# Shifting problem !

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#### MessUpMymind

##### New Member
hi there,

from my previous post http://www.electro-tech-online.com/threads/shifting-74ls164-is-not-working.93571/ i have solve the problem previous appeared and now i facing another problem ,

1)my data and shifting have gone well controlled but only when i shift 1 data and clear the shift register and send another data in it's visible.
OR
different data once in a row only , means data which show static but not shifting either to left or right.

what my objective is i wan to show a character out on the matrix that's shifting.

Code:
Start:	movlw	0xE0
movwf	dat1

movlw	0x50
movwf	dat2

movlw	0x58
movwf	dat3

movlw	0x50
movwf	dat4

movlw	0xE0
movwf	dat5

movlw	.5
movwf	shift

Run1:	movlw	0x01
xorwf	PORTB
call 	DELAY

movfw	dat1
movwf	col1
call	CLK
call	Shift

movfw	dat2
movwf	col1
call	CLK
call	Shift
call	DELAY

movfw	dat3
movwf	col1
call	CLK
call	Shift
call	DELAY

movfw	dat4
movwf	col1
call 	CLK
call	Shift
call	DELAY

movfw	dat5
movwf	col1
call 	CLK
call 	Shift
call	DELAY

Goto	Run1

DELAY					; common delay for all condition
MOVLW	d'50'
MOVWF	COUNT1
DELAY1
DECFSZ	COUNT2,1
GOTO	DELAY1
DECFSZ	COUNT1,1
GOTO	DELAY1
RETURN

Shift:	movfw	col4
movwf	col5

movfw	col3
movwf	col4

movfw	col2
movwf	col3

movfw	col1
movwf	col2

Return
CLK:	bsf	PORTC,1		;enable data pin

movfw	col1
GOTO	       Clock_Pulse
movfw	PORTD
movwf	col1

bcf	PORTC,1		;disable data pin

movfw	col2
GOTO	       Clock_Pulse
movfw	PORTD
movwf	col2

movfw	col3
GOTO	Clock_Pulse
movfw	PORTD
movwf	col3

movfw	col4
GOTO	Clock_Pulse
movfw	PORTD
movwf	col4

movfw	col5
GOTO	Clock_Pulse
movfw	PORTD
movwf	col5

RETURN

Clock_Pulse:
movwf	Col_Data	;save column data temporary storage
nop
movfw	Col_Data
movwf	PORTD
nop
nop
return

lend me a hand please if you have experience this =)..

##### Member
Hi,

GOTO Clock_Pulse?

Clock_Pulse:
'
'
'
'
return?

Do you mean Call Clock_Pulse?

Last edited:

#### be80be

##### Well-Known Member
what my objective is i wan to show a character out on the matrix that's shifting.
Messupmymind Tell me some thing do you think you can Light up a letter at a time? like shift a A out

#### MessUpMymind

##### New Member
hi angry,

ops sorry there should be clock pulse sending in.

hi be80be,

yes i can do it , but it will stay static there..there for now i wan some thing like

00000 00000 00000 00000 00000
00000 00000 10000 01000 00100
00000 10000 01000 00100 10010
10000 01000 00100 00010 00001
10000 11000 11100 11110 11111
10000 01000 00100 00010 00001
00000 00000 00000 00000 00000

and until the A is finish shifting , then next character come in.
sorry that my scratch is a bit messy

Last edited:
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