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USB Mass Storage Device Using a PIC® MCU

From Microchip Technology, Inc.
 

 
In recent years, there has been immense growth in Universal Serial Bus (USB) based applications, primarily due to the Plug and Play nature of USB. This application note describes the design and implementation of a USB Mass Storage Device (MSD) using a Secure Digital card, which should prove useful to developers of USB mass storage solutions. This application may be used as a stand-alone MSD or as a Secure Digital/Multimedia Card (SD/MMC) reader/writer interface. A device endpoint is defined in the USB V2.0 specification as "a uniquely addressable portion of USB device that is the source or sink of information in a communication flow between the host and device" (see "References"). The unique address required for each endpoint consists of an endpoint number (which may range from 0 to 15) and direction (IN or OUT). The endpoint direction is from the host's perspective; IN is towards the host and OUT is away from the host. An endpoint configured to do control transfers must transfer data in both directions, so a control endpoint actually consists of a pair of IN and OUT endpoints that share an endpoint number. All USB devices must have Endpoint 0 configured as a control endpoint.
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