127 lines
4.4 KiB
C
127 lines
4.4 KiB
C
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#ifndef NEOGPS_CFG
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#define NEOGPS_CFG
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// Copyright (C) 2014-2017, SlashDevin
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//
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// This file is part of NeoGPS
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//
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// NeoGPS is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// NeoGPS is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with NeoGPS. If not, see <http://www.gnu.org/licenses/>.
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//------------------------------------------------------------------------
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// Enable/disable packed data structures.
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//
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// Enabling packed data structures will use two less-portable language
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// features of GCC to reduce RAM requirements. Although it was expected to slightly increase execution time and code size, the reverse is true on 8-bit AVRs: the code is smaller and faster with packing enabled.
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//
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// Disabling packed data structures will be very portable to other
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// platforms. NeoGPS configurations will use slightly more RAM, and on
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// 8-bit AVRs, the speed is slightly slower, and the code is slightly
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// larger. There may be no choice but to disable packing on processors
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// that do not support packed structures.
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//
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// There may also be compiler-specific switches that affect packing and the
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// code which accesses packed members. YMMV.
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#include <Arduino.h>
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#ifdef __AVR__
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#define NEOGPS_PACKED_DATA
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#endif
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//------------------------------------------------------------------------
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// Based on the above define, choose which set of packing macros should
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// be used in the rest of the NeoGPS package. Do not change these defines.
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#ifdef NEOGPS_PACKED_DATA
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// This is for specifying the number of bits to be used for a
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// member of a struct. Booleans are typically one bit.
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#define NEOGPS_BF(b) :b
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// This is for requesting the compiler to pack the struct or class members
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// "as closely as possible". This is a compiler-dependent interpretation.
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#define NEOGPS_PACKED __attribute__((packed))
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#else
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// Let the compiler do whatever it wants.
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#define NEOGPS_PACKED
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#define NEOGPS_BF(b)
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#endif
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//------------------------------------------------------------------------
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// Accommodate C++ compiler and IDE changes.
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//
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// Declaring constants as class data instead of instance data helps avoid
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// collisions with #define names, and allows the compiler to perform more
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// checks on their usage.
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//
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// Until C++ 10 and IDE 1.6.8, initialized class data constants
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// were declared like this:
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//
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// static const <valued types> = <constant-value>;
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//
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// Now, non-simple types (e.g., float) must be declared as
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//
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// static constexpr <nonsimple-types> = <expression-treated-as-const>;
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//
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// The good news is that this allows the compiler to optimize out an
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// expression that is "promised" to be "evaluatable" as a constant.
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// The bad news is that it introduces a new language keyword, and the old
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// code raises an error.
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//
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// TODO: Evaluate the requirement for the "static" keyword.
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// TODO: Evaluate using a C++ version preprocessor symbol for the #if.
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// #if __cplusplus >= 201103L (from XBee.h)
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//
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// The CONST_CLASS_DATA define will expand to the appropriate keywords.
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//
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#if ( \
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(ARDUINO < 10606) | \
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((10700 <= ARDUINO) & (ARDUINO <= 10799 )) | \
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((107000 <= ARDUINO) & (ARDUINO <= 107999)) \
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) \
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& \
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!defined(ESP8266) // PlatformIO Pull Request #82
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#define CONST_CLASS_DATA static const
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#else
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#define CONST_CLASS_DATA static constexpr
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#endif
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//------------------------------------------------------------------------
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// The PROGMEM definitions are not correct for Zero, MKR1000 and
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// earlier versions of Teensy boards
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#if defined(ARDUINO_SAMD_MKRZERO) | \
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defined(ARDUINO_SAMD_ZERO) | \
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defined(ARDUINO_SAM_DUE) | \
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defined(ARDUINO_ARCH_ARC32) | \
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defined(__TC27XX__) | \
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defined(NRF52) | \
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(defined(TEENSYDUINO) && (TEENSYDUINO < 139))
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#undef pgm_read_ptr
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#define pgm_read_ptr(addr) (*(const void **)(addr))
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#endif
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#endif
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