marlin/Marlin/src/HAL/HAL_AVR/HAL_AVR.cpp

/* **************************************************************************

 Marlin 3D Printer Firmware
 Copyright (C) 2016 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]

 Copyright (c) 2016 Bob Cousins bobcousins42@googlemail.com
 
 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/>.

****************************************************************************/

/**
 * Description: HAL for AVR
 *
 * For ARDUINO_ARCH_AVR
 */


#ifdef ARDUINO_ARCH_AVR

// --------------------------------------------------------------------------
// Includes
// --------------------------------------------------------------------------

#include "../HAL.h"
#include "../../../macros.h"

// --------------------------------------------------------------------------
// Externals
// --------------------------------------------------------------------------

// --------------------------------------------------------------------------
// Local defines
// --------------------------------------------------------------------------

// --------------------------------------------------------------------------
// Types
// --------------------------------------------------------------------------

// --------------------------------------------------------------------------
// Variables
// --------------------------------------------------------------------------

// --------------------------------------------------------------------------
// Public Variables
// --------------------------------------------------------------------------

//uint8_t MCUSR;

// --------------------------------------------------------------------------
// Private Variables
// --------------------------------------------------------------------------

// --------------------------------------------------------------------------
// Function prototypes
// --------------------------------------------------------------------------

// --------------------------------------------------------------------------
// Private functions
// --------------------------------------------------------------------------

// --------------------------------------------------------------------------
// Public functions
// --------------------------------------------------------------------------

#if ENABLED(SDSUPPORT)
  #include "../../../SdFatUtil.h"
  int freeMemory() { return SdFatUtil::FreeRam(); }
#else

extern "C" {
  extern char __bss_end;
  extern char __heap_start;
  extern void* __brkval;

  int freeMemory() {
    int free_memory;
    if ((int)__brkval == 0)
      free_memory = ((int)&free_memory) - ((int)&__bss_end);
    else
      free_memory = ((int)&free_memory) - ((int)__brkval);
    return free_memory;
  }
}

#endif //!SDSUPPORT

#endif