PIC16F19176 use same function to check 2 input pins

[flyway38]

Hello,

Need help to use same function wich cheks for an input pin as a buttn.

But now need to implement new input pin as another button.

How to pass to that function which pin to read?

Can I use "byte in device" in its input parameters?

Thank you very much.

Kind regards,

Filipe Santos

[Rob CJ]

Hi Filipe,

I never tried this but here is a thought.

The pin on a specific port can be found in the LATx register, example below for portc this is LATC.

You find this in your device file for e.g. pin_C2

var volatile bit    LATC_LATC2                at LATC : 2

var volatile bit    pin_C2                    at PORTC : 2

So if you have for example your buttons on port C you could pass a 'mask' as parameter to the procedure. Example below (not compiled):

function pin_active(byte in pin_mask) return bit

   return (LATC & pin_mask)

end function

So if you want to if test pin C1 is active (HIGH) or pin C7 is active (HIGH) you do:

    if  pin_active(0b0000_0010) then

       -- Do something for bin C1

   end if 

   if pin_active(0b1000_0000) then

      --  Do something for pin C7

    end if 

Kind regards,

Rob

---

Van: jal...@googlegroups.com <jal...@googlegroups.com> namens flyway38 <fsfo...@gmail.com>
Verzonden: donderdag 12 januari 2023 12:07
Aan: jallib <jal...@googlegroups.com>
Onderwerp: [jallib] PIC16F19176 use same function to check 2 input pins

 

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[flyway38]

Hi Rob,

WOW, nice trick.

Will check if works.

Thank you very much.

Cheers,

FS

[Rob CJ]

Hi Filipe,

One correction. The return statement should be something like.

       return (LATC & pin_mask) != 0

Let me know if it works, I never tried it myself.

Kind regards,

Rob

---

Van: jal...@googlegroups.com <jal...@googlegroups.com> namens flyway38 <fsfo...@gmail.com>

Verzonden: donderdag 12 januari 2023 19:11
Aan: jallib <jal...@googlegroups.com>
Onderwerp: Re: [jallib] PIC16F19176 use same function to check 2 input pins

 

To view this discussion on the web visit https://groups.google.com/d/msgid/jallib/404b1de4-c3cd-47b4-a12e-1f7dce577e91n%40googlegroups.com.

[Oliver Seitz]

Sorry, Rob, little mistake:

You need to check the PORTC register. The LATC register contains the output pattern, not the input state of the port pins.

Otherwise a good idea :-)

Greets,

Kiste

Am Donnerstag, 12. Januar 2023 um 19:11:43 MEZ hat flyway38 <fsfo...@gmail.com> Folgendes geschrieben:

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[Rob CJ]

Hi Oliver,

Thanks for the feedback. I was not sure indeed.

Kind regards,

Rob

---

Van: 'Oliver Seitz' via jallib <jal...@googlegroups.com>
Verzonden: donderdag 12 januari 2023 19:29
Aan: jal...@googlegroups.com <jal...@googlegroups.com>
Onderwerp: Re: [jallib] PIC16F19176 use same function to check 2 input pins

 

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