【導(dǎo)讀】以單片機作為主控核心，與鍵盤、揚聲器、LED顯示器等模塊組成核心。在主控模塊上設(shè)有11個按鍵，其中7個按鍵控制7個音符，1個。用來實現(xiàn)高、中、低音的音符發(fā)音。下面具體介紹一下單片機各端口的分配功能：?？刂齐娮忧賹崿F(xiàn)彈奏高、中、低的功能切換鍵；P0端口通過上拉電阻接到+5V上，管級基極相接，三極管的發(fā)射極又接蜂鳴器。管放大信號后驅(qū)動蜂鳴器發(fā)出不同音節(jié)的聲音。相應(yīng)的節(jié)拍變換為定時常數(shù)和延時常數(shù)，作為數(shù)據(jù)表格存放在存儲器中。頻脈沖的持續(xù)時間，這樣就可以實現(xiàn)樂曲的演奏。的方法，有效的解決了按鍵抖動的問題。動播放功能時，本系統(tǒng)能實現(xiàn)四首歌曲的有選擇播放，另附帶數(shù)碼管顯示提醒。這樣使得電子琴的功能變的更加強大。并經(jīng)過軟硬件的調(diào)試，該音樂發(fā)生器不但能通過鍵盤彈奏出很好的音調(diào)，而。能顯示哪個按鍵按下，而且相當準確。本系統(tǒng)運行穩(wěn)定，其優(yōu)點是硬件電路簡單，軟件功能完善，控制系統(tǒng)可靠，性價比較高等，具有一定的實用和參考價值。

　　

【正文】 RL A 。初始值為雙字節(jié)，偏移地址乘以 2 INC A 。偏移地址加一指向初始值低八位 MOVC A,@A+DPTR 。取頻率初始值低八位 POP DPH POP DPL ?；謴?fù) DPTR 的值 MOV TL0,A 。保存頻率初始值低八位 MOV STL0,A 。裝頻率初始值低八位 SETB TR0 。啟動定時器計時 W1: CLR 。句間暫停，蜂鳴器不發(fā)聲 LCALL DELAY30 。調(diào)用節(jié)拍延時時間 INC 40H 。節(jié)拍加一 LJMP MUSIC 。繼續(xù)播放 STOP: CLR TR0 。歌曲播放完畢，定時器停止計時 LJMP DIANGE 。轉(zhuǎn)向點歌程序 。********延時 10ms 子程序 ****** DELY10MS: MOV R6,20 河南理工大學(xué)本科課程設(shè)計報告 22 D3: MOV R7,248 DJNZ R7,$ DJNZ R6,D3 RETI 。*******T0 中斷服務(wù)子程序 ********** INT_T0: MOV TH0,STH0 MOV TL0,STL0 。重裝計數(shù)初值 CPL 。 取反 RETI 。******倒計 3 秒進入自動播放音樂子程序 ******** DISPLAY: MOV DPTR,TABLE0 MOV R0,0 LOOP10 : MOV A,R0 MOVC A,@A+DPTR MOV P0,A LCALL DELAY0 INC R0 CJNE R0,4,LOOP10 RET 。********延時 1s 子程序 ******** DELAY0: MOV R7,50 DELA: MOV R6,100 DEL12: MOV R5,100 DJNZ R5,$ DJNZ R6,DEL12 DJNZ R7,DELA RET 。*******延時子程序 DELAY******** DELAY30: MOV R7,02 D5: MOV R6,160 D6: MOV R5,248 DJNZ R5,$ DJNZ R6,D6 DJNZ R7,D5 河南理工大學(xué)本科課程設(shè)計報告 23 DJNZ R1,DELAY30 RET TABLE0: DB 4FH,5BH,06H,3FH 。倒計時 3 秒顯示碼 TABLE1: DW 65058,65110,65157,65178 。高音 DW 65217,65252,65283,65312 TABLE2: DW 64580,64684,64777,64820 。中音 DW 64898,64968,65030,65058 TABLE3: DW 63628,63835,64021,64103 。低音 DW 64260,64400,64524,64580 TABLE00: DW 64580,64684,64777,64820 。音樂播放頻率表 DW 64898,64968,65030,64260 DW 64400,64524,65058,63835,64021 。第一首《精忠報國》 TABLE10: DB 66H,52H,36H,22H,12H,12H,22H,32H,98H,84H,82H,92H,14H,12H,22H DB 32H,52H,22H,42H,38H,66H,52H,36H,22H,12H,22H,22H,32H,98H DB 24H,22H,32H,54H,52H,32H,92H,12H,92H,82H,98H,66H,52H,36H,22H DB 12H,12H,22H,32H,98H,84H,82H,92H,14H,12H,22H,32H,52H,22H,42H,38H DB 66H,52H,36H,22H,12H,22H,22H,32H,98H,24H,22H,32H,54H,52H,32H DB 22H,12H,92H,82H,98H,14H,24H,34H,44H,64H,0B4H,64H,32H,52H DB 62H,0B2H,62H,52H,38H,24H,22H,32H,54H,52H,62H,52H,32H,32H,22H,38H DB 64H,0B4H,64H,32H,52H,62H,0B2H,62H,52H,38H,22H,22H,22H,32H,52H,52H DB 52H,62H,7FH,74H,04H,58H,6FH DB 00 。第二首《月亮代表我的心》 TABLE20: DB 02H,82H DB 16H,32H,54H,02H,52H DB 0A6H,32H,54H,02H,52H DB 64H,74H,0B6H,64H DB 52H,5CH,32H,22H DB 16H,12H,14H,32H,22H DB 16H,12H,14H,22H,32H 河南理工大學(xué)本科課程設(shè)計報告 24 DB 26H,12H,94H,22H,32H DB 2CH DB 32H,52H DB 36H,22H,14H,54H DB 0ACH,92H,0A2H DB 96H,0A2H,96H,82H DB 3CH,54H DB 36H,22H,14H,54H DB 0ACH,92H,0A2H DB 16H,12H,14H,22H,32H DB 2CH,02H,82H DB 16H,32H,56H,12H DB 0A6H,32H,56H,52H DB 66H,72H,0B6H,62H DB 62H,52H,58H,32H,22H DB 16H,12H,14H,32H,22H DB 16H,12H,14H,22H,32H DB 26H,92H,0A4H,12H,22H DB 1CH DB 00H 。第三首《兩只蝴蝶》 TABLE30: DB 32H,22H,38H,02H,22H,32H,22H,18H,04H,92H,12H,24H,22H,32H,22H,12H,92H,92H,88H,04H,32H,22H DB 38H,02H,22H,32H,22H,18H,04H,92H,12H,24H,22H,32H,22H,21H,92H,12H,28H,04H,32H,22H DB 38H,02H,22H,32H,22H,18H,04H,92H,12H,24H,22H,32H,22H,12H,92H,91H,11H,88H DB 04H,32H,52H,58H,02H,52H,62H,52H,38H,04H,22H,22H,24H,22H,32H,22H,12H,92H,92H DB 12H,12H,1cH,08H,02H,52H,52H,62H,0b2H,72H,72H,62H,32H,22H,22H,22H DB 38H,02H,32H,32H,52H,64H,64H,02H,92H,32H,22H,28H,04H,32H,52H,52H,32H,54H,02H,0b4H,72H DB 62H,72H,34H,02H,62H,62H,72H,62H,52H,32H,22H,02H,32H,22H,32H DB 58H,02H,52H,52H,62H,0b2H,72H,72H,62H,32H,22H,22H,22H DB 38H,02H,32H,32H,52H,64H,64H,02H,92H,32H,22H,28H,04H,32H,52H,52H,32H,54H,02H,0b4H,72H 河南理工大學(xué)本科課程設(shè)計報告 25 DB 62H,72H,34H,02H,62H,62H,72H,62H,52H,32H,22H,02H,84H,92H,1cH DB 00H 。第四首《大?！? TABLE40: DB 82H,92H,12H,14H,12H,14H,92H,82H,12H,14H,22H,14H,92H,12H,22H,24H DB 22H,24H,12H,92H,22H,24H,32H,24H,32H,52H,62H,54H,52H,64H,52H,32H DB 22H,32H,22H,12H,94H,82H,92H,12H,14H,12H,14H,94H,1cH DB 82H,92H,12H,14H,12H,14H,92H,82H,12H,14H,22H,14H,92H,12H,22H,24H DB 22H,24H,12H,92H,22H,24H,32H,24H,32H,52H,62H,54H,52H,64H,52H,32H DB 22H,32H,22H,12H,94H,82H,92H,12H,14H,12H,14H,22H,12H,1cH,32H,52H DB 62H,64H,62H,64H,0b2H,62H,52H,54H,62H,54H,32H,22H DB 12H,14H,12H,14H,24H,3cH,32H,22H,12H,14H,12H,14H,0b2H,62H,52H,54H,62H,54H,32H,52H DB 66H,0b2H,0b4H,62H,52H,5cH,32H,52H,62H,64H,62H,64H,0b2H,62H,52H,54H DB 62H,54H,32H,22H,12H,14H,12H,14H,54H,3cH,32H,22H,12H,14H,12H,14H,22H,32H DB 52H,54H,32H,54H,32H,52H,6fH,04H,02H,92H,32H,24H,12H,1fH DB 00H END 河南理工大學(xué)本科課程設(shè)計報告 26 附 2 系統(tǒng)原理圖