void _delay_cycles(void *const hw, uint32_t cycles)
{
	(void)hw;
	uint8_t  n   = cycles >> 24;
	uint32_t buf = cycles;

	while (n--) {
		SysTick->LOAD = 0xFFFFFF;
		SysTick->VAL  = 0xFFFFFF;
		while (!(SysTick->CTRL & SysTick_CTRL_COUNTFLAG_Msk))
			;
		buf -= 0xFFFFFF;
	}

	SysTick->LOAD = buf;
	SysTick->VAL  = buf;
	while (!(SysTick->CTRL & SysTick_CTRL_COUNTFLAG_Msk))
		;
}