297 lines
16 KiB
HTML
297 lines
16 KiB
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<title>CMSIS-DSP: Convert 32-bit floating point value</title>
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 <span id="projectnumber">Version 1.5.1</span>
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<a href="#func-members">Functions</a> </div>
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<div class="title">Convert 32-bit floating point value<div class="ingroups"><a class="el" href="group__groupSupport.html">Support Functions</a></div></div> </div>
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<table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
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Functions</h2></td></tr>
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<tr class="memitem:ga215456e35a18db86882e1d3f0d24e1f2"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__float__to__x.html#ga215456e35a18db86882e1d3f0d24e1f2">arm_float_to_q15</a> (<a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> *pSrc, <a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> *pDst, uint32_t <a class="el" href="arm__variance__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>)</td></tr>
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<tr class="memdesc:ga215456e35a18db86882e1d3f0d24e1f2"><td class="mdescLeft"> </td><td class="mdescRight">Converts the elements of the floating-point vector to Q15 vector. <a href="#ga215456e35a18db86882e1d3f0d24e1f2">More...</a><br/></td></tr>
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<tr class="separator:ga215456e35a18db86882e1d3f0d24e1f2"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ga177704107f94564e9abe4daaa36f4554"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__float__to__x.html#ga177704107f94564e9abe4daaa36f4554">arm_float_to_q31</a> (<a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> *pSrc, <a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *pDst, uint32_t <a class="el" href="arm__variance__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>)</td></tr>
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<tr class="memdesc:ga177704107f94564e9abe4daaa36f4554"><td class="mdescLeft"> </td><td class="mdescRight">Converts the elements of the floating-point vector to Q31 vector. <a href="#ga177704107f94564e9abe4daaa36f4554">More...</a><br/></td></tr>
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<tr class="separator:ga177704107f94564e9abe4daaa36f4554"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ga44a393818cdee8dce80f2d66add25411"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__float__to__x.html#ga44a393818cdee8dce80f2d66add25411">arm_float_to_q7</a> (<a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> *pSrc, <a class="el" href="arm__math_8h.html#ae541b6f232c305361e9b416fc9eed263">q7_t</a> *pDst, uint32_t <a class="el" href="arm__variance__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>)</td></tr>
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<tr class="memdesc:ga44a393818cdee8dce80f2d66add25411"><td class="mdescLeft"> </td><td class="mdescRight">Converts the elements of the floating-point vector to Q7 vector. <a href="#ga44a393818cdee8dce80f2d66add25411">More...</a><br/></td></tr>
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<tr class="separator:ga44a393818cdee8dce80f2d66add25411"><td class="memSeparator" colspan="2"> </td></tr>
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</table>
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<a name="details" id="details"></a><h2 class="groupheader">Description</h2>
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<h2 class="groupheader">Function Documentation</h2>
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<a class="anchor" id="ga215456e35a18db86882e1d3f0d24e1f2"></a>
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<div class="memitem">
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<table class="memname">
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<tr>
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<td class="memname">void arm_float_to_q15 </td>
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<td>(</td>
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<td class="paramtype"><a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> * </td>
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<td class="paramname"><em>pSrc</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype"><a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> * </td>
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<td class="paramname"><em>pDst</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">uint32_t </td>
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<td class="paramname"><em>blockSize</em> </td>
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</tr>
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<tr>
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<td></td>
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<td>)</td>
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<td></td><td></td>
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</tr>
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</table>
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</div><div class="memdoc">
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramdir">[in]</td><td class="paramname">*pSrc</td><td>points to the floating-point input vector </td></tr>
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<tr><td class="paramdir">[out]</td><td class="paramname">*pDst</td><td>points to the Q15 output vector </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">blockSize</td><td>length of the input vector </td></tr>
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</table>
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</dd>
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</dl>
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<dl class="section return"><dt>Returns</dt><dd>none.</dd></dl>
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<dl class="section user"><dt>Description:</dt><dd></dd></dl>
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<dl class="section user"><dt></dt><dd>The equation used for the conversion process is: <pre>
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pDst[n] = (q15_t)(pSrc[n] * 32768); 0 <= n < blockSize.
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</pre> </dd></dl>
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<dl class="section user"><dt>Scaling and Overflow Behavior:</dt><dd></dd></dl>
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<dl class="section user"><dt></dt><dd>The function uses saturating arithmetic. Results outside of the allowable Q15 range [0x8000 0x7FFF] will be saturated. </dd></dl>
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<dl class="section note"><dt>Note</dt><dd>In order to apply rounding, the library should be rebuilt with the ROUNDING macro defined in the preprocessor section of project options. </dd></dl>
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<p>References <a class="el" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>.</p>
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</div>
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</div>
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<a class="anchor" id="ga177704107f94564e9abe4daaa36f4554"></a>
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<div class="memitem">
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<table class="memname">
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<td class="memname">void arm_float_to_q31 </td>
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<td>(</td>
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<td class="paramtype"><a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> * </td>
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<td class="paramname"><em>pSrc</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype"><a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> * </td>
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<td class="paramname"><em>pDst</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">uint32_t </td>
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<td class="paramname"><em>blockSize</em> </td>
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</tr>
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<tr>
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<td></td>
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<td>)</td>
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<td></td><td></td>
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</tr>
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</table>
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</div><div class="memdoc">
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramdir">[in]</td><td class="paramname">*pSrc</td><td>points to the floating-point input vector </td></tr>
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<tr><td class="paramdir">[out]</td><td class="paramname">*pDst</td><td>points to the Q31 output vector </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">blockSize</td><td>length of the input vector </td></tr>
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</table>
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</dd>
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</dl>
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<dl class="section return"><dt>Returns</dt><dd>none.</dd></dl>
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<dl class="section user"><dt>Description:</dt><dd></dd></dl>
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<dl class="section user"><dt></dt><dd>The equation used for the conversion process is:</dd></dl>
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<pre>
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pDst[n] = (q31_t)(pSrc[n] * 2147483648); 0 <= n < blockSize.
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</pre><p> <b>Scaling and Overflow Behavior:</b> </p>
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<dl class="section user"><dt></dt><dd>The function uses saturating arithmetic. Results outside of the allowable Q31 range[0x80000000 0x7FFFFFFF] will be saturated.</dd></dl>
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<dl class="section note"><dt>Note</dt><dd>In order to apply rounding, the library should be rebuilt with the ROUNDING macro defined in the preprocessor section of project options. </dd></dl>
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<p>References <a class="el" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>, and <a class="el" href="arm__math_8h.html#a9a94b78de0f083bd8fadf3c3abe40431">clip_q63_to_q31()</a>.</p>
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<p>Referenced by <a class="el" href="arm__graphic__equalizer__example__q31_8c.html#a52d2cba30e6946c95578be946ac12a65">main()</a>.</p>
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</div>
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</div>
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<a class="anchor" id="ga44a393818cdee8dce80f2d66add25411"></a>
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<div class="memitem">
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<div class="memproto">
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<tr>
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<td class="memname">void arm_float_to_q7 </td>
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<td>(</td>
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<td class="paramtype"><a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> * </td>
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<td class="paramname"><em>pSrc</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype"><a class="el" href="arm__math_8h.html#ae541b6f232c305361e9b416fc9eed263">q7_t</a> * </td>
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<td class="paramname"><em>pDst</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">uint32_t </td>
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<td class="paramname"><em>blockSize</em> </td>
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</tr>
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<tr>
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<td></td>
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<td>)</td>
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<td></td><td></td>
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</tr>
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</table>
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</div><div class="memdoc">
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramdir">[in]</td><td class="paramname">*pSrc</td><td>points to the floating-point input vector </td></tr>
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<tr><td class="paramdir">[out]</td><td class="paramname">*pDst</td><td>points to the Q7 output vector </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">blockSize</td><td>length of the input vector </td></tr>
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</table>
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</dd>
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</dl>
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<dl class="section return"><dt>Returns</dt><dd>none.</dd></dl>
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<dl class="section user"><dt>Description:</dt><dd></dd></dl>
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<dl class="section user"><dt></dt><dd>The equation used for the conversion process is: <pre>
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pDst[n] = (q7_t)(pSrc[n] * 128); 0 <= n < blockSize.
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</pre> </dd></dl>
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<dl class="section user"><dt>Scaling and Overflow Behavior:</dt><dd></dd></dl>
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<dl class="section user"><dt></dt><dd>The function uses saturating arithmetic. Results outside of the allowable Q7 range [0x80 0x7F] will be saturated. </dd></dl>
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<dl class="section note"><dt>Note</dt><dd>In order to apply rounding, the library should be rebuilt with the ROUNDING macro defined in the preprocessor section of project options. </dd></dl>
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<p>References <a class="el" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>.</p>
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