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1 | office | 1 | /** |
2 | * @file |
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3 | * SLIP Interface |
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4 | * |
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5 | */ |
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6 | |||
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 | |||
41 | |||
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 | |||
62 | #include "netif/slipif.h" |
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63 | #include "lwip/opt.h" |
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64 | |||
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 | |||
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 | |||
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 | |||
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 | |||
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 | |||
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 | |||
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 | |||
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 | |||
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 | |||
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 | |||
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 | |||
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 | |||
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 | |||
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 | |||
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 | |||
215 | priv = (struct slipif_priv *)netif->state; |
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216 | |||
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 | |||
226 | LINK_STATS_INC(link.recv); |
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227 | |||
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 | |||
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 | |||
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 | |||
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 | |||
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 | |||
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 | |||
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 | |||
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 | |||
344 | /** |
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345 | * SLIP netif initialization |
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346 | * |
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347 | * Call the arch specific sio_open and remember |
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348 | * the opened device in the state field of the netif. |
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349 | * |
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350 | * @param netif the lwip network interface structure for this slipif |
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351 | * @return ERR_OK if serial line could be opened, |
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352 | * ERR_MEM if no memory could be allocated, |
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353 | * ERR_IF is serial line couldn't be opened |
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354 | * |
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355 | * @note If netif->state is interpreted as an u8_t serial port number. |
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356 | * |
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357 | */ |
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358 | err_t |
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359 | slipif_init(struct netif *netif) |
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360 | { |
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361 | struct slipif_priv *priv; |
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362 | u8_t sio_num; |
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363 | |||
364 | /* netif->state contains serial port number */ |
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365 | sio_num = LWIP_PTR_NUMERIC_CAST(u8_t, netif->state); |
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366 | |||
367 | LWIP_DEBUGF(SLIP_DEBUG, ("slipif_init: netif->num=%"U16_F"\n", (u16_t)sio_num)); |
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368 | |||
369 | /* Allocate private data */ |
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370 | priv = (struct slipif_priv *)mem_malloc(sizeof(struct slipif_priv)); |
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371 | if (!priv) { |
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372 | return ERR_MEM; |
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373 | } |
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374 | |||
375 | netif->name[0] = 's'; |
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376 | netif->name[1] = 'l'; |
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377 | #if LWIP_IPV4 |
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378 | netif->output = slipif_output_v4; |
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379 | #endif /* LWIP_IPV4 */ |
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380 | #if LWIP_IPV6 |
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381 | netif->output_ip6 = slipif_output_v6; |
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382 | #endif /* LWIP_IPV6 */ |
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383 | netif->mtu = SLIP_MAX_SIZE; |
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384 | |||
385 | /* Try to open the serial port. */ |
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386 | priv->sd = sio_open(sio_num); |
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387 | if (!priv->sd) { |
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388 | /* Opening the serial port failed. */ |
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389 | mem_free(priv); |
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390 | return ERR_IF; |
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391 | } |
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392 | |||
393 | /* Initialize private data */ |
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394 | priv->p = NULL; |
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395 | priv->q = NULL; |
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396 | priv->state = SLIP_RECV_NORMAL; |
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397 | priv->i = 0; |
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398 | priv->recved = 0; |
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399 | #if SLIP_RX_FROM_ISR |
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400 | priv->rxpackets = NULL; |
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401 | #endif |
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402 | |||
403 | netif->state = priv; |
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404 | |||
405 | /* initialize the snmp variables and counters inside the struct netif */ |
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406 | MIB2_INIT_NETIF(netif, snmp_ifType_slip, SLIP_SIO_SPEED(priv->sd)); |
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407 | |||
408 | #if SLIP_USE_RX_THREAD |
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409 | /* Create a thread to poll the serial line. */ |
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410 | sys_thread_new(SLIPIF_THREAD_NAME, slipif_loop_thread, netif, |
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411 | SLIPIF_THREAD_STACKSIZE, SLIPIF_THREAD_PRIO); |
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412 | #endif /* SLIP_USE_RX_THREAD */ |
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413 | return ERR_OK; |
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414 | } |
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415 | |||
416 | /** |
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417 | * Polls the serial device and feeds the IP layer with incoming packets. |
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418 | * |
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419 | * @param netif The lwip network interface structure for this slipif |
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420 | */ |
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421 | void |
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422 | slipif_poll(struct netif *netif) |
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423 | { |
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424 | u8_t c; |
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425 | struct slipif_priv *priv; |
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426 | |||
427 | LWIP_ASSERT("netif != NULL", (netif != NULL)); |
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428 | LWIP_ASSERT("netif->state != NULL", (netif->state != NULL)); |
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429 | |||
430 | priv = (struct slipif_priv *)netif->state; |
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431 | |||
432 | while (sio_tryread(priv->sd, &c, 1) > 0) { |
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433 | slipif_rxbyte_input(netif, c); |
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434 | } |
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435 | } |
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436 | |||
437 | #if SLIP_RX_FROM_ISR |
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438 | /** |
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439 | * Feeds the IP layer with incoming packets that were receive |
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440 | * |
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441 | * @param netif The lwip network interface structure for this slipif |
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442 | */ |
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443 | void |
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444 | slipif_process_rxqueue(struct netif *netif) |
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445 | { |
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446 | struct slipif_priv *priv; |
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447 | SYS_ARCH_DECL_PROTECT(old_level); |
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448 | |||
449 | LWIP_ASSERT("netif != NULL", (netif != NULL)); |
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450 | LWIP_ASSERT("netif->state != NULL", (netif->state != NULL)); |
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451 | |||
452 | priv = (struct slipif_priv *)netif->state; |
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453 | |||
454 | SYS_ARCH_PROTECT(old_level); |
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455 | while (priv->rxpackets != NULL) { |
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456 | struct pbuf *p = priv->rxpackets; |
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457 | #if SLIP_RX_QUEUE |
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458 | /* dequeue packet */ |
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459 | struct pbuf *q = p; |
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460 | while ((q->len != q->tot_len) && (q->next != NULL)) { |
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461 | q = q->next; |
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462 | } |
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463 | priv->rxpackets = q->next; |
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464 | q->next = NULL; |
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465 | #else /* SLIP_RX_QUEUE */ |
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466 | priv->rxpackets = NULL; |
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467 | #endif /* SLIP_RX_QUEUE */ |
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468 | SYS_ARCH_UNPROTECT(old_level); |
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469 | if (netif->input(p, netif) != ERR_OK) { |
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470 | pbuf_free(p); |
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471 | } |
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472 | SYS_ARCH_PROTECT(old_level); |
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473 | } |
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474 | } |
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475 | |||
476 | /** Like slipif_rxbyte, but queues completed packets. |
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477 | * |
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478 | * @param netif The lwip network interface structure for this slipif |
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479 | * @param data Received serial byte |
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480 | */ |
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481 | static void |
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482 | slipif_rxbyte_enqueue(struct netif *netif, u8_t data) |
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483 | { |
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484 | struct pbuf *p; |
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485 | struct slipif_priv *priv = (struct slipif_priv *)netif->state; |
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486 | SYS_ARCH_DECL_PROTECT(old_level); |
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487 | |||
488 | p = slipif_rxbyte(netif, data); |
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489 | if (p != NULL) { |
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490 | SYS_ARCH_PROTECT(old_level); |
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491 | if (priv->rxpackets != NULL) { |
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492 | #if SLIP_RX_QUEUE |
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493 | /* queue multiple pbufs */ |
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494 | struct pbuf *q = p; |
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495 | while (q->next != NULL) { |
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496 | q = q->next; |
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497 | } |
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498 | q->next = p; |
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499 | } else { |
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500 | #else /* SLIP_RX_QUEUE */ |
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501 | pbuf_free(priv->rxpackets); |
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502 | } |
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503 | { |
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504 | #endif /* SLIP_RX_QUEUE */ |
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505 | priv->rxpackets = p; |
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506 | } |
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507 | SYS_ARCH_UNPROTECT(old_level); |
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508 | } |
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509 | } |
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510 | |||
511 | /** |
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512 | * Process a received byte, completed packets are put on a queue that is |
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513 | * fed into IP through slipif_process_rxqueue(). |
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514 | * |
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515 | * This function can be called from ISR if SYS_LIGHTWEIGHT_PROT is enabled. |
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516 | * |
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517 | * @param netif The lwip network interface structure for this slipif |
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518 | * @param data received character |
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519 | */ |
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520 | void |
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521 | slipif_received_byte(struct netif *netif, u8_t data) |
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522 | { |
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523 | LWIP_ASSERT("netif != NULL", (netif != NULL)); |
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524 | LWIP_ASSERT("netif->state != NULL", (netif->state != NULL)); |
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525 | slipif_rxbyte_enqueue(netif, data); |
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526 | } |
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527 | |||
528 | /** |
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529 | * Process multiple received byte, completed packets are put on a queue that is |
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530 | * fed into IP through slipif_process_rxqueue(). |
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531 | * |
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532 | * This function can be called from ISR if SYS_LIGHTWEIGHT_PROT is enabled. |
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533 | * |
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534 | * @param netif The lwip network interface structure for this slipif |
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535 | * @param data received character |
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536 | * @param len Number of received characters |
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537 | */ |
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538 | void |
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539 | slipif_received_bytes(struct netif *netif, u8_t *data, u8_t len) |
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540 | { |
||
541 | u8_t i; |
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542 | u8_t *rxdata = data; |
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543 | LWIP_ASSERT("netif != NULL", (netif != NULL)); |
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544 | LWIP_ASSERT("netif->state != NULL", (netif->state != NULL)); |
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545 | |||
546 | for (i = 0; i < len; i++, rxdata++) { |
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547 | slipif_rxbyte_enqueue(netif, *rxdata); |
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548 | } |
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549 | } |
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550 | #endif /* SLIP_RX_FROM_ISR */ |