Method which provides debounced inputs from a touch screen panel

Details Method which provides debounced inputs from a touch screen panel Method which provides debounced inputs from a touch screen panel

1986-12-08

1991-06-18

Williams, Jr., Archie E.

Boots, shoes, and leggings

3649272, 3649276, 36492764, 364928, 364934, 364941, 3649411, 340706, G06F 3037, G06F 3033, G09G 116, G06K 1106

Patent

active

050254111

ABSTRACT:
A system for providing input to a computer comprises a touchscreen apparatus for generating a grid of horizontal and vertical light beams and producing a set of output signals, each indicating whether a corresponding one of the light beams strikes an object. A scanning device repeatedly scans the states of the output signals, stores data representing the last scanned state of each output signal, and transmits a first interrupt signal to the computer whenever the state of any one of the output signals changes. In response to the interrupt signal, the computer reads the stored scan data, determines whether the data indicates that a horizontal and a vertical light beam is striking an object, and if so, sets parameter values to identify the horizontal and vertical light beams. In response to a second interrupt signal periodically generated by a clock, the computer determines whether or not the parameter values have remained constant for a predetermined period, and if so executes a routine responsive to the parameter values.

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Ciarcia, S., "Chapter 5 the Basic Peripherals", in: Build Your Own Z80 Computer, (New Hampshire, Peterborough, 1981), pp. 130-134.

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