unit Number (LUN) at the block (packet) level will be made
obsolete in a future standard, block level LUNs are used by UFI command blocks because a control level LUN
does not exist. (The control level LUN is set in the ATAPI Block Device Select Register, which does not exist
on the UFI device.)
If the UFI device supports only one logical unit, its Logical Unit Number shall be zero. For other than the
INQUIRY command, if the UFI device detects a unsupported Logical Unit Number, the device shall abort the
command, setting the sense key shall be set to ILLEGAL REQUEST and the additional sense code to
LOGICAL UNIT NOT SUPPORTED
It looks like it is perfect valid for a device not response for the USBH_MSC_BOT_REQ_GetMaxLUN command, I have remove the like, and found usb stick with the FAT FS is working now.
Is this is a bug in the library or I have missed anything?
