serial.h

国外网站上的一些精典的C程序

/*
+----------------------------------------------------+
|               Thunderbird Software                 |
+----------------------------------------------------+
| Filespec  :  Serial.c                              |
| Date      :  October 24, 1991                      |
| Time      :  15:03                                 |
| Revision  :  1.1                                   |
| Update    : August 29, 1994                        |
| Update    : March 12, 1995 by Bob Stout            |
+----------------------------------------------------+
| Programmer:  Scott Andrews                         |
| Address   :  5358 Summit RD SW                     |
| City/State:  Pataskala, Ohio                       |
| Zip       :  43062                                 |
+----------------------------------------------------+
| Released to the Public Domain                      |
+----------------------------------------------------+
*/

#ifndef SERIAL__H
#define SERIAL__H

#include "extkword.h"
#include "pchwio.h"

#define  SerInBufSize  4096            /* Size of input buffer          */
#define  SerOutBufSize 512             /* Size of output buffer         */

/* 8250 registers */

#define  REC             0             /* Uart receive reg.             */
#define  XMIT            0             /* Uart transmit reg.            */
#define  INT_EN          1             /* Uart int. enable reg.         */
#define  INT_ID          2             /* Uart int. ident. reg.         */
#define  LINE_CNTRL      3             /* Uart line control reg.        */
#define  MODEM_CNTRL     4             /* Uart modem control reg.       */
#define  LINE_STATUS     5             /* Uart line status reg.         */
#define  MODEM_STATUS    6             /* Uart modem status reg.        */
#define  BAUD_LSB        0             /* Uart baud divisor reg.        */
#define  BAUD_MSB        1             /* Uart baud divisor reg.        */

#define  NONE            0             /* Handshake param none          */
#define  HDW             1             /* Handshake param hardware      */
#define  XON             2             /* Handshake param software      */

/* Interrupt enable register  */

#define  RX_INT          0x01          /* Receive interrupt mask        */
#define  TBE_INT         0x02          /* Transmit buffer empty mask    */
#define  ERR_INT         0x04          /* Error interrupt mask          */
#define  RS_INT          0x08          /* Line interrupt mask           */

/* Interrupt id register      */

#define  OUT2            0x08          /* Out 2 line                    */
#define  DTR             0x01          /* DTR high                      */
#define  RTS             0x02          /* RTS high                      */
#define  CTS             0x10
#define  DSR             0x20
#define  XMTRDY          0x20
#define  TXR             0       /*  Transmit register (WRITE)          */

#if !defined TRUE                      /* Define boolean true/false     */
#define  FALSE  0
#define  TRUE   !FALSE
#endif

extern void (INTERRUPT FAR *oldvector_serial )( void);

extern int   ComBase;                  /* Comm port address             */
extern int   IrqNum;                   /* Comm interrupt request        */

typedef struct                         /* Save existing comm params     */
{  int int_enable;                     /* old interrupt enable reg value*/
   int line;                           /*  "  line control      "    "  */
   int modem;                          /* old modem control     "    "  */
   int baud_lsb;                       /* old baud rate divisor LSD     */
   int baud_msb;                       /*  "   "    "      "    MSD     */
   int int_cntrl;                      /* old PIC interrupt reg value   */
} OLD_COMM_PARAMS;
extern OLD_COMM_PARAMS old_comm_params;

typedef struct
{  int line;                           /* Uart line status reg.         */
   int modem;                          /* Uart mode status reg.         */
   int intrupt;                        /* Uart interrupt reg.           */
   int handshake;                      /* Handshake status              */
} COMM_STATUS;                         /* status, updated, handler      */
extern COMM_STATUS comm_status;

int   OpenComPort ( char Port );         /*setup comm for usage         */
void  InitComPort ( char Baud[], char Databits, char Parity, char Stop );
void  CloseComPort ( void );             /* Restore comm port           */
void  DropDtr ( void );                  /* Lower DTR                   */
void  RaiseDtr ( void );                 /* Raise DTR                   */
int   ComRecChar ( void );               /* Fetch character from rcv buf*/

int   ComSendChar ( char character );    /* Put char into xmit buffer   */
int   ComSendString ( char *string );
int   ComStatus ( void );                /* Fetch comm status           */
void  INTERRUPT FAR serial ( void );     /* interrupt handler           */

/* End of Serial.H */

#endif /* SERIAL__H */