USB Libraries Help > USB Host Libraries > USB CDC Host Library > Using the Library > Library Overview
MPLAB Harmony USB Stack
Library Overview

The USB CDC Host Client Driver API is grouped functionally, as shown in the following table.

Library Interface Section 
Description 
Client Access Functions 
These functions allow application clients to open, close the client and register event handlers. These functions are implemented in usb_host_cdc.c
Data Transfer Functions 
These functions allow the application client to transfer data to the attached device. These functions are implemented in usb_host_cdc.c
CDC Class-specific Command Functions 
These functions allow the application to send class specific control transfer requests to the application. These functions are implemented in usb_host_cdc_acm.c