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49 <div class="headertitle">
50 <h1>arm_fir_sparse_q31.c</h1> </div>
52 <div class="contents">
53 <a href="arm__fir__sparse__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>
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_q31.c </span>
61 <a name="l00009"></a>00009 <span class="comment">* </span>
62 <a name="l00010"></a>00010 <span class="comment">* Description: Q31 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="l00034"></a>00034
87 <a name="l00058"></a><a class="code" href="group___f_i_r___sparse.html#ga03e9c2f0f35ad67d20bac66be9f920ec">00058</a> <span class="keywordtype">void</span> <a class="code" href="group___f_i_r___sparse.html#ga03e9c2f0f35ad67d20bac66be9f920ec" title="Processing function for the Q31 sparse FIR filter.">arm_fir_sparse_q31</a>(
88 <a name="l00059"></a>00059 <a class="code" href="structarm__fir__sparse__instance__q31.html" title="Instance structure for the Q31 sparse FIR filter.">arm_fir_sparse_instance_q31</a> * S,
89 <a name="l00060"></a>00060 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> * pSrc,
90 <a name="l00061"></a>00061 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> * pDst,
91 <a name="l00062"></a>00062 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> * pScratchIn,
92 <a name="l00063"></a>00063 uint32_t <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>)
93 <a name="l00064"></a>00064 {
94 <a name="l00065"></a>00065
95 <a name="l00066"></a>00066 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> *pState = S-><a class="code" href="structarm__fir__sparse__instance__q31.html#a830be89daa5a393b225048889aa045d1">pState</a>; <span class="comment">/* State pointer */</span>
96 <a name="l00067"></a>00067 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> *pCoeffs = S-><a class="code" href="structarm__fir__sparse__instance__q31.html#a093d6227f0d1597982cd083fb126f4e0">pCoeffs</a>; <span class="comment">/* Coefficient pointer */</span>
97 <a name="l00068"></a>00068 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> *px; <span class="comment">/* Scratch buffer pointer */</span>
98 <a name="l00069"></a>00069 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> *py = pState; <span class="comment">/* Temporary pointers for state buffer */</span>
99 <a name="l00070"></a>00070 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> *pb = pScratchIn; <span class="comment">/* Temporary pointers for scratch buffer */</span>
100 <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> *pOut; <span class="comment">/* Destination pointer */</span>
101 <a name="l00072"></a>00072 <a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a> out; <span class="comment">/* Temporary output variable */</span>
102 <a name="l00073"></a>00073 int32_t *pTapDelay = S-><a class="code" href="structarm__fir__sparse__instance__q31.html#ab87ae457adec8f727afefaa2599fc983">pTapDelay</a>; <span class="comment">/* Pointer to the array containing offset of the non-zero tap values. */</span>
103 <a name="l00074"></a>00074 uint32_t delaySize = S-><a class="code" href="structarm__fir__sparse__instance__q31.html#afdd3a1dc72132c854dc379154b68b674">maxDelay</a> + <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>; <span class="comment">/* state length */</span>
104 <a name="l00075"></a>00075 uint16_t numTaps = S-><a class="code" href="structarm__fir__sparse__instance__q31.html#a07b6c01e58ec6dde384719130d36b0dc">numTaps</a>; <span class="comment">/* Filter order */</span>
105 <a name="l00076"></a>00076 int32_t readIndex; <span class="comment">/* Read index of the state buffer */</span>
106 <a name="l00077"></a>00077 uint32_t tapCnt, blkCnt; <span class="comment">/* loop counters */</span>
107 <a name="l00078"></a>00078 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> coeff = *pCoeffs++; <span class="comment">/* Read the first coefficient value */</span>
108 <a name="l00079"></a>00079 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> in;
109 <a name="l00080"></a>00080
110 <a name="l00081"></a>00081
111 <a name="l00082"></a>00082 <span class="comment">/* BlockSize of Input samples are copied into the state buffer */</span>
112 <a name="l00083"></a>00083 <span class="comment">/* StateIndex points to the starting position to write in the state buffer */</span>
113 <a name="l00084"></a>00084 <a class="code" href="arm__math_8h.html#a6ff56c0896ce00712ba8f2fcf72cacd3" title="floating-point Circular write function.">arm_circularWrite_f32</a>((int32_t *) py, delaySize, &S-><a class="code" href="structarm__fir__sparse__instance__q31.html#a557ed9d477e76e4ad2019344f19f568a">stateIndex</a>, 1,
114 <a name="l00085"></a>00085 (int32_t *) pSrc, 1, blockSize);
115 <a name="l00086"></a>00086
116 <a name="l00087"></a>00087 <span class="comment">/* Read Index, from where the state buffer should be read, is calculated. */</span>
117 <a name="l00088"></a>00088 readIndex = (int32_t) (S-><a class="code" href="structarm__fir__sparse__instance__q31.html#a557ed9d477e76e4ad2019344f19f568a">stateIndex</a> - blockSize) - *pTapDelay++;
118 <a name="l00089"></a>00089
119 <a name="l00090"></a>00090 <span class="comment">/* Wraparound of readIndex */</span>
120 <a name="l00091"></a>00091 <span class="keywordflow">if</span>(readIndex < 0)
121 <a name="l00092"></a>00092 {
122 <a name="l00093"></a>00093 readIndex += (int32_t) delaySize;
123 <a name="l00094"></a>00094 }
124 <a name="l00095"></a>00095
125 <a name="l00096"></a>00096 <span class="comment">/* Working pointer for state buffer is updated */</span>
126 <a name="l00097"></a>00097 py = pState;
127 <a name="l00098"></a>00098
128 <a name="l00099"></a>00099 <span class="comment">/* blockSize samples are read from the state buffer */</span>
129 <a name="l00100"></a>00100 <a class="code" href="arm__math_8h.html#ae469fac5e1df35f8bcf1b3d7c3136484" title="floating-point Circular Read function.">arm_circularRead_f32</a>((int32_t *) py, delaySize, &readIndex, 1,
130 <a name="l00101"></a>00101 (int32_t *) pb, (int32_t *) pb, blockSize, 1,
131 <a name="l00102"></a>00102 blockSize);
132 <a name="l00103"></a>00103
133 <a name="l00104"></a>00104 <span class="comment">/* Working pointer for the scratch buffer of state values */</span>
134 <a name="l00105"></a>00105 px = pb;
135 <a name="l00106"></a>00106
136 <a name="l00107"></a>00107 <span class="comment">/* Working pointer for scratch buffer of output values */</span>
137 <a name="l00108"></a>00108 pOut = pDst;
138 <a name="l00109"></a>00109
139 <a name="l00110"></a>00110
140 <a name="l00111"></a>00111 <span class="preprocessor">#ifndef ARM_MATH_CM0</span>
141 <a name="l00112"></a>00112 <span class="preprocessor"></span>
142 <a name="l00113"></a>00113 <span class="comment">/* Run the below code for Cortex-M4 and Cortex-M3 */</span>
143 <a name="l00114"></a>00114
144 <a name="l00115"></a>00115 <span class="comment">/* Loop over the blockSize. Unroll by a factor of 4. </span>
145 <a name="l00116"></a>00116 <span class="comment"> * Compute 4 Multiplications at a time. */</span>
146 <a name="l00117"></a>00117 blkCnt = blockSize >> 2;
147 <a name="l00118"></a>00118
148 <a name="l00119"></a>00119 <span class="keywordflow">while</span>(blkCnt > 0u)
149 <a name="l00120"></a>00120 {
150 <a name="l00121"></a>00121 <span class="comment">/* Perform Multiplications and store in the destination buffer */</span>
151 <a name="l00122"></a>00122 *pOut++ = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) (((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) * px++ * coeff) >> 32);
152 <a name="l00123"></a>00123 *pOut++ = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) (((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) * px++ * coeff) >> 32);
153 <a name="l00124"></a>00124 *pOut++ = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) (((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) * px++ * coeff) >> 32);
154 <a name="l00125"></a>00125 *pOut++ = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) (((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) * px++ * coeff) >> 32);
155 <a name="l00126"></a>00126
156 <a name="l00127"></a>00127 <span class="comment">/* Decrement the loop counter */</span>
157 <a name="l00128"></a>00128 blkCnt--;
158 <a name="l00129"></a>00129 }
159 <a name="l00130"></a>00130
160 <a name="l00131"></a>00131 <span class="comment">/* If the blockSize is not a multiple of 4, </span>
161 <a name="l00132"></a>00132 <span class="comment"> * compute the remaining samples */</span>
162 <a name="l00133"></a>00133 blkCnt = blockSize % 0x4u;
163 <a name="l00134"></a>00134
164 <a name="l00135"></a>00135 <span class="keywordflow">while</span>(blkCnt > 0u)
165 <a name="l00136"></a>00136 {
166 <a name="l00137"></a>00137 <span class="comment">/* Perform Multiplications and store in the destination buffer */</span>
167 <a name="l00138"></a>00138 *pOut++ = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) (((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) * px++ * coeff) >> 32);
168 <a name="l00139"></a>00139
169 <a name="l00140"></a>00140 <span class="comment">/* Decrement the loop counter */</span>
170 <a name="l00141"></a>00141 blkCnt--;
171 <a name="l00142"></a>00142 }
172 <a name="l00143"></a>00143
173 <a name="l00144"></a>00144 <span class="comment">/* Load the coefficient value and </span>
174 <a name="l00145"></a>00145 <span class="comment"> * increment the coefficient buffer for the next set of state values */</span>
175 <a name="l00146"></a>00146 coeff = *pCoeffs++;
176 <a name="l00147"></a>00147
177 <a name="l00148"></a>00148 <span class="comment">/* Read Index, from where the state buffer should be read, is calculated. */</span>
178 <a name="l00149"></a>00149 readIndex = (int32_t) (S-><a class="code" href="structarm__fir__sparse__instance__q31.html#a557ed9d477e76e4ad2019344f19f568a">stateIndex</a> - blockSize) - *pTapDelay++;
179 <a name="l00150"></a>00150
180 <a name="l00151"></a>00151 <span class="comment">/* Wraparound of readIndex */</span>
181 <a name="l00152"></a>00152 <span class="keywordflow">if</span>(readIndex < 0)
182 <a name="l00153"></a>00153 {
183 <a name="l00154"></a>00154 readIndex += (int32_t) delaySize;
184 <a name="l00155"></a>00155 }
185 <a name="l00156"></a>00156
186 <a name="l00157"></a>00157 <span class="comment">/* Loop over the number of taps. */</span>
187 <a name="l00158"></a>00158 tapCnt = (uint32_t) numTaps - 1u;
188 <a name="l00159"></a>00159
189 <a name="l00160"></a>00160 <span class="keywordflow">while</span>(tapCnt > 0u)
190 <a name="l00161"></a>00161 {
191 <a name="l00162"></a>00162 <span class="comment">/* Working pointer for state buffer is updated */</span>
192 <a name="l00163"></a>00163 py = pState;
193 <a name="l00164"></a>00164
194 <a name="l00165"></a>00165 <span class="comment">/* blockSize samples are read from the state buffer */</span>
195 <a name="l00166"></a>00166 <a class="code" href="arm__math_8h.html#ae469fac5e1df35f8bcf1b3d7c3136484" title="floating-point Circular Read function.">arm_circularRead_f32</a>((int32_t *) py, delaySize, &readIndex, 1,
196 <a name="l00167"></a>00167 (int32_t *) pb, (int32_t *) pb, blockSize, 1,
197 <a name="l00168"></a>00168 blockSize);
198 <a name="l00169"></a>00169
199 <a name="l00170"></a>00170 <span class="comment">/* Working pointer for the scratch buffer of state values */</span>
200 <a name="l00171"></a>00171 px = pb;
201 <a name="l00172"></a>00172
202 <a name="l00173"></a>00173 <span class="comment">/* Working pointer for scratch buffer of output values */</span>
203 <a name="l00174"></a>00174 pOut = pDst;
204 <a name="l00175"></a>00175
205 <a name="l00176"></a>00176 <span class="comment">/* Loop over the blockSize. Unroll by a factor of 4. </span>
206 <a name="l00177"></a>00177 <span class="comment"> * Compute 4 MACS at a time. */</span>
207 <a name="l00178"></a>00178 blkCnt = blockSize >> 2;
208 <a name="l00179"></a>00179
209 <a name="l00180"></a>00180 <span class="keywordflow">while</span>(blkCnt > 0u)
210 <a name="l00181"></a>00181 {
211 <a name="l00182"></a>00182 out = *pOut;
212 <a name="l00183"></a>00183 out += ((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) * px++ * coeff) >> 32;
213 <a name="l00184"></a>00184 *pOut++ = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) (out);
214 <a name="l00185"></a>00185
215 <a name="l00186"></a>00186 out = *pOut;
216 <a name="l00187"></a>00187 out += ((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) * px++ * coeff) >> 32;
217 <a name="l00188"></a>00188 *pOut++ = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) (out);
218 <a name="l00189"></a>00189
219 <a name="l00190"></a>00190 out = *pOut;
220 <a name="l00191"></a>00191 out += ((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) * px++ * coeff) >> 32;
221 <a name="l00192"></a>00192 *pOut++ = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) (out);
222 <a name="l00193"></a>00193
223 <a name="l00194"></a>00194 out = *pOut;
224 <a name="l00195"></a>00195 out += ((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) * px++ * coeff) >> 32;
225 <a name="l00196"></a>00196 *pOut++ = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) (out);
226 <a name="l00197"></a>00197
227 <a name="l00198"></a>00198 <span class="comment">/* Decrement the loop counter */</span>
228 <a name="l00199"></a>00199 blkCnt--;
229 <a name="l00200"></a>00200 }
230 <a name="l00201"></a>00201
231 <a name="l00202"></a>00202 <span class="comment">/* If the blockSize is not a multiple of 4, </span>
232 <a name="l00203"></a>00203 <span class="comment"> * compute the remaining samples */</span>
233 <a name="l00204"></a>00204 blkCnt = blockSize % 0x4u;
234 <a name="l00205"></a>00205
235 <a name="l00206"></a>00206 <span class="keywordflow">while</span>(blkCnt > 0u)
236 <a name="l00207"></a>00207 {
237 <a name="l00208"></a>00208 <span class="comment">/* Perform Multiply-Accumulate */</span>
238 <a name="l00209"></a>00209 out = *pOut;
239 <a name="l00210"></a>00210 out += ((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) * px++ * coeff) >> 32;
240 <a name="l00211"></a>00211 *pOut++ = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) (out);
241 <a name="l00212"></a>00212
242 <a name="l00213"></a>00213 <span class="comment">/* Decrement the loop counter */</span>
243 <a name="l00214"></a>00214 blkCnt--;
244 <a name="l00215"></a>00215 }
245 <a name="l00216"></a>00216
246 <a name="l00217"></a>00217 <span class="comment">/* Load the coefficient value and </span>
247 <a name="l00218"></a>00218 <span class="comment"> * increment the coefficient buffer for the next set of state values */</span>
248 <a name="l00219"></a>00219 coeff = *pCoeffs++;
249 <a name="l00220"></a>00220
250 <a name="l00221"></a>00221 <span class="comment">/* Read Index, from where the state buffer should be read, is calculated. */</span>
251 <a name="l00222"></a>00222 readIndex = (int32_t) (S-><a class="code" href="structarm__fir__sparse__instance__q31.html#a557ed9d477e76e4ad2019344f19f568a">stateIndex</a> - blockSize) - *pTapDelay++;
252 <a name="l00223"></a>00223
253 <a name="l00224"></a>00224 <span class="comment">/* Wraparound of readIndex */</span>
254 <a name="l00225"></a>00225 <span class="keywordflow">if</span>(readIndex < 0)
255 <a name="l00226"></a>00226 {
256 <a name="l00227"></a>00227 readIndex += (int32_t) delaySize;
257 <a name="l00228"></a>00228 }
258 <a name="l00229"></a>00229
259 <a name="l00230"></a>00230 <span class="comment">/* Decrement the tap loop counter */</span>
260 <a name="l00231"></a>00231 tapCnt--;
261 <a name="l00232"></a>00232 }
262 <a name="l00233"></a>00233
263 <a name="l00234"></a>00234 <span class="comment">/* Working output pointer is updated */</span>
264 <a name="l00235"></a>00235 pOut = pDst;
265 <a name="l00236"></a>00236
266 <a name="l00237"></a>00237 <span class="comment">/* Output is converted into 1.31 format. */</span>
267 <a name="l00238"></a>00238 <span class="comment">/* Loop over the blockSize. Unroll by a factor of 4. </span>
268 <a name="l00239"></a>00239 <span class="comment"> * process 4 output samples at a time. */</span>
269 <a name="l00240"></a>00240 blkCnt = blockSize >> 2;
270 <a name="l00241"></a>00241
271 <a name="l00242"></a>00242 <span class="keywordflow">while</span>(blkCnt > 0u)
272 <a name="l00243"></a>00243 {
273 <a name="l00244"></a>00244 in = *pOut << 1;
274 <a name="l00245"></a>00245 *pOut++ = in;
275 <a name="l00246"></a>00246 in = *pOut << 1;
276 <a name="l00247"></a>00247 *pOut++ = in;
277 <a name="l00248"></a>00248 in = *pOut << 1;
278 <a name="l00249"></a>00249 *pOut++ = in;
279 <a name="l00250"></a>00250 in = *pOut << 1;
280 <a name="l00251"></a>00251 *pOut++ = in;
281 <a name="l00252"></a>00252
282 <a name="l00253"></a>00253 <span class="comment">/* Decrement the loop counter */</span>
283 <a name="l00254"></a>00254 blkCnt--;
284 <a name="l00255"></a>00255 }
285 <a name="l00256"></a>00256
286 <a name="l00257"></a>00257 <span class="comment">/* If the blockSize is not a multiple of 4, </span>
287 <a name="l00258"></a>00258 <span class="comment"> * process the remaining output samples */</span>
288 <a name="l00259"></a>00259 blkCnt = blockSize % 0x4u;
289 <a name="l00260"></a>00260
290 <a name="l00261"></a>00261 <span class="keywordflow">while</span>(blkCnt > 0u)
291 <a name="l00262"></a>00262 {
292 <a name="l00263"></a>00263 in = *pOut << 1;
293 <a name="l00264"></a>00264 *pOut++ = in;
294 <a name="l00265"></a>00265
295 <a name="l00266"></a>00266 <span class="comment">/* Decrement the loop counter */</span>
296 <a name="l00267"></a>00267 blkCnt--;
297 <a name="l00268"></a>00268 }
298 <a name="l00269"></a>00269
299 <a name="l00270"></a>00270 <span class="preprocessor">#else</span>
300 <a name="l00271"></a>00271 <span class="preprocessor"></span>
301 <a name="l00272"></a>00272 <span class="comment">/* Run the below code for Cortex-M0 */</span>
302 <a name="l00273"></a>00273 blkCnt = <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>;
303 <a name="l00274"></a>00274
304 <a name="l00275"></a>00275 <span class="keywordflow">while</span>(blkCnt > 0u)
305 <a name="l00276"></a>00276 {
306 <a name="l00277"></a>00277 <span class="comment">/* Perform Multiplications and store in the destination buffer */</span>
307 <a name="l00278"></a>00278 *pOut++ = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) (((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) * px++ * coeff) >> 32);
308 <a name="l00279"></a>00279
309 <a name="l00280"></a>00280 <span class="comment">/* Decrement the loop counter */</span>
310 <a name="l00281"></a>00281 blkCnt--;
311 <a name="l00282"></a>00282 }
312 <a name="l00283"></a>00283
313 <a name="l00284"></a>00284 <span class="comment">/* Load the coefficient value and </span>
314 <a name="l00285"></a>00285 <span class="comment"> * increment the coefficient buffer for the next set of state values */</span>
315 <a name="l00286"></a>00286 coeff = *pCoeffs++;
316 <a name="l00287"></a>00287
317 <a name="l00288"></a>00288 <span class="comment">/* Read Index, from where the state buffer should be read, is calculated. */</span>
318 <a name="l00289"></a>00289 readIndex = (int32_t) (S-><a class="code" href="structarm__fir__sparse__instance__q31.html#a557ed9d477e76e4ad2019344f19f568a">stateIndex</a> - blockSize) - *pTapDelay++;
319 <a name="l00290"></a>00290
320 <a name="l00291"></a>00291 <span class="comment">/* Wraparound of readIndex */</span>
321 <a name="l00292"></a>00292 <span class="keywordflow">if</span>(readIndex < 0)
322 <a name="l00293"></a>00293 {
323 <a name="l00294"></a>00294 readIndex += (int32_t) delaySize;
324 <a name="l00295"></a>00295 }
325 <a name="l00296"></a>00296
326 <a name="l00297"></a>00297 <span class="comment">/* Loop over the number of taps. */</span>
327 <a name="l00298"></a>00298 tapCnt = (uint32_t) numTaps - 1u;
328 <a name="l00299"></a>00299
329 <a name="l00300"></a>00300 <span class="keywordflow">while</span>(tapCnt > 0u)
330 <a name="l00301"></a>00301 {
331 <a name="l00302"></a>00302 <span class="comment">/* Working pointer for state buffer is updated */</span>
332 <a name="l00303"></a>00303 py = pState;
333 <a name="l00304"></a>00304
334 <a name="l00305"></a>00305 <span class="comment">/* blockSize samples are read from the state buffer */</span>
335 <a name="l00306"></a>00306 <a class="code" href="arm__math_8h.html#ae469fac5e1df35f8bcf1b3d7c3136484" title="floating-point Circular Read function.">arm_circularRead_f32</a>((int32_t *) py, delaySize, &readIndex, 1,
336 <a name="l00307"></a>00307 (int32_t *) pb, (int32_t *) pb, blockSize, 1,
337 <a name="l00308"></a>00308 blockSize);
338 <a name="l00309"></a>00309
339 <a name="l00310"></a>00310 <span class="comment">/* Working pointer for the scratch buffer of state values */</span>
340 <a name="l00311"></a>00311 px = pb;
341 <a name="l00312"></a>00312
342 <a name="l00313"></a>00313 <span class="comment">/* Working pointer for scratch buffer of output values */</span>
343 <a name="l00314"></a>00314 pOut = pDst;
344 <a name="l00315"></a>00315
345 <a name="l00316"></a>00316 blkCnt = <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>;
346 <a name="l00317"></a>00317
347 <a name="l00318"></a>00318 <span class="keywordflow">while</span>(blkCnt > 0u)
348 <a name="l00319"></a>00319 {
349 <a name="l00320"></a>00320 <span class="comment">/* Perform Multiply-Accumulate */</span>
350 <a name="l00321"></a>00321 out = *pOut;
351 <a name="l00322"></a>00322 out += ((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) * px++ * coeff) >> 32;
352 <a name="l00323"></a>00323 *pOut++ = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) (out);
353 <a name="l00324"></a>00324
354 <a name="l00325"></a>00325 <span class="comment">/* Decrement the loop counter */</span>
355 <a name="l00326"></a>00326 blkCnt--;
356 <a name="l00327"></a>00327 }
357 <a name="l00328"></a>00328
358 <a name="l00329"></a>00329 <span class="comment">/* Load the coefficient value and </span>
359 <a name="l00330"></a>00330 <span class="comment"> * increment the coefficient buffer for the next set of state values */</span>
360 <a name="l00331"></a>00331 coeff = *pCoeffs++;
361 <a name="l00332"></a>00332
362 <a name="l00333"></a>00333 <span class="comment">/* Read Index, from where the state buffer should be read, is calculated. */</span>
363 <a name="l00334"></a>00334 readIndex = (int32_t) (S-><a class="code" href="structarm__fir__sparse__instance__q31.html#a557ed9d477e76e4ad2019344f19f568a">stateIndex</a> - blockSize) - *pTapDelay++;
364 <a name="l00335"></a>00335
365 <a name="l00336"></a>00336 <span class="comment">/* Wraparound of readIndex */</span>
366 <a name="l00337"></a>00337 <span class="keywordflow">if</span>(readIndex < 0)
367 <a name="l00338"></a>00338 {
368 <a name="l00339"></a>00339 readIndex += (int32_t) delaySize;
369 <a name="l00340"></a>00340 }
370 <a name="l00341"></a>00341
371 <a name="l00342"></a>00342 <span class="comment">/* Decrement the tap loop counter */</span>
372 <a name="l00343"></a>00343 tapCnt--;
373 <a name="l00344"></a>00344 }
374 <a name="l00345"></a>00345
375 <a name="l00346"></a>00346 <span class="comment">/* Working output pointer is updated */</span>
376 <a name="l00347"></a>00347 pOut = pDst;
377 <a name="l00348"></a>00348
378 <a name="l00349"></a>00349 <span class="comment">/* Output is converted into 1.31 format. */</span>
379 <a name="l00350"></a>00350 blkCnt = <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>;
380 <a name="l00351"></a>00351
381 <a name="l00352"></a>00352 <span class="keywordflow">while</span>(blkCnt > 0u)
382 <a name="l00353"></a>00353 {
383 <a name="l00354"></a>00354 in = *pOut << 1;
384 <a name="l00355"></a>00355 *pOut++ = in;
385 <a name="l00356"></a>00356
386 <a name="l00357"></a>00357 <span class="comment">/* Decrement the loop counter */</span>
387 <a name="l00358"></a>00358 blkCnt--;
388 <a name="l00359"></a>00359 }
389 <a name="l00360"></a>00360
390 <a name="l00361"></a>00361 <span class="preprocessor">#endif </span><span class="comment">/* #ifndef ARM_MATH_CM0 */</span>
391 <a name="l00362"></a>00362
392 <a name="l00363"></a>00363 }
393 <a name="l00364"></a>00364
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