【摘要】：隨著技術的不斷進步，在計算機及相關設備中，觸摸屏開始逐漸取代鼠標-鍵盤等傳統(tǒng)輸入設備成為主流的人機交互方式。自蘋果公司發(fā)布iPhone和iPad系列產(chǎn)品之后，觸摸屏技術開始日益成熟。觸摸屏以其快捷的操作方式、靈敏的反應速度、簡潔的設計風格等眾多優(yōu)點開始在工業(yè)和生活中迅速普及。本文是基于FPGA技術實現(xiàn)的TFT觸摸屏的顯示和控制系統(tǒng)。選用Altera公司提供的DE0做為開發(fā)平臺，硬件主控FPGA芯片為平臺上颶風III EP3C16F484C6，通過DE0上GPIO口外接四線電阻式觸摸屏，然后采用SOPC進行軟硬件協(xié)同設計。在硬件方面對基本的硬件資源、ILI9325、ADS7843和SD卡各個端口的功能、特點和工作模式做了分析，并在SOPC Builder中對各個端口的詳細配置做了說明。在軟件驅(qū)動方面，使用C語言著手編寫了ILI9325、ADS7843和SD卡的驅(qū)動控制程序，并做了簡單控制界面開發(fā)。在軟件驅(qū)動設計中重點對觸摸屏書寫偏差，抖動以及散點的問題進行了深入研究。針對這些問題分別采用校正，，延時和濾波方法加以解決。同時對濾波算法進行改進，在采樣點數(shù)較少的情況下，仍能保證觸摸屏書寫的穩(wěn)定性和準確性。 在SOPC軟硬件協(xié)同設計下，實現(xiàn)了從SD卡中讀取圖片數(shù)據(jù)并在觸摸屏上顯示以及在觸摸屏上書寫的功能。同時，設計的軟件界面能夠控制圖片切換。從設計結果可以看出圖片顯示清晰，圖像切換迅速。在經(jīng)過延時和濾波處理后，可以看到散點基本消除、書寫平滑流暢。
[Abstract]:With the development of technology, touch screen has gradually replaced the traditional input devices such as mouse keyboard to become the mainstream of human-computer interaction in computer and related devices. Touch-screen technology has matured since Apple released its iPhone and iPad family of products. Touch screen with its quick operation, sensitive response speed, simple design style and many other advantages began to rapidly spread in industry and life. This paper is a TFT touch screen display and control system based on FPGA technology. The DE0 provided by Altera company is chosen as the development platform, the hardware master FPGA chip is used as the platform, and the hurricane III EP3C16F484C6, is connected to the four-wire resistive touch screen through the GPIO port on the DE0, and then the hardware and software co-design is carried out by using SOPC. In the aspect of hardware, the basic hardware resource, the function, characteristic and working mode of each port of ILI9325,ADS7843 and SD card are analyzed, and the detailed configuration of each port is explained in SOPC Builder. In the aspect of software drive, the driver control program of ILI9325,ADS7843 and SD card is written with C language, and the simple control interface is developed. In the design of software drive, the problems of writing deviation, jitter and divergence of touch screen are studied in detail. To solve these problems, correction, delay and filtering methods are adopted respectively. At the same time, the filtering algorithm is improved to ensure the stability and accuracy of touch screen writing. Under the co-design of SOPC software and hardware, the function of reading picture data from SD card and displaying it on touch screen and writing on touch screen is realized. At the same time, the software interface designed can control the picture switching. From the design results can be seen that the picture is clear, image switching quickly. After delay and filtering, you can see that the scattered point is basically eliminated and the writing is smooth and smooth.
【學位授予單位】：河北大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TP334.3

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