-#ifdef PS2_USE_USART
-# ifndef PS2_CLOCK_PORT
-# error "PS2_CLOCK_PORT has to be defined"
-# endif
-# ifndef PS2_CLOCK_PIN
-# error "PS2_CLOCK_PIN has to be defined"
-# endif
-# ifndef PS2_CLOCK_DDR
-# error "PS2_CLOCK_DDR has to be defined"
-# endif
-# ifndef PS2_CLOCK_BIT
-# error "PS2_CLOCK_BIT has to be defined"
-# endif
-# ifndef PS2_DATA_PORT
-# error "PS2_DATA_PORT has to be defined"
-# endif
-# ifndef PS2_DATA_PIN
-# error "PS2_DATA_PIN has to be defined"
-# endif
-# ifndef PS2_DATA_DDR
-# error "PS2_DATA_DDR has to be defined"
-# endif
-# ifndef PS2_DATA_BIT
-# error "PS2_DATA_BIT has to be defined"
-# endif
-# ifndef PS2_USART_INIT
-# error "PS2_USART_INIT has to be defined"
-# endif
-# ifndef PS2_USART_RX_INT_ON
-# error "PS2_USART_RX_INT_ON has to be defined"
-# endif
-# ifndef PS2_USART_RX_POLL_ON
-# error "PS2_USART_RX_POLL_ON has to be defined"
-# endif
-# ifndef PS2_USART_OFF
-# error "PS2_USART_OFF has to be defined"
-# endif
-# ifndef PS2_USART_RX_READY
-# error "PS2_USART_RX_READY has to be defined"
-# endif
-# ifndef PS2_USART_RX_DATA
-# error "PS2_USART_RX_DATA has to be defined"
-# endif
-# ifndef PS2_USART_ERROR
-# error "PS2_USART_ERROR has to be defined"
-# endif
-# ifndef PS2_USART_RX_VECT
-# error "PS2_USART_RX_VECT has to be defined"
-# endif