rewrite freeMemory code

DCC.h

@@ -50,7 +50,7 @@ SKIPTARGET=0xFF  // jump to target
 // Allocations with memory implications..!
 // Base system takes approx 900 bytes + 8 per loco. Turnouts, Sensors etc are dynamically created
  #ifdef ARDUINO_AVR_UNO 
-  const byte MAX_LOCOS=20;
+  const byte MAX_LOCOS=30;
  #else 
   const byte MAX_LOCOS=50; 
  #endif              

config.example.h

@@ -37,7 +37,7 @@ The configuration file for DCC++ EX Command Station
 //
 // DEFINE NUMBER OF MAIN TRACK REGISTER
 
-#define MAX_MAIN_REGISTERS 12
+#define MAX_MAIN_REGISTERS 22
 
 /////////////////////////////////////////////////////////////////////////////////////
 //

freeMemory.cpp

@@ -0,0 +1,42 @@
+/*
+ *  © 2020, Harald Barth
+ *  
+ *  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
+
+
+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
+}

freeMemory.h

@@ -1,20 +1,23 @@
+/*
+ *  © 2020, Harald Barth
+ *  
+ *  This file is part of 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/>.
+ */
+
 #ifndef freeMemory_h
 #define freeMemory_h
-
+int freeMemory();
-// thanks go to  https://github.com/mpflaga/Arduino-MemoryFree
-#ifdef __arm__
-// should use uinstd.h to define sbrk but Due causes a conflict
-extern "C" char* sbrk(int incr);
-#else  // __ARM__
-extern char *__brkval;
-#endif  // __arm__
-
-int freeMemory() {
-  char top;
-#ifdef __arm__
-  return &top - reinterpret_cast<char*>(sbrk(0));
-#else  // __arm__
-  return __brkval ? &top - __brkval : &top - __malloc_heap_start;
-#endif  // __arm__
-}
 #endif