/*
 *  COM.H Copyright (C) 1990 by Mark R. Nelson
 *
 * This header file contains the structures, constants, and function
 * prototypes necessary to use the RS-232 routines in COM.C
 */

/*
 * This structure defines an RS-232 port.
 */
typedef struct {
    unsigned int   address;        /* Address of the 8250                */
    char           buffer[256];    /* The receive buffer.                */
    unsigned char  head;           /* Offset for insertion into the buff.*/
    unsigned char  tail;           /* Offset for removal from the buffer.*/
    unsigned char  match;          /* The status register match value    */
} PORT ;

typedef struct {
    unsigned int   status_address;     /* Address of the boards status reg.  */
    unsigned char  irq_mask;           /* The 8259 bits to set for this port */
    unsigned char  int_number;         /* The interrupt number for this port.*/
    void (interrupt far *old_vector)();/* The saved old interrupt vector.    */
    PORT           *ports[4];          /* Ports for this board               */
    int            port_count;         /* Number of ports currently open     */
} BOARD;

BOARD  *board_open( unsigned int address, unsigned char int_number );
PORT   *port_open( BOARD *board, unsigned int address, unsigned char match );
void    port_set(PORT *port, long speed, char parity, int data, int stopbits);
void    port_close( PORT *port );
void    board_close( BOARD *board );
void    port_putc( PORT *port, unsigned char c);
int     port_getc( PORT *port );

#ifdef M_I86
#define inportb inp
#define outportb outp
#define getvect _dos_getvect
#define setvect _dos_setvect
#endif