erasetes.asm

DOS下基于28f512的小型文件系统 format.asm/list.asm/erasetes.asm/readfl.asm/start.asm/writefl.asm

port_a  equ 0c800h
port_b  equ 0c801h
port_d  equ 0c803h
port_ce equ 0c810h
code    segment
        assume cs:code
start:  mov dx,port_d
        mov al,80h
        out dx,al 
        call format
        mov ah,4ch       ;return dos
        int 21h

format  proc
        xor di,di
        xor bx,bx
        mov cx,0ffffh
        mov dx,port_b   ;addressh
        mov al,bh
        out dx,al
        mov dx,port_a    ;addressl
        mov al,bl
        out dx,al
next_e1:mov dx,port_ce    ;erase cmd1
        mov al,20h
        out dx,al
        mov dx,port_ce    ;erase cmd2
        mov al,20h
        out dx,al
        call delay_e
next_e2:mov dx,port_b   ;addressh
        mov al,bh
        out dx,al
        mov dx,port_a    ;addressl
        mov al,bl
        out dx,al
        mov dx,port_ce    ;erase check
        mov al,0a0h
        out dx,al
        call delay
        mov dx,port_ce     ;read
        in al,dx
        cmp al,0ffh
        jz next_e3
        inc di
        cmp di,1000
        jnz next_e1
        jmp exit_e
next_e3:inc bx
        loop next_e2
exit_e: ret
format  endp

delay_e proc
        push cx
        mov cx,100h
bb:     mov di,8000h
aa:     dec di
        jnz aa
        loop bb
        pop cx
        ret
delay_e endp
delay   proc
        push cx
        mov cx,8000h
        loop $
        pop cx
        ret
delay   endp

code    ends
        end start