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