Function freeRam

Arduino/libraries/ST_Anything/Everything.cpp:365–381

freeRam() function - useful in determining how much SRAM is available on Arduino

//freeRam() function - useful in determining how much SRAM is available on Arduino
long freeRam()
{
#if defined(ARDUINO_ARCH_AVR) 
	extern int __heap_start, *__brkval;
	int v;
	return (int)&v - (__brkval == 0 ? (int)&__heap_start : (int)__brkval);
#elif defined(ARDUINO_ARCH_ESP8266)
	return ESP.getFreeHeap();
#elif defined(ARDUINO_ARCH_SAMD)
	char top;
	return &top - reinterpret_cast<char*>(sbrk(0));
#else
	return -1;
#endif // !


}