/* header file for the comm_int.obj functions */
/* <%Z%%M% %Q% sccs %I%> */
/****************************************************************************
com_int.h:    Date Written: 11/3/95             Written by: John LaBatt
                   Project: COMDEMO.MAK
                   Purpose: 
                     This is the include file for our structure for opening a
                     com port the functions are located in comm_int.obj
****************************************************************************/
                                                         
/* constants for the different settings for the com port */
#define BAUD38400 0x120
#define BAUD19200 0x100
#define BAUD9600 0xE0
#define BAUD4800 0xC0
#define BAUD2400 0xA0
#define BAUD1200 0x80
#define BAUD600 0x60
#define BAUD300 0x40
#define BAUD150 0x20
#define BAUD110 0x00

#define NOPARITY 0x00
#define ODDPARITY 0x08
#define EVENPARITY 0x18

#define STOP1 0x00
#define STOP2 0x04

#define BITS7 0x02
#define BITS8 0x03

/* XONXOFF for both modem_ready, modem_ctrl */
#define XONXOFF 0x04  /* XON/XOFF handshake */
/* CTS, DSR, RI, DCD for modem_ready/modem_status only */
#define CTS         0x10 /* CTS in  */
#define DSR         0x20 /* DSR in  */
#define DCD         0x80 /* DCD in  */
#define RI          0x40 /* RI  in  (not usable as handshake) */
/* RTS, DTR for modem_ctrl */
#define RTS         0x02 /* RTS out */
#define DTR         0x01 /* DTR out */

#define BSIZE 255

#define ByTe unsigned char /* funny caps so don't interfere with user */

typedef
  struct
  {
    int     num;          /* 0 to 3, 0 = COM1, 1 = COM2, etc.            */
    int     intr;         /* 2 to 15, interrupt line                     */
    int     intr_ctrl;    /* interrupt controller address                */
    ByTe    mask;         /* my interrupt mask bit                       */
    ByTe    old_mask;     /* old interrupt mask bit                      */
    long    old_vec;      /* saved interrupt vector for this line        */
    int     mode;         /* != 0 => new mode setting                    */
    int     old_DL;       /* save area for old baud divisor              */
    ByTe    old_LCR;      /* save area for old line control register     */
    ByTe    old_MCR;      /* save area for old modem control register    */
    ByTe    old_IER;      /* save area for old intr enable register      */
    ByTe    pend_XONXOFF; /* != 0 => this XON or XOFF must be sent       */
    int     addr;         /* port I/O address, 0 => set by open_comm     */
    int     start_rcv;    /* buf_used count to allow new chars           */
    int     stop_rcv;     /* buf_used count to disallow new chars        */
    ByTe    modem_status; /* current modem status register               */
    ByTe    modem_ready;  /* modem status bits for output handshake      */
    ByTe    modem_on;     /* modem control bits currently on             */
    ByTe    modem_ctrl;   /* modem control bits to be used for handshake */
  } CoMm_PoRt;

typedef
  struct
  {
    char far*  buf;       /* pointer to character buffer             */ 
    char far*  buf_end;   /* pointer past end of character buffer    */ 
    int     size;         /* size of buffer                          */ 
    int     used;         /* chars in buffer                         */ 
    char far*  buf_get;   /* points to next char to read from buffer */ 
    char far*  buf_put;   /* points to next free space in buffer     */ 
  } CoMm_BuFfEr;

typedef 
  struct comm_cb_s
  {
    CoMm_PoRt      port;   /* port information */
    CoMm_BuFfEr    inbuf;  /* input buffer     */
    CoMm_BuFfEr    outbuf; /* output buffer    */
  } COMM_CB;

extern COMM_CB com_port;
extern char inchars[];
extern char outchars[];

#define comm_cb(name,num,mode,modem_ready,i_modem_ctrl,modem_ctrl,inb,outb) \
        COMM_CB name =                                             \
                    {{num,                                         \
                      num == 0 ? 4 : (num == 1 ? 3 : 0),           \
                      0,0,0,0,mode,0,0,0,0,0,0,                    \
                      sizeof inb - 40,sizeof inb - 20,             \
                      0,modem_ready,i_modem_ctrl,modem_ctrl},      \
                     {&inb[0],0,sizeof inb,0,0,0},                 \
                     {&outb[0],0,sizeof outb,0,0,0}                \
                    };

/* Prototypes for functions contained in comm_int.obj */
int far all_sent(struct comm_cb_s far *);
int far close_comm(struct comm_cb_s far *);
int far drop_RTS(struct comm_cb_s far *);
int far open_comm(struct comm_cb_s far *);
int far raise_RTS(struct comm_cb_s far *);
int far read_comm(struct comm_cb_s far *);
int far write_comm(struct comm_cb_s far *, int);