簡易邏輯分析儀

測控論文編號:CK082   論文字?jǐn)?shù):20430,頁數(shù):49

目 錄
摘要………………………………………………………………………………………………Ⅱ
Abstract………………………………………………………………………………………Ⅲ
目錄………………………………………………………………………………………………Ⅳ
1 緒論 ……………………………………………………………………………………1
 1.1  邏輯分析儀的定義 ……………………………………………………………………1
 1.2 邏輯分析儀的原理與功能…………………………………………………………2
 1.3　邏輯分析儀的主要技術(shù)指標(biāo) ………………………………………………………………3
 1.4  課題研究內(nèi)容…………………………………………………………………………4
2 主要芯片資料及系統(tǒng)總體設(shè)計(jì)…………………………………………………5
 2.1  AT89C52的主要資料…………………………………………………………………6
      2.2  可編程邏輯器件CPLD………………………………………………………………14
    2.3  數(shù)模轉(zhuǎn)換器DAC0832………………………………………………………………17
     2.4  系統(tǒng)方案論證…………………………………………………………………………19
      3 系統(tǒng)硬件電路設(shè)計(jì)…………………………………………………………………21
 3.1  8位數(shù)字信號發(fā)生器…………………………………………………………………21
    3.2  功能控制系統(tǒng)…………………………………………………………………………23
    3.3  數(shù)據(jù)采集電路………………………………………………………………………23
 3.4顯示系統(tǒng)………………………………………………………………………………23
4系統(tǒng)軟件設(shè)計(jì)………………………………………………………………………25
 4.1  信號發(fā)生器內(nèi)控制器的軟件流程圖…………………………………………………25
    4.2  采集系統(tǒng)的軟件流程圖………………………………………………………………26
 4.3  數(shù)據(jù)還原電路頂層框圖……………………………………………………………27
5 調(diào)試過程與結(jié)果分析………………………………………………………………29
 5.1  系統(tǒng)的測試……………………………………………………………………………29
          5.2  結(jié)果分析……………………………………………………………………………30
6 總結(jié)……………………………………………………………………………………32
致謝………………………………………………………………………………………………33
參考文獻(xiàn)………………………………………………………………………………………34
附錄一  單片機(jī)基本知識簡介…………………………………………………………36
附錄二  主要程序…………………………………………………………………………38

摘    要
 隨著未來電子系統(tǒng)應(yīng)用越來越多地采用多種總線結(jié)構(gòu)和多微處理器，邏輯分析儀也在向更多測試通道、更深存儲深度發(fā)展。在數(shù)字電路的調(diào)測過程中，往往要測量多路信號的波形，分析它們的邏輯關(guān)系。如果采用普通示波器，只能測量兩路波形，需要兩兩相測，再進(jìn)行分析才能得出多路波形之間的邏輯關(guān)系，非常麻煩。如果采用邏輯分析儀則投資較高，特別是在實(shí)驗(yàn)教學(xué)中難以承受。
 本文以單片機(jī)和CPLD為核心，輔以必要的外圍電路，構(gòu)成了一個(gè)簡易邏輯分析儀。介紹采用了AT89C52單片機(jī)設(shè)計(jì)的簡易邏輯分析儀的功能系統(tǒng)組成和軟硬件電路的設(shè)計(jì)方法，其主要模塊有任意可設(shè)定8路數(shù)字信號發(fā)生器、數(shù)據(jù)采集存儲電路、控制電路、波形還原顯示電路。最終設(shè)計(jì)的簡易邏輯分析儀，價(jià)格低，性能穩(wěn)定，具有一定的實(shí)用和推廣價(jià)值。
關(guān)鍵詞：AT89C52單片機(jī)；邏輯分析儀；信號發(fā)生器；CPLD
 

Abstract
 With the future development of electronic systems are increasingly using a variety of bus architecture and multi-microprocessors, logic analyzer also access to test more and deeper storage depth. Tune in the digital circuit testing process, It often need measured multi-channel signal, and analyze the logical relationship between them. If using the ordinary oscilloscope, we can only measure two waveforms, and need measure two-phase two, and then analyze multi-channel waveform in order to obtain t relationship between all logical. That’s very trouble.If using this logic analyzer,we need a high investment, especially in the experimental teaching.
 In this paper, as the core MCU and CPLD, we use necessary peripheral circuits to constitute a simple logic analyzer. this paper introduce design the simple functions of logic analyzer system software and hardware components and circuit design method using AT89C52 single-chip,and the main module consist of arbitrary 8-channel digital signal generator which can be set，data acquisition storage circuit, control circuit, and restoring the display circuit. Final design of simple logic analyzer has low prices, and stable performance,.So It has a certain degree of practical value.
Keywords: AT89C52 single-chip;logic tester;signal generator;CPLD