USB Stacks

Embedded USB stacks from Logic Technology 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 Stacks

USB Host

Logic Technology’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

Logic Technology’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.

AudioEnables device to act as microphone/speaker when connected to a USB host.
Audio 2.0Enables USB Audio 2.0 device to act as microphone and/or speaker when connected to a USB host.
CCIDChip Card Interface Device (CCID) – connects ICCs to a computer through an interface device like a card reader.
CP210xSilicon Labs® CP2102, CP2103, CP2105 and CP2109 USB devices.
CDC-ACMAbstract Control Model subclass – connects legacy serial ports or modems over USB link to host.
CDC-EEMEthernet Emulation Module – sends and receives Ethernet frames over USB.
CDC-ECMEthernet Control Module subclass – sends and receives Ethernet frames over USB.
CDC-NCMNetwork Control Model – provides serial interface for connecting high-speed, next-generation mobile devices.
RNDISRemote Network Driver Interface Standard – provides a virtual Ethernet link over USB.
FTDIFuture Technology Devices International USB devices.
HIDHuman Interface Device (HID) devices: keyboards, mice, and generic devices (pointers, buttons, sliders, etc.)
HubControls USB hubs.
LAN7500/LAN9500Microchip Technology Inc. LAN7500 and LAN9500 Ethernet Controllers.
Mass StorageConnects block storage devices over a USB link to a host.
MIDIMusical Instrument Digital Interface – controls musical devices connected to a host.
MTPMedia Transfer Protocol – for music, media and picture transfer.
Fujitsu FTP-6xx PrinterFujitsu FTP-6xx printers.
Raw or Vendor-specificSupports Bulk and Interrupt, IN and OUT transfers.
TEC ScannerEmulates a Toshiba USB barcode scanner.


Each class driver has specific features but the common features are:

  • Designed for integration with both RTOS and non-RTOS based systems.
  • Interface speeds include Low (1.5Mbs), Full (12Mbs), and High Speed (480Mbps). 
  • Transfer types include Control, Interrupt, Bulk, and Isochronous.
  • Supports multiple devices connected simultaneously.
  • Uses a system of callbacks for user-specified events.

Find suitable USB stacks for your next embedded project

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