Touch-screen system design based on P89LPC938 microprocessor

Based on the four-wire resistive touch screen works,the performance of microprocessors P89LPC938 analysis,a simple,efficient,stable,easy to use touch screen driver is designed.The improved system design is complicated touch-screen driven,so the touch screen driver is more simple and feasible.On this basis,the touch screen system hardware and software is designed.The design of the system hardware circuit simplification,and the direct use of P89LPC938 microcontroller A/D control touch screen reduces the cost.The software IO port special function and general functions are used to achieve the mutual conversion of the touch screen control.Experimental results show the feasibility and reliability of the system.