test.asm

单片机驱动步进电机代码（二） 适于各类单片机

public TRACK

ASMCODE segment code
    rseg ASMCODE

TRACK:
	MOV R6, #0FCH	;speed adjust
	MOV R7, #0FFH
	LCALL CST	;one step
   	CLR TR0		;delay
	MOV A, TL0
	ADD A, R6
	MOV TL0, A
	MOV A, TH0
	ADD A, R7
	MOV TH0, A
	SETB TR0
	RETI

CST:
	INC R0
	CJNE R0, #08H, CSTS
	MOV R0, #00H
  CSTS:				;look up in the table
	MOV A, R0 	
	MOV DPTR, #LNGI	
	MOVC A, @A+DPTR
	MOV P2, A
	RET

LNGI:	DB 0FEH,0FCH,0FDH,0F9H,0FBH,0F3H,0F7H,0F6H	;longitude table

   	END