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[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Demo/] [lwIP_MCF5235_GCC/] [lwip/] [src/] [netif/] [slipif.c] - Rev 609
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/* * Copyright (c) 2001-2004 Swedish Institute of Computer Science. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the Institute nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * This file is built upon the file: src/arch/rtxc/netif/sioslip.c * * Author: Magnus Ivarsson <magnus.ivarsson(at)volvo.com> */ /* * This is an arch independent SLIP netif. The specific serial hooks must be * provided by another file. They are sio_open, sio_recv and sio_send */ #include "netif/slipif.h" #include "lwip/opt.h" #include "lwip/def.h" #include "lwip/pbuf.h" #include "lwip/sys.h" #include "lwip/stats.h" #include "lwip/sio.h" #define SLIP_END 0300 #define SLIP_ESC 0333 #define SLIP_ESC_END 0334 #define SLIP_ESC_ESC 0335 #define MAX_SIZE 1500 /** * Send a pbuf doing the necessary SLIP encapsulation * * Uses the serial layer's sio_send() */ err_t slipif_output(struct netif *netif, struct pbuf *p, struct ip_addr *ipaddr) { struct pbuf *q; u16_t i; u8_t c; /* Send pbuf out on the serial I/O device. */ sio_send(SLIP_END, netif->state); for (q = p; q != NULL; q = q->next) { for (i = 0; i < q->len; i++) { c = ((u8_t *)q->payload)[i]; switch (c) { case SLIP_END: sio_send(SLIP_ESC, netif->state); sio_send(SLIP_ESC_END, netif->state); break; case SLIP_ESC: sio_send(SLIP_ESC, netif->state); sio_send(SLIP_ESC_ESC, netif->state); break; default: sio_send(c, netif->state); break; } } } sio_send(SLIP_END, netif->state); return 0; } /** * Handle the incoming SLIP stream character by character * * Poll the serial layer by calling sio_recv() * * @return The IP packet when SLIP_END is received */ static struct pbuf * slipif_input(struct netif *netif) { u8_t c; struct pbuf *p, *q; u16_t recved; u16_t i; q = p = NULL; recved = i = 0; c = 0; while (1) { c = sio_recv(netif->state); switch (c) { case SLIP_END: if (recved > 0) { /* Received whole packet. */ pbuf_realloc(q, recved); LINK_STATS_INC(link.recv); LWIP_DEBUGF(SLIP_DEBUG, ("slipif: Got packet\n")); return q; } break; case SLIP_ESC: c = sio_recv(netif->state); switch (c) { case SLIP_ESC_END: c = SLIP_END; break; case SLIP_ESC_ESC: c = SLIP_ESC; break; } /* FALLTHROUGH */ default: if (p == NULL) { LWIP_DEBUGF(SLIP_DEBUG, ("slipif_input: alloc\n")); p = pbuf_alloc(PBUF_LINK, PBUF_POOL_BUFSIZE, PBUF_POOL); if (p == NULL) { LINK_STATS_INC(link.drop); LWIP_DEBUGF(SLIP_DEBUG, ("slipif_input: no new pbuf! (DROP)\n")); } if (q != NULL) { pbuf_cat(q, p); } else { q = p; } } if (p != NULL && recved < MAX_SIZE) { ((u8_t *)p->payload)[i] = c; recved++; i++; if (i >= p->len) { i = 0; if (p->next != NULL && p->next->len > 0) p = p->next; else p = NULL; } } break; } } return NULL; } /** * The SLIP input thread. * * Feed the IP layer with incoming packets */ static void slipif_loop(void *nf) { struct pbuf *p; struct netif *netif = (struct netif *)nf; while (1) { p = slipif_input(netif); netif->input(p, netif); } } /** * SLIP netif initialization * * Call the arch specific sio_open and remember * the opened device in the state field of the netif. */ err_t slipif_init(struct netif *netif) { LWIP_DEBUGF(SLIP_DEBUG, ("slipif_init: netif->num=%"U16_F"\n", (u16_t)netif->num)); netif->name[0] = 's'; netif->name[1] = 'l'; netif->output = slipif_output; netif->mtu = 1500; netif->flags = NETIF_FLAG_POINTTOPOINT; netif->state = sio_open(netif->num); if (!netif->state) return ERR_IF; sys_thread_new(slipif_loop, netif, SLIPIF_THREAD_PRIO); return ERR_OK; }
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