Browse Prior Art Database

TOUCH SCREEN ERROR DETECTION AND RECOVERY SYSTEM

IP.com Disclosure Number: IPCOM000026339D
Original Publication Date: 1991-Jun-30
Included in the Prior Art Database: 2004-Apr-05
Document File: 2 page(s) / 81K

Publishing Venue

Xerox Disclosure Journal

Abstract

In an electroreprographic system having a touch screen user interface, it is generally known to utilize a dual microprocessor system to control the user interface. For example, a first microprocessor may control the scanning of the user interface, while a second microprocessor may handle the remaining user interface tasks, such as sensing the user input. In such a system, the first and second microprocessors are generally able to communicate via a universal asynchronous receivedtransmitter (UART) or other such interface. In one embodiment of the present invention, there is also a reset line from the first microprocessor to the second microprocessor, thereby enabling the first microprocessor to reset the second microprocessor.

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XEROX DISCLOSURE JOURNAL

TOUCH SCREEN ERROR Proposed Classification DETECTION AND RECOVERY U.S. C1.355/205 SYSTEM Int. C1. G03g 21/00 James J. Dombrowski
Robert P. Ferraro
Mark F. Enzien

In an electroreprographic system having a touch screen user interface, it is generally known to utilize a dual microprocessor system to control the user interface. For example, a first microprocessor may control the scanning of the user interface, while a second microprocessor may handle the remaining user interface tasks, such as sensing the user input. In such a system, the first and second microprocessors are generally able to communicate via a universal asynchronous receivedtransmitter (UART) or other such interface. In one embodiment of the present invention, there is also a reset line from the first microprocessor to the second microprocessor, thereby enabling the first microprocessor to reset the second microprocessor.

The present invention utilizes a polling message, sent from the second microprocessor to the first microprocessor, to indicate that the second microprocessor is running normally, thus insuring a high level of confidence in the user interface touch screen response. Whenever the second microprocessor's polling messages are not received by the first microprocessor within a fixed time window, the first microprocessor will assume there is a fault with the second microprocessor and will pulse the reset line to reset the second microprocessor. Generally, this allow...