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Import of the contiki-2.x development code from the SICS internal CVS server

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adamdunkels 2006-06-17 22:41:10 +00:00
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core/net/slipdev.c Normal file
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/**
* \addtogroup uip
* @{
*/
/**
* \defgroup slip Serial Line IP (SLIP) protocol
* @{
*
* The SLIP protocol is a very simple way to transmit IP packets over
* a serial line. It does not provide any framing or error control,
* and is therefore not very widely used today.
*
* This SLIP implementation requires two functions for accessing the
* serial device: slipdev_char_poll() and slipdev_char_put(). These
* must be implemented specifically for the system on which the SLIP
* protocol is to be run.
*/
/**
* \file
* SLIP protocol implementation
* \author Adam Dunkels <adam@dunkels.com>
*/
/*
* Copyright (c) 2001, Adam Dunkels.
* 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. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 uIP TCP/IP stack.
*
* $Id: slipdev.c,v 1.1 2006/06/17 22:41:18 adamdunkels Exp $
*
*/
/*
* This is a generic implementation of the SLIP protocol over an RS232
* (serial) device.
*
* Huge thanks to Ullrich von Bassewitz <uz@cc65.org> of cc65 fame for
* and endless supply of bugfixes, insightsful comments and
* suggestions, and improvements to this code!
*/
#include "uip.h"
#include "uip-fw.h"
#include "slipdev.h"
#include <string.h> /* For memcpy() */
#define SLIP_END 0300
#define SLIP_ESC 0333
#define SLIP_ESC_END 0334
#define SLIP_ESC_ESC 0335
static u8_t slip_buf[UIP_BUFSIZE];
static u16_t len, tmplen;
static u8_t lastc;
/*-----------------------------------------------------------------------------------*/
/**
* Send the packet in the uip_buf and uip_appdata buffers using the
* SLIP protocol.
*
* The first 40 bytes of the packet (the IP and TCP headers) are read
* from the uip_buf buffer, and the following bytes (the application
* data) are read from the uip_appdata buffer.
*
* \return This function will always return UIP_FW_OK.
*/
/*-----------------------------------------------------------------------------------*/
u8_t
slipdev_send(void)
{
u16_t i;
u8_t *ptr;
u8_t c;
slipdev_char_put(SLIP_END);
ptr = &uip_buf[UIP_LLH_LEN];
for(i = 0; i < uip_len; ++i) {
if(i == UIP_TCPIP_HLEN) {
ptr = (char *)uip_appdata;
}
c = *ptr++;
switch(c) {
case SLIP_END:
slipdev_char_put(SLIP_ESC);
slipdev_char_put(SLIP_ESC_END);
break;
case SLIP_ESC:
slipdev_char_put(SLIP_ESC);
slipdev_char_put(SLIP_ESC_ESC);
break;
default:
slipdev_char_put(c);
break;
}
}
slipdev_char_put(SLIP_END);
return UIP_FW_OK;
}
/*-----------------------------------------------------------------------------------*/
/**
* Poll the SLIP device for an available packet.
*
* This function will poll the SLIP device to see if a packet is
* available. It uses a buffer in which all avaliable bytes from the
* RS232 interface are read into. When a full packet has been read
* into the buffer, the packet is copied into the uip_buf buffer and
* the length of the packet is returned.
*
* \return The length of the packet placed in the uip_buf buffer, or
* zero if no packet is available.
*/
/*-----------------------------------------------------------------------------------*/
u16_t
slipdev_poll(void)
{
u8_t c;
while(slipdev_char_poll(&c)) {
switch(c) {
case SLIP_ESC:
lastc = c;
break;
case SLIP_END:
lastc = c;
/* End marker found, we copy our input buffer to the uip_buf
buffer and return the size of the packet we copied. */
memcpy(&uip_buf[UIP_LLH_LEN], slip_buf, len);
tmplen = len;
len = 0;
return tmplen;
default:
if(lastc == SLIP_ESC) {
lastc = c;
/* Previous read byte was an escape byte, so this byte will be
interpreted differently from others. */
switch(c) {
case SLIP_ESC_END:
c = SLIP_END;
break;
case SLIP_ESC_ESC:
c = SLIP_ESC;
break;
}
} else {
lastc = c;
}
slip_buf[len] = c;
++len;
if(len > UIP_BUFSIZE) {
len = 0;
}
break;
}
}
return 0;
}
/*-----------------------------------------------------------------------------------*/
/**
* Initialize the SLIP module.
*
* This function does not initialize the underlying RS232 device, but
* only the SLIP part.
*/
/*-----------------------------------------------------------------------------------*/
void
slipdev_init(void)
{
lastc = len = 0;
}
/*-----------------------------------------------------------------------------------*/
/** @} */
/** @} */