10] Design and develop an assembly program to drive a stepper motor interface and rotate the moto in the specified direction(clockwise or counter-clockwise) by N steps ( direction and N are specified by the examiner). Introduce suitable delay between successive steps. (Any arbitrary value may be assumed by the student).
10] Program code(lab10.asm)
.model large
.stack 100
.data
n equ 6
pa equ 0e880h
pb equ 0e881h
pc equ 0e882h
ctrl equ 0e883h
.code
mov ax,@data
mov ds,ax
mov dx,ctrl
mov al,80h
out dx,al
mov bh,n
up:mov al,0eeh
call step
mov al,0ddh
call step
mov al,0bbh
call step
mov al,077h
call step
dec bh
jnz up
mov ah,4ch
int 21h
step proc near
push bx
mov dx,pc
out dx,al
mov bx,0ffffh
again:mov cx,05fffh
agn:loop agn
dec bx
jnz again
pop bx
ret
step endp
end
