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<h1>arm_iir_lattice_init_q15.c</h1>  </div>
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<a href="arm__iir__lattice__init__q15_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*-----------------------------------------------------------------------------   </span>
<a name="l00002"></a>00002 <span class="comment">* Copyright (C) 2010 ARM Limited. All rights reserved.   </span>
<a name="l00003"></a>00003 <span class="comment">*   </span>
<a name="l00004"></a>00004 <span class="comment">* $Date:        15. July 2011  </span>
<a name="l00005"></a>00005 <span class="comment">* $Revision:    V1.0.10  </span>
<a name="l00006"></a>00006 <span class="comment">*   </span>
<a name="l00007"></a>00007 <span class="comment">* Project:      CMSIS DSP Library   </span>
<a name="l00008"></a>00008 <span class="comment">* Title:        arm_iir_lattice_init_q15.c   </span>
<a name="l00009"></a>00009 <span class="comment">*   </span>
<a name="l00010"></a>00010 <span class="comment">* Description:  Q15 IIR lattice filter initialization function.   </span>
<a name="l00011"></a>00011 <span class="comment">*   </span>
<a name="l00012"></a>00012 <span class="comment">* Target Processor: Cortex-M4/Cortex-M3/Cortex-M0</span>
<a name="l00013"></a>00013 <span class="comment">*  </span>
<a name="l00014"></a>00014 <span class="comment">* Version 1.0.10 2011/7/15 </span>
<a name="l00015"></a>00015 <span class="comment">*    Big Endian support added and Merged M0 and M3/M4 Source code.  </span>
<a name="l00016"></a>00016 <span class="comment">*   </span>
<a name="l00017"></a>00017 <span class="comment">* Version 1.0.3 2010/11/29  </span>
<a name="l00018"></a>00018 <span class="comment">*    Re-organized the CMSIS folders and updated documentation.   </span>
<a name="l00019"></a>00019 <span class="comment">*    </span>
<a name="l00020"></a>00020 <span class="comment">* Version 1.0.2 2010/11/11   </span>
<a name="l00021"></a>00021 <span class="comment">*    Documentation updated.    </span>
<a name="l00022"></a>00022 <span class="comment">*   </span>
<a name="l00023"></a>00023 <span class="comment">* Version 1.0.1 2010/10/05    </span>
<a name="l00024"></a>00024 <span class="comment">*    Production release and review comments incorporated.   </span>
<a name="l00025"></a>00025 <span class="comment">*   </span>
<a name="l00026"></a>00026 <span class="comment">* Version 1.0.0 2010/09/20    </span>
<a name="l00027"></a>00027 <span class="comment">*    Production release and review comments incorporated   </span>
<a name="l00028"></a>00028 <span class="comment">*   </span>
<a name="l00029"></a>00029 <span class="comment">* Version 0.0.7  2010/06/10    </span>
<a name="l00030"></a>00030 <span class="comment">*    Misra-C changes done   </span>
<a name="l00031"></a>00031 <span class="comment">* ---------------------------------------------------------------------------*/</span>
<a name="l00032"></a>00032 
<a name="l00033"></a>00033 <span class="preprocessor">#include &quot;<a class="code" href="arm__math_8h.html">arm_math.h</a>&quot;</span>
<a name="l00034"></a>00034 
<a name="l00055"></a><a class="code" href="group___i_i_r___lattice.html#ga1f4bc2dd3d5641e96815d3a5aad58998">00055</a> <span class="keywordtype">void</span> <a class="code" href="group___i_i_r___lattice.html#ga1f4bc2dd3d5641e96815d3a5aad58998" title="Initialization function for the Q15 IIR lattice filter.">arm_iir_lattice_init_q15</a>(
<a name="l00056"></a>00056   <a class="code" href="structarm__iir__lattice__instance__q15.html" title="Instance structure for the Q15 IIR lattice filter.">arm_iir_lattice_instance_q15</a> * S,
<a name="l00057"></a>00057   uint16_t numStages,
<a name="l00058"></a>00058   <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> * pkCoeffs,
<a name="l00059"></a>00059   <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> * pvCoeffs,
<a name="l00060"></a>00060   <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> * pState,
<a name="l00061"></a>00061   uint32_t <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>)
<a name="l00062"></a>00062 {
<a name="l00063"></a>00063   <span class="comment">/* Assign filter taps */</span>
<a name="l00064"></a>00064   S-&gt;<a class="code" href="structarm__iir__lattice__instance__q15.html#a96fbed313bef01070409fa182d26ba3f">numStages</a> = numStages;
<a name="l00065"></a>00065 
<a name="l00066"></a>00066   <span class="comment">/* Assign reflection coefficient pointer */</span>
<a name="l00067"></a>00067   S-&gt;<a class="code" href="structarm__iir__lattice__instance__q15.html#a41c214a1ec38d4a82fae8899d715dd29">pkCoeffs</a> = pkCoeffs;
<a name="l00068"></a>00068 
<a name="l00069"></a>00069   <span class="comment">/* Assign ladder coefficient pointer */</span>
<a name="l00070"></a>00070   S-&gt;<a class="code" href="structarm__iir__lattice__instance__q15.html#a4c4f57f45b223abbe2a9fb727bd2cad9">pvCoeffs</a> = pvCoeffs;
<a name="l00071"></a>00071 
<a name="l00072"></a>00072   <span class="comment">/* Clear state buffer and size is always blockSize + numStages */</span>
<a name="l00073"></a>00073   memset(pState, 0, (numStages + blockSize) * <span class="keyword">sizeof</span>(<a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a>));
<a name="l00074"></a>00074 
<a name="l00075"></a>00075   <span class="comment">/* Assign state pointer */</span>
<a name="l00076"></a>00076   S-&gt;<a class="code" href="structarm__iir__lattice__instance__q15.html#afd0136ab917b529554d93f41a5e04618">pState</a> = pState;
<a name="l00077"></a>00077 
<a name="l00078"></a>00078 
<a name="l00079"></a>00079 }
<a name="l00080"></a>00080 
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