ABL electronic PIC12 Benutzerhandbuch

Util library contains miscellaneous routines useful for project development.

mikroC - C Compiler for Microchip PIC microcontrollers

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Button(char *port, char pin, char time, char active_state);

Returns 0 or 255.

Function eliminates the influence of contact flickering upon pressing a button (debounc-
ing). 

Parameters 

port

and 

pin

specify location of the button; parameter 

time

specifies the

minimum time pin has to be in active state in order to return TRUE; parameter

active_state

can be either 0 or 1, and it determines if button is active upon logical

zero or logical one.

Example reads RB0, to which the button is connected; on transition from 1 to 0 (release
of button), PORTD is inverted:

{

(Button(&PORTB, 0, 1, 1)) oldstate = 1;

(oldstate && Button(&PORTB, 0, 1, 0)) {

PORTD = ~PORTD;

oldstate = 0;

}

} while(1);