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How to define a function to port

 
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pilar



Joined: 30 Jan 2008
Posts: 187

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How to define a function to port
PostPosted: Wed Oct 07, 2020 9:46 am     Reply with quote

Hi, how can I define a function that monitors the logical state of an input already defined?

here I define the port:
Code:
#define btonPANIC   input(PIN_B0)
#define pulsosRTC   PIN_B1
#define btonTEST   input(PIN_B2)


here I want to define the function but how do I relate it to the port?
Code:
void debounce(btonPANIC ????????, char flag){

}
Ttelmah



Joined: 11 Mar 2010
Posts: 17202

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PostPosted: Wed Oct 07, 2020 9:58 am     Reply with quote

How old is your compiler?.
On old compilers, pin numbers have to be a constant, so can't be passed
like this (well can be using some old code that was posted here, but
not using the standard functions). On newer compilers the value can
be a variable:

Code:

void debounce(int16 pin_to_use, char flag){
   x=input(pin_to_use);
   //will then access the specified pin.
}   


However _beware_ it takes dozens of instructions to access a pin declared
as a variable, against just a couple for direct access. So if you want real
speed 'think again'....
temtronic



Joined: 01 Jul 2010
Posts: 8091
Location: Greensville,Ontario

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PostPosted: Wed Oct 07, 2020 2:03 pm     Reply with quote

Someone converted the 'button.c' function from PBasic(?) years ago. I think it's in the 'code' forum, well, pretty sure...
Old brain matter isn't um, ah, what it, er, used to be....

Jay
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