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基于ARM7的嵌入式控制系統(tǒng)設(shè)計
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基于ARM7的嵌入式控制系統(tǒng)設(shè)計
摘要：以LPC2114微控制器為核心設(shè)計1個嵌入式系統(tǒng)，進(jìn)行了電源電路，復(fù)位電路，時鐘電路，JATG接口電路，打印電路，鍵盤電路，LCD顯示電路，PWM輸出電路，ADC電路設(shè)計，編寫了相應(yīng)的初始化程序，并進(jìn)行了系統(tǒng)調(diào)試。
CPU模塊是系統(tǒng)中最核心的部分，系統(tǒng)通過CPU處理數(shù)據(jù)，控制系統(tǒng)中的其他模塊，使其他模塊根據(jù)系統(tǒng)發(fā)出的指令工作并且使各個部分協(xié)調(diào)工作。電源模塊除了給CPU提供電源外，同時給其它各功能模塊也供電。復(fù)位電路為系統(tǒng)提供復(fù)位信號，以實(shí)現(xiàn)系統(tǒng)的初始化操作。通訊模塊主要實(shí)現(xiàn)通訊過程中的數(shù)據(jù)轉(zhuǎn)換。顯示模塊顯示系統(tǒng)運(yùn)行當(dāng)中的1些運(yùn)行結(jié)果。 鍵盤電路主要是通過按鍵控制程序的執(zhí)行，有時也作為參數(shù)實(shí)現(xiàn)1些簡單的數(shù)據(jù)輸入。
CPU處理的都是數(shù)字信號，而系統(tǒng)采集的1般是模擬信號，所以在輸入時必須進(jìn)行模數(shù)轉(zhuǎn)換，輸出時進(jìn)行數(shù)模轉(zhuǎn)換。因此在系統(tǒng)中設(shè)置了A/D轉(zhuǎn)換和D/A轉(zhuǎn)換模塊，系統(tǒng)利用PWM電路實(shí)現(xiàn)D/A轉(zhuǎn)換。 仿真器接口用來對程序進(jìn)行調(diào)試和固化。
關(guān)鍵詞：嵌入式系統(tǒng)；ARM；微處理器；電路設(shè)計；
The Design of The Embedded Control System Based on ARM7
Abstract：A embedded system is designed by taking the LPC2114 micro controller as the core. The system has carried on the power circuit, reposition, the electric circuit, the clock electric circuit, the JATG connection electric circuit, the marking circuit, the keyboard electric circuit, the LCD display circuit, the PWM output circuit and the ADC circuit design. It has also compiled the corresponding initialization routine and carried on the system debugging。
The CPU module is the core part of the system. The system processes the data and controls other modules through the CPU, which causes other modules working according to the instruction which is sent out by the system. The power source module not only provides the power source to CPU, but also supplies power to other various functions module. The rest electric circuit provides the replacement signal for the system so as to realize initialization operation of the system. The communication module mainly realizes the data conversion in the process of communication. Display module displays some movement result in the movement system. The keyboard electric circuits control the execution of procedure mainly through pressing the keys, and sometimes also as parameters to input some simple data.
The signals which CPU deals with are all digitals signals, but which the system gathers generally are simulated signals. Therefore we must carry on the A/D conversion when we input them and carry on the D/A conversion when we output them. So we have established the A/D transformation and the D/A transformation module in the system, the system realizes D/A transformation by using the PWM electric circuit .The simulation interface is used to debug and solidify the procedures.
Keywords: Embedded Systems; ARM; Microprocessor; Circuit design
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