/* Init irq param with the given usart hardware instance.  */
static void _usart_init_irq_param(const void *const hw, struct _usart_async_device *dev)
/* Init irq param with the given usart hardware instance.  */
static void _usart_init_irq_param(const void *const hw, struct _usart_async_device *dev)
{
	if (hw == USART1) {
		_usart1_dev = dev;
	}
}