SysPwm.hpp

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/*
 * This file is part of the DUDS project. It is subject to the BSD-style
 * license terms in the LICENSE file found in the top-level directory of this
 * distribution and at https://github.com/jjackowski/duds/blob/master/LICENSE.
 * No part of DUDS, including this file, may be copied, modified, propagated,
 * or distributed except according to the terms contained in the LICENSE file.
 *
 * Copyright (C) 2017  Jeff Jackowski
 */
//#include <duds/hardware/interface/Pwm.hpp>
#include <fstream>
#include <chrono>
#include <boost/exception/info.hpp>

// !@?!#?!#?
#undef linux

namespace duds { namespace hardware { namespace interface { namespace linux {

struct PwmError : virtual std::exception, virtual boost::exception { };

typedef boost::error_info<struct Info_SysPwmChip, int>  SysPwmChip;
typedef boost::error_info<struct Info_SysPwmChannel, int>  SysPwmChannel;
typedef boost::error_info<struct Info_SysPwmPeriodNs, long>
    SysPwmPeriodNs;
typedef boost::error_info<struct Info_SysPwmDutyNs, long>
    SysPwmDutyNs;

class SysPwm /* : public Pwm */ {
    std::fstream en;
    std::fstream dc;
    std::fstream per;
    std::chrono::nanoseconds dutyNs;
    std::chrono::nanoseconds periodNs;
    bool running;
public:
    SysPwm(int chip, int channel);
    ~SysPwm();
    void enable(bool state = true);
    void disable() {
        enable(false);
    }
    bool enabled() const {
        return running;
    }
    std::chrono::nanoseconds dutyPeriod() const {
        return dutyNs;
    }
    void dutyPeriod(const std::chrono::nanoseconds &ns);
    void dutyZero() {
        dutyPeriod(std::chrono::nanoseconds(0));
    }
    void dutyFull() {
        dutyPeriod(periodNs);
    }
    double dutyCycle() const;
    void dutyCycle(double ratio);
    std::chrono::nanoseconds period() const {
        return periodNs;
    }
    void period(const std::chrono::nanoseconds &ns);
    void frequency(unsigned int hz);
    unsigned int frequency() const;
};

} } } }