Someone help me to simplify this

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- 17th February 2004, 09:58
thrix

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Someone help me to simplify this

hi all... i manage to program my led matrix with the following code. is there any way to make it simpler?

I VAR WORD 'DELAY FOR ALL COLUMN DISPLAY
J VAR WORD 'DELAY FOR SHIFT LEFT NO 1 DISPLAY
K VAR WORD 'DELAY FOR SHIFT LEFT NO 2 DISPLAY
L VAR WORD 'DELAY FOR SHIFT LEFT NO 3 DISPLAY
M VAR WORD 'DELAY FOR SHIFT LEFT NO 4 DISPLAY
N VAR WORD 'DELAY FOR SHIFT LEFT NO 5 DISPLAY

TRISA = 255
TRISB = 0

MAIN:
FOR I = 0 TO 25
GOTO LOOP

loop:
' DISPLAYING AT ALL COLUMN
PORTB = $7F ''''''''''''''''''
LOW PORTA.4 ' END POINT '
PAUSE 3 ' '
HIGH PORTA.4 ''''''''''''''''''

PORTB = $8
LOW PORTA.3
PAUSE 3
HIGH PORTA.3

PORTB = $8
LOW PORTA.2
PAUSE 3
HIGH PORTA.2

PORTB = $8
LOW PORTA.1
PAUSE 3
HIGH PORTA.1

PORTB = $7F 'STARTING POINT
LOW PORTA.0
PAUSE 3
HIGH PORTA.0

NEXT

'SHIFT NO 1 TO LEFT
FOR J = 0 TO 25

PORTB = $8
LOW PORTA.0
PAUSE 3
HIGH PORTA.0

PORTB = $8
LOW PORTA.1
PAUSE 3
HIGH PORTA.1

PORTB = $8
LOW PORTA.2
PAUSE 3
HIGH PORTA.2

PORTB = $7F 'END POINT
LOW PORTA.3
PAUSE 3
HIGH PORTA.3

NEXT

'SHIFT LEFT NO 2
FOR K = 0 TO 25

PORTB = $8
LOW PORTA.0
PAUSE 3
HIGH PORTA.0

PORTB = $8
LOW PORTA.1
PAUSE 3
HIGH PORTA.1

PORTB = $7F ' END POINT
LOW PORTA.2
PAUSE 3
HIGH PORTA.2

' --------------> ' COLUMN 3 IS HIGH

PORTB = $7F ' STARTING POINT
LOW PORTA.4
PAUSE 3
HIGH PORTA.4

NEXT

'SHIFT LEFT NO 3
FOR L = 0 TO 25

PORTB = $8
LOW PORTA.0
PAUSE 3
HIGH PORTA.0

PORTB = $7F 'END POINT
LOW PORTA.1
PAUSE 3
HIGH PORTA.1

PORTB = $7F ' STARTING POINT
LOW PORTA.3
PAUSE 3
HIGH PORTA.3

PORTB = $8
LOW PORTA.4
PAUSE 3
HIGH PORTA.4

NEXT

'SHIFT LEFT NO 4
FOR M = 0 TO 25

PORTB = $7F 'END POINT
LOW PORTA.0
PAUSE 3
HIGH PORTA.0

PORTB = $7F ' STARTTING POINT
LOW PORTA.2
PAUSE 3
HIGH PORTA.2

PORTB = $8
LOW PORTA.3
PAUSE 3
HIGH PORTA.3

PORTB = $8
LOW PORTA.4
PAUSE 3
HIGH PORTA.4

NEXT
'SHIFT LEFT NO 5
FOR N = 0 TO 25

PORTB = $7F 'STARTING POINT
LOW PORTA.1
PAUSE 3
HIGH PORTA.1

PORTB = $8
LOW PORTA.2
PAUSE 3
HIGH PORTA.2

PORTB = $8
LOW PORTA.3
PAUSE 3
HIGH PORTA.3

PORTB = $8
LOW PORTA.4
PAUSE 3
HIGH PORTA.4

NEXT

goto MAIN

' Go back to loop and blink LED forever
End
- 19th February 2004, 21:06
Dwayne

Hello Thrix

Thrix, a couple of things ok?
1. I do not have anyway how to test this ok?

Now. 2nd thing.... I noticed that you used the variables I-N for some For-Next Loops. Well I also noticed that none of these loops were nested. That means you can use 1 variable for *all* the loops (for this program example only that you gave).

Now the 3rd thing.... I Noticed that you were only Toggling 5 ports on and off... Nothing more. So what I did, was put every one of your toggles into a SubRoutine. When I want to Toggle that port, I just call that subroutine. This probably cut the number of lines in your code by 1/3.

Since I have no way of checking the program against something, I may have errored in reading your code. I also noticed a Loop: and a Goto Loop: Those seemed redundant, because at the end of your program you have Goto Main. It is also not wise to jump in the middle of a For/Next loop with a goto *outside* the for/next loop.

Here is what i think the code may look like after the above points are implimented:

I VAR WORD 'DELAY FOR ALL COLUMN DISPLAY

TRISA = 255
TRISB = 0

MAIN:
FOR I = 0 TO 25

' DISPLAYING AT ALL COLUMN
PORTB = $7F ''''''''''''''''''
GoSub TogPA4

PORTB = $8
GoSub TogPA3

PORTB = $8
GoSub TogPA2

PORTB = $8
GoSub TogPA1

PORTB = $7F 'STARTING POINT

GoSub TogPA0

NEXT I

'SHIFT NO 1 TO LEFT
FOR I = 0 TO 25

PORTB = $8
GoSub TogPA0

PORTB = $8
GoSub TogPA1

PORTB = $8
GoSub TogPA2

PORTB = $7F 'END POINT
Gosub TogPA3

NEXT I

'SHIFT LEFT NO 2
FOR I = 0 TO 25

PORTB = $8
gosub TogPA0

PORTB = $8
GoSub TogPA1

PORTB = $7F ' END POINT
Gosub TogPA2
' --------------> ' COLUMN 3 IS HIGH

PORTB = $7F ' STARTING POINT
GoSub TogPA4

NEXT I

'SHIFT LEFT NO 3
FOR I = 0 TO 25

PORTB = $8
GoSub TogPA0

PORTB = $7F 'END POINT
GoSub TogPA1

PORTB = $7F ' STARTING POINT
GoSub TogPA3

PORTB = $8
GoSub TogPA4
NEXT I

'SHIFT LEFT NO 4
FOR I = 0 TO 25

PORTB = $7F 'END POINT
GoSub TogPA0

PORTB = $7F ' STARTTING POINT
GoSub TogPA2

PORTB = $8
GoSub TogPA3

PORTB = $8
GoSub TogPA4
NEXT I

'SHIFT LEFT NO 5
FOR I = 0 TO 25

PORTB = $7F 'STARTING POINT
GoSub TogPA1

PORTB = $8
GoSub TogPA2

PORTB = $8
GoSub TogPA3

PORTB = $8
GoSub TogPA4
NEXT I

goto MAIN

;subroutines!!!!!!!!!!

TogPA4:
LOW PORTA.4 ' END POINT '
PAUSE 3 ' '
HIGH PORTA.4 ''''''''''''''''''
return

TogPA3:
LOW PORTA.3
PAUSE 3
HIGH PORTA.3
return

TogPA2:
LOW PORTA.2
PAUSE 3
HIGH PORTA.2
return

TogPA1:
LOW PORTA.1
PAUSE 3
HIGH PORTA.1
return

TogPA0:
LOW PORTA.0
PAUSE 3
HIGH PORTA.0
return

' Go back to loop and blink LED forever
End
- 19th February 2004, 22:17
Dwayne

Hello Thrix,

A couple of more things.
1. I was able to do a For/Next loop, and shift 5 times, but I could not include the very first shift, because I did not know if you had to "Toggle" the port in that sequence.

the First time you toggled, (the I loop) you toggled P.4, P.3, P.2, P.1,P.0, in that order. The rest of the times you toggled them exactly backwards. P.0,P.1,P.2,P.3,P.4.
I looped the ones you toggled backwards together, and put if statments in them. I couldn't loop the very first one, because I do not know if you can toggle them the other way.

2. I wrote the *if* statements in a different langauge. I do not know the exact structure of the if statement for what you are using. This means you will have to convert my if statement to yours. For example;

if(counter==1)
{
..........
} else
{
.......
}

Might be converted to your if statement as:

if (counter=1)
Begin
.......
else
.......
endif

3. If it doesn't matter on the very first loop whether you toggle the ports 0-4 or 4 - 0 , You can include that into my loop by adding just one if statement and making the counter go from 0 to 5, instead of 1 to 5, and get rid of another loop and simplify it even more.

Here is a shorter , more simplified program....

I VAR WORD 'DELAY FOR ALL COLUMN DISPLAY
counter var word'

TRISA = 255
TRISB = 0

MAIN:
FOR I = 0 TO 25

' DISPLAYING AT ALL COLUMN
PORTB = $7F ''''''''''''''''''
GoSub TogPA4

PORTB = $8
GoSub TogPA3

PORTB = $8
GoSub TogPA2

PORTB = $8
GoSub TogPA1

PORTB = $7F 'STARTING POINT

GoSub TogPA0

NEXT I

'Lets shift!
For counter=1 to 5
For J = 0 TO 25

if(counter==4)
{
PORTB = $7
GoSub TogPA0
}else if(counter!=5)
{
PORTB = $8
GoSub TogPA0
}

if((counter==3) or (counter==5))
{
PORTB = $7
GoSub TogPA1
}else if(counter!=4)
{
PORTB = $8
GoSub TogPA1
}

if((counter==2) or (counter==4))
{
PORTB = $7
GoSub TogPA2
}else if(counter!=3)
{
PORTB = $8
GoSub TogPA2
}

if((counter==1) or (counter==3))
{
PORTB = $7
GoSub TogPA3
}else if(counter!=2)
{
PORTB = $8
GoSub TogPA3
}

if(counter==2)
{
PORTB = $7
GoSub TogPA4
}else if(counter!=1)
{
PORTB = $8
GoSub TogPA4
}

NEXT j
Next counter

goto MAIN

;subroutines!!!!!!!!!!

TogPA4:
LOW PORTA.4 ' END POINT '
PAUSE 3 ' '
HIGH PORTA.4 ''''''''''''''''''
return

TogPA3:
LOW PORTA.3
PAUSE 3
HIGH PORTA.3
return

TogPA2:
LOW PORTA.2
PAUSE 3
HIGH PORTA.2
return

TogPA1:
LOW PORTA.1
PAUSE 3
HIGH PORTA.1
return

TogPA0:
LOW PORTA.0
PAUSE 3
HIGH PORTA.0
return

' Go back to loop and blink LED forever
End
- 20th February 2004, 08:33
thrix

thanks

thanks a lot friend... i'm new to this pic thing but getting okay step by step .. btw thanks again
- 21st February 2004, 05:01
Dwayne

Hello Thrix,

Thrix >>thanks a lot friend... i'm new to this pic thing but getting okay step by step .. btw thanks again<<

You are very welcome. I am also very new to these PIC chips. I used to program the Phillips chips with assembly, and decided to try these little PIC chips for a project of mine.

I chief programmer for a major company, so the programming part I have no problems with. Its just trying to learn the different syntax of this chip and/or the basic pro.

Dwayne