usart.h

AVR的SPI的通信例子

#ifndef __USART_H__
#define __USART_H__
#include "main.h"
#define RXB8 1
#define TXB8 0
#define UPE 2
#define OVR 3
#define FE 4
#define UDRE 5
#define RXC 7

#define FRAMING_ERROR (1<<FE)
#define PARITY_ERROR (1<<UPE)
#define DATA_OVERRUN (1<<OVR)
#define DATA_REGISTER_EMPTY (1<<UDRE)
#define RX_COMPLETE (1<<RXC)

#define RX_BUFFER_SIZE 50
#define TX_BUFFER_SIZE 20

#define   BAUD            (38400)
#define   BAUDH           (((OSC_FREQ/BAUD)/8-1)/256)
#define   BAUDL           (((OSC_FREQ/BAUD)/8-1)%256)


void  USART_Init(void);
void  PutChar(INT8U);
INT8U GetChar(void);


#endif