/* Arduino SdFat Library
 * Copyright (C) 2008 by William Greiman
 *
 * This file is part of the Arduino SdFat Library
 *
 * This Library 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 Library 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 the Arduino SdFat Library.  If not, see
 * <http://www.gnu.org/licenses/>.
 */
#include "Marlin.h"

#ifdef 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  // __arm__
extern char *__brkval;
extern char __bss_end;
/** Amount of free RAM
 * \return The number of free bytes.
 */
int SdFatUtil::FreeRam() {
  char top;
  return __brkval ? &top - __brkval : &top - &__bss_end;
}
#endif  // __arm

void SdFatUtil::set_stack_guard()
{	
	uint32_t *stack_guard;

	stack_guard = (uint32_t*)&__bss_end;
    *stack_guard = STACK_GUARD_TEST_VALUE;
}

bool SdFatUtil::test_stack_integrity()
{
	uint32_t* stack_guard = (uint32_t*)&__bss_end;
	return (*stack_guard == STACK_GUARD_TEST_VALUE);
}

uint32_t SdFatUtil::get_stack_guard_test_value()
{
	uint32_t* stack_guard;
	uint32_t output;
	stack_guard = (uint32_t*)&__bss_end;
	output = *stack_guard;
	return(output);
}
//------------------------------------------------------------------------------
/** %Print a string in flash memory.
 *
 * \param[in] pr Print object for output.
 * \param[in] str Pointer to string stored in flash memory.
 */
void SdFatUtil::print_P( PGM_P str) {
  for (uint8_t c; (c = pgm_read_byte(str)); str++) MYSERIAL.write(c);
}
//------------------------------------------------------------------------------
/** %Print a string in flash memory followed by a CR/LF.
 *
 * \param[in] pr Print object for output.
 * \param[in] str Pointer to string stored in flash memory.
 */
void SdFatUtil::println_P( PGM_P str) {
  print_P( str);
  MYSERIAL.println();
}
//------------------------------------------------------------------------------
/** %Print a string in flash memory to Serial.
 *
 * \param[in] str Pointer to string stored in flash memory.
 */
void SdFatUtil::SerialPrint_P(PGM_P str) {
  print_P(str);
}
//------------------------------------------------------------------------------
/** %Print a string in flash memory to Serial followed by a CR/LF.
 *
 * \param[in] str Pointer to string stored in flash memory.
 */
void SdFatUtil::SerialPrintln_P(PGM_P str) {
  println_P( str);
}
#endif