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<div class="title">MiniDSP.cpp</div> </div>
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<a href="_mini_d_s_p_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">/* Copyright (C) 2021 Kristian Sloth Lauszus and Dennis Frett. All rights reserved.</span></div>
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<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"></span> </div>
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<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> This software may be distributed and modified under the terms of the GNU</span></div>
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<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> General Public License version 2 (GPL2) as published by the Free Software</span></div>
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<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> Foundation and appearing in the file GPL2.TXT included in the packaging of</span></div>
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<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> this file. Please note that GPL2 Section 2[b] requires that all works based</span></div>
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<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> on this software must also be made publicly available under the terms of</span></div>
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<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> the GPL2 ("Copyleft").</span></div>
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<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"></span> </div>
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<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> Contact information</span></div>
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<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> -------------------</span></div>
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<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"></span> </div>
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<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> Kristian Sloth Lauszus</span></div>
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<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> Web : https://lauszus.com</span></div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> e-mail : lauszus@gmail.com</span></div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"></span> </div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> Dennis Frett</span></div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> GitHub : https://github.com/dennisfrett</span></div>
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<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment"> e-mail : dennis.frett@live.com</span></div>
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<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment"> */</span></div>
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<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>  </div>
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<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="preprocessor">#include "<a class="code" href="_mini_d_s_p_8h.html">MiniDSP.h</a>"</span></div>
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<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>  </div>
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<div class="line"><a name="l00024"></a><span class="lineno"><a class="line" href="class_mini_d_s_p.html#aa40ffa6a5d2ec8c49748aeb22cbb8a15"> 24</a></span> <span class="keywordtype">void</span> <a class="code" href="class_mini_d_s_p.html#aa40ffa6a5d2ec8c49748aeb22cbb8a15">MiniDSP::ParseHIDData</a>(<a class="code" href="class_u_s_b_h_i_d.html">USBHID</a> *hid __attribute__ ((unused)), <span class="keywordtype">bool</span> is_rpt_id __attribute__ ((unused)), uint8_t len, uint8_t *buf) {</div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  </div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  constexpr uint8_t StatusInputCommand[] = {0x05, 0xFF, 0xDA};</div>
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<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  </div>
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<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  <span class="comment">// Only care about valid data for the MiniDSP 2x4HD.</span></div>
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<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  <span class="keywordflow">if</span>(<a class="code" href="class_h_i_d_composite.html#acf516cb6242d1659c9bc77fe475c973e">HIDUniversal::VID</a> != <a class="code" href="_mini_d_s_p_8h.html#a96758ce2867ad7daa9b0e71307512813">MINIDSP_VID</a> || <a class="code" href="class_h_i_d_composite.html#a1402689fc7e633723fca2b6b175c2a18">HIDUniversal::PID</a> != <a class="code" href="_mini_d_s_p_8h.html#a4c11b5f7eff2bb882cc3390cc9562910">MINIDSP_PID</a> || len <= 4 || buf == <span class="keyword">nullptr</span>)</div>
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<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  <span class="keywordflow">return</span>;</div>
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<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  </div>
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<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  <span class="comment">// Check if this is a status update.</span></div>
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<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  <span class="comment">// First byte is the length, we ignore that for now.</span></div>
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<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  <span class="keywordflow">if</span>(memcmp(buf + 1, StatusInputCommand, <span class="keyword">sizeof</span> (StatusInputCommand)) == 0) {</div>
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<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  </div>
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<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  <span class="comment">// Parse data.</span></div>
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<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  <span class="comment">// Response is of format [ length ] [ 0x05 0xFF 0xDA ] [ volume ] [ muted ].</span></div>
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<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  <span class="keyword">const</span> <span class="keyword">auto</span> newVolume = buf[<span class="keyword">sizeof</span> (StatusInputCommand) + 1];</div>
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<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  <span class="keyword">const</span> <span class="keyword">auto</span> newIsMuted = (bool)buf[<span class="keyword">sizeof</span> (StatusInputCommand) + 2];</div>
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<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  </div>
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<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  <span class="keyword">const</span> <span class="keyword">auto</span> volumeChanged = newVolume != volume;</div>
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<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  <span class="keyword">const</span> <span class="keyword">auto</span> mutedChanged = newIsMuted != muted;</div>
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<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  </div>
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<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  <span class="comment">// Update status.</span></div>
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<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  volume = newVolume;</div>
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<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  muted = newIsMuted;</div>
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<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  </div>
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<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  <span class="comment">// Call callbacks.</span></div>
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<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  <span class="keywordflow">if</span>(pFuncOnVolumeChange != <span class="keyword">nullptr</span> && volumeChanged)</div>
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<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  pFuncOnVolumeChange(volume);</div>
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<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  </div>
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<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  <span class="keywordflow">if</span>(pFuncOnMutedChange != <span class="keyword">nullptr</span> && mutedChanged)</div>
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<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  pFuncOnMutedChange(muted);</div>
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<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  }</div>
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<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> };</div>
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<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  </div>
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<div class="line"><a name="l00057"></a><span class="lineno"><a class="line" href="class_mini_d_s_p.html#a631361040f3014292b44ffa8cdc254e5"> 57</a></span> uint8_t <a class="code" href="class_mini_d_s_p.html#a631361040f3014292b44ffa8cdc254e5">MiniDSP::OnInitSuccessful</a>() {</div>
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<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <span class="comment">// Verify we're actually connected to the MiniDSP 2x4HD.</span></div>
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<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <span class="keywordflow">if</span>(<a class="code" href="class_h_i_d_composite.html#acf516cb6242d1659c9bc77fe475c973e">HIDUniversal::VID</a> != <a class="code" href="_mini_d_s_p_8h.html#a96758ce2867ad7daa9b0e71307512813">MINIDSP_VID</a> || <a class="code" href="class_h_i_d_composite.html#a1402689fc7e633723fca2b6b175c2a18">HIDUniversal::PID</a> != <a class="code" href="_mini_d_s_p_8h.html#a4c11b5f7eff2bb882cc3390cc9562910">MINIDSP_PID</a>)</div>
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<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  <span class="keywordflow">return</span> 0;</div>
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<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  </div>
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<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  <span class="comment">// Request current status so we can initialize the values.</span></div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  RequestStatus();</div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  </div>
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<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <span class="keywordflow">if</span>(pFuncOnInit != <span class="keyword">nullptr</span>)</div>
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<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  pFuncOnInit();</div>
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<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  </div>
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<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <span class="keywordflow">return</span> 0;</div>
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<div class="line"><a name="l00069"></a><span class="lineno"> 69</span> };</div>
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<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  </div>
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<div class="line"><a name="l00071"></a><span class="lineno"> 71</span> uint8_t MiniDSP::Checksum(<span class="keyword">const</span> uint8_t *data, uint8_t data_length)<span class="keyword"> const </span>{</div>
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<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  uint16_t sum = 0;</div>
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<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  <span class="keywordflow">for</span>(uint8_t i = 0; i < data_length; i++)</div>
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<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  sum += data[i];</div>
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<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  </div>
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<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  <span class="keywordflow">return</span> sum & 0xFF;</div>
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<div class="line"><a name="l00077"></a><span class="lineno"> 77</span> }</div>
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<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  </div>
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<div class="line"><a name="l00079"></a><span class="lineno"> 79</span> <span class="keywordtype">void</span> MiniDSP::SendCommand(uint8_t *command, uint8_t command_length)<span class="keyword"> const </span>{</div>
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<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  <span class="comment">// Sanity check on command length.</span></div>
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<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <span class="keywordflow">if</span>(command_length > 63)</div>
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<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  <span class="keywordflow">return</span>;</div>
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<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  </div>
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<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  <span class="comment">// Message is padded to 64 bytes with 0xFF and is of format:</span></div>
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<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  <span class="comment">// [ length (command + checksum byte) ] [ command ] [ checksum ] [ OxFF... ]</span></div>
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<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  </div>
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<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  <span class="comment">// MiniDSP expects 64 byte messages.</span></div>
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<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  uint8_t buf[64];</div>
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<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  </div>
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<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <span class="comment">// Set length, including checksum byte.</span></div>
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<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  buf[0] = command_length + 1;</div>
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<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  </div>
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<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  <span class="comment">// Copy actual command.</span></div>
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<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  memcpy(&buf[1], command, command_length);</div>
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<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  </div>
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<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  <span class="keyword">const</span> <span class="keyword">auto</span> checksumOffset = command_length + 1;</div>
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<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  </div>
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<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  <span class="comment">// Set checksum byte.</span></div>
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<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  buf[checksumOffset] = Checksum(buf, command_length + 1);</div>
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<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  </div>
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<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  <span class="comment">// Pad the rest.</span></div>
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<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  memset(&buf[checksumOffset + 1], 0xFF, <span class="keyword">sizeof</span> (buf) - checksumOffset - 1);</div>
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<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  </div>
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<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  <a class="code" href="class_u_s_b_h_i_d.html#abb120ee1258c49b4af0fbd59ae6903f5">pUsb</a>-><a class="code" href="class_u_s_b.html#affbc018973a588995457d535b0ac7ee7">outTransfer</a>(<a class="code" href="class_u_s_b_h_i_d.html#a35fe591ddd550b290d1e88c321617ab6">bAddress</a>, <a class="code" href="class_h_i_d_composite.html#a4101c34c5079bd827953368450140a9a">epInfo</a>[<a class="code" href="class_u_s_b_h_i_d.html#af9ae556d2a7a03309db403e45eab96e8">epInterruptOutIndex</a>].epAddr, <span class="keyword">sizeof</span> (buf), buf);</div>
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<div class="line"><a name="l00105"></a><span class="lineno"> 105</span> }</div>
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<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  </div>
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<div class="line"><a name="l00107"></a><span class="lineno"> 107</span> <span class="keywordtype">void</span> MiniDSP::RequestStatus()<span class="keyword"> const </span>{</div>
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<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  uint8_t RequestStatusOutputCommand[] = {0x05, 0xFF, 0xDA, 0x02};</div>
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<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  </div>
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<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  SendCommand(RequestStatusOutputCommand, <span class="keyword">sizeof</span> (RequestStatusOutputCommand));</div>
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<div class="line"><a name="l00111"></a><span class="lineno"> 111</span> }</div>
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</div><!-- fragment --></div><!-- contents -->
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<div class="ttc" id="aclass_u_s_b_html_affbc018973a588995457d535b0ac7ee7"><div class="ttname"><a href="class_u_s_b.html#affbc018973a588995457d535b0ac7ee7">USB::outTransfer</a></div><div class="ttdeci">uint8_t outTransfer(uint8_t addr, uint8_t ep, uint16_t nbytes, uint8_t *data)</div><div class="ttdef"><b>Definition:</b> <a href="_usb_8cpp_source.html#l00303">Usb.cpp:303</a></div></div>
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<div class="ttc" id="aclass_mini_d_s_p_html_a631361040f3014292b44ffa8cdc254e5"><div class="ttname"><a href="class_mini_d_s_p.html#a631361040f3014292b44ffa8cdc254e5">MiniDSP::OnInitSuccessful</a></div><div class="ttdeci">uint8_t OnInitSuccessful()</div><div class="ttdef"><b>Definition:</b> <a href="_mini_d_s_p_8cpp_source.html#l00057">MiniDSP.cpp:57</a></div></div>
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<div class="ttc" id="aclass_u_s_b_h_i_d_html_a35fe591ddd550b290d1e88c321617ab6"><div class="ttname"><a href="class_u_s_b_h_i_d.html#a35fe591ddd550b290d1e88c321617ab6">USBHID::bAddress</a></div><div class="ttdeci">uint8_t bAddress</div><div class="ttdef"><b>Definition:</b> <a href="usbhid_8h_source.html#l00146">usbhid.h:146</a></div></div>
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<div class="ttc" id="a_mini_d_s_p_8h_html_a4c11b5f7eff2bb882cc3390cc9562910"><div class="ttname"><a href="_mini_d_s_p_8h.html#a4c11b5f7eff2bb882cc3390cc9562910">MINIDSP_PID</a></div><div class="ttdeci">#define MINIDSP_PID</div><div class="ttdef"><b>Definition:</b> <a href="_mini_d_s_p_8h_source.html#l00027">MiniDSP.h:27</a></div></div>
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<div class="ttc" id="a_mini_d_s_p_8h_html_a96758ce2867ad7daa9b0e71307512813"><div class="ttname"><a href="_mini_d_s_p_8h.html#a96758ce2867ad7daa9b0e71307512813">MINIDSP_VID</a></div><div class="ttdeci">#define MINIDSP_VID</div><div class="ttdef"><b>Definition:</b> <a href="_mini_d_s_p_8h_source.html#l00026">MiniDSP.h:26</a></div></div>
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<div class="ttc" id="aclass_mini_d_s_p_html_aa40ffa6a5d2ec8c49748aeb22cbb8a15"><div class="ttname"><a href="class_mini_d_s_p.html#aa40ffa6a5d2ec8c49748aeb22cbb8a15">MiniDSP::ParseHIDData</a></div><div class="ttdeci">void ParseHIDData(USBHID *hid, bool is_rpt_id, uint8_t len, uint8_t *buf)</div><div class="ttdef"><b>Definition:</b> <a href="_mini_d_s_p_8cpp_source.html#l00024">MiniDSP.cpp:24</a></div></div>
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<div class="ttc" id="a_mini_d_s_p_8h_html"><div class="ttname"><a href="_mini_d_s_p_8h.html">MiniDSP.h</a></div></div>
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<div class="ttc" id="aclass_u_s_b_h_i_d_html_abb120ee1258c49b4af0fbd59ae6903f5"><div class="ttname"><a href="class_u_s_b_h_i_d.html#abb120ee1258c49b4af0fbd59ae6903f5">USBHID::pUsb</a></div><div class="ttdeci">USB * pUsb</div><div class="ttdef"><b>Definition:</b> <a href="usbhid_8h_source.html#l00145">usbhid.h:145</a></div></div>
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<div class="ttc" id="aclass_h_i_d_composite_html_a4101c34c5079bd827953368450140a9a"><div class="ttname"><a href="class_h_i_d_composite.html#a4101c34c5079bd827953368450140a9a">HIDComposite::epInfo</a></div><div class="ttdeci">EpInfo epInfo[totalEndpoints]</div><div class="ttdef"><b>Definition:</b> <a href="hidcomposite_8h_source.html#l00063">hidcomposite.h:63</a></div></div>
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<div class="ttc" id="aclass_h_i_d_composite_html_acf516cb6242d1659c9bc77fe475c973e"><div class="ttname"><a href="class_h_i_d_composite.html#acf516cb6242d1659c9bc77fe475c973e">HIDComposite::VID</a></div><div class="ttdeci">uint16_t VID</div><div class="ttdef"><b>Definition:</b> <a href="hidcomposite_8h_source.html#l00071">hidcomposite.h:71</a></div></div>
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<div class="ttc" id="aclass_u_s_b_h_i_d_html_af9ae556d2a7a03309db403e45eab96e8"><div class="ttname"><a href="class_u_s_b_h_i_d.html#af9ae556d2a7a03309db403e45eab96e8">USBHID::epInterruptOutIndex</a></div><div class="ttdeci">static const uint8_t epInterruptOutIndex</div><div class="ttdef"><b>Definition:</b> <a href="usbhid_8h_source.html#l00150">usbhid.h:150</a></div></div>
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<div class="ttc" id="aclass_u_s_b_h_i_d_html"><div class="ttname"><a href="class_u_s_b_h_i_d.html">USBHID</a></div><div class="ttdef"><b>Definition:</b> <a href="usbhid_8h_source.html#l00143">usbhid.h:143</a></div></div>
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<div class="ttc" id="aclass_h_i_d_composite_html_a1402689fc7e633723fca2b6b175c2a18"><div class="ttname"><a href="class_h_i_d_composite.html#a1402689fc7e633723fca2b6b175c2a18">HIDComposite::PID</a></div><div class="ttdeci">uint16_t PID</div><div class="ttdef"><b>Definition:</b> <a href="hidcomposite_8h_source.html#l00071">hidcomposite.h:71</a></div></div>
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