Silicon Laboratories Stepper Machine Specifications download pdf (Page 42)

Mass Storage (MSD)

 Used for file transfer for memory sticks, etc.

 Bulk transfers used for data transport

 What do I need?

 Firmware side

 Firmware to detect and respond to Standard requests and the

Class specific requests

 Standard and class specific descriptors defined

 Typically SCSI interpreter is all that is needed, however, if access

to the file system is required by means other than the host USB

interface then a file system will also be required

 Host side

 File system access instructions such as fopen, fread, etc.

 Any OS application like Windows Explorer can access the device

The same rules apply to the Mass Storage Device Class (MSD). When

implementing mass storage (like a USB drive) there are several firmware

considerations and application trade-offs to consider. Use this class when you want

to arrange data as files in order to move and copy them easily to other locations.

Typically, a SCSI interpreter is used and all of the file system structure is

maintained on the host PC. This is equivalent to a USB flash drive and using

Windows Explorer to access the files. One consideration to using the mass storage

device class is whether or not file access is to be given to another port other than the

host. In that case the firmware will have to implement its own files system and

need to respond to commands like fopen, fclose etc.

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Silicon Laboratories Stepper Machine Specifications Page 42