portapack-mayhem/firmware/application/sd_card.cpp

/*
 * Copyright (C) 2015 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.
 */

#include "sd_card.hpp"

#include <hal.h>

#include "ff.h"

namespace sd_card {

FATFS fs;

namespace {

bool card_present = false;

Status status_{Status::NotPresent};

FRESULT mount() {
    return f_mount(&fs, reinterpret_cast<const TCHAR*>(_T("")), 0);
}

} /* namespace */

Signal<Status> status_signal;

void poll_inserted() {
    const auto card_present_now = sdcIsCardInserted(&SDCD1);
    if (card_present_now != card_present) {
        card_present = card_present_now;

        Status new_status{card_present ? Status::Present : Status::NotPresent};

        if (card_present) {
            if (sdcConnect(&SDCD1) == CH_SUCCESS) {
                if (mount() == FR_OK) {
                    new_status = Status::Mounted;
                } else {
                    new_status = Status::MountError;
                }
            } else {
                new_status = Status::ConnectError;
            }
        } else {
            sdcDisconnect(&SDCD1);
        }

        status_ = new_status;
        status_signal.emit(status_);
    }
}

Status status() {
    return status_;
}

} /* namespace sd_card */