text: /*
   * Copyright (c) 2001, 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 lwIP TCP/IP stack.
   * 
   * Author: Adam Dunkels <adam@sics.se>
   *
   */
  #ifndef LWIP_HDR_NETIF_SLIPIF_H
  #define LWIP_HDR_NETIF_SLIPIF_H
  
  #include "lwip/opt.h"
  #include "lwip/netif.h"
  
  /** Set this to 1 to start a thread that blocks reading on the serial line
   * (using sio_read()).
   */
  #ifndef SLIP_USE_RX_THREAD
  #define SLIP_USE_RX_THREAD !NO_SYS
  #endif
  
  /** Set this to 1 to enable functions to pass in RX bytes from ISR context.
   * If enabled, slipif_received_byte[s]() process incoming bytes and put assembled
   * packets on a queue, which is fed into lwIP from slipif_poll().
   * If disabled, slipif_poll() polls the serial line (using sio_tryread()).
   */
  #ifndef SLIP_RX_FROM_ISR
  #define SLIP_RX_FROM_ISR 0
  #endif
  
  /** Set this to 1 (default for SLIP_RX_FROM_ISR) to queue incoming packets
   * received by slipif_received_byte[s]() as long as PBUF_POOL pbufs are available.
   * If disabled, packets will be dropped if more than one packet is received.
   */
  #ifndef SLIP_RX_QUEUE
  #define SLIP_RX_QUEUE SLIP_RX_FROM_ISR
  #endif
  
  #ifdef __cplusplus
  extern "C" {
  #endif
  
  err_t slipif_init(struct netif * netif);
  void slipif_poll(struct netif *netif);
  #if SLIP_RX_FROM_ISR
  void slipif_process_rxqueue(struct netif *netif);
  void slipif_received_byte(struct netif *netif, u8_t data);
  void slipif_received_bytes(struct netif *netif, u8_t *data, u8_t len);
  #endif /* SLIP_RX_FROM_ISR */
  
  #ifdef __cplusplus
  }
  #endif
   
  #endif /* LWIP_HDR_NETIF_SLIPIF_H */
  
  