Util Library - mikroElektronika PIC Microcontrollers PIC12 User Manual

mikroC - C Compiler for Microchip PIC microcontrollers

Util Library

Util library contains miscellaneous routines useful for project development.
Button
Prototype
char Button(char *port, char pin, char time, char active_state);
Returns Returns 0 or 255.
Description Function eliminates the influence of contact flickering upon pressing a button (debounc-
ing).
Parameters
minimum time pin has to be in active state in order to return TRUE; parameter
active_state
zero or logical one.
Example Example reads RB0, to which the button is connected; on transition from 1 to 0 (release
of button), PORTD is inverted:
do {
if (Button(&PORTB, 0, 1, 1)) oldstate = 1;
if (oldstate && Button(&PORTB, 0, 1, 0)) {
}
} while(1);
page
280
and specify location of the button; parameter
port pin
can be either 0 or 1, and it determines if button is active upon logical
PORTD = ~PORTD;
oldstate = 0;
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specifies the
time