mirror of
https://github.com/DCC-EX/CommandStation-EX.git
synced 2024-11-27 01:56:14 +01:00
56 lines
1.6 KiB
C++
56 lines
1.6 KiB
C++
/*
|
|
* © 2020, Harald Barth
|
|
* © 2021, Neil McKechnie
|
|
*
|
|
* This file is part of Asbelos DCC-EX
|
|
*
|
|
* This is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* It is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with CommandStation. If not, see <https://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include "freeMemory.h"
|
|
|
|
// thanks go to https://github.com/mpflaga/Arduino-MemoryFree
|
|
#if defined(__arm__)
|
|
extern "C" char* sbrk(int);
|
|
#elif defined(__AVR__)
|
|
extern char *__brkval;
|
|
extern char *__malloc_heap_start;
|
|
#else
|
|
#error Unsupported board type
|
|
#endif
|
|
|
|
|
|
static volatile int minimum_free_memory = 32767;
|
|
|
|
|
|
int freeMemory() {
|
|
char top;
|
|
#if defined(__arm__)
|
|
return &top - reinterpret_cast<char*>(sbrk(0));
|
|
#elif defined(__AVR__)
|
|
return __brkval ? &top - __brkval : &top - __malloc_heap_start;
|
|
#else
|
|
#error bailed out alredy above
|
|
#endif
|
|
}
|
|
|
|
// Update low ram level. Allow for extra bytes to be specified
|
|
// by estimation or inspection, that may be used by other
|
|
// called subroutines.
|
|
int updateMinimumFreeMemory(unsigned char extraBytes) {
|
|
int spare = freeMemory()-extraBytes;
|
|
if (spare < minimum_free_memory) minimum_free_memory = spare;
|
|
return minimum_free_memory;
|
|
}
|