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<h1>arm_float_to_q31.c</h1> </div>
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<a href="arm__float__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_float_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 floating-point 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 &quot;<a class="code" href="arm__math_8h.html">arm_math.h</a>&quot;</span>
<a name="l00031"></a>00031
<a name="l00069"></a><a class="code" href="group__float__to__x.html#ga177704107f94564e9abe4daaa36f4554">00069</a> <span class="keywordtype">void</span> <a class="code" href="group__float__to__x.html#ga177704107f94564e9abe4daaa36f4554" title="Converts the elements of the floating-point vector to Q31 vector.">arm_float_to_q31</a>(
<a name="l00070"></a>00070 <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> * pSrc,
<a name="l00071"></a>00071 <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="l00072"></a>00072 uint32_t <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>)
<a name="l00073"></a>00073 {
<a name="l00074"></a>00074 <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> *pIn = pSrc; <span class="comment">/* Src pointer */</span>
<a name="l00075"></a>00075 uint32_t blkCnt; <span class="comment">/* loop counter */</span>
<a name="l00076"></a>00076
<a name="l00077"></a>00077 <span class="preprocessor">#ifdef ARM_MATH_ROUNDING</span>
<a name="l00078"></a>00078 <span class="preprocessor"></span>
<a name="l00079"></a>00079 <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> in;
<a name="l00080"></a>00080
<a name="l00081"></a>00081 <span class="preprocessor">#endif </span><span class="comment">/* #ifdef ARM_MATH_ROUNDING */</span>
<a name="l00082"></a>00082
<a name="l00083"></a>00083 <span class="preprocessor">#ifndef ARM_MATH_CM0</span>
<a name="l00084"></a>00084 <span class="preprocessor"></span>
<a name="l00085"></a>00085 <span class="comment">/* Run the below code for Cortex-M4 and Cortex-M3 */</span>
<a name="l00086"></a>00086
<a name="l00087"></a>00087 <span class="comment">/*loop Unrolling */</span>
<a name="l00088"></a>00088 blkCnt = blockSize &gt;&gt; 2u;
<a name="l00089"></a>00089
<a name="l00090"></a>00090 <span class="comment">/* First part of the processing with loop unrolling. Compute 4 outputs at a time. </span>
<a name="l00091"></a>00091 <span class="comment"> ** a second loop below computes the remaining 1 to 3 samples. */</span>
<a name="l00092"></a>00092 <span class="keywordflow">while</span>(blkCnt &gt; 0u)
<a name="l00093"></a>00093 {
<a name="l00094"></a>00094
<a name="l00095"></a>00095 <span class="preprocessor">#ifdef ARM_MATH_ROUNDING</span>
<a name="l00096"></a>00096 <span class="preprocessor"></span>
<a name="l00097"></a>00097 <span class="comment">/* C = A * 32768 */</span>
<a name="l00098"></a>00098 <span class="comment">/* convert from float to Q31 and then store the results in the destination buffer */</span>
<a name="l00099"></a>00099 in = *pIn++;
<a name="l00100"></a>00100 in = (in * 2147483648.0f);
<a name="l00101"></a>00101 in += in &gt; 0 ? 0.5 : -0.5;
<a name="l00102"></a>00102 *pDst++ = <a class="code" href="arm__math_8h.html#ad7373e53d3c2e1adfeafc8c2e9720b5c" title="Clips Q63 to Q31 values.">clip_q63_to_q31</a>((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) (in));
<a name="l00103"></a>00103
<a name="l00104"></a>00104 in = *pIn++;
<a name="l00105"></a>00105 in = (in * 2147483648.0f);
<a name="l00106"></a>00106 in += in &gt; 0 ? 0.5 : -0.5;
<a name="l00107"></a>00107 *pDst++ = <a class="code" href="arm__math_8h.html#ad7373e53d3c2e1adfeafc8c2e9720b5c" title="Clips Q63 to Q31 values.">clip_q63_to_q31</a>((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) (in));
<a name="l00108"></a>00108
<a name="l00109"></a>00109 in = *pIn++;
<a name="l00110"></a>00110 in = (in * 2147483648.0f);
<a name="l00111"></a>00111 in += in &gt; 0 ? 0.5 : -0.5;
<a name="l00112"></a>00112 *pDst++ = <a class="code" href="arm__math_8h.html#ad7373e53d3c2e1adfeafc8c2e9720b5c" title="Clips Q63 to Q31 values.">clip_q63_to_q31</a>((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) (in));
<a name="l00113"></a>00113
<a name="l00114"></a>00114 in = *pIn++;
<a name="l00115"></a>00115 in = (in * 2147483648.0f);
<a name="l00116"></a>00116 in += in &gt; 0 ? 0.5 : -0.5;
<a name="l00117"></a>00117 *pDst++ = <a class="code" href="arm__math_8h.html#ad7373e53d3c2e1adfeafc8c2e9720b5c" title="Clips Q63 to Q31 values.">clip_q63_to_q31</a>((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) (in));
<a name="l00118"></a>00118
<a name="l00119"></a>00119 <span class="preprocessor">#else</span>
<a name="l00120"></a>00120 <span class="preprocessor"></span>
<a name="l00121"></a>00121 <span class="comment">/* C = A * 2147483648 */</span>
<a name="l00122"></a>00122 <span class="comment">/* convert from float to Q31 and then store the results in the destination buffer */</span>
<a name="l00123"></a>00123 *pDst++ = <a class="code" href="arm__math_8h.html#ad7373e53d3c2e1adfeafc8c2e9720b5c" title="Clips Q63 to Q31 values.">clip_q63_to_q31</a>((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) (*pIn++ * 2147483648.0f));
<a name="l00124"></a>00124 *pDst++ = <a class="code" href="arm__math_8h.html#ad7373e53d3c2e1adfeafc8c2e9720b5c" title="Clips Q63 to Q31 values.">clip_q63_to_q31</a>((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) (*pIn++ * 2147483648.0f));
<a name="l00125"></a>00125 *pDst++ = <a class="code" href="arm__math_8h.html#ad7373e53d3c2e1adfeafc8c2e9720b5c" title="Clips Q63 to Q31 values.">clip_q63_to_q31</a>((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) (*pIn++ * 2147483648.0f));
<a name="l00126"></a>00126 *pDst++ = <a class="code" href="arm__math_8h.html#ad7373e53d3c2e1adfeafc8c2e9720b5c" title="Clips Q63 to Q31 values.">clip_q63_to_q31</a>((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) (*pIn++ * 2147483648.0f));
<a name="l00127"></a>00127
<a name="l00128"></a>00128 <span class="preprocessor">#endif </span><span class="comment">/* #ifdef ARM_MATH_ROUNDING */</span>
<a name="l00129"></a>00129
<a name="l00130"></a>00130 <span class="comment">/* Decrement the loop counter */</span>
<a name="l00131"></a>00131 blkCnt--;
<a name="l00132"></a>00132 }
<a name="l00133"></a>00133
<a name="l00134"></a>00134 <span class="comment">/* If the blockSize is not a multiple of 4, compute any remaining output samples here. </span>
<a name="l00135"></a>00135 <span class="comment"> ** No loop unrolling is used. */</span>
<a name="l00136"></a>00136 blkCnt = blockSize % 0x4u;
<a name="l00137"></a>00137
<a name="l00138"></a>00138 <span class="keywordflow">while</span>(blkCnt &gt; 0u)
<a name="l00139"></a>00139 {
<a name="l00140"></a>00140
<a name="l00141"></a>00141 <span class="preprocessor">#ifdef ARM_MATH_ROUNDING</span>
<a name="l00142"></a>00142 <span class="preprocessor"></span>
<a name="l00143"></a>00143 <span class="comment">/* C = A * 2147483648 */</span>
<a name="l00144"></a>00144 <span class="comment">/* convert from float to Q31 and then store the results in the destination buffer */</span>
<a name="l00145"></a>00145 in = *pIn++;
<a name="l00146"></a>00146 in = (in * 2147483648.0f);
<a name="l00147"></a>00147 in += in &gt; 0 ? 0.5 : -0.5;
<a name="l00148"></a>00148 *pDst++ = <a class="code" href="arm__math_8h.html#ad7373e53d3c2e1adfeafc8c2e9720b5c" title="Clips Q63 to Q31 values.">clip_q63_to_q31</a>((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) (in));
<a name="l00149"></a>00149
<a name="l00150"></a>00150 <span class="preprocessor">#else</span>
<a name="l00151"></a>00151 <span class="preprocessor"></span>
<a name="l00152"></a>00152 <span class="comment">/* C = A * 2147483648 */</span>
<a name="l00153"></a>00153 <span class="comment">/* convert from float to Q31 and then store the results in the destination buffer */</span>
<a name="l00154"></a>00154 *pDst++ = <a class="code" href="arm__math_8h.html#ad7373e53d3c2e1adfeafc8c2e9720b5c" title="Clips Q63 to Q31 values.">clip_q63_to_q31</a>((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) (*pIn++ * 2147483648.0f));
<a name="l00155"></a>00155
<a name="l00156"></a>00156 <span class="preprocessor">#endif </span><span class="comment">/* #ifdef ARM_MATH_ROUNDING */</span>
<a name="l00157"></a>00157
<a name="l00158"></a>00158 <span class="comment">/* Decrement the loop counter */</span>
<a name="l00159"></a>00159 blkCnt--;
<a name="l00160"></a>00160 }
<a name="l00161"></a>00161
<a name="l00162"></a>00162
<a name="l00163"></a>00163 <span class="preprocessor">#else</span>
<a name="l00164"></a>00164 <span class="preprocessor"></span>
<a name="l00165"></a>00165 <span class="comment">/* Run the below code for Cortex-M0 */</span>
<a name="l00166"></a>00166
<a name="l00167"></a>00167 <span class="comment">/* Loop over blockSize number of values */</span>
<a name="l00168"></a>00168 blkCnt = <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>;
<a name="l00169"></a>00169
<a name="l00170"></a>00170 <span class="keywordflow">while</span>(blkCnt &gt; 0u)
<a name="l00171"></a>00171 {
<a name="l00172"></a>00172
<a name="l00173"></a>00173 <span class="preprocessor">#ifdef ARM_MATH_ROUNDING</span>
<a name="l00174"></a>00174 <span class="preprocessor"></span>
<a name="l00175"></a>00175 <span class="comment">/* C = A * 2147483648 */</span>
<a name="l00176"></a>00176 <span class="comment">/* convert from float to Q31 and then store the results in the destination buffer */</span>
<a name="l00177"></a>00177 in = *pIn++;
<a name="l00178"></a>00178 in = (in * 2147483648.0f);
<a name="l00179"></a>00179 in += in &gt; 0 ? 0.5f : -0.5f;
<a name="l00180"></a>00180 *pDst++ = <a class="code" href="arm__math_8h.html#ad7373e53d3c2e1adfeafc8c2e9720b5c" title="Clips Q63 to Q31 values.">clip_q63_to_q31</a>((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) (in));
<a name="l00181"></a>00181
<a name="l00182"></a>00182 <span class="preprocessor">#else</span>
<a name="l00183"></a>00183 <span class="preprocessor"></span>
<a name="l00184"></a>00184 <span class="comment">/* C = A * 2147483648 */</span>
<a name="l00185"></a>00185 <span class="comment">/* convert from float to Q31 and then store the results in the destination buffer */</span>
<a name="l00186"></a>00186 *pDst++ = <a class="code" href="arm__math_8h.html#ad7373e53d3c2e1adfeafc8c2e9720b5c" title="Clips Q63 to Q31 values.">clip_q63_to_q31</a>((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) (*pIn++ * 2147483648.0f));
<a name="l00187"></a>00187
<a name="l00188"></a>00188 <span class="preprocessor">#endif </span><span class="comment">/* #ifdef ARM_MATH_ROUNDING */</span>
<a name="l00189"></a>00189
<a name="l00190"></a>00190 <span class="comment">/* Decrement the loop counter */</span>
<a name="l00191"></a>00191 blkCnt--;
<a name="l00192"></a>00192 }
<a name="l00193"></a>00193
<a name="l00194"></a>00194 <span class="preprocessor">#endif </span><span class="comment">/* #ifndef ARM_MATH_CM0 */</span>
<a name="l00195"></a>00195
<a name="l00196"></a>00196 }
<a name="l00197"></a>00197
</pre></div></div>
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