DigitalPinMasterSyncSerial.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/DigitalPinSet.hpp>
#include <duds/hardware/interface/MasterSyncSerial.hpp>
#include <duds/hardware/interface/ChipSelect.hpp>

namespace duds { namespace hardware { namespace interface {

class DigitalPinMasterSyncSerial : public MasterSyncSerial {
    ChipSelect sel;
    ChipAccess chipAcc;
    
    DigitalPinSet pins;
    // must be very careful to retire on all failures
    DigitalPinSetAccess acc;
    enum PinPos {
        ClockPin,
        DataPin,
        InputPin,
        OutputPin = DataPin
    };
    std::shared_ptr<PinStore> store;
    union {
        unsigned int pins[3];
        struct {
            unsigned int clk;
            unsigned int dat;
            unsigned int datI;
        };
    };
    DigitalPinAccess acc[3];
    static void checkPins(const DigitalPinSet &ps, Flags cfg);
protected:
    virtual void open();
    virtual void close();
    virtual void start();
    virtual void stop();
    virtual void transfer(
        const std::uint8_t * __restrict__ out,
        std::uint8_t * __restrict__ in,
        int bits
    );
public:
    DigitalPinMasterSyncSerial();
    DigitalPinMasterSyncSerial(Flags flags, int period);
    DigitalPinMasterSyncSerial(const DigitalPinSet &pset, Flags flags, int period);
    DigitalPinMasterSyncSerial(DigitalPinSet &&pset, Flags flags, int period);
    ~DigitalPinMasterSyncSerial();
    void setPins(const PinIndex &pi);
    void setPins(const std::shared_ptr<PinIndex> &pi) {
        setPins(*pi);
    }
    void setPins(
        const std::shared_ptr<PinStore> &store,
        unsigned int clock,
        unsigned int data
    );
    void setPins(
        const std::shared_ptr<PinStore> &store,
        unsigned int clock,
        unsigned int output,
        unsigned int input
    );
    void setChipSelect(const ChipSelect &cs);
    void clockFrequency(unsigned int freq);
    void clockPeriod(unsigned int nanos);
};

} } } // namespaces