Rahol Rajan / NetServices-Traffic

Used in Live Traffic Update Nokia LCD Display Project

Fork of NetServices by Segundo Equipo

lwip/netif/slipif.c@8:92b57208ab99, 2013-03-06 (annotated)

Committer:
rrajan8
Date:
Wed Mar 06 19:07:23 2013 +0000
Revision:
8:92b57208ab99
Parent:
0:ac1725ba162c 
This project utilizes mbed's networking features to display live traffic updates on the Nokia LCD using the MapQuest API's Traffic Web Service.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
segundo 0:ac1725ba162c 1 /**
segundo 0:ac1725ba162c 2 * @file
segundo 0:ac1725ba162c 3 * SLIP Interface
segundo 0:ac1725ba162c 4 *
segundo 0:ac1725ba162c 5 */
segundo 0:ac1725ba162c 6
segundo 0:ac1725ba162c 7 /*
segundo 0:ac1725ba162c 8 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
segundo 0:ac1725ba162c 9 * All rights reserved.
segundo 0:ac1725ba162c 10 *
segundo 0:ac1725ba162c 11 * Redistribution and use in source and binary forms, with or without
segundo 0:ac1725ba162c 12 * modification, are permitted provided that the following conditions
segundo 0:ac1725ba162c 13 * are met:
segundo 0:ac1725ba162c 14 * 1. Redistributions of source code must retain the above copyright
segundo 0:ac1725ba162c 15 * notice, this list of conditions and the following disclaimer.
segundo 0:ac1725ba162c 16 * 2. Redistributions in binary form must reproduce the above copyright
segundo 0:ac1725ba162c 17 * notice, this list of conditions and the following disclaimer in the
segundo 0:ac1725ba162c 18 * documentation and/or other materials provided with the distribution.
segundo 0:ac1725ba162c 19 * 3. Neither the name of the Institute nor the names of its contributors
segundo 0:ac1725ba162c 20 * may be used to endorse or promote products derived from this software
segundo 0:ac1725ba162c 21 * without specific prior written permission.
segundo 0:ac1725ba162c 22 *
segundo 0:ac1725ba162c 23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
segundo 0:ac1725ba162c 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
segundo 0:ac1725ba162c 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
segundo 0:ac1725ba162c 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
segundo 0:ac1725ba162c 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
segundo 0:ac1725ba162c 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
segundo 0:ac1725ba162c 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
segundo 0:ac1725ba162c 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
segundo 0:ac1725ba162c 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
segundo 0:ac1725ba162c 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
segundo 0:ac1725ba162c 33 * SUCH DAMAGE.
segundo 0:ac1725ba162c 34 *
segundo 0:ac1725ba162c 35 * This file is built upon the file: src/arch/rtxc/netif/sioslip.c
segundo 0:ac1725ba162c 36 *
segundo 0:ac1725ba162c 37 * Author: Magnus Ivarsson <magnus.ivarsson(at)volvo.com>
segundo 0:ac1725ba162c 38 */
segundo 0:ac1725ba162c 39
segundo 0:ac1725ba162c 40 /*
segundo 0:ac1725ba162c 41 * This is an arch independent SLIP netif. The specific serial hooks must be
segundo 0:ac1725ba162c 42 * provided by another file. They are sio_open, sio_read/sio_tryread and sio_send
segundo 0:ac1725ba162c 43 */
segundo 0:ac1725ba162c 44
segundo 0:ac1725ba162c 45 #include "netif/slipif.h"
segundo 0:ac1725ba162c 46 #include "lwip/opt.h"
segundo 0:ac1725ba162c 47
segundo 0:ac1725ba162c 48 #if LWIP_HAVE_SLIPIF
segundo 0:ac1725ba162c 49
segundo 0:ac1725ba162c 50 #include "lwip/def.h"
segundo 0:ac1725ba162c 51 #include "lwip/pbuf.h"
segundo 0:ac1725ba162c 52 #include "lwip/sys.h"
segundo 0:ac1725ba162c 53 #include "lwip/stats.h"
segundo 0:ac1725ba162c 54 #include "lwip/snmp.h"
segundo 0:ac1725ba162c 55 #include "lwip/sio.h"
segundo 0:ac1725ba162c 56
segundo 0:ac1725ba162c 57 #define SLIP_BLOCK 1
segundo 0:ac1725ba162c 58 #define SLIP_DONTBLOCK 0
segundo 0:ac1725ba162c 59
segundo 0:ac1725ba162c 60 #define SLIP_END 0300 /* 0xC0 */
segundo 0:ac1725ba162c 61 #define SLIP_ESC 0333 /* 0xDB */
segundo 0:ac1725ba162c 62 #define SLIP_ESC_END 0334 /* 0xDC */
segundo 0:ac1725ba162c 63 #define SLIP_ESC_ESC 0335 /* 0xDD */
segundo 0:ac1725ba162c 64
segundo 0:ac1725ba162c 65 #define SLIP_MAX_SIZE 1500
segundo 0:ac1725ba162c 66
segundo 0:ac1725ba162c 67 enum slipif_recv_state {
segundo 0:ac1725ba162c 68 SLIP_RECV_NORMAL,
segundo 0:ac1725ba162c 69 SLIP_RECV_ESCAPE,
segundo 0:ac1725ba162c 70 };
segundo 0:ac1725ba162c 71
segundo 0:ac1725ba162c 72 struct slipif_priv {
segundo 0:ac1725ba162c 73 sio_fd_t sd;
segundo 0:ac1725ba162c 74 /* q is the whole pbuf chain for a packet, p is the current pbuf in the chain */
segundo 0:ac1725ba162c 75 struct pbuf *p, *q;
segundo 0:ac1725ba162c 76 enum slipif_recv_state state;
segundo 0:ac1725ba162c 77 u16_t i, recved;
segundo 0:ac1725ba162c 78 };
segundo 0:ac1725ba162c 79
segundo 0:ac1725ba162c 80 /**
segundo 0:ac1725ba162c 81 * Send a pbuf doing the necessary SLIP encapsulation
segundo 0:ac1725ba162c 82 *
segundo 0:ac1725ba162c 83 * Uses the serial layer's sio_send()
segundo 0:ac1725ba162c 84 *
segundo 0:ac1725ba162c 85 * @param netif the lwip network interface structure for this slipif
segundo 0:ac1725ba162c 86 * @param p the pbuf chaing packet to send
segundo 0:ac1725ba162c 87 * @param ipaddr the ip address to send the packet to (not used for slipif)
segundo 0:ac1725ba162c 88 * @return always returns ERR_OK since the serial layer does not provide return values
segundo 0:ac1725ba162c 89 */
segundo 0:ac1725ba162c 90 err_t
segundo 0:ac1725ba162c 91 slipif_output(struct netif *netif, struct pbuf *p, ip_addr_t *ipaddr)
segundo 0:ac1725ba162c 92 {
segundo 0:ac1725ba162c 93 struct slipif_priv *priv;
segundo 0:ac1725ba162c 94 struct pbuf *q;
segundo 0:ac1725ba162c 95 u16_t i;
segundo 0:ac1725ba162c 96 u8_t c;
segundo 0:ac1725ba162c 97
segundo 0:ac1725ba162c 98 LWIP_ASSERT("netif != NULL", (netif != NULL));
segundo 0:ac1725ba162c 99 LWIP_ASSERT("netif->state != NULL", (netif->state != NULL));
segundo 0:ac1725ba162c 100 LWIP_ASSERT("p != NULL", (p != NULL));
segundo 0:ac1725ba162c 101
segundo 0:ac1725ba162c 102 LWIP_UNUSED_ARG(ipaddr);
segundo 0:ac1725ba162c 103
segundo 0:ac1725ba162c 104 priv = netif->state;
segundo 0:ac1725ba162c 105
segundo 0:ac1725ba162c 106 /* Send pbuf out on the serial I/O device. */
segundo 0:ac1725ba162c 107 sio_send(SLIP_END, priv->sd);
segundo 0:ac1725ba162c 108
segundo 0:ac1725ba162c 109 for (q = p; q != NULL; q = q->next) {
segundo 0:ac1725ba162c 110 for (i = 0; i < q->len; i++) {
segundo 0:ac1725ba162c 111 c = ((u8_t *)q->payload)[i];
segundo 0:ac1725ba162c 112 switch (c) {
segundo 0:ac1725ba162c 113 case SLIP_END:
segundo 0:ac1725ba162c 114 sio_send(SLIP_ESC, priv->sd);
segundo 0:ac1725ba162c 115 sio_send(SLIP_ESC_END, priv->sd);
segundo 0:ac1725ba162c 116 break;
segundo 0:ac1725ba162c 117 case SLIP_ESC:
segundo 0:ac1725ba162c 118 sio_send(SLIP_ESC, priv->sd);
segundo 0:ac1725ba162c 119 sio_send(SLIP_ESC_ESC, priv->sd);
segundo 0:ac1725ba162c 120 break;
segundo 0:ac1725ba162c 121 default:
segundo 0:ac1725ba162c 122 sio_send(c, priv->sd);
segundo 0:ac1725ba162c 123 break;
segundo 0:ac1725ba162c 124 }
segundo 0:ac1725ba162c 125 }
segundo 0:ac1725ba162c 126 }
segundo 0:ac1725ba162c 127 sio_send(SLIP_END, priv->sd);
segundo 0:ac1725ba162c 128 return ERR_OK;
segundo 0:ac1725ba162c 129 }
segundo 0:ac1725ba162c 130
segundo 0:ac1725ba162c 131 /**
segundo 0:ac1725ba162c 132 * Static function for easy use of blockig or non-blocking
segundo 0:ac1725ba162c 133 * sio_read
segundo 0:ac1725ba162c 134 *
segundo 0:ac1725ba162c 135 * @param fd serial device handle
segundo 0:ac1725ba162c 136 * @param data pointer to data buffer for receiving
segundo 0:ac1725ba162c 137 * @param len maximum length (in bytes) of data to receive
segundo 0:ac1725ba162c 138 * @param block if 1, call sio_read; if 0, call sio_tryread
segundo 0:ac1725ba162c 139 * @return return value of sio_read of sio_tryread
segundo 0:ac1725ba162c 140 */
segundo 0:ac1725ba162c 141 static u32_t
segundo 0:ac1725ba162c 142 slip_sio_read(sio_fd_t fd, u8_t* data, u32_t len, u8_t block)
segundo 0:ac1725ba162c 143 {
segundo 0:ac1725ba162c 144 if (block) {
segundo 0:ac1725ba162c 145 return sio_read(fd, data, len);
segundo 0:ac1725ba162c 146 } else {
segundo 0:ac1725ba162c 147 return sio_tryread(fd, data, len);
segundo 0:ac1725ba162c 148 }
segundo 0:ac1725ba162c 149 }
segundo 0:ac1725ba162c 150
segundo 0:ac1725ba162c 151 /**
segundo 0:ac1725ba162c 152 * Handle the incoming SLIP stream character by character
segundo 0:ac1725ba162c 153 *
segundo 0:ac1725ba162c 154 * Poll the serial layer by calling sio_read() or sio_tryread().
segundo 0:ac1725ba162c 155 *
segundo 0:ac1725ba162c 156 * @param netif the lwip network interface structure for this slipif
segundo 0:ac1725ba162c 157 * @param block if 1, block until data is received; if 0, return when all data
segundo 0:ac1725ba162c 158 * from the buffer is received (multiple calls to this function will
segundo 0:ac1725ba162c 159 * return a complete packet, NULL is returned before - used for polling)
segundo 0:ac1725ba162c 160 * @return The IP packet when SLIP_END is received
segundo 0:ac1725ba162c 161 */
segundo 0:ac1725ba162c 162 static struct pbuf *
segundo 0:ac1725ba162c 163 slipif_input(struct netif *netif, u8_t block)
segundo 0:ac1725ba162c 164 {
segundo 0:ac1725ba162c 165 struct slipif_priv *priv;
segundo 0:ac1725ba162c 166 u8_t c;
segundo 0:ac1725ba162c 167 struct pbuf *t;
segundo 0:ac1725ba162c 168
segundo 0:ac1725ba162c 169 LWIP_ASSERT("netif != NULL", (netif != NULL));
segundo 0:ac1725ba162c 170 LWIP_ASSERT("netif->state != NULL", (netif->state != NULL));
segundo 0:ac1725ba162c 171
segundo 0:ac1725ba162c 172 priv = netif->state;
segundo 0:ac1725ba162c 173
segundo 0:ac1725ba162c 174 while (slip_sio_read(priv->sd, &c, 1, block) > 0) {
segundo 0:ac1725ba162c 175 switch (priv->state) {
segundo 0:ac1725ba162c 176 case SLIP_RECV_NORMAL:
segundo 0:ac1725ba162c 177 switch (c) {
segundo 0:ac1725ba162c 178 case SLIP_END:
segundo 0:ac1725ba162c 179 if (priv->recved > 0) {
segundo 0:ac1725ba162c 180 /* Received whole packet. */
segundo 0:ac1725ba162c 181 /* Trim the pbuf to the size of the received packet. */
segundo 0:ac1725ba162c 182 pbuf_realloc(priv->q, priv->recved);
segundo 0:ac1725ba162c 183
segundo 0:ac1725ba162c 184 LINK_STATS_INC(link.recv);
segundo 0:ac1725ba162c 185
segundo 0:ac1725ba162c 186 LWIP_DEBUGF(SLIP_DEBUG, ("slipif: Got packet\n"));
segundo 0:ac1725ba162c 187 t = priv->q;
segundo 0:ac1725ba162c 188 priv->p = priv->q = NULL;
segundo 0:ac1725ba162c 189 priv->i = priv->recved = 0;
segundo 0:ac1725ba162c 190 return t;
segundo 0:ac1725ba162c 191 }
segundo 0:ac1725ba162c 192 continue;
segundo 0:ac1725ba162c 193 case SLIP_ESC:
segundo 0:ac1725ba162c 194 priv->state = SLIP_RECV_ESCAPE;
segundo 0:ac1725ba162c 195 continue;
segundo 0:ac1725ba162c 196 }
segundo 0:ac1725ba162c 197 break;
segundo 0:ac1725ba162c 198 case SLIP_RECV_ESCAPE:
segundo 0:ac1725ba162c 199 switch (c) {
segundo 0:ac1725ba162c 200 case SLIP_ESC_END:
segundo 0:ac1725ba162c 201 c = SLIP_END;
segundo 0:ac1725ba162c 202 break;
segundo 0:ac1725ba162c 203 case SLIP_ESC_ESC:
segundo 0:ac1725ba162c 204 c = SLIP_ESC;
segundo 0:ac1725ba162c 205 break;
segundo 0:ac1725ba162c 206 }
segundo 0:ac1725ba162c 207 priv->state = SLIP_RECV_NORMAL;
segundo 0:ac1725ba162c 208 /* FALLTHROUGH */
segundo 0:ac1725ba162c 209 }
segundo 0:ac1725ba162c 210
segundo 0:ac1725ba162c 211 /* byte received, packet not yet completely received */
segundo 0:ac1725ba162c 212 if (priv->p == NULL) {
segundo 0:ac1725ba162c 213 /* allocate a new pbuf */
segundo 0:ac1725ba162c 214 LWIP_DEBUGF(SLIP_DEBUG, ("slipif_input: alloc\n"));
segundo 0:ac1725ba162c 215 priv->p = pbuf_alloc(PBUF_LINK, (PBUF_POOL_BUFSIZE - PBUF_LINK_HLEN), PBUF_POOL);
segundo 0:ac1725ba162c 216
segundo 0:ac1725ba162c 217 if (priv->p == NULL) {
segundo 0:ac1725ba162c 218 LINK_STATS_INC(link.drop);
segundo 0:ac1725ba162c 219 LWIP_DEBUGF(SLIP_DEBUG, ("slipif_input: no new pbuf! (DROP)\n"));
segundo 0:ac1725ba162c 220 /* don't process any further since we got no pbuf to receive to */
segundo 0:ac1725ba162c 221 break;
segundo 0:ac1725ba162c 222 }
segundo 0:ac1725ba162c 223
segundo 0:ac1725ba162c 224 if (priv->q != NULL) {
segundo 0:ac1725ba162c 225 /* 'chain' the pbuf to the existing chain */
segundo 0:ac1725ba162c 226 pbuf_cat(priv->q, priv->p);
segundo 0:ac1725ba162c 227 } else {
segundo 0:ac1725ba162c 228 /* p is the first pbuf in the chain */
segundo 0:ac1725ba162c 229 priv->q = priv->p;
segundo 0:ac1725ba162c 230 }
segundo 0:ac1725ba162c 231 }
segundo 0:ac1725ba162c 232
segundo 0:ac1725ba162c 233 /* this automatically drops bytes if > SLIP_MAX_SIZE */
segundo 0:ac1725ba162c 234 if ((priv->p != NULL) && (priv->recved <= SLIP_MAX_SIZE)) {
segundo 0:ac1725ba162c 235 ((u8_t *)priv->p->payload)[priv->i] = c;
segundo 0:ac1725ba162c 236 priv->recved++;
segundo 0:ac1725ba162c 237 priv->i++;
segundo 0:ac1725ba162c 238 if (priv->i >= priv->p->len) {
segundo 0:ac1725ba162c 239 /* on to the next pbuf */
segundo 0:ac1725ba162c 240 priv->i = 0;
segundo 0:ac1725ba162c 241 if (priv->p->next != NULL && priv->p->next->len > 0) {
segundo 0:ac1725ba162c 242 /* p is a chain, on to the next in the chain */
segundo 0:ac1725ba162c 243 priv->p = priv->p->next;
segundo 0:ac1725ba162c 244 } else {
segundo 0:ac1725ba162c 245 /* p is a single pbuf, set it to NULL so next time a new
segundo 0:ac1725ba162c 246 * pbuf is allocated */
segundo 0:ac1725ba162c 247 priv->p = NULL;
segundo 0:ac1725ba162c 248 }
segundo 0:ac1725ba162c 249 }
segundo 0:ac1725ba162c 250 }
segundo 0:ac1725ba162c 251 }
segundo 0:ac1725ba162c 252
segundo 0:ac1725ba162c 253 return NULL;
segundo 0:ac1725ba162c 254 }
segundo 0:ac1725ba162c 255
segundo 0:ac1725ba162c 256 #if !NO_SYS
segundo 0:ac1725ba162c 257 /**
segundo 0:ac1725ba162c 258 * The SLIP input thread.
segundo 0:ac1725ba162c 259 *
segundo 0:ac1725ba162c 260 * Feed the IP layer with incoming packets
segundo 0:ac1725ba162c 261 *
segundo 0:ac1725ba162c 262 * @param nf the lwip network interface structure for this slipif
segundo 0:ac1725ba162c 263 */
segundo 0:ac1725ba162c 264 static void
segundo 0:ac1725ba162c 265 slipif_loop_thread(void *nf)
segundo 0:ac1725ba162c 266 {
segundo 0:ac1725ba162c 267 struct pbuf *p;
segundo 0:ac1725ba162c 268 struct netif *netif = (struct netif *)nf;
segundo 0:ac1725ba162c 269
segundo 0:ac1725ba162c 270 while (1) {
segundo 0:ac1725ba162c 271 p = slipif_input(netif, SLIP_BLOCK);
segundo 0:ac1725ba162c 272 if (p != NULL) {
segundo 0:ac1725ba162c 273 if (netif->input(p, netif) != ERR_OK) {
segundo 0:ac1725ba162c 274 pbuf_free(p);
segundo 0:ac1725ba162c 275 p = NULL;
segundo 0:ac1725ba162c 276 }
segundo 0:ac1725ba162c 277 }
segundo 0:ac1725ba162c 278 }
segundo 0:ac1725ba162c 279 }
segundo 0:ac1725ba162c 280 #endif /* !NO_SYS */
segundo 0:ac1725ba162c 281
segundo 0:ac1725ba162c 282 /**
segundo 0:ac1725ba162c 283 * SLIP netif initialization
segundo 0:ac1725ba162c 284 *
segundo 0:ac1725ba162c 285 * Call the arch specific sio_open and remember
segundo 0:ac1725ba162c 286 * the opened device in the state field of the netif.
segundo 0:ac1725ba162c 287 *
segundo 0:ac1725ba162c 288 * @param netif the lwip network interface structure for this slipif
segundo 0:ac1725ba162c 289 * @return ERR_OK if serial line could be opened,
segundo 0:ac1725ba162c 290 * ERR_MEM if no memory could be allocated,
segundo 0:ac1725ba162c 291 * ERR_IF is serial line couldn't be opened
segundo 0:ac1725ba162c 292 *
segundo 0:ac1725ba162c 293 * @note netif->num must contain the number of the serial port to open
segundo 0:ac1725ba162c 294 * (0 by default)
segundo 0:ac1725ba162c 295 */
segundo 0:ac1725ba162c 296 err_t
segundo 0:ac1725ba162c 297 slipif_init(struct netif *netif)
segundo 0:ac1725ba162c 298 {
segundo 0:ac1725ba162c 299 struct slipif_priv *priv;
segundo 0:ac1725ba162c 300
segundo 0:ac1725ba162c 301 LWIP_DEBUGF(SLIP_DEBUG, ("slipif_init: netif->num=%"U16_F"\n", (u16_t)netif->num));
segundo 0:ac1725ba162c 302
segundo 0:ac1725ba162c 303 /* Allocate private data */
segundo 0:ac1725ba162c 304 priv = mem_malloc(sizeof(struct slipif_priv));
segundo 0:ac1725ba162c 305 if (!priv) {
segundo 0:ac1725ba162c 306 return ERR_MEM;
segundo 0:ac1725ba162c 307 }
segundo 0:ac1725ba162c 308
segundo 0:ac1725ba162c 309 netif->name[0] = 's';
segundo 0:ac1725ba162c 310 netif->name[1] = 'l';
segundo 0:ac1725ba162c 311 netif->output = slipif_output;
segundo 0:ac1725ba162c 312 netif->mtu = SLIP_MAX_SIZE;
segundo 0:ac1725ba162c 313 netif->flags |= NETIF_FLAG_POINTTOPOINT;
segundo 0:ac1725ba162c 314
segundo 0:ac1725ba162c 315 /* Try to open the serial port (netif->num contains the port number). */
segundo 0:ac1725ba162c 316 priv->sd = sio_open(netif->num);
segundo 0:ac1725ba162c 317 if (!priv->sd) {
segundo 0:ac1725ba162c 318 /* Opening the serial port failed. */
segundo 0:ac1725ba162c 319 mem_free(priv);
segundo 0:ac1725ba162c 320 return ERR_IF;
segundo 0:ac1725ba162c 321 }
segundo 0:ac1725ba162c 322
segundo 0:ac1725ba162c 323 /* Initialize private data */
segundo 0:ac1725ba162c 324 priv->p = NULL;
segundo 0:ac1725ba162c 325 priv->q = NULL;
segundo 0:ac1725ba162c 326 priv->state = SLIP_RECV_NORMAL;
segundo 0:ac1725ba162c 327 priv->i = 0;
segundo 0:ac1725ba162c 328 priv->recved = 0;
segundo 0:ac1725ba162c 329
segundo 0:ac1725ba162c 330 netif->state = priv;
segundo 0:ac1725ba162c 331
segundo 0:ac1725ba162c 332 /* initialize the snmp variables and counters inside the struct netif
segundo 0:ac1725ba162c 333 * ifSpeed: no assumption can be made without knowing more about the
segundo 0:ac1725ba162c 334 * serial line!
segundo 0:ac1725ba162c 335 */
segundo 0:ac1725ba162c 336 NETIF_INIT_SNMP(netif, snmp_ifType_slip, 0);
segundo 0:ac1725ba162c 337
segundo 0:ac1725ba162c 338 /* Create a thread to poll the serial line. */
segundo 0:ac1725ba162c 339 sys_thread_new(SLIPIF_THREAD_NAME, slipif_loop_thread, netif,
segundo 0:ac1725ba162c 340 SLIPIF_THREAD_STACKSIZE, SLIPIF_THREAD_PRIO);
segundo 0:ac1725ba162c 341 return ERR_OK;
segundo 0:ac1725ba162c 342 }
segundo 0:ac1725ba162c 343
segundo 0:ac1725ba162c 344 /**
segundo 0:ac1725ba162c 345 * Polls the serial device and feeds the IP layer with incoming packets.
segundo 0:ac1725ba162c 346 *
segundo 0:ac1725ba162c 347 * @param netif The lwip network interface structure for this slipif
segundo 0:ac1725ba162c 348 */
segundo 0:ac1725ba162c 349 void
segundo 0:ac1725ba162c 350 slipif_poll(struct netif *netif)
segundo 0:ac1725ba162c 351 {
segundo 0:ac1725ba162c 352 struct pbuf *p;
segundo 0:ac1725ba162c 353 struct slipif_priv *priv;
segundo 0:ac1725ba162c 354
segundo 0:ac1725ba162c 355 LWIP_ASSERT("netif != NULL", (netif != NULL));
segundo 0:ac1725ba162c 356 LWIP_ASSERT("netif->state != NULL", (netif->state != NULL));
segundo 0:ac1725ba162c 357
segundo 0:ac1725ba162c 358 priv = netif->state;
segundo 0:ac1725ba162c 359
segundo 0:ac1725ba162c 360 while ((p = slipif_input(netif, SLIP_DONTBLOCK)) != NULL) {
segundo 0:ac1725ba162c 361 if (netif->input(p, netif) != ERR_OK) {
segundo 0:ac1725ba162c 362 pbuf_free(p);
segundo 0:ac1725ba162c 363 }
segundo 0:ac1725ba162c 364 }
segundo 0:ac1725ba162c 365 }
segundo 0:ac1725ba162c 366
segundo 0:ac1725ba162c 367 #endif /* LWIP_HAVE_SLIPIF */