USB OTG and Embedded Hosts

Every USB communication is between a host and a device. Devices can't communicate with each other directly. (An exception is USB 3.0's crossover cable for SuperSpeed host-to-host communications.) But not every USB host is a complete, general-purpose desktop or notebook computer.
The On-The-Go and Embedded Host Supplement to the USB Revision 2.0 Specification defines requirements for embedded systems that function as USB hosts, including USB On-The-Go (OTG) devices, which can function as both a device and as a scaled-back host (but not both at the same time).
My Projects | USB OTG | Chips | Code
The USB On-The-Go webpage has the specification and other information.

My Code



Linux code for accessing USB devices.
Touch screen data logger with flash drive and serial-port GPS interface. Uses the .NET Micro Framework and a ChipworkX board from GHI Electronics.

USB OTG

Understanding USB On-The-Go by Kosta Koeman (EDN).
USB On-The-Go Basics. From Dallas Semiconductor/Maxim.
USB On-The-Go: a Tutorial. From Philips Semiconductors. (PDF)
USB Multi-Role Device Design By Example by John Hyde. (PDF).

Chips

Chips with built-in support for host functions



The Vinculum II is a programmable microcontroller with an embedded host controller and an API for accessing devices. The VNC1L (Vinculum I) is a host controller that supports a command set for accessing USB devices via a UART, SPI, or parallel interface. From FTDI.
The USBwiz chip contains a host controller and built-in support for accessing mass-storage devices, HIDs, printers, and more. Microcontrollers can communicate with the USBwiz over a UART, SPI, or I2C interface. From GHI Electronics.
.NET Micro Framework modules with USB host support from GHI Electronics.

Microcontrollers with USB host ports

Cypress Semiconductor. Search the site for "USB host".
Freescale Semiconductor, Inc.
Microchip Technology PIC24 and PIC32 series.

USB host interface chips

PLX Technology
ST-Ericsson (chips originally from Philips)
Maxim Semiconductor MAX3421E. Not recommended for new designs.

Embedded PC

The Beagle Board has a high-speed OTG port and can run Linux and Windows Embedded.
Other sources for embedded PCs with USB host hardware are Digi International Inc. and EMAC, Inc.

Code

The AVR USB project is creating a software-only USB stack for Atmel's AVR devices and a matching driver for GNU/Linux.


The FHG_USBEHC Universal Serial Bus Host IP for embedded applications. From CorePool.
Nucleus RTOS includes real-time software components for USB hosts and devices. From Mentor Graphics.
Micro Digital has the smxUSBD USB Host Stack.
On Time Software's RTUSB-32 is a USB host protocol stack for embedded systems with full source code available.
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