//! # Low level SD card access module
//!
//! Contains constants from the SD Specifications.
//!
//! Based on SdFat, under the following terms:
//!
//! > Copyright (c) 2011-2018 Bill Greiman
//! > This file is part of the SdFat library for SD memory cards.
//! >
//! > MIT License
//! >
//! > Permission is hereby granted, free of charge, to any person obtaining a
//! > copy of this software and associated documentation files (the "Software"),
//! > to deal in the Software without restriction, including without limitation
//! > the rights to use, copy, modify, merge, publish, distribute, sublicense,
//! > and/or sell copies of the Software, and to permit persons to whom the
//! > Software is furnished to do so, subject to the following conditions:
//! >
//! > The above copyright notice and this permission notice shall be included
//! > in all copies or substantial portions of the Software.
//! >
//! > THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
//! > OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//! > FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//! > AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//! > LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
//! > FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
//! > DEALINGS IN THE SOFTWARE.
//==============================================================================