RTUSB-32 - Real-Time Embedded USB Host Stack

RTUSB-32 is an embedded systems USB stack. It contains the core protocol stack, the required host controller device drivers, a low-level communication API and high-level class drivers. Full source code is available. RTUSB-32 is suitable for implementing USB hosts, not USB devices.

Features

• USB 1.1 and 2.0
  Both USB versions currently in use are supported.
• UHCI, OHCI, and EHCI Host Controllers
  All major USB 1.1 and 2.0 host controller types are supported. These controller types are always supported, regardless of their respective vendor or model.
• Transfer Types Control, Bulk, Interrupt, and Isochronous
  All USB data transfer types/protocols can be used to support both high throughput and real-time oriented devices.
• Low-, Full-, and High-Speed Data Transfer
  Up to 12 Mb/s on USB 1.1 and 480 Mb/s on USB 2.0 buses are supported.
• No Copy
  RTUSB-32 does not copy data transferred to or from a device. Even if the buffers supplied by the application reside in the virtual address space, data transfers are always performed by DMA to/from the application's buffer. Even at very high data throughputs of up to 50 Mb/s, no CPU time is consumed to transfer the data.
• Plug-and-Play and Hot Plugging
  RTUSB-32 automatically detects devices and/or hubs being added and removed from the bus and can call application supplied callbacks for each event of such a type. The application can then decide whether to enable and operate the device or not. RTUSB-32 supplies functions to query a device's name, vendor, class, descriptors, interfaces, endpoints, etc.
• Class Drivers
  RTUSB-32 provides high-level class drivers for keyboards, mice, touch screens, printers, mass storage devices (disks, memory sticks, floppies, digital cameras, CD-ROMs, DVDs, etc.), and ASIX USB-Ethernet bridge devices. A hub class driver is integrated in the core USB protocol stack. Class drivers allow applications to use a device without being concerned about details, such as the transfer type and speed to use, etc. The source code of the class drivers is included with RTUSB-32. The mass storage device class driver requires a file system such as RTFiles-32. The USB-Ethernet bridge drivers need a network stack such as RTIP-32.
• Low-Level API
  RTUSB-32 also allows direct access to a device. An application can query a device's endpoints, supported transfer types and speeds, etc., and then communicate directly with the device. Thus, any USB 1.1 or 2.0 device can be used, even if no class driver is available or the device does not adhere to a standard USB class specification. Many examples are included with RTUSB-32 showing how an application can query and operate arbitrary USB devices.
• Asynchronous I/O
  RTUSB-32 performs I/O in the background. The application starts I/O operations and can then perform other tasks and query the status of the transaction at a later time. Any number of I/O transactions can be pending simultaneously. If two or more transactions are started on the same I/O pipe, a continuous data stream can be implemented with the application processing one buffer while the other is being transferred.
• Real-Time
  RTUSB-32 can call application supplied callbacks when data is received from an attached device. Depending on the transfer type, such callbacks can occur periodically or asynchronously with 1 millisecond (or even 125 microseconds on USB 2.0) resolution.
• Portable
  RTUSB-32 is preconfigured to work with On Time RTOS-32, but can easily be ported to any other system. All OS-dependent code is placed in a configuration header file and a linkable system driver with a simple and small API containing functions for port I/O, memory management, interrupt handling, etc. RTUSB-32 is completely written in ANSI C and supports little- and big-endian CPUs. It can be configured to ensure cache coherence in software, if required.

More information about RTUSB-32 is available in the free On Time RTOS-32 Evaluation Kit. If you are specifically interested in porting RTUSB-32 to a different platform, please have a look at the RTUSB-32 Evaluation Kit.

Structure of RTUSB-32

For more information please contact the MicroWay sales team:
Head Office MicroWay Pty Ltd PO Box 84, Braeside, Victoria, 3195, Australia Ph: 1300 553 313 Fax: 1300 132 709 sales@microway.com.au		Sydney Sales Office MicroWay Pty Ltd PO Box 1733, Crows Nest, NSW 1585, Australia Tel: 1300 553 313 Fax: 1300 132 709 sales@microway.com.au