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functions/FilteringFunctions/arm_fir_lattice_q15.c@3:4098b9d3d571, 2018-06-21 (annotated)
- Committer:
- xorjoep
- Date:
- Thu Jun 21 11:56:27 2018 +0000
- Revision:
- 3:4098b9d3d571
- Parent:
- 1:24714b45cd1b
headers is a folder not a library
Who changed what in which revision?
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xorjoep | 1:24714b45cd1b | 1 | /* ---------------------------------------------------------------------- |
xorjoep | 1:24714b45cd1b | 2 | * Project: CMSIS DSP Library |
xorjoep | 1:24714b45cd1b | 3 | * Title: arm_fir_lattice_q15.c |
xorjoep | 1:24714b45cd1b | 4 | * Description: Q15 FIR lattice filter processing function |
xorjoep | 1:24714b45cd1b | 5 | * |
xorjoep | 1:24714b45cd1b | 6 | * $Date: 27. January 2017 |
xorjoep | 1:24714b45cd1b | 7 | * $Revision: V.1.5.1 |
xorjoep | 1:24714b45cd1b | 8 | * |
xorjoep | 1:24714b45cd1b | 9 | * Target Processor: Cortex-M cores |
xorjoep | 1:24714b45cd1b | 10 | * -------------------------------------------------------------------- */ |
xorjoep | 1:24714b45cd1b | 11 | /* |
xorjoep | 1:24714b45cd1b | 12 | * Copyright (C) 2010-2017 ARM Limited or its affiliates. All rights reserved. |
xorjoep | 1:24714b45cd1b | 13 | * |
xorjoep | 1:24714b45cd1b | 14 | * SPDX-License-Identifier: Apache-2.0 |
xorjoep | 1:24714b45cd1b | 15 | * |
xorjoep | 1:24714b45cd1b | 16 | * Licensed under the Apache License, Version 2.0 (the License); you may |
xorjoep | 1:24714b45cd1b | 17 | * not use this file except in compliance with the License. |
xorjoep | 1:24714b45cd1b | 18 | * You may obtain a copy of the License at |
xorjoep | 1:24714b45cd1b | 19 | * |
xorjoep | 1:24714b45cd1b | 20 | * www.apache.org/licenses/LICENSE-2.0 |
xorjoep | 1:24714b45cd1b | 21 | * |
xorjoep | 1:24714b45cd1b | 22 | * Unless required by applicable law or agreed to in writing, software |
xorjoep | 1:24714b45cd1b | 23 | * distributed under the License is distributed on an AS IS BASIS, WITHOUT |
xorjoep | 1:24714b45cd1b | 24 | * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
xorjoep | 1:24714b45cd1b | 25 | * See the License for the specific language governing permissions and |
xorjoep | 1:24714b45cd1b | 26 | * limitations under the License. |
xorjoep | 1:24714b45cd1b | 27 | */ |
xorjoep | 1:24714b45cd1b | 28 | |
xorjoep | 1:24714b45cd1b | 29 | #include "arm_math.h" |
xorjoep | 1:24714b45cd1b | 30 | |
xorjoep | 1:24714b45cd1b | 31 | /** |
xorjoep | 1:24714b45cd1b | 32 | * @ingroup groupFilters |
xorjoep | 1:24714b45cd1b | 33 | */ |
xorjoep | 1:24714b45cd1b | 34 | |
xorjoep | 1:24714b45cd1b | 35 | /** |
xorjoep | 1:24714b45cd1b | 36 | * @addtogroup FIR_Lattice |
xorjoep | 1:24714b45cd1b | 37 | * @{ |
xorjoep | 1:24714b45cd1b | 38 | */ |
xorjoep | 1:24714b45cd1b | 39 | |
xorjoep | 1:24714b45cd1b | 40 | |
xorjoep | 1:24714b45cd1b | 41 | /** |
xorjoep | 1:24714b45cd1b | 42 | * @brief Processing function for the Q15 FIR lattice filter. |
xorjoep | 1:24714b45cd1b | 43 | * @param[in] *S points to an instance of the Q15 FIR lattice structure. |
xorjoep | 1:24714b45cd1b | 44 | * @param[in] *pSrc points to the block of input data. |
xorjoep | 1:24714b45cd1b | 45 | * @param[out] *pDst points to the block of output data |
xorjoep | 1:24714b45cd1b | 46 | * @param[in] blockSize number of samples to process. |
xorjoep | 1:24714b45cd1b | 47 | * @return none. |
xorjoep | 1:24714b45cd1b | 48 | */ |
xorjoep | 1:24714b45cd1b | 49 | |
xorjoep | 1:24714b45cd1b | 50 | void arm_fir_lattice_q15( |
xorjoep | 1:24714b45cd1b | 51 | const arm_fir_lattice_instance_q15 * S, |
xorjoep | 1:24714b45cd1b | 52 | q15_t * pSrc, |
xorjoep | 1:24714b45cd1b | 53 | q15_t * pDst, |
xorjoep | 1:24714b45cd1b | 54 | uint32_t blockSize) |
xorjoep | 1:24714b45cd1b | 55 | { |
xorjoep | 1:24714b45cd1b | 56 | q15_t *pState; /* State pointer */ |
xorjoep | 1:24714b45cd1b | 57 | q15_t *pCoeffs = S->pCoeffs; /* Coefficient pointer */ |
xorjoep | 1:24714b45cd1b | 58 | q15_t *px; /* temporary state pointer */ |
xorjoep | 1:24714b45cd1b | 59 | q15_t *pk; /* temporary coefficient pointer */ |
xorjoep | 1:24714b45cd1b | 60 | |
xorjoep | 1:24714b45cd1b | 61 | |
xorjoep | 1:24714b45cd1b | 62 | #if defined (ARM_MATH_DSP) |
xorjoep | 1:24714b45cd1b | 63 | |
xorjoep | 1:24714b45cd1b | 64 | /* Run the below code for Cortex-M4 and Cortex-M3 */ |
xorjoep | 1:24714b45cd1b | 65 | |
xorjoep | 1:24714b45cd1b | 66 | q31_t fcurnt1, fnext1, gcurnt1 = 0, gnext1; /* temporary variables for first sample in loop unrolling */ |
xorjoep | 1:24714b45cd1b | 67 | q31_t fcurnt2, fnext2, gnext2; /* temporary variables for second sample in loop unrolling */ |
xorjoep | 1:24714b45cd1b | 68 | q31_t fcurnt3, fnext3, gnext3; /* temporary variables for third sample in loop unrolling */ |
xorjoep | 1:24714b45cd1b | 69 | q31_t fcurnt4, fnext4, gnext4; /* temporary variables for fourth sample in loop unrolling */ |
xorjoep | 1:24714b45cd1b | 70 | uint32_t numStages = S->numStages; /* Number of stages in the filter */ |
xorjoep | 1:24714b45cd1b | 71 | uint32_t blkCnt, stageCnt; /* temporary variables for counts */ |
xorjoep | 1:24714b45cd1b | 72 | |
xorjoep | 1:24714b45cd1b | 73 | pState = &S->pState[0]; |
xorjoep | 1:24714b45cd1b | 74 | |
xorjoep | 1:24714b45cd1b | 75 | blkCnt = blockSize >> 2U; |
xorjoep | 1:24714b45cd1b | 76 | |
xorjoep | 1:24714b45cd1b | 77 | /* First part of the processing with loop unrolling. Compute 4 outputs at a time. |
xorjoep | 1:24714b45cd1b | 78 | ** a second loop below computes the remaining 1 to 3 samples. */ |
xorjoep | 1:24714b45cd1b | 79 | while (blkCnt > 0U) |
xorjoep | 1:24714b45cd1b | 80 | { |
xorjoep | 1:24714b45cd1b | 81 | |
xorjoep | 1:24714b45cd1b | 82 | /* Read two samples from input buffer */ |
xorjoep | 1:24714b45cd1b | 83 | /* f0(n) = x(n) */ |
xorjoep | 1:24714b45cd1b | 84 | fcurnt1 = *pSrc++; |
xorjoep | 1:24714b45cd1b | 85 | fcurnt2 = *pSrc++; |
xorjoep | 1:24714b45cd1b | 86 | |
xorjoep | 1:24714b45cd1b | 87 | /* Initialize coeff pointer */ |
xorjoep | 1:24714b45cd1b | 88 | pk = (pCoeffs); |
xorjoep | 1:24714b45cd1b | 89 | |
xorjoep | 1:24714b45cd1b | 90 | /* Initialize state pointer */ |
xorjoep | 1:24714b45cd1b | 91 | px = pState; |
xorjoep | 1:24714b45cd1b | 92 | |
xorjoep | 1:24714b45cd1b | 93 | /* Read g0(n-1) from state */ |
xorjoep | 1:24714b45cd1b | 94 | gcurnt1 = *px; |
xorjoep | 1:24714b45cd1b | 95 | |
xorjoep | 1:24714b45cd1b | 96 | /* Process first sample for first tap */ |
xorjoep | 1:24714b45cd1b | 97 | /* f1(n) = f0(n) + K1 * g0(n-1) */ |
xorjoep | 1:24714b45cd1b | 98 | fnext1 = (q31_t) ((gcurnt1 * (*pk)) >> 15U) + fcurnt1; |
xorjoep | 1:24714b45cd1b | 99 | fnext1 = __SSAT(fnext1, 16); |
xorjoep | 1:24714b45cd1b | 100 | |
xorjoep | 1:24714b45cd1b | 101 | /* g1(n) = f0(n) * K1 + g0(n-1) */ |
xorjoep | 1:24714b45cd1b | 102 | gnext1 = (q31_t) ((fcurnt1 * (*pk)) >> 15U) + gcurnt1; |
xorjoep | 1:24714b45cd1b | 103 | gnext1 = __SSAT(gnext1, 16); |
xorjoep | 1:24714b45cd1b | 104 | |
xorjoep | 1:24714b45cd1b | 105 | /* Process second sample for first tap */ |
xorjoep | 1:24714b45cd1b | 106 | /* for sample 2 processing */ |
xorjoep | 1:24714b45cd1b | 107 | fnext2 = (q31_t) ((fcurnt1 * (*pk)) >> 15U) + fcurnt2; |
xorjoep | 1:24714b45cd1b | 108 | fnext2 = __SSAT(fnext2, 16); |
xorjoep | 1:24714b45cd1b | 109 | |
xorjoep | 1:24714b45cd1b | 110 | gnext2 = (q31_t) ((fcurnt2 * (*pk)) >> 15U) + fcurnt1; |
xorjoep | 1:24714b45cd1b | 111 | gnext2 = __SSAT(gnext2, 16); |
xorjoep | 1:24714b45cd1b | 112 | |
xorjoep | 1:24714b45cd1b | 113 | |
xorjoep | 1:24714b45cd1b | 114 | /* Read next two samples from input buffer */ |
xorjoep | 1:24714b45cd1b | 115 | /* f0(n+2) = x(n+2) */ |
xorjoep | 1:24714b45cd1b | 116 | fcurnt3 = *pSrc++; |
xorjoep | 1:24714b45cd1b | 117 | fcurnt4 = *pSrc++; |
xorjoep | 1:24714b45cd1b | 118 | |
xorjoep | 1:24714b45cd1b | 119 | /* Copy only last input samples into the state buffer |
xorjoep | 1:24714b45cd1b | 120 | which is used for next four samples processing */ |
xorjoep | 1:24714b45cd1b | 121 | *px++ = (q15_t) fcurnt4; |
xorjoep | 1:24714b45cd1b | 122 | |
xorjoep | 1:24714b45cd1b | 123 | /* Process third sample for first tap */ |
xorjoep | 1:24714b45cd1b | 124 | fnext3 = (q31_t) ((fcurnt2 * (*pk)) >> 15U) + fcurnt3; |
xorjoep | 1:24714b45cd1b | 125 | fnext3 = __SSAT(fnext3, 16); |
xorjoep | 1:24714b45cd1b | 126 | gnext3 = (q31_t) ((fcurnt3 * (*pk)) >> 15U) + fcurnt2; |
xorjoep | 1:24714b45cd1b | 127 | gnext3 = __SSAT(gnext3, 16); |
xorjoep | 1:24714b45cd1b | 128 | |
xorjoep | 1:24714b45cd1b | 129 | /* Process fourth sample for first tap */ |
xorjoep | 1:24714b45cd1b | 130 | fnext4 = (q31_t) ((fcurnt3 * (*pk)) >> 15U) + fcurnt4; |
xorjoep | 1:24714b45cd1b | 131 | fnext4 = __SSAT(fnext4, 16); |
xorjoep | 1:24714b45cd1b | 132 | gnext4 = (q31_t) ((fcurnt4 * (*pk++)) >> 15U) + fcurnt3; |
xorjoep | 1:24714b45cd1b | 133 | gnext4 = __SSAT(gnext4, 16); |
xorjoep | 1:24714b45cd1b | 134 | |
xorjoep | 1:24714b45cd1b | 135 | /* Update of f values for next coefficient set processing */ |
xorjoep | 1:24714b45cd1b | 136 | fcurnt1 = fnext1; |
xorjoep | 1:24714b45cd1b | 137 | fcurnt2 = fnext2; |
xorjoep | 1:24714b45cd1b | 138 | fcurnt3 = fnext3; |
xorjoep | 1:24714b45cd1b | 139 | fcurnt4 = fnext4; |
xorjoep | 1:24714b45cd1b | 140 | |
xorjoep | 1:24714b45cd1b | 141 | |
xorjoep | 1:24714b45cd1b | 142 | /* Loop unrolling. Process 4 taps at a time . */ |
xorjoep | 1:24714b45cd1b | 143 | stageCnt = (numStages - 1U) >> 2; |
xorjoep | 1:24714b45cd1b | 144 | |
xorjoep | 1:24714b45cd1b | 145 | |
xorjoep | 1:24714b45cd1b | 146 | /* Loop over the number of taps. Unroll by a factor of 4. |
xorjoep | 1:24714b45cd1b | 147 | ** Repeat until we've computed numStages-3 coefficients. */ |
xorjoep | 1:24714b45cd1b | 148 | |
xorjoep | 1:24714b45cd1b | 149 | /* Process 2nd, 3rd, 4th and 5th taps ... here */ |
xorjoep | 1:24714b45cd1b | 150 | while (stageCnt > 0U) |
xorjoep | 1:24714b45cd1b | 151 | { |
xorjoep | 1:24714b45cd1b | 152 | /* Read g1(n-1), g3(n-1) .... from state */ |
xorjoep | 1:24714b45cd1b | 153 | gcurnt1 = *px; |
xorjoep | 1:24714b45cd1b | 154 | |
xorjoep | 1:24714b45cd1b | 155 | /* save g1(n) in state buffer */ |
xorjoep | 1:24714b45cd1b | 156 | *px++ = (q15_t) gnext4; |
xorjoep | 1:24714b45cd1b | 157 | |
xorjoep | 1:24714b45cd1b | 158 | /* Process first sample for 2nd, 6th .. tap */ |
xorjoep | 1:24714b45cd1b | 159 | /* Sample processing for K2, K6.... */ |
xorjoep | 1:24714b45cd1b | 160 | /* f1(n) = f0(n) + K1 * g0(n-1) */ |
xorjoep | 1:24714b45cd1b | 161 | fnext1 = (q31_t) ((gcurnt1 * (*pk)) >> 15U) + fcurnt1; |
xorjoep | 1:24714b45cd1b | 162 | fnext1 = __SSAT(fnext1, 16); |
xorjoep | 1:24714b45cd1b | 163 | |
xorjoep | 1:24714b45cd1b | 164 | |
xorjoep | 1:24714b45cd1b | 165 | /* Process second sample for 2nd, 6th .. tap */ |
xorjoep | 1:24714b45cd1b | 166 | /* for sample 2 processing */ |
xorjoep | 1:24714b45cd1b | 167 | fnext2 = (q31_t) ((gnext1 * (*pk)) >> 15U) + fcurnt2; |
xorjoep | 1:24714b45cd1b | 168 | fnext2 = __SSAT(fnext2, 16); |
xorjoep | 1:24714b45cd1b | 169 | /* Process third sample for 2nd, 6th .. tap */ |
xorjoep | 1:24714b45cd1b | 170 | fnext3 = (q31_t) ((gnext2 * (*pk)) >> 15U) + fcurnt3; |
xorjoep | 1:24714b45cd1b | 171 | fnext3 = __SSAT(fnext3, 16); |
xorjoep | 1:24714b45cd1b | 172 | /* Process fourth sample for 2nd, 6th .. tap */ |
xorjoep | 1:24714b45cd1b | 173 | /* fnext4 = fcurnt4 + (*pk) * gnext3; */ |
xorjoep | 1:24714b45cd1b | 174 | fnext4 = (q31_t) ((gnext3 * (*pk)) >> 15U) + fcurnt4; |
xorjoep | 1:24714b45cd1b | 175 | fnext4 = __SSAT(fnext4, 16); |
xorjoep | 1:24714b45cd1b | 176 | |
xorjoep | 1:24714b45cd1b | 177 | /* g1(n) = f0(n) * K1 + g0(n-1) */ |
xorjoep | 1:24714b45cd1b | 178 | /* Calculation of state values for next stage */ |
xorjoep | 1:24714b45cd1b | 179 | gnext4 = (q31_t) ((fcurnt4 * (*pk)) >> 15U) + gnext3; |
xorjoep | 1:24714b45cd1b | 180 | gnext4 = __SSAT(gnext4, 16); |
xorjoep | 1:24714b45cd1b | 181 | gnext3 = (q31_t) ((fcurnt3 * (*pk)) >> 15U) + gnext2; |
xorjoep | 1:24714b45cd1b | 182 | gnext3 = __SSAT(gnext3, 16); |
xorjoep | 1:24714b45cd1b | 183 | |
xorjoep | 1:24714b45cd1b | 184 | gnext2 = (q31_t) ((fcurnt2 * (*pk)) >> 15U) + gnext1; |
xorjoep | 1:24714b45cd1b | 185 | gnext2 = __SSAT(gnext2, 16); |
xorjoep | 1:24714b45cd1b | 186 | |
xorjoep | 1:24714b45cd1b | 187 | gnext1 = (q31_t) ((fcurnt1 * (*pk++)) >> 15U) + gcurnt1; |
xorjoep | 1:24714b45cd1b | 188 | gnext1 = __SSAT(gnext1, 16); |
xorjoep | 1:24714b45cd1b | 189 | |
xorjoep | 1:24714b45cd1b | 190 | |
xorjoep | 1:24714b45cd1b | 191 | /* Read g2(n-1), g4(n-1) .... from state */ |
xorjoep | 1:24714b45cd1b | 192 | gcurnt1 = *px; |
xorjoep | 1:24714b45cd1b | 193 | |
xorjoep | 1:24714b45cd1b | 194 | /* save g1(n) in state buffer */ |
xorjoep | 1:24714b45cd1b | 195 | *px++ = (q15_t) gnext4; |
xorjoep | 1:24714b45cd1b | 196 | |
xorjoep | 1:24714b45cd1b | 197 | /* Sample processing for K3, K7.... */ |
xorjoep | 1:24714b45cd1b | 198 | /* Process first sample for 3rd, 7th .. tap */ |
xorjoep | 1:24714b45cd1b | 199 | /* f3(n) = f2(n) + K3 * g2(n-1) */ |
xorjoep | 1:24714b45cd1b | 200 | fcurnt1 = (q31_t) ((gcurnt1 * (*pk)) >> 15U) + fnext1; |
xorjoep | 1:24714b45cd1b | 201 | fcurnt1 = __SSAT(fcurnt1, 16); |
xorjoep | 1:24714b45cd1b | 202 | |
xorjoep | 1:24714b45cd1b | 203 | /* Process second sample for 3rd, 7th .. tap */ |
xorjoep | 1:24714b45cd1b | 204 | fcurnt2 = (q31_t) ((gnext1 * (*pk)) >> 15U) + fnext2; |
xorjoep | 1:24714b45cd1b | 205 | fcurnt2 = __SSAT(fcurnt2, 16); |
xorjoep | 1:24714b45cd1b | 206 | |
xorjoep | 1:24714b45cd1b | 207 | /* Process third sample for 3rd, 7th .. tap */ |
xorjoep | 1:24714b45cd1b | 208 | fcurnt3 = (q31_t) ((gnext2 * (*pk)) >> 15U) + fnext3; |
xorjoep | 1:24714b45cd1b | 209 | fcurnt3 = __SSAT(fcurnt3, 16); |
xorjoep | 1:24714b45cd1b | 210 | |
xorjoep | 1:24714b45cd1b | 211 | /* Process fourth sample for 3rd, 7th .. tap */ |
xorjoep | 1:24714b45cd1b | 212 | fcurnt4 = (q31_t) ((gnext3 * (*pk)) >> 15U) + fnext4; |
xorjoep | 1:24714b45cd1b | 213 | fcurnt4 = __SSAT(fcurnt4, 16); |
xorjoep | 1:24714b45cd1b | 214 | |
xorjoep | 1:24714b45cd1b | 215 | /* Calculation of state values for next stage */ |
xorjoep | 1:24714b45cd1b | 216 | /* g3(n) = f2(n) * K3 + g2(n-1) */ |
xorjoep | 1:24714b45cd1b | 217 | gnext4 = (q31_t) ((fnext4 * (*pk)) >> 15U) + gnext3; |
xorjoep | 1:24714b45cd1b | 218 | gnext4 = __SSAT(gnext4, 16); |
xorjoep | 1:24714b45cd1b | 219 | |
xorjoep | 1:24714b45cd1b | 220 | gnext3 = (q31_t) ((fnext3 * (*pk)) >> 15U) + gnext2; |
xorjoep | 1:24714b45cd1b | 221 | gnext3 = __SSAT(gnext3, 16); |
xorjoep | 1:24714b45cd1b | 222 | |
xorjoep | 1:24714b45cd1b | 223 | gnext2 = (q31_t) ((fnext2 * (*pk)) >> 15U) + gnext1; |
xorjoep | 1:24714b45cd1b | 224 | gnext2 = __SSAT(gnext2, 16); |
xorjoep | 1:24714b45cd1b | 225 | |
xorjoep | 1:24714b45cd1b | 226 | gnext1 = (q31_t) ((fnext1 * (*pk++)) >> 15U) + gcurnt1; |
xorjoep | 1:24714b45cd1b | 227 | gnext1 = __SSAT(gnext1, 16); |
xorjoep | 1:24714b45cd1b | 228 | |
xorjoep | 1:24714b45cd1b | 229 | /* Read g1(n-1), g3(n-1) .... from state */ |
xorjoep | 1:24714b45cd1b | 230 | gcurnt1 = *px; |
xorjoep | 1:24714b45cd1b | 231 | |
xorjoep | 1:24714b45cd1b | 232 | /* save g1(n) in state buffer */ |
xorjoep | 1:24714b45cd1b | 233 | *px++ = (q15_t) gnext4; |
xorjoep | 1:24714b45cd1b | 234 | |
xorjoep | 1:24714b45cd1b | 235 | /* Sample processing for K4, K8.... */ |
xorjoep | 1:24714b45cd1b | 236 | /* Process first sample for 4th, 8th .. tap */ |
xorjoep | 1:24714b45cd1b | 237 | /* f4(n) = f3(n) + K4 * g3(n-1) */ |
xorjoep | 1:24714b45cd1b | 238 | fnext1 = (q31_t) ((gcurnt1 * (*pk)) >> 15U) + fcurnt1; |
xorjoep | 1:24714b45cd1b | 239 | fnext1 = __SSAT(fnext1, 16); |
xorjoep | 1:24714b45cd1b | 240 | |
xorjoep | 1:24714b45cd1b | 241 | /* Process second sample for 4th, 8th .. tap */ |
xorjoep | 1:24714b45cd1b | 242 | /* for sample 2 processing */ |
xorjoep | 1:24714b45cd1b | 243 | fnext2 = (q31_t) ((gnext1 * (*pk)) >> 15U) + fcurnt2; |
xorjoep | 1:24714b45cd1b | 244 | fnext2 = __SSAT(fnext2, 16); |
xorjoep | 1:24714b45cd1b | 245 | |
xorjoep | 1:24714b45cd1b | 246 | /* Process third sample for 4th, 8th .. tap */ |
xorjoep | 1:24714b45cd1b | 247 | fnext3 = (q31_t) ((gnext2 * (*pk)) >> 15U) + fcurnt3; |
xorjoep | 1:24714b45cd1b | 248 | fnext3 = __SSAT(fnext3, 16); |
xorjoep | 1:24714b45cd1b | 249 | |
xorjoep | 1:24714b45cd1b | 250 | /* Process fourth sample for 4th, 8th .. tap */ |
xorjoep | 1:24714b45cd1b | 251 | fnext4 = (q31_t) ((gnext3 * (*pk)) >> 15U) + fcurnt4; |
xorjoep | 1:24714b45cd1b | 252 | fnext4 = __SSAT(fnext4, 16); |
xorjoep | 1:24714b45cd1b | 253 | |
xorjoep | 1:24714b45cd1b | 254 | /* g4(n) = f3(n) * K4 + g3(n-1) */ |
xorjoep | 1:24714b45cd1b | 255 | /* Calculation of state values for next stage */ |
xorjoep | 1:24714b45cd1b | 256 | gnext4 = (q31_t) ((fcurnt4 * (*pk)) >> 15U) + gnext3; |
xorjoep | 1:24714b45cd1b | 257 | gnext4 = __SSAT(gnext4, 16); |
xorjoep | 1:24714b45cd1b | 258 | |
xorjoep | 1:24714b45cd1b | 259 | gnext3 = (q31_t) ((fcurnt3 * (*pk)) >> 15U) + gnext2; |
xorjoep | 1:24714b45cd1b | 260 | gnext3 = __SSAT(gnext3, 16); |
xorjoep | 1:24714b45cd1b | 261 | |
xorjoep | 1:24714b45cd1b | 262 | gnext2 = (q31_t) ((fcurnt2 * (*pk)) >> 15U) + gnext1; |
xorjoep | 1:24714b45cd1b | 263 | gnext2 = __SSAT(gnext2, 16); |
xorjoep | 1:24714b45cd1b | 264 | gnext1 = (q31_t) ((fcurnt1 * (*pk++)) >> 15U) + gcurnt1; |
xorjoep | 1:24714b45cd1b | 265 | gnext1 = __SSAT(gnext1, 16); |
xorjoep | 1:24714b45cd1b | 266 | |
xorjoep | 1:24714b45cd1b | 267 | |
xorjoep | 1:24714b45cd1b | 268 | /* Read g2(n-1), g4(n-1) .... from state */ |
xorjoep | 1:24714b45cd1b | 269 | gcurnt1 = *px; |
xorjoep | 1:24714b45cd1b | 270 | |
xorjoep | 1:24714b45cd1b | 271 | /* save g4(n) in state buffer */ |
xorjoep | 1:24714b45cd1b | 272 | *px++ = (q15_t) gnext4; |
xorjoep | 1:24714b45cd1b | 273 | |
xorjoep | 1:24714b45cd1b | 274 | /* Sample processing for K5, K9.... */ |
xorjoep | 1:24714b45cd1b | 275 | /* Process first sample for 5th, 9th .. tap */ |
xorjoep | 1:24714b45cd1b | 276 | /* f5(n) = f4(n) + K5 * g4(n-1) */ |
xorjoep | 1:24714b45cd1b | 277 | fcurnt1 = (q31_t) ((gcurnt1 * (*pk)) >> 15U) + fnext1; |
xorjoep | 1:24714b45cd1b | 278 | fcurnt1 = __SSAT(fcurnt1, 16); |
xorjoep | 1:24714b45cd1b | 279 | |
xorjoep | 1:24714b45cd1b | 280 | /* Process second sample for 5th, 9th .. tap */ |
xorjoep | 1:24714b45cd1b | 281 | fcurnt2 = (q31_t) ((gnext1 * (*pk)) >> 15U) + fnext2; |
xorjoep | 1:24714b45cd1b | 282 | fcurnt2 = __SSAT(fcurnt2, 16); |
xorjoep | 1:24714b45cd1b | 283 | |
xorjoep | 1:24714b45cd1b | 284 | /* Process third sample for 5th, 9th .. tap */ |
xorjoep | 1:24714b45cd1b | 285 | fcurnt3 = (q31_t) ((gnext2 * (*pk)) >> 15U) + fnext3; |
xorjoep | 1:24714b45cd1b | 286 | fcurnt3 = __SSAT(fcurnt3, 16); |
xorjoep | 1:24714b45cd1b | 287 | |
xorjoep | 1:24714b45cd1b | 288 | /* Process fourth sample for 5th, 9th .. tap */ |
xorjoep | 1:24714b45cd1b | 289 | fcurnt4 = (q31_t) ((gnext3 * (*pk)) >> 15U) + fnext4; |
xorjoep | 1:24714b45cd1b | 290 | fcurnt4 = __SSAT(fcurnt4, 16); |
xorjoep | 1:24714b45cd1b | 291 | |
xorjoep | 1:24714b45cd1b | 292 | /* Calculation of state values for next stage */ |
xorjoep | 1:24714b45cd1b | 293 | /* g5(n) = f4(n) * K5 + g4(n-1) */ |
xorjoep | 1:24714b45cd1b | 294 | gnext4 = (q31_t) ((fnext4 * (*pk)) >> 15U) + gnext3; |
xorjoep | 1:24714b45cd1b | 295 | gnext4 = __SSAT(gnext4, 16); |
xorjoep | 1:24714b45cd1b | 296 | gnext3 = (q31_t) ((fnext3 * (*pk)) >> 15U) + gnext2; |
xorjoep | 1:24714b45cd1b | 297 | gnext3 = __SSAT(gnext3, 16); |
xorjoep | 1:24714b45cd1b | 298 | gnext2 = (q31_t) ((fnext2 * (*pk)) >> 15U) + gnext1; |
xorjoep | 1:24714b45cd1b | 299 | gnext2 = __SSAT(gnext2, 16); |
xorjoep | 1:24714b45cd1b | 300 | gnext1 = (q31_t) ((fnext1 * (*pk++)) >> 15U) + gcurnt1; |
xorjoep | 1:24714b45cd1b | 301 | gnext1 = __SSAT(gnext1, 16); |
xorjoep | 1:24714b45cd1b | 302 | |
xorjoep | 1:24714b45cd1b | 303 | stageCnt--; |
xorjoep | 1:24714b45cd1b | 304 | } |
xorjoep | 1:24714b45cd1b | 305 | |
xorjoep | 1:24714b45cd1b | 306 | /* If the (filter length -1) is not a multiple of 4, compute the remaining filter taps */ |
xorjoep | 1:24714b45cd1b | 307 | stageCnt = (numStages - 1U) % 0x4U; |
xorjoep | 1:24714b45cd1b | 308 | |
xorjoep | 1:24714b45cd1b | 309 | while (stageCnt > 0U) |
xorjoep | 1:24714b45cd1b | 310 | { |
xorjoep | 1:24714b45cd1b | 311 | gcurnt1 = *px; |
xorjoep | 1:24714b45cd1b | 312 | |
xorjoep | 1:24714b45cd1b | 313 | /* save g value in state buffer */ |
xorjoep | 1:24714b45cd1b | 314 | *px++ = (q15_t) gnext4; |
xorjoep | 1:24714b45cd1b | 315 | |
xorjoep | 1:24714b45cd1b | 316 | /* Process four samples for last three taps here */ |
xorjoep | 1:24714b45cd1b | 317 | fnext1 = (q31_t) ((gcurnt1 * (*pk)) >> 15U) + fcurnt1; |
xorjoep | 1:24714b45cd1b | 318 | fnext1 = __SSAT(fnext1, 16); |
xorjoep | 1:24714b45cd1b | 319 | fnext2 = (q31_t) ((gnext1 * (*pk)) >> 15U) + fcurnt2; |
xorjoep | 1:24714b45cd1b | 320 | fnext2 = __SSAT(fnext2, 16); |
xorjoep | 1:24714b45cd1b | 321 | |
xorjoep | 1:24714b45cd1b | 322 | fnext3 = (q31_t) ((gnext2 * (*pk)) >> 15U) + fcurnt3; |
xorjoep | 1:24714b45cd1b | 323 | fnext3 = __SSAT(fnext3, 16); |
xorjoep | 1:24714b45cd1b | 324 | |
xorjoep | 1:24714b45cd1b | 325 | fnext4 = (q31_t) ((gnext3 * (*pk)) >> 15U) + fcurnt4; |
xorjoep | 1:24714b45cd1b | 326 | fnext4 = __SSAT(fnext4, 16); |
xorjoep | 1:24714b45cd1b | 327 | |
xorjoep | 1:24714b45cd1b | 328 | /* g1(n) = f0(n) * K1 + g0(n-1) */ |
xorjoep | 1:24714b45cd1b | 329 | gnext4 = (q31_t) ((fcurnt4 * (*pk)) >> 15U) + gnext3; |
xorjoep | 1:24714b45cd1b | 330 | gnext4 = __SSAT(gnext4, 16); |
xorjoep | 1:24714b45cd1b | 331 | gnext3 = (q31_t) ((fcurnt3 * (*pk)) >> 15U) + gnext2; |
xorjoep | 1:24714b45cd1b | 332 | gnext3 = __SSAT(gnext3, 16); |
xorjoep | 1:24714b45cd1b | 333 | gnext2 = (q31_t) ((fcurnt2 * (*pk)) >> 15U) + gnext1; |
xorjoep | 1:24714b45cd1b | 334 | gnext2 = __SSAT(gnext2, 16); |
xorjoep | 1:24714b45cd1b | 335 | gnext1 = (q31_t) ((fcurnt1 * (*pk++)) >> 15U) + gcurnt1; |
xorjoep | 1:24714b45cd1b | 336 | gnext1 = __SSAT(gnext1, 16); |
xorjoep | 1:24714b45cd1b | 337 | |
xorjoep | 1:24714b45cd1b | 338 | /* Update of f values for next coefficient set processing */ |
xorjoep | 1:24714b45cd1b | 339 | fcurnt1 = fnext1; |
xorjoep | 1:24714b45cd1b | 340 | fcurnt2 = fnext2; |
xorjoep | 1:24714b45cd1b | 341 | fcurnt3 = fnext3; |
xorjoep | 1:24714b45cd1b | 342 | fcurnt4 = fnext4; |
xorjoep | 1:24714b45cd1b | 343 | |
xorjoep | 1:24714b45cd1b | 344 | stageCnt--; |
xorjoep | 1:24714b45cd1b | 345 | |
xorjoep | 1:24714b45cd1b | 346 | } |
xorjoep | 1:24714b45cd1b | 347 | |
xorjoep | 1:24714b45cd1b | 348 | /* The results in the 4 accumulators, store in the destination buffer. */ |
xorjoep | 1:24714b45cd1b | 349 | /* y(n) = fN(n) */ |
xorjoep | 1:24714b45cd1b | 350 | |
xorjoep | 1:24714b45cd1b | 351 | #ifndef ARM_MATH_BIG_ENDIAN |
xorjoep | 1:24714b45cd1b | 352 | |
xorjoep | 1:24714b45cd1b | 353 | *__SIMD32(pDst)++ = __PKHBT(fcurnt1, fcurnt2, 16); |
xorjoep | 1:24714b45cd1b | 354 | *__SIMD32(pDst)++ = __PKHBT(fcurnt3, fcurnt4, 16); |
xorjoep | 1:24714b45cd1b | 355 | |
xorjoep | 1:24714b45cd1b | 356 | #else |
xorjoep | 1:24714b45cd1b | 357 | |
xorjoep | 1:24714b45cd1b | 358 | *__SIMD32(pDst)++ = __PKHBT(fcurnt2, fcurnt1, 16); |
xorjoep | 1:24714b45cd1b | 359 | *__SIMD32(pDst)++ = __PKHBT(fcurnt4, fcurnt3, 16); |
xorjoep | 1:24714b45cd1b | 360 | |
xorjoep | 1:24714b45cd1b | 361 | #endif /* #ifndef ARM_MATH_BIG_ENDIAN */ |
xorjoep | 1:24714b45cd1b | 362 | |
xorjoep | 1:24714b45cd1b | 363 | blkCnt--; |
xorjoep | 1:24714b45cd1b | 364 | } |
xorjoep | 1:24714b45cd1b | 365 | |
xorjoep | 1:24714b45cd1b | 366 | /* If the blockSize is not a multiple of 4, compute any remaining output samples here. |
xorjoep | 1:24714b45cd1b | 367 | ** No loop unrolling is used. */ |
xorjoep | 1:24714b45cd1b | 368 | blkCnt = blockSize % 0x4U; |
xorjoep | 1:24714b45cd1b | 369 | |
xorjoep | 1:24714b45cd1b | 370 | while (blkCnt > 0U) |
xorjoep | 1:24714b45cd1b | 371 | { |
xorjoep | 1:24714b45cd1b | 372 | /* f0(n) = x(n) */ |
xorjoep | 1:24714b45cd1b | 373 | fcurnt1 = *pSrc++; |
xorjoep | 1:24714b45cd1b | 374 | |
xorjoep | 1:24714b45cd1b | 375 | /* Initialize coeff pointer */ |
xorjoep | 1:24714b45cd1b | 376 | pk = (pCoeffs); |
xorjoep | 1:24714b45cd1b | 377 | |
xorjoep | 1:24714b45cd1b | 378 | /* Initialize state pointer */ |
xorjoep | 1:24714b45cd1b | 379 | px = pState; |
xorjoep | 1:24714b45cd1b | 380 | |
xorjoep | 1:24714b45cd1b | 381 | /* read g2(n) from state buffer */ |
xorjoep | 1:24714b45cd1b | 382 | gcurnt1 = *px; |
xorjoep | 1:24714b45cd1b | 383 | |
xorjoep | 1:24714b45cd1b | 384 | /* for sample 1 processing */ |
xorjoep | 1:24714b45cd1b | 385 | /* f1(n) = f0(n) + K1 * g0(n-1) */ |
xorjoep | 1:24714b45cd1b | 386 | fnext1 = (((q31_t) gcurnt1 * (*pk)) >> 15U) + fcurnt1; |
xorjoep | 1:24714b45cd1b | 387 | fnext1 = __SSAT(fnext1, 16); |
xorjoep | 1:24714b45cd1b | 388 | |
xorjoep | 1:24714b45cd1b | 389 | |
xorjoep | 1:24714b45cd1b | 390 | /* g1(n) = f0(n) * K1 + g0(n-1) */ |
xorjoep | 1:24714b45cd1b | 391 | gnext1 = (((q31_t) fcurnt1 * (*pk++)) >> 15U) + gcurnt1; |
xorjoep | 1:24714b45cd1b | 392 | gnext1 = __SSAT(gnext1, 16); |
xorjoep | 1:24714b45cd1b | 393 | |
xorjoep | 1:24714b45cd1b | 394 | /* save g1(n) in state buffer */ |
xorjoep | 1:24714b45cd1b | 395 | *px++ = (q15_t) fcurnt1; |
xorjoep | 1:24714b45cd1b | 396 | |
xorjoep | 1:24714b45cd1b | 397 | /* f1(n) is saved in fcurnt1 |
xorjoep | 1:24714b45cd1b | 398 | for next stage processing */ |
xorjoep | 1:24714b45cd1b | 399 | fcurnt1 = fnext1; |
xorjoep | 1:24714b45cd1b | 400 | |
xorjoep | 1:24714b45cd1b | 401 | stageCnt = (numStages - 1U); |
xorjoep | 1:24714b45cd1b | 402 | |
xorjoep | 1:24714b45cd1b | 403 | /* stage loop */ |
xorjoep | 1:24714b45cd1b | 404 | while (stageCnt > 0U) |
xorjoep | 1:24714b45cd1b | 405 | { |
xorjoep | 1:24714b45cd1b | 406 | /* read g2(n) from state buffer */ |
xorjoep | 1:24714b45cd1b | 407 | gcurnt1 = *px; |
xorjoep | 1:24714b45cd1b | 408 | |
xorjoep | 1:24714b45cd1b | 409 | /* save g1(n) in state buffer */ |
xorjoep | 1:24714b45cd1b | 410 | *px++ = (q15_t) gnext1; |
xorjoep | 1:24714b45cd1b | 411 | |
xorjoep | 1:24714b45cd1b | 412 | /* Sample processing for K2, K3.... */ |
xorjoep | 1:24714b45cd1b | 413 | /* f2(n) = f1(n) + K2 * g1(n-1) */ |
xorjoep | 1:24714b45cd1b | 414 | fnext1 = (((q31_t) gcurnt1 * (*pk)) >> 15U) + fcurnt1; |
xorjoep | 1:24714b45cd1b | 415 | fnext1 = __SSAT(fnext1, 16); |
xorjoep | 1:24714b45cd1b | 416 | |
xorjoep | 1:24714b45cd1b | 417 | /* g2(n) = f1(n) * K2 + g1(n-1) */ |
xorjoep | 1:24714b45cd1b | 418 | gnext1 = (((q31_t) fcurnt1 * (*pk++)) >> 15U) + gcurnt1; |
xorjoep | 1:24714b45cd1b | 419 | gnext1 = __SSAT(gnext1, 16); |
xorjoep | 1:24714b45cd1b | 420 | |
xorjoep | 1:24714b45cd1b | 421 | |
xorjoep | 1:24714b45cd1b | 422 | /* f1(n) is saved in fcurnt1 |
xorjoep | 1:24714b45cd1b | 423 | for next stage processing */ |
xorjoep | 1:24714b45cd1b | 424 | fcurnt1 = fnext1; |
xorjoep | 1:24714b45cd1b | 425 | |
xorjoep | 1:24714b45cd1b | 426 | stageCnt--; |
xorjoep | 1:24714b45cd1b | 427 | |
xorjoep | 1:24714b45cd1b | 428 | } |
xorjoep | 1:24714b45cd1b | 429 | |
xorjoep | 1:24714b45cd1b | 430 | /* y(n) = fN(n) */ |
xorjoep | 1:24714b45cd1b | 431 | *pDst++ = __SSAT(fcurnt1, 16); |
xorjoep | 1:24714b45cd1b | 432 | |
xorjoep | 1:24714b45cd1b | 433 | |
xorjoep | 1:24714b45cd1b | 434 | blkCnt--; |
xorjoep | 1:24714b45cd1b | 435 | |
xorjoep | 1:24714b45cd1b | 436 | } |
xorjoep | 1:24714b45cd1b | 437 | |
xorjoep | 1:24714b45cd1b | 438 | #else |
xorjoep | 1:24714b45cd1b | 439 | |
xorjoep | 1:24714b45cd1b | 440 | /* Run the below code for Cortex-M0 */ |
xorjoep | 1:24714b45cd1b | 441 | |
xorjoep | 1:24714b45cd1b | 442 | q31_t fcurnt, fnext, gcurnt, gnext; /* temporary variables */ |
xorjoep | 1:24714b45cd1b | 443 | uint32_t numStages = S->numStages; /* Length of the filter */ |
xorjoep | 1:24714b45cd1b | 444 | uint32_t blkCnt, stageCnt; /* temporary variables for counts */ |
xorjoep | 1:24714b45cd1b | 445 | |
xorjoep | 1:24714b45cd1b | 446 | pState = &S->pState[0]; |
xorjoep | 1:24714b45cd1b | 447 | |
xorjoep | 1:24714b45cd1b | 448 | blkCnt = blockSize; |
xorjoep | 1:24714b45cd1b | 449 | |
xorjoep | 1:24714b45cd1b | 450 | while (blkCnt > 0U) |
xorjoep | 1:24714b45cd1b | 451 | { |
xorjoep | 1:24714b45cd1b | 452 | /* f0(n) = x(n) */ |
xorjoep | 1:24714b45cd1b | 453 | fcurnt = *pSrc++; |
xorjoep | 1:24714b45cd1b | 454 | |
xorjoep | 1:24714b45cd1b | 455 | /* Initialize coeff pointer */ |
xorjoep | 1:24714b45cd1b | 456 | pk = (pCoeffs); |
xorjoep | 1:24714b45cd1b | 457 | |
xorjoep | 1:24714b45cd1b | 458 | /* Initialize state pointer */ |
xorjoep | 1:24714b45cd1b | 459 | px = pState; |
xorjoep | 1:24714b45cd1b | 460 | |
xorjoep | 1:24714b45cd1b | 461 | /* read g0(n-1) from state buffer */ |
xorjoep | 1:24714b45cd1b | 462 | gcurnt = *px; |
xorjoep | 1:24714b45cd1b | 463 | |
xorjoep | 1:24714b45cd1b | 464 | /* for sample 1 processing */ |
xorjoep | 1:24714b45cd1b | 465 | /* f1(n) = f0(n) + K1 * g0(n-1) */ |
xorjoep | 1:24714b45cd1b | 466 | fnext = ((gcurnt * (*pk)) >> 15U) + fcurnt; |
xorjoep | 1:24714b45cd1b | 467 | fnext = __SSAT(fnext, 16); |
xorjoep | 1:24714b45cd1b | 468 | |
xorjoep | 1:24714b45cd1b | 469 | |
xorjoep | 1:24714b45cd1b | 470 | /* g1(n) = f0(n) * K1 + g0(n-1) */ |
xorjoep | 1:24714b45cd1b | 471 | gnext = ((fcurnt * (*pk++)) >> 15U) + gcurnt; |
xorjoep | 1:24714b45cd1b | 472 | gnext = __SSAT(gnext, 16); |
xorjoep | 1:24714b45cd1b | 473 | |
xorjoep | 1:24714b45cd1b | 474 | /* save f0(n) in state buffer */ |
xorjoep | 1:24714b45cd1b | 475 | *px++ = (q15_t) fcurnt; |
xorjoep | 1:24714b45cd1b | 476 | |
xorjoep | 1:24714b45cd1b | 477 | /* f1(n) is saved in fcurnt |
xorjoep | 1:24714b45cd1b | 478 | for next stage processing */ |
xorjoep | 1:24714b45cd1b | 479 | fcurnt = fnext; |
xorjoep | 1:24714b45cd1b | 480 | |
xorjoep | 1:24714b45cd1b | 481 | stageCnt = (numStages - 1U); |
xorjoep | 1:24714b45cd1b | 482 | |
xorjoep | 1:24714b45cd1b | 483 | /* stage loop */ |
xorjoep | 1:24714b45cd1b | 484 | while (stageCnt > 0U) |
xorjoep | 1:24714b45cd1b | 485 | { |
xorjoep | 1:24714b45cd1b | 486 | /* read g1(n-1) from state buffer */ |
xorjoep | 1:24714b45cd1b | 487 | gcurnt = *px; |
xorjoep | 1:24714b45cd1b | 488 | |
xorjoep | 1:24714b45cd1b | 489 | /* save g0(n-1) in state buffer */ |
xorjoep | 1:24714b45cd1b | 490 | *px++ = (q15_t) gnext; |
xorjoep | 1:24714b45cd1b | 491 | |
xorjoep | 1:24714b45cd1b | 492 | /* Sample processing for K2, K3.... */ |
xorjoep | 1:24714b45cd1b | 493 | /* f2(n) = f1(n) + K2 * g1(n-1) */ |
xorjoep | 1:24714b45cd1b | 494 | fnext = ((gcurnt * (*pk)) >> 15U) + fcurnt; |
xorjoep | 1:24714b45cd1b | 495 | fnext = __SSAT(fnext, 16); |
xorjoep | 1:24714b45cd1b | 496 | |
xorjoep | 1:24714b45cd1b | 497 | /* g2(n) = f1(n) * K2 + g1(n-1) */ |
xorjoep | 1:24714b45cd1b | 498 | gnext = ((fcurnt * (*pk++)) >> 15U) + gcurnt; |
xorjoep | 1:24714b45cd1b | 499 | gnext = __SSAT(gnext, 16); |
xorjoep | 1:24714b45cd1b | 500 | |
xorjoep | 1:24714b45cd1b | 501 | |
xorjoep | 1:24714b45cd1b | 502 | /* f1(n) is saved in fcurnt |
xorjoep | 1:24714b45cd1b | 503 | for next stage processing */ |
xorjoep | 1:24714b45cd1b | 504 | fcurnt = fnext; |
xorjoep | 1:24714b45cd1b | 505 | |
xorjoep | 1:24714b45cd1b | 506 | stageCnt--; |
xorjoep | 1:24714b45cd1b | 507 | |
xorjoep | 1:24714b45cd1b | 508 | } |
xorjoep | 1:24714b45cd1b | 509 | |
xorjoep | 1:24714b45cd1b | 510 | /* y(n) = fN(n) */ |
xorjoep | 1:24714b45cd1b | 511 | *pDst++ = __SSAT(fcurnt, 16); |
xorjoep | 1:24714b45cd1b | 512 | |
xorjoep | 1:24714b45cd1b | 513 | |
xorjoep | 1:24714b45cd1b | 514 | blkCnt--; |
xorjoep | 1:24714b45cd1b | 515 | |
xorjoep | 1:24714b45cd1b | 516 | } |
xorjoep | 1:24714b45cd1b | 517 | |
xorjoep | 1:24714b45cd1b | 518 | #endif /* #if defined (ARM_MATH_DSP) */ |
xorjoep | 1:24714b45cd1b | 519 | |
xorjoep | 1:24714b45cd1b | 520 | } |
xorjoep | 1:24714b45cd1b | 521 | |
xorjoep | 1:24714b45cd1b | 522 | /** |
xorjoep | 1:24714b45cd1b | 523 | * @} end of FIR_Lattice group |
xorjoep | 1:24714b45cd1b | 524 | */ |