usart2.h

来自「Hello ! This is Atmega spi driver sourc」· C头文件 代码 · 共 20 行

/* UART Buffer Defines */
#define USART_RX_BUFFER_SIZE 128     /* 2,4,8,16,32,64,128 or 256 bytes */
#define USART_TX_BUFFER_SIZE 128     /* 2,4,8,16,32,64,128 or 256 bytes */
#define USART_RX_BUFFER_MASK ( USART_RX_BUFFER_SIZE - 1 )
#define USART_TX_BUFFER_MASK ( USART_TX_BUFFER_SIZE - 1 )
#if ( USART_RX_BUFFER_SIZE & USART_RX_BUFFER_MASK )
	#error RX buffer size is not a power of 2
#endif
#if ( USART_TX_BUFFER_SIZE & USART_TX_BUFFER_MASK )
	#error TX buffer size is not a power of 2
#endif


/* Prototypes */
void USART_Init( unsigned int baudrate );
unsigned char USART_Receive( void );
void USART_Transmit( unsigned char data );