Bluetooth Gamepad
Bluetooth Gamepad
Human Interface Device
History
The primary motivations for HID were to enable innovation in PC input devices and simplify the process of installing these devices. Prior to HID, devices usually conformed to very narrowly defined protocols for mice, keyboards and joysticks (for example the standard mouse protocol at the time supported relative X and Y axis data and binary input for up to two buttons). Any innovation in hardware required overloading the use of data in an existing protocol or creation of custom device drivers and evangelization of a new protocol to application developers. By contrast all HID devices deliver self describing packages that may contain an infinite variety of data types and formats. A single HID driver on the PC parses the data and enables dynamic association of data I/O with application functionality. This has enabled rapid innovation and proliferation of new human interface devices.
The HID standard was developed by a working committee with representatives from several companies and the list of participants can be found in the “Device Class Definition for Human Interface Devices (HID)” document. The concept of a self describing extensible protocol was initially conceived by Mike Van Flandern and Manolito Adan working on a project named Raptor at Microsoft and independently by Steve McGowan working on a device protocol for Access Bus while at Forte. After comparing notes at a Consumer Game Developer Conference, Steve and Mike agreed to collaborate on a new standard for the emerging Universal Serial Bus.
Common HIDs
Keyboard
Mouse, Trackball, Touchpad, Pointing stick
Graphics tablet
Joystick, Gamepad, Analog stick
Webcam
Headset
Less common HIDs
Driving simulator devices and flight simulator devices have HIDs such as gear sticks, steering wheels and pedals.
Wired glove (Nintendo Power Glove)
Dance pad
Wii Remote
Surface computing device
Apple’s Sudden Motion Sensor(SMS) device in Macs.
Most operating systems will recognize standard USB HID devices, like keyboards and mice, without needing a special driver. When installed, a message saying that a “HID-compliant device” has been recognized generally appears on screen. In comparison, this message does not usually appear for devices connected via the PS/2 6-pin DIN connectors which preceded USB. PS/2 does not support plug-and-play, which means that connecting a PS/2 keyboard or mouse with the computer powered on does not always work. In addition, PS/2 does not support the HID protocol. A USB HID is described by the USB human interface device class.
Components of the HID protocol
In the HID protocol, there are 2 entities: the “host” and the “device”. The device is the entity that directly interacts with a human, such as a keyboard or mouse. The host communicates with the device and receives input data from the device on actions performed by the human. Output data flows from the host to the device and then to the human. The most common example of a host is a computer but some cell phones and PDAs also can be hosts.
The HID protocol makes implementation of devices very simple. Devices define their data packets and then present a “HID descriptor” to the host. The HID descriptor is a hard coded array of bytes that describe the device’s data packets. This includes: how many packets the device supports, how large are the packets, and the purpose of each byte and bit in the packet. For example, a keyboard with a calculator program button can tell the host that the button’s pressed/released state is stored as the 2nd bit in the 6th byte in data packet number 4 (note: these locations are only illustrative and are device specific). The device typically stores the HID descriptor in ROM and does not need to intrinsically understand or parse the HID descriptor. Some mouse and keyboard hardware in the market today are implemented using only an 8-bit CPU.
The host is expected to be a more complex entity than the device. The host needs to retrieve the HID descriptor from the device and parse it before it can fully communicate with the device. Parsing the HID descriptor can be complicated. Multiple operating systems are known to have shipped bugs in the device drivers responsible for parsing the HID descriptors years after the device drivers were originally released to the public. However, this complexity is the reason why rapid innovation with HID devices is possible.
The above mechanism describes what is known as HID “report protocol”. Because it was understood that not all hosts would be capable of parsing HID descriptors, HID also defines “boot protocol”. In boot protocol, only specific devices are supported with only specific features because fixed data packet formats are used. The HID descriptor is not used in this mode so innovation is limited. However, the benefit is that minimal functionality is still possible on hosts that otherwise would be unable to support HID. The only devices supported in boot protocol are
Keyboard Any of the first 256 key codes (“Usages”) defined in the HID Usage Tables, Usage Page 7 can be reported by a keyboard using the boot protocol, but most systems only handle a subset of these keys. Most systems support all 104 keys on the IBM AT-101 layout, plus the three new keys designed for Microsoft Windows 95. Many systems also support additional keys on basic western European 105-, Korean 106-, Brazilian ABNT 107- and Japanese DOS/V 109-key layouts. Buttons, knobs and keys that are not reported on Usage Page 7 are not available. For example, a particular US keyboard’s QWERTY keys will function but the Calculator and Logoff keys will not because they are defined on Usage Page 12 and cannot be reported in boot protocol.
Mouse Only the X-axis, Y-axis, and the first 3 buttons will be available. Any additional features on the mouse will not function.
One common usage of boot mode is during the first moments of a computer’s boot up sequence. Directly configuring a computer’s BIOS is often done using only boot mode.
HID definition of a device
According to the HID specification, a device is described, during the report mode, as a set of controls or group of controls. Controls are matched by a field containing the data, and another containing a usage tag. Each usage tag is described in the spec as the constructor suggested use of the data described in the report mode.
Other protocols using HID
Since HID’s original definition over USB, HID is now also used in other computer communication buses. This enables HID devices that traditionally were only found on USB to also be used on alternative buses. This is done since existing support for USB HID devices can typically be adapted much faster than having to invent an entirely new protocol to support mice, keyboards, and the like. Known buses that use HID are:
Bluetooth HID Bluetooth is a wireless communications technology. Several Bluetooth mice and keyboards already exist in the market place.
Serial HID Used in Microsoft’s Windows Media Center PC remote control receivers.
See also
Human-computer interaction
Pointing device
External links
The last HID 1.11 Specification
The last HID Usage Tables 1.12 Specification
The USB Implementers Forum on HID
Categories: Human-computer interactionHidden categories: Vague or ambiguous time
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