The storage layer port must implement the API functions summarized in . You can start by referencing to the storage port template located under:
Micrium\Software\uC-USB-Device-V4\Class\MSC\Storage\Template
You can also refer to the RAMDisk storage and µC/FS storage located in Micrium\Software\uC-USB-Device-V4\Class\MSC\Storage\ for a more detailed example of storage layer implementation.
Please refer to the MSC Storage Layer Functions Reference for a full description of the storage layer API.