mirror of
https://github.com/DCC-EX/CommandStation-EX.git
synced 2024-12-23 21:01:25 +01:00
56 lines
1.6 KiB
C++
56 lines
1.6 KiB
C++
/*
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* © 2020, Harald Barth
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* © 2021, Neil McKechnie
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*
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* This file is part of Asbelos DCC-EX
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*
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* This 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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* It 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 CommandStation. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include "freeMemory.h"
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// thanks go to https://github.com/mpflaga/Arduino-MemoryFree
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#if defined(__arm__)
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extern "C" char* sbrk(int);
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#elif defined(__AVR__)
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extern char *__brkval;
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extern char *__malloc_heap_start;
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#else
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#error Unsupported board type
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#endif
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static volatile int minimum_free_memory = 32767;
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int freeMemory() {
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char top;
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#if defined(__arm__)
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return &top - reinterpret_cast<char*>(sbrk(0));
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#elif defined(__AVR__)
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return __brkval ? &top - __brkval : &top - __malloc_heap_start;
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#else
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#error bailed out alredy above
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#endif
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}
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// Update low ram level. Allow for extra bytes to be specified
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// by estimation or inspection, that may be used by other
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// called subroutines.
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int updateMinimumFreeMemory(unsigned char extraBytes) {
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int spare = freeMemory()-extraBytes;
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if (spare < minimum_free_memory) minimum_free_memory = spare;
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return minimum_free_memory;
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}
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