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49 <div class="headertitle">
50 <h1>arm_fir_sparse_q15.c</h1> </div>
52 <div class="contents">
53 <a href="arm__fir__sparse__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>
54 <a name="l00002"></a>00002 <span class="comment">* Copyright (C) 2010 ARM Limited. All rights reserved. </span>
55 <a name="l00003"></a>00003 <span class="comment">* </span>
56 <a name="l00004"></a>00004 <span class="comment">* $Date: 15. July 2011 </span>
57 <a name="l00005"></a>00005 <span class="comment">* $Revision: V1.0.10 </span>
58 <a name="l00006"></a>00006 <span class="comment">* </span>
59 <a name="l00007"></a>00007 <span class="comment">* Project: CMSIS DSP Library </span>
60 <a name="l00008"></a>00008 <span class="comment">* Title: arm_fir_sparse_q15.c </span>
61 <a name="l00009"></a>00009 <span class="comment">* </span>
62 <a name="l00010"></a>00010 <span class="comment">* Description: Q15 sparse FIR filter processing function. </span>
63 <a name="l00011"></a>00011 <span class="comment">* </span>
64 <a name="l00012"></a>00012 <span class="comment">* Target Processor: Cortex-M4/Cortex-M3/Cortex-M0</span>
65 <a name="l00013"></a>00013 <span class="comment">* </span>
66 <a name="l00014"></a>00014 <span class="comment">* Version 1.0.10 2011/7/15 </span>
67 <a name="l00015"></a>00015 <span class="comment">* Big Endian support added and Merged M0 and M3/M4 Source code. </span>
68 <a name="l00016"></a>00016 <span class="comment">* </span>
69 <a name="l00017"></a>00017 <span class="comment">* Version 1.0.3 2010/11/29 </span>
70 <a name="l00018"></a>00018 <span class="comment">* Re-organized the CMSIS folders and updated documentation. </span>
71 <a name="l00019"></a>00019 <span class="comment">* </span>
72 <a name="l00020"></a>00020 <span class="comment">* Version 1.0.2 2010/11/11 </span>
73 <a name="l00021"></a>00021 <span class="comment">* Documentation updated. </span>
74 <a name="l00022"></a>00022 <span class="comment">* </span>
75 <a name="l00023"></a>00023 <span class="comment">* Version 1.0.1 2010/10/05 </span>
76 <a name="l00024"></a>00024 <span class="comment">* Production release and review comments incorporated. </span>
77 <a name="l00025"></a>00025 <span class="comment">* </span>
78 <a name="l00026"></a>00026 <span class="comment">* Version 1.0.0 2010/09/20 </span>
79 <a name="l00027"></a>00027 <span class="comment">* Production release and review comments incorporated </span>
80 <a name="l00028"></a>00028 <span class="comment">* </span>
81 <a name="l00029"></a>00029 <span class="comment">* Version 0.0.7 2010/06/10 </span>
82 <a name="l00030"></a>00030 <span class="comment">* Misra-C changes done </span>
83 <a name="l00031"></a>00031 <span class="comment">* ------------------------------------------------------------------- */</span>
84 <a name="l00032"></a>00032 <span class="preprocessor">#include "<a class="code" href="arm__math_8h.html">arm_math.h</a>"</span>
85 <a name="l00033"></a>00033
86 <a name="l00060"></a><a class="code" href="group___f_i_r___sparse.html#ga2bffda2e156e72427e19276cd9c3d3cc">00060</a> <span class="keywordtype">void</span> <a class="code" href="group___f_i_r___sparse.html#ga2bffda2e156e72427e19276cd9c3d3cc" title="Processing function for the Q15 sparse FIR filter.">arm_fir_sparse_q15</a>(
87 <a name="l00061"></a>00061 <a class="code" href="structarm__fir__sparse__instance__q15.html" title="Instance structure for the Q15 sparse FIR filter.">arm_fir_sparse_instance_q15</a> * S,
88 <a name="l00062"></a>00062 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> * pSrc,
89 <a name="l00063"></a>00063 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> * pDst,
90 <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> * pScratchIn,
91 <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> * pScratchOut,
92 <a name="l00066"></a>00066 uint32_t <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>)
93 <a name="l00067"></a>00067 {
94 <a name="l00068"></a>00068
95 <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> *pState = S-><a class="code" href="structarm__fir__sparse__instance__q15.html#a98b92b0f5208110129b9a67b1db90408">pState</a>; <span class="comment">/* State pointer */</span>
96 <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> *pIn = pSrc; <span class="comment">/* Working pointer for input */</span>
97 <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> *pOut = pDst; <span class="comment">/* Working pointer for output */</span>
98 <a name="l00072"></a>00072 <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__sparse__instance__q15.html#a78a6565473b5f0b8c77c3f0f58a76069">pCoeffs</a>; <span class="comment">/* Coefficient pointer */</span>
99 <a name="l00073"></a>00073 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> *px; <span class="comment">/* Temporary pointers for scratch buffer */</span>
100 <a name="l00074"></a>00074 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> *pb = pScratchIn; <span class="comment">/* Temporary pointers for scratch buffer */</span>
101 <a name="l00075"></a>00075 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> *py = pState; <span class="comment">/* Temporary pointers for state buffer */</span>
102 <a name="l00076"></a>00076 int32_t *pTapDelay = S-><a class="code" href="structarm__fir__sparse__instance__q15.html#aeab2855176c6efdb231a73a3672837d5">pTapDelay</a>; <span class="comment">/* Pointer to the array containing offset of the non-zero tap values. */</span>
103 <a name="l00077"></a>00077 uint32_t delaySize = S-><a class="code" href="structarm__fir__sparse__instance__q15.html#ad14cc1070eecf7e1926d8f67a8273182">maxDelay</a> + <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>; <span class="comment">/* state length */</span>
104 <a name="l00078"></a>00078 uint16_t numTaps = S-><a class="code" href="structarm__fir__sparse__instance__q15.html#a0f66b126dd8b85f7467cfb01b7bc4d77">numTaps</a>; <span class="comment">/* Filter order */</span>
105 <a name="l00079"></a>00079 int32_t readIndex; <span class="comment">/* Read index of the state buffer */</span>
106 <a name="l00080"></a>00080 uint32_t tapCnt, blkCnt; <span class="comment">/* loop counters */</span>
107 <a name="l00081"></a>00081 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> coeff = *pCoeffs++; <span class="comment">/* Read the first coefficient value */</span>
108 <a name="l00082"></a>00082 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> *pScr2 = pScratchOut; <span class="comment">/* Working pointer for pScratchOut */</span>
109 <a name="l00083"></a>00083
110 <a name="l00084"></a>00084
111 <a name="l00085"></a>00085 <span class="preprocessor">#ifndef ARM_MATH_CM0</span>
112 <a name="l00086"></a>00086 <span class="preprocessor"></span>
113 <a name="l00087"></a>00087 <span class="comment">/* Run the below code for Cortex-M4 and Cortex-M3 */</span>
114 <a name="l00088"></a>00088
115 <a name="l00089"></a>00089 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> in1, in2; <span class="comment">/* Temporary variables */</span>
116 <a name="l00090"></a>00090
117 <a name="l00091"></a>00091
118 <a name="l00092"></a>00092 <span class="comment">/* BlockSize of Input samples are copied into the state buffer */</span>
119 <a name="l00093"></a>00093 <span class="comment">/* StateIndex points to the starting position to write in the state buffer */</span>
120 <a name="l00094"></a>00094 <a class="code" href="arm__math_8h.html#a3ba2d215477e692def7fda46dda883ed" title="Q15 Circular write function.">arm_circularWrite_q15</a>(py, delaySize, &S-><a class="code" href="structarm__fir__sparse__instance__q15.html#a89487f28cab52637426024005e478985">stateIndex</a>, 1, pIn, 1, blockSize);
121 <a name="l00095"></a>00095
122 <a name="l00096"></a>00096 <span class="comment">/* Loop over the number of taps. */</span>
123 <a name="l00097"></a>00097 tapCnt = numTaps;
124 <a name="l00098"></a>00098
125 <a name="l00099"></a>00099 <span class="comment">/* Read Index, from where the state buffer should be read, is calculated. */</span>
126 <a name="l00100"></a>00100 readIndex = (S-><a class="code" href="structarm__fir__sparse__instance__q15.html#a89487f28cab52637426024005e478985">stateIndex</a> - <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>) - *pTapDelay++;
127 <a name="l00101"></a>00101
128 <a name="l00102"></a>00102 <span class="comment">/* Wraparound of readIndex */</span>
129 <a name="l00103"></a>00103 <span class="keywordflow">if</span>(readIndex < 0)
130 <a name="l00104"></a>00104 {
131 <a name="l00105"></a>00105 readIndex += (int32_t) delaySize;
132 <a name="l00106"></a>00106 }
133 <a name="l00107"></a>00107
134 <a name="l00108"></a>00108 <span class="comment">/* Working pointer for state buffer is updated */</span>
135 <a name="l00109"></a>00109 py = pState;
136 <a name="l00110"></a>00110
137 <a name="l00111"></a>00111 <span class="comment">/* blockSize samples are read from the state buffer */</span>
138 <a name="l00112"></a>00112 <a class="code" href="arm__math_8h.html#ad5fb134f83f2c802261f172e3dceb131" title="Q15 Circular Read function.">arm_circularRead_q15</a>(py, delaySize, &readIndex, 1,
139 <a name="l00113"></a>00113 pb, pb, blockSize, 1, blockSize);
140 <a name="l00114"></a>00114
141 <a name="l00115"></a>00115 <span class="comment">/* Working pointer for the scratch buffer of state values */</span>
142 <a name="l00116"></a>00116 px = pb;
143 <a name="l00117"></a>00117
144 <a name="l00118"></a>00118 <span class="comment">/* Working pointer for scratch buffer of output values */</span>
145 <a name="l00119"></a>00119 pScratchOut = pScr2;
146 <a name="l00120"></a>00120
147 <a name="l00121"></a>00121 <span class="comment">/* Loop over the blockSize. Unroll by a factor of 4. </span>
148 <a name="l00122"></a>00122 <span class="comment"> * Compute 4 multiplications at a time. */</span>
149 <a name="l00123"></a>00123 blkCnt = blockSize >> 2;
150 <a name="l00124"></a>00124
151 <a name="l00125"></a>00125 <span class="keywordflow">while</span>(blkCnt > 0u)
152 <a name="l00126"></a>00126 {
153 <a name="l00127"></a>00127 <span class="comment">/* Perform multiplication and store in the scratch buffer */</span>
154 <a name="l00128"></a>00128 *pScratchOut++ = ((<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) * px++ * coeff);
155 <a name="l00129"></a>00129 *pScratchOut++ = ((<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) * px++ * coeff);
156 <a name="l00130"></a>00130 *pScratchOut++ = ((<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) * px++ * coeff);
157 <a name="l00131"></a>00131 *pScratchOut++ = ((<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) * px++ * coeff);
158 <a name="l00132"></a>00132
159 <a name="l00133"></a>00133 <span class="comment">/* Decrement the loop counter */</span>
160 <a name="l00134"></a>00134 blkCnt--;
161 <a name="l00135"></a>00135 }
162 <a name="l00136"></a>00136
163 <a name="l00137"></a>00137 <span class="comment">/* If the blockSize is not a multiple of 4, </span>
164 <a name="l00138"></a>00138 <span class="comment"> * compute the remaining samples */</span>
165 <a name="l00139"></a>00139 blkCnt = blockSize % 0x4u;
166 <a name="l00140"></a>00140
167 <a name="l00141"></a>00141 <span class="keywordflow">while</span>(blkCnt > 0u)
168 <a name="l00142"></a>00142 {
169 <a name="l00143"></a>00143 <span class="comment">/* Perform multiplication and store in the scratch buffer */</span>
170 <a name="l00144"></a>00144 *pScratchOut++ = ((<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) * px++ * coeff);
171 <a name="l00145"></a>00145
172 <a name="l00146"></a>00146 <span class="comment">/* Decrement the loop counter */</span>
173 <a name="l00147"></a>00147 blkCnt--;
174 <a name="l00148"></a>00148 }
175 <a name="l00149"></a>00149
176 <a name="l00150"></a>00150 <span class="comment">/* Load the coefficient value and </span>
177 <a name="l00151"></a>00151 <span class="comment"> * increment the coefficient buffer for the next set of state values */</span>
178 <a name="l00152"></a>00152 coeff = *pCoeffs++;
179 <a name="l00153"></a>00153
180 <a name="l00154"></a>00154 <span class="comment">/* Read Index, from where the state buffer should be read, is calculated. */</span>
181 <a name="l00155"></a>00155 readIndex = (S-><a class="code" href="structarm__fir__sparse__instance__q15.html#a89487f28cab52637426024005e478985">stateIndex</a> - <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>) - *pTapDelay++;
182 <a name="l00156"></a>00156
183 <a name="l00157"></a>00157 <span class="comment">/* Wraparound of readIndex */</span>
184 <a name="l00158"></a>00158 <span class="keywordflow">if</span>(readIndex < 0)
185 <a name="l00159"></a>00159 {
186 <a name="l00160"></a>00160 readIndex += (int32_t) delaySize;
187 <a name="l00161"></a>00161 }
188 <a name="l00162"></a>00162
189 <a name="l00163"></a>00163 <span class="comment">/* Loop over the number of taps. */</span>
190 <a name="l00164"></a>00164 tapCnt = (uint32_t) numTaps - 1u;
191 <a name="l00165"></a>00165
192 <a name="l00166"></a>00166 <span class="keywordflow">while</span>(tapCnt > 0u)
193 <a name="l00167"></a>00167 {
194 <a name="l00168"></a>00168 <span class="comment">/* Working pointer for state buffer is updated */</span>
195 <a name="l00169"></a>00169 py = pState;
196 <a name="l00170"></a>00170
197 <a name="l00171"></a>00171 <span class="comment">/* blockSize samples are read from the state buffer */</span>
198 <a name="l00172"></a>00172 <a class="code" href="arm__math_8h.html#ad5fb134f83f2c802261f172e3dceb131" title="Q15 Circular Read function.">arm_circularRead_q15</a>(py, delaySize, &readIndex, 1,
199 <a name="l00173"></a>00173 pb, pb, blockSize, 1, blockSize);
200 <a name="l00174"></a>00174
201 <a name="l00175"></a>00175 <span class="comment">/* Working pointer for the scratch buffer of state values */</span>
202 <a name="l00176"></a>00176 px = pb;
203 <a name="l00177"></a>00177
204 <a name="l00178"></a>00178 <span class="comment">/* Working pointer for scratch buffer of output values */</span>
205 <a name="l00179"></a>00179 pScratchOut = pScr2;
206 <a name="l00180"></a>00180
207 <a name="l00181"></a>00181 <span class="comment">/* Loop over the blockSize. Unroll by a factor of 4. </span>
208 <a name="l00182"></a>00182 <span class="comment"> * Compute 4 MACS at a time. */</span>
209 <a name="l00183"></a>00183 blkCnt = blockSize >> 2;
210 <a name="l00184"></a>00184
211 <a name="l00185"></a>00185 <span class="keywordflow">while</span>(blkCnt > 0u)
212 <a name="l00186"></a>00186 {
213 <a name="l00187"></a>00187 <span class="comment">/* Perform Multiply-Accumulate */</span>
214 <a name="l00188"></a>00188 *pScratchOut++ += (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) * px++ * coeff;
215 <a name="l00189"></a>00189 *pScratchOut++ += (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) * px++ * coeff;
216 <a name="l00190"></a>00190 *pScratchOut++ += (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) * px++ * coeff;
217 <a name="l00191"></a>00191 *pScratchOut++ += (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) * px++ * coeff;
218 <a name="l00192"></a>00192
219 <a name="l00193"></a>00193 <span class="comment">/* Decrement the loop counter */</span>
220 <a name="l00194"></a>00194 blkCnt--;
221 <a name="l00195"></a>00195 }
222 <a name="l00196"></a>00196
223 <a name="l00197"></a>00197 <span class="comment">/* If the blockSize is not a multiple of 4, </span>
224 <a name="l00198"></a>00198 <span class="comment"> * compute the remaining samples */</span>
225 <a name="l00199"></a>00199 blkCnt = blockSize % 0x4u;
226 <a name="l00200"></a>00200
227 <a name="l00201"></a>00201 <span class="keywordflow">while</span>(blkCnt > 0u)
228 <a name="l00202"></a>00202 {
229 <a name="l00203"></a>00203 <span class="comment">/* Perform Multiply-Accumulate */</span>
230 <a name="l00204"></a>00204 *pScratchOut++ += (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) * px++ * coeff;
231 <a name="l00205"></a>00205
232 <a name="l00206"></a>00206 <span class="comment">/* Decrement the loop counter */</span>
233 <a name="l00207"></a>00207 blkCnt--;
234 <a name="l00208"></a>00208 }
235 <a name="l00209"></a>00209
236 <a name="l00210"></a>00210 <span class="comment">/* Load the coefficient value and </span>
237 <a name="l00211"></a>00211 <span class="comment"> * increment the coefficient buffer for the next set of state values */</span>
238 <a name="l00212"></a>00212 coeff = *pCoeffs++;
239 <a name="l00213"></a>00213
240 <a name="l00214"></a>00214 <span class="comment">/* Read Index, from where the state buffer should be read, is calculated. */</span>
241 <a name="l00215"></a>00215 readIndex = (S-><a class="code" href="structarm__fir__sparse__instance__q15.html#a89487f28cab52637426024005e478985">stateIndex</a> - <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>) - *pTapDelay++;
242 <a name="l00216"></a>00216
243 <a name="l00217"></a>00217 <span class="comment">/* Wraparound of readIndex */</span>
244 <a name="l00218"></a>00218 <span class="keywordflow">if</span>(readIndex < 0)
245 <a name="l00219"></a>00219 {
246 <a name="l00220"></a>00220 readIndex += (int32_t) delaySize;
247 <a name="l00221"></a>00221 }
248 <a name="l00222"></a>00222
249 <a name="l00223"></a>00223 <span class="comment">/* Decrement the tap loop counter */</span>
250 <a name="l00224"></a>00224 tapCnt--;
251 <a name="l00225"></a>00225 }
252 <a name="l00226"></a>00226
253 <a name="l00227"></a>00227 <span class="comment">/* All the output values are in pScratchOut buffer. </span>
254 <a name="l00228"></a>00228 <span class="comment"> Convert them into 1.15 format, saturate and store in the destination buffer. */</span>
255 <a name="l00229"></a>00229 <span class="comment">/* Loop over the blockSize. */</span>
256 <a name="l00230"></a>00230 blkCnt = blockSize >> 2;
257 <a name="l00231"></a>00231
258 <a name="l00232"></a>00232 <span class="keywordflow">while</span>(blkCnt > 0u)
259 <a name="l00233"></a>00233 {
260 <a name="l00234"></a>00234 in1 = *pScr2++;
261 <a name="l00235"></a>00235 in2 = *pScr2++;
262 <a name="l00236"></a>00236
263 <a name="l00237"></a>00237 <span class="preprocessor">#ifndef ARM_MATH_BIG_ENDIAN</span>
264 <a name="l00238"></a>00238 <span class="preprocessor"></span>
265 <a name="l00239"></a>00239 *<a class="code" href="arm__math_8h.html#a9de2e0a5785be82866bcb96012282248" title="definition to read/write two 16 bit values.">__SIMD32</a>(pOut)++ =
266 <a name="l00240"></a>00240 __PKHBT((<a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a>) __SSAT(in1 >> 15, 16), (<a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a>) __SSAT(in2 >> 15, 16),
267 <a name="l00241"></a>00241 16);
268 <a name="l00242"></a>00242
269 <a name="l00243"></a>00243 <span class="preprocessor">#else</span>
270 <a name="l00244"></a>00244 <span class="preprocessor"></span> *<a class="code" href="arm__math_8h.html#a9de2e0a5785be82866bcb96012282248" title="definition to read/write two 16 bit values.">__SIMD32</a>(pOut)++ =
271 <a name="l00245"></a>00245 __PKHBT((<a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a>) __SSAT(in2 >> 15, 16), (<a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a>) __SSAT(in1 >> 15, 16),
272 <a name="l00246"></a>00246 16);
273 <a name="l00247"></a>00247
274 <a name="l00248"></a>00248 <span class="preprocessor">#endif </span><span class="comment">/* #ifndef ARM_MATH_BIG_ENDIAN */</span>
275 <a name="l00249"></a>00249
276 <a name="l00250"></a>00250 in1 = *pScr2++;
277 <a name="l00251"></a>00251
278 <a name="l00252"></a>00252 in2 = *pScr2++;
279 <a name="l00253"></a>00253
280 <a name="l00254"></a>00254 <span class="preprocessor">#ifndef ARM_MATH_BIG_ENDIAN</span>
281 <a name="l00255"></a>00255 <span class="preprocessor"></span>
282 <a name="l00256"></a>00256 *<a class="code" href="arm__math_8h.html#a9de2e0a5785be82866bcb96012282248" title="definition to read/write two 16 bit values.">__SIMD32</a>(pOut)++ =
283 <a name="l00257"></a>00257 __PKHBT((<a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a>) __SSAT(in1 >> 15, 16), (<a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a>) __SSAT(in2 >> 15, 16),
284 <a name="l00258"></a>00258 16);
285 <a name="l00259"></a>00259
286 <a name="l00260"></a>00260 <span class="preprocessor">#else</span>
287 <a name="l00261"></a>00261 <span class="preprocessor"></span>
288 <a name="l00262"></a>00262 *<a class="code" href="arm__math_8h.html#a9de2e0a5785be82866bcb96012282248" title="definition to read/write two 16 bit values.">__SIMD32</a>(pOut)++ =
289 <a name="l00263"></a>00263 __PKHBT((<a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a>) __SSAT(in2 >> 15, 16), (<a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a>) __SSAT(in1 >> 15, 16),
290 <a name="l00264"></a>00264 16);
291 <a name="l00265"></a>00265
292 <a name="l00266"></a>00266 <span class="preprocessor">#endif </span><span class="comment">/* #ifndef ARM_MATH_BIG_ENDIAN */</span>
293 <a name="l00267"></a>00267
294 <a name="l00268"></a>00268
295 <a name="l00269"></a>00269 blkCnt--;
296 <a name="l00270"></a>00270
297 <a name="l00271"></a>00271 }
298 <a name="l00272"></a>00272
299 <a name="l00273"></a>00273 <span class="comment">/* If the blockSize is not a multiple of 4, </span>
300 <a name="l00274"></a>00274 <span class="comment"> remaining samples are processed in the below loop */</span>
301 <a name="l00275"></a>00275 blkCnt = blockSize % 0x4u;
302 <a name="l00276"></a>00276
303 <a name="l00277"></a>00277 <span class="keywordflow">while</span>(blkCnt > 0u)
304 <a name="l00278"></a>00278 {
305 <a name="l00279"></a>00279 *pOut++ = (<a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a>) __SSAT(*pScr2++ >> 15, 16);
306 <a name="l00280"></a>00280 blkCnt--;
307 <a name="l00281"></a>00281 }
308 <a name="l00282"></a>00282
309 <a name="l00283"></a>00283 <span class="preprocessor">#else</span>
310 <a name="l00284"></a>00284 <span class="preprocessor"></span>
311 <a name="l00285"></a>00285 <span class="comment">/* Run the below code for Cortex-M0 */</span>
312 <a name="l00286"></a>00286
313 <a name="l00287"></a>00287 <span class="comment">/* BlockSize of Input samples are copied into the state buffer */</span>
314 <a name="l00288"></a>00288 <span class="comment">/* StateIndex points to the starting position to write in the state buffer */</span>
315 <a name="l00289"></a>00289 <a class="code" href="arm__math_8h.html#a3ba2d215477e692def7fda46dda883ed" title="Q15 Circular write function.">arm_circularWrite_q15</a>(py, delaySize, &S-><a class="code" href="structarm__fir__sparse__instance__q15.html#a89487f28cab52637426024005e478985">stateIndex</a>, 1, pIn, 1, blockSize);
316 <a name="l00290"></a>00290
317 <a name="l00291"></a>00291 <span class="comment">/* Loop over the number of taps. */</span>
318 <a name="l00292"></a>00292 tapCnt = numTaps;
319 <a name="l00293"></a>00293
320 <a name="l00294"></a>00294 <span class="comment">/* Read Index, from where the state buffer should be read, is calculated. */</span>
321 <a name="l00295"></a>00295 readIndex = (S-><a class="code" href="structarm__fir__sparse__instance__q15.html#a89487f28cab52637426024005e478985">stateIndex</a> - <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>) - *pTapDelay++;
322 <a name="l00296"></a>00296
323 <a name="l00297"></a>00297 <span class="comment">/* Wraparound of readIndex */</span>
324 <a name="l00298"></a>00298 <span class="keywordflow">if</span>(readIndex < 0)
325 <a name="l00299"></a>00299 {
326 <a name="l00300"></a>00300 readIndex += (int32_t) delaySize;
327 <a name="l00301"></a>00301 }
328 <a name="l00302"></a>00302
329 <a name="l00303"></a>00303 <span class="comment">/* Working pointer for state buffer is updated */</span>
330 <a name="l00304"></a>00304 py = pState;
331 <a name="l00305"></a>00305
332 <a name="l00306"></a>00306 <span class="comment">/* blockSize samples are read from the state buffer */</span>
333 <a name="l00307"></a>00307 <a class="code" href="arm__math_8h.html#ad5fb134f83f2c802261f172e3dceb131" title="Q15 Circular Read function.">arm_circularRead_q15</a>(py, delaySize, &readIndex, 1,
334 <a name="l00308"></a>00308 pb, pb, blockSize, 1, blockSize);
335 <a name="l00309"></a>00309
336 <a name="l00310"></a>00310 <span class="comment">/* Working pointer for the scratch buffer of state values */</span>
337 <a name="l00311"></a>00311 px = pb;
338 <a name="l00312"></a>00312
339 <a name="l00313"></a>00313 <span class="comment">/* Working pointer for scratch buffer of output values */</span>
340 <a name="l00314"></a>00314 pScratchOut = pScr2;
341 <a name="l00315"></a>00315
342 <a name="l00316"></a>00316 blkCnt = <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>;
343 <a name="l00317"></a>00317
344 <a name="l00318"></a>00318 <span class="keywordflow">while</span>(blkCnt > 0u)
345 <a name="l00319"></a>00319 {
346 <a name="l00320"></a>00320 <span class="comment">/* Perform multiplication and store in the scratch buffer */</span>
347 <a name="l00321"></a>00321 *pScratchOut++ = ((<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) * px++ * coeff);
348 <a name="l00322"></a>00322
349 <a name="l00323"></a>00323 <span class="comment">/* Decrement the loop counter */</span>
350 <a name="l00324"></a>00324 blkCnt--;
351 <a name="l00325"></a>00325 }
352 <a name="l00326"></a>00326
353 <a name="l00327"></a>00327 <span class="comment">/* Load the coefficient value and </span>
354 <a name="l00328"></a>00328 <span class="comment"> * increment the coefficient buffer for the next set of state values */</span>
355 <a name="l00329"></a>00329 coeff = *pCoeffs++;
356 <a name="l00330"></a>00330
357 <a name="l00331"></a>00331 <span class="comment">/* Read Index, from where the state buffer should be read, is calculated. */</span>
358 <a name="l00332"></a>00332 readIndex = (S-><a class="code" href="structarm__fir__sparse__instance__q15.html#a89487f28cab52637426024005e478985">stateIndex</a> - <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>) - *pTapDelay++;
359 <a name="l00333"></a>00333
360 <a name="l00334"></a>00334 <span class="comment">/* Wraparound of readIndex */</span>
361 <a name="l00335"></a>00335 <span class="keywordflow">if</span>(readIndex < 0)
362 <a name="l00336"></a>00336 {
363 <a name="l00337"></a>00337 readIndex += (int32_t) delaySize;
364 <a name="l00338"></a>00338 }
365 <a name="l00339"></a>00339
366 <a name="l00340"></a>00340 <span class="comment">/* Loop over the number of taps. */</span>
367 <a name="l00341"></a>00341 tapCnt = (uint32_t) numTaps - 1u;
368 <a name="l00342"></a>00342
369 <a name="l00343"></a>00343 <span class="keywordflow">while</span>(tapCnt > 0u)
370 <a name="l00344"></a>00344 {
371 <a name="l00345"></a>00345 <span class="comment">/* Working pointer for state buffer is updated */</span>
372 <a name="l00346"></a>00346 py = pState;
373 <a name="l00347"></a>00347
374 <a name="l00348"></a>00348 <span class="comment">/* blockSize samples are read from the state buffer */</span>
375 <a name="l00349"></a>00349 <a class="code" href="arm__math_8h.html#ad5fb134f83f2c802261f172e3dceb131" title="Q15 Circular Read function.">arm_circularRead_q15</a>(py, delaySize, &readIndex, 1,
376 <a name="l00350"></a>00350 pb, pb, blockSize, 1, blockSize);
377 <a name="l00351"></a>00351
378 <a name="l00352"></a>00352 <span class="comment">/* Working pointer for the scratch buffer of state values */</span>
379 <a name="l00353"></a>00353 px = pb;
380 <a name="l00354"></a>00354
381 <a name="l00355"></a>00355 <span class="comment">/* Working pointer for scratch buffer of output values */</span>
382 <a name="l00356"></a>00356 pScratchOut = pScr2;
383 <a name="l00357"></a>00357
384 <a name="l00358"></a>00358 blkCnt = <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>;
385 <a name="l00359"></a>00359
386 <a name="l00360"></a>00360 <span class="keywordflow">while</span>(blkCnt > 0u)
387 <a name="l00361"></a>00361 {
388 <a name="l00362"></a>00362 <span class="comment">/* Perform Multiply-Accumulate */</span>
389 <a name="l00363"></a>00363 *pScratchOut++ += (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) * px++ * coeff;
390 <a name="l00364"></a>00364
391 <a name="l00365"></a>00365 <span class="comment">/* Decrement the loop counter */</span>
392 <a name="l00366"></a>00366 blkCnt--;
393 <a name="l00367"></a>00367 }
394 <a name="l00368"></a>00368
395 <a name="l00369"></a>00369 <span class="comment">/* Load the coefficient value and </span>
396 <a name="l00370"></a>00370 <span class="comment"> * increment the coefficient buffer for the next set of state values */</span>
397 <a name="l00371"></a>00371 coeff = *pCoeffs++;
398 <a name="l00372"></a>00372
399 <a name="l00373"></a>00373 <span class="comment">/* Read Index, from where the state buffer should be read, is calculated. */</span>
400 <a name="l00374"></a>00374 readIndex = (S-><a class="code" href="structarm__fir__sparse__instance__q15.html#a89487f28cab52637426024005e478985">stateIndex</a> - <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>) - *pTapDelay++;
401 <a name="l00375"></a>00375
402 <a name="l00376"></a>00376 <span class="comment">/* Wraparound of readIndex */</span>
403 <a name="l00377"></a>00377 <span class="keywordflow">if</span>(readIndex < 0)
404 <a name="l00378"></a>00378 {
405 <a name="l00379"></a>00379 readIndex += (int32_t) delaySize;
406 <a name="l00380"></a>00380 }
407 <a name="l00381"></a>00381
408 <a name="l00382"></a>00382 <span class="comment">/* Decrement the tap loop counter */</span>
409 <a name="l00383"></a>00383 tapCnt--;
410 <a name="l00384"></a>00384 }
411 <a name="l00385"></a>00385
412 <a name="l00386"></a>00386 <span class="comment">/* All the output values are in pScratchOut buffer. </span>
413 <a name="l00387"></a>00387 <span class="comment"> Convert them into 1.15 format, saturate and store in the destination buffer. */</span>
414 <a name="l00388"></a>00388 <span class="comment">/* Loop over the blockSize. */</span>
415 <a name="l00389"></a>00389 blkCnt = <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>;
416 <a name="l00390"></a>00390
417 <a name="l00391"></a>00391 <span class="keywordflow">while</span>(blkCnt > 0u)
418 <a name="l00392"></a>00392 {
419 <a name="l00393"></a>00393 *pOut++ = (<a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a>) __SSAT(*pScr2++ >> 15, 16);
420 <a name="l00394"></a>00394 blkCnt--;
421 <a name="l00395"></a>00395 }
422 <a name="l00396"></a>00396
423 <a name="l00397"></a>00397 <span class="preprocessor">#endif </span><span class="comment">/* #ifndef ARM_MATH_CM0 */</span>
424 <a name="l00398"></a>00398
425 <a name="l00399"></a>00399 }
426 <a name="l00400"></a>00400
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