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57 lines
1.6 KiB
C
57 lines
1.6 KiB
C
/* Arduino SdFat Library
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* Copyright (C) 2015 by William Greiman
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*
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* This file is part of the Arduino SdFat Library
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*
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* This Library 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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* This Library 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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* You should have received a copy of the GNU General Public License
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* along with the Arduino SdFat Library. If not, see
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* <http://www.gnu.org/licenses/>.
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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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