InterfaceDigitalOut.h

/*
 * Mbed-OS Microcontroller Library
 * Copyright (c) 2021 Embedded Planet
 * Copyright (c) 2021 ARM Limited
 * SPDX-License-Identifier: Apache-2.0
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License
 */
 
#ifndef MBED_INTERFACE_DIGITALOUT_H_
#define MBED_INTERFACE_DIGITALOUT_H_
 
#include "PinNames.h"
 
namespace mbed {
 
class DigitalOut;
 
namespace interface {
 
#ifdef FEATURE_EXPERIMENTAL_API
 
// TODO - move method doxygen comments to interface once this polymorphism is mainstream
 
// Pure interface definition for DigitalOut
struct DigitalOut {
    virtual ~DigitalOut() = default;
    virtual void write(int value) = 0;
    virtual int read() = 0;
    virtual int is_connected() = 0;
 
    DigitalOut &operator= (int value)
    {
        // Underlying implementation is responsible for thread-safety
        write(value);
        return *this;
    }
 
    DigitalOut &operator= (DigitalOut &rhs)
    {
        // Underlying implementation is responsible for thread-safety
        write(rhs.read());
        return *this;
    }
 
    operator int()
    {
        // Underlying implementation is responsible for thread-safety
        return read();
    }
 
};
#else
using DigitalOut = ::mbed::DigitalOut;
#endif /* FEATURE_EXPERIMENTAL_API */
 
} // namespace interface
} // namespace mbed
 
 
#endif /* MBED_INTERFACE_DIGITALOUT_H_ */