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Chapter 10
When you open the removable disk, if it is the first time the MSC device is connected to the
PC and is not formatted, Windows will ask to format it to handle files on the mass storage.
When formatting, choose the File System you want. In embedded systems, the most
widespread file system is the FAT.
10
If the mass storage device is a volatile memory such as a SDRAM, every time the target
board is switched off, the data of the memory is lost, and so is the file system data
information. Hence, the next time the target is switched on, the SDRAM is blank and
reconnecting the mass storage to the PC, you will have to format again the mass storage
device.
Once the device is correctly formatted, you are ready to test the MSC demo. Below are a
few examples of what you can do:
■
You can create one or more text files.
■
You can write data in these files.
■
You can open them to read the content of the files.
■
You can copy/paste data.
■
You can delete one or more files.
All of these actions will generate SCSI commands to write and read the mass storage device.
10-6 PORTING MSC TO A STORAGE LAYER
The storage layer port must implement the API functions summarized in Table 10-10. You
can start by referencing to the storage port template located under:
Micrium\Software\uC-USB-Device-V4\Class\MSC\Storage\Template
Please refer to section E-3 “MSC Storage Layer Functions” on page 434 for a full listing of the
storage layer API.
180
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