mayhem-firmware/firmware/common/buffer_exchange.hpp

/*
 * Copyright (C) 2016 Jared Boone, ShareBrained Technology, Inc.
 *
 * This file is part of PortaPack.
 *
 * 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 2, 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; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street,
 * Boston, MA 02110-1301, USA.
 */

#pragma once

#include "ch.h"

#include "message.hpp"
#include "fifo.hpp"
#include "io.hpp"

class BufferExchange {
   public:
    BufferExchange(CaptureConfig* const config);
    BufferExchange(ReplayConfig* const config);
    ~BufferExchange();

    BufferExchange(const BufferExchange&) = delete;
    BufferExchange(BufferExchange&&) = delete;
    BufferExchange& operator=(const BufferExchange&) = delete;
    BufferExchange& operator=(BufferExchange&&) = delete;

#if defined(LPC43XX_M0)
    bool empty() const {
        return fifo_buffers_for_application->is_empty();
    }

    StreamBuffer* get() {
        return get(fifo_buffers_for_application);
    }

    StreamBuffer* get_prefill() {
        return get_prefill(fifo_buffers_for_application);
    }

    bool put(StreamBuffer* const p) {
        return fifo_buffers_for_baseband->in(p);
    }

    bool put_app(StreamBuffer* const p) {
        return fifo_buffers_for_application->in(p);
    }
#endif

#if defined(LPC43XX_M4)
    bool empty() const {
        return fifo_buffers_for_baseband->is_empty();
    }

    StreamBuffer* get() {
        return get(fifo_buffers_for_baseband);
    }

    bool put(StreamBuffer* const p) {
        return fifo_buffers_for_application->in(p);
    }
#endif

    static void handle_isr() {
        if (obj) {
            obj->check_fifo_isr();
        }
    }

   private:
    // CaptureConfig* const config_capture;
    // ReplayConfig* const config_replay;
    FIFO<StreamBuffer*>* fifo_buffers_for_baseband{nullptr};
    FIFO<StreamBuffer*>* fifo_buffers_for_application{nullptr};
    Thread* thread{nullptr};
    static BufferExchange* obj;

    enum {
        CAPTURE,
        REPLAY
    } direction{};

    void check_fifo_isr() {
        if (!empty())
            wakeup_isr();
    }

    void wakeup_isr() {
        auto thread_tmp = thread;
        if (thread_tmp) {
            thread = nullptr;
            chSchReadyI(thread_tmp);
        }
    }

    StreamBuffer* get(FIFO<StreamBuffer*>* fifo);

    StreamBuffer* get_prefill(FIFO<StreamBuffer*>* fifo);
};