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lwip/netif/slipif.c@3:0c324737064d, 2010-11-09 (annotated)

Committer:: mbed714
Date:: Tue Nov 09 19:32:44 2010 +0000
Revision:: 3:0c324737064d
Parent:: 0:98aadd37a5c5

Who changed what in which revision?

User	Revision	Line number	New contents of line
mbed714	0:98aadd37a5c5	1	/**
mbed714	0:98aadd37a5c5	2	* @file
mbed714	0:98aadd37a5c5	3	* SLIP Interface
mbed714	0:98aadd37a5c5	4	*
mbed714	0:98aadd37a5c5	5	*/
mbed714	0:98aadd37a5c5	6
mbed714	0:98aadd37a5c5	7	/*
mbed714	0:98aadd37a5c5	8	* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
mbed714	0:98aadd37a5c5	9	* All rights reserved.
mbed714	0:98aadd37a5c5	10	*
mbed714	0:98aadd37a5c5	11	* Redistribution and use in source and binary forms, with or without
mbed714	0:98aadd37a5c5	12	* modification, are permitted provided that the following conditions
mbed714	0:98aadd37a5c5	13	* are met:
mbed714	0:98aadd37a5c5	14	* 1. Redistributions of source code must retain the above copyright
mbed714	0:98aadd37a5c5	15	* notice, this list of conditions and the following disclaimer.
mbed714	0:98aadd37a5c5	16	* 2. Redistributions in binary form must reproduce the above copyright
mbed714	0:98aadd37a5c5	17	* notice, this list of conditions and the following disclaimer in the
mbed714	0:98aadd37a5c5	18	* documentation and/or other materials provided with the distribution.
mbed714	0:98aadd37a5c5	19	* 3. Neither the name of the Institute nor the names of its contributors
mbed714	0:98aadd37a5c5	20	* may be used to endorse or promote products derived from this software
mbed714	0:98aadd37a5c5	21	* without specific prior written permission.
mbed714	0:98aadd37a5c5	22	*
mbed714	0:98aadd37a5c5	23	* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
mbed714	0:98aadd37a5c5	24	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed714	0:98aadd37a5c5	25	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
mbed714	0:98aadd37a5c5	26	* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
mbed714	0:98aadd37a5c5	27	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed714	0:98aadd37a5c5	28	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
mbed714	0:98aadd37a5c5	29	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
mbed714	0:98aadd37a5c5	30	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
mbed714	0:98aadd37a5c5	31	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
mbed714	0:98aadd37a5c5	32	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
mbed714	0:98aadd37a5c5	33	* SUCH DAMAGE.
mbed714	0:98aadd37a5c5	34	*
mbed714	0:98aadd37a5c5	35	* This file is built upon the file: src/arch/rtxc/netif/sioslip.c
mbed714	0:98aadd37a5c5	36	*
mbed714	0:98aadd37a5c5	37	* Author: Magnus Ivarsson <magnus.ivarsson(at)volvo.com>
mbed714	0:98aadd37a5c5	38	*/
mbed714	0:98aadd37a5c5	39
mbed714	0:98aadd37a5c5	40	/*
mbed714	0:98aadd37a5c5	41	* This is an arch independent SLIP netif. The specific serial hooks must be
mbed714	0:98aadd37a5c5	42	* provided by another file. They are sio_open, sio_read/sio_tryread and sio_send
mbed714	0:98aadd37a5c5	43	*/
mbed714	0:98aadd37a5c5	44
mbed714	0:98aadd37a5c5	45	#include "netif/slipif.h"
mbed714	0:98aadd37a5c5	46	#include "lwip/opt.h"
mbed714	0:98aadd37a5c5	47
mbed714	0:98aadd37a5c5	48	#if LWIP_HAVE_SLIPIF
mbed714	0:98aadd37a5c5	49
mbed714	0:98aadd37a5c5	50	#include "lwip/def.h"
mbed714	0:98aadd37a5c5	51	#include "lwip/pbuf.h"
mbed714	0:98aadd37a5c5	52	#include "lwip/sys.h"
mbed714	0:98aadd37a5c5	53	#include "lwip/stats.h"
mbed714	0:98aadd37a5c5	54	#include "lwip/snmp.h"
mbed714	0:98aadd37a5c5	55	#include "lwip/sio.h"
mbed714	0:98aadd37a5c5	56
mbed714	0:98aadd37a5c5	57	#define SLIP_BLOCK 1
mbed714	0:98aadd37a5c5	58	#define SLIP_DONTBLOCK 0
mbed714	0:98aadd37a5c5	59
mbed714	0:98aadd37a5c5	60	#define SLIP_END 0300 /* 0xC0 */
mbed714	0:98aadd37a5c5	61	#define SLIP_ESC 0333 /* 0xDB */
mbed714	0:98aadd37a5c5	62	#define SLIP_ESC_END 0334 /* 0xDC */
mbed714	0:98aadd37a5c5	63	#define SLIP_ESC_ESC 0335 /* 0xDD */
mbed714	0:98aadd37a5c5	64
mbed714	0:98aadd37a5c5	65	#define SLIP_MAX_SIZE 1500
mbed714	0:98aadd37a5c5	66
mbed714	0:98aadd37a5c5	67	enum slipif_recv_state {
mbed714	0:98aadd37a5c5	68	SLIP_RECV_NORMAL,
mbed714	0:98aadd37a5c5	69	SLIP_RECV_ESCAPE,
mbed714	0:98aadd37a5c5	70	};
mbed714	0:98aadd37a5c5	71
mbed714	0:98aadd37a5c5	72	struct slipif_priv {
mbed714	0:98aadd37a5c5	73	sio_fd_t sd;
mbed714	0:98aadd37a5c5	74	/* q is the whole pbuf chain for a packet, p is the current pbuf in the chain */
mbed714	0:98aadd37a5c5	75	struct pbuf p, q;
mbed714	0:98aadd37a5c5	76	enum slipif_recv_state state;
mbed714	0:98aadd37a5c5	77	u16_t i, recved;
mbed714	0:98aadd37a5c5	78	};
mbed714	0:98aadd37a5c5	79
mbed714	0:98aadd37a5c5	80	/**
mbed714	0:98aadd37a5c5	81	* Send a pbuf doing the necessary SLIP encapsulation
mbed714	0:98aadd37a5c5	82	*
mbed714	0:98aadd37a5c5	83	* Uses the serial layer's sio_send()
mbed714	0:98aadd37a5c5	84	*
mbed714	0:98aadd37a5c5	85	* @param netif the lwip network interface structure for this slipif
mbed714	0:98aadd37a5c5	86	* @param p the pbuf chaing packet to send
mbed714	0:98aadd37a5c5	87	* @param ipaddr the ip address to send the packet to (not used for slipif)
mbed714	0:98aadd37a5c5	88	* @return always returns ERR_OK since the serial layer does not provide return values
mbed714	0:98aadd37a5c5	89	*/
mbed714	0:98aadd37a5c5	90	err_t
mbed714	0:98aadd37a5c5	91	slipif_output(struct netif netif, struct pbuf p, ip_addr_t *ipaddr)
mbed714	0:98aadd37a5c5	92	{
mbed714	0:98aadd37a5c5	93	struct slipif_priv *priv;
mbed714	0:98aadd37a5c5	94	struct pbuf *q;
mbed714	0:98aadd37a5c5	95	u16_t i;
mbed714	0:98aadd37a5c5	96	u8_t c;
mbed714	0:98aadd37a5c5	97
mbed714	0:98aadd37a5c5	98	LWIP_ASSERT("netif != NULL", (netif != NULL));
mbed714	0:98aadd37a5c5	99	LWIP_ASSERT("netif->state != NULL", (netif->state != NULL));
mbed714	0:98aadd37a5c5	100	LWIP_ASSERT("p != NULL", (p != NULL));
mbed714	0:98aadd37a5c5	101
mbed714	0:98aadd37a5c5	102	LWIP_UNUSED_ARG(ipaddr);
mbed714	0:98aadd37a5c5	103
mbed714	0:98aadd37a5c5	104	priv = netif->state;
mbed714	0:98aadd37a5c5	105
mbed714	0:98aadd37a5c5	106	/* Send pbuf out on the serial I/O device. */
mbed714	0:98aadd37a5c5	107	sio_send(SLIP_END, priv->sd);
mbed714	0:98aadd37a5c5	108
mbed714	0:98aadd37a5c5	109	for (q = p; q != NULL; q = q->next) {
mbed714	0:98aadd37a5c5	110	for (i = 0; i < q->len; i++) {
mbed714	0:98aadd37a5c5	111	c = ((u8_t *)q->payload)[i];
mbed714	0:98aadd37a5c5	112	switch (c) {
mbed714	0:98aadd37a5c5	113	case SLIP_END:
mbed714	0:98aadd37a5c5	114	sio_send(SLIP_ESC, priv->sd);
mbed714	0:98aadd37a5c5	115	sio_send(SLIP_ESC_END, priv->sd);
mbed714	0:98aadd37a5c5	116	break;
mbed714	0:98aadd37a5c5	117	case SLIP_ESC:
mbed714	0:98aadd37a5c5	118	sio_send(SLIP_ESC, priv->sd);
mbed714	0:98aadd37a5c5	119	sio_send(SLIP_ESC_ESC, priv->sd);
mbed714	0:98aadd37a5c5	120	break;
mbed714	0:98aadd37a5c5	121	default:
mbed714	0:98aadd37a5c5	122	sio_send(c, priv->sd);
mbed714	0:98aadd37a5c5	123	break;
mbed714	0:98aadd37a5c5	124	}
mbed714	0:98aadd37a5c5	125	}
mbed714	0:98aadd37a5c5	126	}
mbed714	0:98aadd37a5c5	127	sio_send(SLIP_END, priv->sd);
mbed714	0:98aadd37a5c5	128	return ERR_OK;
mbed714	0:98aadd37a5c5	129	}
mbed714	0:98aadd37a5c5	130
mbed714	0:98aadd37a5c5	131	/**
mbed714	0:98aadd37a5c5	132	* Static function for easy use of blockig or non-blocking
mbed714	0:98aadd37a5c5	133	* sio_read
mbed714	0:98aadd37a5c5	134	*
mbed714	0:98aadd37a5c5	135	* @param fd serial device handle
mbed714	0:98aadd37a5c5	136	* @param data pointer to data buffer for receiving
mbed714	0:98aadd37a5c5	137	* @param len maximum length (in bytes) of data to receive
mbed714	0:98aadd37a5c5	138	* @param block if 1, call sio_read; if 0, call sio_tryread
mbed714	0:98aadd37a5c5	139	* @return return value of sio_read of sio_tryread
mbed714	0:98aadd37a5c5	140	*/
mbed714	0:98aadd37a5c5	141	static u32_t
mbed714	0:98aadd37a5c5	142	slip_sio_read(sio_fd_t fd, u8_t* data, u32_t len, u8_t block)
mbed714	0:98aadd37a5c5	143	{
mbed714	0:98aadd37a5c5	144	if (block) {
mbed714	0:98aadd37a5c5	145	return sio_read(fd, data, len);
mbed714	0:98aadd37a5c5	146	} else {
mbed714	0:98aadd37a5c5	147	return sio_tryread(fd, data, len);
mbed714	0:98aadd37a5c5	148	}
mbed714	0:98aadd37a5c5	149	}
mbed714	0:98aadd37a5c5	150
mbed714	0:98aadd37a5c5	151	/**
mbed714	0:98aadd37a5c5	152	* Handle the incoming SLIP stream character by character
mbed714	0:98aadd37a5c5	153	*
mbed714	0:98aadd37a5c5	154	* Poll the serial layer by calling sio_read() or sio_tryread().
mbed714	0:98aadd37a5c5	155	*
mbed714	0:98aadd37a5c5	156	* @param netif the lwip network interface structure for this slipif
mbed714	0:98aadd37a5c5	157	* @param block if 1, block until data is received; if 0, return when all data
mbed714	0:98aadd37a5c5	158	* from the buffer is received (multiple calls to this function will
mbed714	0:98aadd37a5c5	159	* return a complete packet, NULL is returned before - used for polling)
mbed714	0:98aadd37a5c5	160	* @return The IP packet when SLIP_END is received
mbed714	0:98aadd37a5c5	161	*/
mbed714	0:98aadd37a5c5	162	static struct pbuf *
mbed714	0:98aadd37a5c5	163	slipif_input(struct netif *netif, u8_t block)
mbed714	0:98aadd37a5c5	164	{
mbed714	0:98aadd37a5c5	165	struct slipif_priv *priv;
mbed714	0:98aadd37a5c5	166	u8_t c;
mbed714	0:98aadd37a5c5	167	struct pbuf *t;
mbed714	0:98aadd37a5c5	168
mbed714	0:98aadd37a5c5	169	LWIP_ASSERT("netif != NULL", (netif != NULL));
mbed714	0:98aadd37a5c5	170	LWIP_ASSERT("netif->state != NULL", (netif->state != NULL));
mbed714	0:98aadd37a5c5	171
mbed714	0:98aadd37a5c5	172	priv = netif->state;
mbed714	0:98aadd37a5c5	173
mbed714	0:98aadd37a5c5	174	while (slip_sio_read(priv->sd, &c, 1, block) > 0) {
mbed714	0:98aadd37a5c5	175	switch (priv->state) {
mbed714	0:98aadd37a5c5	176	case SLIP_RECV_NORMAL:
mbed714	0:98aadd37a5c5	177	switch (c) {
mbed714	0:98aadd37a5c5	178	case SLIP_END:
mbed714	0:98aadd37a5c5	179	if (priv->recved > 0) {
mbed714	0:98aadd37a5c5	180	/* Received whole packet. */
mbed714	0:98aadd37a5c5	181	/* Trim the pbuf to the size of the received packet. */
mbed714	0:98aadd37a5c5	182	pbuf_realloc(priv->q, priv->recved);
mbed714	0:98aadd37a5c5	183
mbed714	0:98aadd37a5c5	184	LINK_STATS_INC(link.recv);
mbed714	0:98aadd37a5c5	185
mbed714	0:98aadd37a5c5	186	LWIP_DEBUGF(SLIP_DEBUG, ("slipif: Got packet\n"));
mbed714	0:98aadd37a5c5	187	t = priv->q;
mbed714	0:98aadd37a5c5	188	priv->p = priv->q = NULL;
mbed714	0:98aadd37a5c5	189	priv->i = priv->recved = 0;
mbed714	0:98aadd37a5c5	190	return t;
mbed714	0:98aadd37a5c5	191	}
mbed714	0:98aadd37a5c5	192	continue;
mbed714	0:98aadd37a5c5	193	case SLIP_ESC:
mbed714	0:98aadd37a5c5	194	priv->state = SLIP_RECV_ESCAPE;
mbed714	0:98aadd37a5c5	195	continue;
mbed714	0:98aadd37a5c5	196	}
mbed714	0:98aadd37a5c5	197	break;
mbed714	0:98aadd37a5c5	198	case SLIP_RECV_ESCAPE:
mbed714	0:98aadd37a5c5	199	switch (c) {
mbed714	0:98aadd37a5c5	200	case SLIP_ESC_END:
mbed714	0:98aadd37a5c5	201	c = SLIP_END;
mbed714	0:98aadd37a5c5	202	break;
mbed714	0:98aadd37a5c5	203	case SLIP_ESC_ESC:
mbed714	0:98aadd37a5c5	204	c = SLIP_ESC;
mbed714	0:98aadd37a5c5	205	break;
mbed714	0:98aadd37a5c5	206	}
mbed714	0:98aadd37a5c5	207	priv->state = SLIP_RECV_NORMAL;
mbed714	0:98aadd37a5c5	208	/* FALLTHROUGH */
mbed714	0:98aadd37a5c5	209	}
mbed714	0:98aadd37a5c5	210
mbed714	0:98aadd37a5c5	211	/* byte received, packet not yet completely received */
mbed714	0:98aadd37a5c5	212	if (priv->p == NULL) {
mbed714	0:98aadd37a5c5	213	/* allocate a new pbuf */
mbed714	0:98aadd37a5c5	214	LWIP_DEBUGF(SLIP_DEBUG, ("slipif_input: alloc\n"));
mbed714	0:98aadd37a5c5	215	priv->p = pbuf_alloc(PBUF_LINK, (PBUF_POOL_BUFSIZE - PBUF_LINK_HLEN), PBUF_POOL);
mbed714	0:98aadd37a5c5	216
mbed714	0:98aadd37a5c5	217	if (priv->p == NULL) {
mbed714	0:98aadd37a5c5	218	LINK_STATS_INC(link.drop);
mbed714	0:98aadd37a5c5	219	LWIP_DEBUGF(SLIP_DEBUG, ("slipif_input: no new pbuf! (DROP)\n"));
mbed714	0:98aadd37a5c5	220	/* don't process any further since we got no pbuf to receive to */
mbed714	0:98aadd37a5c5	221	break;
mbed714	0:98aadd37a5c5	222	}
mbed714	0:98aadd37a5c5	223
mbed714	0:98aadd37a5c5	224	if (priv->q != NULL) {
mbed714	0:98aadd37a5c5	225	/* 'chain' the pbuf to the existing chain */
mbed714	0:98aadd37a5c5	226	pbuf_cat(priv->q, priv->p);
mbed714	0:98aadd37a5c5	227	} else {
mbed714	0:98aadd37a5c5	228	/* p is the first pbuf in the chain */
mbed714	0:98aadd37a5c5	229	priv->q = priv->p;
mbed714	0:98aadd37a5c5	230	}
mbed714	0:98aadd37a5c5	231	}
mbed714	0:98aadd37a5c5	232
mbed714	0:98aadd37a5c5	233	/* this automatically drops bytes if > SLIP_MAX_SIZE */
mbed714	0:98aadd37a5c5	234	if ((priv->p != NULL) && (priv->recved <= SLIP_MAX_SIZE)) {
mbed714	0:98aadd37a5c5	235	((u8_t *)priv->p->payload)[priv->i] = c;
mbed714	0:98aadd37a5c5	236	priv->recved++;
mbed714	0:98aadd37a5c5	237	priv->i++;
mbed714	0:98aadd37a5c5	238	if (priv->i >= priv->p->len) {
mbed714	0:98aadd37a5c5	239	/* on to the next pbuf */
mbed714	0:98aadd37a5c5	240	priv->i = 0;
mbed714	0:98aadd37a5c5	241	if (priv->p->next != NULL && priv->p->next->len > 0) {
mbed714	0:98aadd37a5c5	242	/* p is a chain, on to the next in the chain */
mbed714	0:98aadd37a5c5	243	priv->p = priv->p->next;
mbed714	0:98aadd37a5c5	244	} else {
mbed714	0:98aadd37a5c5	245	/* p is a single pbuf, set it to NULL so next time a new
mbed714	0:98aadd37a5c5	246	* pbuf is allocated */
mbed714	0:98aadd37a5c5	247	priv->p = NULL;
mbed714	0:98aadd37a5c5	248	}
mbed714	0:98aadd37a5c5	249	}
mbed714	0:98aadd37a5c5	250	}
mbed714	0:98aadd37a5c5	251	}
mbed714	0:98aadd37a5c5	252
mbed714	0:98aadd37a5c5	253	return NULL;
mbed714	0:98aadd37a5c5	254	}
mbed714	0:98aadd37a5c5	255
mbed714	0:98aadd37a5c5	256	#if !NO_SYS
mbed714	0:98aadd37a5c5	257	/**
mbed714	0:98aadd37a5c5	258	* The SLIP input thread.
mbed714	0:98aadd37a5c5	259	*
mbed714	0:98aadd37a5c5	260	* Feed the IP layer with incoming packets
mbed714	0:98aadd37a5c5	261	*
mbed714	0:98aadd37a5c5	262	* @param nf the lwip network interface structure for this slipif
mbed714	0:98aadd37a5c5	263	*/
mbed714	0:98aadd37a5c5	264	static void
mbed714	0:98aadd37a5c5	265	slipif_loop_thread(void *nf)
mbed714	0:98aadd37a5c5	266	{
mbed714	0:98aadd37a5c5	267	struct pbuf *p;
mbed714	0:98aadd37a5c5	268	struct netif netif = (struct netif )nf;
mbed714	0:98aadd37a5c5	269
mbed714	0:98aadd37a5c5	270	while (1) {
mbed714	0:98aadd37a5c5	271	p = slipif_input(netif, SLIP_BLOCK);
mbed714	0:98aadd37a5c5	272	if (p != NULL) {
mbed714	0:98aadd37a5c5	273	if (netif->input(p, netif) != ERR_OK) {
mbed714	0:98aadd37a5c5	274	pbuf_free(p);
mbed714	0:98aadd37a5c5	275	p = NULL;
mbed714	0:98aadd37a5c5	276	}
mbed714	0:98aadd37a5c5	277	}
mbed714	0:98aadd37a5c5	278	}
mbed714	0:98aadd37a5c5	279	}
mbed714	0:98aadd37a5c5	280	#endif /* !NO_SYS */
mbed714	0:98aadd37a5c5	281
mbed714	0:98aadd37a5c5	282	/**
mbed714	0:98aadd37a5c5	283	* SLIP netif initialization
mbed714	0:98aadd37a5c5	284	*
mbed714	0:98aadd37a5c5	285	* Call the arch specific sio_open and remember
mbed714	0:98aadd37a5c5	286	* the opened device in the state field of the netif.
mbed714	0:98aadd37a5c5	287	*
mbed714	0:98aadd37a5c5	288	* @param netif the lwip network interface structure for this slipif
mbed714	0:98aadd37a5c5	289	* @return ERR_OK if serial line could be opened,
mbed714	0:98aadd37a5c5	290	* ERR_MEM if no memory could be allocated,
mbed714	0:98aadd37a5c5	291	* ERR_IF is serial line couldn't be opened
mbed714	0:98aadd37a5c5	292	*
mbed714	0:98aadd37a5c5	293	* @note netif->num must contain the number of the serial port to open
mbed714	0:98aadd37a5c5	294	* (0 by default)
mbed714	0:98aadd37a5c5	295	*/
mbed714	0:98aadd37a5c5	296	err_t
mbed714	0:98aadd37a5c5	297	slipif_init(struct netif *netif)
mbed714	0:98aadd37a5c5	298	{
mbed714	0:98aadd37a5c5	299	struct slipif_priv *priv;
mbed714	0:98aadd37a5c5	300
mbed714	0:98aadd37a5c5	301	LWIP_DEBUGF(SLIP_DEBUG, ("slipif_init: netif->num=%"U16_F"\n", (u16_t)netif->num));
mbed714	0:98aadd37a5c5	302
mbed714	0:98aadd37a5c5	303	/* Allocate private data */
mbed714	0:98aadd37a5c5	304	priv = mem_malloc(sizeof(struct slipif_priv));
mbed714	0:98aadd37a5c5	305	if (!priv) {
mbed714	0:98aadd37a5c5	306	return ERR_MEM;
mbed714	0:98aadd37a5c5	307	}
mbed714	0:98aadd37a5c5	308
mbed714	0:98aadd37a5c5	309	netif->name[0] = 's';
mbed714	0:98aadd37a5c5	310	netif->name[1] = 'l';
mbed714	0:98aadd37a5c5	311	netif->output = slipif_output;
mbed714	0:98aadd37a5c5	312	netif->mtu = SLIP_MAX_SIZE;
mbed714	0:98aadd37a5c5	313	netif->flags \|= NETIF_FLAG_POINTTOPOINT;
mbed714	0:98aadd37a5c5	314
mbed714	0:98aadd37a5c5	315	/* Try to open the serial port (netif->num contains the port number). */
mbed714	0:98aadd37a5c5	316	priv->sd = sio_open(netif->num);
mbed714	0:98aadd37a5c5	317	if (!priv->sd) {
mbed714	0:98aadd37a5c5	318	/* Opening the serial port failed. */
mbed714	0:98aadd37a5c5	319	mem_free(priv);
mbed714	0:98aadd37a5c5	320	return ERR_IF;
mbed714	0:98aadd37a5c5	321	}
mbed714	0:98aadd37a5c5	322
mbed714	0:98aadd37a5c5	323	/* Initialize private data */
mbed714	0:98aadd37a5c5	324	priv->p = NULL;
mbed714	0:98aadd37a5c5	325	priv->q = NULL;
mbed714	0:98aadd37a5c5	326	priv->state = SLIP_RECV_NORMAL;
mbed714	0:98aadd37a5c5	327	priv->i = 0;
mbed714	0:98aadd37a5c5	328	priv->recved = 0;
mbed714	0:98aadd37a5c5	329
mbed714	0:98aadd37a5c5	330	netif->state = priv;
mbed714	0:98aadd37a5c5	331
mbed714	0:98aadd37a5c5	332	/* initialize the snmp variables and counters inside the struct netif
mbed714	0:98aadd37a5c5	333	* ifSpeed: no assumption can be made without knowing more about the
mbed714	0:98aadd37a5c5	334	* serial line!
mbed714	0:98aadd37a5c5	335	*/
mbed714	0:98aadd37a5c5	336	NETIF_INIT_SNMP(netif, snmp_ifType_slip, 0);
mbed714	0:98aadd37a5c5	337
mbed714	0:98aadd37a5c5	338	/* Create a thread to poll the serial line. */
mbed714	0:98aadd37a5c5	339	sys_thread_new(SLIPIF_THREAD_NAME, slipif_loop_thread, netif,
mbed714	0:98aadd37a5c5	340	SLIPIF_THREAD_STACKSIZE, SLIPIF_THREAD_PRIO);
mbed714	0:98aadd37a5c5	341	return ERR_OK;
mbed714	0:98aadd37a5c5	342	}
mbed714	0:98aadd37a5c5	343
mbed714	0:98aadd37a5c5	344	/**
mbed714	0:98aadd37a5c5	345	* Polls the serial device and feeds the IP layer with incoming packets.
mbed714	0:98aadd37a5c5	346	*
mbed714	0:98aadd37a5c5	347	* @param netif The lwip network interface structure for this slipif
mbed714	0:98aadd37a5c5	348	*/
mbed714	0:98aadd37a5c5	349	void
mbed714	0:98aadd37a5c5	350	slipif_poll(struct netif *netif)
mbed714	0:98aadd37a5c5	351	{
mbed714	0:98aadd37a5c5	352	struct pbuf *p;
mbed714	0:98aadd37a5c5	353	struct slipif_priv *priv;
mbed714	0:98aadd37a5c5	354
mbed714	0:98aadd37a5c5	355	LWIP_ASSERT("netif != NULL", (netif != NULL));
mbed714	0:98aadd37a5c5	356	LWIP_ASSERT("netif->state != NULL", (netif->state != NULL));
mbed714	0:98aadd37a5c5	357
mbed714	0:98aadd37a5c5	358	priv = netif->state;
mbed714	0:98aadd37a5c5	359
mbed714	0:98aadd37a5c5	360	while ((p = slipif_input(netif, SLIP_DONTBLOCK)) != NULL) {
mbed714	0:98aadd37a5c5	361	if (netif->input(p, netif) != ERR_OK) {
mbed714	0:98aadd37a5c5	362	pbuf_free(p);
mbed714	0:98aadd37a5c5	363	}
mbed714	0:98aadd37a5c5	364	}
mbed714	0:98aadd37a5c5	365	}
mbed714	0:98aadd37a5c5	366
mbed714	0:98aadd37a5c5	367	#endif /* LWIP_HAVE_SLIPIF */

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Type:	Library
Created:	29 Sep 2010
Imports:	7
Forks:	0
Commits:	4
Dependents:	0
Dependencies:	0
Followers:	1

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lwip/netif/slipif.c@3:0c324737064d, 2010-11-09 (annotated)

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