/* allocate several continuous blocks of free memory from PSRAM.  */
void* Psram_reserve_calloc(int num, int size)
/* allocate several continuous blocks of free memory from PSRAM.  */
void* Psram_reserve_calloc(int num, int size)
{
	void *mem;
	if ((mem = Psram_reserve_malloc(num * size)))
		memset(mem, 0, num * size);
	return mem;
}