簡易邏輯分析儀設計

電氣自動化論文編號:ZD500 論文字數:14130,頁數:59，有開題報告，任務書，文獻綜述

目 錄

前言
簡易邏輯分析儀摘要…………………………………………………………………………………1
第一章  方案論證與比較……………………………………………………………………………3
 1.1 數字信號發生器………………………………………………………………………………3
 1.2 簡易邏輯分析儀………………………………………………………………………………3
 1.3 理論分析與計算………………………………………………………………………………6
第二章  簡易邏輯分析儀硬件設計………………………………………………………………7
 2.1 總體設計思路…………………………………………………………………………………7
 2.2 主要電路設計…………………………………………………………………………………7
 2.2.1 數字信號發生器…………………………………………………………………………7
 2.2.2 八位數據采集系統……………………………………………………………………13
 2.2.3 單片機系統………………………………………………………………………………13
 2.2.4 示波器顯示擴展電路……………………………………………………………………17
第三章  簡易邏輯分析儀軟件設計………………………………………………………………18
 3.1 主程序流程圖……………………………………………………………………………18
 3.2 按鍵讀值子程序流程圖…………………………………………………………………18
第四章  測試方法及步驟………………………………………………………………………19
 4.1 信號發生器測試…………………………………………………………………………19
 4.1.1 測試方法………………………………………………………………………………19
 4.1.2 測試步驟………………………………………………………………………………19
 4.2 簡易邏輯分析儀測試……………………………………………………………………19
 4.2.1 測試方法………………………………………………………………………………19
 4.2.2 測試步驟………………………………………………………………………………20
總結體會…………………………………………………………………………………………22
參考文獻 ………………………………………………………………………………………23
致謝……………………………………………………………………………………………23
附錄 一…………………………………………………………………………………………24
簡易邏輯分析儀整機電路圖……………………………………………………………………24
 附錄 二………………………………………………………………………………………27
簡易邏輯分析儀軟件程序 ……………………………………………………………………27

摘     要

 本系統完成了八位數字、可設置門限電壓的八位數字量采集通道、單片機系統和示波器顯示擴展電路的設計。數字信號發生器能夠產生八路預置的循環移位邏輯信號序列，輸出信號為TTL電平，序列時鐘頻率為100Hz，并能夠重復輸出；數字量采集通道具有采集八路邏輯信號的功能，八位輸入電路的輸入阻抗大于50KΩ，門限電壓可在0.25-4V范圍內按十六級變化，每通道的存儲深度增加到256Bit。單片機系統實現了以下功能：可設置單級、二級和三級觸發字；通過LCD點陣式液晶顯示時間標志線所對應時刻的八路輸入信號的邏輯狀態；選擇顯示觸發前、后所保存的邏輯狀態字數；移動光標、翻頁和顯示觸發點；通過串口與上位機通訊；示波器顯示擴展電路可以在模擬示波器上穩定顯示采集到的八路信號波形、顯示觸發點的位置和可移動的時間標志線，并實現了觸發位置可調的功能。系統經過測試，證明其功能強大，硬件設計合理，軟件運行良好。
 
 關鍵詞: 單片機  數字信號發生器  示波器  計算機  LCD  通信  
 
  
Simple Logic Analysis Instrument

Abstract
 This system completes design that eight data and can establish eight data of the threshold electric voltage collects the passage, the single chip computer system and the electric circuit for scope to expand. The digital signal generator produce eight roads prepare to place of circularly move logic signal, the output signal is TTL electric voltage, signal’s clock frequency is 100 Hz, and can repeat export; The amount of digital collects passage has function that collect eight road logic signal, the input resistance of eight input circuit over 50kΩ, the threshold electric voltage can change in 0.25-4V , the saving depth of the each passage increases to 256 bits. The single chip computer system realizes below functions: may establish single class, two classes and three classes trigger word; It displays the logic state word number of eight roads input signal that time marking line to proper to the time by point array type LCD; Choice logic state to keep to display before and behind triggering; Move the light marks and turn over the page with show to trigger point; The system communicates with PC computer by series port; Scope displays expand circuit may in imitate  scope stability displays eight roads signal wave of collect, displays the position that trigger point and move time marking line, and realizes to adjustable function in trigger position. The system by test, proof this system function is strong and big, the hardware design is reasonable, software run is good.

Keywords: single chip computer； digital signal generator； scope；PC computer；
LCD；communicate