问题描述
我的问题是我编写了一个代码，应该将结果输出到一组连接到并行端口的 LED 中.当我运行代码时，它几乎什么也没做.我的导师告诉我，代码运行得太快了，我的眼睛没有看到发生了什么.
My problem is that I have written a code that is supposed to output a result into a set of LEDs connected to the parallel port. When I ran the code it pretty much did nothing. My instructor told me that the code ran too fast that my eyes did not see what happened.
我发现有几种方法可以进行时间延迟，我尝试循环 NOP，但我认为我无法真正确定发生了什么.有没有更好的办法?
I have found that there are a couple of ways to do a time delay, I have tried to loop the NOP but I think I cannot really determine what is going on. Is there any better way?
我在这里有一部分代码，我必须在其中添加时间延迟:
I have here a part of the code where I have to add a time delay into:
org 100h
mov ax, 0
mov dx, 378
out dx, ax
mov ax, 1
; 1st
mov cx, 1ah
start1st:
mov ax, 1
left:
out dx, ax
; --------------------------------> how to loop?
mov bx, 2
mul bx
cmp ax, 80h
jl left
dec cx
cmp cx,0
jg start1st
; end 1st
推荐答案
我最终使用的是 nop 循环
What i finally ended up using was the nop loop
; start delay
mov bp, 43690
mov si, 43690
delay2:
dec bp
nop
jnz delay2
dec si
cmp si,0
jnz delay2
; end delay
我使用了两个寄存器，我将它们都设置为任何高值它会继续循环，直到两个值都为零
I used two registers which I set them both to any high valueand its gonna keep on looping until both values go to zero
我在这里使用的是 AAAA 用于 SI 和 BP，我最终每个延迟循环大约需要 1 秒.
What I used here was AAAA for both SI and BP, i ended up with roughly 1 second for each delay loop.
感谢你们的帮助，是的，我们仍然使用 MS DOS 来学习这个汇编语言课程 :(
Thanks for the help guys, and yes, we still use MS DOS for this assembly language course :(
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