jieshou.asm

包含串行通行的收发程序、电子钟、AD、DA转换、LED按键显示等的源代码

data    segment
filer    db  'F:\lfb.txt ',0
handle    dw 0
buffer    db 2000 dup(0)
len    dw 1000
data    ends

stack    segment stack'stack'
    db 100 dup(0)
stack    ends

code    segment
    assume cs:code,ds:data,es:data,ss:stack
main    proc far

    mov ax,data
    mov ds,ax
    mov es,ax

    mov dx,3fbh                ;允许波特率访问并锁存被除数
    mov al,80h                 ;初始化
    out dx,al
    
    mov dx,3f8h                ;波特率因子寄存器3f8h
    mov al,80h
    out dx,al
    inc dx
    mov al,01h
    out dx,al                ;设置波特率300
    
    mov dx,3fbh                ;线路控制寄存器初始化
    mov al,00011010b
    out dx,al
    inc dx                      ;初始化moden
    mov al,00001011b
    out dx,al
    lea si,buffer

rece:    mov dx,3fdh
    in al,dx
    test al,01h
    jz rece                    ;检测到接收端数据就绪则开始接受

    mov dx,3f8h                
    in al,dx
    cmp al,1ah
    jz over                    ;若结束则跳over
    mov [si],al                ;一位一位接收并保存
    push ax
    mov bx,0
    mov ah,14
    int 10h
    pop ax
    inc len
    inc si
    jmp rece

over:    mov ah,3dh                ;打开文件
    mov al,1                        ;写文件
    lea dx,filer
    int 21h
    
    mov handle,ax
    mov ah,40h                  ;写文件
    mov bx,handle
    mov cx,len
    lea dx,buffer
    int 21h

    mov ah,3eh                  ;关闭文件
    mov bx,handle                    
    int 21h
    mov ah,4ch
    int 21h

main    endp
code    ends
    end main