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