微機課程設(shè)計電子琴-在線瀏覽
2024-08-09 13:23本頁面
【正文】 （分兩種水平、難易不等、即記錄按鍵，同時記錄按鍵和時間。二．基本設(shè)計思想先分別設(shè)計機內(nèi)電子琴和實驗儀電子琴。根據(jù)輸入的數(shù)字判斷應(yīng)顯示點陣的哪一行。同樣，根據(jù)輸入的數(shù)字判斷應(yīng)顯示哪一個LED燈。三．程序流程和程序?qū)崿F(xiàn)機內(nèi)電子琴開始流程圖：鍵盤讀入一個字符是ESC鍵嗎？YNN返回DOS是數(shù)字1~8鍵嗎？Y求出音階值保存賦相應(yīng)頻率值延時程序：8 / 13dseg segment freq dw 262,294,330,349,392,440,494,523 。Press 1,2,3,4,5,6,7,8,ESC:39。$39。顯示提示信息sss: mov ah,7 int 21h 。若為ESC鍵,則轉(zhuǎn)EXIT退出 cmp al,31h jl sss 。大于38h jg sss 。139。839。num求出相應(yīng)的時間常數(shù)的序號jinei: mov al,num add al,al mov ah,00h mov si,axagain: mov di,freq[si] mov bx,tim call gen jmp sssexit: mov ah,4ch int 21hgen proc near mov al,0b6h 。 DX AX=896*533h=18*65536+12928= div di out 42h,al 。讀8255PB口 mov ah,al or al,3 out 61h,alwait1: mov cx,0hdelay3: mov ax,10 。正弦波數(shù)據(jù)time db 120,106,94,89,79,70,63,59 。Press 1,2,3,4,5,6,7,8,ESC:39。$39。num為8253計數(shù)器初值的序號data endscode segment assume cs:code,ds:datastart: mov ax,data mov ds,ax mov dx,offset msg mov ah,9 int 21h 。從鍵盤接收字符,不回顯 cmp al,1bh je exit 。若不在39。39。之間轉(zhuǎn)sss sub al,31h mov num,al 。取60次32個正弦波數(shù)據(jù)ddd: mov si,0lll: mov al,data1[si] 。放音 call delay 。是否取完32個數(shù)據(jù) jl lll ?？傃h(huán)次數(shù)60是否完,沒有,則繼續(xù) jmp sssexit: mov ah,4ch int 21hdelay proc near 。置8253通道0為方式0工作 mov al,10h out dx,al mov dx,io8255b 。取相應(yīng)的時間常數(shù) xlat mov dx,io8253a out dx,al 。從8255A口讀一字節(jié) test al,01 。若不為1,則轉(zhuǎn)KKK ret 。8253通道0地址io8253b equ ioport+283h。8255A口地址io8255b equ ioport+289h 。8255控制字寄存器地址io0832a equ ioport+290hproth equ ioport+2a8h 。點陣列選的地址data1 db 80h,96h,0aeh,0c5h,0d8h,0e9h,0f5h,0fdh db 0ffh,0fdh,0f5h,0e9h,0d8h,0c5h,0aeh,96h db 80h,66h,4eh,38h,25h,15h,09h,04h db 00h,04h,09h,15h,25h,38h,4eh,66h。發(fā)不同音時8253的計數(shù)器初值banquan db 0dh,0ah db 39。,0dh,0ah db 39。,0dh,0ah db 39。,0dh,0ah db 39。,0DH,0AH db 39。,0DH,0AH db 39。,0dh,0ah db 39。,0dh,0ah db 39。,0dh,0ah
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