nes-proj/core/dev/slip.h

87 lines
3.0 KiB
C

/* -*- 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.
*
*/
#ifndef SLIP_H_
#define SLIP_H_
#include "contiki.h"
PROCESS_NAME(slip_process);
/**
* Send an IP packet from the uIP buffer with SLIP.
*/
uint8_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);
uint8_t slip_write(const void *ptr, int len);
/* Did we receive any bytes lately? */
extern uint8_t slip_active;
/* Statistics. */
extern uint16_t slip_rubbish, slip_twopackets, slip_overflow, slip_ip_drop;
/**
* Set a function to be called when there is activity on the SLIP
* interface; used for detecting if a node is a gateway node.
*/
void slip_set_input_callback(void (*callback)(void));
/*
* These machine dependent functions and an interrupt service routine
* must be provided externally (slip_arch.c).
*/
void slip_arch_init(unsigned long ubr);
void slip_arch_writeb(unsigned char c);
#endif /* SLIP_H_ */