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Dependencies:   BufferedSerial FatFileSystemCpp mbed

EthernetInterface/lwip/netif/slipif.c@74:a1bf25282cb1, 2022-02-10 (annotated)

Committer:
JamieB
Date:
Thu Feb 10 10:43:50 2022 +0000
Revision:
74:a1bf25282cb1
Parent:
22:0dd9c1b5664a 
Incremented version to 0.27 (forgot to on the last commit...)

Who changed what in which revision?

UserRevisionLine numberNew contents of line
AndyA 22:0dd9c1b5664a 1 /**
AndyA 22:0dd9c1b5664a 2 * @file
AndyA 22:0dd9c1b5664a 3 * SLIP Interface
AndyA 22:0dd9c1b5664a 4 *
AndyA 22:0dd9c1b5664a 5 */
AndyA 22:0dd9c1b5664a 6
AndyA 22:0dd9c1b5664a 7 /*
AndyA 22:0dd9c1b5664a 8 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
AndyA 22:0dd9c1b5664a 9 * All rights reserved.
AndyA 22:0dd9c1b5664a 10 *
AndyA 22:0dd9c1b5664a 11 * Redistribution and use in source and binary forms, with or without
AndyA 22:0dd9c1b5664a 12 * modification, are permitted provided that the following conditions
AndyA 22:0dd9c1b5664a 13 * are met:
AndyA 22:0dd9c1b5664a 14 * 1. Redistributions of source code must retain the above copyright
AndyA 22:0dd9c1b5664a 15 * notice, this list of conditions and the following disclaimer.
AndyA 22:0dd9c1b5664a 16 * 2. Redistributions in binary form must reproduce the above copyright
AndyA 22:0dd9c1b5664a 17 * notice, this list of conditions and the following disclaimer in the
AndyA 22:0dd9c1b5664a 18 * documentation and/or other materials provided with the distribution.
AndyA 22:0dd9c1b5664a 19 * 3. Neither the name of the Institute nor the names of its contributors
AndyA 22:0dd9c1b5664a 20 * may be used to endorse or promote products derived from this software
AndyA 22:0dd9c1b5664a 21 * without specific prior written permission.
AndyA 22:0dd9c1b5664a 22 *
AndyA 22:0dd9c1b5664a 23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
AndyA 22:0dd9c1b5664a 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
AndyA 22:0dd9c1b5664a 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
AndyA 22:0dd9c1b5664a 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
AndyA 22:0dd9c1b5664a 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
AndyA 22:0dd9c1b5664a 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
AndyA 22:0dd9c1b5664a 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
AndyA 22:0dd9c1b5664a 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
AndyA 22:0dd9c1b5664a 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
AndyA 22:0dd9c1b5664a 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
AndyA 22:0dd9c1b5664a 33 * SUCH DAMAGE.
AndyA 22:0dd9c1b5664a 34 *
AndyA 22:0dd9c1b5664a 35 * This file is built upon the file: src/arch/rtxc/netif/sioslip.c
AndyA 22:0dd9c1b5664a 36 *
AndyA 22:0dd9c1b5664a 37 * Author: Magnus Ivarsson <magnus.ivarsson(at)volvo.com>
AndyA 22:0dd9c1b5664a 38 */
AndyA 22:0dd9c1b5664a 39
AndyA 22:0dd9c1b5664a 40 /*
AndyA 22:0dd9c1b5664a 41 * This is an arch independent SLIP netif. The specific serial hooks must be
AndyA 22:0dd9c1b5664a 42 * provided by another file. They are sio_open, sio_read/sio_tryread and sio_send
AndyA 22:0dd9c1b5664a 43 */
AndyA 22:0dd9c1b5664a 44
AndyA 22:0dd9c1b5664a 45 #include "netif/slipif.h"
AndyA 22:0dd9c1b5664a 46 #include "lwip/opt.h"
AndyA 22:0dd9c1b5664a 47
AndyA 22:0dd9c1b5664a 48 #if LWIP_HAVE_SLIPIF
AndyA 22:0dd9c1b5664a 49
AndyA 22:0dd9c1b5664a 50 #include "lwip/def.h"
AndyA 22:0dd9c1b5664a 51 #include "lwip/pbuf.h"
AndyA 22:0dd9c1b5664a 52 #include "lwip/sys.h"
AndyA 22:0dd9c1b5664a 53 #include "lwip/stats.h"
AndyA 22:0dd9c1b5664a 54 #include "lwip/snmp.h"
AndyA 22:0dd9c1b5664a 55 #include "lwip/sio.h"
AndyA 22:0dd9c1b5664a 56
AndyA 22:0dd9c1b5664a 57 #define SLIP_BLOCK 1
AndyA 22:0dd9c1b5664a 58 #define SLIP_DONTBLOCK 0
AndyA 22:0dd9c1b5664a 59
AndyA 22:0dd9c1b5664a 60 #define SLIP_END 0300 /* 0xC0 */
AndyA 22:0dd9c1b5664a 61 #define SLIP_ESC 0333 /* 0xDB */
AndyA 22:0dd9c1b5664a 62 #define SLIP_ESC_END 0334 /* 0xDC */
AndyA 22:0dd9c1b5664a 63 #define SLIP_ESC_ESC 0335 /* 0xDD */
AndyA 22:0dd9c1b5664a 64
AndyA 22:0dd9c1b5664a 65 #define SLIP_MAX_SIZE 1500
AndyA 22:0dd9c1b5664a 66
AndyA 22:0dd9c1b5664a 67 enum slipif_recv_state {
AndyA 22:0dd9c1b5664a 68 SLIP_RECV_NORMAL,
AndyA 22:0dd9c1b5664a 69 SLIP_RECV_ESCAPE,
AndyA 22:0dd9c1b5664a 70 };
AndyA 22:0dd9c1b5664a 71
AndyA 22:0dd9c1b5664a 72 struct slipif_priv {
AndyA 22:0dd9c1b5664a 73 sio_fd_t sd;
AndyA 22:0dd9c1b5664a 74 /* q is the whole pbuf chain for a packet, p is the current pbuf in the chain */
AndyA 22:0dd9c1b5664a 75 struct pbuf *p, *q;
AndyA 22:0dd9c1b5664a 76 enum slipif_recv_state state;
AndyA 22:0dd9c1b5664a 77 u16_t i, recved;
AndyA 22:0dd9c1b5664a 78 };
AndyA 22:0dd9c1b5664a 79
AndyA 22:0dd9c1b5664a 80 /**
AndyA 22:0dd9c1b5664a 81 * Send a pbuf doing the necessary SLIP encapsulation
AndyA 22:0dd9c1b5664a 82 *
AndyA 22:0dd9c1b5664a 83 * Uses the serial layer's sio_send()
AndyA 22:0dd9c1b5664a 84 *
AndyA 22:0dd9c1b5664a 85 * @param netif the lwip network interface structure for this slipif
AndyA 22:0dd9c1b5664a 86 * @param p the pbuf chaing packet to send
AndyA 22:0dd9c1b5664a 87 * @param ipaddr the ip address to send the packet to (not used for slipif)
AndyA 22:0dd9c1b5664a 88 * @return always returns ERR_OK since the serial layer does not provide return values
AndyA 22:0dd9c1b5664a 89 */
AndyA 22:0dd9c1b5664a 90 err_t
AndyA 22:0dd9c1b5664a 91 slipif_output(struct netif *netif, struct pbuf *p, ip_addr_t *ipaddr)
AndyA 22:0dd9c1b5664a 92 {
AndyA 22:0dd9c1b5664a 93 struct slipif_priv *priv;
AndyA 22:0dd9c1b5664a 94 struct pbuf *q;
AndyA 22:0dd9c1b5664a 95 u16_t i;
AndyA 22:0dd9c1b5664a 96 u8_t c;
AndyA 22:0dd9c1b5664a 97
AndyA 22:0dd9c1b5664a 98 LWIP_ASSERT("netif != NULL", (netif != NULL));
AndyA 22:0dd9c1b5664a 99 LWIP_ASSERT("netif->state != NULL", (netif->state != NULL));
AndyA 22:0dd9c1b5664a 100 LWIP_ASSERT("p != NULL", (p != NULL));
AndyA 22:0dd9c1b5664a 101
AndyA 22:0dd9c1b5664a 102 LWIP_UNUSED_ARG(ipaddr);
AndyA 22:0dd9c1b5664a 103
AndyA 22:0dd9c1b5664a 104 priv = netif->state;
AndyA 22:0dd9c1b5664a 105
AndyA 22:0dd9c1b5664a 106 /* Send pbuf out on the serial I/O device. */
AndyA 22:0dd9c1b5664a 107 sio_send(SLIP_END, priv->sd);
AndyA 22:0dd9c1b5664a 108
AndyA 22:0dd9c1b5664a 109 for (q = p; q != NULL; q = q->next) {
AndyA 22:0dd9c1b5664a 110 for (i = 0; i < q->len; i++) {
AndyA 22:0dd9c1b5664a 111 c = ((u8_t *)q->payload)[i];
AndyA 22:0dd9c1b5664a 112 switch (c) {
AndyA 22:0dd9c1b5664a 113 case SLIP_END:
AndyA 22:0dd9c1b5664a 114 sio_send(SLIP_ESC, priv->sd);
AndyA 22:0dd9c1b5664a 115 sio_send(SLIP_ESC_END, priv->sd);
AndyA 22:0dd9c1b5664a 116 break;
AndyA 22:0dd9c1b5664a 117 case SLIP_ESC:
AndyA 22:0dd9c1b5664a 118 sio_send(SLIP_ESC, priv->sd);
AndyA 22:0dd9c1b5664a 119 sio_send(SLIP_ESC_ESC, priv->sd);
AndyA 22:0dd9c1b5664a 120 break;
AndyA 22:0dd9c1b5664a 121 default:
AndyA 22:0dd9c1b5664a 122 sio_send(c, priv->sd);
AndyA 22:0dd9c1b5664a 123 break;
AndyA 22:0dd9c1b5664a 124 }
AndyA 22:0dd9c1b5664a 125 }
AndyA 22:0dd9c1b5664a 126 }
AndyA 22:0dd9c1b5664a 127 sio_send(SLIP_END, priv->sd);
AndyA 22:0dd9c1b5664a 128 return ERR_OK;
AndyA 22:0dd9c1b5664a 129 }
AndyA 22:0dd9c1b5664a 130
AndyA 22:0dd9c1b5664a 131 /**
AndyA 22:0dd9c1b5664a 132 * Static function for easy use of blockig or non-blocking
AndyA 22:0dd9c1b5664a 133 * sio_read
AndyA 22:0dd9c1b5664a 134 *
AndyA 22:0dd9c1b5664a 135 * @param fd serial device handle
AndyA 22:0dd9c1b5664a 136 * @param data pointer to data buffer for receiving
AndyA 22:0dd9c1b5664a 137 * @param len maximum length (in bytes) of data to receive
AndyA 22:0dd9c1b5664a 138 * @param block if 1, call sio_read; if 0, call sio_tryread
AndyA 22:0dd9c1b5664a 139 * @return return value of sio_read of sio_tryread
AndyA 22:0dd9c1b5664a 140 */
AndyA 22:0dd9c1b5664a 141 static u32_t
AndyA 22:0dd9c1b5664a 142 slip_sio_read(sio_fd_t fd, u8_t* data, u32_t len, u8_t block)
AndyA 22:0dd9c1b5664a 143 {
AndyA 22:0dd9c1b5664a 144 if (block) {
AndyA 22:0dd9c1b5664a 145 return sio_read(fd, data, len);
AndyA 22:0dd9c1b5664a 146 } else {
AndyA 22:0dd9c1b5664a 147 return sio_tryread(fd, data, len);
AndyA 22:0dd9c1b5664a 148 }
AndyA 22:0dd9c1b5664a 149 }
AndyA 22:0dd9c1b5664a 150
AndyA 22:0dd9c1b5664a 151 /**
AndyA 22:0dd9c1b5664a 152 * Handle the incoming SLIP stream character by character
AndyA 22:0dd9c1b5664a 153 *
AndyA 22:0dd9c1b5664a 154 * Poll the serial layer by calling sio_read() or sio_tryread().
AndyA 22:0dd9c1b5664a 155 *
AndyA 22:0dd9c1b5664a 156 * @param netif the lwip network interface structure for this slipif
AndyA 22:0dd9c1b5664a 157 * @param block if 1, block until data is received; if 0, return when all data
AndyA 22:0dd9c1b5664a 158 * from the buffer is received (multiple calls to this function will
AndyA 22:0dd9c1b5664a 159 * return a complete packet, NULL is returned before - used for polling)
AndyA 22:0dd9c1b5664a 160 * @return The IP packet when SLIP_END is received
AndyA 22:0dd9c1b5664a 161 */
AndyA 22:0dd9c1b5664a 162 static struct pbuf *
AndyA 22:0dd9c1b5664a 163 slipif_input(struct netif *netif, u8_t block)
AndyA 22:0dd9c1b5664a 164 {
AndyA 22:0dd9c1b5664a 165 struct slipif_priv *priv;
AndyA 22:0dd9c1b5664a 166 u8_t c;
AndyA 22:0dd9c1b5664a 167 struct pbuf *t;
AndyA 22:0dd9c1b5664a 168
AndyA 22:0dd9c1b5664a 169 LWIP_ASSERT("netif != NULL", (netif != NULL));
AndyA 22:0dd9c1b5664a 170 LWIP_ASSERT("netif->state != NULL", (netif->state != NULL));
AndyA 22:0dd9c1b5664a 171
AndyA 22:0dd9c1b5664a 172 priv = netif->state;
AndyA 22:0dd9c1b5664a 173
AndyA 22:0dd9c1b5664a 174 while (slip_sio_read(priv->sd, &c, 1, block) > 0) {
AndyA 22:0dd9c1b5664a 175 switch (priv->state) {
AndyA 22:0dd9c1b5664a 176 case SLIP_RECV_NORMAL:
AndyA 22:0dd9c1b5664a 177 switch (c) {
AndyA 22:0dd9c1b5664a 178 case SLIP_END:
AndyA 22:0dd9c1b5664a 179 if (priv->recved > 0) {
AndyA 22:0dd9c1b5664a 180 /* Received whole packet. */
AndyA 22:0dd9c1b5664a 181 /* Trim the pbuf to the size of the received packet. */
AndyA 22:0dd9c1b5664a 182 pbuf_realloc(priv->q, priv->recved);
AndyA 22:0dd9c1b5664a 183
AndyA 22:0dd9c1b5664a 184 LINK_STATS_INC(link.recv);
AndyA 22:0dd9c1b5664a 185
AndyA 22:0dd9c1b5664a 186 LWIP_DEBUGF(SLIP_DEBUG, ("slipif: Got packet\n"));
AndyA 22:0dd9c1b5664a 187 t = priv->q;
AndyA 22:0dd9c1b5664a 188 priv->p = priv->q = NULL;
AndyA 22:0dd9c1b5664a 189 priv->i = priv->recved = 0;
AndyA 22:0dd9c1b5664a 190 return t;
AndyA 22:0dd9c1b5664a 191 }
AndyA 22:0dd9c1b5664a 192 continue;
AndyA 22:0dd9c1b5664a 193 case SLIP_ESC:
AndyA 22:0dd9c1b5664a 194 priv->state = SLIP_RECV_ESCAPE;
AndyA 22:0dd9c1b5664a 195 continue;
AndyA 22:0dd9c1b5664a 196 }
AndyA 22:0dd9c1b5664a 197 break;
AndyA 22:0dd9c1b5664a 198 case SLIP_RECV_ESCAPE:
AndyA 22:0dd9c1b5664a 199 switch (c) {
AndyA 22:0dd9c1b5664a 200 case SLIP_ESC_END:
AndyA 22:0dd9c1b5664a 201 c = SLIP_END;
AndyA 22:0dd9c1b5664a 202 break;
AndyA 22:0dd9c1b5664a 203 case SLIP_ESC_ESC:
AndyA 22:0dd9c1b5664a 204 c = SLIP_ESC;
AndyA 22:0dd9c1b5664a 205 break;
AndyA 22:0dd9c1b5664a 206 }
AndyA 22:0dd9c1b5664a 207 priv->state = SLIP_RECV_NORMAL;
AndyA 22:0dd9c1b5664a 208 /* FALLTHROUGH */
AndyA 22:0dd9c1b5664a 209 }
AndyA 22:0dd9c1b5664a 210
AndyA 22:0dd9c1b5664a 211 /* byte received, packet not yet completely received */
AndyA 22:0dd9c1b5664a 212 if (priv->p == NULL) {
AndyA 22:0dd9c1b5664a 213 /* allocate a new pbuf */
AndyA 22:0dd9c1b5664a 214 LWIP_DEBUGF(SLIP_DEBUG, ("slipif_input: alloc\n"));
AndyA 22:0dd9c1b5664a 215 priv->p = pbuf_alloc(PBUF_LINK, (PBUF_POOL_BUFSIZE - PBUF_LINK_HLEN), PBUF_POOL);
AndyA 22:0dd9c1b5664a 216
AndyA 22:0dd9c1b5664a 217 if (priv->p == NULL) {
AndyA 22:0dd9c1b5664a 218 LINK_STATS_INC(link.drop);
AndyA 22:0dd9c1b5664a 219 LWIP_DEBUGF(SLIP_DEBUG, ("slipif_input: no new pbuf! (DROP)\n"));
AndyA 22:0dd9c1b5664a 220 /* don't process any further since we got no pbuf to receive to */
AndyA 22:0dd9c1b5664a 221 break;
AndyA 22:0dd9c1b5664a 222 }
AndyA 22:0dd9c1b5664a 223
AndyA 22:0dd9c1b5664a 224 if (priv->q != NULL) {
AndyA 22:0dd9c1b5664a 225 /* 'chain' the pbuf to the existing chain */
AndyA 22:0dd9c1b5664a 226 pbuf_cat(priv->q, priv->p);
AndyA 22:0dd9c1b5664a 227 } else {
AndyA 22:0dd9c1b5664a 228 /* p is the first pbuf in the chain */
AndyA 22:0dd9c1b5664a 229 priv->q = priv->p;
AndyA 22:0dd9c1b5664a 230 }
AndyA 22:0dd9c1b5664a 231 }
AndyA 22:0dd9c1b5664a 232
AndyA 22:0dd9c1b5664a 233 /* this automatically drops bytes if > SLIP_MAX_SIZE */
AndyA 22:0dd9c1b5664a 234 if ((priv->p != NULL) && (priv->recved <= SLIP_MAX_SIZE)) {
AndyA 22:0dd9c1b5664a 235 ((u8_t *)priv->p->payload)[priv->i] = c;
AndyA 22:0dd9c1b5664a 236 priv->recved++;
AndyA 22:0dd9c1b5664a 237 priv->i++;
AndyA 22:0dd9c1b5664a 238 if (priv->i >= priv->p->len) {
AndyA 22:0dd9c1b5664a 239 /* on to the next pbuf */
AndyA 22:0dd9c1b5664a 240 priv->i = 0;
AndyA 22:0dd9c1b5664a 241 if (priv->p->next != NULL && priv->p->next->len > 0) {
AndyA 22:0dd9c1b5664a 242 /* p is a chain, on to the next in the chain */
AndyA 22:0dd9c1b5664a 243 priv->p = priv->p->next;
AndyA 22:0dd9c1b5664a 244 } else {
AndyA 22:0dd9c1b5664a 245 /* p is a single pbuf, set it to NULL so next time a new
AndyA 22:0dd9c1b5664a 246 * pbuf is allocated */
AndyA 22:0dd9c1b5664a 247 priv->p = NULL;
AndyA 22:0dd9c1b5664a 248 }
AndyA 22:0dd9c1b5664a 249 }
AndyA 22:0dd9c1b5664a 250 }
AndyA 22:0dd9c1b5664a 251 }
AndyA 22:0dd9c1b5664a 252
AndyA 22:0dd9c1b5664a 253 return NULL;
AndyA 22:0dd9c1b5664a 254 }
AndyA 22:0dd9c1b5664a 255
AndyA 22:0dd9c1b5664a 256 #if !NO_SYS
AndyA 22:0dd9c1b5664a 257 /**
AndyA 22:0dd9c1b5664a 258 * The SLIP input thread.
AndyA 22:0dd9c1b5664a 259 *
AndyA 22:0dd9c1b5664a 260 * Feed the IP layer with incoming packets
AndyA 22:0dd9c1b5664a 261 *
AndyA 22:0dd9c1b5664a 262 * @param nf the lwip network interface structure for this slipif
AndyA 22:0dd9c1b5664a 263 */
AndyA 22:0dd9c1b5664a 264 static void
AndyA 22:0dd9c1b5664a 265 slipif_loop_thread(void *nf)
AndyA 22:0dd9c1b5664a 266 {
AndyA 22:0dd9c1b5664a 267 struct pbuf *p;
AndyA 22:0dd9c1b5664a 268 struct netif *netif = (struct netif *)nf;
AndyA 22:0dd9c1b5664a 269
AndyA 22:0dd9c1b5664a 270 while (1) {
AndyA 22:0dd9c1b5664a 271 p = slipif_input(netif, SLIP_BLOCK);
AndyA 22:0dd9c1b5664a 272 if (p != NULL) {
AndyA 22:0dd9c1b5664a 273 if (netif->input(p, netif) != ERR_OK) {
AndyA 22:0dd9c1b5664a 274 pbuf_free(p);
AndyA 22:0dd9c1b5664a 275 p = NULL;
AndyA 22:0dd9c1b5664a 276 }
AndyA 22:0dd9c1b5664a 277 }
AndyA 22:0dd9c1b5664a 278 }
AndyA 22:0dd9c1b5664a 279 }
AndyA 22:0dd9c1b5664a 280 #endif /* !NO_SYS */
AndyA 22:0dd9c1b5664a 281
AndyA 22:0dd9c1b5664a 282 /**
AndyA 22:0dd9c1b5664a 283 * SLIP netif initialization
AndyA 22:0dd9c1b5664a 284 *
AndyA 22:0dd9c1b5664a 285 * Call the arch specific sio_open and remember
AndyA 22:0dd9c1b5664a 286 * the opened device in the state field of the netif.
AndyA 22:0dd9c1b5664a 287 *
AndyA 22:0dd9c1b5664a 288 * @param netif the lwip network interface structure for this slipif
AndyA 22:0dd9c1b5664a 289 * @return ERR_OK if serial line could be opened,
AndyA 22:0dd9c1b5664a 290 * ERR_MEM if no memory could be allocated,
AndyA 22:0dd9c1b5664a 291 * ERR_IF is serial line couldn't be opened
AndyA 22:0dd9c1b5664a 292 *
AndyA 22:0dd9c1b5664a 293 * @note netif->num must contain the number of the serial port to open
AndyA 22:0dd9c1b5664a 294 * (0 by default)
AndyA 22:0dd9c1b5664a 295 */
AndyA 22:0dd9c1b5664a 296 err_t
AndyA 22:0dd9c1b5664a 297 slipif_init(struct netif *netif)
AndyA 22:0dd9c1b5664a 298 {
AndyA 22:0dd9c1b5664a 299 struct slipif_priv *priv;
AndyA 22:0dd9c1b5664a 300
AndyA 22:0dd9c1b5664a 301 LWIP_DEBUGF(SLIP_DEBUG, ("slipif_init: netif->num=%"U16_F"\n", (u16_t)netif->num));
AndyA 22:0dd9c1b5664a 302
AndyA 22:0dd9c1b5664a 303 /* Allocate private data */
AndyA 22:0dd9c1b5664a 304 priv = mem_malloc(sizeof(struct slipif_priv));
AndyA 22:0dd9c1b5664a 305 if (!priv) {
AndyA 22:0dd9c1b5664a 306 return ERR_MEM;
AndyA 22:0dd9c1b5664a 307 }
AndyA 22:0dd9c1b5664a 308
AndyA 22:0dd9c1b5664a 309 netif->name[0] = 's';
AndyA 22:0dd9c1b5664a 310 netif->name[1] = 'l';
AndyA 22:0dd9c1b5664a 311 netif->output = slipif_output;
AndyA 22:0dd9c1b5664a 312 netif->mtu = SLIP_MAX_SIZE;
AndyA 22:0dd9c1b5664a 313 netif->flags |= NETIF_FLAG_POINTTOPOINT;
AndyA 22:0dd9c1b5664a 314
AndyA 22:0dd9c1b5664a 315 /* Try to open the serial port (netif->num contains the port number). */
AndyA 22:0dd9c1b5664a 316 priv->sd = sio_open(netif->num);
AndyA 22:0dd9c1b5664a 317 if (!priv->sd) {
AndyA 22:0dd9c1b5664a 318 /* Opening the serial port failed. */
AndyA 22:0dd9c1b5664a 319 mem_free(priv);
AndyA 22:0dd9c1b5664a 320 return ERR_IF;
AndyA 22:0dd9c1b5664a 321 }
AndyA 22:0dd9c1b5664a 322
AndyA 22:0dd9c1b5664a 323 /* Initialize private data */
AndyA 22:0dd9c1b5664a 324 priv->p = NULL;
AndyA 22:0dd9c1b5664a 325 priv->q = NULL;
AndyA 22:0dd9c1b5664a 326 priv->state = SLIP_RECV_NORMAL;
AndyA 22:0dd9c1b5664a 327 priv->i = 0;
AndyA 22:0dd9c1b5664a 328 priv->recved = 0;
AndyA 22:0dd9c1b5664a 329
AndyA 22:0dd9c1b5664a 330 netif->state = priv;
AndyA 22:0dd9c1b5664a 331
AndyA 22:0dd9c1b5664a 332 /* initialize the snmp variables and counters inside the struct netif
AndyA 22:0dd9c1b5664a 333 * ifSpeed: no assumption can be made without knowing more about the
AndyA 22:0dd9c1b5664a 334 * serial line!
AndyA 22:0dd9c1b5664a 335 */
AndyA 22:0dd9c1b5664a 336 NETIF_INIT_SNMP(netif, snmp_ifType_slip, 0);
AndyA 22:0dd9c1b5664a 337
AndyA 22:0dd9c1b5664a 338 /* Create a thread to poll the serial line. */
AndyA 22:0dd9c1b5664a 339 sys_thread_new(SLIPIF_THREAD_NAME, slipif_loop_thread, netif,
AndyA 22:0dd9c1b5664a 340 SLIPIF_THREAD_STACKSIZE, SLIPIF_THREAD_PRIO);
AndyA 22:0dd9c1b5664a 341 return ERR_OK;
AndyA 22:0dd9c1b5664a 342 }
AndyA 22:0dd9c1b5664a 343
AndyA 22:0dd9c1b5664a 344 /**
AndyA 22:0dd9c1b5664a 345 * Polls the serial device and feeds the IP layer with incoming packets.
AndyA 22:0dd9c1b5664a 346 *
AndyA 22:0dd9c1b5664a 347 * @param netif The lwip network interface structure for this slipif
AndyA 22:0dd9c1b5664a 348 */
AndyA 22:0dd9c1b5664a 349 void
AndyA 22:0dd9c1b5664a 350 slipif_poll(struct netif *netif)
AndyA 22:0dd9c1b5664a 351 {
AndyA 22:0dd9c1b5664a 352 struct pbuf *p;
AndyA 22:0dd9c1b5664a 353 struct slipif_priv *priv;
AndyA 22:0dd9c1b5664a 354
AndyA 22:0dd9c1b5664a 355 LWIP_ASSERT("netif != NULL", (netif != NULL));
AndyA 22:0dd9c1b5664a 356 LWIP_ASSERT("netif->state != NULL", (netif->state != NULL));
AndyA 22:0dd9c1b5664a 357
AndyA 22:0dd9c1b5664a 358 priv = netif->state;
AndyA 22:0dd9c1b5664a 359
AndyA 22:0dd9c1b5664a 360 while ((p = slipif_input(netif, SLIP_DONTBLOCK)) != NULL) {
AndyA 22:0dd9c1b5664a 361 if (netif->input(p, netif) != ERR_OK) {
AndyA 22:0dd9c1b5664a 362 pbuf_free(p);
AndyA 22:0dd9c1b5664a 363 }
AndyA 22:0dd9c1b5664a 364 }
AndyA 22:0dd9c1b5664a 365 }
AndyA 22:0dd9c1b5664a 366
AndyA 22:0dd9c1b5664a 367 #endif /* LWIP_HAVE_SLIPIF */