Motorola simplefi Specifications download pdf (Page 28)

5.3 Software development

5.3.1 Accessing Windows file system from a remote embedded

environment

When this project was started it was comprehensible how to interface the

microcontroller to the MP3 decoder and how to manage the buffering of data, but it was

difficult to conceptualise how to interact with the Windows file system from the MP3

player. Not knowing how to transfer files, navigate or find the files, and then how to

open them, all from the remote device.

The original plan for the design is shown in figure 8.

MP3 decoder

Buffer

Networking

The player

Microsoft

Windows

Graphical

User interface

Figure 8 Early overall design

The plan was to have the MP3 player communicate with Windows to navigate through

the file system and gather information about the directory, network and file structure

and then send this information to be displayed on the graphical user interface (GUI).

The user could then use the GUI to view the available files and make file selections to

compile a play list. At this stage it was undecided where the GUI should be located but

in order for it to be portable it was decided that the player should be in between

Windows and the GUI with respect to communication. Therefore, for development

purposes, the GUI could be implemented on the PC and still be easily moved onto the

player in future revisions because the only communication it makes is with the player.

The main difficulty at this stage was considering how to interact with the Windows file

system from the player. After researching how this could be done, it was found that

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Motorola simplefi Specifications Page 28