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AN58764 - Implementing a Virtual COM Port Using FX2LP™

Last Updated: 03/10/2014
Version: *G

AN58764 explains how to use a Cypress EZ-USB® FX2LP™ chip to implement the USB Communication Device Class (CDC). An FX2LP-based design can communicate with a PC as a standard COM (serial) device. This document contains example code with the required descriptors, code to handle class-specific requests, and the Windows information (INF) file required to enumerate the CDC device.


The Cypress EZ-USB® FX2LP™ is a Hi-Speed USB peripheral controller. The programmability and flexibility of FX2LP allows you to implement USB device classes such as the Communication Device Class (CDC), the mass storage class (MSC), and the human interface device (HID) class. This application note discusses the implementation of a virtual COM port device using FX2LP.


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Spec No: 001-58764; Sunset Owner: PRJI; Secondary Owner: HBM; Sunset Date: 06/15/20

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Spec No: 001-58764; Sunset Owner: PRJI; Secondary Owner: HBM; Sunset Date: 06/15/20