50 | 8 4
*ps = c;
ps++;
}
*ps = 0;
}
/* send a character to serial port */
void send_port( int port,char c )
{
union REGS r;
r.x.dx = port; /* serial port */
r.h.ah = 1; /* int14 function1:send character */
r.h.al = c; /* character to be sent */
int86( 0x14,&r,&r );
if( r.h.ah & 128 ) /* check ah.7,if set by int86( 0x14,&r,&r ),mean trans error */
{ printf( "\nE00:Serial port send error!" );
exit(1);
}
}
/* read a character from serial port */
char read_port( int port )
{ union REGS r;
r.x.dx = port; /* serial port */
r.h.ah = 2; /* int14 function2:read character */
int86( 0x14,&r,&r );
if( r.h.ah & 128 ) /* if ah.7 be set,mean trans error */
{ printf( "\nE01:Serial port read error!" );
exit(1);
}
return r.h.al;
}
/* check the status of serial port */
int check_stat( int port )
{ union REGS r;
r.x.dx = port; /* serial port */
r.h.ah = 3; /* int14 function3:read status */
int86( 0x14,&r,&r );
return r.x.ax; /* ax.7 show serial operation, ax.8 show serial recive ready */
/* initialize the serial port */
void port_init( int port,unsigned char code )
