音乐发生器8086和8253通过Proteus仿真

音乐发生器8086和8253通过Proteus仿真_第1张图片
图中脉冲信号的频率为307.2KHz.
我这里实现了不同的乐曲分别是小星星,友谊地久天长和卖报歌,按下开关一是小星星,开关二是友谊地久天长,开关三是卖报歌:

DATAS SEGMENT
    ;此处输入数据段代码  
    IOYO equ 0C400h;对应的端口地址
    IOY1 equ 0C440h
    MY8253_COUNT_0 equ IOYO+00H*4;8254计数器0端口1地址
    MY8253_COUNT1 equ IOYO+01H*4;8254计数器1端口2地址
    MY8253_COUNT2 equ IOYO+02H*4;8254计数器2端口3地址
    MY8253_MODE equ IOYO+03H*4;8254控制器地址
    MY8255_A equ IOY1+00H*4;8255计数器端口1地址
    MY8255_B equ IOY1+01H*4;8255计数器端口2地址
    MY8255_C equ IOY1+02H*4;8255计数器端口3地址
    MY8255_MODE equ IOY1+03H*4;8254控制器地址
    TFREQ dw 264,264,396,396,440,440,396
    	  dw 352,353,330,330,297,297,264
    	  dw 396,396,352,352,330,330,297
    	  dw 396,396,352,352,330,330,297
    	  dw 264,264,396,396,440,440,396
    	  dw 352,352,330,330,297,297,264,0
    	  
    TDLY  dw 6000,6000,6000,6000,6000,6000,12000
    	  dw 6000,6000,6000,6000,6000,6000,12000
    	  dw 6000,6000,6000,6000,6000,6000,12000
    	  dw 6000,6000,6000,6000,6000,6000,12000
    	  dw 6000,6000,6000,6000,6000,6000,12000
    	  dw 6000,6000,6000,6000,6000,6000,12000
    	  
    TFREQ2  dw	371,495,495,495,624,556,495,556,624
			dw	495,495,624,742,833,833,833,742,624
			dw	624,495,556,495,556,624,495,416,416,371
			dw	495,833,742,624,624,495,556,495,556,833
			dw	742,624,624,742,833,990,742,624,624,495
			dw	556,495,556,624,495,416,416,371,495,0
			
    TDLY2 dw 6000,9000,3000,6000,6000,9000,3000,6000,6000
    	  dw 9000,3000,6000,6000,18000,1500,4500,9000
    	  dw 3000,6000,6000,9000,3000,6000,6000,9000
    	  dw 3000,6000,6000,18000,6000,9000,3000,6000
    	  dw 6000,9000,3000,6000,6000,9000,3000,6000
    	  dw 6000,18000,6000,9000,3000,6000,6000,9000
    	  dw 3000,6000,6000,9000,3000,6000,6000,18000
    	  
    TFREQ3  dw 525,525,525,525,525,525,441,525,589
    		dw 525,441,393,441,525,525,441,525
    		dw 441,393,350,441,393,441,441,393
    		dw 661,350,393,589,589,525,441,589
    		dw 525,525,441,393,441,525,525,441
    		dw 393,441,525,441,393,441,661,350
    		dw 393,441,350,0
    
    TDLY3 dw 3000,3000,3000,3000,3000,3000,3000,3000,3000
    	  dw 3000,3000,3000,3000,3000,3000,3000,3000
    	  dw 3000,3000,3000,3000,3000,3000,3000,3000
    	  dw 3000,3000,3000,3000,3000,3000,3000,3000
    	  dw 3000,3000,3000,3000,3000,6000,3000,3000
    	  dw 3000,3000,3000,3000,3000,3000,3000,3000
    	  dw 3000,3000,6000
DATAS ENDS

STACKS SEGMENT
    ;此处输入堆栈段代码
STACKS ENDS

CODES SEGMENT
    ASSUME CS:CODES,DS:DATAS,SS:STACKS
START:
    MOV AX,DATAS
    MOV DS,AX
    ;此处输入代码段代码
    mov dx,MY8255_B;输入信号
	in al,dx
    mov dx,MY8255_MODE
    mov al,82h;1000 0010
    out dx,al 
K:
	mov dx,MY8255_B;输入信号
	in al,dx
	cmp al,0FEh
	je K1
	cmp al,0FDh
	je k2
	cmp al,0FBh
	je k3
	;cmp al,0f7h
	;je k4
	;jmp Turn_out;熄灭
	jmp k
	
k1:
	mov dx,MY8255_A
    mov al,00h;门控位高电平允许计数
    out dx,al
	mov si,offset tfreq
	mov bx,offset tdly   
	call PlayMusic
	jmp k
k2:
	mov dx,MY8255_A
    mov al,00h;门控位高电平允许计数
    out dx,al
	mov si,offset tfreq2
	mov bx,offset tdly2
	call PlayMusic
	jmp k
k3:
	mov dx,MY8255_A
    mov al,00h;门控位高电平允许计数
    out dx,al
	mov si,offset tfreq3
	mov bx,offset tdly3
	call PlayMusic
	jmp k
PlayMusic proc near
FREQ:
	mov di,[si]
	cmp di,0
	je stop
	
	call sound
	add si,2;转到下一个音符
	add bx,2;转到下一个节拍
	jmp freq
stop:
    mov dx,MY8255_A
    mov al,01h;门控位低电平禁止计数
    out dx,al
    ret
playmusic endp	

sound proc near
	mov dx,MY8253_MODE;8253初始化
	mov al,0b6h;10通道211先读写高字节,后读写低字节011方式30二进制计数
	out dx,al
	mov dx,2
	mov ax,307;307.2KHz
	div di
	mov dx,MY8253_COUNT2
	out dx,al
	mov al,ah
	out dx,al
	mov ax,[bx]
sloop:
	mov cx,0018h;延时程序
	LOOP $
	dec ax
	jnz sloop
	ret	
sound endp		

exit:
	MOV AH,4CH
    INT 21H
CODES ENDS
    END START

在做改进部分的时候我发现一个问题,就是这个实验的切换,比如在两首乐曲之间进行切换的时候,一首乐曲的结尾一直发最后一个音,我觉得很奇怪,不是没有输入频率进去怎么还在发声,后来参考8253方式三,才发现原来问题在于只有GATE位为高电平,8253就会继续输出方波,后来我改进成了一首乐曲完成后GATE位输出低电平使8253停止输出波形,这样才改进好。这个问题可能大家也会遇到就提出来了。
这个程序参考了https://blog.csdn.net/weixin_30390075/article/details/97020412?utm_medium=distribute.pc_relevant_t0.none-task-blog-BlogCommendFromMachineLearnPai2-1.nonecase&depth_1-utm_source=distribute.pc_relevant_t0.none-task-blog-BlogCommendFromMachineLearnPai2-1.nonecase大家可以查看原文章。
补充:运行使使能信号:
音乐发生器8086和8253通过Proteus仿真_第2张图片
时钟信号设置:
音乐发生器8086和8253通过Proteus仿真_第3张图片

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