Embedded USB stacks from HCC are mature, widely-used stacks that can support almost any desired USB configuration. The USB suite includes solutions not only for common functions like HID, Hub and Mass Storage but also for more sophisticated requirements including isochronous, composite devices, and interfaces to file systems and Ethernet. This means developers can exploit USB to its full capability easily, without having to worry about developing highly specialized drivers.

USB Host

HCC’s USB Host stack is a scalable suite. It includes a suite of host class drivers that enables an embedded host to control a variety of USB devices including pen-drives, printers, audio devices, joysticks, virtual serial ports and network interfaces. The embedded USB host stack supports EHCI, OHCI, and non-standard USB host controllers.

USB Device

HCC’s USB device stack allows developers to integrate USB device functionality into their embedded devices. It includes a suite of device class drivers that give the device many functional possibilities, including operating as a pen-drive, virtual serial port, joystick, audio system or a network card. HCC provides USB device controllers for many different microcontrollers.


In many cases, OTG software is not required. HCC provides the hooks for this configuration as standard. If required, HCC also provides a full software OTG stack that supports the SRP and HNP protocols to negotiate between two connected devices in order to decide which of them operates as the host.

All Speeds & Transfer Types

HCC USB comprehensively supports all USB End-point/Transfer Types and Interface Speeds including Low (1.5Mbs), Full (12Mbs) and High Speed (480Mbps). Transfer types include Control, Interrupt, Bulk, and Isochronous, providing the base for the widest possible range of class drivers.

The stacks provide support for multiple USB class functions to be used on the same device.

Composite, Compound & Complex Devices

HCC provides support for multiple USB class functions to be used on the same device.

Network Integration

HCC’s unique position as a middleware developer means that we can offer tight integration of file systems, serial and Ethernet interfaces to support communications between different protocols. Connecting different devices to a PC used to involve many hardware interfaces and protocols, for example Ethernet ports, serial ports, ATA/IDE interfaces, audio ports, video adapters and so on. HCC USB allows sharing of a single high speed bus by many peripheral types, connecting TCP/IP networks over USB interfaces either as local or remote network adapters.

HCC provides class drivers for RNDIS, CDC-ACM, CDC-EEM, CDC-ECM, CDC-NCM, CDC-FTDI, and Raw/Vendor-specific.

Apple MFi licensed technologies

As Apple MFi Program member, HCC can support customers with the development of USB drivers for MFi certified accessories.