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49 <div class="headertitle">
50 <h1>arm_biquad_cascade_df1_init_q31.c</h1> </div>
52 <div class="contents">
53 <a href="arm__biquad__cascade__df1__init__q31_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>
54 <a name="l00002"></a>00002 <span class="comment">* Copyright (C) 2010 ARM Limited. All rights reserved. </span>
55 <a name="l00003"></a>00003 <span class="comment">* </span>
56 <a name="l00004"></a>00004 <span class="comment">* $Date: 15. July 2011 </span>
57 <a name="l00005"></a>00005 <span class="comment">* $Revision: V1.0.10 </span>
58 <a name="l00006"></a>00006 <span class="comment">* </span>
59 <a name="l00007"></a>00007 <span class="comment">* Project: CMSIS DSP Library </span>
60 <a name="l00008"></a>00008 <span class="comment">* Title: arm_biquad_cascade_df1_init_q31.c </span>
61 <a name="l00009"></a>00009 <span class="comment">* </span>
62 <a name="l00010"></a>00010 <span class="comment">* Description: Q31 Biquad cascade DirectFormI(DF1) filter initialization function. </span>
63 <a name="l00011"></a>00011 <span class="comment">* </span>
64 <a name="l00012"></a>00012 <span class="comment">* </span>
65 <a name="l00013"></a>00013 <span class="comment">* Target Processor: Cortex-M4/Cortex-M3/Cortex-M0</span>
66 <a name="l00014"></a>00014 <span class="comment">* </span>
67 <a name="l00015"></a>00015 <span class="comment">* Version 1.0.10 2011/7/15 </span>
68 <a name="l00016"></a>00016 <span class="comment">* Big Endian support added and Merged M0 and M3/M4 Source code. </span>
69 <a name="l00017"></a>00017 <span class="comment">* </span>
70 <a name="l00018"></a>00018 <span class="comment">* Version 1.0.3 2010/11/29 </span>
71 <a name="l00019"></a>00019 <span class="comment">* Re-organized the CMSIS folders and updated documentation. </span>
72 <a name="l00020"></a>00020 <span class="comment">* </span>
73 <a name="l00021"></a>00021 <span class="comment">* Version 1.0.2 2010/11/11 </span>
74 <a name="l00022"></a>00022 <span class="comment">* Documentation updated. </span>
75 <a name="l00023"></a>00023 <span class="comment">* </span>
76 <a name="l00024"></a>00024 <span class="comment">* Version 1.0.1 2010/10/05 </span>
77 <a name="l00025"></a>00025 <span class="comment">* Production release and review comments incorporated. </span>
78 <a name="l00026"></a>00026 <span class="comment">* </span>
79 <a name="l00027"></a>00027 <span class="comment">* Version 1.0.0 2010/09/20 </span>
80 <a name="l00028"></a>00028 <span class="comment">* Production release and review comments incorporated. </span>
81 <a name="l00029"></a>00029 <span class="comment">* </span>
82 <a name="l00030"></a>00030 <span class="comment">* Version 0.0.5 2010/04/26 </span>
83 <a name="l00031"></a>00031 <span class="comment">* incorporated review comments and updated with latest CMSIS layer </span>
84 <a name="l00032"></a>00032 <span class="comment">* </span>
85 <a name="l00033"></a>00033 <span class="comment">* Version 0.0.3 2010/03/10 </span>
86 <a name="l00034"></a>00034 <span class="comment">* Initial version </span>
87 <a name="l00035"></a>00035 <span class="comment">* -------------------------------------------------------------------- */</span>
88 <a name="l00036"></a>00036
89 <a name="l00037"></a>00037 <span class="preprocessor">#include "<a class="code" href="arm__math_8h.html">arm_math.h</a>"</span>
90 <a name="l00038"></a>00038
91 <a name="l00081"></a><a class="code" href="group___biquad_cascade_d_f1.html#gaf42a44f9b16d61e636418c83eefe577b">00081</a> <span class="keywordtype">void</span> <a class="code" href="group___biquad_cascade_d_f1.html#gaf42a44f9b16d61e636418c83eefe577b" title="Initialization function for the Q31 Biquad cascade filter.">arm_biquad_cascade_df1_init_q31</a>(
92 <a name="l00082"></a>00082 <a class="code" href="structarm__biquad__casd__df1__inst__q31.html" title="Instance structure for the Q31 Biquad cascade filter.">arm_biquad_casd_df1_inst_q31</a> * S,
93 <a name="l00083"></a>00083 uint8_t numStages,
94 <a name="l00084"></a>00084 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> * pCoeffs,
95 <a name="l00085"></a>00085 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> * pState,
96 <a name="l00086"></a>00086 int8_t postShift)
97 <a name="l00087"></a>00087 {
98 <a name="l00088"></a>00088 <span class="comment">/* Assign filter stages */</span>
99 <a name="l00089"></a>00089 S-><a class="code" href="structarm__biquad__casd__df1__inst__q31.html#a2c2b579f1df1d8273a5d9d945c27e1b2">numStages</a> = numStages;
100 <a name="l00090"></a>00090
101 <a name="l00091"></a>00091 <span class="comment">/* Assign postShift to be applied to the output */</span>
102 <a name="l00092"></a>00092 S-><a class="code" href="structarm__biquad__casd__df1__inst__q31.html#a636c7fbe09ec4bef0bc0a4b4e2151cbe">postShift</a> = postShift;
103 <a name="l00093"></a>00093
104 <a name="l00094"></a>00094 <span class="comment">/* Assign coefficient pointer */</span>
105 <a name="l00095"></a>00095 S-><a class="code" href="structarm__biquad__casd__df1__inst__q31.html#aa62366c632f3b5305086f841f079dbd2">pCoeffs</a> = pCoeffs;
106 <a name="l00096"></a>00096
107 <a name="l00097"></a>00097 <span class="comment">/* Clear state buffer and size is always 4 * numStages */</span>
108 <a name="l00098"></a>00098 memset(pState, 0, (4u * (uint32_t) numStages) * <span class="keyword">sizeof</span>(<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>));
109 <a name="l00099"></a>00099
110 <a name="l00100"></a>00100 <span class="comment">/* Assign state pointer */</span>
111 <a name="l00101"></a>00101 S-><a class="code" href="structarm__biquad__casd__df1__inst__q31.html#a5dcf4727f58eb4e8e8b392508d8657bb">pState</a> = pState;
112 <a name="l00102"></a>00102 }
113 <a name="l00103"></a>00103
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