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Adam Green / Mbed 2 deprecated WeatherStation

Web server based weather station using Sparkfun Weather Meters.

Dependencies: FatFileSystem mbed WeatherMeters SDFileSystem

NetStack/lwip/netif/slipif.c@0:616601bde9fb, 2012-02-23 (annotated)

Committer:: AdamGreen
Date:: Thu Feb 23 21:38:39 2012 +0000
Revision:: 0:616601bde9fb

Who changed what in which revision?

User	Revision	Line number	New contents of line
AdamGreen	0:616601bde9fb	1	/**
AdamGreen	0:616601bde9fb	2	* @file
AdamGreen	0:616601bde9fb	3	* SLIP Interface
AdamGreen	0:616601bde9fb	4	*
AdamGreen	0:616601bde9fb	5	*/
AdamGreen	0:616601bde9fb	6
AdamGreen	0:616601bde9fb	7	/*
AdamGreen	0:616601bde9fb	8	* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
AdamGreen	0:616601bde9fb	9	* All rights reserved.
AdamGreen	0:616601bde9fb	10	*
AdamGreen	0:616601bde9fb	11	* Redistribution and use in source and binary forms, with or without
AdamGreen	0:616601bde9fb	12	* modification, are permitted provided that the following conditions
AdamGreen	0:616601bde9fb	13	* are met:
AdamGreen	0:616601bde9fb	14	* 1. Redistributions of source code must retain the above copyright
AdamGreen	0:616601bde9fb	15	* notice, this list of conditions and the following disclaimer.
AdamGreen	0:616601bde9fb	16	* 2. Redistributions in binary form must reproduce the above copyright
AdamGreen	0:616601bde9fb	17	* notice, this list of conditions and the following disclaimer in the
AdamGreen	0:616601bde9fb	18	* documentation and/or other materials provided with the distribution.
AdamGreen	0:616601bde9fb	19	* 3. Neither the name of the Institute nor the names of its contributors
AdamGreen	0:616601bde9fb	20	* may be used to endorse or promote products derived from this software
AdamGreen	0:616601bde9fb	21	* without specific prior written permission.
AdamGreen	0:616601bde9fb	22	*
AdamGreen	0:616601bde9fb	23	* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
AdamGreen	0:616601bde9fb	24	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
AdamGreen	0:616601bde9fb	25	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
AdamGreen	0:616601bde9fb	26	* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
AdamGreen	0:616601bde9fb	27	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
AdamGreen	0:616601bde9fb	28	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
AdamGreen	0:616601bde9fb	29	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
AdamGreen	0:616601bde9fb	30	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
AdamGreen	0:616601bde9fb	31	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
AdamGreen	0:616601bde9fb	32	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
AdamGreen	0:616601bde9fb	33	* SUCH DAMAGE.
AdamGreen	0:616601bde9fb	34	*
AdamGreen	0:616601bde9fb	35	* This file is built upon the file: src/arch/rtxc/netif/sioslip.c
AdamGreen	0:616601bde9fb	36	*
AdamGreen	0:616601bde9fb	37	* Author: Magnus Ivarsson <magnus.ivarsson(at)volvo.com>
AdamGreen	0:616601bde9fb	38	*/
AdamGreen	0:616601bde9fb	39
AdamGreen	0:616601bde9fb	40	/*
AdamGreen	0:616601bde9fb	41	* This is an arch independent SLIP netif. The specific serial hooks must be
AdamGreen	0:616601bde9fb	42	* provided by another file. They are sio_open, sio_read/sio_tryread and sio_send
AdamGreen	0:616601bde9fb	43	*/
AdamGreen	0:616601bde9fb	44
AdamGreen	0:616601bde9fb	45	#include "netif/slipif.h"
AdamGreen	0:616601bde9fb	46	#include "lwip/opt.h"
AdamGreen	0:616601bde9fb	47
AdamGreen	0:616601bde9fb	48	#if LWIP_HAVE_SLIPIF
AdamGreen	0:616601bde9fb	49
AdamGreen	0:616601bde9fb	50	#include "lwip/def.h"
AdamGreen	0:616601bde9fb	51	#include "lwip/pbuf.h"
AdamGreen	0:616601bde9fb	52	#include "lwip/sys.h"
AdamGreen	0:616601bde9fb	53	#include "lwip/stats.h"
AdamGreen	0:616601bde9fb	54	#include "lwip/snmp.h"
AdamGreen	0:616601bde9fb	55	#include "lwip/sio.h"
AdamGreen	0:616601bde9fb	56
AdamGreen	0:616601bde9fb	57	#define SLIP_BLOCK 1
AdamGreen	0:616601bde9fb	58	#define SLIP_DONTBLOCK 0
AdamGreen	0:616601bde9fb	59
AdamGreen	0:616601bde9fb	60	#define SLIP_END 0300 /* 0xC0 */
AdamGreen	0:616601bde9fb	61	#define SLIP_ESC 0333 /* 0xDB */
AdamGreen	0:616601bde9fb	62	#define SLIP_ESC_END 0334 /* 0xDC */
AdamGreen	0:616601bde9fb	63	#define SLIP_ESC_ESC 0335 /* 0xDD */
AdamGreen	0:616601bde9fb	64
AdamGreen	0:616601bde9fb	65	#define SLIP_MAX_SIZE 1500
AdamGreen	0:616601bde9fb	66
AdamGreen	0:616601bde9fb	67	enum slipif_recv_state {
AdamGreen	0:616601bde9fb	68	SLIP_RECV_NORMAL,
AdamGreen	0:616601bde9fb	69	SLIP_RECV_ESCAPE,
AdamGreen	0:616601bde9fb	70	};
AdamGreen	0:616601bde9fb	71
AdamGreen	0:616601bde9fb	72	struct slipif_priv {
AdamGreen	0:616601bde9fb	73	sio_fd_t sd;
AdamGreen	0:616601bde9fb	74	/* q is the whole pbuf chain for a packet, p is the current pbuf in the chain */
AdamGreen	0:616601bde9fb	75	struct pbuf p, q;
AdamGreen	0:616601bde9fb	76	enum slipif_recv_state state;
AdamGreen	0:616601bde9fb	77	u16_t i, recved;
AdamGreen	0:616601bde9fb	78	};
AdamGreen	0:616601bde9fb	79
AdamGreen	0:616601bde9fb	80	/**
AdamGreen	0:616601bde9fb	81	* Send a pbuf doing the necessary SLIP encapsulation
AdamGreen	0:616601bde9fb	82	*
AdamGreen	0:616601bde9fb	83	* Uses the serial layer's sio_send()
AdamGreen	0:616601bde9fb	84	*
AdamGreen	0:616601bde9fb	85	* @param netif the lwip network interface structure for this slipif
AdamGreen	0:616601bde9fb	86	* @param p the pbuf chaing packet to send
AdamGreen	0:616601bde9fb	87	* @param ipaddr the ip address to send the packet to (not used for slipif)
AdamGreen	0:616601bde9fb	88	* @return always returns ERR_OK since the serial layer does not provide return values
AdamGreen	0:616601bde9fb	89	*/
AdamGreen	0:616601bde9fb	90	err_t
AdamGreen	0:616601bde9fb	91	slipif_output(struct netif netif, struct pbuf p, ip_addr_t *ipaddr)
AdamGreen	0:616601bde9fb	92	{
AdamGreen	0:616601bde9fb	93	struct slipif_priv *priv;
AdamGreen	0:616601bde9fb	94	struct pbuf *q;
AdamGreen	0:616601bde9fb	95	u16_t i;
AdamGreen	0:616601bde9fb	96	u8_t c;
AdamGreen	0:616601bde9fb	97
AdamGreen	0:616601bde9fb	98	LWIP_ASSERT("netif != NULL", (netif != NULL));
AdamGreen	0:616601bde9fb	99	LWIP_ASSERT("netif->state != NULL", (netif->state != NULL));
AdamGreen	0:616601bde9fb	100	LWIP_ASSERT("p != NULL", (p != NULL));
AdamGreen	0:616601bde9fb	101
AdamGreen	0:616601bde9fb	102	LWIP_UNUSED_ARG(ipaddr);
AdamGreen	0:616601bde9fb	103
AdamGreen	0:616601bde9fb	104	priv = netif->state;
AdamGreen	0:616601bde9fb	105
AdamGreen	0:616601bde9fb	106	/* Send pbuf out on the serial I/O device. */
AdamGreen	0:616601bde9fb	107	sio_send(SLIP_END, priv->sd);
AdamGreen	0:616601bde9fb	108
AdamGreen	0:616601bde9fb	109	for (q = p; q != NULL; q = q->next) {
AdamGreen	0:616601bde9fb	110	for (i = 0; i < q->len; i++) {
AdamGreen	0:616601bde9fb	111	c = ((u8_t *)q->payload)[i];
AdamGreen	0:616601bde9fb	112	switch (c) {
AdamGreen	0:616601bde9fb	113	case SLIP_END:
AdamGreen	0:616601bde9fb	114	sio_send(SLIP_ESC, priv->sd);
AdamGreen	0:616601bde9fb	115	sio_send(SLIP_ESC_END, priv->sd);
AdamGreen	0:616601bde9fb	116	break;
AdamGreen	0:616601bde9fb	117	case SLIP_ESC:
AdamGreen	0:616601bde9fb	118	sio_send(SLIP_ESC, priv->sd);
AdamGreen	0:616601bde9fb	119	sio_send(SLIP_ESC_ESC, priv->sd);
AdamGreen	0:616601bde9fb	120	break;
AdamGreen	0:616601bde9fb	121	default:
AdamGreen	0:616601bde9fb	122	sio_send(c, priv->sd);
AdamGreen	0:616601bde9fb	123	break;
AdamGreen	0:616601bde9fb	124	}
AdamGreen	0:616601bde9fb	125	}
AdamGreen	0:616601bde9fb	126	}
AdamGreen	0:616601bde9fb	127	sio_send(SLIP_END, priv->sd);
AdamGreen	0:616601bde9fb	128	return ERR_OK;
AdamGreen	0:616601bde9fb	129	}
AdamGreen	0:616601bde9fb	130
AdamGreen	0:616601bde9fb	131	/**
AdamGreen	0:616601bde9fb	132	* Static function for easy use of blockig or non-blocking
AdamGreen	0:616601bde9fb	133	* sio_read
AdamGreen	0:616601bde9fb	134	*
AdamGreen	0:616601bde9fb	135	* @param fd serial device handle
AdamGreen	0:616601bde9fb	136	* @param data pointer to data buffer for receiving
AdamGreen	0:616601bde9fb	137	* @param len maximum length (in bytes) of data to receive
AdamGreen	0:616601bde9fb	138	* @param block if 1, call sio_read; if 0, call sio_tryread
AdamGreen	0:616601bde9fb	139	* @return return value of sio_read of sio_tryread
AdamGreen	0:616601bde9fb	140	*/
AdamGreen	0:616601bde9fb	141	static u32_t
AdamGreen	0:616601bde9fb	142	slip_sio_read(sio_fd_t fd, u8_t* data, u32_t len, u8_t block)
AdamGreen	0:616601bde9fb	143	{
AdamGreen	0:616601bde9fb	144	if (block) {
AdamGreen	0:616601bde9fb	145	return sio_read(fd, data, len);
AdamGreen	0:616601bde9fb	146	} else {
AdamGreen	0:616601bde9fb	147	return sio_tryread(fd, data, len);
AdamGreen	0:616601bde9fb	148	}
AdamGreen	0:616601bde9fb	149	}
AdamGreen	0:616601bde9fb	150
AdamGreen	0:616601bde9fb	151	/**
AdamGreen	0:616601bde9fb	152	* Handle the incoming SLIP stream character by character
AdamGreen	0:616601bde9fb	153	*
AdamGreen	0:616601bde9fb	154	* Poll the serial layer by calling sio_read() or sio_tryread().
AdamGreen	0:616601bde9fb	155	*
AdamGreen	0:616601bde9fb	156	* @param netif the lwip network interface structure for this slipif
AdamGreen	0:616601bde9fb	157	* @param block if 1, block until data is received; if 0, return when all data
AdamGreen	0:616601bde9fb	158	* from the buffer is received (multiple calls to this function will
AdamGreen	0:616601bde9fb	159	* return a complete packet, NULL is returned before - used for polling)
AdamGreen	0:616601bde9fb	160	* @return The IP packet when SLIP_END is received
AdamGreen	0:616601bde9fb	161	*/
AdamGreen	0:616601bde9fb	162	static struct pbuf *
AdamGreen	0:616601bde9fb	163	slipif_input(struct netif *netif, u8_t block)
AdamGreen	0:616601bde9fb	164	{
AdamGreen	0:616601bde9fb	165	struct slipif_priv *priv;
AdamGreen	0:616601bde9fb	166	u8_t c;
AdamGreen	0:616601bde9fb	167	struct pbuf *t;
AdamGreen	0:616601bde9fb	168
AdamGreen	0:616601bde9fb	169	LWIP_ASSERT("netif != NULL", (netif != NULL));
AdamGreen	0:616601bde9fb	170	LWIP_ASSERT("netif->state != NULL", (netif->state != NULL));
AdamGreen	0:616601bde9fb	171
AdamGreen	0:616601bde9fb	172	priv = netif->state;
AdamGreen	0:616601bde9fb	173
AdamGreen	0:616601bde9fb	174	while (slip_sio_read(priv->sd, &c, 1, block) > 0) {
AdamGreen	0:616601bde9fb	175	switch (priv->state) {
AdamGreen	0:616601bde9fb	176	case SLIP_RECV_NORMAL:
AdamGreen	0:616601bde9fb	177	switch (c) {
AdamGreen	0:616601bde9fb	178	case SLIP_END:
AdamGreen	0:616601bde9fb	179	if (priv->recved > 0) {
AdamGreen	0:616601bde9fb	180	/* Received whole packet. */
AdamGreen	0:616601bde9fb	181	/* Trim the pbuf to the size of the received packet. */
AdamGreen	0:616601bde9fb	182	pbuf_realloc(priv->q, priv->recved);
AdamGreen	0:616601bde9fb	183
AdamGreen	0:616601bde9fb	184	LINK_STATS_INC(link.recv);
AdamGreen	0:616601bde9fb	185
AdamGreen	0:616601bde9fb	186	LWIP_DEBUGF(SLIP_DEBUG, ("slipif: Got packet\n"));
AdamGreen	0:616601bde9fb	187	t = priv->q;
AdamGreen	0:616601bde9fb	188	priv->p = priv->q = NULL;
AdamGreen	0:616601bde9fb	189	priv->i = priv->recved = 0;
AdamGreen	0:616601bde9fb	190	return t;
AdamGreen	0:616601bde9fb	191	}
AdamGreen	0:616601bde9fb	192	continue;
AdamGreen	0:616601bde9fb	193	case SLIP_ESC:
AdamGreen	0:616601bde9fb	194	priv->state = SLIP_RECV_ESCAPE;
AdamGreen	0:616601bde9fb	195	continue;
AdamGreen	0:616601bde9fb	196	}
AdamGreen	0:616601bde9fb	197	break;
AdamGreen	0:616601bde9fb	198	case SLIP_RECV_ESCAPE:
AdamGreen	0:616601bde9fb	199	switch (c) {
AdamGreen	0:616601bde9fb	200	case SLIP_ESC_END:
AdamGreen	0:616601bde9fb	201	c = SLIP_END;
AdamGreen	0:616601bde9fb	202	break;
AdamGreen	0:616601bde9fb	203	case SLIP_ESC_ESC:
AdamGreen	0:616601bde9fb	204	c = SLIP_ESC;
AdamGreen	0:616601bde9fb	205	break;
AdamGreen	0:616601bde9fb	206	}
AdamGreen	0:616601bde9fb	207	priv->state = SLIP_RECV_NORMAL;
AdamGreen	0:616601bde9fb	208	/* FALLTHROUGH */
AdamGreen	0:616601bde9fb	209	}
AdamGreen	0:616601bde9fb	210
AdamGreen	0:616601bde9fb	211	/* byte received, packet not yet completely received */
AdamGreen	0:616601bde9fb	212	if (priv->p == NULL) {
AdamGreen	0:616601bde9fb	213	/* allocate a new pbuf */
AdamGreen	0:616601bde9fb	214	LWIP_DEBUGF(SLIP_DEBUG, ("slipif_input: alloc\n"));
AdamGreen	0:616601bde9fb	215	priv->p = pbuf_alloc(PBUF_LINK, (PBUF_POOL_BUFSIZE - PBUF_LINK_HLEN), PBUF_POOL);
AdamGreen	0:616601bde9fb	216
AdamGreen	0:616601bde9fb	217	if (priv->p == NULL) {
AdamGreen	0:616601bde9fb	218	LINK_STATS_INC(link.drop);
AdamGreen	0:616601bde9fb	219	LWIP_DEBUGF(SLIP_DEBUG, ("slipif_input: no new pbuf! (DROP)\n"));
AdamGreen	0:616601bde9fb	220	/* don't process any further since we got no pbuf to receive to */
AdamGreen	0:616601bde9fb	221	break;
AdamGreen	0:616601bde9fb	222	}
AdamGreen	0:616601bde9fb	223
AdamGreen	0:616601bde9fb	224	if (priv->q != NULL) {
AdamGreen	0:616601bde9fb	225	/* 'chain' the pbuf to the existing chain */
AdamGreen	0:616601bde9fb	226	pbuf_cat(priv->q, priv->p);
AdamGreen	0:616601bde9fb	227	} else {
AdamGreen	0:616601bde9fb	228	/* p is the first pbuf in the chain */
AdamGreen	0:616601bde9fb	229	priv->q = priv->p;
AdamGreen	0:616601bde9fb	230	}
AdamGreen	0:616601bde9fb	231	}
AdamGreen	0:616601bde9fb	232
AdamGreen	0:616601bde9fb	233	/* this automatically drops bytes if > SLIP_MAX_SIZE */
AdamGreen	0:616601bde9fb	234	if ((priv->p != NULL) && (priv->recved <= SLIP_MAX_SIZE)) {
AdamGreen	0:616601bde9fb	235	((u8_t *)priv->p->payload)[priv->i] = c;
AdamGreen	0:616601bde9fb	236	priv->recved++;
AdamGreen	0:616601bde9fb	237	priv->i++;
AdamGreen	0:616601bde9fb	238	if (priv->i >= priv->p->len) {
AdamGreen	0:616601bde9fb	239	/* on to the next pbuf */
AdamGreen	0:616601bde9fb	240	priv->i = 0;
AdamGreen	0:616601bde9fb	241	if (priv->p->next != NULL && priv->p->next->len > 0) {
AdamGreen	0:616601bde9fb	242	/* p is a chain, on to the next in the chain */
AdamGreen	0:616601bde9fb	243	priv->p = priv->p->next;
AdamGreen	0:616601bde9fb	244	} else {
AdamGreen	0:616601bde9fb	245	/* p is a single pbuf, set it to NULL so next time a new
AdamGreen	0:616601bde9fb	246	* pbuf is allocated */
AdamGreen	0:616601bde9fb	247	priv->p = NULL;
AdamGreen	0:616601bde9fb	248	}
AdamGreen	0:616601bde9fb	249	}
AdamGreen	0:616601bde9fb	250	}
AdamGreen	0:616601bde9fb	251	}
AdamGreen	0:616601bde9fb	252
AdamGreen	0:616601bde9fb	253	return NULL;
AdamGreen	0:616601bde9fb	254	}
AdamGreen	0:616601bde9fb	255
AdamGreen	0:616601bde9fb	256	#if !NO_SYS
AdamGreen	0:616601bde9fb	257	/**
AdamGreen	0:616601bde9fb	258	* The SLIP input thread.
AdamGreen	0:616601bde9fb	259	*
AdamGreen	0:616601bde9fb	260	* Feed the IP layer with incoming packets
AdamGreen	0:616601bde9fb	261	*
AdamGreen	0:616601bde9fb	262	* @param nf the lwip network interface structure for this slipif
AdamGreen	0:616601bde9fb	263	*/
AdamGreen	0:616601bde9fb	264	static void
AdamGreen	0:616601bde9fb	265	slipif_loop_thread(void *nf)
AdamGreen	0:616601bde9fb	266	{
AdamGreen	0:616601bde9fb	267	struct pbuf *p;
AdamGreen	0:616601bde9fb	268	struct netif netif = (struct netif )nf;
AdamGreen	0:616601bde9fb	269
AdamGreen	0:616601bde9fb	270	while (1) {
AdamGreen	0:616601bde9fb	271	p = slipif_input(netif, SLIP_BLOCK);
AdamGreen	0:616601bde9fb	272	if (p != NULL) {
AdamGreen	0:616601bde9fb	273	if (netif->input(p, netif) != ERR_OK) {
AdamGreen	0:616601bde9fb	274	pbuf_free(p);
AdamGreen	0:616601bde9fb	275	p = NULL;
AdamGreen	0:616601bde9fb	276	}
AdamGreen	0:616601bde9fb	277	}
AdamGreen	0:616601bde9fb	278	}
AdamGreen	0:616601bde9fb	279	}
AdamGreen	0:616601bde9fb	280	#endif /* !NO_SYS */
AdamGreen	0:616601bde9fb	281
AdamGreen	0:616601bde9fb	282	/**
AdamGreen	0:616601bde9fb	283	* SLIP netif initialization
AdamGreen	0:616601bde9fb	284	*
AdamGreen	0:616601bde9fb	285	* Call the arch specific sio_open and remember
AdamGreen	0:616601bde9fb	286	* the opened device in the state field of the netif.
AdamGreen	0:616601bde9fb	287	*
AdamGreen	0:616601bde9fb	288	* @param netif the lwip network interface structure for this slipif
AdamGreen	0:616601bde9fb	289	* @return ERR_OK if serial line could be opened,
AdamGreen	0:616601bde9fb	290	* ERR_MEM if no memory could be allocated,
AdamGreen	0:616601bde9fb	291	* ERR_IF is serial line couldn't be opened
AdamGreen	0:616601bde9fb	292	*
AdamGreen	0:616601bde9fb	293	* @note netif->num must contain the number of the serial port to open
AdamGreen	0:616601bde9fb	294	* (0 by default)
AdamGreen	0:616601bde9fb	295	*/
AdamGreen	0:616601bde9fb	296	err_t
AdamGreen	0:616601bde9fb	297	slipif_init(struct netif *netif)
AdamGreen	0:616601bde9fb	298	{
AdamGreen	0:616601bde9fb	299	struct slipif_priv *priv;
AdamGreen	0:616601bde9fb	300
AdamGreen	0:616601bde9fb	301	LWIP_DEBUGF(SLIP_DEBUG, ("slipif_init: netif->num=%"U16_F"\n", (u16_t)netif->num));
AdamGreen	0:616601bde9fb	302
AdamGreen	0:616601bde9fb	303	/* Allocate private data */
AdamGreen	0:616601bde9fb	304	priv = mem_malloc(sizeof(struct slipif_priv));
AdamGreen	0:616601bde9fb	305	if (!priv) {
AdamGreen	0:616601bde9fb	306	return ERR_MEM;
AdamGreen	0:616601bde9fb	307	}
AdamGreen	0:616601bde9fb	308
AdamGreen	0:616601bde9fb	309	netif->name[0] = 's';
AdamGreen	0:616601bde9fb	310	netif->name[1] = 'l';
AdamGreen	0:616601bde9fb	311	netif->output = slipif_output;
AdamGreen	0:616601bde9fb	312	netif->mtu = SLIP_MAX_SIZE;
AdamGreen	0:616601bde9fb	313	netif->flags \|= NETIF_FLAG_POINTTOPOINT;
AdamGreen	0:616601bde9fb	314
AdamGreen	0:616601bde9fb	315	/* Try to open the serial port (netif->num contains the port number). */
AdamGreen	0:616601bde9fb	316	priv->sd = sio_open(netif->num);
AdamGreen	0:616601bde9fb	317	if (!priv->sd) {
AdamGreen	0:616601bde9fb	318	/* Opening the serial port failed. */
AdamGreen	0:616601bde9fb	319	mem_free(priv);
AdamGreen	0:616601bde9fb	320	return ERR_IF;
AdamGreen	0:616601bde9fb	321	}
AdamGreen	0:616601bde9fb	322
AdamGreen	0:616601bde9fb	323	/* Initialize private data */
AdamGreen	0:616601bde9fb	324	priv->p = NULL;
AdamGreen	0:616601bde9fb	325	priv->q = NULL;
AdamGreen	0:616601bde9fb	326	priv->state = SLIP_RECV_NORMAL;
AdamGreen	0:616601bde9fb	327	priv->i = 0;
AdamGreen	0:616601bde9fb	328	priv->recved = 0;
AdamGreen	0:616601bde9fb	329
AdamGreen	0:616601bde9fb	330	netif->state = priv;
AdamGreen	0:616601bde9fb	331
AdamGreen	0:616601bde9fb	332	/* initialize the snmp variables and counters inside the struct netif
AdamGreen	0:616601bde9fb	333	* ifSpeed: no assumption can be made without knowing more about the
AdamGreen	0:616601bde9fb	334	* serial line!
AdamGreen	0:616601bde9fb	335	*/
AdamGreen	0:616601bde9fb	336	NETIF_INIT_SNMP(netif, snmp_ifType_slip, 0);
AdamGreen	0:616601bde9fb	337
AdamGreen	0:616601bde9fb	338	/* Create a thread to poll the serial line. */
AdamGreen	0:616601bde9fb	339	sys_thread_new(SLIPIF_THREAD_NAME, slipif_loop_thread, netif,
AdamGreen	0:616601bde9fb	340	SLIPIF_THREAD_STACKSIZE, SLIPIF_THREAD_PRIO);
AdamGreen	0:616601bde9fb	341	return ERR_OK;
AdamGreen	0:616601bde9fb	342	}
AdamGreen	0:616601bde9fb	343
AdamGreen	0:616601bde9fb	344	/**
AdamGreen	0:616601bde9fb	345	* Polls the serial device and feeds the IP layer with incoming packets.
AdamGreen	0:616601bde9fb	346	*
AdamGreen	0:616601bde9fb	347	* @param netif The lwip network interface structure for this slipif
AdamGreen	0:616601bde9fb	348	*/
AdamGreen	0:616601bde9fb	349	void
AdamGreen	0:616601bde9fb	350	slipif_poll(struct netif *netif)
AdamGreen	0:616601bde9fb	351	{
AdamGreen	0:616601bde9fb	352	struct pbuf *p;
AdamGreen	0:616601bde9fb	353	struct slipif_priv *priv;
AdamGreen	0:616601bde9fb	354
AdamGreen	0:616601bde9fb	355	LWIP_ASSERT("netif != NULL", (netif != NULL));
AdamGreen	0:616601bde9fb	356	LWIP_ASSERT("netif->state != NULL", (netif->state != NULL));
AdamGreen	0:616601bde9fb	357
AdamGreen	0:616601bde9fb	358	priv = netif->state;
AdamGreen	0:616601bde9fb	359
AdamGreen	0:616601bde9fb	360	while ((p = slipif_input(netif, SLIP_DONTBLOCK)) != NULL) {
AdamGreen	0:616601bde9fb	361	if (netif->input(p, netif) != ERR_OK) {
AdamGreen	0:616601bde9fb	362	pbuf_free(p);
AdamGreen	0:616601bde9fb	363	}
AdamGreen	0:616601bde9fb	364	}
AdamGreen	0:616601bde9fb	365	}
AdamGreen	0:616601bde9fb	366
AdamGreen	0:616601bde9fb	367	#endif /* LWIP_HAVE_SLIPIF */

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	23 Feb 2012
Imports:	113
Forks:	0
Commits:	2
Dependents:	0
Dependencies:	4
Followers:	6

NetStack/lwip/netif/slipif.c@0:616601bde9fb, 2012-02-23 (annotated)

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