Interlink Electronics VersaPad USB - Manual (Page 6)

USB VersaPad®
Integration Guide
www.interlinkelectronics.com
4
4.0 Features and Operation
The detailed features of VersaPad are given below.
4.1 USB
The module is fully USB 2.0 compliant and enumerates utilizing native O/S drivers as a HID
mouse with Left, Right, and Center-Click capability. The mouse can also be suspended by
the host, but the mouse cannot wake the host from suspend mode. No features of the
mouse are settable by the host via USB.
4.2 Software Driver
The USB VersaPad enumerates as a standard three-button HID-compliant mouse and
requires no additional driver. In the future, Interlink may provide a driver that adds
additional functionality and customization possibilities to the Windows standard mouse
behavior.
4.3 Touchpad and Mouse
The module is a resistive, 4-wire X-Y touchpad measured by a microcontroller. When not
touched, the touchpad appears to the microcontroller as an open switch. On a touch event,
the processor detects this 'switch closure' and begins to evaluate the touchpad through a
series of measurements. The processor 'oversamples' the touchpad to facilitate filtering
and processing of the mouse report.
4.4 VersaPad Features
4.4.1 Tap for Left-Click
A single tap gesture will be interpreted as a mouse left click at the position of the
cursor. Tap for left-click is enabled by default on the base design. Custom versions
can have tap features disabled.
4.4.2 Double Tap
A double tap gesture will be interpreted as a double mouse left click at the position of
the cursor. Double-tap is enabled by default on the base design. Custom versions can
have tap features disabled.
4.4.3 Tap and Drag
Double-tapping and maintaining contact with the touchpad on the second tap initiates
tap (left-click) and drag. Tap-and-drag is enabled by default on the base design.
Custom versions can have tap features disabled.
4.4.4 Drag Edge Lock
If a Tap and Drag is released near any edge of the touchpad, the drag will not be
released for three seconds. This allows the drag to be resumed without requiring
another double-tap. Drag edge lock is enabled by default on the base design. Custom
versions can have drag edge lock disabled.