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Input state with #BIT pre-processor

 
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Valentinus



Joined: 21 Nov 2011
Posts: 6

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Input state with #BIT pre-processor
PostPosted: Mon Jan 20, 2014 2:49 pm     Reply with quote
Hi all!

I'm using PIC18F258 and I would like to refer inputs with #bit pre-processor.
Is this would work?
Code:

// setting the pin direction to input
set_tris_a(0xFF);
//
#byte PORTA = getenv("SFR:PORTA")
//
#bit A0 = PORTA.0
//
if (A0 == 1)
{
// do something...
}

When the Input pin is changing, the PORTA register is also changing ? Or I have to use input() statement...

Thanks in advance!

Valentinus
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Mon Jan 20, 2014 3:05 pm     Reply with quote
You can test this. Make a small test program that uses both methods.
Compile it and look at the code in the .LST file. See if there are any
important differences. If not, then you have proved it will work.
Code:
#include <18F258.h>
#fuses XT, NOWDT, BROWNOUT, PUT
#use delay(clock=4M)

#byte PORTA = getenv("SFR:PORTA")
#bit A0 = PORTA.0

//========================
void main()
{
int8 i;

set_tris_a(0xFF);

if(A0 == 1)
   i = 0x55;

if(input(PIN_A0) == 1)
   i = 0x55;


while(1);
}
Valentinus



Joined: 21 Nov 2011
Posts: 6

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PostPosted: Mon Jan 20, 2014 3:48 pm     Reply with quote
Thank you very much for this practical idea. That was very helpfull.

And the answer for my question is: Yes, it will work!!! :D

Thank you again!
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