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/* serial.c */
/*  {{{
 *
 * Copyright (C) 2003 Nicolas Schodet
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 * Contact :
 *        Web: http://perso.efrei.fr/~schodet/
 *      Email: <contact@ni.fr.eu.org>
 * }}} */
#include <serial.h>

#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

/* +AutoDec */
/* -AutoDec */

/* Les variables globales, c'est mal. */
static int serial_busp_fd = -1;

/* Ouvre le port s�rie. */
int
serial_busp_init (const char *file)
{
    serial_busp_fd = open (file, O_RDONLY);
    return serial_busp_fd;
}

/* Ferme le port s�rie. */
void
serial_busp_uninit (void)
{
    close (serial_busp_fd);
}

/* Ecrit un octet. */
void
serial_busp_write (int addr, int data)
{
    unsigned char c;
    c = addr & 0x0f;
    write (serial_busp_fd, &c, 1);
    c = data;
    write (serial_busp_fd, &c, 1);
}

/* Lit un octet. */
int
serial_busp_read (int addr)
{
    unsigned char c, c2;
    c = (addr & 0x0f) | 0x10;
    write (serial_busp_fd, &c, 1);
    read (serial_busp_fd, &c2, 1);
    // if (c != c2) ...
    read (serial_busp_fd, &c, 1);
    return c;
}