usart_mega16.h

avr单片机ATMEGA16

#ifndef _USART_MEGA16_H__
#define _USART_MEGA16_H__

// USART Receiver buffer
#define RX_BUFFER_SIZE 16
extern char rx_buffer[RX_BUFFER_SIZE];

#if RX_BUFFER_SIZE<256
	extern volatile unsigned char rx_wr_index,rx_rd_index,rx_counter;
#else
	extern volatile unsigned int rx_wr_index,rx_rd_index,rx_counter;
#endif

// This flag is set on USART Receiver buffer overflow
extern unsigned char rx_buffer_overflow;

// USART Transmitter buffer
#define TX_BUFFER_SIZE 16
extern char tx_buffer[TX_BUFFER_SIZE];

#if TX_BUFFER_SIZE<256
	extern volatile unsigned char tx_wr_index,tx_rd_index,tx_counter;
#else
	extern volatile unsigned int tx_wr_index,tx_rd_index,tx_counter;
#endif

extern volatile unsigned char USART_FLAG;

void init_USART(void);
unsigned char get_c(void);
void put_c(unsigned char c);
void put_hex(unsigned char num);
void put_s(unsigned char *s);
void put_s_P(unsigned char *P);
void put_sp(unsigned char i);
void put_ok(void);
void put_cr(void);
#endif