36 #ifndef USART_SPI_H_INCLUDED    37 #define USART_SPI_H_INCLUDED    42 # include "xmega_usart_spi/usart_spi.h"    44 # include "megarf_usart_spi/usart_spi.h"    46 # include "uc3_usart_spi/usart_spi.h"    50 # error Unsupported chip type Atmel part identification macros. 
 
SAM USART in SPI mode driver functions.