【摘要】：隨著社會的發(fā)展和科學(xué)技術(shù)的創(chuàng)新，人們對于人機(jī)交互的要求越來越高，傳統(tǒng)的鼠標(biāo)，鍵盤等交互方式甚至于單點(diǎn)觸摸已經(jīng)不能滿足用戶，在這樣的情況下，多點(diǎn)觸摸技術(shù)應(yīng)運(yùn)而生。多點(diǎn)觸摸技術(shù)是在單點(diǎn)觸摸的基礎(chǔ)上發(fā)展而來的，該技術(shù)可以使用戶可同時控制的操作點(diǎn)擴(kuò)展到多個，甚至多個用戶同時使用。它使得操作更靈活，給用戶帶來一種前所未有的體驗(yàn)。 本文研究了一種基于STM32單片機(jī)多點(diǎn)觸摸的設(shè)計(jì)方法，對實(shí)現(xiàn)多點(diǎn)觸摸的坐標(biāo)運(yùn)算，HID設(shè)備通信等關(guān)鍵內(nèi)容進(jìn)行了研究，并在FPGA上實(shí)現(xiàn)CORDIC算法，為坐標(biāo)運(yùn)算打下了基礎(chǔ)。主要研究內(nèi)容有以下幾個方面： (1)采用成本比較低的數(shù)字圖像傳感器CMOS作為圖像采集器件，利用攝像頭交匯定位原理推導(dǎo)出坐標(biāo)運(yùn)算的公式，從而進(jìn)行坐標(biāo)運(yùn)算的算法設(shè)計(jì)，對觸摸點(diǎn)進(jìn)行準(zhǔn)確的定位，并在STM32單片機(jī)上實(shí)現(xiàn)。 (2)深入研究了CORDIC算法的原理，并對傳統(tǒng)的CORDIC算法進(jìn)行了改進(jìn)，在此基礎(chǔ)上利用FPGA實(shí)現(xiàn)了正弦函數(shù)與反正切函數(shù)的計(jì)算，此后對改進(jìn)的算法進(jìn)行仿真和結(jié)果的誤差分析，協(xié)助STM32單片機(jī)進(jìn)行觸摸坐標(biāo)的運(yùn)算。 (3)利用STM32芯片進(jìn)行USB接口電路的設(shè)計(jì)，研究了HID類設(shè)備的USB協(xié)議，包括USB設(shè)備的描述符、枚舉過程等，同時研究關(guān)于多點(diǎn)觸摸的微軟白皮書。在STM32單片機(jī)上實(shí)現(xiàn)USB的編碼測試，并進(jìn)行實(shí)驗(yàn)驗(yàn)證。將STM32單片機(jī)模擬成HID多點(diǎn)觸摸設(shè)備，搭載Windows系統(tǒng)的上位機(jī)進(jìn)行通信，將觸摸點(diǎn)信息傳給Windows操作系統(tǒng),以便Windows系統(tǒng)執(zhí)行下一步操作。 本文所設(shè)計(jì)的觸摸屏系統(tǒng)硬件成本低，，在尺寸需求增大的情況下成本增幅不大，因此在大尺寸觸摸屏上體現(xiàn)出來的性價比就比較高，并且在Window系統(tǒng)中能夠?qū)崿F(xiàn)即插即用，非常方便，具有一定的實(shí)用價值。
[Abstract]:With the development of society and the innovation of science and technology, people have higher and higher requirements for human-computer interaction. Traditional interactive methods such as mouse, keyboard and even single-point touch can not satisfy the user, under such circumstances, Multi-touch technology emerges as the times require. Multi-touch technology is developed on the basis of single point of touch. This technology can extend the operation points that users can control at the same time to multiple or even multiple users at the same time. It makes operations more flexible and gives users an unprecedented experience. In this paper, a design method of multi-touch based on STM32 single-chip microcomputer is studied. The key contents such as coordinate operation of multi-touch and communication of HID equipment are studied, and CORDIC algorithm is realized on FPGA, which lays a foundation for coordinate operation. The main research contents are as follows: (1) the digital image sensor CMOS, which has low cost, is used as the image acquisition device, and the formula of coordinate operation is deduced by using the principle of camera intersection and positioning. As a result, the algorithm of coordinate operation is designed, the touch point is located accurately, and it is realized on STM32 single chip microcomputer. (2) the principle of CORDIC algorithm is deeply studied, and the traditional CORDIC algorithm is improved. On this basis, the calculation of sine function and anti-tangent function is realized by FPGA. After that, the improved algorithm is simulated and the error analysis of the results is made. Assist STM32 single-chip microcomputer in the operation of touch coordinates. (3) the USB interface circuit is designed by using STM32 chip. The USB protocol of HID device is studied, including the descriptor of USB device, enumerating process and so on. At the same time, the Microsoft white paper about multi-touch is studied. The coding test of USB is realized on STM32 single chip computer, and the experiment is carried out. The STM32 single chip microcomputer is simulated as a HID multi-touch device, the upper computer with Windows system is used to communicate, and the touch point information is transmitted to the Windows operating system, so that the Windows system can perform the next operation. The hardware cost of the touch screen system designed in this paper is low, and the cost increase is not big when the size demand increases. Therefore, the ratio of price to performance on the large size touch screen is relatively high, and the plug and play can be realized in the Window system. It is very convenient and has certain practical value.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TP334.3

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