[164] | 1 | /**
|
---|
| 2 | * @file
|
---|
| 3 | * SLIP Interface
|
---|
| 4 | *
|
---|
| 5 | */
|
---|
| 6 |
|
---|
| 7 | /*
|
---|
| 8 | * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
|
---|
| 9 | * All rights reserved.
|
---|
| 10 | *
|
---|
| 11 | * Redistribution and use in source and binary forms, with or without
|
---|
| 12 | * modification, are permitted provided that the following conditions
|
---|
| 13 | * are met:
|
---|
| 14 | * 1. Redistributions of source code must retain the above copyright
|
---|
| 15 | * notice, this list of conditions and the following disclaimer.
|
---|
| 16 | * 2. Redistributions in binary form must reproduce the above copyright
|
---|
| 17 | * notice, this list of conditions and the following disclaimer in the
|
---|
| 18 | * documentation and/or other materials provided with the distribution.
|
---|
| 19 | * 3. Neither the name of the Institute nor the names of its contributors
|
---|
| 20 | * may be used to endorse or promote products derived from this software
|
---|
| 21 | * without specific prior written permission.
|
---|
| 22 | *
|
---|
| 23 | * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
|
---|
| 24 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
---|
| 25 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
---|
| 26 | * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
|
---|
| 27 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
---|
| 28 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
---|
| 29 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
---|
| 30 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
---|
| 31 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
---|
| 32 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
---|
| 33 | * SUCH DAMAGE.
|
---|
| 34 | *
|
---|
| 35 | * This file is built upon the file: src/arch/rtxc/netif/sioslip.c
|
---|
| 36 | *
|
---|
| 37 | * Author: Magnus Ivarsson <magnus.ivarsson(at)volvo.com>
|
---|
| 38 | * Simon Goldschmidt
|
---|
| 39 | *
|
---|
| 40 | * Usage: This netif can be used in three ways:
|
---|
| 41 | * 1) For NO_SYS==0, an RX thread can be used which blocks on sio_read()
|
---|
| 42 | * until data is received.
|
---|
| 43 | * 2) In your main loop, call slipif_poll() to check for new RX bytes,
|
---|
| 44 | * completed packets are fed into netif->input().
|
---|
| 45 | * 3) Call slipif_received_byte[s]() from your serial RX ISR and
|
---|
| 46 | * slipif_process_rxqueue() from your main loop. ISR level decodes
|
---|
| 47 | * packets and puts completed packets on a queue which is fed into
|
---|
| 48 | * the stack from the main loop (needs SYS_LIGHTWEIGHT_PROT for
|
---|
| 49 | * pbuf_alloc to work on ISR level!).
|
---|
| 50 | *
|
---|
| 51 | */
|
---|
| 52 |
|
---|
| 53 | /*
|
---|
| 54 | * This is an arch independent SLIP netif. The specific serial hooks must be
|
---|
| 55 | * provided by another file. They are sio_open, sio_read/sio_tryread and sio_send
|
---|
| 56 | */
|
---|
| 57 |
|
---|
| 58 | #include "netif/slipif.h"
|
---|
| 59 | #include "lwip/opt.h"
|
---|
| 60 |
|
---|
| 61 | #if LWIP_HAVE_SLIPIF
|
---|
| 62 |
|
---|
| 63 | #include "lwip/def.h"
|
---|
| 64 | #include "lwip/pbuf.h"
|
---|
| 65 | #include "lwip/stats.h"
|
---|
| 66 | #include "lwip/snmp.h"
|
---|
| 67 | #include "lwip/sio.h"
|
---|
| 68 | #include "lwip/sys.h"
|
---|
| 69 |
|
---|
| 70 | #define SLIP_END 0xC0 /* 0300: start and end of every packet */
|
---|
| 71 | #define SLIP_ESC 0xDB /* 0333: escape start (one byte escaped data follows) */
|
---|
| 72 | #define SLIP_ESC_END 0xDC /* 0334: following escape: original byte is 0xC0 (END) */
|
---|
| 73 | #define SLIP_ESC_ESC 0xDD /* 0335: following escape: original byte is 0xDB (ESC) */
|
---|
| 74 |
|
---|
| 75 | /** Maximum packet size that is received by this netif */
|
---|
| 76 | #ifndef SLIP_MAX_SIZE
|
---|
| 77 | #define SLIP_MAX_SIZE 1500
|
---|
| 78 | #endif
|
---|
| 79 |
|
---|
| 80 | /** Define this to the interface speed for SNMP
|
---|
| 81 | * (sio_fd is the sio_fd_t returned by sio_open).
|
---|
| 82 | * The default value of zero means 'unknown'.
|
---|
| 83 | */
|
---|
| 84 | #ifndef SLIP_SIO_SPEED
|
---|
| 85 | #define SLIP_SIO_SPEED(sio_fd) 0
|
---|
| 86 | #endif
|
---|
| 87 |
|
---|
| 88 | enum slipif_recv_state {
|
---|
| 89 | SLIP_RECV_NORMAL,
|
---|
| 90 | SLIP_RECV_ESCAPE,
|
---|
| 91 | };
|
---|
| 92 |
|
---|
| 93 | struct slipif_priv {
|
---|
| 94 | sio_fd_t sd;
|
---|
| 95 | /* q is the whole pbuf chain for a packet, p is the current pbuf in the chain */
|
---|
| 96 | struct pbuf *p, *q;
|
---|
| 97 | u8_t state;
|
---|
| 98 | u16_t i, recved;
|
---|
| 99 | #if SLIP_RX_FROM_ISR
|
---|
| 100 | struct pbuf *rxpackets;
|
---|
| 101 | #endif
|
---|
| 102 | };
|
---|
| 103 |
|
---|
| 104 | /**
|
---|
| 105 | * Send a pbuf doing the necessary SLIP encapsulation
|
---|
| 106 | *
|
---|
| 107 | * Uses the serial layer's sio_send()
|
---|
| 108 | *
|
---|
| 109 | * @param netif the lwip network interface structure for this slipif
|
---|
| 110 | * @param p the pbuf chaing packet to send
|
---|
| 111 | * @param ipaddr the ip address to send the packet to (not used for slipif)
|
---|
| 112 | * @return always returns ERR_OK since the serial layer does not provide return values
|
---|
| 113 | */
|
---|
| 114 | err_t
|
---|
| 115 | slipif_output(struct netif *netif, struct pbuf *p, ip_addr_t *ipaddr)
|
---|
| 116 | {
|
---|
| 117 | struct slipif_priv *priv;
|
---|
| 118 | struct pbuf *q;
|
---|
| 119 | u16_t i;
|
---|
| 120 | u8_t c;
|
---|
| 121 |
|
---|
| 122 | LWIP_ASSERT("netif != NULL", (netif != NULL));
|
---|
| 123 | LWIP_ASSERT("netif->state != NULL", (netif->state != NULL));
|
---|
| 124 | LWIP_ASSERT("p != NULL", (p != NULL));
|
---|
| 125 |
|
---|
| 126 | LWIP_UNUSED_ARG(ipaddr);
|
---|
| 127 |
|
---|
| 128 | LWIP_DEBUGF(SLIP_DEBUG, ("slipif_output(%"U16_F"): sending %"U16_F" bytes\n", (u16_t)netif->num, p->tot_len));
|
---|
| 129 | priv = netif->state;
|
---|
| 130 |
|
---|
| 131 | /* Send pbuf out on the serial I/O device. */
|
---|
| 132 | /* Start with packet delimiter. */
|
---|
| 133 | sio_send(SLIP_END, priv->sd);
|
---|
| 134 |
|
---|
| 135 | for (q = p; q != NULL; q = q->next) {
|
---|
| 136 | for (i = 0; i < q->len; i++) {
|
---|
| 137 | c = ((u8_t *)q->payload)[i];
|
---|
| 138 | switch (c) {
|
---|
| 139 | case SLIP_END:
|
---|
| 140 | /* need to escape this byte (0xC0 -> 0xDB, 0xDC) */
|
---|
| 141 | sio_send(SLIP_ESC, priv->sd);
|
---|
| 142 | sio_send(SLIP_ESC_END, priv->sd);
|
---|
| 143 | break;
|
---|
| 144 | case SLIP_ESC:
|
---|
| 145 | /* need to escape this byte (0xDB -> 0xDB, 0xDD) */
|
---|
| 146 | sio_send(SLIP_ESC, priv->sd);
|
---|
| 147 | sio_send(SLIP_ESC_ESC, priv->sd);
|
---|
| 148 | break;
|
---|
| 149 | default:
|
---|
| 150 | /* normal byte - no need for escaping */
|
---|
| 151 | sio_send(c, priv->sd);
|
---|
| 152 | break;
|
---|
| 153 | }
|
---|
| 154 | }
|
---|
| 155 | }
|
---|
| 156 | /* End with packet delimiter. */
|
---|
| 157 | sio_send(SLIP_END, priv->sd);
|
---|
| 158 | return ERR_OK;
|
---|
| 159 | }
|
---|
| 160 |
|
---|
| 161 | /**
|
---|
| 162 | * Handle the incoming SLIP stream character by character
|
---|
| 163 | *
|
---|
| 164 | * @param netif the lwip network interface structure for this slipif
|
---|
| 165 | * @param c received character (multiple calls to this function will
|
---|
| 166 | * return a complete packet, NULL is returned before - used for polling)
|
---|
| 167 | * @return The IP packet when SLIP_END is received
|
---|
| 168 | */
|
---|
| 169 | static struct pbuf*
|
---|
| 170 | slipif_rxbyte(struct netif *netif, u8_t c)
|
---|
| 171 | {
|
---|
| 172 | struct slipif_priv *priv;
|
---|
| 173 | struct pbuf *t;
|
---|
| 174 |
|
---|
| 175 | LWIP_ASSERT("netif != NULL", (netif != NULL));
|
---|
| 176 | LWIP_ASSERT("netif->state != NULL", (netif->state != NULL));
|
---|
| 177 |
|
---|
| 178 | priv = netif->state;
|
---|
| 179 |
|
---|
| 180 | switch (priv->state) {
|
---|
| 181 | case SLIP_RECV_NORMAL:
|
---|
| 182 | switch (c) {
|
---|
| 183 | case SLIP_END:
|
---|
| 184 | if (priv->recved > 0) {
|
---|
| 185 | /* Received whole packet. */
|
---|
| 186 | /* Trim the pbuf to the size of the received packet. */
|
---|
| 187 | pbuf_realloc(priv->q, priv->recved);
|
---|
| 188 |
|
---|
| 189 | LINK_STATS_INC(link.recv);
|
---|
| 190 |
|
---|
| 191 | LWIP_DEBUGF(SLIP_DEBUG, ("slipif: Got packet (%"U16_F" bytes)\n", priv->recved));
|
---|
| 192 | t = priv->q;
|
---|
| 193 | priv->p = priv->q = NULL;
|
---|
| 194 | priv->i = priv->recved = 0;
|
---|
| 195 | return t;
|
---|
| 196 | }
|
---|
| 197 | return NULL;
|
---|
| 198 | case SLIP_ESC:
|
---|
| 199 | priv->state = SLIP_RECV_ESCAPE;
|
---|
| 200 | return NULL;
|
---|
| 201 | } /* end switch (c) */
|
---|
| 202 | break;
|
---|
| 203 | case SLIP_RECV_ESCAPE:
|
---|
| 204 | /* un-escape END or ESC bytes, leave other bytes
|
---|
| 205 | (although that would be a protocol error) */
|
---|
| 206 | switch (c) {
|
---|
| 207 | case SLIP_ESC_END:
|
---|
| 208 | c = SLIP_END;
|
---|
| 209 | break;
|
---|
| 210 | case SLIP_ESC_ESC:
|
---|
| 211 | c = SLIP_ESC;
|
---|
| 212 | break;
|
---|
| 213 | }
|
---|
| 214 | priv->state = SLIP_RECV_NORMAL;
|
---|
| 215 | break;
|
---|
| 216 | } /* end switch (priv->state) */
|
---|
| 217 |
|
---|
| 218 | /* byte received, packet not yet completely received */
|
---|
| 219 | if (priv->p == NULL) {
|
---|
| 220 | /* allocate a new pbuf */
|
---|
| 221 | LWIP_DEBUGF(SLIP_DEBUG, ("slipif_input: alloc\n"));
|
---|
| 222 | priv->p = pbuf_alloc(PBUF_LINK, (PBUF_POOL_BUFSIZE - PBUF_LINK_HLEN), PBUF_POOL);
|
---|
| 223 |
|
---|
| 224 | if (priv->p == NULL) {
|
---|
| 225 | LINK_STATS_INC(link.drop);
|
---|
| 226 | LWIP_DEBUGF(SLIP_DEBUG, ("slipif_input: no new pbuf! (DROP)\n"));
|
---|
| 227 | /* don't process any further since we got no pbuf to receive to */
|
---|
| 228 | return NULL;
|
---|
| 229 | }
|
---|
| 230 |
|
---|
| 231 | if (priv->q != NULL) {
|
---|
| 232 | /* 'chain' the pbuf to the existing chain */
|
---|
| 233 | pbuf_cat(priv->q, priv->p);
|
---|
| 234 | } else {
|
---|
| 235 | /* p is the first pbuf in the chain */
|
---|
| 236 | priv->q = priv->p;
|
---|
| 237 | }
|
---|
| 238 | }
|
---|
| 239 |
|
---|
| 240 | /* this automatically drops bytes if > SLIP_MAX_SIZE */
|
---|
| 241 | if ((priv->p != NULL) && (priv->recved <= SLIP_MAX_SIZE)) {
|
---|
| 242 | ((u8_t *)priv->p->payload)[priv->i] = c;
|
---|
| 243 | priv->recved++;
|
---|
| 244 | priv->i++;
|
---|
| 245 | if (priv->i >= priv->p->len) {
|
---|
| 246 | /* on to the next pbuf */
|
---|
| 247 | priv->i = 0;
|
---|
| 248 | if (priv->p->next != NULL && priv->p->next->len > 0) {
|
---|
| 249 | /* p is a chain, on to the next in the chain */
|
---|
| 250 | priv->p = priv->p->next;
|
---|
| 251 | } else {
|
---|
| 252 | /* p is a single pbuf, set it to NULL so next time a new
|
---|
| 253 | * pbuf is allocated */
|
---|
| 254 | priv->p = NULL;
|
---|
| 255 | }
|
---|
| 256 | }
|
---|
| 257 | }
|
---|
| 258 | return NULL;
|
---|
| 259 | }
|
---|
| 260 |
|
---|
| 261 | /** Like slipif_rxbyte, but passes completed packets to netif->input
|
---|
| 262 | *
|
---|
| 263 | * @param netif The lwip network interface structure for this slipif
|
---|
| 264 | * @param data received character
|
---|
| 265 | */
|
---|
| 266 | static void
|
---|
| 267 | slipif_rxbyte_input(struct netif *netif, u8_t c)
|
---|
| 268 | {
|
---|
| 269 | struct pbuf *p;
|
---|
| 270 | p = slipif_rxbyte(netif, c);
|
---|
| 271 | if (p != NULL) {
|
---|
| 272 | if (netif->input(p, netif) != ERR_OK) {
|
---|
| 273 | pbuf_free(p);
|
---|
| 274 | }
|
---|
| 275 | }
|
---|
| 276 | }
|
---|
| 277 |
|
---|
| 278 | #if SLIP_USE_RX_THREAD
|
---|
| 279 | /**
|
---|
| 280 | * The SLIP input thread.
|
---|
| 281 | *
|
---|
| 282 | * Feed the IP layer with incoming packets
|
---|
| 283 | *
|
---|
| 284 | * @param nf the lwip network interface structure for this slipif
|
---|
| 285 | */
|
---|
| 286 | static void
|
---|
| 287 | slipif_loop_thread(void *nf)
|
---|
| 288 | {
|
---|
| 289 | u8_t c;
|
---|
| 290 | struct netif *netif = (struct netif *)nf;
|
---|
| 291 | struct slipif_priv *priv = (struct slipif_priv *)netif->state;
|
---|
| 292 |
|
---|
| 293 | while (1) {
|
---|
| 294 | if (sio_read(priv->sd, &c, 1) > 0) {
|
---|
| 295 | slipif_rxbyte_input(netif, c);
|
---|
| 296 | }
|
---|
| 297 | }
|
---|
| 298 | }
|
---|
| 299 | #endif /* SLIP_USE_RX_THREAD */
|
---|
| 300 |
|
---|
| 301 | /**
|
---|
| 302 | * SLIP netif initialization
|
---|
| 303 | *
|
---|
| 304 | * Call the arch specific sio_open and remember
|
---|
| 305 | * the opened device in the state field of the netif.
|
---|
| 306 | *
|
---|
| 307 | * @param netif the lwip network interface structure for this slipif
|
---|
| 308 | * @return ERR_OK if serial line could be opened,
|
---|
| 309 | * ERR_MEM if no memory could be allocated,
|
---|
| 310 | * ERR_IF is serial line couldn't be opened
|
---|
| 311 | *
|
---|
| 312 | * @note netif->num must contain the number of the serial port to open
|
---|
| 313 | * (0 by default). If netif->state is != NULL, it is interpreted as an
|
---|
| 314 | * u8_t pointer pointing to the serial port number instead of netif->num.
|
---|
| 315 | *
|
---|
| 316 | */
|
---|
| 317 | err_t
|
---|
| 318 | slipif_init(struct netif *netif)
|
---|
| 319 | {
|
---|
| 320 | struct slipif_priv *priv;
|
---|
| 321 | u8_t sio_num;
|
---|
| 322 |
|
---|
| 323 | LWIP_DEBUGF(SLIP_DEBUG, ("slipif_init: netif->num=%"U16_F"\n", (u16_t)netif->num));
|
---|
| 324 |
|
---|
| 325 | /* Allocate private data */
|
---|
| 326 | priv = (struct slipif_priv *)mem_malloc(sizeof(struct slipif_priv));
|
---|
| 327 | if (!priv) {
|
---|
| 328 | return ERR_MEM;
|
---|
| 329 | }
|
---|
| 330 |
|
---|
| 331 | netif->name[0] = 's';
|
---|
| 332 | netif->name[1] = 'l';
|
---|
| 333 | netif->output = slipif_output;
|
---|
| 334 | netif->mtu = SLIP_MAX_SIZE;
|
---|
| 335 | netif->flags |= NETIF_FLAG_POINTTOPOINT;
|
---|
| 336 |
|
---|
| 337 | /* netif->state or netif->num contain the port number */
|
---|
| 338 | if (netif->state != NULL) {
|
---|
| 339 | sio_num = *(u8_t*)netif->state;
|
---|
| 340 | } else {
|
---|
| 341 | sio_num = netif->num;
|
---|
| 342 | }
|
---|
| 343 | /* Try to open the serial port. */
|
---|
| 344 | priv->sd = sio_open(sio_num);
|
---|
| 345 | if (!priv->sd) {
|
---|
| 346 | /* Opening the serial port failed. */
|
---|
| 347 | mem_free(priv);
|
---|
| 348 | return ERR_IF;
|
---|
| 349 | }
|
---|
| 350 |
|
---|
| 351 | /* Initialize private data */
|
---|
| 352 | priv->p = NULL;
|
---|
| 353 | priv->q = NULL;
|
---|
| 354 | priv->state = SLIP_RECV_NORMAL;
|
---|
| 355 | priv->i = 0;
|
---|
| 356 | priv->recved = 0;
|
---|
| 357 | #if SLIP_RX_FROM_ISR
|
---|
| 358 | priv->rxpackets = NULL;
|
---|
| 359 | #endif
|
---|
| 360 |
|
---|
| 361 | netif->state = priv;
|
---|
| 362 |
|
---|
| 363 | /* initialize the snmp variables and counters inside the struct netif */
|
---|
| 364 | NETIF_INIT_SNMP(netif, snmp_ifType_slip, SLIP_SIO_SPEED(priv->sd));
|
---|
| 365 |
|
---|
| 366 | #if SLIP_USE_RX_THREAD
|
---|
| 367 | /* Create a thread to poll the serial line. */
|
---|
| 368 | sys_thread_new(SLIPIF_THREAD_NAME, slipif_loop_thread, netif,
|
---|
| 369 | SLIPIF_THREAD_STACKSIZE, SLIPIF_THREAD_PRIO);
|
---|
| 370 | #endif /* SLIP_USE_RX_THREAD */
|
---|
| 371 | return ERR_OK;
|
---|
| 372 | }
|
---|
| 373 |
|
---|
| 374 | /**
|
---|
| 375 | * Polls the serial device and feeds the IP layer with incoming packets.
|
---|
| 376 | *
|
---|
| 377 | * @param netif The lwip network interface structure for this slipif
|
---|
| 378 | */
|
---|
| 379 | void
|
---|
| 380 | slipif_poll(struct netif *netif)
|
---|
| 381 | {
|
---|
| 382 | u8_t c;
|
---|
| 383 | struct slipif_priv *priv;
|
---|
| 384 |
|
---|
| 385 | LWIP_ASSERT("netif != NULL", (netif != NULL));
|
---|
| 386 | LWIP_ASSERT("netif->state != NULL", (netif->state != NULL));
|
---|
| 387 |
|
---|
| 388 | priv = (struct slipif_priv *)netif->state;
|
---|
| 389 |
|
---|
| 390 | while (sio_tryread(priv->sd, &c, 1) > 0) {
|
---|
| 391 | slipif_rxbyte_input(netif, c);
|
---|
| 392 | }
|
---|
| 393 | }
|
---|
| 394 |
|
---|
| 395 | #if SLIP_RX_FROM_ISR
|
---|
| 396 | /**
|
---|
| 397 | * Feeds the IP layer with incoming packets that were receive
|
---|
| 398 | *
|
---|
| 399 | * @param netif The lwip network interface structure for this slipif
|
---|
| 400 | */
|
---|
| 401 | void
|
---|
| 402 | slipif_process_rxqueue(struct netif *netif)
|
---|
| 403 | {
|
---|
| 404 | struct slipif_priv *priv;
|
---|
| 405 | SYS_ARCH_DECL_PROTECT(old_level);
|
---|
| 406 |
|
---|
| 407 | LWIP_ASSERT("netif != NULL", (netif != NULL));
|
---|
| 408 | LWIP_ASSERT("netif->state != NULL", (netif->state != NULL));
|
---|
| 409 |
|
---|
| 410 | priv = (struct slipif_priv *)netif->state;
|
---|
| 411 |
|
---|
| 412 | SYS_ARCH_PROTECT(old_level);
|
---|
| 413 | while (priv->rxpackets != NULL) {
|
---|
| 414 | struct pbuf *p = priv->rxpackets;
|
---|
| 415 | #if SLIP_RX_QUEUE
|
---|
| 416 | /* dequeue packet */
|
---|
| 417 | struct pbuf *q = p;
|
---|
| 418 | while ((q->len != q->tot_len) && (q->next != NULL)) {
|
---|
| 419 | q = q->next;
|
---|
| 420 | }
|
---|
| 421 | priv->rxpackets = q->next;
|
---|
| 422 | q->next = NULL;
|
---|
| 423 | #else /* SLIP_RX_QUEUE */
|
---|
| 424 | priv->rxpackets = NULL;
|
---|
| 425 | #endif /* SLIP_RX_QUEUE */
|
---|
| 426 | SYS_ARCH_UNPROTECT(old_level);
|
---|
| 427 | if (netif->input(p, netif) != ERR_OK) {
|
---|
| 428 | pbuf_free(p);
|
---|
| 429 | }
|
---|
| 430 | SYS_ARCH_PROTECT(old_level);
|
---|
| 431 | }
|
---|
| 432 | }
|
---|
| 433 |
|
---|
| 434 | /** Like slipif_rxbyte, but queues completed packets.
|
---|
| 435 | *
|
---|
| 436 | * @param netif The lwip network interface structure for this slipif
|
---|
| 437 | * @param data Received serial byte
|
---|
| 438 | */
|
---|
| 439 | static void
|
---|
| 440 | slipif_rxbyte_enqueue(struct netif *netif, u8_t data)
|
---|
| 441 | {
|
---|
| 442 | struct pbuf *p;
|
---|
| 443 | struct slipif_priv *priv = (struct slipif_priv *)netif->state;
|
---|
| 444 | SYS_ARCH_DECL_PROTECT(old_level);
|
---|
| 445 |
|
---|
| 446 | p = slipif_rxbyte(netif, data);
|
---|
| 447 | if (p != NULL) {
|
---|
| 448 | SYS_ARCH_PROTECT(old_level);
|
---|
| 449 | if (priv->rxpackets != NULL) {
|
---|
| 450 | #if SLIP_RX_QUEUE
|
---|
| 451 | /* queue multiple pbufs */
|
---|
| 452 | struct pbuf *q = p;
|
---|
| 453 | while(q->next != NULL) {
|
---|
| 454 | q = q->next;
|
---|
| 455 | }
|
---|
| 456 | q->next = p;
|
---|
| 457 | } else {
|
---|
| 458 | #else /* SLIP_RX_QUEUE */
|
---|
| 459 | pbuf_free(priv->rxpackets);
|
---|
| 460 | }
|
---|
| 461 | {
|
---|
| 462 | #endif /* SLIP_RX_QUEUE */
|
---|
| 463 | priv->rxpackets = p;
|
---|
| 464 | }
|
---|
| 465 | SYS_ARCH_UNPROTECT(old_level);
|
---|
| 466 | }
|
---|
| 467 | }
|
---|
| 468 |
|
---|
| 469 | /**
|
---|
| 470 | * Process a received byte, completed packets are put on a queue that is
|
---|
| 471 | * fed into IP through slipif_process_rxqueue().
|
---|
| 472 | *
|
---|
| 473 | * This function can be called from ISR if SYS_LIGHTWEIGHT_PROT is enabled.
|
---|
| 474 | *
|
---|
| 475 | * @param netif The lwip network interface structure for this slipif
|
---|
| 476 | * @param data received character
|
---|
| 477 | */
|
---|
| 478 | void
|
---|
| 479 | slipif_received_byte(struct netif *netif, u8_t data)
|
---|
| 480 | {
|
---|
| 481 | LWIP_ASSERT("netif != NULL", (netif != NULL));
|
---|
| 482 | LWIP_ASSERT("netif->state != NULL", (netif->state != NULL));
|
---|
| 483 | slipif_rxbyte_enqueue(netif, data);
|
---|
| 484 | }
|
---|
| 485 |
|
---|
| 486 | /**
|
---|
| 487 | * Process multiple received byte, completed packets are put on a queue that is
|
---|
| 488 | * fed into IP through slipif_process_rxqueue().
|
---|
| 489 | *
|
---|
| 490 | * This function can be called from ISR if SYS_LIGHTWEIGHT_PROT is enabled.
|
---|
| 491 | *
|
---|
| 492 | * @param netif The lwip network interface structure for this slipif
|
---|
| 493 | * @param data received character
|
---|
| 494 | * @param len Number of received characters
|
---|
| 495 | */
|
---|
| 496 | void
|
---|
| 497 | slipif_received_bytes(struct netif *netif, u8_t *data, u8_t len)
|
---|
| 498 | {
|
---|
| 499 | u8_t i;
|
---|
| 500 | u8_t *rxdata = data;
|
---|
| 501 | LWIP_ASSERT("netif != NULL", (netif != NULL));
|
---|
| 502 | LWIP_ASSERT("netif->state != NULL", (netif->state != NULL));
|
---|
| 503 |
|
---|
| 504 | for (i = 0; i < len; i++, rxdata++) {
|
---|
| 505 | slipif_rxbyte_enqueue(netif, *rxdata);
|
---|
| 506 | }
|
---|
| 507 | }
|
---|
| 508 | #endif /* SLIP_RX_FROM_ISR */
|
---|
| 509 |
|
---|
| 510 | #endif /* LWIP_HAVE_SLIPIF */
|
---|