Programming Forums > Application Development > Assembly

alphonso · Dec 9th, 2005, 5:48 AM

Hi. I'm a newbie here

Anyways, I need help in this code in TASM or task assembler. The purpose is to make the LEDs (light emitting diodes) blink at an increasing manner. Here's the layout of the LEDs:

1 2 4 8 16 32 64 128
0 0 0 0 0 0 0 0

Basically, I already got the code for making all these LEDs blink at the same time for about 3 seconds, then off, then on, then off.

My problem is how to make them blink in an increasing manner: from LED 1, then LED 2, then LEDS 1 and 2, then LED 4, then LEDs 4 and 1 (the manner is that the LEDs light up from 1 to 255 so that by 254, all but LED 1 will light up and by 255, all LEDs light up) here's the code for all LEDs lighting up all at once, then off, then on again, then off:

H=hexa
B=binary

(Toggle Plain Text)

clrscr= main proc near
       mov ax,0600
       mov bx,0700
       mov cx,0000
       mov dx,184fH
       int 10



mov dx,0378H
mov al,11111111B
out dx,al
inc cx
cmp cx,0ffffH
jne a1
int 21H
mov cx,0



mov dx,0378H
mov al,00000000B
out dx,al
inc cx
cmp cx,0ffffH
jnc a2
int 21H
mov ex,0


mov dx,0378H
mov al,11111111B
out dx,al
inc cx
cmp ex,0ffffH
jnc a3
int21H
mov ex,0


mov dx,0378
mov al,00000000B
out dx,al
inc cx
cmp ex,0ffffH
jnc a4
int 21H
jmp clrscr



end program
mov ah,01
int 21H
mov ah,4cH
int 21H
main endp
end main

Could you guys help me crack the code for this one please? Thanks, God bless

DaWei · Dec 9th, 2005, 7:51 AM

Nothing wrong with being a newbie, but you should read the forum's FAQ/rules and a "How to Post..." thread before posting. For one thing, it tells you to put your code in tags.

Mjordan2nd · Dec 9th, 2005, 12:24 PM

Code tags added.

lostcauz · Dec 9th, 2005, 12:56 PM

It appears you haven't given us all the code but from a quick glance I would suggest you play with the binary values you are placing in the al register.

Dec 9th, 2005, 5:48 AM	#1
alphonso Programmer Join Date: Dec 2005 Location: Philippines, where the seasons are: hot, and hotter Posts: 72 Rep Power: 3	Almost, but not quite there Hi. I'm a newbie here Anyways, I need help in this code in TASM or task assembler. The purpose is to make the LEDs (light emitting diodes) blink at an increasing manner. Here's the layout of the LEDs: 1 2 4 8 16 32 64 128 0 0 0 0 0 0 0 0 Basically, I already got the code for making all these LEDs blink at the same time for about 3 seconds, then off, then on, then off. My problem is how to make them blink in an increasing manner: from LED 1, then LED 2, then LEDS 1 and 2, then LED 4, then LEDs 4 and 1 (the manner is that the LEDs light up from 1 to 255 so that by 254, all but LED 1 will light up and by 255, all LEDs light up) here's the code for all LEDs lighting up all at once, then off, then on again, then off: H=hexa B=binary (Toggle Plain Text) clrscr= main proc near mov ax,0600 mov bx,0700 mov cx,0000 mov dx,184fH int 10 mov dx,0378H mov al,11111111B out dx,al inc cx cmp cx,0ffffH jne a1 int 21H mov cx,0 mov dx,0378H mov al,00000000B out dx,al inc cx cmp cx,0ffffH jnc a2 int 21H mov ex,0 mov dx,0378H mov al,11111111B out dx,al inc cx cmp ex,0ffffH jnc a3 int21H mov ex,0 mov dx,0378 mov al,00000000B out dx,al inc cx cmp ex,0ffffH jnc a4 int 21H jmp clrscr end program mov ah,01 int 21H mov ah,4cH int 21H main endp end main clrscr= main proc near mov ax,0600 mov bx,0700 mov cx,0000 mov dx,184fH int 10 mov dx,0378H mov al,11111111B out dx,al inc cx cmp cx,0ffffH jne a1 int 21H mov cx,0 mov dx,0378H mov al,00000000B out dx,al inc cx cmp cx,0ffffH jnc a2 int 21H mov ex,0 mov dx,0378H mov al,11111111B out dx,al inc cx cmp ex,0ffffH jnc a3 int21H mov ex,0 mov dx,0378 mov al,00000000B out dx,al inc cx cmp ex,0ffffH jnc a4 int 21H jmp clrscr end program mov ah,01 int 21H mov ah,4cH int 21H main endp end main Could you guys help me crack the code for this one please? Thanks, God bless Last edited by Mjordan2nd; Dec 9th, 2005 at 12:24 PM. Reason: Code Tags

Dec 9th, 2005, 7:51 AM	#2
DaWei Resident Grouch Join Date: Jun 2005 Posts: 6,453 Rep Power: 10	Nothing wrong with being a newbie, but you should read the forum's FAQ/rules and a "How to Post..." thread before posting. For one thing, it tells you to put your code in tags. __________________ Abstraction doesn't make it impossible to write bad code; it makes it possible to write superior code. Contributor's Corner: Grumpy on C++ Exceptions DaWei on Pointers

Dec 9th, 2005, 12:24 PM	#3
Mjordan2nd The Supreme Ruler Join Date: May 2004 Location: Houston Posts: 1,476 Rep Power: 6	Code tags added. __________________ "Every gun that is made, every warship launched, every rocket signifies, in the final sense, a theft from those who hunger and are not fed, from those who are cold and are not clothed. The world in arms is not spending money alone. It is spending the sweat of its laborers, the genius of its scientists, the hopes of its children." - Dwight D. Eisenhower

Dec 9th, 2005, 12:56 PM	#4
lostcauz Hobbyist Programmer Join Date: Nov 2004 Location: 1691 miles East of L.A. Posts: 159 Rep Power: 4	It appears you haven't given us all the code but from a quick glance I would suggest you play with the binary values you are placing in the al register. __________________ -- lostcauz Stepped in what?... Behind whose barn?... I didn't even know they had a cow!

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Programming Forums > Application Development > Assembly

Almost, but not quite there