rs_rawio.c

T-kernel 的extension源代码

/*
 *----------------------------------------------------------------------
 *    T-Kernel / Standard Extension
 *
 *    Copyright (C) 2006 by Ken Sakamura. All rights reserved.
 *    T-Kernel / Standard Extension is distributed 
 *      under the T-License for T-Kernel / Standard Extension.
 *----------------------------------------------------------------------
 *
 *    Version:   1.00.00
 *    Released by T-Engine Forum(http://www.t-engine.org) at 2006/8/11.
 *
 *----------------------------------------------------------------------
 */

/*
 *	@(#)rs_rawio.c 
 *
 */

#include <basic.h>
#include <sys/consio.h>

#define TSD_RSG_RTN_M1	(-1)

/*----------------------------------------------------------------------
	Single character output to the RS port
----------------------------------------------------------------------*/
W RS_putchar(W c)
{
	UB	cc = (UB)c;
	return	console_out(RS_PORT, (B*)&cc, 1);
}
/*----------------------------------------------------------------------
        Single character output from the RS port
----------------------------------------------------------------------*/
W RS_getchar( void )
{
	UB	c;
	return (console_in(RS_PORT, (B*)&c, 1) != 0) ? c : TSD_RSG_RTN_M1;
}
/*----------------------------------------------------------------------
        IOCTL of the RS port
----------------------------------------------------------------------*/
W RS_ioctl(W req, W arg)
{
	return console_ctl(RS_PORT, req, arg);
}