汇编语言之实现发出各种声音

软件：emu8086

语言：汇编语言（assembly)

注意：本文列出了响铃，机枪声音，音乐播放的代码，第一个代码为博主独自一人编写，所有代码都会有瑕疵，谨慎使用。

9.响铃设计

9.1设计要求：

要求掌握响铃的使用方法。设计程序，从键盘接收输入字符，如是数字n，则响铃n次，如输入为非数字，则不响铃。

9.2设计思路：

判断输入为0~9之间，将n值给bp，设置响铃延时次数cx输出n次响铃。

9.3程序清单：

data    segment
        pkey   db  0ah,0dh,'please input the n:','$'
        err   db  0ah,0dh,'eero!',0ah,0dh,'please input the n again:','$'
data    ends  

code    segment
        assume  cs:code,ds:data
state:  mov ax,data
        mov ds,ax
        mov es,ax 
        
        lea dx,pkey
        mov ah,09h
        int 21h                 ;dos功能调用，输出字符串

input:  mov ah,01h
        int 21h
        cmp al,'9'
        ja  eero
        cmp al,'0'
        jb  eero
        sub al,30h              ;输入为0~9,则al为响铃次数
        sub ah,ah
        mov bp,ax               ;bp为响铃次数n
        
xiang:   mov cx,4                ;cx为响铃延时时间
        mov ah,02h              
        mov dl,07h
        int 21h                 ;dos功能调用，响铃 
lp:     loop lp                 ;响铃延时
        dec bp  
        jnz xiang               ;响铃n次
        jmp state                
                
eero:    lea dx,err
        mov ah,9
        int 21h                 ;输出错误字符串
        jmp input

code   ends

end  state

9.4程序运行结果及分析：

设置cx次数为延时次数，bp次数为响铃次数，调用响铃功能通过延时实现响铃，起初会把延时次数和响铃次数混淆导致错误。

图9 响铃设计结果

10.需要外接扬声器的发声程序

10.1机枪声音

program segment  
    
main proc far
        assume cs:program
        
        org 100h
strat:mov cx,20d

new_shot:push cx
         call shoot
         mov cx,4000h 
         
silent:loop silent
       pop cx
       loop new_shot
       int 20h 
       
main endp    

shoot proc near  
    
      mov dx,140h
      mov bx,20h
      in  al,61h
      and al,11111100b 
      
sound:xor al,2
      out 61h,al
      add dx,9248h
      mov cl,3
      ror dx,cl
      mov cx,dx
      and cx,1ffh
      or cx,10    
      
wait: loop wait 

       dec bx
       jnz sound
       and al,11111100b
       out 61h,al
       ret      
       
shoot endp   

program ends 

end strat

10.2音乐播放

;定义数据段

data segment
     infor1 db 0dh, 0ah, "welocom you to come here listeng! $"
     mus_freg  dw 330,294,262,294,3 dup (330)     ;频率表
               dw 3 dup (294),330,392,392
               dw 330,294,262,294,4 dup (330)
               dw 294,294,330,294,262,-1
     mus_time  dw 6 dup (25),50                   ;节拍表
               dw 2 dup (25,25,50)
               dw 12 dup (25),100
data ends
;栈段定义
stack segment stack
      db 200 dup(?)
stack ends
;--------字符串输出宏----------
showbm macro b
     lea dx,b
     mov ah,9
     int 21h
 endm
;----------音乐地址宏-----------
address macro a,b
     lea si,a
     lea bp,ds:b
endm
;代码段定义
code segment
     assume ds:data, ss:stack, cs:code
start:
     mov ax, data
     mov ds, ax
     mov ax, stack
     mov ss, ax
     mov sp, 200   
     address mus_freg, mus_time
     call music
exit:     
     mov ah, 4ch
     int 21h
;------------发声-------------
gensound proc near
     push ax
     push bx
     push cx
     push dx
     push di
     mov al, 0b6h
     out 43h, al
     mov dx, 12
     mov ax, 348ch
     div di
     out 42h, al
     mov al, ah
     out 42h, al 
     in al, 61h
     mov ah, al
     or al, 3
     out 61h, al
wait1:
     mov cx, 3314
     call waitf
delay1:
     dec bx
     jnz wait1
     mov al, ah
     out 61h, al
     pop di
     pop dx
     pop cx
     pop bx
     pop ax
     ret 
gensound endp

;--------------------------
waitf proc near
      push ax
waitf1:
      in al,61h
      and al,10h
      cmp al,ah
      je waitf1
      mov ah,al
      loop waitf1
      pop ax
      ret
waitf endp
;--------------发声调用函数----------------
music proc near
      xor ax, ax
freg:
      mov di, [si]
      cmp di, 0ffffh
      je end_mus
      mov bx, ds:[bp]
      call gensound
      add si, 2
      add bp, 2
      jmp freg
end_mus:
      ret
music endp
code ends
     end start

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