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| <h1>arm_fir_interpolate_init_q31.c</h1> </div> |
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| <div class="contents"> |
| <a href="arm__fir__interpolate__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> |
| <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_fir_interpolate_init_q31.c </span> |
| <a name="l00009"></a>00009 <span class="comment">* </span> |
| <a name="l00010"></a>00010 <span class="comment">* Description: Q31 FIR interpolator 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 "<a class="code" href="arm__math_8h.html">arm_math.h</a>"</span> |
| <a name="l00034"></a>00034 |
| <a name="l00069"></a><a class="code" href="group___f_i_r___interpolate.html#ga9d0ba38ce9f12a850dd242731d307476">00069</a> <a class="code" href="arm__math_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6" title="Error status returned by some functions in the library.">arm_status</a> <a class="code" href="group___f_i_r___interpolate.html#ga9d0ba38ce9f12a850dd242731d307476" title="Initialization function for the Q31 FIR interpolator.">arm_fir_interpolate_init_q31</a>( |
| <a name="l00070"></a>00070 <a class="code" href="structarm__fir__interpolate__instance__q31.html" title="Instance structure for the Q31 FIR interpolator.">arm_fir_interpolate_instance_q31</a> * S, |
| <a name="l00071"></a>00071 uint8_t L, |
| <a name="l00072"></a>00072 uint16_t numTaps, |
| <a name="l00073"></a>00073 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> * pCoeffs, |
| <a name="l00074"></a>00074 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> * pState, |
| <a name="l00075"></a>00075 uint32_t <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>) |
| <a name="l00076"></a>00076 { |
| <a name="l00077"></a>00077 <a class="code" href="arm__math_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6" title="Error status returned by some functions in the library.">arm_status</a> <a class="code" href="arm__dotproduct__example__f32_8c.html#a88ccb294236ab22b00310c47164c53c3">status</a>; |
| <a name="l00078"></a>00078 |
| <a name="l00079"></a>00079 <span class="comment">/* The filter length must be a multiple of the interpolation factor */</span> |
| <a name="l00080"></a>00080 <span class="keywordflow">if</span>((numTaps % L) != 0u) |
| <a name="l00081"></a>00081 { |
| <a name="l00082"></a>00082 <span class="comment">/* Set status as ARM_MATH_LENGTH_ERROR */</span> |
| <a name="l00083"></a>00083 status = <a class="code" href="arm__math_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6a9ae74d7f8a53aec0512ae8f0a421e0e1">ARM_MATH_LENGTH_ERROR</a>; |
| <a name="l00084"></a>00084 } |
| <a name="l00085"></a>00085 <span class="keywordflow">else</span> |
| <a name="l00086"></a>00086 { |
| <a name="l00087"></a>00087 |
| <a name="l00088"></a>00088 <span class="comment">/* Assign coefficient pointer */</span> |
| <a name="l00089"></a>00089 S-><a class="code" href="structarm__fir__interpolate__instance__q31.html#afa719433687e1936ec3403d0d32f06e6">pCoeffs</a> = pCoeffs; |
| <a name="l00090"></a>00090 |
| <a name="l00091"></a>00091 <span class="comment">/* Assign Interpolation factor */</span> |
| <a name="l00092"></a>00092 S-><a class="code" href="structarm__fir__interpolate__instance__q31.html#a5cdf0a631cb74e0e9588c388abe5235c">L</a> = L; |
| <a name="l00093"></a>00093 |
| <a name="l00094"></a>00094 <span class="comment">/* Assign polyPhaseLength */</span> |
| <a name="l00095"></a>00095 S-><a class="code" href="structarm__fir__interpolate__instance__q31.html#a5d243796584afc7cd6c557f00b7acca5">phaseLength</a> = numTaps / L; |
| <a name="l00096"></a>00096 |
| <a name="l00097"></a>00097 <span class="comment">/* Clear state buffer and size of buffer is always phaseLength + blockSize - 1 */</span> |
| <a name="l00098"></a>00098 memset(pState, 0, |
| <a name="l00099"></a>00099 (blockSize + ((uint32_t) S-><a class="code" href="structarm__fir__interpolate__instance__q31.html#a5d243796584afc7cd6c557f00b7acca5">phaseLength</a> - 1u)) * <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>)); |
| <a name="l00100"></a>00100 |
| <a name="l00101"></a>00101 <span class="comment">/* Assign state pointer */</span> |
| <a name="l00102"></a>00102 S-><a class="code" href="structarm__fir__interpolate__instance__q31.html#addde04514b6e6ac72be3d609f0398b1a">pState</a> = pState; |
| <a name="l00103"></a>00103 |
| <a name="l00104"></a>00104 status = <a class="code" href="arm__math_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6a9f8b2a10bd827fb4600e77d455902eb0">ARM_MATH_SUCCESS</a>; |
| <a name="l00105"></a>00105 } |
| <a name="l00106"></a>00106 |
| <a name="l00107"></a>00107 <span class="keywordflow">return</span> (status); |
| <a name="l00108"></a>00108 |
| <a name="l00109"></a>00109 } |
| <a name="l00110"></a>00110 |
| </pre></div></div> |
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