Reassigning I/O within the program ?

[Del Tapparo]

Yes, there are many ways to achieve this within the loop of the main program. I was trying avoid having to make pin decisions every time I wanted to collect data. I just want to reassign the pins at the beginning of the program, and never worry about it again (i.e. less code).

Having thought about this for awhile now, I think the easiest way is to just make a subroutine for each data input (e.g. Get_Data) that makes the I/O pin decision each time I need the data. It still gobbles up a bunch of code, but is still relatively easy to follow the logic.

[Darrel Taylor]

Yes, there are many ways to achieve this within the loop of the main program. I was trying avoid having to make pin decisions every time I wanted to collect data. I just want to reassign the pins at the beginning of the program, and never worry about it again (i.e. less code).

I don't see a difference there.

If you set the PIN variable at the top of the program instead of in the main loop, it's the same thing.

Best regards,

[Del Tapparo]

I get it now ....

In my case, all of the reassigned inputs use the PULSIN command. I simply assign a variable to the pin portion of the PULSIN command, separate from the resulting input data variable.

Thanks Darrel! Much appreciated.

[tenaja]

I don't like needing to check the compiler files for information, because changing PICs can be a hassle, especially when you forget about it.

When I did it (years ago) I had to do something like this...
myPIN = 2 ...set this in your IF statements
low portb.0[myPIN] ...allows you to use any port you like, and changing PICs is easy.

[Darrel Taylor]

>myPIN = 2 ...set this in your IF statements
>low portb.0[myPIN]

That would READ PORTB.2, and set either PORTB.0 or PORTB.1 low depending on the state of RB2(0 or 1).

portb.0[myPIN] = 1 ; lets you control any pin, assuming TRIS has been set

But it can't be used in SERIN/OUT, PULSIN/OUT, RCTIME, HIGH/LOW, etc., like the PIN numbers can.

[tenaja]

>myPIN = 2 ...set this in your IF statements
>low portb.0[myPIN]

That would READ PORTB.2, ....

How in the world wout that READ a pin?

[Darrel Taylor]

How in the world wout that READ a pin?

With most PBP statements, you only have 3 options for the PIN's.
It's usually described like this in the manual ...

Pin may be a constant, 0-15, or a variable that contains a number 0-15 (e.g. B0) or a pin name (e.g. PORTA.0).

But portb.0[myPIN] is an Array operation.
The only one of the 3 options that fits an array result is "or a variable that contains a number 0-15".

In order to know which PIN to use, it has to READ the variable, or in this case do the array operation (reading a PIN).
Since it's a BIT array, it will only see a 1 or a 0.

hth,