; Filename: STEPPER.SRC ; Author: Stephen Holland ; Revision: 1.0 ; Date: July 24, 1998 ; Part: SX28AC rev. 2.5 ; Freq: 50Mhz ; Compiled using Parallax SX-Key software v0.84 ; ; ;************************************************************* ; Device ;************************************************************* device pins18,pages4,banks8,oschs device turbo,stackx,optionx,carryx id 'STEPPER' reset reset_entry freq 50_000_000 ;************************************************************* ; Equates ;************************************************************* step_out = rb led_pin = ra.3 ;************************************************************* ; Variables ;************************************************************* org 8 temp ds 1 counter ds 1 ;************************************************************* ; Bank 0 variables ;************************************************************* org 10h timers = $ ;Timer variables timer_low ds 1 timer_mid ds 1 timer_high ds 1 timer_accl ds 1 timer_accm ds 1 timer_acch ds 1 timer_flag ds 1 ;************************************************************* ; Bank 1 variables ;************************************************************* org 30h motors = $ step_con ds 1 step_dividel ds 1 step_divideh ds 1 step_lo ds 1 step_hi ds 1 ;************************************************************* ; Interrupt routine - virtual peripherals ;************************************************************* org 0 interrupt ;3 it takes 3 cycles to get an interrupt ;************************************************************* ; Timers ;************************************************************* bank timers ;1 24-bit timer clc ;1 add timer_accl,timer_low ;2 sc ;1 jmp :timer_out setb timer_flag.0 ;1 ;834us delay timer add timer_accm,timer_mid ;2 sc ;1 jmp :timer_out setb timer_flag.1 ;1 ;213ms delay timer add timer_acch,timer_high ;2 snc ;1 setb timer_flag.2 ;1 ;54.6s delay timer movb led_pin,timer_acch.1 ;4 =10 :timer_out ;=7 ;************************************************************* ; Stepper Motor ; ; This routine excites the stepper motor using half-step sequence. ; The excitiation method can be changed by modifying the startstep ; lookuptable with the appropriate sequence of excite output. ; ; The stepper motor can be connected to portb via the following circuit: ; ; ULN2003 ; __________ To stepper ; rb.0----|1 16|-------------------coil 1 ; rb.1----|2 15|-------------------coil 2 ; rb.2----|3 14|-------------------coil 3 ; rb.3----|4 13|-------------------coil 4 ; -|5 12|- ; -|6 11|- ; -|7 10|- ; -----|8________9|---|<|-------------common ; | 12V Zener | ; ----- | ; --- ---- +12V ; - ; ; The stepper is controlled via the step_con register. The motor can ; be single stepped by setting the step_con.0 bit and run continuously ; by setting the step_con.1 bit. The rotation rate is set by modifying ; the step_lo and step_hi registers. To set the rotation rate, the ; following equation can be used: ; ; delay = desired rev per second/(RTCC*CLK^-1*steps) ; where: ; CLK = SX clock frequency ; steps = number of steps/rotation for stepper used ; (ie. 360degrees/7.5degrees per step = 48) ; ; step_lo * step_hi = delay ; ;************************************************************* stepper bank motors clc snb step_con.1 jmp :run sb step_con.0 jmp :stepper_out :run djnz step_dividel,:stepper_out ;3,2 ;64th time through? djnz step_divideh,:stepper_out ;3,2 ;127th time through? csae counter,#endstep ;1 take new table value jmp :continue1 ;1 mov counter,#startstep ;1 reload table-counter :continue1 mov w,counter ;1 mov m,#6 ;1 set page iread ;1 get table_data mov m,#$0f ;1 mov step_out,w ;1 inc counter ;1 mov step_dividel,step_lo mov step_divideh,step_hi clrb step_con.0 :stepper_out ;************************************************************* ; End of interrupt routine ;************************************************************* interrupt_out mov w,#-163 ;1 ;interrupt every 163 clocks retiw ;3 ;************************************************************* ; Reset entry ;************************************************************* reset_entry mov m,#$0f mov !ra,#%0100 ;set ra data direction register mov !rb,#%11110000 ;set rb data direction register clr fsr ;reset all ram banks :loop setb fsr.4 clr ind ijnz fsr,:loop bank timers ;set defaults setb timer_low.0 bank motors clr step_con mov !option,#%10011111 ;enable rtcc interrupt ;************************************************************* ; Main ;************************************************************* main mov temp,#6 ;Single step the motor 6 times main_loop bank motors setb step_con.0 bank timers ;Delay for approx. 1 second between steps clrb timer_flag.1 jnb timer_flag.1,$ clrb timer_flag.1 jnb timer_flag.1,$ clrb timer_flag.1 jnb timer_flag.1,$ clrb timer_flag.1 jnb timer_flag.1,$ clrb timer_flag.1 jnb timer_flag.1,$ djnz temp,main_loop bank motors ;Set revolutions for approx. 1 rev/s mov step_lo,#$ff mov step_hi,#$19 setb step_con.1 jmp $ ;************************************************************* ; Subroutines ;************************************************************* org $200 ;************************************************************* ; Data ;************************************************************* org $620 startstep = $ dw 1 ; 1 dw 3 ; 2 dw 2 ; 3 dw 6 ; 4 dw 4 ; 5 dw 12 ; 6 dw 8 ; 7 endstep = $ dw 9 ; 8
file: /Techref/SCENIX/lib/io/dev/stepper/STEPPER.SRC, 6KB, , updated: 2001/4/3 09:40, local time: 2024/8/14 14:44,
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Ashley Roll has put together a really nice little unit here. Leave off the MAX232 and keep these handy for the few times you need true RS232! |
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