Design And Application Of The LCD Screen Function Program Based On MCF52223

Touch screen is a new type of Human-Machine-Interface with a collective performance of mouse, keyboard and screen, which can not only show rich multimedia information, but also integrate touch pad and keyboard input function. It is very small , so especially suitable for embedded equipment and portable devices. With the rapid development of the embedded technology, touch screens are used in industrial control, automotive electronics and consumer electronics, etc.Based on the theory of software-and-hardware component, this paper is divided into USB component, power components, QSPI component and so on, which facilitates the peripheral parts in different project. In the hardware design, Freescale 32-bit MCF52223 mcu is chosen as the controller, RSM1843 as touch screen controller. In addition, the 4-wire resistive touch screen is adopted to achieve overall function. For software, this paper write drivers for components ,For touch screen generation system error and random errors, this paper analyze the algorithm of reducing random error based on statistical model, improve it and propose a algorithm of new recognition pen events and eliminating the effect of pen events in random errors based on statistical model, which include the judgment of resents, pen moves and carrying the pen, the eliminating of the phenomenon of "fly point", "jitter" and "bad-tail" and breakpoint data interpolation, etc. A lot of testing results in good effect. A set of touch screen with less errors, fast speed and sensitive touch is achieved.Finally, this paper presents the users with the use and effectiveness of the touch screen by means of a designed virtual oscilloscope, which embodies the guidance of component-based software and hardware design thought in specific project development.