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Assembly code for Stepper Motor

Sample code for Stepper Motor
Following code can be using for 8051 and 8052 ICs like: 89c51, 89c52, 89s51, 89s52, 89c2051.

 

;==========================================================
; Pin Definations
;==========================================================
motor1          equ     a2h     ;Motor          P2.2 - P2.5
motor2          equ     a3h
motor3          equ     a4h
motor4          equ     a5h
;==========================================================
; Main Program starts from here
;==========================================================

stepper:  clr motor1
                clr motor2
                clr motor3
                clr motor4

                mov 51h,#03h

stepper_loop:    setb motor1
                call delhalf
                clr motor1
                call delhalf

                setb motor2
                call delhalf
                clr motor2
                call delhalf

                setb motor3
                call delhalf
                clr motor3
                call delhalf

                setb motor4
                call delhalf
                clr motor4
                call delhalf

                djnz 51h,stepper_loop
                ret
;==========================================================
stepper_reverse: clr motor1
                clr motor2
                clr motor3
                clr motor4

                mov 51h,#03h

stepper_rev_loop:    setb motor4
                call delhalf
                clr motor4
                call delhalf

                setb motor3
                call delhalf
                clr motor3
                call delhalf

                setb motor2
                call delhalf
                clr motor2
                call delhalf

                setb motor1
                call delhalf
                clr motor1
                call delhalf

                djnz 51h,stepper_rev_loop
                ret
;=====================================================
;      	Program ENDS here
;=====================================================