微机原理课程设计音乐跑马灯程序.doc

dseg segmentnum dw 0 num1 dw 0 data1 db 0FEh,0FDh,0FBh,0F7h,0EFh,0DFh,0BFh,7Fh data2 db 7Fh,0BFh,0DFh,0EFh,0F7h,0FBh,0FDh,0FEh data3 db 7Eh,0BDh,0DBh,0E7h,0E7h,0DBh,0BDh,7Eh data4 db 0fch,0f9h,0f3h,0e7h,0e7h,0cfh,09fh,03fhdata5 db 03fh,09fh,0cfh,0e7h,0e7h,0f3h,0f9h,0fchdseg endscode segment assume cs:code,ds:dseg start: mov ax,dseg mov ds,axmov dx,406hmov al,36hout dx,almov ax,20000mov dx,400hout dx,almov al,ahmov dx,400hout dx,al;初始化8253mov dx,0206h ;取8255A的控制端口的地址mov al,8bh ;初始化8255A的A口为输出模式，B口为输入模式,c输入 out dx,al mov dx,0200h ;取8255的端口A的地址mov al,0FFh ;使8255的PA0-PA7全为1out dx,al mov dx,0202h ;取8255的端口B的地址 in al,dx ;检测B口输入信号mov dx,0200h ;取8255的端口A的地址mov al,0FFh ;使8255的PA0-PA7全为1out dx,al ;使所有的灯LED全灭ledflash proc ;检测开关闭合,以便确定哪种闪烁方式 mov dx,0202h ;取8255A的端口B的地址 in al,dx ;检测B口输入信号choice1: cmp al,07eh jne choice2 mov si,offset data1 ;置第一种灯光变幻组合 jmp herechoice2: cmp al,07dh jne choice3 mov si,offset data2 ;置第二种灯光变幻组合 jmp herechoice3: cmp al,07bh jne choice4 mov si,offset data3 ;置第三种灯光变幻组合 jmp here choice4: cmp al,077h jne choice5 mov si,offset data4 ;置第四种灯光变幻组合 jmp here choice5: cmp al,06fh jne choice6 mov si,offset data5 ;置第五种灯光变幻组合 jmp here choice6:cmp al,05fhjne choice7mov al,0mov dx,0200hout dx,alchoice7: ;每盏灯亮完检测开关，如果停止开关没有按下跳到choice5 cmp al,07fh jne choice8 jmp exitchoice8: cmp num,0h;检测num是否为0，若为0扫描开关，若不为0继续执行 jne here jmp ledflash here: mov bx,num mov al,si+bx mov dx,0200h ;取8255的端口A的地址 out dx,al ;输出加电数据到端口A inc num ;改变数字变量的值 cmp num,09h je exit call delay jmp ledflashexit: mov num,0 jmp ledflash retledflash endpdelay proc neardl4: m