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| <h1>arm_fir_interpolate_q15.c</h1> </div> |
| </div> |
| <div class="contents"> |
| <a href="arm__fir__interpolate__q15_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_q15.c </span> |
| <a name="l00009"></a>00009 <span class="comment">* </span> |
| <a name="l00010"></a>00010 <span class="comment">* Description: Q15 FIR interpolation. </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="l00062"></a><a class="code" href="group___f_i_r___interpolate.html#ga7962b5f9636e54899f75d0c5936800b5">00062</a> <span class="keywordtype">void</span> <a class="code" href="group___f_i_r___interpolate.html#ga7962b5f9636e54899f75d0c5936800b5" title="Processing function for the Q15 FIR interpolator.">arm_fir_interpolate_q15</a>( |
| <a name="l00063"></a>00063 <span class="keyword">const</span> <a class="code" href="structarm__fir__interpolate__instance__q15.html" title="Instance structure for the Q15 FIR interpolator.">arm_fir_interpolate_instance_q15</a> * S, |
| <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> * pSrc, |
| <a name="l00065"></a>00065 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> * pDst, |
| <a name="l00066"></a>00066 uint32_t <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>) |
| <a name="l00067"></a>00067 { |
| <a name="l00068"></a>00068 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> *pState = S-><a class="code" href="structarm__fir__interpolate__instance__q15.html#a26b864363fa47954248f2590e3a82a3c">pState</a>; <span class="comment">/* State pointer */</span> |
| <a name="l00069"></a>00069 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> *pCoeffs = S-><a class="code" href="structarm__fir__interpolate__instance__q15.html#a767d91d61d4c0beeddd4325d28d28e24">pCoeffs</a>; <span class="comment">/* Coefficient pointer */</span> |
| <a name="l00070"></a>00070 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> *pStateCurnt; <span class="comment">/* Points to the current sample of the state */</span> |
| <a name="l00071"></a>00071 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> *ptr1, *ptr2; <span class="comment">/* Temporary pointers for state and coefficient buffers */</span> |
| <a name="l00072"></a>00072 |
| <a name="l00073"></a>00073 |
| <a name="l00074"></a>00074 <span class="preprocessor">#ifndef ARM_MATH_CM0</span> |
| <a name="l00075"></a>00075 <span class="preprocessor"></span> |
| <a name="l00076"></a>00076 <span class="comment">/* Run the below code for Cortex-M4 and Cortex-M3 */</span> |
| <a name="l00077"></a>00077 |
| <a name="l00078"></a>00078 <a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a> sum0; <span class="comment">/* Accumulators */</span> |
| <a name="l00079"></a>00079 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> x0, c0, c1; <span class="comment">/* Temporary variables to hold state and coefficient values */</span> |
| <a name="l00080"></a>00080 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> c, x; |
| <a name="l00081"></a>00081 uint32_t i, blkCnt, j, tapCnt; <span class="comment">/* Loop counters */</span> |
| <a name="l00082"></a>00082 uint16_t phaseLen = S-><a class="code" href="structarm__fir__interpolate__instance__q15.html#ad5178a02a697a77e0d0e60705d9f0a19">phaseLength</a>; <span class="comment">/* Length of each polyphase filter component */</span> |
| <a name="l00083"></a>00083 |
| <a name="l00084"></a>00084 |
| <a name="l00085"></a>00085 <span class="comment">/* S->pState buffer contains previous frame (phaseLen - 1) samples */</span> |
| <a name="l00086"></a>00086 <span class="comment">/* pStateCurnt points to the location where the new input data should be written */</span> |
| <a name="l00087"></a>00087 pStateCurnt = S-><a class="code" href="structarm__fir__interpolate__instance__q15.html#a26b864363fa47954248f2590e3a82a3c">pState</a> + (phaseLen - 1u); |
| <a name="l00088"></a>00088 |
| <a name="l00089"></a>00089 <span class="comment">/* Total number of intput samples */</span> |
| <a name="l00090"></a>00090 blkCnt = <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>; |
| <a name="l00091"></a>00091 |
| <a name="l00092"></a>00092 <span class="comment">/* Loop over the blockSize. */</span> |
| <a name="l00093"></a>00093 <span class="keywordflow">while</span>(blkCnt > 0u) |
| <a name="l00094"></a>00094 { |
| <a name="l00095"></a>00095 <span class="comment">/* Copy new input sample into the state buffer */</span> |
| <a name="l00096"></a>00096 *pStateCurnt++ = *pSrc++; |
| <a name="l00097"></a>00097 |
| <a name="l00098"></a>00098 <span class="comment">/* Address modifier index of coefficient buffer */</span> |
| <a name="l00099"></a>00099 j = 1u; |
| <a name="l00100"></a>00100 |
| <a name="l00101"></a>00101 <span class="comment">/* Loop over the Interpolation factor. */</span> |
| <a name="l00102"></a>00102 i = S-><a class="code" href="structarm__fir__interpolate__instance__q15.html#a5431bdc079e72a973b51d359f7f13603">L</a>; |
| <a name="l00103"></a>00103 <span class="keywordflow">while</span>(i > 0u) |
| <a name="l00104"></a>00104 { |
| <a name="l00105"></a>00105 <span class="comment">/* Set accumulator to zero */</span> |
| <a name="l00106"></a>00106 sum0 = 0; |
| <a name="l00107"></a>00107 |
| <a name="l00108"></a>00108 <span class="comment">/* Initialize state pointer */</span> |
| <a name="l00109"></a>00109 ptr1 = pState; |
| <a name="l00110"></a>00110 |
| <a name="l00111"></a>00111 <span class="comment">/* Initialize coefficient pointer */</span> |
| <a name="l00112"></a>00112 ptr2 = pCoeffs + (S-><a class="code" href="structarm__fir__interpolate__instance__q15.html#a5431bdc079e72a973b51d359f7f13603">L</a> - j); |
| <a name="l00113"></a>00113 |
| <a name="l00114"></a>00114 <span class="comment">/* Loop over the polyPhase length. Unroll by a factor of 4. </span> |
| <a name="l00115"></a>00115 <span class="comment"> ** Repeat until we've computed numTaps-(4*S->L) coefficients. */</span> |
| <a name="l00116"></a>00116 tapCnt = (uint32_t) phaseLen >> 2u; |
| <a name="l00117"></a>00117 <span class="keywordflow">while</span>(tapCnt > 0u) |
| <a name="l00118"></a>00118 { |
| <a name="l00119"></a>00119 <span class="comment">/* Read the coefficient */</span> |
| <a name="l00120"></a>00120 c0 = *(ptr2); |
| <a name="l00121"></a>00121 |
| <a name="l00122"></a>00122 <span class="comment">/* Upsampling is done by stuffing L-1 zeros between each sample. </span> |
| <a name="l00123"></a>00123 <span class="comment"> * So instead of multiplying zeros with coefficients, </span> |
| <a name="l00124"></a>00124 <span class="comment"> * Increment the coefficient pointer by interpolation factor times. */</span> |
| <a name="l00125"></a>00125 ptr2 += S-><a class="code" href="structarm__fir__interpolate__instance__q15.html#a5431bdc079e72a973b51d359f7f13603">L</a>; |
| <a name="l00126"></a>00126 |
| <a name="l00127"></a>00127 <span class="comment">/* Read the coefficient */</span> |
| <a name="l00128"></a>00128 c1 = *(ptr2); |
| <a name="l00129"></a>00129 |
| <a name="l00130"></a>00130 <span class="comment">/* Increment the coefficient pointer by interpolation factor times. */</span> |
| <a name="l00131"></a>00131 ptr2 += S-><a class="code" href="structarm__fir__interpolate__instance__q15.html#a5431bdc079e72a973b51d359f7f13603">L</a>; |
| <a name="l00132"></a>00132 |
| <a name="l00133"></a>00133 <span class="comment">/* Pack the coefficients */</span> |
| <a name="l00134"></a>00134 <span class="preprocessor">#ifndef ARM_MATH_BIG_ENDIAN</span> |
| <a name="l00135"></a>00135 <span class="preprocessor"></span> |
| <a name="l00136"></a>00136 c = __PKHBT(c0, c1, 16); |
| <a name="l00137"></a>00137 |
| <a name="l00138"></a>00138 <span class="preprocessor">#else</span> |
| <a name="l00139"></a>00139 <span class="preprocessor"></span> |
| <a name="l00140"></a>00140 c = __PKHBT(c1, c0, 16); |
| <a name="l00141"></a>00141 |
| <a name="l00142"></a>00142 <span class="preprocessor">#endif </span><span class="comment">/* #ifndef ARM_MATH_BIG_ENDIAN */</span> |
| <a name="l00143"></a>00143 |
| <a name="l00144"></a>00144 <span class="comment">/* Read twp consecutive input samples */</span> |
| <a name="l00145"></a>00145 x = *<a class="code" href="arm__math_8h.html#a9de2e0a5785be82866bcb96012282248" title="definition to read/write two 16 bit values.">__SIMD32</a>(ptr1)++; |
| <a name="l00146"></a>00146 |
| <a name="l00147"></a>00147 <span class="comment">/* Perform the multiply-accumulate */</span> |
| <a name="l00148"></a>00148 sum0 = __SMLALD(x, c, sum0); |
| <a name="l00149"></a>00149 |
| <a name="l00150"></a>00150 <span class="comment">/* Read the coefficient */</span> |
| <a name="l00151"></a>00151 c0 = *(ptr2); |
| <a name="l00152"></a>00152 |
| <a name="l00153"></a>00153 <span class="comment">/* Upsampling is done by stuffing L-1 zeros between each sample. </span> |
| <a name="l00154"></a>00154 <span class="comment"> * So insted of multiplying zeros with coefficients, </span> |
| <a name="l00155"></a>00155 <span class="comment"> * Increment the coefficient pointer by interpolation factor times. */</span> |
| <a name="l00156"></a>00156 ptr2 += S-><a class="code" href="structarm__fir__interpolate__instance__q15.html#a5431bdc079e72a973b51d359f7f13603">L</a>; |
| <a name="l00157"></a>00157 |
| <a name="l00158"></a>00158 <span class="comment">/* Read the coefficient */</span> |
| <a name="l00159"></a>00159 c1 = *(ptr2); |
| <a name="l00160"></a>00160 |
| <a name="l00161"></a>00161 <span class="comment">/* Increment the coefficient pointer by interpolation factor times. */</span> |
| <a name="l00162"></a>00162 ptr2 += S-><a class="code" href="structarm__fir__interpolate__instance__q15.html#a5431bdc079e72a973b51d359f7f13603">L</a>; |
| <a name="l00163"></a>00163 |
| <a name="l00164"></a>00164 <span class="comment">/* Pack the coefficients */</span> |
| <a name="l00165"></a>00165 <span class="preprocessor">#ifndef ARM_MATH_BIG_ENDIAN</span> |
| <a name="l00166"></a>00166 <span class="preprocessor"></span> |
| <a name="l00167"></a>00167 c = __PKHBT(c0, c1, 16); |
| <a name="l00168"></a>00168 |
| <a name="l00169"></a>00169 <span class="preprocessor">#else</span> |
| <a name="l00170"></a>00170 <span class="preprocessor"></span> |
| <a name="l00171"></a>00171 c = __PKHBT(c1, c0, 16); |
| <a name="l00172"></a>00172 |
| <a name="l00173"></a>00173 <span class="preprocessor">#endif </span><span class="comment">/* #ifndef ARM_MATH_BIG_ENDIAN */</span> |
| <a name="l00174"></a>00174 |
| <a name="l00175"></a>00175 <span class="comment">/* Read twp consecutive input samples */</span> |
| <a name="l00176"></a>00176 x = *<a class="code" href="arm__math_8h.html#a9de2e0a5785be82866bcb96012282248" title="definition to read/write two 16 bit values.">__SIMD32</a>(ptr1)++; |
| <a name="l00177"></a>00177 |
| <a name="l00178"></a>00178 <span class="comment">/* Perform the multiply-accumulate */</span> |
| <a name="l00179"></a>00179 sum0 = __SMLALD(x, c, sum0); |
| <a name="l00180"></a>00180 |
| <a name="l00181"></a>00181 <span class="comment">/* Decrement the loop counter */</span> |
| <a name="l00182"></a>00182 tapCnt--; |
| <a name="l00183"></a>00183 } |
| <a name="l00184"></a>00184 |
| <a name="l00185"></a>00185 <span class="comment">/* If the polyPhase length is not a multiple of 4, compute the remaining filter taps */</span> |
| <a name="l00186"></a>00186 tapCnt = (uint32_t) phaseLen & 0x3u; |
| <a name="l00187"></a>00187 |
| <a name="l00188"></a>00188 <span class="keywordflow">while</span>(tapCnt > 0u) |
| <a name="l00189"></a>00189 { |
| <a name="l00190"></a>00190 <span class="comment">/* Read the coefficient */</span> |
| <a name="l00191"></a>00191 c0 = *(ptr2); |
| <a name="l00192"></a>00192 |
| <a name="l00193"></a>00193 <span class="comment">/* Increment the coefficient pointer by interpolation factor times. */</span> |
| <a name="l00194"></a>00194 ptr2 += S-><a class="code" href="structarm__fir__interpolate__instance__q15.html#a5431bdc079e72a973b51d359f7f13603">L</a>; |
| <a name="l00195"></a>00195 |
| <a name="l00196"></a>00196 <span class="comment">/* Read the input sample */</span> |
| <a name="l00197"></a>00197 x0 = *(ptr1++); |
| <a name="l00198"></a>00198 |
| <a name="l00199"></a>00199 <span class="comment">/* Perform the multiply-accumulate */</span> |
| <a name="l00200"></a>00200 sum0 = __SMLALD(x0, c0, sum0); |
| <a name="l00201"></a>00201 |
| <a name="l00202"></a>00202 <span class="comment">/* Decrement the loop counter */</span> |
| <a name="l00203"></a>00203 tapCnt--; |
| <a name="l00204"></a>00204 } |
| <a name="l00205"></a>00205 |
| <a name="l00206"></a>00206 <span class="comment">/* The result is in the accumulator, store in the destination buffer. */</span> |
| <a name="l00207"></a>00207 *pDst++ = (<a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a>) (__SSAT((sum0 >> 15), 16)); |
| <a name="l00208"></a>00208 |
| <a name="l00209"></a>00209 <span class="comment">/* Increment the address modifier index of coefficient buffer */</span> |
| <a name="l00210"></a>00210 j++; |
| <a name="l00211"></a>00211 |
| <a name="l00212"></a>00212 <span class="comment">/* Decrement the loop counter */</span> |
| <a name="l00213"></a>00213 i--; |
| <a name="l00214"></a>00214 } |
| <a name="l00215"></a>00215 |
| <a name="l00216"></a>00216 <span class="comment">/* Advance the state pointer by 1 </span> |
| <a name="l00217"></a>00217 <span class="comment"> * to process the next group of interpolation factor number samples */</span> |
| <a name="l00218"></a>00218 pState = pState + 1; |
| <a name="l00219"></a>00219 |
| <a name="l00220"></a>00220 <span class="comment">/* Decrement the loop counter */</span> |
| <a name="l00221"></a>00221 blkCnt--; |
| <a name="l00222"></a>00222 } |
| <a name="l00223"></a>00223 |
| <a name="l00224"></a>00224 <span class="comment">/* Processing is complete. </span> |
| <a name="l00225"></a>00225 <span class="comment"> ** Now copy the last phaseLen - 1 samples to the satrt of the state buffer. </span> |
| <a name="l00226"></a>00226 <span class="comment"> ** This prepares the state buffer for the next function call. */</span> |
| <a name="l00227"></a>00227 |
| <a name="l00228"></a>00228 <span class="comment">/* Points to the start of the state buffer */</span> |
| <a name="l00229"></a>00229 pStateCurnt = S-><a class="code" href="structarm__fir__interpolate__instance__q15.html#a26b864363fa47954248f2590e3a82a3c">pState</a>; |
| <a name="l00230"></a>00230 |
| <a name="l00231"></a>00231 i = ((uint32_t) phaseLen - 1u) >> 2u; |
| <a name="l00232"></a>00232 |
| <a name="l00233"></a>00233 <span class="comment">/* copy data */</span> |
| <a name="l00234"></a>00234 <span class="keywordflow">while</span>(i > 0u) |
| <a name="l00235"></a>00235 { |
| <a name="l00236"></a>00236 *<a class="code" href="arm__math_8h.html#a9de2e0a5785be82866bcb96012282248" title="definition to read/write two 16 bit values.">__SIMD32</a>(pStateCurnt)++ = *<a class="code" href="arm__math_8h.html#a9de2e0a5785be82866bcb96012282248" title="definition to read/write two 16 bit values.">__SIMD32</a>(pState)++; |
| <a name="l00237"></a>00237 *<a class="code" href="arm__math_8h.html#a9de2e0a5785be82866bcb96012282248" title="definition to read/write two 16 bit values.">__SIMD32</a>(pStateCurnt)++ = *<a class="code" href="arm__math_8h.html#a9de2e0a5785be82866bcb96012282248" title="definition to read/write two 16 bit values.">__SIMD32</a>(pState)++; |
| <a name="l00238"></a>00238 |
| <a name="l00239"></a>00239 <span class="comment">/* Decrement the loop counter */</span> |
| <a name="l00240"></a>00240 i--; |
| <a name="l00241"></a>00241 } |
| <a name="l00242"></a>00242 |
| <a name="l00243"></a>00243 i = ((uint32_t) phaseLen - 1u) % 0x04u; |
| <a name="l00244"></a>00244 |
| <a name="l00245"></a>00245 <span class="keywordflow">while</span>(i > 0u) |
| <a name="l00246"></a>00246 { |
| <a name="l00247"></a>00247 *pStateCurnt++ = *pState++; |
| <a name="l00248"></a>00248 |
| <a name="l00249"></a>00249 <span class="comment">/* Decrement the loop counter */</span> |
| <a name="l00250"></a>00250 i--; |
| <a name="l00251"></a>00251 } |
| <a name="l00252"></a>00252 |
| <a name="l00253"></a>00253 <span class="preprocessor">#else</span> |
| <a name="l00254"></a>00254 <span class="preprocessor"></span> |
| <a name="l00255"></a>00255 <span class="comment">/* Run the below code for Cortex-M0 */</span> |
| <a name="l00256"></a>00256 |
| <a name="l00257"></a>00257 <a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a> sum; <span class="comment">/* Accumulator */</span> |
| <a name="l00258"></a>00258 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> x0, c0; <span class="comment">/* Temporary variables to hold state and coefficient values */</span> |
| <a name="l00259"></a>00259 uint32_t i, blkCnt, tapCnt; <span class="comment">/* Loop counters */</span> |
| <a name="l00260"></a>00260 uint16_t phaseLen = S-><a class="code" href="structarm__fir__interpolate__instance__q15.html#ad5178a02a697a77e0d0e60705d9f0a19">phaseLength</a>; <span class="comment">/* Length of each polyphase filter component */</span> |
| <a name="l00261"></a>00261 |
| <a name="l00262"></a>00262 |
| <a name="l00263"></a>00263 <span class="comment">/* S->pState buffer contains previous frame (phaseLen - 1) samples */</span> |
| <a name="l00264"></a>00264 <span class="comment">/* pStateCurnt points to the location where the new input data should be written */</span> |
| <a name="l00265"></a>00265 pStateCurnt = S-><a class="code" href="structarm__fir__interpolate__instance__q15.html#a26b864363fa47954248f2590e3a82a3c">pState</a> + (phaseLen - 1u); |
| <a name="l00266"></a>00266 |
| <a name="l00267"></a>00267 <span class="comment">/* Total number of intput samples */</span> |
| <a name="l00268"></a>00268 blkCnt = <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>; |
| <a name="l00269"></a>00269 |
| <a name="l00270"></a>00270 <span class="comment">/* Loop over the blockSize. */</span> |
| <a name="l00271"></a>00271 <span class="keywordflow">while</span>(blkCnt > 0u) |
| <a name="l00272"></a>00272 { |
| <a name="l00273"></a>00273 <span class="comment">/* Copy new input sample into the state buffer */</span> |
| <a name="l00274"></a>00274 *pStateCurnt++ = *pSrc++; |
| <a name="l00275"></a>00275 |
| <a name="l00276"></a>00276 <span class="comment">/* Loop over the Interpolation factor. */</span> |
| <a name="l00277"></a>00277 i = S-><a class="code" href="structarm__fir__interpolate__instance__q15.html#a5431bdc079e72a973b51d359f7f13603">L</a>; |
| <a name="l00278"></a>00278 |
| <a name="l00279"></a>00279 <span class="keywordflow">while</span>(i > 0u) |
| <a name="l00280"></a>00280 { |
| <a name="l00281"></a>00281 <span class="comment">/* Set accumulator to zero */</span> |
| <a name="l00282"></a>00282 sum = 0; |
| <a name="l00283"></a>00283 |
| <a name="l00284"></a>00284 <span class="comment">/* Initialize state pointer */</span> |
| <a name="l00285"></a>00285 ptr1 = pState; |
| <a name="l00286"></a>00286 |
| <a name="l00287"></a>00287 <span class="comment">/* Initialize coefficient pointer */</span> |
| <a name="l00288"></a>00288 ptr2 = pCoeffs + (i - 1u); |
| <a name="l00289"></a>00289 |
| <a name="l00290"></a>00290 <span class="comment">/* Loop over the polyPhase length */</span> |
| <a name="l00291"></a>00291 tapCnt = (uint32_t) phaseLen; |
| <a name="l00292"></a>00292 |
| <a name="l00293"></a>00293 <span class="keywordflow">while</span>(tapCnt > 0u) |
| <a name="l00294"></a>00294 { |
| <a name="l00295"></a>00295 <span class="comment">/* Read the coefficient */</span> |
| <a name="l00296"></a>00296 c0 = *ptr2; |
| <a name="l00297"></a>00297 |
| <a name="l00298"></a>00298 <span class="comment">/* Increment the coefficient pointer by interpolation factor times. */</span> |
| <a name="l00299"></a>00299 ptr2 += S-><a class="code" href="structarm__fir__interpolate__instance__q15.html#a5431bdc079e72a973b51d359f7f13603">L</a>; |
| <a name="l00300"></a>00300 |
| <a name="l00301"></a>00301 <span class="comment">/* Read the input sample */</span> |
| <a name="l00302"></a>00302 x0 = *ptr1++; |
| <a name="l00303"></a>00303 |
| <a name="l00304"></a>00304 <span class="comment">/* Perform the multiply-accumulate */</span> |
| <a name="l00305"></a>00305 sum += ((<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) x0 * c0); |
| <a name="l00306"></a>00306 |
| <a name="l00307"></a>00307 <span class="comment">/* Decrement the loop counter */</span> |
| <a name="l00308"></a>00308 tapCnt--; |
| <a name="l00309"></a>00309 } |
| <a name="l00310"></a>00310 |
| <a name="l00311"></a>00311 <span class="comment">/* Store the result after converting to 1.15 format in the destination buffer */</span> |
| <a name="l00312"></a>00312 *pDst++ = (<a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a>) (__SSAT((sum >> 15), 16)); |
| <a name="l00313"></a>00313 |
| <a name="l00314"></a>00314 <span class="comment">/* Decrement the loop counter */</span> |
| <a name="l00315"></a>00315 i--; |
| <a name="l00316"></a>00316 } |
| <a name="l00317"></a>00317 |
| <a name="l00318"></a>00318 <span class="comment">/* Advance the state pointer by 1 </span> |
| <a name="l00319"></a>00319 <span class="comment"> * to process the next group of interpolation factor number samples */</span> |
| <a name="l00320"></a>00320 pState = pState + 1; |
| <a name="l00321"></a>00321 |
| <a name="l00322"></a>00322 <span class="comment">/* Decrement the loop counter */</span> |
| <a name="l00323"></a>00323 blkCnt--; |
| <a name="l00324"></a>00324 } |
| <a name="l00325"></a>00325 |
| <a name="l00326"></a>00326 <span class="comment">/* Processing is complete. </span> |
| <a name="l00327"></a>00327 <span class="comment"> ** Now copy the last phaseLen - 1 samples to the start of the state buffer. </span> |
| <a name="l00328"></a>00328 <span class="comment"> ** This prepares the state buffer for the next function call. */</span> |
| <a name="l00329"></a>00329 |
| <a name="l00330"></a>00330 <span class="comment">/* Points to the start of the state buffer */</span> |
| <a name="l00331"></a>00331 pStateCurnt = S-><a class="code" href="structarm__fir__interpolate__instance__q15.html#a26b864363fa47954248f2590e3a82a3c">pState</a>; |
| <a name="l00332"></a>00332 |
| <a name="l00333"></a>00333 i = (uint32_t) phaseLen - 1u; |
| <a name="l00334"></a>00334 |
| <a name="l00335"></a>00335 <span class="keywordflow">while</span>(i > 0u) |
| <a name="l00336"></a>00336 { |
| <a name="l00337"></a>00337 *pStateCurnt++ = *pState++; |
| <a name="l00338"></a>00338 |
| <a name="l00339"></a>00339 <span class="comment">/* Decrement the loop counter */</span> |
| <a name="l00340"></a>00340 i--; |
| <a name="l00341"></a>00341 } |
| <a name="l00342"></a>00342 |
| <a name="l00343"></a>00343 <span class="preprocessor">#endif </span><span class="comment">/* #ifndef ARM_MATH_CM0 */</span> |
| <a name="l00344"></a>00344 |
| <a name="l00345"></a>00345 } |
| <a name="l00346"></a>00346 |
| </pre></div></div> |
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