uart.h

用LPC936实现通过SPI扩展多个串口,在这里实现了对多个通道的管理,C代码,

#ifndef _UART_H
#define _UART_H

#include "queue.h"
#include <REG935.h>

#define BAUD_115200			0
#define BAUD_057600			1
#define BAUD_038400			2
#define BAUD_028800			3
#define BAUD_019200			4
#define BAUD_014400			5
#define BAUD_009600			6
#define BAUD_004800			7
#define BAUD_002400			8
#define BAUD_001200			9

#define RX_BUFFER_SIZE			32
#define TX_BUFFER_SIZE			32

#define MRX_BUFFER_SIZE			16
#define MTX_BUFFER_SIZE			16

#define DATA_EOF_FLAG			0x7e
#define MSG_EOF_FLAG			0xFF

sbit RTS = P1^2;
sbit CTS = P1^3;
sbit DSR = P1^4;
sbit DTR = P1^6;

extern unsigned char code baud_para[][2];
extern Queue idata tx_queue;
extern unsigned char xdata tx_buffer[];
extern Queue idata rx_queue;
extern unsigned char xdata rx_buffer[];
extern Queue idata mtx_queue;

extern bit tx_running;
extern bit term_ctr_enable;		//dtr dsr enable
extern bit flow_ctr_enable;		//cts rts enable

extern void init_uart(void);
extern bit open_uart(char baud);
//extern void close_uart(void);
extern int get_char(void);
extern bit send_char(char c);
extern void uart_scan(void);
extern int get_msg(void);
extern bit send_msg(char c);
#endif