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<a href="fpc__com__link_8c.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span>&#160;<span class="comment">/*</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span>&#160;<span class="comment"> * Copyright (c) 2020 Fingerprint Cards AB</span></div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span>&#160;<span class="comment"> *</span></div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span>&#160;<span class="comment"> * Licensed under the Apache License, Version 2.0 (the &quot;License&quot;);</span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span>&#160;<span class="comment"> * you may not use this file except in compliance with the License.</span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span>&#160;<span class="comment"> * You may obtain a copy of the License at</span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span>&#160;<span class="comment"> *</span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span>&#160;<span class="comment"> * https://www.apache.org/licenses/LICENSE-2.0</span></div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span>&#160;<span class="comment"> *</span></div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span>&#160;<span class="comment"> * Unless required by applicable law or agreed to in writing, software</span></div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span>&#160;<span class="comment"> * distributed under the License is distributed on an &quot;AS IS&quot; BASIS,</span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span>&#160;<span class="comment"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span></div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span>&#160;<span class="comment"> * See the License for the specific language governing permissions and</span></div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span>&#160;<span class="comment"> * limitations under the License.</span></div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span>&#160;<span class="comment"> */</span></div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span>&#160;</div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span>&#160;<span class="preprocessor">#include &lt;string.h&gt;</span></div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span>&#160;<span class="preprocessor">#include &lt;stdlib.h&gt;</span></div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span>&#160;</div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span>&#160;<span class="preprocessor">#include &quot;<a class="code" href="fpc__com__link_8h.html">fpc_com_link.h</a>&quot;</span></div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span>&#160;</div><div class="line"><a name="l00027"></a><span class="lineno"><a class="line" href="fpc__com__link_8c.html#a43a8a308255ea41e7b7cdefd63a90d14"> 27</a></span>&#160;<a class="code" href="fpc__com__result_8h.html#a49b1f9a24f677d396227ea645494070a">fpc_com_result_t</a> <a class="code" href="fpc__com__link_8c.html#a43a8a308255ea41e7b7cdefd63a90d14">fpc_com_link_transmit</a>(<a class="code" href="structfpc__com__packet__link.html">fpc_com_packet_link_t</a> *packet, <a class="code" href="structfpc__com__chain.html">fpc_com_chain_t</a> *chain)</div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span>&#160;{</div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span>&#160; uint32_t ack;</div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span>&#160; uint16_t size;</div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span>&#160; <a class="code" href="fpc__com__result_8h.html#a49b1f9a24f677d396227ea645494070a">fpc_com_result_t</a> result;</div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span>&#160;</div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span>&#160; <span class="keywordflow">if</span> (packet == NULL) {</div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span>&#160; result = <a class="code" href="fpc__com__result_8h.html#a5435902ad319b641b2758a2f8f48897aa2e96fad27e661c9eb3bce808d0d7e92e">FPC_COM_RESULT_INVALID_ARGUMENT</a>;</div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span>&#160; <span class="keywordflow">goto</span> exit;</div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span>&#160; }</div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span>&#160;</div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span>&#160; <span class="comment">/* Calculate CRC for payload */</span></div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span>&#160; packet-&gt;<a class="code" href="structfpc__com__packet__link.html#a2b36a249ee8d192688f2a5f3cce8cde4">crc</a> = chain-&gt;<a class="code" href="structfpc__com__chain.html#ac697aca7a789065170e24d18647df0e7">crc_calc</a>(0, packet-&gt;<a class="code" href="structfpc__com__packet__link.html#ac5412a399ecd825e331b560c1ec078fd">data</a>, packet-&gt;<a class="code" href="structfpc__com__packet__link.html#a7305e6e32039579c1258ccb42513049b">size</a>);</div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span>&#160;</div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span>&#160; <span class="comment">/* Get total size to be transfered over PHY layer */</span></div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span>&#160; size = packet-&gt;<a class="code" href="structfpc__com__packet__link.html#a7305e6e32039579c1258ccb42513049b">size</a> + <a class="code" href="fpc__com__link_8c.html#a3e60e21a5ac4ad4881e4929de2f3c2f4">fpc_com_link_get_overhead</a>(NULL);</div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span>&#160;</div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span>&#160; *((<a class="code" href="fpc__com__packets_8h.html#a243c6cf0a9ab056a1fce6430bb88c2d8">fpc_com_channel_t</a> *)chain-&gt;<a class="code" href="structfpc__com__chain.html#a63a02907c00e5443c7c3d4c0bd158d36">phy_mtu_buffer</a>[<a class="code" href="fpc__com__chain_8h.html#aed3b93f1297ab69d5bd87603d4d00005afe8870bc644ab21ffad73d3045febd4d">FPC_COM_CHAIN_TX</a>]) = packet-&gt;<a class="code" href="structfpc__com__packet__link.html#aa90708dd6d842b318723cb70d6939c2a">channel</a>;</div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span>&#160; *((uint16_t *)(chain-&gt;<a class="code" href="structfpc__com__chain.html#a63a02907c00e5443c7c3d4c0bd158d36">phy_mtu_buffer</a>[<a class="code" href="fpc__com__chain_8h.html#aed3b93f1297ab69d5bd87603d4d00005afe8870bc644ab21ffad73d3045febd4d">FPC_COM_CHAIN_TX</a>] + <span class="keyword">sizeof</span>(packet-&gt;<a class="code" href="structfpc__com__packet__link.html#aa90708dd6d842b318723cb70d6939c2a">channel</a>)))</div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span>&#160; = packet-&gt;<a class="code" href="structfpc__com__packet__link.html#a7305e6e32039579c1258ccb42513049b">size</a>;</div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span>&#160; <span class="comment">/* Copy CRC to PHY mtu buffer */</span></div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span>&#160; memcpy(packet-&gt;<a class="code" href="structfpc__com__packet__link.html#ac5412a399ecd825e331b560c1ec078fd">data</a> + packet-&gt;<a class="code" href="structfpc__com__packet__link.html#a7305e6e32039579c1258ccb42513049b">size</a>, &amp;packet-&gt;<a class="code" href="structfpc__com__packet__link.html#a2b36a249ee8d192688f2a5f3cce8cde4">crc</a>, <span class="keyword">sizeof</span>(packet-&gt;<a class="code" href="structfpc__com__packet__link.html#a2b36a249ee8d192688f2a5f3cce8cde4">crc</a>));</div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span>&#160;</div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span>&#160; <span class="comment">/* Send Packet */</span></div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span>&#160; result = chain-&gt;<a class="code" href="structfpc__com__chain.html#a67cdb9c412d3478b46f9091d094c4faf">phy_tx</a>(size, chain-&gt;<a class="code" href="structfpc__com__chain.html#a63a02907c00e5443c7c3d4c0bd158d36">phy_mtu_buffer</a>[<a class="code" href="fpc__com__chain_8h.html#aed3b93f1297ab69d5bd87603d4d00005afe8870bc644ab21ffad73d3045febd4d">FPC_COM_CHAIN_TX</a>], chain-&gt;<a class="code" href="structfpc__com__chain.html#a12a7599fb0f8ca779f6f5ac1df47bed2">phy_timeout_tx</a>,</div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span>&#160; chain-&gt;<a class="code" href="structfpc__com__chain.html#a92eac8623fea4a4134d073233d25a63f">session</a>);</div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span>&#160; <span class="keywordflow">if</span> (result != <a class="code" href="fpc__com__result_8h.html#a5435902ad319b641b2758a2f8f48897aaa4090b7c45045bce15b6b8d9cd7ef914">FPC_COM_RESULT_OK</a>) {</div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span>&#160; <span class="keywordflow">goto</span> exit;</div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span>&#160; }</div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span>&#160;</div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span>&#160; <span class="comment">/* Receive ACK */</span></div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span>&#160; result = chain-&gt;<a class="code" href="structfpc__com__chain.html#ae0e4aa33099bfc0c9910c7b6bb30f915">phy_rx</a>(<span class="keyword">sizeof</span>(ack), (uint8_t *)&amp;ack, chain-&gt;<a class="code" href="structfpc__com__chain.html#a2e3f88e744ac92baecf22b8be8b8bdb2">phy_timeout_rx</a>, chain-&gt;<a class="code" href="structfpc__com__chain.html#a92eac8623fea4a4134d073233d25a63f">session</a>);</div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span>&#160; <span class="comment">/* Handle no ack and timeout as IO error */</span></div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span>&#160; <span class="keywordflow">if</span> (ack != <a class="code" href="fpc__com__packets_8h.html#a4f4c239eb61e8e793498793c1be608f7">FPC_COM_ACK</a> || result == <a class="code" href="fpc__com__result_8h.html#a5435902ad319b641b2758a2f8f48897aa37ce8bdd82e871575b23e9f1d6f06dbf">FPC_COM_RESULT_TIMEOUT</a>) {</div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span>&#160; result = <a class="code" href="fpc__com__result_8h.html#a5435902ad319b641b2758a2f8f48897aa9018f4fe6916e76acf8f1a8391d9b80f">FPC_COM_RESULT_IO_ERROR</a>;</div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span>&#160; <span class="keywordflow">goto</span> exit;</div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span>&#160; }</div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span>&#160; <span class="comment">/* Handle rest as normal error */</span></div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span>&#160; <span class="keywordflow">if</span> (result != <a class="code" href="fpc__com__result_8h.html#a5435902ad319b641b2758a2f8f48897aaa4090b7c45045bce15b6b8d9cd7ef914">FPC_COM_RESULT_OK</a>) {</div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span>&#160; <span class="keywordflow">goto</span> exit;</div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span>&#160; }</div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span>&#160;</div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span>&#160;exit:</div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span>&#160; <span class="keywordflow">return</span> result;</div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span>&#160;}</div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span>&#160;</div><div class="line"><a name="l00073"></a><span class="lineno"><a class="line" href="fpc__com__link_8c.html#ae64b80cd91fbfe44abc06dc52eacf739"> 73</a></span>&#160;<a class="code" href="fpc__com__result_8h.html#a49b1f9a24f677d396227ea645494070a">fpc_com_result_t</a> <a class="code" href="fpc__com__link_8c.html#ae64b80cd91fbfe44abc06dc52eacf739">fpc_com_link_receive</a>(<a class="code" href="structfpc__com__packet__link.html">fpc_com_packet_link_t</a> *packet, <a class="code" href="structfpc__com__chain.html">fpc_com_chain_t</a> *chain)</div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span>&#160;{</div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span>&#160; <span class="keywordtype">bool</span> status;</div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span>&#160; uint32_t ack = <a class="code" href="fpc__com__packets_8h.html#a4f4c239eb61e8e793498793c1be608f7">FPC_COM_ACK</a>;</div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span>&#160; <span class="keyword">const</span> uint8_t header_size = <span class="keyword">sizeof</span>(packet-&gt;<a class="code" href="structfpc__com__packet__link.html#aa90708dd6d842b318723cb70d6939c2a">channel</a>) + <span class="keyword">sizeof</span>(packet-&gt;<a class="code" href="structfpc__com__packet__link.html#a7305e6e32039579c1258ccb42513049b">size</a>);</div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span>&#160; <a class="code" href="fpc__com__result_8h.html#a49b1f9a24f677d396227ea645494070a">fpc_com_result_t</a> result;</div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span>&#160;</div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span>&#160; <span class="keywordflow">if</span> (packet == NULL) {</div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span>&#160; result = <a class="code" href="fpc__com__result_8h.html#a5435902ad319b641b2758a2f8f48897aa2e96fad27e661c9eb3bce808d0d7e92e">FPC_COM_RESULT_INVALID_ARGUMENT</a>;</div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span>&#160; <span class="keywordflow">goto</span> exit;</div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span>&#160; }</div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span>&#160;</div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span>&#160; <span class="comment">/* Receive Header */</span></div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span>&#160; result = chain-&gt;<a class="code" href="structfpc__com__chain.html#ae0e4aa33099bfc0c9910c7b6bb30f915">phy_rx</a>(header_size, chain-&gt;<a class="code" href="structfpc__com__chain.html#a63a02907c00e5443c7c3d4c0bd158d36">phy_mtu_buffer</a>[<a class="code" href="fpc__com__chain_8h.html#aed3b93f1297ab69d5bd87603d4d00005aa50bc934637a1ceea907810ccdd36e1c">FPC_COM_CHAIN_RX</a>],</div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span>&#160; chain-&gt;<a class="code" href="structfpc__com__chain.html#a2e3f88e744ac92baecf22b8be8b8bdb2">phy_timeout_rx</a>, chain-&gt;<a class="code" href="structfpc__com__chain.html#a92eac8623fea4a4134d073233d25a63f">session</a>);</div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span>&#160; <span class="keywordflow">if</span> (result != <a class="code" href="fpc__com__result_8h.html#a5435902ad319b641b2758a2f8f48897aaa4090b7c45045bce15b6b8d9cd7ef914">FPC_COM_RESULT_OK</a>) {</div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span>&#160; <span class="keywordflow">goto</span> exit;</div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span>&#160; }</div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span>&#160;</div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span>&#160; packet-&gt;<a class="code" href="structfpc__com__packet__link.html#aa90708dd6d842b318723cb70d6939c2a">channel</a> = *((<a class="code" href="fpc__com__packets_8h.html#a243c6cf0a9ab056a1fce6430bb88c2d8">fpc_com_channel_t</a> *)chain-&gt;<a class="code" href="structfpc__com__chain.html#a63a02907c00e5443c7c3d4c0bd158d36">phy_mtu_buffer</a>[<a class="code" href="fpc__com__chain_8h.html#aed3b93f1297ab69d5bd87603d4d00005aa50bc934637a1ceea907810ccdd36e1c">FPC_COM_CHAIN_RX</a>]);</div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span>&#160; packet-&gt;<a class="code" href="structfpc__com__packet__link.html#a7305e6e32039579c1258ccb42513049b">size</a> = *((uint16_t *) (chain-&gt;<a class="code" href="structfpc__com__chain.html#a63a02907c00e5443c7c3d4c0bd158d36">phy_mtu_buffer</a>[<a class="code" href="fpc__com__chain_8h.html#aed3b93f1297ab69d5bd87603d4d00005aa50bc934637a1ceea907810ccdd36e1c">FPC_COM_CHAIN_RX</a>]</div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span>&#160; + <span class="keyword">sizeof</span>(<a class="code" href="fpc__com__packets_8h.html#a243c6cf0a9ab056a1fce6430bb88c2d8">fpc_com_channel_t</a>)));</div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span>&#160; packet-&gt;<a class="code" href="structfpc__com__packet__link.html#ac5412a399ecd825e331b560c1ec078fd">data</a> = chain-&gt;<a class="code" href="structfpc__com__chain.html#a63a02907c00e5443c7c3d4c0bd158d36">phy_mtu_buffer</a>[<a class="code" href="fpc__com__chain_8h.html#aed3b93f1297ab69d5bd87603d4d00005aa50bc934637a1ceea907810ccdd36e1c">FPC_COM_CHAIN_RX</a>] + header_size;</div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span>&#160;</div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span>&#160; <span class="comment">/* Check if packet size is valid */</span></div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span>&#160; <span class="keywordflow">if</span> (chain-&gt;<a class="code" href="structfpc__com__chain.html#ad135c2c04d54045141c2c3ffff09636d">phy_mtu_size</a>[<a class="code" href="fpc__com__chain_8h.html#aed3b93f1297ab69d5bd87603d4d00005aa50bc934637a1ceea907810ccdd36e1c">FPC_COM_CHAIN_RX</a>]</div><div class="line"><a name="l00099"></a><span class="lineno"> 99</span>&#160; &lt; (header_size + packet-&gt;<a class="code" href="structfpc__com__packet__link.html#a7305e6e32039579c1258ccb42513049b">size</a> + <span class="keyword">sizeof</span>(packet-&gt;<a class="code" href="structfpc__com__packet__link.html#a2b36a249ee8d192688f2a5f3cce8cde4">crc</a>))) {</div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span>&#160; result = <a class="code" href="fpc__com__result_8h.html#a5435902ad319b641b2758a2f8f48897aa9018f4fe6916e76acf8f1a8391d9b80f">FPC_COM_RESULT_IO_ERROR</a>;</div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span>&#160; <span class="keywordflow">goto</span> exit;</div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span>&#160; }</div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span>&#160;</div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span>&#160; <span class="comment">/* Receive Payload */</span></div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span>&#160; result = chain-&gt;<a class="code" href="structfpc__com__chain.html#ae0e4aa33099bfc0c9910c7b6bb30f915">phy_rx</a>(packet-&gt;<a class="code" href="structfpc__com__packet__link.html#a7305e6e32039579c1258ccb42513049b">size</a> + <span class="keyword">sizeof</span>(packet-&gt;<a class="code" href="structfpc__com__packet__link.html#a2b36a249ee8d192688f2a5f3cce8cde4">crc</a>), packet-&gt;<a class="code" href="structfpc__com__packet__link.html#ac5412a399ecd825e331b560c1ec078fd">data</a>,</div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span>&#160; chain-&gt;<a class="code" href="structfpc__com__chain.html#a2e3f88e744ac92baecf22b8be8b8bdb2">phy_timeout_rx</a>, chain-&gt;<a class="code" href="structfpc__com__chain.html#a92eac8623fea4a4134d073233d25a63f">session</a>);</div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span>&#160; <span class="keywordflow">if</span> (result != <a class="code" href="fpc__com__result_8h.html#a5435902ad319b641b2758a2f8f48897aaa4090b7c45045bce15b6b8d9cd7ef914">FPC_COM_RESULT_OK</a>) {</div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span>&#160; <span class="keywordflow">goto</span> exit;</div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span>&#160; }</div><div class="line"><a name="l00110"></a><span class="lineno"> 110</span>&#160;</div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span>&#160; <span class="comment">/* Check incoming packet CRC */</span></div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span>&#160; memcpy(&amp;packet-&gt;<a class="code" href="structfpc__com__packet__link.html#a2b36a249ee8d192688f2a5f3cce8cde4">crc</a>, packet-&gt;<a class="code" href="structfpc__com__packet__link.html#ac5412a399ecd825e331b560c1ec078fd">data</a> + packet-&gt;<a class="code" href="structfpc__com__packet__link.html#a7305e6e32039579c1258ccb42513049b">size</a>, <span class="keyword">sizeof</span>(packet-&gt;<a class="code" href="structfpc__com__packet__link.html#a2b36a249ee8d192688f2a5f3cce8cde4">crc</a>));</div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span>&#160; status = (packet-&gt;<a class="code" href="structfpc__com__packet__link.html#a2b36a249ee8d192688f2a5f3cce8cde4">crc</a> == chain-&gt;<a class="code" href="structfpc__com__chain.html#ac697aca7a789065170e24d18647df0e7">crc_calc</a>(0, packet-&gt;<a class="code" href="structfpc__com__packet__link.html#ac5412a399ecd825e331b560c1ec078fd">data</a>, packet-&gt;<a class="code" href="structfpc__com__packet__link.html#a7305e6e32039579c1258ccb42513049b">size</a>));</div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span>&#160; <span class="keywordflow">if</span> (!status) {</div><div class="line"><a name="l00115"></a><span class="lineno"> 115</span>&#160; result = <a class="code" href="fpc__com__result_8h.html#a5435902ad319b641b2758a2f8f48897aa9018f4fe6916e76acf8f1a8391d9b80f">FPC_COM_RESULT_IO_ERROR</a>;</div><div class="line"><a name="l00116"></a><span class="lineno"> 116</span>&#160; <span class="keywordflow">goto</span> exit;</div><div class="line"><a name="l00117"></a><span class="lineno"> 117</span>&#160; }</div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span>&#160;</div><div class="line"><a name="l00119"></a><span class="lineno"> 119</span>&#160; <span class="comment">/* Send ACK */</span></div><div class="line"><a name="l00120"></a><span class="lineno"> 120</span>&#160; result = chain-&gt;<a class="code" href="structfpc__com__chain.html#a67cdb9c412d3478b46f9091d094c4faf">phy_tx</a>(<span class="keyword">sizeof</span>(ack), (uint8_t *)&amp;ack, chain-&gt;<a class="code" href="structfpc__com__chain.html#a12a7599fb0f8ca779f6f5ac1df47bed2">phy_timeout_tx</a>, chain-&gt;<a class="code" href="structfpc__com__chain.html#a92eac8623fea4a4134d073233d25a63f">session</a>);</div><div class="line"><a name="l00121"></a><span class="lineno"> 121</span>&#160;</div><div class="line"><a name="l00122"></a><span class="lineno"> 122</span>&#160;exit:</div><div class="line"><a name="l00123"></a><span class="lineno"> 123</span>&#160; <span class="keywordflow">return</span> result;</div><div class="line"><a name="l00124"></a><span class="lineno"> 124</span>&#160;}</div><div class="line"><a name="l00125"></a><span class="lineno"> 125</span>&#160;</div><div class="line"><a name="l00126"></a><span class="lineno"><a class="line" href="fpc__com__link_8c.html#a3e60e21a5ac4ad4881e4929de2f3c2f4"> 126</a></span>&#160;uint16_t <a class="code" href="fpc__com__link_8c.html#a3e60e21a5ac4ad4881e4929de2f3c2f4">fpc_com_link_get_overhead</a>(uint16_t *offset)</div><div class="line"><a name="l00127"></a><span class="lineno"> 127</span>&#160;{</div><div class="line"><a name="l00128"></a><span class="lineno"> 128</span>&#160; <a class="code" href="structfpc__com__packet__link.html">fpc_com_packet_link_t</a> *packet;</div><div class="line"><a name="l00129"></a><span class="lineno"> 129</span>&#160; <span class="keyword">static</span> <span class="keyword">const</span> uint16_t internal_offset = <span class="keyword">sizeof</span>(packet-&gt;<a class="code" href="structfpc__com__packet__link.html#aa90708dd6d842b318723cb70d6939c2a">channel</a>) + <span class="keyword">sizeof</span>(packet-&gt;<a class="code" href="structfpc__com__packet__link.html#a7305e6e32039579c1258ccb42513049b">size</a>);</div><div class="line"><a name="l00130"></a><span class="lineno"> 130</span>&#160;</div><div class="line"><a name="l00131"></a><span class="lineno"> 131</span>&#160; <span class="keywordflow">if</span> (offset) {</div><div class="line"><a name="l00132"></a><span class="lineno"> 132</span>&#160; *offset = internal_offset;</div><div class="line"><a name="l00133"></a><span class="lineno"> 133</span>&#160; }</div><div class="line"><a name="l00134"></a><span class="lineno"> 134</span>&#160; <span class="keywordflow">return</span> internal_offset + <span class="keyword">sizeof</span>(packet-&gt;<a class="code" href="structfpc__com__packet__link.html#a2b36a249ee8d192688f2a5f3cce8cde4">crc</a>);</div><div class="line"><a name="l00135"></a><span class="lineno"> 135</span>&#160;}</div><div class="ttc" id="fpc__com__link_8c_html_a43a8a308255ea41e7b7cdefd63a90d14"><div class="ttname"><a href="fpc__com__link_8c.html#a43a8a308255ea41e7b7cdefd63a90d14">fpc_com_link_transmit</a></div><div class="ttdeci">fpc_com_result_t fpc_com_link_transmit(fpc_com_packet_link_t *packet, fpc_com_chain_t *chain)</div><div class="ttdoc">Sends a packet over the physical link in blocking mode. </div><div class="ttdef"><b>Definition:</b> <a href="fpc__com__link_8c_source.html#l00027">fpc_com_link.c:27</a></div></div>
<div class="ttc" id="fpc__com__result_8h_html_a5435902ad319b641b2758a2f8f48897aa9018f4fe6916e76acf8f1a8391d9b80f"><div class="ttname"><a href="fpc__com__result_8h.html#a5435902ad319b641b2758a2f8f48897aa9018f4fe6916e76acf8f1a8391d9b80f">FPC_COM_RESULT_IO_ERROR</a></div><div class="ttdef"><b>Definition:</b> <a href="fpc__com__result_8h_source.html#l00037">fpc_com_result.h:37</a></div></div>
<div class="ttc" id="structfpc__com__chain_html_a63a02907c00e5443c7c3d4c0bd158d36"><div class="ttname"><a href="structfpc__com__chain.html#a63a02907c00e5443c7c3d4c0bd158d36">fpc_com_chain::phy_mtu_buffer</a></div><div class="ttdeci">uint8_t * phy_mtu_buffer[2]</div><div class="ttdef"><b>Definition:</b> <a href="fpc__com__chain_8h_source.html#l00121">fpc_com_chain.h:121</a></div></div>
<div class="ttc" id="structfpc__com__chain_html_ad135c2c04d54045141c2c3ffff09636d"><div class="ttname"><a href="structfpc__com__chain.html#ad135c2c04d54045141c2c3ffff09636d">fpc_com_chain::phy_mtu_size</a></div><div class="ttdeci">uint16_t phy_mtu_size[2]</div><div class="ttdef"><b>Definition:</b> <a href="fpc__com__chain_8h_source.html#l00119">fpc_com_chain.h:119</a></div></div>
<div class="ttc" id="structfpc__com__chain_html"><div class="ttname"><a href="structfpc__com__chain.html">fpc_com_chain</a></div><div class="ttdef"><b>Definition:</b> <a href="fpc__com__chain_8h_source.html#l00050">fpc_com_chain.h:50</a></div></div>
<div class="ttc" id="fpc__com__chain_8h_html_aed3b93f1297ab69d5bd87603d4d00005afe8870bc644ab21ffad73d3045febd4d"><div class="ttname"><a href="fpc__com__chain_8h.html#aed3b93f1297ab69d5bd87603d4d00005afe8870bc644ab21ffad73d3045febd4d">FPC_COM_CHAIN_TX</a></div><div class="ttdef"><b>Definition:</b> <a href="fpc__com__chain_8h_source.html#l00150">fpc_com_chain.h:150</a></div></div>
<div class="ttc" id="structfpc__com__chain_html_ae0e4aa33099bfc0c9910c7b6bb30f915"><div class="ttname"><a href="structfpc__com__chain.html#ae0e4aa33099bfc0c9910c7b6bb30f915">fpc_com_chain::phy_rx</a></div><div class="ttdeci">fpc_com_result_t(* phy_rx)(uint16_t size, uint8_t *buffer, uint32_t timeout, void *session)</div><div class="ttdef"><b>Definition:</b> <a href="fpc__com__chain_8h_source.html#l00116">fpc_com_chain.h:116</a></div></div>
<div class="ttc" id="structfpc__com__chain_html_a12a7599fb0f8ca779f6f5ac1df47bed2"><div class="ttname"><a href="structfpc__com__chain.html#a12a7599fb0f8ca779f6f5ac1df47bed2">fpc_com_chain::phy_timeout_tx</a></div><div class="ttdeci">uint32_t phy_timeout_tx</div><div class="ttdef"><b>Definition:</b> <a href="fpc__com__chain_8h_source.html#l00123">fpc_com_chain.h:123</a></div></div>
<div class="ttc" id="fpc__com__result_8h_html_a5435902ad319b641b2758a2f8f48897aa37ce8bdd82e871575b23e9f1d6f06dbf"><div class="ttname"><a href="fpc__com__result_8h.html#a5435902ad319b641b2758a2f8f48897aa37ce8bdd82e871575b23e9f1d6f06dbf">FPC_COM_RESULT_TIMEOUT</a></div><div class="ttdef"><b>Definition:</b> <a href="fpc__com__result_8h_source.html#l00038">fpc_com_result.h:38</a></div></div>
<div class="ttc" id="structfpc__com__chain_html_a92eac8623fea4a4134d073233d25a63f"><div class="ttname"><a href="structfpc__com__chain.html#a92eac8623fea4a4134d073233d25a63f">fpc_com_chain::session</a></div><div class="ttdeci">void * session</div><div class="ttdoc">User session pointer. User private stuff, to be able to pass necessary info from the layer that calls...</div><div class="ttdef"><b>Definition:</b> <a href="fpc__com__chain_8h_source.html#l00137">fpc_com_chain.h:137</a></div></div>
<div class="ttc" id="structfpc__com__packet__link_html_a7305e6e32039579c1258ccb42513049b"><div class="ttname"><a href="structfpc__com__packet__link.html#a7305e6e32039579c1258ccb42513049b">fpc_com_packet_link::size</a></div><div class="ttdeci">uint16_t size</div><div class="ttdef"><b>Definition:</b> <a href="fpc__com__packets_8h_source.html#l00065">fpc_com_packets.h:65</a></div></div>
<div class="ttc" id="fpc__com__result_8h_html_a5435902ad319b641b2758a2f8f48897aa2e96fad27e661c9eb3bce808d0d7e92e"><div class="ttname"><a href="fpc__com__result_8h.html#a5435902ad319b641b2758a2f8f48897aa2e96fad27e661c9eb3bce808d0d7e92e">FPC_COM_RESULT_INVALID_ARGUMENT</a></div><div class="ttdef"><b>Definition:</b> <a href="fpc__com__result_8h_source.html#l00035">fpc_com_result.h:35</a></div></div>
<div class="ttc" id="structfpc__com__packet__link_html_ac5412a399ecd825e331b560c1ec078fd"><div class="ttname"><a href="structfpc__com__packet__link.html#ac5412a399ecd825e331b560c1ec078fd">fpc_com_packet_link::data</a></div><div class="ttdeci">uint8_t * data</div><div class="ttdef"><b>Definition:</b> <a href="fpc__com__packets_8h_source.html#l00067">fpc_com_packets.h:67</a></div></div>
<div class="ttc" id="structfpc__com__chain_html_ac697aca7a789065170e24d18647df0e7"><div class="ttname"><a href="structfpc__com__chain.html#ac697aca7a789065170e24d18647df0e7">fpc_com_chain::crc_calc</a></div><div class="ttdeci">uint32_t(* crc_calc)(uint32_t start, const void *data, uint32_t size)</div><div class="ttdef"><b>Definition:</b> <a href="fpc__com__chain_8h_source.html#l00066">fpc_com_chain.h:66</a></div></div>
<div class="ttc" id="fpc__com__packets_8h_html_a4f4c239eb61e8e793498793c1be608f7"><div class="ttname"><a href="fpc__com__packets_8h.html#a4f4c239eb61e8e793498793c1be608f7">FPC_COM_ACK</a></div><div class="ttdeci">#define FPC_COM_ACK</div><div class="ttdef"><b>Definition:</b> <a href="fpc__com__packets_8h_source.html#l00032">fpc_com_packets.h:32</a></div></div>
<div class="ttc" id="fpc__com__link_8c_html_a3e60e21a5ac4ad4881e4929de2f3c2f4"><div class="ttname"><a href="fpc__com__link_8c.html#a3e60e21a5ac4ad4881e4929de2f3c2f4">fpc_com_link_get_overhead</a></div><div class="ttdeci">uint16_t fpc_com_link_get_overhead(uint16_t *offset)</div><div class="ttdoc">Returns the overhead of the layer. </div><div class="ttdef"><b>Definition:</b> <a href="fpc__com__link_8c_source.html#l00126">fpc_com_link.c:126</a></div></div>
<div class="ttc" id="structfpc__com__chain_html_a67cdb9c412d3478b46f9091d094c4faf"><div class="ttname"><a href="structfpc__com__chain.html#a67cdb9c412d3478b46f9091d094c4faf">fpc_com_chain::phy_tx</a></div><div class="ttdeci">fpc_com_result_t(* phy_tx)(uint16_t size, const uint8_t *buffer, uint32_t timeout, void *session)</div><div class="ttdef"><b>Definition:</b> <a href="fpc__com__chain_8h_source.html#l00113">fpc_com_chain.h:113</a></div></div>
<div class="ttc" id="structfpc__com__chain_html_a2e3f88e744ac92baecf22b8be8b8bdb2"><div class="ttname"><a href="structfpc__com__chain.html#a2e3f88e744ac92baecf22b8be8b8bdb2">fpc_com_chain::phy_timeout_rx</a></div><div class="ttdeci">uint32_t phy_timeout_rx</div><div class="ttdef"><b>Definition:</b> <a href="fpc__com__chain_8h_source.html#l00125">fpc_com_chain.h:125</a></div></div>
<div class="ttc" id="fpc__com__chain_8h_html_aed3b93f1297ab69d5bd87603d4d00005aa50bc934637a1ceea907810ccdd36e1c"><div class="ttname"><a href="fpc__com__chain_8h.html#aed3b93f1297ab69d5bd87603d4d00005aa50bc934637a1ceea907810ccdd36e1c">FPC_COM_CHAIN_RX</a></div><div class="ttdef"><b>Definition:</b> <a href="fpc__com__chain_8h_source.html#l00151">fpc_com_chain.h:151</a></div></div>
<div class="ttc" id="structfpc__com__packet__link_html_aa90708dd6d842b318723cb70d6939c2a"><div class="ttname"><a href="structfpc__com__packet__link.html#aa90708dd6d842b318723cb70d6939c2a">fpc_com_packet_link::channel</a></div><div class="ttdeci">fpc_com_channel_t channel</div><div class="ttdef"><b>Definition:</b> <a href="fpc__com__packets_8h_source.html#l00063">fpc_com_packets.h:63</a></div></div>
<div class="ttc" id="fpc__com__result_8h_html_a49b1f9a24f677d396227ea645494070a"><div class="ttname"><a href="fpc__com__result_8h.html#a49b1f9a24f677d396227ea645494070a">fpc_com_result_t</a></div><div class="ttdeci">uint8_t fpc_com_result_t</div><div class="ttdef"><b>Definition:</b> <a href="fpc__com__result_8h_source.html#l00041">fpc_com_result.h:41</a></div></div>
<div class="ttc" id="structfpc__com__packet__link_html_a2b36a249ee8d192688f2a5f3cce8cde4"><div class="ttname"><a href="structfpc__com__packet__link.html#a2b36a249ee8d192688f2a5f3cce8cde4">fpc_com_packet_link::crc</a></div><div class="ttdeci">uint32_t crc</div><div class="ttdef"><b>Definition:</b> <a href="fpc__com__packets_8h_source.html#l00069">fpc_com_packets.h:69</a></div></div>
<div class="ttc" id="fpc__com__packets_8h_html_a243c6cf0a9ab056a1fce6430bb88c2d8"><div class="ttname"><a href="fpc__com__packets_8h.html#a243c6cf0a9ab056a1fce6430bb88c2d8">fpc_com_channel_t</a></div><div class="ttdeci">uint16_t fpc_com_channel_t</div><div class="ttdef"><b>Definition:</b> <a href="fpc__com__packets_8h_source.html#l00058">fpc_com_packets.h:58</a></div></div>
<div class="ttc" id="fpc__com__link_8h_html"><div class="ttname"><a href="fpc__com__link_8h.html">fpc_com_link.h</a></div><div class="ttdoc">Communication link interface. </div></div>
<div class="ttc" id="fpc__com__link_8c_html_ae64b80cd91fbfe44abc06dc52eacf739"><div class="ttname"><a href="fpc__com__link_8c.html#ae64b80cd91fbfe44abc06dc52eacf739">fpc_com_link_receive</a></div><div class="ttdeci">fpc_com_result_t fpc_com_link_receive(fpc_com_packet_link_t *packet, fpc_com_chain_t *chain)</div><div class="ttdoc">Receives a packet from the physical link. </div><div class="ttdef"><b>Definition:</b> <a href="fpc__com__link_8c_source.html#l00073">fpc_com_link.c:73</a></div></div>
<div class="ttc" id="fpc__com__result_8h_html_a5435902ad319b641b2758a2f8f48897aaa4090b7c45045bce15b6b8d9cd7ef914"><div class="ttname"><a href="fpc__com__result_8h.html#a5435902ad319b641b2758a2f8f48897aaa4090b7c45045bce15b6b8d9cd7ef914">FPC_COM_RESULT_OK</a></div><div class="ttdef"><b>Definition:</b> <a href="fpc__com__result_8h_source.html#l00033">fpc_com_result.h:33</a></div></div>
<div class="ttc" id="structfpc__com__packet__link_html"><div class="ttname"><a href="structfpc__com__packet__link.html">fpc_com_packet_link</a></div><div class="ttdef"><b>Definition:</b> <a href="fpc__com__packets_8h_source.html#l00061">fpc_com_packets.h:61</a></div></div>
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