Discussion in "8051 Discussion Forum" started by    [email protected]    Oct 5, 2019.
Sat Oct 05 2019, 10:43 AM
#1
Dear Sir

I want to Scroll message on (8x32) 4 dot matrix display using max 7219,but i m only scroll on one dot matrix display, below is my code, max 7219 dout pin not giving serial out data.


LOAD EQU P1.2
DIN EQU P1.1
CLK EQU P1.0
KEYPAD EQU P2
K_A EQU P2.0
K_B EQU P2.1
K_C EQU P2.2
K_D EQU P2.3
K_P EQU P2.4

MAIN: ACALL INIT
MOV DPTR,#TABLE
MOV R4,#224
NEXTC: MOV R3,#8

REPEAT: MOV R1,#0
MOV R0,#1
NEXT:
MOV A,R0

ACALL SEND_A
MOV A,R1
MOVC A,@A+DPTR

ACALL SEND_D
INC R1
INC R0
aCALL DELAY
MOV P2,#0FFH
CJNE R1,#8,NEXT

DJNZ R3, REPEAT
INC DPTR
DJNZ R4, NEXTC
SJMP MAIN
INIT: ;SHUT DOWN SETTING
MOV A,#0CH
ACALL SEND_A
MOV A,#01h
ACALL SEND_D
; DISPLAY TEST
MOV A,#0FFH
ACALL SEND_A
MOV A,#01H
ACALL SEND_D
; DECODE MODE SETTING
MOV A,#09H
ACALL SEND_A
MOV A ,#00H
ACALL SEND_D
; SCAN LIMIT
MOV A,#0BH
ACALL SEND_A
MOV A,#07h
ACALL SEND_D
; INTENSITY
MOV A,#0AH
ACALL SEND_A
MOV A,#04H
ACALL SEND_D
RET

SEND_A: MOV R7,#8
CLR LOAD
BACK: CLR CLK
RLC A
MOV DIN,C
SETB CLK
DJNZ R7,BACK
RET
SEND_D: MOV R7,#8
BACK1: CLR CLK
RLC A
MOV DIN,C
SETB CLK
DJNZ R7,BACK1
SETB LOAD
RET
TABLE:

DB 00H,00H,00H,00H,00H,00H,00H,00H
DB 3EH, 48H, 88H, 48H, 3EH, 00H ;A
DB 0FEH, 92H, 92H, 92H, 6CH, 00H ;B
DB 7CH, 82H, 82H, 82H, 44H, 00H ;C
DB 0FEH, 82H, 82H, 44H, 38H, 00H ;D
DB 0FEH, 92H, 92H, 92H, 82H, 00H ;E
DB 0FEH, 90H, 90H, 90H, 80H, 00H ;F
DB 7CH, 82H, 92H, 94H, 5EH, 00H ;G
DB 0FEH, 10H, 10H, 10H, 0FEH, 00H ;H
DB 00H, 82H, 0FEH, 82H, 00H, 00H ;I
DB 04H, 02H, 82H, 0FCH, 80H, 00H ;J
DB 0FEH, 10H, 28H, 44H, 82H, 00H ;K
DB 0FEH, 02H, 02H, 02H, 02H, 00H ;L
DB 0FEH, 40H, 30H, 40H, 0FEH, 00H ;M
DB 0FEH, 20H, 10H, 08H, 0FEH, 00H ;N
DB 7CH, 82H, 82H, 82H, 7CH, 00H ;O
DB 0FEH, 90H, 90H, 90H, 60H, 00H ;P
DB 7CH, 82H, 8AH, 84H, 7AH, 00H ;Q
DB 0FEH, 90H, 98H, 94H, 62H, 00H ;R
DB 64H, 92H, 92H, 92H, 4CH, 00H ;S
DB 80H, 80H, 0FEH, 80H, 80H, 00H ;T
DB 0FCH, 02H, 02H, 02H, 0FCH, 00H ;U
DB 0F8H, 04H, 02H, 04H, 0F8H, 00H ;V
DB 0FCH, 02H, 1CH, 02H, 0FCH, 00H ;W
DB 0C6H, 28H, 10H, 28H, 66H, 00H ;X
DB 0E0H, 10H, 0EH, 10H, 0E0H, 00H ;Y
DB 86H, 8AH, 92H, 0A2H, 0C2H, 00H ;Z
DB 7CH, 8AH, 92H, 0A2H, 7CH, 00H ;0
DB 00H, 42H, 0FEH, 02H, 00H, 00H ;1
DB 42H, 86H, 8AH, 92H, 62H, 00H ;2
DB 84H, 82H, 0A2H, 0D2H, 8CH, 00H ;3


DB 18H, 28H, 48H, 0FEH, 08H, 00H ;4
DB 0E4H, 0A2H, 0A2H, 0A2H, 9CH, 00H ;5
DB 3CH, 52H, 92H, 92H, 0CH, 00H ;6
DB 80H, 8EH, 90H, 0A0H, 0C0H, 00H ;7
DB 6CH, 92H, 92H, 92H, 6CH, 00H ;8
DB 60H, 92H, 92H, 94H, 78H, 00H ;9

DB 00H,00H,00H,00H,00H,00H,00H,00H

Sat Oct 05 2019, 10:35 PM
#2
Can you post a circuit diagram ?
Sun Oct 06 2019, 09:05 AM
#3
Max 7219 with led matrix 4 in 1
Mon Oct 07 2019, 04:05 AM
#4
Your implementation of a Max 7219 with led matrix 4 in 1,
may not be the same as someone else's.
We need to see your circuit diagram to be able to help.
Wed Oct 09 2019, 04:46 AM
#5
please find below attachment of circuit diagram.
[img]


[ Edited Wed Oct 09 2019, 04:50 AM ]
Wed Oct 09 2019, 04:48 AM
#6
Dear sir

all dot matrix display scroll same data.


[ Edited Wed Oct 09 2019, 04:52 AM ]
Wed Oct 09 2019, 09:31 PM
#7

max 7219 dout pin not giving serial out data.



Try this simple test program with an led on DOUNT
You should get a "clock" output.


Attachment
Thu Oct 10 2019, 03:49 AM
#8
sir, i m trying to scroll message on dot matrix display using 7219 ic, but its scroll vertically on 1 dot matrix display, i want to scroll horizontal on all dot matrix display .


Thu Oct 10 2019, 10:33 PM
#9
You seem to be 95% of the way there.
Can you post your Proteus file.

It would be very helpful to add lots of comments to your program,
to show exactly what it is supposed to do.

Adding comments saves time in the long run.
Fri Oct 11 2019, 01:36 AM
#10
please find below attachment.

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