mirror of
https://github.com/DCC-EX/CommandStation-EX.git
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ddc55690f3
Add function to maintain a minimum value seen of free memory. Add call to it in DCCWaveform interrupt handler (assumed to be the likely worst case for stack usage). Report this minimum value in main loop.
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 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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