nes-proj/examples/ipv6/slip-radio/slip-net.c

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/*
* Copyright (c) 2011, 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.
*/
#include "contiki.h"
#include "net/netstack.h"
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#include "net/ipv6/uip.h"
#include "net/packetbuf.h"
#include "dev/slip.h"
#include <stdio.h>
#define SLIP_END 0300
#define SLIP_ESC 0333
#define SLIP_ESC_END 0334
#define SLIP_ESC_ESC 0335
#define DEBUG 0
/*---------------------------------------------------------------------------*/
void
slipnet_init(void)
{
}
/*---------------------------------------------------------------------------*/
void
slip_send_packet(const uint8_t *ptr, int len)
{
uint16_t i;
uint8_t c;
slip_arch_writeb(SLIP_END);
for(i = 0; i < len; ++i) {
c = *ptr++;
if(c == SLIP_END) {
slip_arch_writeb(SLIP_ESC);
c = SLIP_ESC_END;
} else if(c == SLIP_ESC) {
slip_arch_writeb(SLIP_ESC);
c = SLIP_ESC_ESC;
}
slip_arch_writeb(c);
}
slip_arch_writeb(SLIP_END);
}
/*---------------------------------------------------------------------------*/
void
slipnet_input(void)
{
int i;
/* radio should be configured for filtering so this should be simple */
/* this should be sent over SLIP! */
/* so just copy into uip-but and send!!! */
/* Format: !R<data> ? */
uip_len = packetbuf_datalen();
i = packetbuf_copyto(uip_buf);
if(DEBUG) {
printf("Slipnet got input of len: %d, copied: %d\n",
packetbuf_datalen(), i);
for(i = 0; i < uip_len; i++) {
printf("%02x", (unsigned char) uip_buf[i]);
if((i & 15) == 15) printf("\n");
else if((i & 7) == 7) printf(" ");
}
printf("\n");
}
/* printf("SUT: %u\n", uip_len); */
slip_send_packet(uip_buf, uip_len);
}
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static uint8_t
slipnet_output(const linkaddr_t *localdest)
{
/* do nothing... */
return 1;
}
/*---------------------------------------------------------------------------*/
const struct network_driver slipnet_driver = {
"slipnet",
slipnet_init,
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slipnet_input,
/* output is likely never called - or at least not used as no IP packets
should be produced in slip-radio */
slipnet_output
};
/*---------------------------------------------------------------------------*/