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MSD class

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SEGGER emUSB-Host
  1. 1.Overview
    1. 1.1.Key features
  2. 2.Application Samples emUSB-Host MSD
  3. 3.Structure of MSD Component
  4. 4.Example Code Included
  5. 5.Requirements

Overview

The Mass Storage Device protocol (MSD) is used to get access to one or more storage mediums. Using this class, emUSB-Host provides access to external storage media such as USB-sticks and external hard disk drives, memory card adapters.

msd

Key features

  • Any Mass storage device (Memory stick, hard disk) can be used
  • Included in the emUSB-Host Base package
  • It is independent of the file system. An interface to emFile is provided
  • Small footprint

Application Samples emUSB-Host MSD

memory stick

Memory Stick

hard disk

USB Hard Disk Drive

card reader

Cardreader

Structure of MSD Component

A mass storage device connected to emUSB-Host is added to the file system as a volume. All operations on the device, such as formatting, reading / writing of files and directories are performed through the API of the file system. With emFile, the device name of the first MSD is "msd:0:".

emUSB host msd class structure graph

Example Code Included

Example code which is provided with any shipment or eval software including emUSB-Host. The example shows the capacities of the connected device (such as the volume size, number of sectors, etc.) and shows files in the root directory and creates and writes to a file. Several application samples can also be found on the emUSB-Host sample page.

Requirements

Components required to use emUSB-Host MSD:

  • emUSB-Host MSD (Included in emUSB-Host Base package)
  • emUSB-Host core (Included in emUSB-Host Base package)
  • emUSB-Host target driver (One driver is included in emUSB-Host PRO package)
  • Real-time operating system (embOS or other)
  • File System (emFile)

Resource usage

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