Is this possible?

[ERMEGM]

Hello Everyone,

Having a little trouble with some coding. I have a manufacturer's product that I decided to reprogram. It is a 16F687 chip that connects its outputs to some MOSfets. They are all arranged in a row from 1-10, but the pins used are not. I wanted to be able to use coding like this:

ZigZag          DATA    Word %0000000001, 2
                DATA    Word %0000000010, 2
                DATA    Word %0000000100, 2
                DATA    Word %0000001000, 2
                DATA    Word %0000010000, 2
                DATA    Word %0000100000, 2
                DATA    Word %0001000000, 2
                DATA    Word %0010000000, 2
                DATA    Word %0100000000, 2
                DATA    Word %1000000000, 2
                DATA    Word %0100000000, 2
                DATA    Word %0010000000, 2
                DATA    Word %0001000000, 2
                DATA    Word %0000100000, 2
                DATA    Word %0000010000, 2
                DATA    Word %0000001000, 2
                DATA    Word %0000000100, 2
                DATA    Word %0000000010, 2
                DATA    Word %0000000001, 2
                DATA    Word %0000000000, 0

This style makes it easy to see which MOSfets are turning on and in essence is easy on the eyes, but the pins are arranged like this:

RC5, RC0, RC4, RC1, RC3, RC2, RC6, RB4, RC7, RB6

As you can see, they are not in order, so if I used the above format, the outputs won't zigzag like the layout, but rather be randomly jumping around.

So my question is this, is there a way to reassign the bits after reading the zigzag code above? In plain english, I want it to say:

read pin 0 (from zigzag) and display it on RC5
read pin 1 (from zigzag) and display it on RC0
etc....

Is there a way to do this? The obvious thing would be to set up the traces in the correct order, but this is the manufacturer's board and I'm reprogramming it to do something else. I was told to use something like translating the bits, but the sample code did not work and I can't find anything else anywhere.

The rest of my code reads each line from above and displays them one line at a time. But with this board, you can imagine how it's going to jump around.

Thanks for your help in advance,
Tony

[mackrackit]

If all you are wanting to do is make the code readable

ZIG1 VAR PORTC.5
ZIG2 VAR PORTC.0
ZIG3 VAR PORTC.4

You get the picture.

[Darrel Taylor]

Of course it's possible.
You're using PicBasic Pro.

Pattern   VAR WORD
Idx       VAR BYTE
;---------------------------------------------------------------------------
INCLUDE "VirtualPort.bas";
ASM  
MyPortPins  macro               ; these define which bits go with which pins
Vpin   0, PORTC,5
Vpin   1, PORTC,0
Vpin   2, PORTC,4
Vpin   3, PORTC,1
Vpin   4, PORTC,3
Vpin   5, PORTC,2
Vpin   6, PORTC,6
Vpin   7, PORTB,4
Vpin   8, PORTC,7
Vpin   9, PORTB,6
endm
ENDASM
;---------------------------------------------------------------------------
Init:
@   OutputPort  MyPortPins             ; Set Pins to Output
 
Main:
    FOR Idx = 0 to 38 STEP 2
READ Idx, WORD Pattern             ; get pattern from EEPROM
@       WritePort  _Pattern, MyPortPins    ; write pattern to Virtual Port
PAUSE 100
NEXT Idx
GOTO Main

[ERMEGM]

Thanks Darrel.

[ERMEGM]

OK, having a little difficulty, and can't seem to sort it out. I'm getting a bad expression and an output parameter must be a variable Error on this line:

READ Idx, WORD Pattern ; get pattern from EEPROM

Can't figure it out. What am I doing wrong? This is going on a 16f687 chip.

[Darrel Taylor]

You have PBP 2.60? Right?
<br>

[ERMEGM]

Aha. 2.50b. Is 2.60 available online to download?