62 lines
2.0 KiB
C
62 lines
2.0 KiB
C
/**
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* Copyright (c) 2011-2018 Bill Greiman
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* This file is part of the SdFat library for SD memory cards.
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*
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* MIT License
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#ifndef FreeStack_h
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#define FreeStack_h
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/**
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* \file
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* \brief FreeStack() function.
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*/
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#if defined(__AVR__) || defined(DOXYGEN)
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/** boundary between stack and heap. */
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extern char *__brkval;
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/** End of bss section.*/
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extern char __bss_end;
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/** Amount of free stack space.
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* \return The number of free bytes.
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*/
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static int FreeStack() {
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char* sp = reinterpret_cast<char*>(SP);
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return __brkval ? sp - __brkval : sp - &__bss_end;
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// char top;
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// return __brkval ? &top - __brkval : &top - &__bss_end;
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}
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#elif defined(PLATFORM_ID) // Particle board
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static int FreeStack() {
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return System.freeMemory();
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}
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#elif defined(__arm__)
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extern "C" char* sbrk(int incr);
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static int FreeStack() {
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char top = 't';
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return &top - reinterpret_cast<char*>(sbrk(0));
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}
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#else
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#warning FreeStack is not defined for this system.
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static int FreeStack() {
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return 0;
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}
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#endif
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#endif // FreeStack_h
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