nes-proj/core/dev/slip.h

/* -*- C -*- */
/*
 * Copyright (c) 2005, Swedish Institute of Computer Science
 * All rights reserved. 
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions 
 * are met: 
 * 1. Redistributions of source code must retain the above copyright 
 *    notice, this list of conditions and the following disclaimer. 
 * 2. Redistributions in binary form must reproduce the above copyright 
 *    notice, this list of conditions and the following disclaimer in the 
 *    documentation and/or other materials provided with the distribution. 
 * 3. Neither the name of the Institute nor the names of its contributors 
 *    may be used to endorse or promote products derived from this software 
 *    without specific prior written permission. 
 *
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
 * SUCH DAMAGE. 
 *
 * This file is part of the Contiki operating system.
 * 
 * @(#)$Id: slip.h,v 1.3 2007/01/23 12:29:50 bg- Exp $
 */

#ifndef __SLIP_H__
#define __SLIP_H__

#include "contiki.h"

PROCESS_NAME(slip_process);

/**
 * Send an IP packet from the uIP buffer with SLIP.
 */
u8_t slip_send(void);

/**
 * Input a SLIP byte.
 *
 * This function is called by the RS232/SIO device driver to pass
 * incoming bytes to the SLIP driver. The function can be called from
 * an interrupt context.
 *
 * For systems using low-power CPU modes, the return value of the
 * function can be used to determine if the CPU should be woken up or
 * not. If the function returns non-zero, the CPU should be powered
 * up. If the function returns zero, the CPU can continue to be
 * powered down.
 *
 * \param c The data that is to be passed to the SLIP driver
 *
 * \return Non-zero if the CPU should be powered up, zero otherwise. 
 */
int slip_input_byte(unsigned char c);

u8_t slip_write(const void *ptr, int len);

/* Did we receive any bytes lately? */
extern u8_t slip_active;

/* Statistics. */
extern u16_t slip_rubbish, slip_twopackets, slip_overflow, slip_ip_drop;

/*
 * These machine dependent functions and an interrupt service routine
 * must be provided externally (slip_arch.c).
 */
void slip_arch_init(void);
void slip_arch_writeb(unsigned char c);

#endif /* __SLIP_H__ */