digital_input.cpp

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/*
 * Copyright (c) 2019, Open Source Robotics Foundation
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the copyright holder nor the names of its
 *       contributors may be used to endorse or promote products derived from
 *       this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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 * POSSIBILITY OF SUCH DAMAGE.
 */
 
#include <functional>
#include <string>
 
#include <libphidget22/phidget22.h>
 
#include "phidgets_api/digital_input.h"
#include "phidgets_api/phidget22.h"
 
namespace phidgets {
 
DigitalInput::DigitalInput(int32_t serial_number, int hub_port,
                           bool is_hub_port_device, int channel,
                           std::function<void(int, int)> input_handler)
    : channel_(channel), input_handler_(input_handler)
{
    PhidgetReturnCode ret = PhidgetDigitalInput_create(&di_handle_);
    if (ret != EPHIDGET_OK)
    {
        throw Phidget22Error(
            "Failed to create DigitalInput handle for channel " +
                std::to_string(channel),
            ret);
    }
 
    helpers::openWaitForAttachment(reinterpret_cast<PhidgetHandle>(di_handle_),
                                   serial_number, hub_port, is_hub_port_device,
                                   channel);
 
    ret = PhidgetDigitalInput_setOnStateChangeHandler(di_handle_,
                                                      StateChangeHandler, this);
    if (ret != EPHIDGET_OK)
    {
        throw Phidget22Error(
            "Failed to set change handler for DigitalInput channel " +
                std::to_string(channel),
            ret);
    }
}
 
DigitalInput::~DigitalInput()
{
    PhidgetHandle handle = reinterpret_cast<PhidgetHandle>(di_handle_);
    helpers::closeAndDelete(&handle);
}
 
bool DigitalInput::getInputValue() const
{
    int state;
    PhidgetReturnCode ret = PhidgetDigitalInput_getState(di_handle_, &state);
    if (ret != EPHIDGET_OK)
    {
        throw Phidget22Error("Failed to get digital input state", ret);
    }
 
    return !!state;
}
 
void DigitalInput::stateChangeHandler(int state) const
{
    input_handler_(channel_, state);
}
 
void DigitalInput::StateChangeHandler(
    PhidgetDigitalInputHandle /* input_handle */, void *ctx, int state)
{
    ((DigitalInput *)ctx)->stateChangeHandler(state);
}
 
}  // namespace phidgets