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<div id="projectname">PicoVGA
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 <span id="projectnumber">1.2-cmake</span>
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<div id="projectbrief">VGA/TV display on Raspberry Pico</div>
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<div class="title">pwmsnd.h</div> </div>
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<a href="pwmsnd_8h.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span>  </div>
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<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="preprocessor">#ifndef _PWMSND_H</span></div>
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<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="preprocessor">#define _PWMSND_H</span></div>
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<div class="line"><a name="l00010"></a><span class="lineno"> 10</span>  </div>
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<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="preprocessor">#define PWMSND_GPIO 19 </span><span class="comment">// PWM output GPIO pin (0..29)</span></div>
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<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="preprocessor">#define PWMSND_SLICE ((PWMSND_GPIO>>1)&7) </span><span class="comment">// PWM slice index (=1)</span></div>
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<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="preprocessor">#define PWMSND_CHAN (PWMSND_GPIO&1) </span><span class="comment">// PWM channel index (=1)</span></div>
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<div class="line"><a name="l00014"></a><span class="lineno"> 14</span>  </div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="preprocessor">#define SOUNDRATE 22050 </span><span class="comment">// sound rate [Hz]</span></div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="preprocessor">#define PWMSND_TOP 255 </span><span class="comment">// PRM top (period = PWMSND_TOP + 1 = 256)</span></div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="preprocessor">#define PWMSND_CLOCK (SOUNDRATE*(PWMSND_TOP+1)) </span><span class="comment">// PWM clock (= 22050*256 = 5644800)</span></div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span>  </div>
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<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="preprocessor">#define SNDFRAC 10 </span><span class="comment">// number of fraction bits</span></div>
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<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="preprocessor">#define SNDINT (1<<SNDFRAC) </span><span class="comment">// integer part of sound fraction</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="comment">// current sound</span></div>
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<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="keyword">extern</span> <span class="keyword">const</span> u8* CurSound; <span class="comment">// current playing sound</span></div>
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<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="keyword">extern</span> <span class="keyword">volatile</span> <span class="keywordtype">int</span> SoundCnt; <span class="comment">// counter of current playing sound (<=0 no sound)</span></div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="keyword">extern</span> <span class="keywordtype">int</span> SoundInc; <span class="comment">// pointer increment</span></div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="keyword">extern</span> <span class="keyword">volatile</span> <span class="keywordtype">int</span> SoundAcc; <span class="comment">// pointer accumulator</span></div>
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<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="keyword">extern</span> <span class="keyword">const</span> u8* NextSound; <span class="comment">// next sound to play repeated sound</span></div>
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<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="keyword">extern</span> <span class="keywordtype">int</span> NextSoundCnt; <span class="comment">// counter of next sound (0=no repeated sound)</span></div>
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<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  </div>
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<div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="keywordtype">void</span> <a class="code" href="group__PWMGroup.html#ga125653aeeb2dc605e83d0927a635983c">PWMSndInit</a>();</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="l00062"></a><span class="lineno"> 62</span> <span class="keywordtype">void</span> <a class="code" href="group__PWMGroup.html#ga7d7587ed33cbb0e94588c96735b5e6d5">PlaySound</a>(<span class="keyword">const</span> u8* snd, <span class="keywordtype">int</span> len, Bool rep = False, <span class="keywordtype">float</span> speed = 1.0f);</div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  </div>
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<div class="line"><a name="l00069"></a><span class="lineno"> 69</span> <span class="keywordtype">void</span> <a class="code" href="group__PWMGroup.html#gace7ff7d9e5fec2fa9c349305e72f1503">StopSound</a>();</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> <span class="comment">// update sound speed (1=normal speed)</span></div>
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<div class="line"><a name="l00077"></a><span class="lineno"> 77</span> <span class="comment"></span><span class="keywordtype">void</span> <a class="code" href="group__PWMGroup.html#gaa69a3c0ca6e5f20455ef1e60c2ea7b31">SpeedSound</a>(<span class="keywordtype">float</span> speed);</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="l00082"></a><span class="lineno"> 82</span> Bool <a class="code" href="group__PWMGroup.html#gac5cdc29178dd50bc69a6925a6af5c84a">PlayingSound</a>();</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="l00090"></a><span class="lineno"> 90</span> <span class="keywordtype">void</span> <a class="code" href="group__PWMGroup.html#gaf9f5fbc637ae75e22d2f628cbfd9b665">SetNextSound</a>(<span class="keyword">const</span> u8* snd, <span class="keywordtype">int</span> len);</div>
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<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  </div>
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<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  </div>
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<div class="line"><a name="l00094"></a><span class="lineno"> 94</span> <span class="preprocessor">#endif </span><span class="comment">// _PWMSND_H</span></div>
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<div class="ttc" id="agroup__PWMGroup_html_ga125653aeeb2dc605e83d0927a635983c"><div class="ttname"><a href="group__PWMGroup.html#ga125653aeeb2dc605e83d0927a635983c">PWMSndInit</a></div><div class="ttdeci">void PWMSndInit()</div><div class="ttdoc">Initialize PWM sound output.</div><div class="ttdef"><b>Definition:</b> pwmsnd.cpp:65</div></div>
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<div class="ttc" id="agroup__PWMGroup_html_ga7d7587ed33cbb0e94588c96735b5e6d5"><div class="ttname"><a href="group__PWMGroup.html#ga7d7587ed33cbb0e94588c96735b5e6d5">PlaySound</a></div><div class="ttdeci">void PlaySound(const u8 *snd, int len, Bool rep=False, float speed=1.0f)</div><div class="ttdoc">Output PWM sound.</div><div class="ttdef"><b>Definition:</b> pwmsnd.cpp:97</div></div>
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<div class="ttc" id="agroup__PWMGroup_html_gaa69a3c0ca6e5f20455ef1e60c2ea7b31"><div class="ttname"><a href="group__PWMGroup.html#gaa69a3c0ca6e5f20455ef1e60c2ea7b31">SpeedSound</a></div><div class="ttdeci">void SpeedSound(float speed)</div><div class="ttdoc">Update sound speed.</div><div class="ttdef"><b>Definition:</b> pwmsnd.cpp:132</div></div>
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<div class="ttc" id="agroup__PWMGroup_html_gac5cdc29178dd50bc69a6925a6af5c84a"><div class="ttname"><a href="group__PWMGroup.html#gac5cdc29178dd50bc69a6925a6af5c84a">PlayingSound</a></div><div class="ttdeci">Bool PlayingSound()</div><div class="ttdoc">Check if playing sound.</div><div class="ttdef"><b>Definition:</b> pwmsnd.cpp:138</div></div>
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<div class="ttc" id="agroup__PWMGroup_html_gace7ff7d9e5fec2fa9c349305e72f1503"><div class="ttname"><a href="group__PWMGroup.html#gace7ff7d9e5fec2fa9c349305e72f1503">StopSound</a></div><div class="ttdeci">void StopSound()</div><div class="ttdoc">stop playing sound</div><div class="ttdef"><b>Definition:</b> pwmsnd.cpp:124</div></div>
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<div class="ttc" id="agroup__PWMGroup_html_gaf9f5fbc637ae75e22d2f628cbfd9b665"><div class="ttname"><a href="group__PWMGroup.html#gaf9f5fbc637ae75e22d2f628cbfd9b665">SetNextSound</a></div><div class="ttdeci">void SetNextSound(const u8 *snd, int len)</div><div class="ttdoc">Set the next sound to play.</div><div class="ttdef"><b>Definition:</b> pwmsnd.cpp:144</div></div>
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