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| <h1>arm_mat_scale_q31.c</h1> </div> |
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| <div class="contents"> |
| <a href="arm__mat__scale__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_mat_scale_q31.c </span> |
| <a name="l00009"></a>00009 <span class="comment">* </span> |
| <a name="l00010"></a>00010 <span class="comment">* Description: Multiplies a Q31 matrix by a scalar. </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 0.0.5 2010/04/26 </span> |
| <a name="l00030"></a>00030 <span class="comment">* incorporated review comments and updated with latest CMSIS layer </span> |
| <a name="l00031"></a>00031 <span class="comment">* </span> |
| <a name="l00032"></a>00032 <span class="comment">* Version 0.0.3 2010/03/10 </span> |
| <a name="l00033"></a>00033 <span class="comment">* Initial version </span> |
| <a name="l00034"></a>00034 <span class="comment">* -------------------------------------------------------------------- */</span> |
| <a name="l00035"></a>00035 |
| <a name="l00036"></a>00036 <span class="preprocessor">#include "<a class="code" href="arm__math_8h.html">arm_math.h</a>"</span> |
| <a name="l00037"></a>00037 |
| <a name="l00063"></a><a class="code" href="group___matrix_scale.html#ga609743821ee81fa8c34c4bcdc1ed9744">00063</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___matrix_scale.html#ga609743821ee81fa8c34c4bcdc1ed9744" title="Q31 matrix scaling.">arm_mat_scale_q31</a>( |
| <a name="l00064"></a>00064 <span class="keyword">const</span> <a class="code" href="structarm__matrix__instance__q31.html" title="Instance structure for the Q31 matrix structure.">arm_matrix_instance_q31</a> * pSrc, |
| <a name="l00065"></a>00065 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> scaleFract, |
| <a name="l00066"></a>00066 int32_t shift, |
| <a name="l00067"></a>00067 <a class="code" href="structarm__matrix__instance__q31.html" title="Instance structure for the Q31 matrix structure.">arm_matrix_instance_q31</a> * pDst) |
| <a name="l00068"></a>00068 { |
| <a name="l00069"></a>00069 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> *pIn = pSrc-><a class="code" href="structarm__matrix__instance__q31.html#a09a64267c0579fef086efc9059741e56">pData</a>; <span class="comment">/* input data matrix pointer */</span> |
| <a name="l00070"></a>00070 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> *pOut = pDst-><a class="code" href="structarm__matrix__instance__q31.html#a09a64267c0579fef086efc9059741e56">pData</a>; <span class="comment">/* output data matrix pointer */</span> |
| <a name="l00071"></a>00071 <a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a> out; <span class="comment">/* temporary variable to hold output value */</span> |
| <a name="l00072"></a>00072 uint32_t numSamples; <span class="comment">/* total number of elements in the matrix */</span> |
| <a name="l00073"></a>00073 int32_t totShift = 31 - shift; <span class="comment">/* shift to apply after scaling */</span> |
| <a name="l00074"></a>00074 uint32_t blkCnt; <span class="comment">/* loop counters */</span> |
| <a name="l00075"></a>00075 <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>; <span class="comment">/* status of matrix scaling */</span> |
| <a name="l00076"></a>00076 |
| <a name="l00077"></a>00077 <span class="preprocessor">#ifdef ARM_MATH_MATRIX_CHECK</span> |
| <a name="l00078"></a>00078 <span class="preprocessor"></span> |
| <a name="l00079"></a>00079 |
| <a name="l00080"></a>00080 <span class="comment">/* Check for matrix mismatch */</span> |
| <a name="l00081"></a>00081 <span class="keywordflow">if</span>((pSrc-><a class="code" href="structarm__matrix__instance__q31.html#a63bacac158a821c8cfc06088d251598c">numRows</a> != pDst-><a class="code" href="structarm__matrix__instance__q31.html#a63bacac158a821c8cfc06088d251598c">numRows</a>) || (pSrc-><a class="code" href="structarm__matrix__instance__q31.html#abd161da7614eda927157f18b698074b1">numCols</a> != pDst-><a class="code" href="structarm__matrix__instance__q31.html#abd161da7614eda927157f18b698074b1">numCols</a>)) |
| <a name="l00082"></a>00082 { |
| <a name="l00083"></a>00083 <span class="comment">/* Set status as ARM_MATH_SIZE_MISMATCH */</span> |
| <a name="l00084"></a>00084 status = <a class="code" href="arm__math_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6a7071b92f1f6bc3c5c312a237ea91105b">ARM_MATH_SIZE_MISMATCH</a>; |
| <a name="l00085"></a>00085 } |
| <a name="l00086"></a>00086 <span class="keywordflow">else</span> |
| <a name="l00087"></a>00087 <span class="preprocessor">#endif </span><span class="comment">/* #ifdef ARM_MATH_MATRIX_CHECK */</span> |
| <a name="l00088"></a>00088 |
| <a name="l00089"></a>00089 { |
| <a name="l00090"></a>00090 <span class="comment">/* Total number of samples in the input matrix */</span> |
| <a name="l00091"></a>00091 numSamples = (uint32_t) pSrc-><a class="code" href="structarm__matrix__instance__q31.html#a63bacac158a821c8cfc06088d251598c">numRows</a> * pSrc-><a class="code" href="structarm__matrix__instance__q31.html#abd161da7614eda927157f18b698074b1">numCols</a>; |
| <a name="l00092"></a>00092 |
| <a name="l00093"></a>00093 #ifndef ARM_MATH_CM0 |
| <a name="l00094"></a>00094 |
| <a name="l00095"></a>00095 <span class="comment">/* Run the below code for Cortex-M4 and Cortex-M3 */</span> |
| <a name="l00096"></a>00096 |
| <a name="l00097"></a>00097 <span class="comment">/* Loop Unrolling */</span> |
| <a name="l00098"></a>00098 blkCnt = numSamples >> 2u; |
| <a name="l00099"></a>00099 |
| <a name="l00100"></a>00100 <span class="comment">/* First part of the processing with loop unrolling. Compute 4 outputs at a time. </span> |
| <a name="l00101"></a>00101 <span class="comment"> ** a second loop below computes the remaining 1 to 3 samples. */</span> |
| <a name="l00102"></a>00102 <span class="keywordflow">while</span>(blkCnt > 0u) |
| <a name="l00103"></a>00103 { |
| <a name="l00104"></a>00104 <span class="comment">/* C(m,n) = A(m,n) * k */</span> |
| <a name="l00105"></a>00105 <span class="comment">/* Scale, saturate and then store the results in the destination buffer. */</span> |
| <a name="l00106"></a>00106 out = ((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) * pIn++ * scaleFract) >> totShift; |
| <a name="l00107"></a>00107 *pOut++ = <a class="code" href="arm__math_8h.html#ad7373e53d3c2e1adfeafc8c2e9720b5c" title="Clips Q63 to Q31 values.">clip_q63_to_q31</a>(out); |
| <a name="l00108"></a>00108 out = ((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) * pIn++ * scaleFract) >> totShift; |
| <a name="l00109"></a>00109 *pOut++ = <a class="code" href="arm__math_8h.html#ad7373e53d3c2e1adfeafc8c2e9720b5c" title="Clips Q63 to Q31 values.">clip_q63_to_q31</a>(out); |
| <a name="l00110"></a>00110 out = ((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) * pIn++ * scaleFract) >> totShift; |
| <a name="l00111"></a>00111 *pOut++ = <a class="code" href="arm__math_8h.html#ad7373e53d3c2e1adfeafc8c2e9720b5c" title="Clips Q63 to Q31 values.">clip_q63_to_q31</a>(out); |
| <a name="l00112"></a>00112 out = ((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) * pIn++ * scaleFract) >> totShift; |
| <a name="l00113"></a>00113 *pOut++ = <a class="code" href="arm__math_8h.html#ad7373e53d3c2e1adfeafc8c2e9720b5c" title="Clips Q63 to Q31 values.">clip_q63_to_q31</a>(out); |
| <a name="l00114"></a>00114 |
| <a name="l00115"></a>00115 <span class="comment">/* Decrement the numSamples loop counter */</span> |
| <a name="l00116"></a>00116 blkCnt--; |
| <a name="l00117"></a>00117 } |
| <a name="l00118"></a>00118 |
| <a name="l00119"></a>00119 <span class="comment">/* If the numSamples is not a multiple of 4, compute any remaining output samples here. </span> |
| <a name="l00120"></a>00120 <span class="comment"> ** No loop unrolling is used. */</span> |
| <a name="l00121"></a>00121 blkCnt = numSamples % 0x4u; |
| <a name="l00122"></a>00122 |
| <a name="l00123"></a>00123 <span class="preprocessor">#else</span> |
| <a name="l00124"></a>00124 <span class="preprocessor"></span> |
| <a name="l00125"></a>00125 <span class="comment">/* Run the below code for Cortex-M0 */</span> |
| <a name="l00126"></a>00126 |
| <a name="l00127"></a>00127 <span class="comment">/* Initialize blkCnt with number of samples */</span> |
| <a name="l00128"></a>00128 blkCnt = numSamples; |
| <a name="l00129"></a>00129 |
| <a name="l00130"></a>00130 <span class="preprocessor">#endif </span><span class="comment">/* #ifndef ARM_MATH_CM0 */</span> |
| <a name="l00131"></a>00131 |
| <a name="l00132"></a>00132 <span class="keywordflow">while</span>(blkCnt > 0u) |
| <a name="l00133"></a>00133 { |
| <a name="l00134"></a>00134 <span class="comment">/* C(m,n) = A(m,n) * k */</span> |
| <a name="l00135"></a>00135 <span class="comment">/* Scale, saturate and then store the results in the destination buffer. */</span> |
| <a name="l00136"></a>00136 out = ((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) * pIn++ * scaleFract) >> totShift; |
| <a name="l00137"></a>00137 *pOut++ = <a class="code" href="arm__math_8h.html#ad7373e53d3c2e1adfeafc8c2e9720b5c" title="Clips Q63 to Q31 values.">clip_q63_to_q31</a>(out); |
| <a name="l00138"></a>00138 |
| <a name="l00139"></a>00139 <span class="comment">/* Decrement the numSamples loop counter */</span> |
| <a name="l00140"></a>00140 blkCnt--; |
| <a name="l00141"></a>00141 } |
| <a name="l00142"></a>00142 <span class="comment">/* Set status as ARM_MATH_SUCCESS */</span> |
| <a name="l00143"></a>00143 status = <a class="code" href="arm__math_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6a9f8b2a10bd827fb4600e77d455902eb0">ARM_MATH_SUCCESS</a>; |
| <a name="l00144"></a>00144 } |
| <a name="l00145"></a>00145 |
| <a name="l00146"></a>00146 <span class="comment">/* Return to application */</span> |
| <a name="l00147"></a>00147 <span class="keywordflow">return</span> (status); |
| <a name="l00148"></a>00148 } |
| <a name="l00149"></a>00149 |
| </pre></div></div> |
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