In Internet Explorer, click Tools, and then click Internet Options. On the Security tab, click the Trusted Sites icon. Click Sites and then add these website addresses one at a time to the list: You can only add one address at a time and you must click Add after each one. Latest Drivers in Input Devices. Intel Wireless Bluetooth Driver 22.20.0 Intel Wireless Bluetooth is recommended for end users, including home users and business customers with Intel Wireless.

Tablet PC users rely on pen and touch input as primary methods of controlling applications and entering information. This section discusses the use of pen and touch input as substitutes for traditional pointing devices, such as the mouse.

Pen and touch input provide expressive, available, and socially acceptable methods of interacting with a mobile PC. When operating the computer in social environments, such as a lecture or meeting, users can silently take notes and interact with their Tablet PCs by using pen and touch input. In this way, pen and touch input provide a socially acceptable method of interacting with the computer in environments where typing could distract others.

Handwriting is made possible by the tablet pen. With the tablet pen, the user can perform other expressive activities, such as sketching, painting, and annotating, that are difficult to accomplish using a mouse or other traditional pointing devices. Also, pen and touch input enable the ultimate portability: freed from the desktop, you can use your Tablet PC anywhere that you want to take it.

The basic pen and touch interaction models in Windows Vista are discussed in Pen and Touch Input in Windows Vista. The other topics in this section explain how users can operate Windows Vista by using pen and touch input.

Summary recommendations

• Size the controls and forms appropriately for the input method that you're targeting (pen input, touch input, or both).
• Use common controls when possible, to take advantage of enhancements for pen and touch users.
• Look for ways to reduce cursor travel, such as shortcut menus and gestures.
• Make it easy for users to quickly access application functions that are commonly used in mobile PC environments such as meetings. Ideally, users should be able to access these important functions with a single tap of a tablet pen.
• For touch input applications, consider whether to use the touch pointer or to implement an interface that users can easily operate without the touch pointer.

Topics in this section

Related Topics

Build date: 2/8/2011

The Android input subsystem nominally consists of an event pipelinethat traverses multiple layers of the system.

Touch Input Devices Drivers

Input Pipeline

At the lowest layer, the physical input device produces signals thatdescribe state changes such as key presses and touch contact points.The device firmware encodes and transmits these signals in some waysuch as by sending USB HID reports to the system or by producinginterrupts on an I2C bus.

The signals are then decoded by a device driver in the Linux kernel.The Linux kernel provides drivers for many standard peripherals,particularly those that adhere to the HID protocol. However, an OEMmust often provide custom drivers for embedded devices that aretightly integrated into the system at a low-level, such as touch screens.

The input device drivers are responsible for translating device-specificsignals into a standard input event format, by way of the Linuxinput protocol. The Linux input protocol defines a standard set ofevent types and codes in the linux/input.h kernel header file.In this way, components outside the kernel do not need to care aboutthe details such as physical scan codes, HID usages, I2C messages,GPIO pins, and the like.

Next, the Android EventHub component reads input events from the kernelby opening the evdev driver associated with each input device.The Android InputReader component then decodes the input eventsaccording to the device class and produces a stream of Android inputevents. As part of this process, the Linux input protocol event codesare translated into Android event codes according to theinput device configuration, keyboard layout files, and variousmapping tables.

Finally, the InputReader sends input events to the InputDispatcherwhich forwards them to the appropriate window.

Control Points

There are several stages in the input pipeline which effect controlover the behavior of the input device.

Driver and Firmware Configuration

Input device drivers frequently configure the behavior of the inputdevice by setting parameters in registers or even uploading thefirmware itself. This is particularly the case for embeddeddevices such as touch screens where a large part of the calibrationprocess involves tuning these parameters or fixing the firmwareto provide the desired accuracy and responsiveness and to suppressnoise.

Driver configuration options are often specified as module parametersin the kernel board support package (BSP) so that the same drivercan support multiple different hardware implementations.

This documentation does attempt to describe driver or firmwareconfiguration, but it does offer guidance as to device calibrationin general.

Board Configuration Properties

The kernel board support package (BSP) may export board configurationproperties via SysFS that are used by the Android InputReader component,such as the placement of virtual keys on a touch screen.

Refer to the device class sections for details about how differentdevices use board configuration properties.

Resource Overlays

A few input behaviors are configured by way of resource overlaysin config.xml such as the operation of lid switch.

Here are a few examples:

Install Audio Input Device Driver

• config_lidKeyboardAccessibility: Specifies the effect of the lid switch on whether the hardware keyboard is accessible or hidden.

• config_lidNavigationAccessibility: Specifies the effect of the lid switch on whether the trackpad is accessible or hidden.

• config_longPressOnPowerBehavior: Specifies what should happen when the user holds down the power button.

• config_lidOpenRotation: Specifies the effect of the lid switch on screen orientation.

Refer to the documentation within frameworks/base/core/res/res/values/config.xmlfor details about each configuration option.

Key Maps

Key maps are used by the Android EventHub and InputReader componentsto configure the mapping from Linux event codes to Android event codesfor keys, joystick buttons and joystick axes. The mapping maybe device or language dependent.

Refer to the device class sections for details about how differentdevices use key maps. Tevii driver download for windows.

Input Device Configuration Files

Input device configuration files are used by the Android EventHub andInputReader components to configure special device characteristicssuch as how touch size information is reported.

Refer to the device class sections for details about how differentdevices use input device configuration maps. Team xecuter sx core.

Understanding HID Usages and Event Codes

There are often several different identifiers used to refer to anygiven key on a keyboard, button on a game controller, joystick axisor other control. The relationships between these identifiersare not always the same: they are dependent on a set of mapping tables,some of which are fixed, and some which vary based on characteristicsof the device, the device driver, the current locale, the systemconfiguration, user preferences and other factors.

A physical scan code is a device-specific identifier that is associatedwith each key, button or other control. Because physical scan codesoften vary from one device to another, the firmware or device driveris responsible for mapping them to standard identifiers such asHID Usages or Linux key codes.

Scan codes are mainly of interest for keyboards. Other devicestypically communicate at a low-level using GPIO pins, I2C messagesor other means. Consequently, the upper layers of the softwarestack rely on the device drivers to make sense of what is going on.

A HID usage is a standard identifier that is used to report thestate of a control such as a keyboard key, joystick axis,mouse button, or touch contact point. Most USB and Bluetoothinput devices conform to the HID specification, which enablesthe system to interface with them in a uniform manner.

The Android Framework relies on the Linux kernel HID drivers totranslate HID usage codes into Linux key codes and other identifiers.Therefore HID usages are mainly of interest to peripheral manufacturers.

A Linux key code is a standard identifier for a key or button.Linux key codes are defined in the linux/input.h header file usingconstants that begin with the prefix KEY_ or BTN_. The Linuxkernel input drivers are responsible for translating physicalscan codes, HID usages and other device-specific signals into Linuxkey codes and delivering information about them as part ofEV_KEY events.

The Android API sometimes refers to the Linux key code associatedwith a key as its 'scan code'. This is technically incorrect inbut it helps to distinguish Linux key codes from Android key codesin the API.

A Linux relative or absolute axis code is a standard identifierfor reporting relative movements or absolute positions along anaxis, such as the relative movements of a mouse along its X axisor the absolute position of a joystick along its X axis.Linux axis code are defined in the linux/input.h header file usingconstants that begin with the prefix REL_ or ABS_. The Linuxkernel input drivers are responsible for translating HID usagesand other device-specific signals into Linux axis codes anddelivering information about them as part of EV_REL andEV_ABS events.

A Linux switch code is a standard identifier for reporting thestate of a switch on a device, such as a lid switch. Linuxswitch codes are defined in the linux/input.h header fileusing constants that begin with the prefix SW_. The Linuxkernel input drivers report switch state changes as EV_SW events.

Android applications generally do not receive events from switches,but the system may use them internally to control variousdevice-specific functions.

Sureshotgps driver download. An Android key code is a standard identifier defined in the AndroidAPI for indicating a particular key such as 'HOME'. Android key codesare defined by the android.view.KeyEvent class as constants thatbegin with the prefix KEYCODE_.

The key layout specifies how Linux key codes are mapped to Androidkey codes. Different key layouts may be used depending on the keyboardmodel, language, country, layout, or special functions.

Combinations of Android key codes are transformed into character codesusing a device and locale specific key character map. For example,when the keys identified as KEYCODE_SHIFT and KEYCODE_A are bothpressed together, the system looks up the combination in the keycharacter map and finds the capital letter 'A', which is then insertedinto the currently focused text widget.

An Android axis code is a standard identifier defined in the AndroidAPI for indicating a particular device axis. Android axis codes aredefined by the android.view.MotionEvent class as constants thatbegin with the prefix AXIS_.

The key layout specifies how Linux Axis Codes are mapped to Androidaxis codes. Different key layouts may be used depending on the devicemodel, language, country, layout, or special functions.

Usb Input Device Driver Update

An Android meta state is a standard identifier defined in the AndroidAPI for indicating which modifier keys are pressed. Android meta statesare defined by the android.view.KeyEvent class as constants thatbegin with the prefix META_.

The current meta state is determined by the Android InputReadercomponent which monitors when modifier keys such as KEYCODE_SHIFT_LEFTare pressed / released and sets / resets the appropriate meta state flag.

The relationship between modifier keys and meta states is hardcodedbut the key layout can alter how the modifier keys themselves aremapped which in turns affects the meta states.

Usb Input Device Driver

An Android button state is a standard identifier defined in the AndroidAPI for indicating which buttons (on a mouse or stylus) are pressed.Android button states are defined by the android.view.MotionEventclass as constants that begin with the prefix BUTTON_.

The current button state is determined by the Android InputReadercomponent which monitors when buttons (on a mouse or stylus) arepressed / released and sets / resets appropriate button state flag.

The relationship between buttons and button states is hardcoded.

Touch Input Devices Driver

Further Reading