微機(jī)原理與接口技術(shù)8254電子發(fā)聲器-課程設(shè)計

一．試驗(yàn)名稱：發(fā)聲器二．功能及使用方法：設(shè)計一個電子琴發(fā)聲程序,并在運(yùn)行時通過試驗(yàn)箱上的揚(yáng)聲器發(fā)聲,1～14時,依1,2,3,4,5,6,71，2，3，4，5，6，7的中音。并在試驗(yàn)箱上的發(fā)聲器上發(fā)聲，這確定需要有發(fā)聲程序,驅(qū)動發(fā)聲程序,還有鍵盤掃描程序,及為了能夠聽見動聽的字符音還得對程序進(jìn)展8254芯片所供給轉(zhuǎn)化后的頻率送到發(fā)聲單元進(jìn)展發(fā)聲及8255芯片送供給的輸入輸出功能，來完成從鍵盤的輸入到發(fā)聲裝置發(fā)聲的掌握。電子發(fā)聲原理：一個音符對應(yīng)一個頻率，將對應(yīng)一個音符頻率的方波通到揚(yáng)聲器上，就可以發(fā)出這個音符的聲8254的“方計算如下：=輸入時鐘\輸出頻率1MHZ800HZ1000000/800。音符與表的比照關(guān)系如上表所示。對于每一個音符的演奏時間，可以通過軟件延時來處理。首先確定單位延時子程序〔依據(jù)CPU的頻率不同而有所變化。然后確定每個音符演奏需要幾個單位延時，將此值送入存放器，再調(diào)用延時子程序即可。三．試驗(yàn)器件：通過試驗(yàn)箱上的揚(yáng)聲器發(fā)聲,1～14時,1,2,3,4,5,6,71，2，3，4，5，6，7的中音。并在試驗(yàn)箱上的發(fā)聲器上發(fā)聲。選用器件：8254和8255芯片各一片，微機(jī)一臺，TPC-H通用微機(jī)接口試驗(yàn)系統(tǒng)一臺，揚(yáng)聲器和導(dǎo)線假設(shè)干四．電路連接圖：8254局部接線圖8255局部接線圖0五．各子程序功能1.82558254所定義的端口地址：I0Y0EQU06C0HMY8254_COUNT0EQUI0Y0+00HMY8254_COUNT1EQUI0Y0+02HMY8254_COUNT2EQUI0Y0+04HMY8254_MODEEQUI0Y0+06HMY8255_AEQU0640HMY8255_BEQU0642HMY8255_CEQU0644HMY8255_MODEEQU0646H2..頻率表及所對應(yīng)的時間表：FREQ_LISTDW262H,294H,330H,349H,392H,440H,496HDW523H,587H,659H,698H,784H,880H,988HDTABLEDB3FH,06H,5BH,4FH,66H,6DH,7DH,07HDB7FH,6FH,77H,7CH,39H,5EH,79H,71H3.82558254的掌握字MOVDX,MY8255_MODEMOVAL,81HOUTDX,ALMOVDX,MY8254_MODEMOVAL,36HOUTDX,ALCCSCAN子程序?qū)崿F(xiàn)取出按鍵值并輸入A口〔清屏子程序〕12CCSCAN:MOVAL,00HMOVDX,MY8255_AOUTDX,ALMOVDX,MY8255_CINAL,DXNOTALANDAL,0FHRETPlay輸動身音的子程序PLAYPROCMOVAH,0MOVSI,AXSHLSI,1MOVDX,0FHMOVAX,4240HDIVWORDPTR[SI]MOVDX,MY8254_COUNT0OUT DX,ALMOVAL,AHOUT DX,ALRETPLAYENDP延時子程序DALLYPROCD0:MOVCX,0010HD1:MOVAX,02HD2:DECAXJNZD2LOOPD1DECDLJNZD0RETDALLYENDP按鍵掃描功能COLUM:MOVAL,CHMOVDX,MY8255_AOUTDX,ALMOVDX,MY8255_CINAL,DXL1:TESTAL,01HJNZL2MOVAL,00HJMPKCODEL2:TESTAL,02HJNZL3MOVAL,04HJMPKCODEL3:TESTAL,04HJNZL4MOVAL,08HJMPKCODEL4:TESTAL,08HJNZNEXTMOVAL,0CHKCODE:ADDAL,CLCALLPLAYPUSHAXKON:CALLDALLYCALLCCSCANJNZKONPOPAXJMPBEGIN1六．源程序清單I0Y0EQU06C0HMY8254_COUNT0EQUI0Y0+00HMY8254_COUNT1EQUI0Y0+02HMY8254_COUNT2EQUI0Y0+04HMY8254_MODE EQUI0Y0+06HMY8255_AEQU0640HMY8255_BEQU0642HMY8255_CEQU0644HMY8255_MODEEQU0646HSTACK1SEGMENTSTACKDW256DUP(?)STACK1ENDSDATASEGMENTFREQ_LISTDW262H,294H,330H,349H,392H,440H,496HDW523H,587H,659H,698H,784H,880H,988HDTABLEDB3FH,06H,5BH,4FH,66H,6DH,7DH,07HDB7FH,6FH,77H,7CH,39H,5EH,79H,71HDATAENDSCODESEGMENTASSUMECS:CODE,DS:DATASTART:MOVAX,DATAMOVDS,AXMOVDX,MY8255_MODEMOVAL,81HOUTDX,ALMOVDX,MY8254_MODEMOVAL,36HOUTDX,ALBEGIN1:CALLCCSCANJNZINK1JMPBEGIN1INK1:CALLCCSCANJNZINK2JMPBEGIN1INK2:MOVCH,0FEHMOVCL,00HCOLUM:MOVAL,CHMOVDX,MY8255_AOUTDX,ALMOVDX,MY8255_CINAL,DXL1:TESTAL,01HJNZL2MOVAL,00HJMPKCODEL2:TESTAL,02HJNZL3MOVAL,04HJMPKCODEL3:TESTAL,04HJNZL4MOVAL,08HJMPKCODEL4:TESTAL,08HJNZNEXTMOVAL,0CHKCODE:ADDAL,CLCALLPLAYPUSHAXCALLCCSCANJNZKONPOPAXJMPBEGIN1NEXT:INCCLMOVAL,CHTESTAL,08HJZKERRROLAL,1MOVCH,ALJMPCOLUMKERR:JMPBEGIN1CCSCAN:MOVAL,00HOUTDX,ALINAL,DXNOTALANDAL,0FHRETPLAYPROCMOVAH,0MOVSI,AXSHLSI,1MOVDX,0FHMOVAX,4240H[SI]MOVDX,MY82