FreeStack.h

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#ifndef FreeStack_h
#define FreeStack_h
#include <stdint.h>
#if defined(__AVR__) || defined(DOXYGEN)
#include <avr/io.h>
#define HAS_UNUSED_STACK 1
extern char *__brkval;
extern char __bss_end;
inline int FreeStack()
{
    char *sp = reinterpret_cast<char *>(SP);
    return __brkval ? sp - __brkval : sp - &__bss_end;
}
#elif defined(ARDUINO_ARCH_APOLLO3)
#define HAS_UNUSED_STACK 0
#elif defined(PLATFORM_ID) // Particle board
#include "Arduino.h"
inline int FreeStack()
{
    return System.freeMemory();
}
#elif defined(__IMXRT1062__)
#define HAS_UNUSED_STACK 1
extern uint8_t _ebss;
inline int FreeStack()
{
    register uint32_t sp asm("sp");
    return reinterpret_cast<char *>(sp) - reinterpret_cast<char *>(&_ebss);
}
#elif defined(__arm__)
#define HAS_UNUSED_STACK 1
extern "C" char *sbrk(int incr);
inline int FreeStack()
{
    register uint32_t sp asm("sp");
    return reinterpret_cast<char *>(sp) - reinterpret_cast<char *>(sbrk(0));
}
#else // defined(__AVR__) || defined(DOXYGEN)
#ifndef FREE_STACK_CPP
#warning FreeStack is not defined for this system.
#endif // FREE_STACK_CPP
inline int FreeStack()
{
    return 0;
}
#endif // defined(__AVR__) || defined(DOXYGEN)
#if defined(HAS_UNUSED_STACK) || defined(DOXYGEN)
void FillStack();
int UnusedStack();
#else // HAS_UNUSED_STACK
#define HAS_UNUSED_STACK 0
inline void FillStack()
{
}
inline int UnusedStack()
{
    return 0;
}
#endif // defined(HAS_UNUSED_STACK)
#endif // FreeStack_h