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/*
* button.cc
*
* Copyright (C) 2011 Tim Marston <tim@ed.am> and Dan Marston.
*
* This file is part of propeller-clock (hereafter referred to as "this
* program"). See http://ed.am/dev/software/arduino/propeller-clock for more
* information.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <Arduino.h>
#include <button.h>
Button::Button( int pin )
:
_pin( pin ),
_state_last( false ),
_millis_state( 0 ),
_millis_done( 0 ),
_pending_event( 0 ),
_interim_event( 0 ),
_send_interim( true ),
_ignore_next_unpress( false )
{
}
void Button::set_event_times( int event_times[] )
{
_event_times = event_times;
}
void Button::set_press_mode( bool send_interim )
{
// if the button is down and we're switching from sending interim presses
// to not sending interim presses, we need to ignore the next unpress, or
// this button press may trigger events while being presses *and* events
// when it is unpressed.
if( _state_last && _send_interim && !send_interim )
_ignore_next_unpress = true;
// set mode
_send_interim = send_interim;
}
void Button::update()
{
// get time
unsigned long millis = ::millis();
// get button state
bool state = digitalRead( _pin )? false : true;
// if the button is pressed
if( state )
{
// if it has just been pressed, record the time now and reset how much
// of the press we have already generated events for
if( !_state_last ) {
_millis_state = millis;
_millis_done = 0;
}
// calculate time that has elapsed in total this press
unsigned long elapsed = millis - _millis_state;
// look through the events to see if any need to be triggered
for( int a = 0; _event_times[ a ]; a++ )
{
// if this event is in the future, stop
if( (unsigned)_event_times[ a ] > elapsed ) break;
// if this event has already been triggered, skip
if( (unsigned)_event_times[ a ] <= _millis_done ) continue;
// trigger event
if( _send_interim )
_pending_event = a + 1;
else
_interim_event = a + 1;
}
// update the amount of press we have processed
_millis_done = elapsed;
}
// if the button has just become unpressed and we're not sending interim
// events, we'll need to trigger it now
if( !state && _state_last && !_send_interim )
{
// unless we're being told not to, trigger any interim events
if( _ignore_next_unpress )
_ignore_next_unpress = false;
else
_pending_event = _interim_event;
// clear any interim event
_interim_event = 0;
}
// update our state
_state_last = state;
}
int Button::get_event()
{
int event = _pending_event;
_pending_event = 0;
return event;
}
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