[457] | 1 | /**
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| 2 | * @file
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| 3 | * SLIP Interface
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| 4 | *
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| 5 | */
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| 6 |
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| 7 | /*
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| 8 | * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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| 9 | * All rights reserved.
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| 10 | *
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| 11 | * Redistribution and use in source and binary forms, with or without
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| 12 | * modification, are permitted provided that the following conditions
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| 13 | * are met:
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| 14 | * 1. Redistributions of source code must retain the above copyright
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| 15 | * notice, this list of conditions and the following disclaimer.
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| 16 | * 2. Redistributions in binary form must reproduce the above copyright
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| 17 | * notice, this list of conditions and the following disclaimer in the
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| 18 | * documentation and/or other materials provided with the distribution.
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| 19 | * 3. Neither the name of the Institute nor the names of its contributors
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| 20 | * may be used to endorse or promote products derived from this software
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| 21 | * without specific prior written permission.
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| 22 | *
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| 23 | * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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| 24 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 25 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 26 | * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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| 27 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 28 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 29 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 30 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 31 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 32 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 33 | * SUCH DAMAGE.
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| 34 | *
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| 35 | * This file is built upon the file: src/arch/rtxc/netif/sioslip.c
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| 36 | *
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| 37 | * Author: Magnus Ivarsson <magnus.ivarsson(at)volvo.com>
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| 38 | * Simon Goldschmidt
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| 39 | */
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| 40 |
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| 41 |
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| 42 | /**
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| 43 | * @defgroup slipif SLIP
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| 44 | * @ingroup netifs
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| 45 | *
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| 46 | * This is an arch independent SLIP netif. The specific serial hooks must be
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| 47 | * provided by another file. They are sio_open, sio_read/sio_tryread and sio_send
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| 48 | *
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| 49 | * Usage: This netif can be used in three ways:\n
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| 50 | * 1) For NO_SYS==0, an RX thread can be used which blocks on sio_read()
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| 51 | * until data is received.\n
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| 52 | * 2) In your main loop, call slipif_poll() to check for new RX bytes,
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| 53 | * completed packets are fed into netif->input().\n
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| 54 | * 3) Call slipif_received_byte[s]() from your serial RX ISR and
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| 55 | * slipif_process_rxqueue() from your main loop. ISR level decodes
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| 56 | * packets and puts completed packets on a queue which is fed into
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| 57 | * the stack from the main loop (needs SYS_LIGHTWEIGHT_PROT for
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| 58 | * pbuf_alloc to work on ISR level!).
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| 59 | *
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| 60 | */
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| 61 |
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| 62 | #include "netif/slipif.h"
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| 63 | #include "lwip/opt.h"
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| 64 |
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| 65 | #include "lwip/def.h"
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| 66 | #include "lwip/pbuf.h"
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| 67 | #include "lwip/stats.h"
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| 68 | #include "lwip/snmp.h"
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| 69 | #include "lwip/sys.h"
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| 70 | #include "lwip/sio.h"
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| 71 |
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| 72 | #define SLIP_END 0xC0 /* 0300: start and end of every packet */
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| 73 | #define SLIP_ESC 0xDB /* 0333: escape start (one byte escaped data follows) */
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| 74 | #define SLIP_ESC_END 0xDC /* 0334: following escape: original byte is 0xC0 (END) */
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| 75 | #define SLIP_ESC_ESC 0xDD /* 0335: following escape: original byte is 0xDB (ESC) */
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| 76 |
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| 77 | /** Maximum packet size that is received by this netif */
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| 78 | #ifndef SLIP_MAX_SIZE
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| 79 | #define SLIP_MAX_SIZE 1500
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| 80 | #endif
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| 81 |
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| 82 | /** Define this to the interface speed for SNMP
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| 83 | * (sio_fd is the sio_fd_t returned by sio_open).
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| 84 | * The default value of zero means 'unknown'.
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| 85 | */
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| 86 | #ifndef SLIP_SIO_SPEED
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| 87 | #define SLIP_SIO_SPEED(sio_fd) 0
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| 88 | #endif
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| 89 |
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| 90 | enum slipif_recv_state {
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| 91 | SLIP_RECV_NORMAL,
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| 92 | SLIP_RECV_ESCAPE
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| 93 | };
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| 94 |
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| 95 | struct slipif_priv {
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| 96 | sio_fd_t sd;
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| 97 | /* q is the whole pbuf chain for a packet, p is the current pbuf in the chain */
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| 98 | struct pbuf *p, *q;
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| 99 | u8_t state;
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| 100 | u16_t i, recved;
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| 101 | #if SLIP_RX_FROM_ISR
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| 102 | struct pbuf *rxpackets;
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| 103 | #endif
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| 104 | };
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| 105 |
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| 106 | /**
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| 107 | * Send a pbuf doing the necessary SLIP encapsulation
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| 108 | *
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| 109 | * Uses the serial layer's sio_send()
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| 110 | *
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| 111 | * @param netif the lwip network interface structure for this slipif
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| 112 | * @param p the pbuf chain packet to send
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| 113 | * @return always returns ERR_OK since the serial layer does not provide return values
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| 114 | */
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| 115 | static err_t
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| 116 | slipif_output(struct netif *netif, struct pbuf *p)
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| 117 | {
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| 118 | struct slipif_priv *priv;
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| 119 | struct pbuf *q;
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| 120 | u16_t i;
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| 121 | u8_t c;
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| 122 |
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| 123 | LWIP_ASSERT("netif != NULL", (netif != NULL));
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| 124 | LWIP_ASSERT("netif->state != NULL", (netif->state != NULL));
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| 125 | LWIP_ASSERT("p != NULL", (p != NULL));
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| 126 |
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| 127 | LWIP_DEBUGF(SLIP_DEBUG, ("slipif_output: sending %"U16_F" bytes\n", p->tot_len));
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| 128 | priv = (struct slipif_priv *)netif->state;
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| 129 |
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| 130 | /* Send pbuf out on the serial I/O device. */
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| 131 | /* Start with packet delimiter. */
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| 132 | sio_send(SLIP_END, priv->sd);
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| 133 |
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| 134 | for (q = p; q != NULL; q = q->next) {
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| 135 | for (i = 0; i < q->len; i++) {
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| 136 | c = ((u8_t *)q->payload)[i];
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| 137 | switch (c) {
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| 138 | case SLIP_END:
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| 139 | /* need to escape this byte (0xC0 -> 0xDB, 0xDC) */
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| 140 | sio_send(SLIP_ESC, priv->sd);
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| 141 | sio_send(SLIP_ESC_END, priv->sd);
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| 142 | break;
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| 143 | case SLIP_ESC:
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| 144 | /* need to escape this byte (0xDB -> 0xDB, 0xDD) */
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| 145 | sio_send(SLIP_ESC, priv->sd);
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| 146 | sio_send(SLIP_ESC_ESC, priv->sd);
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| 147 | break;
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| 148 | default:
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| 149 | /* normal byte - no need for escaping */
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| 150 | sio_send(c, priv->sd);
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| 151 | break;
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| 152 | }
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| 153 | }
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| 154 | }
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| 155 | /* End with packet delimiter. */
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| 156 | sio_send(SLIP_END, priv->sd);
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| 157 | return ERR_OK;
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| 158 | }
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| 159 |
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| 160 | #if LWIP_IPV4
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| 161 | /**
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| 162 | * Send a pbuf doing the necessary SLIP encapsulation
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| 163 | *
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| 164 | * Uses the serial layer's sio_send()
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| 165 | *
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| 166 | * @param netif the lwip network interface structure for this slipif
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| 167 | * @param p the pbuf chain packet to send
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| 168 | * @param ipaddr the ip address to send the packet to (not used for slipif)
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| 169 | * @return always returns ERR_OK since the serial layer does not provide return values
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| 170 | */
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| 171 | static err_t
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| 172 | slipif_output_v4(struct netif *netif, struct pbuf *p, const ip4_addr_t *ipaddr)
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| 173 | {
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| 174 | LWIP_UNUSED_ARG(ipaddr);
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| 175 | return slipif_output(netif, p);
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| 176 | }
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| 177 | #endif /* LWIP_IPV4 */
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| 178 |
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| 179 | #if LWIP_IPV6
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| 180 | /**
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| 181 | * Send a pbuf doing the necessary SLIP encapsulation
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| 182 | *
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| 183 | * Uses the serial layer's sio_send()
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| 184 | *
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| 185 | * @param netif the lwip network interface structure for this slipif
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| 186 | * @param p the pbuf chain packet to send
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| 187 | * @param ipaddr the ip address to send the packet to (not used for slipif)
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| 188 | * @return always returns ERR_OK since the serial layer does not provide return values
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| 189 | */
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| 190 | static err_t
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| 191 | slipif_output_v6(struct netif *netif, struct pbuf *p, const ip6_addr_t *ipaddr)
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| 192 | {
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| 193 | LWIP_UNUSED_ARG(ipaddr);
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| 194 | return slipif_output(netif, p);
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| 195 | }
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| 196 | #endif /* LWIP_IPV6 */
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| 197 |
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| 198 | /**
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| 199 | * Handle the incoming SLIP stream character by character
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| 200 | *
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| 201 | * @param netif the lwip network interface structure for this slipif
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| 202 | * @param c received character (multiple calls to this function will
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| 203 | * return a complete packet, NULL is returned before - used for polling)
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| 204 | * @return The IP packet when SLIP_END is received
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| 205 | */
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| 206 | static struct pbuf *
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| 207 | slipif_rxbyte(struct netif *netif, u8_t c)
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| 208 | {
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| 209 | struct slipif_priv *priv;
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| 210 | struct pbuf *t;
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| 211 |
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| 212 | LWIP_ASSERT("netif != NULL", (netif != NULL));
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| 213 | LWIP_ASSERT("netif->state != NULL", (netif->state != NULL));
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| 214 |
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| 215 | priv = (struct slipif_priv *)netif->state;
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| 216 |
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| 217 | switch (priv->state) {
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| 218 | case SLIP_RECV_NORMAL:
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| 219 | switch (c) {
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| 220 | case SLIP_END:
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| 221 | if (priv->recved > 0) {
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| 222 | /* Received whole packet. */
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| 223 | /* Trim the pbuf to the size of the received packet. */
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| 224 | pbuf_realloc(priv->q, priv->recved);
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| 225 |
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| 226 | LINK_STATS_INC(link.recv);
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| 227 |
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| 228 | LWIP_DEBUGF(SLIP_DEBUG, ("slipif: Got packet (%"U16_F" bytes)\n", priv->recved));
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| 229 | t = priv->q;
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| 230 | priv->p = priv->q = NULL;
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| 231 | priv->i = priv->recved = 0;
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| 232 | return t;
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| 233 | }
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| 234 | return NULL;
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| 235 | case SLIP_ESC:
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| 236 | priv->state = SLIP_RECV_ESCAPE;
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| 237 | return NULL;
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| 238 | default:
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| 239 | break;
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| 240 | } /* end switch (c) */
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| 241 | break;
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| 242 | case SLIP_RECV_ESCAPE:
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| 243 | /* un-escape END or ESC bytes, leave other bytes
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| 244 | (although that would be a protocol error) */
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| 245 | switch (c) {
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| 246 | case SLIP_ESC_END:
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| 247 | c = SLIP_END;
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| 248 | break;
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| 249 | case SLIP_ESC_ESC:
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| 250 | c = SLIP_ESC;
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| 251 | break;
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| 252 | default:
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| 253 | break;
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| 254 | }
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| 255 | priv->state = SLIP_RECV_NORMAL;
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| 256 | break;
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| 257 | default:
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| 258 | break;
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| 259 | } /* end switch (priv->state) */
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| 260 |
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| 261 | /* byte received, packet not yet completely received */
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| 262 | if (priv->p == NULL) {
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| 263 | /* allocate a new pbuf */
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| 264 | LWIP_DEBUGF(SLIP_DEBUG, ("slipif_input: alloc\n"));
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| 265 | priv->p = pbuf_alloc(PBUF_LINK, (PBUF_POOL_BUFSIZE - PBUF_LINK_HLEN - PBUF_LINK_ENCAPSULATION_HLEN), PBUF_POOL);
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| 266 |
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| 267 | if (priv->p == NULL) {
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| 268 | LINK_STATS_INC(link.drop);
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| 269 | LWIP_DEBUGF(SLIP_DEBUG, ("slipif_input: no new pbuf! (DROP)\n"));
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| 270 | /* don't process any further since we got no pbuf to receive to */
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| 271 | return NULL;
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| 272 | }
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| 273 |
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| 274 | if (priv->q != NULL) {
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| 275 | /* 'chain' the pbuf to the existing chain */
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| 276 | pbuf_cat(priv->q, priv->p);
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| 277 | } else {
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| 278 | /* p is the first pbuf in the chain */
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| 279 | priv->q = priv->p;
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| 280 | }
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| 281 | }
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| 282 |
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| 283 | /* this automatically drops bytes if > SLIP_MAX_SIZE */
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| 284 | if ((priv->p != NULL) && (priv->recved <= SLIP_MAX_SIZE)) {
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| 285 | ((u8_t *)priv->p->payload)[priv->i] = c;
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| 286 | priv->recved++;
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| 287 | priv->i++;
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| 288 | if (priv->i >= priv->p->len) {
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| 289 | /* on to the next pbuf */
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| 290 | priv->i = 0;
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| 291 | if (priv->p->next != NULL && priv->p->next->len > 0) {
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| 292 | /* p is a chain, on to the next in the chain */
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| 293 | priv->p = priv->p->next;
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| 294 | } else {
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| 295 | /* p is a single pbuf, set it to NULL so next time a new
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| 296 | * pbuf is allocated */
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| 297 | priv->p = NULL;
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| 298 | }
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| 299 | }
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| 300 | }
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| 301 | return NULL;
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| 302 | }
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| 303 |
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| 304 | /** Like slipif_rxbyte, but passes completed packets to netif->input
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| 305 | *
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| 306 | * @param netif The lwip network interface structure for this slipif
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| 307 | * @param c received character
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| 308 | */
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| 309 | static void
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| 310 | slipif_rxbyte_input(struct netif *netif, u8_t c)
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| 311 | {
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| 312 | struct pbuf *p;
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| 313 | p = slipif_rxbyte(netif, c);
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| 314 | if (p != NULL) {
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| 315 | if (netif->input(p, netif) != ERR_OK) {
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| 316 | pbuf_free(p);
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| 317 | }
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| 318 | }
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| 319 | }
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| 320 |
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| 321 | #if SLIP_USE_RX_THREAD
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| 322 | /**
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| 323 | * The SLIP input thread.
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| 324 | *
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| 325 | * Feed the IP layer with incoming packets
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| 326 | *
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| 327 | * @param nf the lwip network interface structure for this slipif
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| 328 | */
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| 329 | static void
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| 330 | slipif_loop_thread(void *nf)
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| 331 | {
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| 332 | u8_t c;
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| 333 | struct netif *netif = (struct netif *)nf;
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| 334 | struct slipif_priv *priv = (struct slipif_priv *)netif->state;
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| 335 |
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| 336 | while (1) {
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| 337 | if (sio_read(priv->sd, &c, 1) > 0) {
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| 338 | slipif_rxbyte_input(netif, c);
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| 339 | }
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| 340 | }
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| 341 | }
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| 342 | #endif /* SLIP_USE_RX_THREAD */
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| 343 |
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| 344 | /**
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| 345 | * @ingroup slipif
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| 346 | * SLIP netif initialization
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| 347 | *
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| 348 | * Call the arch specific sio_open and remember
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| 349 | * the opened device in the state field of the netif.
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| 350 | *
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| 351 | * @param netif the lwip network interface structure for this slipif
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| 352 | * @return ERR_OK if serial line could be opened,
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| 353 | * ERR_MEM if no memory could be allocated,
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| 354 | * ERR_IF is serial line couldn't be opened
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| 355 | *
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| 356 | * @note If netif->state is interpreted as an u8_t serial port number.
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| 357 | *
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| 358 | */
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| 359 | err_t
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| 360 | slipif_init(struct netif *netif)
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| 361 | {
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| 362 | struct slipif_priv *priv;
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| 363 | u8_t sio_num;
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| 364 |
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| 365 | LWIP_ASSERT("slipif needs an input callback", netif->input != NULL);
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| 366 |
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| 367 | /* netif->state contains serial port number */
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| 368 | sio_num = LWIP_PTR_NUMERIC_CAST(u8_t, netif->state);
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| 369 |
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| 370 | LWIP_DEBUGF(SLIP_DEBUG, ("slipif_init: netif->num=%"U16_F"\n", (u16_t)sio_num));
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| 371 |
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| 372 | /* Allocate private data */
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| 373 | priv = (struct slipif_priv *)mem_malloc(sizeof(struct slipif_priv));
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| 374 | if (!priv) {
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| 375 | return ERR_MEM;
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| 376 | }
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| 377 |
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| 378 | netif->name[0] = 's';
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| 379 | netif->name[1] = 'l';
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| 380 | #if LWIP_IPV4
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| 381 | netif->output = slipif_output_v4;
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| 382 | #endif /* LWIP_IPV4 */
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| 383 | #if LWIP_IPV6
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| 384 | netif->output_ip6 = slipif_output_v6;
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| 385 | #endif /* LWIP_IPV6 */
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| 386 | netif->mtu = SLIP_MAX_SIZE;
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| 387 |
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| 388 | /* Try to open the serial port. */
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| 389 | priv->sd = sio_open(sio_num);
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| 390 | if (!priv->sd) {
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| 391 | /* Opening the serial port failed. */
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| 392 | mem_free(priv);
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| 393 | return ERR_IF;
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| 394 | }
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| 395 |
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| 396 | /* Initialize private data */
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| 397 | priv->p = NULL;
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| 398 | priv->q = NULL;
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| 399 | priv->state = SLIP_RECV_NORMAL;
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| 400 | priv->i = 0;
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| 401 | priv->recved = 0;
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| 402 | #if SLIP_RX_FROM_ISR
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| 403 | priv->rxpackets = NULL;
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| 404 | #endif
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| 405 |
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| 406 | netif->state = priv;
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| 407 |
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| 408 | /* initialize the snmp variables and counters inside the struct netif */
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| 409 | MIB2_INIT_NETIF(netif, snmp_ifType_slip, SLIP_SIO_SPEED(priv->sd));
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| 410 |
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| 411 | #if SLIP_USE_RX_THREAD
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| 412 | /* Create a thread to poll the serial line. */
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| 413 | sys_thread_new(SLIPIF_THREAD_NAME, slipif_loop_thread, netif,
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| 414 | SLIPIF_THREAD_STACKSIZE, SLIPIF_THREAD_PRIO);
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| 415 | #endif /* SLIP_USE_RX_THREAD */
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| 416 | return ERR_OK;
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| 417 | }
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| 418 |
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| 419 | /**
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| 420 | * @ingroup slipif
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| 421 | * Polls the serial device and feeds the IP layer with incoming packets.
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| 422 | *
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| 423 | * @param netif The lwip network interface structure for this slipif
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| 424 | */
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| 425 | void
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| 426 | slipif_poll(struct netif *netif)
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| 427 | {
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| 428 | u8_t c;
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| 429 | struct slipif_priv *priv;
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| 430 |
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| 431 | LWIP_ASSERT("netif != NULL", (netif != NULL));
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| 432 | LWIP_ASSERT("netif->state != NULL", (netif->state != NULL));
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| 433 |
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| 434 | priv = (struct slipif_priv *)netif->state;
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| 435 |
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| 436 | while (sio_tryread(priv->sd, &c, 1) > 0) {
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| 437 | slipif_rxbyte_input(netif, c);
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| 438 | }
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| 439 | }
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| 440 |
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| 441 | #if SLIP_RX_FROM_ISR
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| 442 | /**
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| 443 | * @ingroup slipif
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| 444 | * Feeds the IP layer with incoming packets that were receive
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| 445 | *
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| 446 | * @param netif The lwip network interface structure for this slipif
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| 447 | */
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| 448 | void
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| 449 | slipif_process_rxqueue(struct netif *netif)
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| 450 | {
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| 451 | struct slipif_priv *priv;
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| 452 | SYS_ARCH_DECL_PROTECT(old_level);
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| 453 |
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| 454 | LWIP_ASSERT("netif != NULL", (netif != NULL));
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| 455 | LWIP_ASSERT("netif->state != NULL", (netif->state != NULL));
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| 456 |
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| 457 | priv = (struct slipif_priv *)netif->state;
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| 458 |
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| 459 | SYS_ARCH_PROTECT(old_level);
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| 460 | while (priv->rxpackets != NULL) {
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| 461 | struct pbuf *p = priv->rxpackets;
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| 462 | #if SLIP_RX_QUEUE
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| 463 | /* dequeue packet */
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| 464 | struct pbuf *q = p;
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| 465 | while ((q->len != q->tot_len) && (q->next != NULL)) {
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| 466 | q = q->next;
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| 467 | }
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| 468 | priv->rxpackets = q->next;
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| 469 | q->next = NULL;
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| 470 | #else /* SLIP_RX_QUEUE */
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| 471 | priv->rxpackets = NULL;
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| 472 | #endif /* SLIP_RX_QUEUE */
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| 473 | SYS_ARCH_UNPROTECT(old_level);
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| 474 | if (netif->input(p, netif) != ERR_OK) {
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| 475 | pbuf_free(p);
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| 476 | }
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| 477 | SYS_ARCH_PROTECT(old_level);
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| 478 | }
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| 479 | SYS_ARCH_UNPROTECT(old_level);
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| 480 | }
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| 481 |
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| 482 | /** Like slipif_rxbyte, but queues completed packets.
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| 483 | *
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| 484 | * @param netif The lwip network interface structure for this slipif
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| 485 | * @param data Received serial byte
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| 486 | */
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| 487 | static void
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| 488 | slipif_rxbyte_enqueue(struct netif *netif, u8_t data)
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| 489 | {
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| 490 | struct pbuf *p;
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| 491 | struct slipif_priv *priv = (struct slipif_priv *)netif->state;
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| 492 | SYS_ARCH_DECL_PROTECT(old_level);
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| 493 |
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| 494 | p = slipif_rxbyte(netif, data);
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| 495 | if (p != NULL) {
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| 496 | SYS_ARCH_PROTECT(old_level);
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| 497 | if (priv->rxpackets != NULL) {
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| 498 | #if SLIP_RX_QUEUE
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| 499 | /* queue multiple pbufs */
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| 500 | struct pbuf *q = p;
|
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| 501 | while (q->next != NULL) {
|
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| 502 | q = q->next;
|
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| 503 | }
|
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| 504 | q->next = p;
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| 505 | } else {
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| 506 | #else /* SLIP_RX_QUEUE */
|
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| 507 | pbuf_free(priv->rxpackets);
|
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| 508 | }
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| 509 | {
|
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| 510 | #endif /* SLIP_RX_QUEUE */
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| 511 | priv->rxpackets = p;
|
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| 512 | }
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| 513 | SYS_ARCH_UNPROTECT(old_level);
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| 514 | }
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| 515 | }
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| 516 |
|
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| 517 | /**
|
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| 518 | * @ingroup slipif
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| 519 | * Process a received byte, completed packets are put on a queue that is
|
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| 520 | * fed into IP through slipif_process_rxqueue().
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| 521 | *
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| 522 | * This function can be called from ISR if SYS_LIGHTWEIGHT_PROT is enabled.
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| 523 | *
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| 524 | * @param netif The lwip network interface structure for this slipif
|
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| 525 | * @param data received character
|
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| 526 | */
|
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| 527 | void
|
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| 528 | slipif_received_byte(struct netif *netif, u8_t data)
|
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| 529 | {
|
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| 530 | LWIP_ASSERT("netif != NULL", (netif != NULL));
|
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| 531 | LWIP_ASSERT("netif->state != NULL", (netif->state != NULL));
|
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| 532 | slipif_rxbyte_enqueue(netif, data);
|
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| 533 | }
|
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| 534 |
|
---|
| 535 | /**
|
---|
| 536 | * @ingroup slipif
|
---|
| 537 | * Process multiple received byte, completed packets are put on a queue that is
|
---|
| 538 | * fed into IP through slipif_process_rxqueue().
|
---|
| 539 | *
|
---|
| 540 | * This function can be called from ISR if SYS_LIGHTWEIGHT_PROT is enabled.
|
---|
| 541 | *
|
---|
| 542 | * @param netif The lwip network interface structure for this slipif
|
---|
| 543 | * @param data received character
|
---|
| 544 | * @param len Number of received characters
|
---|
| 545 | */
|
---|
| 546 | void
|
---|
| 547 | slipif_received_bytes(struct netif *netif, u8_t *data, u8_t len)
|
---|
| 548 | {
|
---|
| 549 | u8_t i;
|
---|
| 550 | u8_t *rxdata = data;
|
---|
| 551 | LWIP_ASSERT("netif != NULL", (netif != NULL));
|
---|
| 552 | LWIP_ASSERT("netif->state != NULL", (netif->state != NULL));
|
---|
| 553 |
|
---|
| 554 | for (i = 0; i < len; i++, rxdata++) {
|
---|
| 555 | slipif_rxbyte_enqueue(netif, *rxdata);
|
---|
| 556 | }
|
---|
| 557 | }
|
---|
| 558 | #endif /* SLIP_RX_FROM_ISR */
|
---|