Ankit Patel / Mbed 2 deprecated Robot_Control_UDP_Ethernet

Control a robot over the internet using UDP and a Ethernet interface.

Dependencies:   EthernetInterface Motor TextLCD mbed-rtos mbed Socket lwip-eth lwip-sys lwip

EthernetInterface/lwip/netif/slipif.c@0:1496281373a5, 2013-10-17 (annotated)

Committer:
apatel336
Date:
Thu Oct 17 13:26:38 2013 +0000
Revision:
0:1496281373a5
Initial Release

Who changed what in which revision?

UserRevisionLine numberNew contents of line
apatel336 0:1496281373a5 1 /**
apatel336 0:1496281373a5 2 * @file
apatel336 0:1496281373a5 3 * SLIP Interface
apatel336 0:1496281373a5 4 *
apatel336 0:1496281373a5 5 */
apatel336 0:1496281373a5 6
apatel336 0:1496281373a5 7 /*
apatel336 0:1496281373a5 8 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
apatel336 0:1496281373a5 9 * All rights reserved.
apatel336 0:1496281373a5 10 *
apatel336 0:1496281373a5 11 * Redistribution and use in source and binary forms, with or without
apatel336 0:1496281373a5 12 * modification, are permitted provided that the following conditions
apatel336 0:1496281373a5 13 * are met:
apatel336 0:1496281373a5 14 * 1. Redistributions of source code must retain the above copyright
apatel336 0:1496281373a5 15 * notice, this list of conditions and the following disclaimer.
apatel336 0:1496281373a5 16 * 2. Redistributions in binary form must reproduce the above copyright
apatel336 0:1496281373a5 17 * notice, this list of conditions and the following disclaimer in the
apatel336 0:1496281373a5 18 * documentation and/or other materials provided with the distribution.
apatel336 0:1496281373a5 19 * 3. Neither the name of the Institute nor the names of its contributors
apatel336 0:1496281373a5 20 * may be used to endorse or promote products derived from this software
apatel336 0:1496281373a5 21 * without specific prior written permission.
apatel336 0:1496281373a5 22 *
apatel336 0:1496281373a5 23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
apatel336 0:1496281373a5 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
apatel336 0:1496281373a5 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
apatel336 0:1496281373a5 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
apatel336 0:1496281373a5 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
apatel336 0:1496281373a5 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
apatel336 0:1496281373a5 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
apatel336 0:1496281373a5 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
apatel336 0:1496281373a5 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
apatel336 0:1496281373a5 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
apatel336 0:1496281373a5 33 * SUCH DAMAGE.
apatel336 0:1496281373a5 34 *
apatel336 0:1496281373a5 35 * This file is built upon the file: src/arch/rtxc/netif/sioslip.c
apatel336 0:1496281373a5 36 *
apatel336 0:1496281373a5 37 * Author: Magnus Ivarsson <magnus.ivarsson(at)volvo.com>
apatel336 0:1496281373a5 38 */
apatel336 0:1496281373a5 39
apatel336 0:1496281373a5 40 /*
apatel336 0:1496281373a5 41 * This is an arch independent SLIP netif. The specific serial hooks must be
apatel336 0:1496281373a5 42 * provided by another file. They are sio_open, sio_read/sio_tryread and sio_send
apatel336 0:1496281373a5 43 */
apatel336 0:1496281373a5 44
apatel336 0:1496281373a5 45 #include "netif/slipif.h"
apatel336 0:1496281373a5 46 #include "lwip/opt.h"
apatel336 0:1496281373a5 47
apatel336 0:1496281373a5 48 #if LWIP_HAVE_SLIPIF
apatel336 0:1496281373a5 49
apatel336 0:1496281373a5 50 #include "lwip/def.h"
apatel336 0:1496281373a5 51 #include "lwip/pbuf.h"
apatel336 0:1496281373a5 52 #include "lwip/sys.h"
apatel336 0:1496281373a5 53 #include "lwip/stats.h"
apatel336 0:1496281373a5 54 #include "lwip/snmp.h"
apatel336 0:1496281373a5 55 #include "lwip/sio.h"
apatel336 0:1496281373a5 56
apatel336 0:1496281373a5 57 #define SLIP_BLOCK 1
apatel336 0:1496281373a5 58 #define SLIP_DONTBLOCK 0
apatel336 0:1496281373a5 59
apatel336 0:1496281373a5 60 #define SLIP_END 0300 /* 0xC0 */
apatel336 0:1496281373a5 61 #define SLIP_ESC 0333 /* 0xDB */
apatel336 0:1496281373a5 62 #define SLIP_ESC_END 0334 /* 0xDC */
apatel336 0:1496281373a5 63 #define SLIP_ESC_ESC 0335 /* 0xDD */
apatel336 0:1496281373a5 64
apatel336 0:1496281373a5 65 #define SLIP_MAX_SIZE 1500
apatel336 0:1496281373a5 66
apatel336 0:1496281373a5 67 enum slipif_recv_state {
apatel336 0:1496281373a5 68 SLIP_RECV_NORMAL,
apatel336 0:1496281373a5 69 SLIP_RECV_ESCAPE,
apatel336 0:1496281373a5 70 };
apatel336 0:1496281373a5 71
apatel336 0:1496281373a5 72 struct slipif_priv {
apatel336 0:1496281373a5 73 sio_fd_t sd;
apatel336 0:1496281373a5 74 /* q is the whole pbuf chain for a packet, p is the current pbuf in the chain */
apatel336 0:1496281373a5 75 struct pbuf *p, *q;
apatel336 0:1496281373a5 76 enum slipif_recv_state state;
apatel336 0:1496281373a5 77 u16_t i, recved;
apatel336 0:1496281373a5 78 };
apatel336 0:1496281373a5 79
apatel336 0:1496281373a5 80 /**
apatel336 0:1496281373a5 81 * Send a pbuf doing the necessary SLIP encapsulation
apatel336 0:1496281373a5 82 *
apatel336 0:1496281373a5 83 * Uses the serial layer's sio_send()
apatel336 0:1496281373a5 84 *
apatel336 0:1496281373a5 85 * @param netif the lwip network interface structure for this slipif
apatel336 0:1496281373a5 86 * @param p the pbuf chaing packet to send
apatel336 0:1496281373a5 87 * @param ipaddr the ip address to send the packet to (not used for slipif)
apatel336 0:1496281373a5 88 * @return always returns ERR_OK since the serial layer does not provide return values
apatel336 0:1496281373a5 89 */
apatel336 0:1496281373a5 90 err_t
apatel336 0:1496281373a5 91 slipif_output(struct netif *netif, struct pbuf *p, ip_addr_t *ipaddr)
apatel336 0:1496281373a5 92 {
apatel336 0:1496281373a5 93 struct slipif_priv *priv;
apatel336 0:1496281373a5 94 struct pbuf *q;
apatel336 0:1496281373a5 95 u16_t i;
apatel336 0:1496281373a5 96 u8_t c;
apatel336 0:1496281373a5 97
apatel336 0:1496281373a5 98 LWIP_ASSERT("netif != NULL", (netif != NULL));
apatel336 0:1496281373a5 99 LWIP_ASSERT("netif->state != NULL", (netif->state != NULL));
apatel336 0:1496281373a5 100 LWIP_ASSERT("p != NULL", (p != NULL));
apatel336 0:1496281373a5 101
apatel336 0:1496281373a5 102 LWIP_UNUSED_ARG(ipaddr);
apatel336 0:1496281373a5 103
apatel336 0:1496281373a5 104 priv = netif->state;
apatel336 0:1496281373a5 105
apatel336 0:1496281373a5 106 /* Send pbuf out on the serial I/O device. */
apatel336 0:1496281373a5 107 sio_send(SLIP_END, priv->sd);
apatel336 0:1496281373a5 108
apatel336 0:1496281373a5 109 for (q = p; q != NULL; q = q->next) {
apatel336 0:1496281373a5 110 for (i = 0; i < q->len; i++) {
apatel336 0:1496281373a5 111 c = ((u8_t *)q->payload)[i];
apatel336 0:1496281373a5 112 switch (c) {
apatel336 0:1496281373a5 113 case SLIP_END:
apatel336 0:1496281373a5 114 sio_send(SLIP_ESC, priv->sd);
apatel336 0:1496281373a5 115 sio_send(SLIP_ESC_END, priv->sd);
apatel336 0:1496281373a5 116 break;
apatel336 0:1496281373a5 117 case SLIP_ESC:
apatel336 0:1496281373a5 118 sio_send(SLIP_ESC, priv->sd);
apatel336 0:1496281373a5 119 sio_send(SLIP_ESC_ESC, priv->sd);
apatel336 0:1496281373a5 120 break;
apatel336 0:1496281373a5 121 default:
apatel336 0:1496281373a5 122 sio_send(c, priv->sd);
apatel336 0:1496281373a5 123 break;
apatel336 0:1496281373a5 124 }
apatel336 0:1496281373a5 125 }
apatel336 0:1496281373a5 126 }
apatel336 0:1496281373a5 127 sio_send(SLIP_END, priv->sd);
apatel336 0:1496281373a5 128 return ERR_OK;
apatel336 0:1496281373a5 129 }
apatel336 0:1496281373a5 130
apatel336 0:1496281373a5 131 /**
apatel336 0:1496281373a5 132 * Static function for easy use of blockig or non-blocking
apatel336 0:1496281373a5 133 * sio_read
apatel336 0:1496281373a5 134 *
apatel336 0:1496281373a5 135 * @param fd serial device handle
apatel336 0:1496281373a5 136 * @param data pointer to data buffer for receiving
apatel336 0:1496281373a5 137 * @param len maximum length (in bytes) of data to receive
apatel336 0:1496281373a5 138 * @param block if 1, call sio_read; if 0, call sio_tryread
apatel336 0:1496281373a5 139 * @return return value of sio_read of sio_tryread
apatel336 0:1496281373a5 140 */
apatel336 0:1496281373a5 141 static u32_t
apatel336 0:1496281373a5 142 slip_sio_read(sio_fd_t fd, u8_t* data, u32_t len, u8_t block)
apatel336 0:1496281373a5 143 {
apatel336 0:1496281373a5 144 if (block) {
apatel336 0:1496281373a5 145 return sio_read(fd, data, len);
apatel336 0:1496281373a5 146 } else {
apatel336 0:1496281373a5 147 return sio_tryread(fd, data, len);
apatel336 0:1496281373a5 148 }
apatel336 0:1496281373a5 149 }
apatel336 0:1496281373a5 150
apatel336 0:1496281373a5 151 /**
apatel336 0:1496281373a5 152 * Handle the incoming SLIP stream character by character
apatel336 0:1496281373a5 153 *
apatel336 0:1496281373a5 154 * Poll the serial layer by calling sio_read() or sio_tryread().
apatel336 0:1496281373a5 155 *
apatel336 0:1496281373a5 156 * @param netif the lwip network interface structure for this slipif
apatel336 0:1496281373a5 157 * @param block if 1, block until data is received; if 0, return when all data
apatel336 0:1496281373a5 158 * from the buffer is received (multiple calls to this function will
apatel336 0:1496281373a5 159 * return a complete packet, NULL is returned before - used for polling)
apatel336 0:1496281373a5 160 * @return The IP packet when SLIP_END is received
apatel336 0:1496281373a5 161 */
apatel336 0:1496281373a5 162 static struct pbuf *
apatel336 0:1496281373a5 163 slipif_input(struct netif *netif, u8_t block)
apatel336 0:1496281373a5 164 {
apatel336 0:1496281373a5 165 struct slipif_priv *priv;
apatel336 0:1496281373a5 166 u8_t c;
apatel336 0:1496281373a5 167 struct pbuf *t;
apatel336 0:1496281373a5 168
apatel336 0:1496281373a5 169 LWIP_ASSERT("netif != NULL", (netif != NULL));
apatel336 0:1496281373a5 170 LWIP_ASSERT("netif->state != NULL", (netif->state != NULL));
apatel336 0:1496281373a5 171
apatel336 0:1496281373a5 172 priv = netif->state;
apatel336 0:1496281373a5 173
apatel336 0:1496281373a5 174 while (slip_sio_read(priv->sd, &c, 1, block) > 0) {
apatel336 0:1496281373a5 175 switch (priv->state) {
apatel336 0:1496281373a5 176 case SLIP_RECV_NORMAL:
apatel336 0:1496281373a5 177 switch (c) {
apatel336 0:1496281373a5 178 case SLIP_END:
apatel336 0:1496281373a5 179 if (priv->recved > 0) {
apatel336 0:1496281373a5 180 /* Received whole packet. */
apatel336 0:1496281373a5 181 /* Trim the pbuf to the size of the received packet. */
apatel336 0:1496281373a5 182 pbuf_realloc(priv->q, priv->recved);
apatel336 0:1496281373a5 183
apatel336 0:1496281373a5 184 LINK_STATS_INC(link.recv);
apatel336 0:1496281373a5 185
apatel336 0:1496281373a5 186 LWIP_DEBUGF(SLIP_DEBUG, ("slipif: Got packet\n"));
apatel336 0:1496281373a5 187 t = priv->q;
apatel336 0:1496281373a5 188 priv->p = priv->q = NULL;
apatel336 0:1496281373a5 189 priv->i = priv->recved = 0;
apatel336 0:1496281373a5 190 return t;
apatel336 0:1496281373a5 191 }
apatel336 0:1496281373a5 192 continue;
apatel336 0:1496281373a5 193 case SLIP_ESC:
apatel336 0:1496281373a5 194 priv->state = SLIP_RECV_ESCAPE;
apatel336 0:1496281373a5 195 continue;
apatel336 0:1496281373a5 196 }
apatel336 0:1496281373a5 197 break;
apatel336 0:1496281373a5 198 case SLIP_RECV_ESCAPE:
apatel336 0:1496281373a5 199 switch (c) {
apatel336 0:1496281373a5 200 case SLIP_ESC_END:
apatel336 0:1496281373a5 201 c = SLIP_END;
apatel336 0:1496281373a5 202 break;
apatel336 0:1496281373a5 203 case SLIP_ESC_ESC:
apatel336 0:1496281373a5 204 c = SLIP_ESC;
apatel336 0:1496281373a5 205 break;
apatel336 0:1496281373a5 206 }
apatel336 0:1496281373a5 207 priv->state = SLIP_RECV_NORMAL;
apatel336 0:1496281373a5 208 /* FALLTHROUGH */
apatel336 0:1496281373a5 209 }
apatel336 0:1496281373a5 210
apatel336 0:1496281373a5 211 /* byte received, packet not yet completely received */
apatel336 0:1496281373a5 212 if (priv->p == NULL) {
apatel336 0:1496281373a5 213 /* allocate a new pbuf */
apatel336 0:1496281373a5 214 LWIP_DEBUGF(SLIP_DEBUG, ("slipif_input: alloc\n"));
apatel336 0:1496281373a5 215 priv->p = pbuf_alloc(PBUF_LINK, (PBUF_POOL_BUFSIZE - PBUF_LINK_HLEN), PBUF_POOL);
apatel336 0:1496281373a5 216
apatel336 0:1496281373a5 217 if (priv->p == NULL) {
apatel336 0:1496281373a5 218 LINK_STATS_INC(link.drop);
apatel336 0:1496281373a5 219 LWIP_DEBUGF(SLIP_DEBUG, ("slipif_input: no new pbuf! (DROP)\n"));
apatel336 0:1496281373a5 220 /* don't process any further since we got no pbuf to receive to */
apatel336 0:1496281373a5 221 break;
apatel336 0:1496281373a5 222 }
apatel336 0:1496281373a5 223
apatel336 0:1496281373a5 224 if (priv->q != NULL) {
apatel336 0:1496281373a5 225 /* 'chain' the pbuf to the existing chain */
apatel336 0:1496281373a5 226 pbuf_cat(priv->q, priv->p);
apatel336 0:1496281373a5 227 } else {
apatel336 0:1496281373a5 228 /* p is the first pbuf in the chain */
apatel336 0:1496281373a5 229 priv->q = priv->p;
apatel336 0:1496281373a5 230 }
apatel336 0:1496281373a5 231 }
apatel336 0:1496281373a5 232
apatel336 0:1496281373a5 233 /* this automatically drops bytes if > SLIP_MAX_SIZE */
apatel336 0:1496281373a5 234 if ((priv->p != NULL) && (priv->recved <= SLIP_MAX_SIZE)) {
apatel336 0:1496281373a5 235 ((u8_t *)priv->p->payload)[priv->i] = c;
apatel336 0:1496281373a5 236 priv->recved++;
apatel336 0:1496281373a5 237 priv->i++;
apatel336 0:1496281373a5 238 if (priv->i >= priv->p->len) {
apatel336 0:1496281373a5 239 /* on to the next pbuf */
apatel336 0:1496281373a5 240 priv->i = 0;
apatel336 0:1496281373a5 241 if (priv->p->next != NULL && priv->p->next->len > 0) {
apatel336 0:1496281373a5 242 /* p is a chain, on to the next in the chain */
apatel336 0:1496281373a5 243 priv->p = priv->p->next;
apatel336 0:1496281373a5 244 } else {
apatel336 0:1496281373a5 245 /* p is a single pbuf, set it to NULL so next time a new
apatel336 0:1496281373a5 246 * pbuf is allocated */
apatel336 0:1496281373a5 247 priv->p = NULL;
apatel336 0:1496281373a5 248 }
apatel336 0:1496281373a5 249 }
apatel336 0:1496281373a5 250 }
apatel336 0:1496281373a5 251 }
apatel336 0:1496281373a5 252
apatel336 0:1496281373a5 253 return NULL;
apatel336 0:1496281373a5 254 }
apatel336 0:1496281373a5 255
apatel336 0:1496281373a5 256 #if !NO_SYS
apatel336 0:1496281373a5 257 /**
apatel336 0:1496281373a5 258 * The SLIP input thread.
apatel336 0:1496281373a5 259 *
apatel336 0:1496281373a5 260 * Feed the IP layer with incoming packets
apatel336 0:1496281373a5 261 *
apatel336 0:1496281373a5 262 * @param nf the lwip network interface structure for this slipif
apatel336 0:1496281373a5 263 */
apatel336 0:1496281373a5 264 static void
apatel336 0:1496281373a5 265 slipif_loop_thread(void *nf)
apatel336 0:1496281373a5 266 {
apatel336 0:1496281373a5 267 struct pbuf *p;
apatel336 0:1496281373a5 268 struct netif *netif = (struct netif *)nf;
apatel336 0:1496281373a5 269
apatel336 0:1496281373a5 270 while (1) {
apatel336 0:1496281373a5 271 p = slipif_input(netif, SLIP_BLOCK);
apatel336 0:1496281373a5 272 if (p != NULL) {
apatel336 0:1496281373a5 273 if (netif->input(p, netif) != ERR_OK) {
apatel336 0:1496281373a5 274 pbuf_free(p);
apatel336 0:1496281373a5 275 p = NULL;
apatel336 0:1496281373a5 276 }
apatel336 0:1496281373a5 277 }
apatel336 0:1496281373a5 278 }
apatel336 0:1496281373a5 279 }
apatel336 0:1496281373a5 280 #endif /* !NO_SYS */
apatel336 0:1496281373a5 281
apatel336 0:1496281373a5 282 /**
apatel336 0:1496281373a5 283 * SLIP netif initialization
apatel336 0:1496281373a5 284 *
apatel336 0:1496281373a5 285 * Call the arch specific sio_open and remember
apatel336 0:1496281373a5 286 * the opened device in the state field of the netif.
apatel336 0:1496281373a5 287 *
apatel336 0:1496281373a5 288 * @param netif the lwip network interface structure for this slipif
apatel336 0:1496281373a5 289 * @return ERR_OK if serial line could be opened,
apatel336 0:1496281373a5 290 * ERR_MEM if no memory could be allocated,
apatel336 0:1496281373a5 291 * ERR_IF is serial line couldn't be opened
apatel336 0:1496281373a5 292 *
apatel336 0:1496281373a5 293 * @note netif->num must contain the number of the serial port to open
apatel336 0:1496281373a5 294 * (0 by default)
apatel336 0:1496281373a5 295 */
apatel336 0:1496281373a5 296 err_t
apatel336 0:1496281373a5 297 slipif_init(struct netif *netif)
apatel336 0:1496281373a5 298 {
apatel336 0:1496281373a5 299 struct slipif_priv *priv;
apatel336 0:1496281373a5 300
apatel336 0:1496281373a5 301 LWIP_DEBUGF(SLIP_DEBUG, ("slipif_init: netif->num=%"U16_F"\n", (u16_t)netif->num));
apatel336 0:1496281373a5 302
apatel336 0:1496281373a5 303 /* Allocate private data */
apatel336 0:1496281373a5 304 priv = mem_malloc(sizeof(struct slipif_priv));
apatel336 0:1496281373a5 305 if (!priv) {
apatel336 0:1496281373a5 306 return ERR_MEM;
apatel336 0:1496281373a5 307 }
apatel336 0:1496281373a5 308
apatel336 0:1496281373a5 309 netif->name[0] = 's';
apatel336 0:1496281373a5 310 netif->name[1] = 'l';
apatel336 0:1496281373a5 311 netif->output = slipif_output;
apatel336 0:1496281373a5 312 netif->mtu = SLIP_MAX_SIZE;
apatel336 0:1496281373a5 313 netif->flags |= NETIF_FLAG_POINTTOPOINT;
apatel336 0:1496281373a5 314
apatel336 0:1496281373a5 315 /* Try to open the serial port (netif->num contains the port number). */
apatel336 0:1496281373a5 316 priv->sd = sio_open(netif->num);
apatel336 0:1496281373a5 317 if (!priv->sd) {
apatel336 0:1496281373a5 318 /* Opening the serial port failed. */
apatel336 0:1496281373a5 319 mem_free(priv);
apatel336 0:1496281373a5 320 return ERR_IF;
apatel336 0:1496281373a5 321 }
apatel336 0:1496281373a5 322
apatel336 0:1496281373a5 323 /* Initialize private data */
apatel336 0:1496281373a5 324 priv->p = NULL;
apatel336 0:1496281373a5 325 priv->q = NULL;
apatel336 0:1496281373a5 326 priv->state = SLIP_RECV_NORMAL;
apatel336 0:1496281373a5 327 priv->i = 0;
apatel336 0:1496281373a5 328 priv->recved = 0;
apatel336 0:1496281373a5 329
apatel336 0:1496281373a5 330 netif->state = priv;
apatel336 0:1496281373a5 331
apatel336 0:1496281373a5 332 /* initialize the snmp variables and counters inside the struct netif
apatel336 0:1496281373a5 333 * ifSpeed: no assumption can be made without knowing more about the
apatel336 0:1496281373a5 334 * serial line!
apatel336 0:1496281373a5 335 */
apatel336 0:1496281373a5 336 NETIF_INIT_SNMP(netif, snmp_ifType_slip, 0);
apatel336 0:1496281373a5 337
apatel336 0:1496281373a5 338 /* Create a thread to poll the serial line. */
apatel336 0:1496281373a5 339 sys_thread_new(SLIPIF_THREAD_NAME, slipif_loop_thread, netif,
apatel336 0:1496281373a5 340 SLIPIF_THREAD_STACKSIZE, SLIPIF_THREAD_PRIO);
apatel336 0:1496281373a5 341 return ERR_OK;
apatel336 0:1496281373a5 342 }
apatel336 0:1496281373a5 343
apatel336 0:1496281373a5 344 /**
apatel336 0:1496281373a5 345 * Polls the serial device and feeds the IP layer with incoming packets.
apatel336 0:1496281373a5 346 *
apatel336 0:1496281373a5 347 * @param netif The lwip network interface structure for this slipif
apatel336 0:1496281373a5 348 */
apatel336 0:1496281373a5 349 void
apatel336 0:1496281373a5 350 slipif_poll(struct netif *netif)
apatel336 0:1496281373a5 351 {
apatel336 0:1496281373a5 352 struct pbuf *p;
apatel336 0:1496281373a5 353 struct slipif_priv *priv;
apatel336 0:1496281373a5 354
apatel336 0:1496281373a5 355 LWIP_ASSERT("netif != NULL", (netif != NULL));
apatel336 0:1496281373a5 356 LWIP_ASSERT("netif->state != NULL", (netif->state != NULL));
apatel336 0:1496281373a5 357
apatel336 0:1496281373a5 358 priv = netif->state;
apatel336 0:1496281373a5 359
apatel336 0:1496281373a5 360 while ((p = slipif_input(netif, SLIP_DONTBLOCK)) != NULL) {
apatel336 0:1496281373a5 361 if (netif->input(p, netif) != ERR_OK) {
apatel336 0:1496281373a5 362 pbuf_free(p);
apatel336 0:1496281373a5 363 }
apatel336 0:1496281373a5 364 }
apatel336 0:1496281373a5 365 }
apatel336 0:1496281373a5 366
apatel336 0:1496281373a5 367 #endif /* LWIP_HAVE_SLIPIF */