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| <h1>arm_q15_to_q31.c</h1> </div> |
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| <div class="contents"> |
| <a href="arm__q15__to__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_q15_to_q31.c </span> |
| <a name="l00009"></a>00009 <span class="comment">* </span> |
| <a name="l00010"></a>00010 <span class="comment">* Description: Converts the elements of the Q15 vector to Q31 vector. </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 |
| <a name="l00030"></a>00030 <span class="preprocessor">#include "<a class="code" href="arm__math_8h.html">arm_math.h</a>"</span> |
| <a name="l00031"></a>00031 |
| <a name="l00059"></a><a class="code" href="group__q15__to__x.html#ga7ba2d87366990ad5380439e2b4a4c0a5">00059</a> <span class="keywordtype">void</span> <a class="code" href="group__q15__to__x.html#ga7ba2d87366990ad5380439e2b4a4c0a5" title="Converts the elements of the Q15 vector to Q31 vector.">arm_q15_to_q31</a>( |
| <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> * pSrc, |
| <a name="l00061"></a>00061 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> * pDst, |
| <a name="l00062"></a>00062 uint32_t <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>) |
| <a name="l00063"></a>00063 { |
| <a name="l00064"></a>00064 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> *pIn = pSrc; <span class="comment">/* Src pointer */</span> |
| <a name="l00065"></a>00065 uint32_t blkCnt; <span class="comment">/* loop counter */</span> |
| <a name="l00066"></a>00066 |
| <a name="l00067"></a>00067 <span class="preprocessor">#ifndef ARM_MATH_CM0</span> |
| <a name="l00068"></a>00068 <span class="preprocessor"></span> |
| <a name="l00069"></a>00069 <span class="comment">/* Run the below code for Cortex-M4 and Cortex-M3 */</span> |
| <a name="l00070"></a>00070 |
| <a name="l00071"></a>00071 <span class="comment">/*loop Unrolling */</span> |
| <a name="l00072"></a>00072 blkCnt = blockSize >> 2u; |
| <a name="l00073"></a>00073 |
| <a name="l00074"></a>00074 <span class="comment">/* First part of the processing with loop unrolling. Compute 4 outputs at a time. </span> |
| <a name="l00075"></a>00075 <span class="comment"> ** a second loop below computes the remaining 1 to 3 samples. */</span> |
| <a name="l00076"></a>00076 <span class="keywordflow">while</span>(blkCnt > 0u) |
| <a name="l00077"></a>00077 { |
| <a name="l00078"></a>00078 <span class="comment">/* C = (q31_t)A << 16 */</span> |
| <a name="l00079"></a>00079 <span class="comment">/* convert from q15 to q31 and then store the results in the destination buffer */</span> |
| <a name="l00080"></a>00080 *pDst++ = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) * pIn++ << 16; |
| <a name="l00081"></a>00081 *pDst++ = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) * pIn++ << 16; |
| <a name="l00082"></a>00082 *pDst++ = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) * pIn++ << 16; |
| <a name="l00083"></a>00083 *pDst++ = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) * pIn++ << 16; |
| <a name="l00084"></a>00084 |
| <a name="l00085"></a>00085 <span class="comment">/* Decrement the loop counter */</span> |
| <a name="l00086"></a>00086 blkCnt--; |
| <a name="l00087"></a>00087 } |
| <a name="l00088"></a>00088 |
| <a name="l00089"></a>00089 <span class="comment">/* If the blockSize is not a multiple of 4, compute any remaining output samples here. </span> |
| <a name="l00090"></a>00090 <span class="comment"> ** No loop unrolling is used. */</span> |
| <a name="l00091"></a>00091 blkCnt = blockSize % 0x4u; |
| <a name="l00092"></a>00092 |
| <a name="l00093"></a>00093 <span class="preprocessor">#else</span> |
| <a name="l00094"></a>00094 <span class="preprocessor"></span> |
| <a name="l00095"></a>00095 <span class="comment">/* Run the below code for Cortex-M0 */</span> |
| <a name="l00096"></a>00096 |
| <a name="l00097"></a>00097 <span class="comment">/* Loop over blockSize number of values */</span> |
| <a name="l00098"></a>00098 blkCnt = <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>; |
| <a name="l00099"></a>00099 |
| <a name="l00100"></a>00100 <span class="preprocessor">#endif </span><span class="comment">/* #ifndef ARM_MATH_CM0 */</span> |
| <a name="l00101"></a>00101 |
| <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 = (q31_t)A << 16 */</span> |
| <a name="l00105"></a>00105 <span class="comment">/* convert from q15 to q31 and then store the results in the destination buffer */</span> |
| <a name="l00106"></a>00106 *pDst++ = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) * pIn++ << 16; |
| <a name="l00107"></a>00107 |
| <a name="l00108"></a>00108 <span class="comment">/* Decrement the loop counter */</span> |
| <a name="l00109"></a>00109 blkCnt--; |
| <a name="l00110"></a>00110 } |
| <a name="l00111"></a>00111 |
| <a name="l00112"></a>00112 } |
| <a name="l00113"></a>00113 |
| </pre></div></div> |
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