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<a href="1__stack_8md.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> \page stack FPC embedded stack</div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> </div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> The communication stack implemented on the embedded devices by FPC follows the following</div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> specification.</div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> </div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> \image html stack.svg "HCP embedded stack"</div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> \image latex stack.eps "HCP embedded stack"</div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> </div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> \section phy Physical</div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> </div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> The physical layer have a fixed size buffer of 256 bytes.</div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> </div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> \section link Link</div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> </div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> The link layer handles packet consistency.</div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> </div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> Each packet received is acknowledged on the link layer, if an error occurs no retransmission is</div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> done on this level, instead the error is propagated upwards.</div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span> </div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span> Channel | Size | Payload | CRC |</div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span> ------- | ------- | ---------- | ------- |</div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span> 2 bytes | 2 bytes | size bytes | 4 bytes |</div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span> </div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span> All fields are using unsigned data types.</div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span> </div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span> \section tsp Transport</div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span> </div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span> The transport layer handles packet segmentation.</div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span> </div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span> As the PHY MTU is 256 bytes the maximum payload per segment is 242 bytes.</div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span> </div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span> Errors are propagated upwards.</div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span> </div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span> Size | Seq Nr | Seq Len | Payload |</div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span> ------- | ------- | ------- | ---------- |</div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span> 2 bytes | 2 bytes | 2 bytes | size bytes |</div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span> </div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span> All fields are using unsigned data types.</div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span> </div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span> \section app Application</div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span> </div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span> The application layer is a optional security layer, the default implementation is clear text</div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span> (unsecure).</div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span> </div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span> If a security solution is used it will be part of that products documentation.</div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span> </div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span> \section hcp HCP</div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span> </div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span> The HCP frame is described in the \link hcpf HCP frame format section.</div></div><!-- fragment --></div><!-- contents -->
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