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stepper motor problem

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cestudent

Mon Nov 10 2008, 03:56AM

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Joined: Mon Nov 10 2008, 03:46AM

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hello guyz
how r u all?

i have a problem while testing stepper motor
i wrote an assembly code to rotate the stepper motor for a Specific number of steps and then it should stop but the stepper is still moving!!! can u tell what to do coz i want to stop the stpper motor after the count=0 .
am using pic16f84a and 6 wire stepper motor

CODE:

 
; 

;******************************************************************* 

; NOTES: 

; 

; 

;       PORTBO= NORTH POLE 

;       PORTB1= EAST POLE 

;       PORTB2= SOUTH POLE 

;       PORTB3= WEST POLE 

;***************************************************************** 

PORTA      EQU     5

PORTB                      EQU     6

STATUS      Equ    3

TMR0      EQU   1

COUNT      EQU   0CH

COUNT1      EQU   0DH

INTCON      EQU   0BH

COUNTD      EQU   0FH

;****************************************************************** 

        LIST    P=16F84A

        org      0

        goto    START

;********************************************* 

DELAY   CLRF   TMR0

   MOVLW   .10

   MOVWF   COUNT

   BCF   STATUS,5

WAITA   BCF   INTCON,2

WAITB   BTFSS   INTCON,2

   GOTO   WAITB

   DECFSZ   COUNT,1

   GOTO   WAITA

   RETURN

   RETLW   0

;************************************** 

START

   BSF   STATUS,5 ;BANK1 

   MOVLW   B'00000000'      

   TRIS   PORTB               ; b0:b3 " stepper output " 

   MOVLW   B'00000011'      

   TRIS   PORTA    

   MOVLW   B'0000001'

   OPTION

   BCF     STATUS,5  ; BANK0 

   CLRF   PORTB

   MOVLW   .10

   MOVWF   COUNTD

LOOP1    

   BSF   PORTB,4

   CALL   DELAY

   MOVLW   .1

   MOVWF   PORTB

   CALL   DELAY

   MOVLW   .2

   MOVWF   PORTB

   CALL   DELAY

   MOVLW   .4

   MOVWF   PORTB

   CALL   DELAY

   MOVLW   .8

   MOVWF   PORTB

   BCF   PORTB,4

   DECFSZ   COUNTD

    GOTO   LOOP1

   BSF   PORTB,5

LL   NOP

   GOTO LL

   END

plzz help me

Ajay

Mon Nov 10 2008, 09:45AM

Rickey's World Admin

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Joined: Fri Feb 24 2006, 04:56AM

Posts: 4049
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CODE:

   BCF   PORTB,4

   DECFSZ   COUNTD

;    GOTO   LOOP1

;remove this instruction and try again.

   BSF   PORTB,5

LL   NOP

   GOTO LL

   END

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sashijoseph

Mon Nov 10 2008, 11:14AM

Registered Member #5870

Joined: Mon Feb 04 2008, 06:26PM

Posts: 651
Thanked 141 times in 134 posts

CODE:

BCF   PORTB,4

   DECFSZ   COUNTD

    GOTO   LOOP1

The DECFSZ instruction is missing an operand.
Change to...

CODE:

BCF   PORTB,4

   DECFSZ   COUNTD,1

    GOTO   LOOP1

Let there be music........

cestudent

Mon Nov 10 2008, 11:27AM

Registered Member #12089

Joined: Mon Nov 10 2008, 03:46AM

Posts: 16
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thanx alot Ajay & sashijoseph
am gonna check both codes and feed back with the results

cestudent

Tue Nov 11 2008, 09:58AM

Registered Member #12089

Joined: Mon Nov 10 2008, 03:46AM

Posts: 16
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the problem has been solved with disabling the watchdog timer

thanx guyz for ur help

Ajay

Wed Nov 12 2008, 11:25PM

Rickey's World Admin

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Joined: Fri Feb 24 2006, 04:56AM

Posts: 4049
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great

well my answer was wrong sorry.. i did not see your program properly.

[Topic moved to PIC Microcontroller Discussion]

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cestudent

Thu Nov 13 2008, 01:07PM

Registered Member #12089

Joined: Mon Nov 10 2008, 03:46AM

Posts: 16
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sorry guys i have an other problem

let me tell u what i do , i am doing lift project , in this code am using the input switches as floor requests and each floor request has specific number of steps and the lift should calculate the distance and the direction

but the problem when i tested the code the distance was wrong !!

maybe because i dont know how to tell the stepper motor to move for 30 steps for example or is there any calculation to do that in a correct way
here my code

CODE:

; 

;*******************************************************************

; NOTES: 

; 

;

;       PORTBO= NORTH POLE

;       PORTB1= EAST POLE 

;       PORTB2= SOUTH POLE

;       PORTB3= WEST POLE 

;*****************************************************************

PORTA           EQU     5

PORTB           EQU     6

STATUS          Equ     3

TMR0            EQU     1

COUNT           EQU     0CH

COUNT1          EQU     0DH

INTCON          EQU     0BH

COUNTD          EQU     20H

CURRENTCOUNT    EQU     21H

DISTANCE        EQU     22H

;******************************************************************

        LIST    P=16F84A

        __CONFIG 0x200B

        org     0

        goto    START

;*********************************************

DELAY   CLRF    TMR0

        MOVLW   .3

        MOVWF   COUNT

        BCF     STATUS,5

WAITA   BCF     INTCON,2

WAITB   BTFSS   INTCON,2

        GOTO    WAITB

        DECFSZ  COUNT,1

        GOTO    WAITA

        RETURN

        RETLW   0

;**************************************

START

        BSF     STATUS,5 ;BANK1

        MOVLW   B'00000000'              ; SET B0 , B1 ,B2,B3,AS OUTPUT  

        TRIS    PORTB   

        MOVLW   B'00001111'              ; SET A0 , A1 ,A2,A3,AS INPUT SWITCHES 

        TRIS    PORTA   

        MOVLW   B'0000001'

        OPTION

        BCF     STATUS,5  ; BANK0 

        CLRF    PORTB

        MOVLW   .0

        MOVWF   CURRENTCOUNT

loop1   BTFSS   PORTA,0         ; check for a floor1 request 

        goto    check1

        MOVLW   .0

        MOVWF   COUNTD

        GOTO    MAIN

check1  BTFSS   PORTA,1         ; check for a floor2 request 

        goto    check2

        MOVLW   .30

        MOVWF   COUNTD

        GOTO    MAIN

check2  BTFSS   PORTA,2         ; check for a floor3 request 

        goto    check3

        MOVLW   .50

        MOVWF   COUNTD

        GOTO    MAIN

check3  BTFSS   PORTA,3         ; check for a floor4 request 

        goto    check4

        MOVLW   .70

        MOVWF   COUNTD

        GOTO    MAIN

check4  goto    loop1   

MAIN

        MOVF    COUNTD,W

        subwf   CURRENTCOUNT,W   ; distanation is w 

        MOVWF   DISTANCE

        MOVF    COUNTD,W

        MOVWF   CURRENTCOUNT

        btfss   STATUS,0        ; test if the result is positive or negative 

        goto    UP

        goto    DOWN

UP      MOVLW   .8

        MOVWF   PORTB

        CALL   DELAY

        MOVLW   .4

        MOVWF   PORTB

        CALL    DELAY

        MOVLW   .2

        MOVWF   PORTB

        CALL    DELAY

        MOVLW   .1

        MOVWF   PORTB

        CALL    DELAY  

        DECFSZ  DISTANCE,1

        GOTO    UP

        GOTO    loop1

DOWN    MOVLW   .1

        MOVWF   PORTB

        CALL   DELAY

        MOVLW   .2

        MOVWF   PORTB

        CALL    DELAY

        MOVLW   .4

        MOVWF   PORTB

        CALL    DELAY

        MOVLW   .8

        MOVWF   PORTB

        CALL    DELAY  

        DECFSZ  DISTANCE,1

        GOTO    DOWN

        GOTO    loop1

END

waiting for ur replies guyz

[ Edited Thu Nov 13 2008, 01:23PM ]

cestudent

Fri Nov 14 2008, 06:27AM

Registered Member #12089

Joined: Mon Nov 10 2008, 03:46AM

Posts: 16
Thanked 0 times in 0 posts

any help ppl

ExperimenterUK

Fri Nov 14 2008, 12:55PM

Registered Member #9602

Joined: Tue Aug 05 2008, 04:15PM

Posts: 207
Thanked 38 times in 37 posts

You have routines UP and Down which presumably move the stepper one step either way.

Do they work ?
ie if you run UP 50 times, does it move 50 steps ?
if you run UP 50 times and then Down 50 times do you end up at the same place.?

If so, congratulations

your hardware works and
you have a way to measure floors , just decide how many loops of UP or Down is a floor.

The general layout of your program seems odd to me.
I would suggest something like,

Start
//Initialize variables
Main:

Read button:
call Check for button pressed //routine to read buttons..set new floor
call Calculate Distance and direction //routine to... guess what..
call Up_ Down loops //do a set number of loops
go to Read button. //Go round again

Use Calls and returns and less GOTOs

[ Edited Fri Nov 14 2008, 01:04PM ]

Learning all the time

cestudent

Sun Nov 16 2008, 06:11AM

Registered Member #12089

Joined: Mon Nov 10 2008, 03:46AM

Posts: 16
Thanked 0 times in 0 posts

thanx ExperimenterUK for ur help and advice
i have a question when I output .1 this means that the stepper has to move one step right ?

[ Edited Sun Nov 16 2008, 08:47AM ]