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Dependencies:   mbed

NetServices/lwip/netif/slipif.c@1:f5ac63519541, 2014-03-05 (annotated)

Committer:
Michael J. Spencer
Date:
Wed Mar 05 06:14:02 2014 -0800
Revision:
1:f5ac63519541
Initial commit.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Michael J. Spencer 1:f5ac63519541 1 /**
Michael J. Spencer 1:f5ac63519541 2 * @file
Michael J. Spencer 1:f5ac63519541 3 * SLIP Interface
Michael J. Spencer 1:f5ac63519541 4 *
Michael J. Spencer 1:f5ac63519541 5 */
Michael J. Spencer 1:f5ac63519541 6
Michael J. Spencer 1:f5ac63519541 7 /*
Michael J. Spencer 1:f5ac63519541 8 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
Michael J. Spencer 1:f5ac63519541 9 * All rights reserved.
Michael J. Spencer 1:f5ac63519541 10 *
Michael J. Spencer 1:f5ac63519541 11 * Redistribution and use in source and binary forms, with or without
Michael J. Spencer 1:f5ac63519541 12 * modification, are permitted provided that the following conditions
Michael J. Spencer 1:f5ac63519541 13 * are met:
Michael J. Spencer 1:f5ac63519541 14 * 1. Redistributions of source code must retain the above copyright
Michael J. Spencer 1:f5ac63519541 15 * notice, this list of conditions and the following disclaimer.
Michael J. Spencer 1:f5ac63519541 16 * 2. Redistributions in binary form must reproduce the above copyright
Michael J. Spencer 1:f5ac63519541 17 * notice, this list of conditions and the following disclaimer in the
Michael J. Spencer 1:f5ac63519541 18 * documentation and/or other materials provided with the distribution.
Michael J. Spencer 1:f5ac63519541 19 * 3. Neither the name of the Institute nor the names of its contributors
Michael J. Spencer 1:f5ac63519541 20 * may be used to endorse or promote products derived from this software
Michael J. Spencer 1:f5ac63519541 21 * without specific prior written permission.
Michael J. Spencer 1:f5ac63519541 22 *
Michael J. Spencer 1:f5ac63519541 23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
Michael J. Spencer 1:f5ac63519541 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
Michael J. Spencer 1:f5ac63519541 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
Michael J. Spencer 1:f5ac63519541 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
Michael J. Spencer 1:f5ac63519541 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
Michael J. Spencer 1:f5ac63519541 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
Michael J. Spencer 1:f5ac63519541 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
Michael J. Spencer 1:f5ac63519541 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
Michael J. Spencer 1:f5ac63519541 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
Michael J. Spencer 1:f5ac63519541 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
Michael J. Spencer 1:f5ac63519541 33 * SUCH DAMAGE.
Michael J. Spencer 1:f5ac63519541 34 *
Michael J. Spencer 1:f5ac63519541 35 * This file is built upon the file: src/arch/rtxc/netif/sioslip.c
Michael J. Spencer 1:f5ac63519541 36 *
Michael J. Spencer 1:f5ac63519541 37 * Author: Magnus Ivarsson <magnus.ivarsson(at)volvo.com>
Michael J. Spencer 1:f5ac63519541 38 */
Michael J. Spencer 1:f5ac63519541 39
Michael J. Spencer 1:f5ac63519541 40 /*
Michael J. Spencer 1:f5ac63519541 41 * This is an arch independent SLIP netif. The specific serial hooks must be
Michael J. Spencer 1:f5ac63519541 42 * provided by another file. They are sio_open, sio_read/sio_tryread and sio_send
Michael J. Spencer 1:f5ac63519541 43 */
Michael J. Spencer 1:f5ac63519541 44
Michael J. Spencer 1:f5ac63519541 45 #include "netif/slipif.h"
Michael J. Spencer 1:f5ac63519541 46 #include "lwip/opt.h"
Michael J. Spencer 1:f5ac63519541 47
Michael J. Spencer 1:f5ac63519541 48 #if LWIP_HAVE_SLIPIF
Michael J. Spencer 1:f5ac63519541 49
Michael J. Spencer 1:f5ac63519541 50 #include "lwip/def.h"
Michael J. Spencer 1:f5ac63519541 51 #include "lwip/pbuf.h"
Michael J. Spencer 1:f5ac63519541 52 #include "lwip/sys.h"
Michael J. Spencer 1:f5ac63519541 53 #include "lwip/stats.h"
Michael J. Spencer 1:f5ac63519541 54 #include "lwip/snmp.h"
Michael J. Spencer 1:f5ac63519541 55 #include "lwip/sio.h"
Michael J. Spencer 1:f5ac63519541 56
Michael J. Spencer 1:f5ac63519541 57 #define SLIP_BLOCK 1
Michael J. Spencer 1:f5ac63519541 58 #define SLIP_DONTBLOCK 0
Michael J. Spencer 1:f5ac63519541 59
Michael J. Spencer 1:f5ac63519541 60 #define SLIP_END 0300 /* 0xC0 */
Michael J. Spencer 1:f5ac63519541 61 #define SLIP_ESC 0333 /* 0xDB */
Michael J. Spencer 1:f5ac63519541 62 #define SLIP_ESC_END 0334 /* 0xDC */
Michael J. Spencer 1:f5ac63519541 63 #define SLIP_ESC_ESC 0335 /* 0xDD */
Michael J. Spencer 1:f5ac63519541 64
Michael J. Spencer 1:f5ac63519541 65 #define SLIP_MAX_SIZE 1500
Michael J. Spencer 1:f5ac63519541 66
Michael J. Spencer 1:f5ac63519541 67 enum slipif_recv_state {
Michael J. Spencer 1:f5ac63519541 68 SLIP_RECV_NORMAL,
Michael J. Spencer 1:f5ac63519541 69 SLIP_RECV_ESCAPE,
Michael J. Spencer 1:f5ac63519541 70 };
Michael J. Spencer 1:f5ac63519541 71
Michael J. Spencer 1:f5ac63519541 72 struct slipif_priv {
Michael J. Spencer 1:f5ac63519541 73 sio_fd_t sd;
Michael J. Spencer 1:f5ac63519541 74 /* q is the whole pbuf chain for a packet, p is the current pbuf in the chain */
Michael J. Spencer 1:f5ac63519541 75 struct pbuf *p, *q;
Michael J. Spencer 1:f5ac63519541 76 enum slipif_recv_state state;
Michael J. Spencer 1:f5ac63519541 77 u16_t i, recved;
Michael J. Spencer 1:f5ac63519541 78 };
Michael J. Spencer 1:f5ac63519541 79
Michael J. Spencer 1:f5ac63519541 80 /**
Michael J. Spencer 1:f5ac63519541 81 * Send a pbuf doing the necessary SLIP encapsulation
Michael J. Spencer 1:f5ac63519541 82 *
Michael J. Spencer 1:f5ac63519541 83 * Uses the serial layer's sio_send()
Michael J. Spencer 1:f5ac63519541 84 *
Michael J. Spencer 1:f5ac63519541 85 * @param netif the lwip network interface structure for this slipif
Michael J. Spencer 1:f5ac63519541 86 * @param p the pbuf chaing packet to send
Michael J. Spencer 1:f5ac63519541 87 * @param ipaddr the ip address to send the packet to (not used for slipif)
Michael J. Spencer 1:f5ac63519541 88 * @return always returns ERR_OK since the serial layer does not provide return values
Michael J. Spencer 1:f5ac63519541 89 */
Michael J. Spencer 1:f5ac63519541 90 err_t
Michael J. Spencer 1:f5ac63519541 91 slipif_output(struct netif *netif, struct pbuf *p, ip_addr_t *ipaddr)
Michael J. Spencer 1:f5ac63519541 92 {
Michael J. Spencer 1:f5ac63519541 93 struct slipif_priv *priv;
Michael J. Spencer 1:f5ac63519541 94 struct pbuf *q;
Michael J. Spencer 1:f5ac63519541 95 u16_t i;
Michael J. Spencer 1:f5ac63519541 96 u8_t c;
Michael J. Spencer 1:f5ac63519541 97
Michael J. Spencer 1:f5ac63519541 98 LWIP_ASSERT("netif != NULL", (netif != NULL));
Michael J. Spencer 1:f5ac63519541 99 LWIP_ASSERT("netif->state != NULL", (netif->state != NULL));
Michael J. Spencer 1:f5ac63519541 100 LWIP_ASSERT("p != NULL", (p != NULL));
Michael J. Spencer 1:f5ac63519541 101
Michael J. Spencer 1:f5ac63519541 102 LWIP_UNUSED_ARG(ipaddr);
Michael J. Spencer 1:f5ac63519541 103
Michael J. Spencer 1:f5ac63519541 104 priv = netif->state;
Michael J. Spencer 1:f5ac63519541 105
Michael J. Spencer 1:f5ac63519541 106 /* Send pbuf out on the serial I/O device. */
Michael J. Spencer 1:f5ac63519541 107 sio_send(SLIP_END, priv->sd);
Michael J. Spencer 1:f5ac63519541 108
Michael J. Spencer 1:f5ac63519541 109 for (q = p; q != NULL; q = q->next) {
Michael J. Spencer 1:f5ac63519541 110 for (i = 0; i < q->len; i++) {
Michael J. Spencer 1:f5ac63519541 111 c = ((u8_t *)q->payload)[i];
Michael J. Spencer 1:f5ac63519541 112 switch (c) {
Michael J. Spencer 1:f5ac63519541 113 case SLIP_END:
Michael J. Spencer 1:f5ac63519541 114 sio_send(SLIP_ESC, priv->sd);
Michael J. Spencer 1:f5ac63519541 115 sio_send(SLIP_ESC_END, priv->sd);
Michael J. Spencer 1:f5ac63519541 116 break;
Michael J. Spencer 1:f5ac63519541 117 case SLIP_ESC:
Michael J. Spencer 1:f5ac63519541 118 sio_send(SLIP_ESC, priv->sd);
Michael J. Spencer 1:f5ac63519541 119 sio_send(SLIP_ESC_ESC, priv->sd);
Michael J. Spencer 1:f5ac63519541 120 break;
Michael J. Spencer 1:f5ac63519541 121 default:
Michael J. Spencer 1:f5ac63519541 122 sio_send(c, priv->sd);
Michael J. Spencer 1:f5ac63519541 123 break;
Michael J. Spencer 1:f5ac63519541 124 }
Michael J. Spencer 1:f5ac63519541 125 }
Michael J. Spencer 1:f5ac63519541 126 }
Michael J. Spencer 1:f5ac63519541 127 sio_send(SLIP_END, priv->sd);
Michael J. Spencer 1:f5ac63519541 128 return ERR_OK;
Michael J. Spencer 1:f5ac63519541 129 }
Michael J. Spencer 1:f5ac63519541 130
Michael J. Spencer 1:f5ac63519541 131 /**
Michael J. Spencer 1:f5ac63519541 132 * Static function for easy use of blockig or non-blocking
Michael J. Spencer 1:f5ac63519541 133 * sio_read
Michael J. Spencer 1:f5ac63519541 134 *
Michael J. Spencer 1:f5ac63519541 135 * @param fd serial device handle
Michael J. Spencer 1:f5ac63519541 136 * @param data pointer to data buffer for receiving
Michael J. Spencer 1:f5ac63519541 137 * @param len maximum length (in bytes) of data to receive
Michael J. Spencer 1:f5ac63519541 138 * @param block if 1, call sio_read; if 0, call sio_tryread
Michael J. Spencer 1:f5ac63519541 139 * @return return value of sio_read of sio_tryread
Michael J. Spencer 1:f5ac63519541 140 */
Michael J. Spencer 1:f5ac63519541 141 static u32_t
Michael J. Spencer 1:f5ac63519541 142 slip_sio_read(sio_fd_t fd, u8_t* data, u32_t len, u8_t block)
Michael J. Spencer 1:f5ac63519541 143 {
Michael J. Spencer 1:f5ac63519541 144 if (block) {
Michael J. Spencer 1:f5ac63519541 145 return sio_read(fd, data, len);
Michael J. Spencer 1:f5ac63519541 146 } else {
Michael J. Spencer 1:f5ac63519541 147 return sio_tryread(fd, data, len);
Michael J. Spencer 1:f5ac63519541 148 }
Michael J. Spencer 1:f5ac63519541 149 }
Michael J. Spencer 1:f5ac63519541 150
Michael J. Spencer 1:f5ac63519541 151 /**
Michael J. Spencer 1:f5ac63519541 152 * Handle the incoming SLIP stream character by character
Michael J. Spencer 1:f5ac63519541 153 *
Michael J. Spencer 1:f5ac63519541 154 * Poll the serial layer by calling sio_read() or sio_tryread().
Michael J. Spencer 1:f5ac63519541 155 *
Michael J. Spencer 1:f5ac63519541 156 * @param netif the lwip network interface structure for this slipif
Michael J. Spencer 1:f5ac63519541 157 * @param block if 1, block until data is received; if 0, return when all data
Michael J. Spencer 1:f5ac63519541 158 * from the buffer is received (multiple calls to this function will
Michael J. Spencer 1:f5ac63519541 159 * return a complete packet, NULL is returned before - used for polling)
Michael J. Spencer 1:f5ac63519541 160 * @return The IP packet when SLIP_END is received
Michael J. Spencer 1:f5ac63519541 161 */
Michael J. Spencer 1:f5ac63519541 162 static struct pbuf *
Michael J. Spencer 1:f5ac63519541 163 slipif_input(struct netif *netif, u8_t block)
Michael J. Spencer 1:f5ac63519541 164 {
Michael J. Spencer 1:f5ac63519541 165 struct slipif_priv *priv;
Michael J. Spencer 1:f5ac63519541 166 u8_t c;
Michael J. Spencer 1:f5ac63519541 167 struct pbuf *t;
Michael J. Spencer 1:f5ac63519541 168
Michael J. Spencer 1:f5ac63519541 169 LWIP_ASSERT("netif != NULL", (netif != NULL));
Michael J. Spencer 1:f5ac63519541 170 LWIP_ASSERT("netif->state != NULL", (netif->state != NULL));
Michael J. Spencer 1:f5ac63519541 171
Michael J. Spencer 1:f5ac63519541 172 priv = netif->state;
Michael J. Spencer 1:f5ac63519541 173
Michael J. Spencer 1:f5ac63519541 174 while (slip_sio_read(priv->sd, &c, 1, block) > 0) {
Michael J. Spencer 1:f5ac63519541 175 switch (priv->state) {
Michael J. Spencer 1:f5ac63519541 176 case SLIP_RECV_NORMAL:
Michael J. Spencer 1:f5ac63519541 177 switch (c) {
Michael J. Spencer 1:f5ac63519541 178 case SLIP_END:
Michael J. Spencer 1:f5ac63519541 179 if (priv->recved > 0) {
Michael J. Spencer 1:f5ac63519541 180 /* Received whole packet. */
Michael J. Spencer 1:f5ac63519541 181 /* Trim the pbuf to the size of the received packet. */
Michael J. Spencer 1:f5ac63519541 182 pbuf_realloc(priv->q, priv->recved);
Michael J. Spencer 1:f5ac63519541 183
Michael J. Spencer 1:f5ac63519541 184 LINK_STATS_INC(link.recv);
Michael J. Spencer 1:f5ac63519541 185
Michael J. Spencer 1:f5ac63519541 186 LWIP_DEBUGF(SLIP_DEBUG, ("slipif: Got packet\n"));
Michael J. Spencer 1:f5ac63519541 187 t = priv->q;
Michael J. Spencer 1:f5ac63519541 188 priv->p = priv->q = NULL;
Michael J. Spencer 1:f5ac63519541 189 priv->i = priv->recved = 0;
Michael J. Spencer 1:f5ac63519541 190 return t;
Michael J. Spencer 1:f5ac63519541 191 }
Michael J. Spencer 1:f5ac63519541 192 continue;
Michael J. Spencer 1:f5ac63519541 193 case SLIP_ESC:
Michael J. Spencer 1:f5ac63519541 194 priv->state = SLIP_RECV_ESCAPE;
Michael J. Spencer 1:f5ac63519541 195 continue;
Michael J. Spencer 1:f5ac63519541 196 }
Michael J. Spencer 1:f5ac63519541 197 break;
Michael J. Spencer 1:f5ac63519541 198 case SLIP_RECV_ESCAPE:
Michael J. Spencer 1:f5ac63519541 199 switch (c) {
Michael J. Spencer 1:f5ac63519541 200 case SLIP_ESC_END:
Michael J. Spencer 1:f5ac63519541 201 c = SLIP_END;
Michael J. Spencer 1:f5ac63519541 202 break;
Michael J. Spencer 1:f5ac63519541 203 case SLIP_ESC_ESC:
Michael J. Spencer 1:f5ac63519541 204 c = SLIP_ESC;
Michael J. Spencer 1:f5ac63519541 205 break;
Michael J. Spencer 1:f5ac63519541 206 }
Michael J. Spencer 1:f5ac63519541 207 priv->state = SLIP_RECV_NORMAL;
Michael J. Spencer 1:f5ac63519541 208 /* FALLTHROUGH */
Michael J. Spencer 1:f5ac63519541 209 }
Michael J. Spencer 1:f5ac63519541 210
Michael J. Spencer 1:f5ac63519541 211 /* byte received, packet not yet completely received */
Michael J. Spencer 1:f5ac63519541 212 if (priv->p == NULL) {
Michael J. Spencer 1:f5ac63519541 213 /* allocate a new pbuf */
Michael J. Spencer 1:f5ac63519541 214 LWIP_DEBUGF(SLIP_DEBUG, ("slipif_input: alloc\n"));
Michael J. Spencer 1:f5ac63519541 215 priv->p = pbuf_alloc(PBUF_LINK, (PBUF_POOL_BUFSIZE - PBUF_LINK_HLEN), PBUF_POOL);
Michael J. Spencer 1:f5ac63519541 216
Michael J. Spencer 1:f5ac63519541 217 if (priv->p == NULL) {
Michael J. Spencer 1:f5ac63519541 218 LINK_STATS_INC(link.drop);
Michael J. Spencer 1:f5ac63519541 219 LWIP_DEBUGF(SLIP_DEBUG, ("slipif_input: no new pbuf! (DROP)\n"));
Michael J. Spencer 1:f5ac63519541 220 /* don't process any further since we got no pbuf to receive to */
Michael J. Spencer 1:f5ac63519541 221 break;
Michael J. Spencer 1:f5ac63519541 222 }
Michael J. Spencer 1:f5ac63519541 223
Michael J. Spencer 1:f5ac63519541 224 if (priv->q != NULL) {
Michael J. Spencer 1:f5ac63519541 225 /* 'chain' the pbuf to the existing chain */
Michael J. Spencer 1:f5ac63519541 226 pbuf_cat(priv->q, priv->p);
Michael J. Spencer 1:f5ac63519541 227 } else {
Michael J. Spencer 1:f5ac63519541 228 /* p is the first pbuf in the chain */
Michael J. Spencer 1:f5ac63519541 229 priv->q = priv->p;
Michael J. Spencer 1:f5ac63519541 230 }
Michael J. Spencer 1:f5ac63519541 231 }
Michael J. Spencer 1:f5ac63519541 232
Michael J. Spencer 1:f5ac63519541 233 /* this automatically drops bytes if > SLIP_MAX_SIZE */
Michael J. Spencer 1:f5ac63519541 234 if ((priv->p != NULL) && (priv->recved <= SLIP_MAX_SIZE)) {
Michael J. Spencer 1:f5ac63519541 235 ((u8_t *)priv->p->payload)[priv->i] = c;
Michael J. Spencer 1:f5ac63519541 236 priv->recved++;
Michael J. Spencer 1:f5ac63519541 237 priv->i++;
Michael J. Spencer 1:f5ac63519541 238 if (priv->i >= priv->p->len) {
Michael J. Spencer 1:f5ac63519541 239 /* on to the next pbuf */
Michael J. Spencer 1:f5ac63519541 240 priv->i = 0;
Michael J. Spencer 1:f5ac63519541 241 if (priv->p->next != NULL && priv->p->next->len > 0) {
Michael J. Spencer 1:f5ac63519541 242 /* p is a chain, on to the next in the chain */
Michael J. Spencer 1:f5ac63519541 243 priv->p = priv->p->next;
Michael J. Spencer 1:f5ac63519541 244 } else {
Michael J. Spencer 1:f5ac63519541 245 /* p is a single pbuf, set it to NULL so next time a new
Michael J. Spencer 1:f5ac63519541 246 * pbuf is allocated */
Michael J. Spencer 1:f5ac63519541 247 priv->p = NULL;
Michael J. Spencer 1:f5ac63519541 248 }
Michael J. Spencer 1:f5ac63519541 249 }
Michael J. Spencer 1:f5ac63519541 250 }
Michael J. Spencer 1:f5ac63519541 251 }
Michael J. Spencer 1:f5ac63519541 252
Michael J. Spencer 1:f5ac63519541 253 return NULL;
Michael J. Spencer 1:f5ac63519541 254 }
Michael J. Spencer 1:f5ac63519541 255
Michael J. Spencer 1:f5ac63519541 256 #if !NO_SYS
Michael J. Spencer 1:f5ac63519541 257 /**
Michael J. Spencer 1:f5ac63519541 258 * The SLIP input thread.
Michael J. Spencer 1:f5ac63519541 259 *
Michael J. Spencer 1:f5ac63519541 260 * Feed the IP layer with incoming packets
Michael J. Spencer 1:f5ac63519541 261 *
Michael J. Spencer 1:f5ac63519541 262 * @param nf the lwip network interface structure for this slipif
Michael J. Spencer 1:f5ac63519541 263 */
Michael J. Spencer 1:f5ac63519541 264 static void
Michael J. Spencer 1:f5ac63519541 265 slipif_loop_thread(void *nf)
Michael J. Spencer 1:f5ac63519541 266 {
Michael J. Spencer 1:f5ac63519541 267 struct pbuf *p;
Michael J. Spencer 1:f5ac63519541 268 struct netif *netif = (struct netif *)nf;
Michael J. Spencer 1:f5ac63519541 269
Michael J. Spencer 1:f5ac63519541 270 while (1) {
Michael J. Spencer 1:f5ac63519541 271 p = slipif_input(netif, SLIP_BLOCK);
Michael J. Spencer 1:f5ac63519541 272 if (p != NULL) {
Michael J. Spencer 1:f5ac63519541 273 if (netif->input(p, netif) != ERR_OK) {
Michael J. Spencer 1:f5ac63519541 274 pbuf_free(p);
Michael J. Spencer 1:f5ac63519541 275 p = NULL;
Michael J. Spencer 1:f5ac63519541 276 }
Michael J. Spencer 1:f5ac63519541 277 }
Michael J. Spencer 1:f5ac63519541 278 }
Michael J. Spencer 1:f5ac63519541 279 }
Michael J. Spencer 1:f5ac63519541 280 #endif /* !NO_SYS */
Michael J. Spencer 1:f5ac63519541 281
Michael J. Spencer 1:f5ac63519541 282 /**
Michael J. Spencer 1:f5ac63519541 283 * SLIP netif initialization
Michael J. Spencer 1:f5ac63519541 284 *
Michael J. Spencer 1:f5ac63519541 285 * Call the arch specific sio_open and remember
Michael J. Spencer 1:f5ac63519541 286 * the opened device in the state field of the netif.
Michael J. Spencer 1:f5ac63519541 287 *
Michael J. Spencer 1:f5ac63519541 288 * @param netif the lwip network interface structure for this slipif
Michael J. Spencer 1:f5ac63519541 289 * @return ERR_OK if serial line could be opened,
Michael J. Spencer 1:f5ac63519541 290 * ERR_MEM if no memory could be allocated,
Michael J. Spencer 1:f5ac63519541 291 * ERR_IF is serial line couldn't be opened
Michael J. Spencer 1:f5ac63519541 292 *
Michael J. Spencer 1:f5ac63519541 293 * @note netif->num must contain the number of the serial port to open
Michael J. Spencer 1:f5ac63519541 294 * (0 by default)
Michael J. Spencer 1:f5ac63519541 295 */
Michael J. Spencer 1:f5ac63519541 296 err_t
Michael J. Spencer 1:f5ac63519541 297 slipif_init(struct netif *netif)
Michael J. Spencer 1:f5ac63519541 298 {
Michael J. Spencer 1:f5ac63519541 299 struct slipif_priv *priv;
Michael J. Spencer 1:f5ac63519541 300
Michael J. Spencer 1:f5ac63519541 301 LWIP_DEBUGF(SLIP_DEBUG, ("slipif_init: netif->num=%"U16_F"\n", (u16_t)netif->num));
Michael J. Spencer 1:f5ac63519541 302
Michael J. Spencer 1:f5ac63519541 303 /* Allocate private data */
Michael J. Spencer 1:f5ac63519541 304 priv = mem_malloc(sizeof(struct slipif_priv));
Michael J. Spencer 1:f5ac63519541 305 if (!priv) {
Michael J. Spencer 1:f5ac63519541 306 return ERR_MEM;
Michael J. Spencer 1:f5ac63519541 307 }
Michael J. Spencer 1:f5ac63519541 308
Michael J. Spencer 1:f5ac63519541 309 netif->name[0] = 's';
Michael J. Spencer 1:f5ac63519541 310 netif->name[1] = 'l';
Michael J. Spencer 1:f5ac63519541 311 netif->output = slipif_output;
Michael J. Spencer 1:f5ac63519541 312 netif->mtu = SLIP_MAX_SIZE;
Michael J. Spencer 1:f5ac63519541 313 netif->flags |= NETIF_FLAG_POINTTOPOINT;
Michael J. Spencer 1:f5ac63519541 314
Michael J. Spencer 1:f5ac63519541 315 /* Try to open the serial port (netif->num contains the port number). */
Michael J. Spencer 1:f5ac63519541 316 priv->sd = sio_open(netif->num);
Michael J. Spencer 1:f5ac63519541 317 if (!priv->sd) {
Michael J. Spencer 1:f5ac63519541 318 /* Opening the serial port failed. */
Michael J. Spencer 1:f5ac63519541 319 mem_free(priv);
Michael J. Spencer 1:f5ac63519541 320 return ERR_IF;
Michael J. Spencer 1:f5ac63519541 321 }
Michael J. Spencer 1:f5ac63519541 322
Michael J. Spencer 1:f5ac63519541 323 /* Initialize private data */
Michael J. Spencer 1:f5ac63519541 324 priv->p = NULL;
Michael J. Spencer 1:f5ac63519541 325 priv->q = NULL;
Michael J. Spencer 1:f5ac63519541 326 priv->state = SLIP_RECV_NORMAL;
Michael J. Spencer 1:f5ac63519541 327 priv->i = 0;
Michael J. Spencer 1:f5ac63519541 328 priv->recved = 0;
Michael J. Spencer 1:f5ac63519541 329
Michael J. Spencer 1:f5ac63519541 330 netif->state = priv;
Michael J. Spencer 1:f5ac63519541 331
Michael J. Spencer 1:f5ac63519541 332 /* initialize the snmp variables and counters inside the struct netif
Michael J. Spencer 1:f5ac63519541 333 * ifSpeed: no assumption can be made without knowing more about the
Michael J. Spencer 1:f5ac63519541 334 * serial line!
Michael J. Spencer 1:f5ac63519541 335 */
Michael J. Spencer 1:f5ac63519541 336 NETIF_INIT_SNMP(netif, snmp_ifType_slip, 0);
Michael J. Spencer 1:f5ac63519541 337
Michael J. Spencer 1:f5ac63519541 338 /* Create a thread to poll the serial line. */
Michael J. Spencer 1:f5ac63519541 339 sys_thread_new(SLIPIF_THREAD_NAME, slipif_loop_thread, netif,
Michael J. Spencer 1:f5ac63519541 340 SLIPIF_THREAD_STACKSIZE, SLIPIF_THREAD_PRIO);
Michael J. Spencer 1:f5ac63519541 341 return ERR_OK;
Michael J. Spencer 1:f5ac63519541 342 }
Michael J. Spencer 1:f5ac63519541 343
Michael J. Spencer 1:f5ac63519541 344 /**
Michael J. Spencer 1:f5ac63519541 345 * Polls the serial device and feeds the IP layer with incoming packets.
Michael J. Spencer 1:f5ac63519541 346 *
Michael J. Spencer 1:f5ac63519541 347 * @param netif The lwip network interface structure for this slipif
Michael J. Spencer 1:f5ac63519541 348 */
Michael J. Spencer 1:f5ac63519541 349 void
Michael J. Spencer 1:f5ac63519541 350 slipif_poll(struct netif *netif)
Michael J. Spencer 1:f5ac63519541 351 {
Michael J. Spencer 1:f5ac63519541 352 struct pbuf *p;
Michael J. Spencer 1:f5ac63519541 353 struct slipif_priv *priv;
Michael J. Spencer 1:f5ac63519541 354
Michael J. Spencer 1:f5ac63519541 355 LWIP_ASSERT("netif != NULL", (netif != NULL));
Michael J. Spencer 1:f5ac63519541 356 LWIP_ASSERT("netif->state != NULL", (netif->state != NULL));
Michael J. Spencer 1:f5ac63519541 357
Michael J. Spencer 1:f5ac63519541 358 priv = netif->state;
Michael J. Spencer 1:f5ac63519541 359
Michael J. Spencer 1:f5ac63519541 360 while ((p = slipif_input(netif, SLIP_DONTBLOCK)) != NULL) {
Michael J. Spencer 1:f5ac63519541 361 if (netif->input(p, netif) != ERR_OK) {
Michael J. Spencer 1:f5ac63519541 362 pbuf_free(p);
Michael J. Spencer 1:f5ac63519541 363 }
Michael J. Spencer 1:f5ac63519541 364 }
Michael J. Spencer 1:f5ac63519541 365 }
Michael J. Spencer 1:f5ac63519541 366
Michael J. Spencer 1:f5ac63519541 367 #endif /* LWIP_HAVE_SLIPIF */