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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( false ),
_state_millis( 0 ),
_state_duration_done( 0 ),
_pending_event( 0 ),
_send_interim( false ),
_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 && _send_interim && !send_interim )
_ignore_next_unpress = true;
// set mode
_send_interim = send_interim;
}
void Button::update()
{
// get time
unsigned long millis = ::millis();
// get state and check for change
bool state = digitalRead( _pin )? false : true;
if( state != _state )
{
// if we're not sending interim presses, we care about when the button
// is being unpressed
if( !_send_interim && !state )
{
// are we being told to ignore the next unpress?
if( _ignore_next_unpress )
_ignore_next_unpress = false;
else
{
// check through events to see if the button was pressed long
// enough to trigger one
for( int a = 0; _event_times[ a ]; a++ )
{
// if this event is in the future, we can stop looking
if( _state_millis < (unsigned long)_event_times[ a ] )
break;
// trigger it
_pending_event = a + 1;
}
}
}
// reset state
_state = state;
_state_millis = millis;
_state_duration_done = 0;
}
// if we are sending interim presses, we care about all the time that the
// button is being pressed
if( _send_interim && state )
{
// calculate new duration for this state
unsigned long duration = millis - _state_millis;
// check through events to see if the button has been pressed long
// enough to trigger one
for( int a = 0; _event_times[ a ]; a++ )
{
// if this event is in the future, we can stop looking
if( duration < (unsigned long)_event_times[ a ] )
break;
// if this event happened since the previous update, trigger it
if( _state_duration_done < (unsigned long)_event_times[ a ] )
_pending_event = a + 1;
}
// update the duration we've accounted for
_state_duration_done = duration;
}
}
int Button::get_event()
{
int event = _pending_event;
_pending_event = 0;
return event;
}
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