Adam Green / Mbed 2 deprecated WeatherStation

Web server based weather station using Sparkfun Weather Meters.

Dependencies:   FatFileSystem mbed WeatherMeters SDFileSystem

NetStack/lwip/netif/slipif.c@1:c7958aa34fa1, 2012-02-25 (annotated)

Committer:
AdamGreen
Date:
Sat Feb 25 03:28:05 2012 +0000
Revision:
1:c7958aa34fa1
Parent:
0:616601bde9fb 
Use published libraries where possible.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
AdamGreen 0:616601bde9fb 1 /**
AdamGreen 0:616601bde9fb 2 * @file
AdamGreen 0:616601bde9fb 3 * SLIP Interface
AdamGreen 0:616601bde9fb 4 *
AdamGreen 0:616601bde9fb 5 */
AdamGreen 0:616601bde9fb 6
AdamGreen 0:616601bde9fb 7 /*
AdamGreen 0:616601bde9fb 8 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
AdamGreen 0:616601bde9fb 9 * All rights reserved.
AdamGreen 0:616601bde9fb 10 *
AdamGreen 0:616601bde9fb 11 * Redistribution and use in source and binary forms, with or without
AdamGreen 0:616601bde9fb 12 * modification, are permitted provided that the following conditions
AdamGreen 0:616601bde9fb 13 * are met:
AdamGreen 0:616601bde9fb 14 * 1. Redistributions of source code must retain the above copyright
AdamGreen 0:616601bde9fb 15 * notice, this list of conditions and the following disclaimer.
AdamGreen 0:616601bde9fb 16 * 2. Redistributions in binary form must reproduce the above copyright
AdamGreen 0:616601bde9fb 17 * notice, this list of conditions and the following disclaimer in the
AdamGreen 0:616601bde9fb 18 * documentation and/or other materials provided with the distribution.
AdamGreen 0:616601bde9fb 19 * 3. Neither the name of the Institute nor the names of its contributors
AdamGreen 0:616601bde9fb 20 * may be used to endorse or promote products derived from this software
AdamGreen 0:616601bde9fb 21 * without specific prior written permission.
AdamGreen 0:616601bde9fb 22 *
AdamGreen 0:616601bde9fb 23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
AdamGreen 0:616601bde9fb 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
AdamGreen 0:616601bde9fb 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
AdamGreen 0:616601bde9fb 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
AdamGreen 0:616601bde9fb 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
AdamGreen 0:616601bde9fb 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
AdamGreen 0:616601bde9fb 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
AdamGreen 0:616601bde9fb 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
AdamGreen 0:616601bde9fb 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
AdamGreen 0:616601bde9fb 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
AdamGreen 0:616601bde9fb 33 * SUCH DAMAGE.
AdamGreen 0:616601bde9fb 34 *
AdamGreen 0:616601bde9fb 35 * This file is built upon the file: src/arch/rtxc/netif/sioslip.c
AdamGreen 0:616601bde9fb 36 *
AdamGreen 0:616601bde9fb 37 * Author: Magnus Ivarsson <magnus.ivarsson(at)volvo.com>
AdamGreen 0:616601bde9fb 38 */
AdamGreen 0:616601bde9fb 39
AdamGreen 0:616601bde9fb 40 /*
AdamGreen 0:616601bde9fb 41 * This is an arch independent SLIP netif. The specific serial hooks must be
AdamGreen 0:616601bde9fb 42 * provided by another file. They are sio_open, sio_read/sio_tryread and sio_send
AdamGreen 0:616601bde9fb 43 */
AdamGreen 0:616601bde9fb 44
AdamGreen 0:616601bde9fb 45 #include "netif/slipif.h"
AdamGreen 0:616601bde9fb 46 #include "lwip/opt.h"
AdamGreen 0:616601bde9fb 47
AdamGreen 0:616601bde9fb 48 #if LWIP_HAVE_SLIPIF
AdamGreen 0:616601bde9fb 49
AdamGreen 0:616601bde9fb 50 #include "lwip/def.h"
AdamGreen 0:616601bde9fb 51 #include "lwip/pbuf.h"
AdamGreen 0:616601bde9fb 52 #include "lwip/sys.h"
AdamGreen 0:616601bde9fb 53 #include "lwip/stats.h"
AdamGreen 0:616601bde9fb 54 #include "lwip/snmp.h"
AdamGreen 0:616601bde9fb 55 #include "lwip/sio.h"
AdamGreen 0:616601bde9fb 56
AdamGreen 0:616601bde9fb 57 #define SLIP_BLOCK 1
AdamGreen 0:616601bde9fb 58 #define SLIP_DONTBLOCK 0
AdamGreen 0:616601bde9fb 59
AdamGreen 0:616601bde9fb 60 #define SLIP_END 0300 /* 0xC0 */
AdamGreen 0:616601bde9fb 61 #define SLIP_ESC 0333 /* 0xDB */
AdamGreen 0:616601bde9fb 62 #define SLIP_ESC_END 0334 /* 0xDC */
AdamGreen 0:616601bde9fb 63 #define SLIP_ESC_ESC 0335 /* 0xDD */
AdamGreen 0:616601bde9fb 64
AdamGreen 0:616601bde9fb 65 #define SLIP_MAX_SIZE 1500
AdamGreen 0:616601bde9fb 66
AdamGreen 0:616601bde9fb 67 enum slipif_recv_state {
AdamGreen 0:616601bde9fb 68 SLIP_RECV_NORMAL,
AdamGreen 0:616601bde9fb 69 SLIP_RECV_ESCAPE,
AdamGreen 0:616601bde9fb 70 };
AdamGreen 0:616601bde9fb 71
AdamGreen 0:616601bde9fb 72 struct slipif_priv {
AdamGreen 0:616601bde9fb 73 sio_fd_t sd;
AdamGreen 0:616601bde9fb 74 /* q is the whole pbuf chain for a packet, p is the current pbuf in the chain */
AdamGreen 0:616601bde9fb 75 struct pbuf *p, *q;
AdamGreen 0:616601bde9fb 76 enum slipif_recv_state state;
AdamGreen 0:616601bde9fb 77 u16_t i, recved;
AdamGreen 0:616601bde9fb 78 };
AdamGreen 0:616601bde9fb 79
AdamGreen 0:616601bde9fb 80 /**
AdamGreen 0:616601bde9fb 81 * Send a pbuf doing the necessary SLIP encapsulation
AdamGreen 0:616601bde9fb 82 *
AdamGreen 0:616601bde9fb 83 * Uses the serial layer's sio_send()
AdamGreen 0:616601bde9fb 84 *
AdamGreen 0:616601bde9fb 85 * @param netif the lwip network interface structure for this slipif
AdamGreen 0:616601bde9fb 86 * @param p the pbuf chaing packet to send
AdamGreen 0:616601bde9fb 87 * @param ipaddr the ip address to send the packet to (not used for slipif)
AdamGreen 0:616601bde9fb 88 * @return always returns ERR_OK since the serial layer does not provide return values
AdamGreen 0:616601bde9fb 89 */
AdamGreen 0:616601bde9fb 90 err_t
AdamGreen 0:616601bde9fb 91 slipif_output(struct netif *netif, struct pbuf *p, ip_addr_t *ipaddr)
AdamGreen 0:616601bde9fb 92 {
AdamGreen 0:616601bde9fb 93 struct slipif_priv *priv;
AdamGreen 0:616601bde9fb 94 struct pbuf *q;
AdamGreen 0:616601bde9fb 95 u16_t i;
AdamGreen 0:616601bde9fb 96 u8_t c;
AdamGreen 0:616601bde9fb 97
AdamGreen 0:616601bde9fb 98 LWIP_ASSERT("netif != NULL", (netif != NULL));
AdamGreen 0:616601bde9fb 99 LWIP_ASSERT("netif->state != NULL", (netif->state != NULL));
AdamGreen 0:616601bde9fb 100 LWIP_ASSERT("p != NULL", (p != NULL));
AdamGreen 0:616601bde9fb 101
AdamGreen 0:616601bde9fb 102 LWIP_UNUSED_ARG(ipaddr);
AdamGreen 0:616601bde9fb 103
AdamGreen 0:616601bde9fb 104 priv = netif->state;
AdamGreen 0:616601bde9fb 105
AdamGreen 0:616601bde9fb 106 /* Send pbuf out on the serial I/O device. */
AdamGreen 0:616601bde9fb 107 sio_send(SLIP_END, priv->sd);
AdamGreen 0:616601bde9fb 108
AdamGreen 0:616601bde9fb 109 for (q = p; q != NULL; q = q->next) {
AdamGreen 0:616601bde9fb 110 for (i = 0; i < q->len; i++) {
AdamGreen 0:616601bde9fb 111 c = ((u8_t *)q->payload)[i];
AdamGreen 0:616601bde9fb 112 switch (c) {
AdamGreen 0:616601bde9fb 113 case SLIP_END:
AdamGreen 0:616601bde9fb 114 sio_send(SLIP_ESC, priv->sd);
AdamGreen 0:616601bde9fb 115 sio_send(SLIP_ESC_END, priv->sd);
AdamGreen 0:616601bde9fb 116 break;
AdamGreen 0:616601bde9fb 117 case SLIP_ESC:
AdamGreen 0:616601bde9fb 118 sio_send(SLIP_ESC, priv->sd);
AdamGreen 0:616601bde9fb 119 sio_send(SLIP_ESC_ESC, priv->sd);
AdamGreen 0:616601bde9fb 120 break;
AdamGreen 0:616601bde9fb 121 default:
AdamGreen 0:616601bde9fb 122 sio_send(c, priv->sd);
AdamGreen 0:616601bde9fb 123 break;
AdamGreen 0:616601bde9fb 124 }
AdamGreen 0:616601bde9fb 125 }
AdamGreen 0:616601bde9fb 126 }
AdamGreen 0:616601bde9fb 127 sio_send(SLIP_END, priv->sd);
AdamGreen 0:616601bde9fb 128 return ERR_OK;
AdamGreen 0:616601bde9fb 129 }
AdamGreen 0:616601bde9fb 130
AdamGreen 0:616601bde9fb 131 /**
AdamGreen 0:616601bde9fb 132 * Static function for easy use of blockig or non-blocking
AdamGreen 0:616601bde9fb 133 * sio_read
AdamGreen 0:616601bde9fb 134 *
AdamGreen 0:616601bde9fb 135 * @param fd serial device handle
AdamGreen 0:616601bde9fb 136 * @param data pointer to data buffer for receiving
AdamGreen 0:616601bde9fb 137 * @param len maximum length (in bytes) of data to receive
AdamGreen 0:616601bde9fb 138 * @param block if 1, call sio_read; if 0, call sio_tryread
AdamGreen 0:616601bde9fb 139 * @return return value of sio_read of sio_tryread
AdamGreen 0:616601bde9fb 140 */
AdamGreen 0:616601bde9fb 141 static u32_t
AdamGreen 0:616601bde9fb 142 slip_sio_read(sio_fd_t fd, u8_t* data, u32_t len, u8_t block)
AdamGreen 0:616601bde9fb 143 {
AdamGreen 0:616601bde9fb 144 if (block) {
AdamGreen 0:616601bde9fb 145 return sio_read(fd, data, len);
AdamGreen 0:616601bde9fb 146 } else {
AdamGreen 0:616601bde9fb 147 return sio_tryread(fd, data, len);
AdamGreen 0:616601bde9fb 148 }
AdamGreen 0:616601bde9fb 149 }
AdamGreen 0:616601bde9fb 150
AdamGreen 0:616601bde9fb 151 /**
AdamGreen 0:616601bde9fb 152 * Handle the incoming SLIP stream character by character
AdamGreen 0:616601bde9fb 153 *
AdamGreen 0:616601bde9fb 154 * Poll the serial layer by calling sio_read() or sio_tryread().
AdamGreen 0:616601bde9fb 155 *
AdamGreen 0:616601bde9fb 156 * @param netif the lwip network interface structure for this slipif
AdamGreen 0:616601bde9fb 157 * @param block if 1, block until data is received; if 0, return when all data
AdamGreen 0:616601bde9fb 158 * from the buffer is received (multiple calls to this function will
AdamGreen 0:616601bde9fb 159 * return a complete packet, NULL is returned before - used for polling)
AdamGreen 0:616601bde9fb 160 * @return The IP packet when SLIP_END is received
AdamGreen 0:616601bde9fb 161 */
AdamGreen 0:616601bde9fb 162 static struct pbuf *
AdamGreen 0:616601bde9fb 163 slipif_input(struct netif *netif, u8_t block)
AdamGreen 0:616601bde9fb 164 {
AdamGreen 0:616601bde9fb 165 struct slipif_priv *priv;
AdamGreen 0:616601bde9fb 166 u8_t c;
AdamGreen 0:616601bde9fb 167 struct pbuf *t;
AdamGreen 0:616601bde9fb 168
AdamGreen 0:616601bde9fb 169 LWIP_ASSERT("netif != NULL", (netif != NULL));
AdamGreen 0:616601bde9fb 170 LWIP_ASSERT("netif->state != NULL", (netif->state != NULL));
AdamGreen 0:616601bde9fb 171
AdamGreen 0:616601bde9fb 172 priv = netif->state;
AdamGreen 0:616601bde9fb 173
AdamGreen 0:616601bde9fb 174 while (slip_sio_read(priv->sd, &c, 1, block) > 0) {
AdamGreen 0:616601bde9fb 175 switch (priv->state) {
AdamGreen 0:616601bde9fb 176 case SLIP_RECV_NORMAL:
AdamGreen 0:616601bde9fb 177 switch (c) {
AdamGreen 0:616601bde9fb 178 case SLIP_END:
AdamGreen 0:616601bde9fb 179 if (priv->recved > 0) {
AdamGreen 0:616601bde9fb 180 /* Received whole packet. */
AdamGreen 0:616601bde9fb 181 /* Trim the pbuf to the size of the received packet. */
AdamGreen 0:616601bde9fb 182 pbuf_realloc(priv->q, priv->recved);
AdamGreen 0:616601bde9fb 183
AdamGreen 0:616601bde9fb 184 LINK_STATS_INC(link.recv);
AdamGreen 0:616601bde9fb 185
AdamGreen 0:616601bde9fb 186 LWIP_DEBUGF(SLIP_DEBUG, ("slipif: Got packet\n"));
AdamGreen 0:616601bde9fb 187 t = priv->q;
AdamGreen 0:616601bde9fb 188 priv->p = priv->q = NULL;
AdamGreen 0:616601bde9fb 189 priv->i = priv->recved = 0;
AdamGreen 0:616601bde9fb 190 return t;
AdamGreen 0:616601bde9fb 191 }
AdamGreen 0:616601bde9fb 192 continue;
AdamGreen 0:616601bde9fb 193 case SLIP_ESC:
AdamGreen 0:616601bde9fb 194 priv->state = SLIP_RECV_ESCAPE;
AdamGreen 0:616601bde9fb 195 continue;
AdamGreen 0:616601bde9fb 196 }
AdamGreen 0:616601bde9fb 197 break;
AdamGreen 0:616601bde9fb 198 case SLIP_RECV_ESCAPE:
AdamGreen 0:616601bde9fb 199 switch (c) {
AdamGreen 0:616601bde9fb 200 case SLIP_ESC_END:
AdamGreen 0:616601bde9fb 201 c = SLIP_END;
AdamGreen 0:616601bde9fb 202 break;
AdamGreen 0:616601bde9fb 203 case SLIP_ESC_ESC:
AdamGreen 0:616601bde9fb 204 c = SLIP_ESC;
AdamGreen 0:616601bde9fb 205 break;
AdamGreen 0:616601bde9fb 206 }
AdamGreen 0:616601bde9fb 207 priv->state = SLIP_RECV_NORMAL;
AdamGreen 0:616601bde9fb 208 /* FALLTHROUGH */
AdamGreen 0:616601bde9fb 209 }
AdamGreen 0:616601bde9fb 210
AdamGreen 0:616601bde9fb 211 /* byte received, packet not yet completely received */
AdamGreen 0:616601bde9fb 212 if (priv->p == NULL) {
AdamGreen 0:616601bde9fb 213 /* allocate a new pbuf */
AdamGreen 0:616601bde9fb 214 LWIP_DEBUGF(SLIP_DEBUG, ("slipif_input: alloc\n"));
AdamGreen 0:616601bde9fb 215 priv->p = pbuf_alloc(PBUF_LINK, (PBUF_POOL_BUFSIZE - PBUF_LINK_HLEN), PBUF_POOL);
AdamGreen 0:616601bde9fb 216
AdamGreen 0:616601bde9fb 217 if (priv->p == NULL) {
AdamGreen 0:616601bde9fb 218 LINK_STATS_INC(link.drop);
AdamGreen 0:616601bde9fb 219 LWIP_DEBUGF(SLIP_DEBUG, ("slipif_input: no new pbuf! (DROP)\n"));
AdamGreen 0:616601bde9fb 220 /* don't process any further since we got no pbuf to receive to */
AdamGreen 0:616601bde9fb 221 break;
AdamGreen 0:616601bde9fb 222 }
AdamGreen 0:616601bde9fb 223
AdamGreen 0:616601bde9fb 224 if (priv->q != NULL) {
AdamGreen 0:616601bde9fb 225 /* 'chain' the pbuf to the existing chain */
AdamGreen 0:616601bde9fb 226 pbuf_cat(priv->q, priv->p);
AdamGreen 0:616601bde9fb 227 } else {
AdamGreen 0:616601bde9fb 228 /* p is the first pbuf in the chain */
AdamGreen 0:616601bde9fb 229 priv->q = priv->p;
AdamGreen 0:616601bde9fb 230 }
AdamGreen 0:616601bde9fb 231 }
AdamGreen 0:616601bde9fb 232
AdamGreen 0:616601bde9fb 233 /* this automatically drops bytes if > SLIP_MAX_SIZE */
AdamGreen 0:616601bde9fb 234 if ((priv->p != NULL) && (priv->recved <= SLIP_MAX_SIZE)) {
AdamGreen 0:616601bde9fb 235 ((u8_t *)priv->p->payload)[priv->i] = c;
AdamGreen 0:616601bde9fb 236 priv->recved++;
AdamGreen 0:616601bde9fb 237 priv->i++;
AdamGreen 0:616601bde9fb 238 if (priv->i >= priv->p->len) {
AdamGreen 0:616601bde9fb 239 /* on to the next pbuf */
AdamGreen 0:616601bde9fb 240 priv->i = 0;
AdamGreen 0:616601bde9fb 241 if (priv->p->next != NULL && priv->p->next->len > 0) {
AdamGreen 0:616601bde9fb 242 /* p is a chain, on to the next in the chain */
AdamGreen 0:616601bde9fb 243 priv->p = priv->p->next;
AdamGreen 0:616601bde9fb 244 } else {
AdamGreen 0:616601bde9fb 245 /* p is a single pbuf, set it to NULL so next time a new
AdamGreen 0:616601bde9fb 246 * pbuf is allocated */
AdamGreen 0:616601bde9fb 247 priv->p = NULL;
AdamGreen 0:616601bde9fb 248 }
AdamGreen 0:616601bde9fb 249 }
AdamGreen 0:616601bde9fb 250 }
AdamGreen 0:616601bde9fb 251 }
AdamGreen 0:616601bde9fb 252
AdamGreen 0:616601bde9fb 253 return NULL;
AdamGreen 0:616601bde9fb 254 }
AdamGreen 0:616601bde9fb 255
AdamGreen 0:616601bde9fb 256 #if !NO_SYS
AdamGreen 0:616601bde9fb 257 /**
AdamGreen 0:616601bde9fb 258 * The SLIP input thread.
AdamGreen 0:616601bde9fb 259 *
AdamGreen 0:616601bde9fb 260 * Feed the IP layer with incoming packets
AdamGreen 0:616601bde9fb 261 *
AdamGreen 0:616601bde9fb 262 * @param nf the lwip network interface structure for this slipif
AdamGreen 0:616601bde9fb 263 */
AdamGreen 0:616601bde9fb 264 static void
AdamGreen 0:616601bde9fb 265 slipif_loop_thread(void *nf)
AdamGreen 0:616601bde9fb 266 {
AdamGreen 0:616601bde9fb 267 struct pbuf *p;
AdamGreen 0:616601bde9fb 268 struct netif *netif = (struct netif *)nf;
AdamGreen 0:616601bde9fb 269
AdamGreen 0:616601bde9fb 270 while (1) {
AdamGreen 0:616601bde9fb 271 p = slipif_input(netif, SLIP_BLOCK);
AdamGreen 0:616601bde9fb 272 if (p != NULL) {
AdamGreen 0:616601bde9fb 273 if (netif->input(p, netif) != ERR_OK) {
AdamGreen 0:616601bde9fb 274 pbuf_free(p);
AdamGreen 0:616601bde9fb 275 p = NULL;
AdamGreen 0:616601bde9fb 276 }
AdamGreen 0:616601bde9fb 277 }
AdamGreen 0:616601bde9fb 278 }
AdamGreen 0:616601bde9fb 279 }
AdamGreen 0:616601bde9fb 280 #endif /* !NO_SYS */
AdamGreen 0:616601bde9fb 281
AdamGreen 0:616601bde9fb 282 /**
AdamGreen 0:616601bde9fb 283 * SLIP netif initialization
AdamGreen 0:616601bde9fb 284 *
AdamGreen 0:616601bde9fb 285 * Call the arch specific sio_open and remember
AdamGreen 0:616601bde9fb 286 * the opened device in the state field of the netif.
AdamGreen 0:616601bde9fb 287 *
AdamGreen 0:616601bde9fb 288 * @param netif the lwip network interface structure for this slipif
AdamGreen 0:616601bde9fb 289 * @return ERR_OK if serial line could be opened,
AdamGreen 0:616601bde9fb 290 * ERR_MEM if no memory could be allocated,
AdamGreen 0:616601bde9fb 291 * ERR_IF is serial line couldn't be opened
AdamGreen 0:616601bde9fb 292 *
AdamGreen 0:616601bde9fb 293 * @note netif->num must contain the number of the serial port to open
AdamGreen 0:616601bde9fb 294 * (0 by default)
AdamGreen 0:616601bde9fb 295 */
AdamGreen 0:616601bde9fb 296 err_t
AdamGreen 0:616601bde9fb 297 slipif_init(struct netif *netif)
AdamGreen 0:616601bde9fb 298 {
AdamGreen 0:616601bde9fb 299 struct slipif_priv *priv;
AdamGreen 0:616601bde9fb 300
AdamGreen 0:616601bde9fb 301 LWIP_DEBUGF(SLIP_DEBUG, ("slipif_init: netif->num=%"U16_F"\n", (u16_t)netif->num));
AdamGreen 0:616601bde9fb 302
AdamGreen 0:616601bde9fb 303 /* Allocate private data */
AdamGreen 0:616601bde9fb 304 priv = mem_malloc(sizeof(struct slipif_priv));
AdamGreen 0:616601bde9fb 305 if (!priv) {
AdamGreen 0:616601bde9fb 306 return ERR_MEM;
AdamGreen 0:616601bde9fb 307 }
AdamGreen 0:616601bde9fb 308
AdamGreen 0:616601bde9fb 309 netif->name[0] = 's';
AdamGreen 0:616601bde9fb 310 netif->name[1] = 'l';
AdamGreen 0:616601bde9fb 311 netif->output = slipif_output;
AdamGreen 0:616601bde9fb 312 netif->mtu = SLIP_MAX_SIZE;
AdamGreen 0:616601bde9fb 313 netif->flags |= NETIF_FLAG_POINTTOPOINT;
AdamGreen 0:616601bde9fb 314
AdamGreen 0:616601bde9fb 315 /* Try to open the serial port (netif->num contains the port number). */
AdamGreen 0:616601bde9fb 316 priv->sd = sio_open(netif->num);
AdamGreen 0:616601bde9fb 317 if (!priv->sd) {
AdamGreen 0:616601bde9fb 318 /* Opening the serial port failed. */
AdamGreen 0:616601bde9fb 319 mem_free(priv);
AdamGreen 0:616601bde9fb 320 return ERR_IF;
AdamGreen 0:616601bde9fb 321 }
AdamGreen 0:616601bde9fb 322
AdamGreen 0:616601bde9fb 323 /* Initialize private data */
AdamGreen 0:616601bde9fb 324 priv->p = NULL;
AdamGreen 0:616601bde9fb 325 priv->q = NULL;
AdamGreen 0:616601bde9fb 326 priv->state = SLIP_RECV_NORMAL;
AdamGreen 0:616601bde9fb 327 priv->i = 0;
AdamGreen 0:616601bde9fb 328 priv->recved = 0;
AdamGreen 0:616601bde9fb 329
AdamGreen 0:616601bde9fb 330 netif->state = priv;
AdamGreen 0:616601bde9fb 331
AdamGreen 0:616601bde9fb 332 /* initialize the snmp variables and counters inside the struct netif
AdamGreen 0:616601bde9fb 333 * ifSpeed: no assumption can be made without knowing more about the
AdamGreen 0:616601bde9fb 334 * serial line!
AdamGreen 0:616601bde9fb 335 */
AdamGreen 0:616601bde9fb 336 NETIF_INIT_SNMP(netif, snmp_ifType_slip, 0);
AdamGreen 0:616601bde9fb 337
AdamGreen 0:616601bde9fb 338 /* Create a thread to poll the serial line. */
AdamGreen 0:616601bde9fb 339 sys_thread_new(SLIPIF_THREAD_NAME, slipif_loop_thread, netif,
AdamGreen 0:616601bde9fb 340 SLIPIF_THREAD_STACKSIZE, SLIPIF_THREAD_PRIO);
AdamGreen 0:616601bde9fb 341 return ERR_OK;
AdamGreen 0:616601bde9fb 342 }
AdamGreen 0:616601bde9fb 343
AdamGreen 0:616601bde9fb 344 /**
AdamGreen 0:616601bde9fb 345 * Polls the serial device and feeds the IP layer with incoming packets.
AdamGreen 0:616601bde9fb 346 *
AdamGreen 0:616601bde9fb 347 * @param netif The lwip network interface structure for this slipif
AdamGreen 0:616601bde9fb 348 */
AdamGreen 0:616601bde9fb 349 void
AdamGreen 0:616601bde9fb 350 slipif_poll(struct netif *netif)
AdamGreen 0:616601bde9fb 351 {
AdamGreen 0:616601bde9fb 352 struct pbuf *p;
AdamGreen 0:616601bde9fb 353 struct slipif_priv *priv;
AdamGreen 0:616601bde9fb 354
AdamGreen 0:616601bde9fb 355 LWIP_ASSERT("netif != NULL", (netif != NULL));
AdamGreen 0:616601bde9fb 356 LWIP_ASSERT("netif->state != NULL", (netif->state != NULL));
AdamGreen 0:616601bde9fb 357
AdamGreen 0:616601bde9fb 358 priv = netif->state;
AdamGreen 0:616601bde9fb 359
AdamGreen 0:616601bde9fb 360 while ((p = slipif_input(netif, SLIP_DONTBLOCK)) != NULL) {
AdamGreen 0:616601bde9fb 361 if (netif->input(p, netif) != ERR_OK) {
AdamGreen 0:616601bde9fb 362 pbuf_free(p);
AdamGreen 0:616601bde9fb 363 }
AdamGreen 0:616601bde9fb 364 }
AdamGreen 0:616601bde9fb 365 }
AdamGreen 0:616601bde9fb 366
AdamGreen 0:616601bde9fb 367 #endif /* LWIP_HAVE_SLIPIF */