ardupilot/libraries/AP_BattMonitor/AP_BattMonitor_Backend.cpp

// -*- tab-width: 4; Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*-
/*
   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU 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 General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <AP_Common/AP_Common.h>
#include <AP_HAL/AP_HAL.h>
#include "AP_BattMonitor.h"
#include "AP_BattMonitor_Backend.h"

/*
  base class constructor.
  This incorporates initialisation as well.
*/
AP_BattMonitor_Backend::AP_BattMonitor_Backend(AP_BattMonitor &mon, uint8_t instance, AP_BattMonitor::BattMonitor_State &mon_state) :
        _mon(mon),
        _state(mon_state),
        _instance(instance)
{
}

/// capacity_remaining_pct - returns the % battery capacity remaining (0 ~ 100)
uint8_t AP_BattMonitor_Backend::capacity_remaining_pct() const
{
    float mah_remaining = _mon._pack_capacity[_state.instance] - _state.current_total_mah;
    if ( _mon._pack_capacity[_state.instance] > 10 ) { // a very very small battery
        return (100 * (mah_remaining) / _mon._pack_capacity[_state.instance]);
    } else {
        return 0;
    }
}

/// set capacity for this instance
void AP_BattMonitor_Backend::set_capacity(uint32_t capacity)
{
    _mon._pack_capacity[_instance] = capacity;
}