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60 lines
1.4 KiB
C++

/**
* Marlin 3D Printer Firmware
* Copyright (C) 2016 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
*
* Based on Sprinter and grbl.
* Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
*
* This program 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.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
/**
* Arduino SdFat Library
* Copyright (C) 2008 by William Greiman
*
* This file is part of the Arduino Sd2Card Library
*/
#include "../inc/MarlinConfig.h"
#if ENABLED(SDSUPPORT)
#include "SdFatUtil.h"
/**
* Amount of free RAM
* \return The number of free bytes.
*/
#ifdef __arm__
extern "C" char* sbrk(int incr);
int SdFatUtil::FreeRam() {
char top;
return &top - reinterpret_cast<char*>(sbrk(0));
}
#else
extern char* __brkval;
extern char __bss_end;
int SdFatUtil::FreeRam() {
char top;
return __brkval ? &top - __brkval : &top - &__bss_end;
}
#endif
#endif // SDSUPPORT