Initial commit. Unusable Marlin 2.0.5.3 core without any custimization.

Marlin/src/sd/SdFatUtil.cpp

@@ -0,0 +1,60 @@
+/**
+ * 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 <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"
+#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));
+  }
+
+#else
+
+  extern char* __brkval;
+  extern char __bss_end;
+  int SdFatUtil::FreeRam() {
+    char top;
+    return __brkval ? &top - __brkval : &top - &__bss_end;
+  }
+
+#endif
+
+#endif // SDSUPPORT