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- /**
- * Marlin 3D Printer Firmware
- * Copyright (c) 2020 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 <https://www.gnu.org/licenses/>.
- *
- */
-
- /**
- * sd/SdFatUtil.cpp
- *
- * 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"
- #include <string.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));
- }
-
- #elif defined(__AVR__)
-
- extern char* __brkval;
- extern char __bss_end;
- int SdFatUtil::FreeRam() {
- char top;
- return __brkval ? &top - __brkval : &top - &__bss_end;
- }
-
- #endif
-
- #endif // SDSUPPORT
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