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  1. What is a public USB called? - Knowledge

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    Device class definition relates to a functional interface used to access and con-trol a particular class of device. For example, Figure 21-1 on page 405 illustrates a USB CD-ROM device with two interfaces: mass storage and audio.
    USB communication There are many USB Device Classes like DFU (Device Field Upgrade), HID (Human Interface Device), and MSCD (Mass Storage Class Device). Because the MSCD class presents easy integration with a PC‘s operating system.
    The USB device storage class does not by itself provide a storage solution. It merely accepts and interprets SCSI requests coming from the host. When one of these requests is a read or a write command, it will invoke a pre-defined call back to a real storage device handler, such as an ATA device driver or a Flash device driver.
    USB communications device class (or USB CDC class) is a composite Universal Serial Bus device class. There are 4 difference USB device library classes inside the nRF52 SDK as below. This example uses the USB CDC ACM module.
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