基于簡單IO口的8LED語音播放機設計--畢業(yè)論文.doc

設計題目基于簡單IO口的8LED語音播放機設計任務要求實驗中需要的信源，可以通過處理一段WAV文件，將其變?yōu)橐欢螖?shù)據(jù)表進行實驗?；疽螅?、將處理過的數(shù)據(jù)通過單片機進行存儲（信號固化）。2、用D/A轉換器回放存儲的信號。3、通過模擬示波器顯示回放的波形。4、在數(shù)碼管或LCD上顯示回放波形的參數(shù)（最大/最小幅值，波形播放時間）。發(fā)揮部分：1、在實驗允許的條件下，采用更靈活的存放方法。2、多段信源管理和播放。實驗設備及軟件Keil 4編程軟件、Proteus 仿真軟件同組人員學號及姓名一人一組，無組員參考文獻郭天祥，新概念51單片機C語言教程入門、提高、開發(fā)、拓展全攻略，電子工業(yè)出版社，2009年1月基于簡單IO口的8LED語音播放機摘要本文介紹了語音播放機的設計。硬件部分是在Proteus 7.8上搭設的數(shù)字系統(tǒng)，軟件部分是基于AT89C51單片機的以Keil 4為編譯工具的C語言系統(tǒng)。本系統(tǒng)利用51單片機的IO口讀寫、控制DA0832、SRAM 6264的數(shù)據(jù)；往數(shù)碼管送段碼、位碼和控制信號；利用外部中斷實現(xiàn)2個按鍵的作用。本系統(tǒng)可以以設定程序生成的hex文件在Proteus中運行?？蓪崿F(xiàn)全部要求的功能，系統(tǒng)使用性強。關鍵詞：AT89C51 外部中斷 DA0832 SRAM總體設計原理及思路本系統(tǒng)的整體框圖由AT89C51構成主控芯片，并使用D/A轉換器以及存儲器等組成系統(tǒng)。首先通過處理一段WAV文件，將其變?yōu)橐欢螖?shù)據(jù)表，再通過單片機將數(shù)據(jù)鎖存到外部SRAM，然后由單片機控制將數(shù)據(jù)送到D/A輸出，即回放采樣數(shù)據(jù)；單片機串口讀取數(shù)據(jù)表，實時顯示在8位8段數(shù)碼管上；利用中斷原理，使用按鍵引發(fā)中斷、操控時間等。圖1 單片機原理框圖電路介紹（一）單片機AT89C5151單片機是對目前所有兼容Intel8031指令系統(tǒng)的單片機的統(tǒng)稱。該系列單片機的始祖是Intel的8031單片機，后來隨著Flash ROM技術的發(fā)展，8031單片機取得長足的進展，成為目前應用最廣泛的8位單片機之一，其代表型號是ATMEL公司的AT89系列，它廣泛應用于工業(yè)測控系統(tǒng)之中。目前很多公司都有51系列的兼容機型推出，在目前乃至今后很長的一段時間內都將占有大量市場。51單片機是基礎入門的一個單片機，還是應用最廣泛的一種。當前常用的51系列單片機主要產(chǎn)品有：Intel的：80C31、80C51、87C51、80C32、80C52、87C52等；ATMEL的：89C51、89C52等；Phillip、Dallas、Siemens等公司的許多產(chǎn)品。本次軟件設計中使用的是AT89C51。AT89C51是美國ATMEL公司生產(chǎn)的低電壓、高性能CMOS8位單片機，片內含4k bytes的可反復擦寫的只讀程序存儲器（PEROM）和128bytes的隨機存取數(shù)據(jù)存儲器（RAM），器件采用ATMEL公司的高密度、非易失性存儲技術生產(chǎn)，兼容標準MCS-51指令系統(tǒng)，片內置通用8位中央處理器（CPU）和Flash存儲單元，可靈活應用于各種控制領域。主要性能參數(shù)：與MCS-51產(chǎn)品指令系統(tǒng)完全兼容4k字節(jié)可重擦寫與Flash閃速存儲器1000次擦寫周期全靜態(tài)操作：0Hz-24MHz三級加密程序存儲器1288字節(jié)內部RAM32個可編程I/O口線2個16位定時/計數(shù)器6個中斷源可編程串行UART通道低功耗空閑和掉電模式圖2 AT89C51（二）DAC08322.1 背景知識根據(jù)分析，D/A轉換器的轉換速率不必嚴格等于采樣時的速率，可以選用一個固定的速率，只要不使LED顯示發(fā)生不正常的顯示即可；同時要求D/A轉換器的位寬為8，準確度要求盡可能地高，建立時間盡可能地小，因此選用DAC0832（轉換速率為1MHz），滿足要求。DAC0832是采樣頻率為8位的D/A轉換芯片，集成電路內有兩級輸入寄存器，使DAC0832芯片具有雙緩沖、單緩沖和直通三種輸入方式，以便適于各種電路的需要。它接收數(shù)字量，輸出一個與數(shù)字量相對應的電流或電壓信號的模擬量接口。D/A轉換結果采用電流形式輸出。要是需要相應的模擬信號，可通過一個高輸入阻抗的線性運算放大器實現(xiàn)這個功能。在實現(xiàn)D/A轉換時，主要涉及下面幾個性能參數(shù)：（1） 分辨率：是指最小輸出電壓（對應于輸入數(shù)字量最低位增1所引起的輸出電壓增量）和最大輸出電壓（對應于輸入數(shù)字量所有有效位全為1時的輸出電壓）之比。位數(shù)越多，分辨率越高。（2） 轉換精度：在不考慮D/A轉換誤差時，DAC轉換精度就是分辨率的大小。分為絕對和相對轉換精度。（3） 非線性誤差：被定義為實際轉換特性曲線與理想特性曲線之間的最大偏差，并以該偏差相對于滿量程的百分數(shù)度量。（4） 轉換速率/建立時間。轉換速率由建立時間來反映。建立時間是指數(shù)字量為滿刻度值時，DAC的模擬輸出電壓達到某個規(guī)定值時所需的時間。2.2 外部引腳 圖5 DAC0832的引腳圖（1） D0D7：數(shù)字信號輸入端（2） ILE（BY1/BY2）：輸入寄存器允許，高電平有效（3） CS：片選信號，低電平有效（4） WR1：寫信號1，低電平有效（5） XFER：傳送控制信號，低電平有效（6） WR2：寫信號2，低電平有效（7） IOUT1、IOUT2：DAC電流輸出端（8） Rfb：集成在片內的外接運放的反饋電阻（9） VREF：基準電壓（-1010V）（10） VCC：源電壓（+5+15V）（11） AGND：模擬地（12） NGND：數(shù)字地，可與AGND接在一起使用（仿真中只有一個接地）2.3 DAC0832外圍電路連接在本次課程設計中，DAC只需要處理SRAM鎖存的一路數(shù)字量，所以采用DAC0832的單緩沖工作方式。圖6 DAC0832的外圍電路這里使用51單片機的P27引腳控制DAC0832的片選段，P36引腳控制其WR1寫信號1端口。用D07接收來自6264緩存的數(shù)字量。這里的基準電壓取了-5V，主要是考慮到輸出波形反相的現(xiàn)象。將DAC0832輸出的模擬信號通過運放放大一下，輸出到模擬示波器的B通道。（三）靜態(tài)RAM62643.1 外部引腳6264是8K*8位的靜態(tài)隨機存儲器芯片，采用CMOS工藝制造，單一+5V供電，額定功耗200mW，典型存取時間200ns，28線雙列直插式封裝。 圖7 6264的外部引腳（1） A12A0：地址線，最大可尋址8KB的存儲空間（2） D7D0：數(shù)據(jù)線，雙向，三態(tài)（3） OE：讀出允許信號，輸入，低電平有效（4） WE：寫入允許信號，輸入，低電平有效（5） CE：片選信號1，輸入，在讀/寫方式為低電平（6） CS：片選信號2，輸入，在讀/寫方式為高電平（7） VCC：接+5V工作電壓（8） GND：信號地3.2 6264外圍電路6264的地址線一共13根，則除了P0口外，還需P2的5個端口。由于P0同時兼作數(shù)據(jù)口，為了避免邏輯混疊，我采用了74373鎖存器以鎖存P0首先發(fā)出的地址信息。圖8 6264外圍電路通過6264鎖存P0發(fā)出的地址信息后，再通過單片機控制WR，允許寫入，從D7D0端口讀取數(shù)據(jù)寫入SRAM內部。在設計中，我只使用了其中的512字節(jié)單元，一旦存滿之后單片機立即選中OE端為低電平，允許讀出，將SRAM內的數(shù)據(jù)發(fā)送給DAC0832。（四）數(shù)碼管顯示4.1 背景知識由于基于IO的示波器需要借用數(shù)碼管顯示采樣波形的電壓，考慮到基準電壓是+5V，而且需要顯示的數(shù)據(jù)較多（最大值/最小值和時間），所以我選用了八位數(shù)碼管，前四位用來顯示最值，后三位用來來顯示時間。集成數(shù)碼管都有8位段選位，分別為AG（分別對應各段線）和DP（對應右下側的點）。集成數(shù)碼管分為共陽和共陰兩種，在此我選用了共陰的數(shù)碼管。圖9 8位集成共陰數(shù)碼管4.2 數(shù)碼管的外圍電路為了使得段碼在逐位顯示過程中不會產(chǎn)生混亂的現(xiàn)象，按要求使用了74373鎖存器，用P35控制74373的LE端，決定何時讀入。由于數(shù)碼管有八個位選位，所以用了P10-P17作為位選位。連接電路圖如下所示。圖10 數(shù)碼管外圍電路圖在實際中，需要合理設置位選和段選的位置，否則會出現(xiàn)時序問題；還需要合理設置每位之間的延時時間，否則動態(tài)顯示效果會特別不好。（五）按鍵設置在本題中只有一個地方要用到按鍵，即“信源的播放”，再考慮到需要暫停，共需2個按鍵。我設置key1、key2，key1用于暫?；蚶^續(xù)播放，key2用于一開始的播放。同時分別用P30、P31口來連接按鍵key1、key2。 圖11 按鍵連接圖（六）整體電路圖12 整體仿真電路圖結合之前六個部分的元件，以AT89C51為核心控制器，分別控制DAC0832、SRAM6264、8位數(shù)碼管和鍵盤的運行。因為51單片機的IO口只有4組共32個，所以有必要統(tǒng)籌節(jié)約其使用。P0口作為輸入輸出口，需要加上拉電阻。軟件設計（一）主程序模塊主程序首先完成（1）變量的初始化；（2）開外部中斷0和1；（3）反復循環(huán)SARM送數(shù)據(jù)到DA、數(shù)碼管顯示程序。其中，系統(tǒng)初始化包括把數(shù)據(jù)存入SRAM中。圖13 主程序的流程圖（二）按鍵中斷模塊為使得每當按鍵按下都能得到程序的實時響應，我使用了外部中斷。按鍵1用于暫?；蚶^續(xù)播放，按鍵2用于最初的開始播放。圖14 按鍵中斷模塊的流程圖系統(tǒng)測試在Proteus中畫好仿真圖后，將Keil編譯生成的hex文件加載進AT89C51中，啟動仿真。其中前四位的最值會不停的跳變，最大值與最小值交替出現(xiàn)，當?shù)谝晃粸橄蛏系募^時，數(shù)值表示的為最大值，當?shù)谝晃粸橄蛳碌募^時，數(shù)值表示的為最小值。此外，為了顯示方便，我設置成30秒的循環(huán)播放。（1） 初始狀態(tài)，數(shù)碼管顯示都為0，模擬示波器沒有波形。圖15 初始狀態(tài)顯示（2） 點擊播放后，在4.0秒時刻的波形顯示（見示波器）及此時的最大值為149。圖16 4秒時刻顯示（3）點擊播放后，在15.0秒時刻的波形顯示（見示波器）及此時的最小值為12。圖17 15秒時刻顯示實驗心得在本次軟件設計中遇到了不少問題，比如說：數(shù)碼管動態(tài)顯示時位選隨機跳且不符合代碼、按鍵按下后不能觸發(fā)中斷程序、DA、SRAM地址分配的問題等等。在查資料、咨詢老師同學、自己聯(lián)調檢測下，我最終逐一克服了這些困難。其實大一寒假時自學過一點51，也能夠做一些簡單的工程，大二上學期還跟同學一起參加了“電子制作大賽”，期間做了一個電子琴，不過相隔那么久之后，很多已經(jīng)忘記，還好概念還有，所以學習起來較快。本次設計收獲最多的還是增強了自己解決問題的能力吧。從一開始百度怎么將protues7.8與keil4聯(lián)調，再到同學幫忙利用聯(lián)調解決了我的一個問題后，我能夠自己獨立調試檢測自己程序中的一些Bug，借此幫助自己、同學完成了課程設計。此外，我也在受同學幫助和幫助同學們中，受益匪淺，不僅提高了自己，也在幫扶中加深了同學們間的認識。總之，這次課程設計還是很成功的。非常感謝老師的指導、同學的幫助和自己的努力。代碼：/*基于簡單IO口的8LED顯示語音播放機設計程序*/#include#include/*宏定義*/#define uint unsigned int#define uchar unsigned char/*芯片端口地址定義*/#define DAC0832 XBYTE0XBFFF /DAC0832口uchar dis_buf8;uchar code du_code=0 xC0,0 xF9,0 xA4,0 xB0,0 x99,0 x92,0 x82,0 xF8,0 x80,0 x90, ; /8段共陽極數(shù)碼管顯示碼值 /*系統(tǒng)引腳定義*/sbit key1=P30; /key1sbit key2=P31; /key2/*定義系統(tǒng)變量*/uchar num=0,second=0; /定義時間變量bit flag1=0,flag2=0; /定義狀態(tài)標志位uchar count;uchar max=0,min=200; /定義幅值的最大值和最小值uint m_x=0 xe000;uchar code music=0 x80, 0 x81, 0 x80, 0 x80, 0 x80, 0 x80, 0 x80, 0 x80, 0 x80, 0 x80, 0 x80, 0 x80, 0 x80, 0 x80, 0 x80, 0 x80, 0 x80, 0 x80, 0 x80, 0 x80, 0 x80, 0 x80, 0 x80, 0 x80, 0 x80, 0 x80, 0 x80, 0 x80, 0 x80, 0 x7F, 0 x81, 0 x80, 0 x7F, 0 x82, 0 x7F, 0 x80, 0 x80, 0 x80, 0 x80, 0 x7F, 0 x81, 0 x80, 0 x80, 0 x81, 0 x7F, 0 x80, 0 x80, 0 x80, 0 x81, 0 x80, 0 x80, 0 x7F, 0 x81, 0 x80, 0 x80, 0 x80, 0 x7F, 0 x80, 0 x80, 0 x80, 0 x80, 0 x80, 0 x81, 0 x7F, 0 x82, 0 x7F, 0 x81, 0 x7F, 0 x80, 0 x81, 0 x7E, 0 x80, 0 x7F, 0 x82, 0 x7F, 0 x81, 0 x7F, 0 x80, 0 x81, 0 x80, 0 x82, 0 x7E, 0 x80, 0 x80, 0 x81, 0 x7E, 0 x81, 0 x7F, 0 x81, 0 x80, 0 x81, 0 x7F, 0 x80, 0 x7E, 0 x80, 0 x81, 0 x7E, 0 x81, 0 x80, 0 x80, 0 x81, 0 x81, 0 x7F, 0 x7F, 0 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