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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 2 | mjames | 1 | /* ---------------------------------------------------------------------- |
| 2 | * Copyright (C) 2010-2014 ARM Limited. All rights reserved. |
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| 3 | * |
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| 4 | * $Date: 19. March 2015 |
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| 5 | * $Revision: V.1.4.5 |
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| 6 | * |
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| 7 | * Project: CMSIS DSP Library |
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| 8 | * Title: arm_cfft_radix2_q15.c |
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| 9 | * |
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| 10 | * Description: Radix-2 Decimation in Frequency CFFT & CIFFT Fixed point processing function |
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| 11 | * |
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| 12 | * |
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| 13 | * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0 |
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| 14 | * |
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| 15 | * Redistribution and use in source and binary forms, with or without |
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| 16 | * modification, are permitted provided that the following conditions |
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| 17 | * are met: |
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| 18 | * - Redistributions of source code must retain the above copyright |
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| 19 | * notice, this list of conditions and the following disclaimer. |
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| 20 | * - Redistributions in binary form must reproduce the above copyright |
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| 21 | * notice, this list of conditions and the following disclaimer in |
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| 22 | * the documentation and/or other materials provided with the |
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| 23 | * distribution. |
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| 24 | * - Neither the name of ARM LIMITED nor the names of its contributors |
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| 25 | * may be used to endorse or promote products derived from this |
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| 26 | * software without specific prior written permission. |
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| 27 | * |
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| 28 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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| 29 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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| 30 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
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| 31 | * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
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| 32 | * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 33 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
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| 34 | * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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| 35 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
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| 36 | * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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| 37 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
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| 38 | * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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| 39 | * POSSIBILITY OF SUCH DAMAGE. |
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| 40 | * -------------------------------------------------------------------- */ |
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| 41 | |||
| 42 | #include "arm_math.h" |
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| 43 | |||
| 44 | void arm_radix2_butterfly_q15( |
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| 45 | q15_t * pSrc, |
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| 46 | uint32_t fftLen, |
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| 47 | q15_t * pCoef, |
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| 48 | uint16_t twidCoefModifier); |
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| 49 | |||
| 50 | void arm_radix2_butterfly_inverse_q15( |
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| 51 | q15_t * pSrc, |
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| 52 | uint32_t fftLen, |
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| 53 | q15_t * pCoef, |
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| 54 | uint16_t twidCoefModifier); |
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| 55 | |||
| 56 | void arm_bitreversal_q15( |
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| 57 | q15_t * pSrc, |
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| 58 | uint32_t fftLen, |
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| 59 | uint16_t bitRevFactor, |
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| 60 | uint16_t * pBitRevTab); |
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| 61 | |||
| 62 | /** |
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| 63 | * @ingroup groupTransforms |
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| 64 | */ |
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| 65 | |||
| 66 | /** |
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| 67 | * @addtogroup ComplexFFT |
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| 68 | * @{ |
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| 69 | */ |
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| 70 | |||
| 71 | /** |
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| 72 | * @details |
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| 73 | * @brief Processing function for the fixed-point CFFT/CIFFT. |
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| 74 | * @deprecated Do not use this function. It has been superseded by \ref arm_cfft_q15 and will be removed |
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| 75 | * @param[in] *S points to an instance of the fixed-point CFFT/CIFFT structure. |
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| 76 | * @param[in, out] *pSrc points to the complex data buffer of size <code>2*fftLen</code>. Processing occurs in-place. |
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| 77 | * @return none. |
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| 78 | */ |
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| 79 | |||
| 80 | void arm_cfft_radix2_q15( |
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| 81 | const arm_cfft_radix2_instance_q15 * S, |
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| 82 | q15_t * pSrc) |
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| 83 | { |
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| 84 | |||
| 85 | if(S->ifftFlag == 1u) |
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| 86 | { |
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| 87 | arm_radix2_butterfly_inverse_q15(pSrc, S->fftLen, |
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| 88 | S->pTwiddle, S->twidCoefModifier); |
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| 89 | } |
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| 90 | else |
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| 91 | { |
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| 92 | arm_radix2_butterfly_q15(pSrc, S->fftLen, |
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| 93 | S->pTwiddle, S->twidCoefModifier); |
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| 94 | } |
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| 95 | |||
| 96 | arm_bitreversal_q15(pSrc, S->fftLen, S->bitRevFactor, S->pBitRevTable); |
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| 97 | } |
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| 98 | |||
| 99 | /** |
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| 100 | * @} end of ComplexFFT group |
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| 101 | */ |
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| 102 | |||
| 103 | void arm_radix2_butterfly_q15( |
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| 104 | q15_t * pSrc, |
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| 105 | uint32_t fftLen, |
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| 106 | q15_t * pCoef, |
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| 107 | uint16_t twidCoefModifier) |
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| 108 | { |
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| 109 | #ifndef ARM_MATH_CM0_FAMILY |
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| 110 | |||
| 111 | unsigned i, j, k, l; |
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| 112 | unsigned n1, n2, ia; |
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| 113 | q15_t in; |
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| 114 | q31_t T, S, R; |
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| 115 | q31_t coeff, out1, out2; |
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| 116 | |||
| 117 | //N = fftLen; |
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| 118 | n2 = fftLen; |
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| 119 | |||
| 120 | n1 = n2; |
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| 121 | n2 = n2 >> 1; |
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| 122 | ia = 0; |
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| 123 | |||
| 124 | // loop for groups |
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| 125 | for (i = 0; i < n2; i++) |
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| 126 | { |
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| 127 | coeff = _SIMD32_OFFSET(pCoef + (ia * 2u)); |
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| 128 | |||
| 129 | ia = ia + twidCoefModifier; |
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| 130 | |||
| 131 | l = i + n2; |
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| 132 | |||
| 133 | T = _SIMD32_OFFSET(pSrc + (2 * i)); |
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| 134 | in = ((int16_t) (T & 0xFFFF)) >> 1; |
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| 135 | T = ((T >> 1) & 0xFFFF0000) | (in & 0xFFFF); |
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| 136 | |||
| 137 | S = _SIMD32_OFFSET(pSrc + (2 * l)); |
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| 138 | in = ((int16_t) (S & 0xFFFF)) >> 1; |
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| 139 | S = ((S >> 1) & 0xFFFF0000) | (in & 0xFFFF); |
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| 140 | |||
| 141 | R = __QSUB16(T, S); |
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| 142 | |||
| 143 | _SIMD32_OFFSET(pSrc + (2 * i)) = __SHADD16(T, S); |
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| 144 | |||
| 145 | #ifndef ARM_MATH_BIG_ENDIAN |
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| 146 | |||
| 147 | out1 = __SMUAD(coeff, R) >> 16; |
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| 148 | out2 = __SMUSDX(coeff, R); |
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| 149 | |||
| 150 | #else |
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| 151 | |||
| 152 | out1 = __SMUSDX(R, coeff) >> 16u; |
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| 153 | out2 = __SMUAD(coeff, R); |
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| 154 | |||
| 155 | #endif // #ifndef ARM_MATH_BIG_ENDIAN |
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| 156 | |||
| 157 | _SIMD32_OFFSET(pSrc + (2u * l)) = |
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| 158 | (q31_t) ((out2) & 0xFFFF0000) | (out1 & 0x0000FFFF); |
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| 159 | |||
| 160 | coeff = _SIMD32_OFFSET(pCoef + (ia * 2u)); |
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| 161 | |||
| 162 | ia = ia + twidCoefModifier; |
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| 163 | |||
| 164 | // loop for butterfly |
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| 165 | i++; |
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| 166 | l++; |
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| 167 | |||
| 168 | T = _SIMD32_OFFSET(pSrc + (2 * i)); |
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| 169 | in = ((int16_t) (T & 0xFFFF)) >> 1; |
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| 170 | T = ((T >> 1) & 0xFFFF0000) | (in & 0xFFFF); |
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| 171 | |||
| 172 | S = _SIMD32_OFFSET(pSrc + (2 * l)); |
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| 173 | in = ((int16_t) (S & 0xFFFF)) >> 1; |
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| 174 | S = ((S >> 1) & 0xFFFF0000) | (in & 0xFFFF); |
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| 175 | |||
| 176 | R = __QSUB16(T, S); |
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| 177 | |||
| 178 | _SIMD32_OFFSET(pSrc + (2 * i)) = __SHADD16(T, S); |
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| 179 | |||
| 180 | #ifndef ARM_MATH_BIG_ENDIAN |
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| 181 | |||
| 182 | out1 = __SMUAD(coeff, R) >> 16; |
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| 183 | out2 = __SMUSDX(coeff, R); |
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| 184 | |||
| 185 | #else |
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| 186 | |||
| 187 | out1 = __SMUSDX(R, coeff) >> 16u; |
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| 188 | out2 = __SMUAD(coeff, R); |
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| 189 | |||
| 190 | #endif // #ifndef ARM_MATH_BIG_ENDIAN |
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| 191 | |||
| 192 | _SIMD32_OFFSET(pSrc + (2u * l)) = |
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| 193 | (q31_t) ((out2) & 0xFFFF0000) | (out1 & 0x0000FFFF); |
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| 194 | |||
| 195 | } // groups loop end |
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| 196 | |||
| 197 | twidCoefModifier = twidCoefModifier << 1u; |
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| 198 | |||
| 199 | // loop for stage |
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| 200 | for (k = fftLen / 2; k > 2; k = k >> 1) |
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| 201 | { |
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| 202 | n1 = n2; |
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| 203 | n2 = n2 >> 1; |
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| 204 | ia = 0; |
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| 205 | |||
| 206 | // loop for groups |
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| 207 | for (j = 0; j < n2; j++) |
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| 208 | { |
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| 209 | coeff = _SIMD32_OFFSET(pCoef + (ia * 2u)); |
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| 210 | |||
| 211 | ia = ia + twidCoefModifier; |
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| 212 | |||
| 213 | // loop for butterfly |
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| 214 | for (i = j; i < fftLen; i += n1) |
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| 215 | { |
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| 216 | l = i + n2; |
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| 217 | |||
| 218 | T = _SIMD32_OFFSET(pSrc + (2 * i)); |
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| 219 | |||
| 220 | S = _SIMD32_OFFSET(pSrc + (2 * l)); |
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| 221 | |||
| 222 | R = __QSUB16(T, S); |
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| 223 | |||
| 224 | _SIMD32_OFFSET(pSrc + (2 * i)) = __SHADD16(T, S); |
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| 225 | |||
| 226 | #ifndef ARM_MATH_BIG_ENDIAN |
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| 227 | |||
| 228 | out1 = __SMUAD(coeff, R) >> 16; |
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| 229 | out2 = __SMUSDX(coeff, R); |
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| 230 | |||
| 231 | #else |
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| 232 | |||
| 233 | out1 = __SMUSDX(R, coeff) >> 16u; |
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| 234 | out2 = __SMUAD(coeff, R); |
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| 235 | |||
| 236 | #endif // #ifndef ARM_MATH_BIG_ENDIAN |
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| 237 | |||
| 238 | _SIMD32_OFFSET(pSrc + (2u * l)) = |
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| 239 | (q31_t) ((out2) & 0xFFFF0000) | (out1 & 0x0000FFFF); |
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| 240 | |||
| 241 | i += n1; |
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| 242 | |||
| 243 | l = i + n2; |
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| 244 | |||
| 245 | T = _SIMD32_OFFSET(pSrc + (2 * i)); |
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| 246 | |||
| 247 | S = _SIMD32_OFFSET(pSrc + (2 * l)); |
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| 248 | |||
| 249 | R = __QSUB16(T, S); |
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| 250 | |||
| 251 | _SIMD32_OFFSET(pSrc + (2 * i)) = __SHADD16(T, S); |
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| 252 | |||
| 253 | #ifndef ARM_MATH_BIG_ENDIAN |
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| 254 | |||
| 255 | out1 = __SMUAD(coeff, R) >> 16; |
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| 256 | out2 = __SMUSDX(coeff, R); |
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| 257 | |||
| 258 | #else |
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| 259 | |||
| 260 | out1 = __SMUSDX(R, coeff) >> 16u; |
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| 261 | out2 = __SMUAD(coeff, R); |
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| 262 | |||
| 263 | #endif // #ifndef ARM_MATH_BIG_ENDIAN |
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| 264 | |||
| 265 | _SIMD32_OFFSET(pSrc + (2u * l)) = |
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| 266 | (q31_t) ((out2) & 0xFFFF0000) | (out1 & 0x0000FFFF); |
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| 267 | |||
| 268 | } // butterfly loop end |
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| 269 | |||
| 270 | } // groups loop end |
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| 271 | |||
| 272 | twidCoefModifier = twidCoefModifier << 1u; |
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| 273 | } // stages loop end |
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| 274 | |||
| 275 | n1 = n2; |
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| 276 | n2 = n2 >> 1; |
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| 277 | ia = 0; |
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| 278 | |||
| 279 | coeff = _SIMD32_OFFSET(pCoef + (ia * 2u)); |
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| 280 | |||
| 281 | ia = ia + twidCoefModifier; |
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| 282 | |||
| 283 | // loop for butterfly |
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| 284 | for (i = 0; i < fftLen; i += n1) |
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| 285 | { |
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| 286 | l = i + n2; |
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| 287 | |||
| 288 | T = _SIMD32_OFFSET(pSrc + (2 * i)); |
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| 289 | |||
| 290 | S = _SIMD32_OFFSET(pSrc + (2 * l)); |
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| 291 | |||
| 292 | R = __QSUB16(T, S); |
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| 293 | |||
| 294 | _SIMD32_OFFSET(pSrc + (2 * i)) = __QADD16(T, S); |
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| 295 | |||
| 296 | _SIMD32_OFFSET(pSrc + (2u * l)) = R; |
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| 297 | |||
| 298 | i += n1; |
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| 299 | l = i + n2; |
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| 300 | |||
| 301 | T = _SIMD32_OFFSET(pSrc + (2 * i)); |
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| 302 | |||
| 303 | S = _SIMD32_OFFSET(pSrc + (2 * l)); |
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| 304 | |||
| 305 | R = __QSUB16(T, S); |
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| 306 | |||
| 307 | _SIMD32_OFFSET(pSrc + (2 * i)) = __QADD16(T, S); |
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| 308 | |||
| 309 | _SIMD32_OFFSET(pSrc + (2u * l)) = R; |
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| 310 | |||
| 311 | } // groups loop end |
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| 312 | |||
| 313 | |||
| 314 | #else |
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| 315 | |||
| 316 | unsigned i, j, k, l; |
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| 317 | unsigned n1, n2, ia; |
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| 318 | q15_t xt, yt, cosVal, sinVal; |
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| 319 | |||
| 320 | |||
| 321 | //N = fftLen; |
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| 322 | n2 = fftLen; |
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| 323 | |||
| 324 | n1 = n2; |
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| 325 | n2 = n2 >> 1; |
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| 326 | ia = 0; |
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| 327 | |||
| 328 | // loop for groups |
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| 329 | for (j = 0; j < n2; j++) |
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| 330 | { |
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| 331 | cosVal = pCoef[ia * 2]; |
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| 332 | sinVal = pCoef[(ia * 2) + 1]; |
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| 333 | ia = ia + twidCoefModifier; |
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| 334 | |||
| 335 | // loop for butterfly |
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| 336 | for (i = j; i < fftLen; i += n1) |
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| 337 | { |
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| 338 | l = i + n2; |
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| 339 | xt = (pSrc[2 * i] >> 1u) - (pSrc[2 * l] >> 1u); |
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| 340 | pSrc[2 * i] = ((pSrc[2 * i] >> 1u) + (pSrc[2 * l] >> 1u)) >> 1u; |
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| 341 | |||
| 342 | yt = (pSrc[2 * i + 1] >> 1u) - (pSrc[2 * l + 1] >> 1u); |
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| 343 | pSrc[2 * i + 1] = |
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| 344 | ((pSrc[2 * l + 1] >> 1u) + (pSrc[2 * i + 1] >> 1u)) >> 1u; |
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| 345 | |||
| 346 | pSrc[2u * l] = (((int16_t) (((q31_t) xt * cosVal) >> 16)) + |
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| 347 | ((int16_t) (((q31_t) yt * sinVal) >> 16))); |
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| 348 | |||
| 349 | pSrc[2u * l + 1u] = (((int16_t) (((q31_t) yt * cosVal) >> 16)) - |
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| 350 | ((int16_t) (((q31_t) xt * sinVal) >> 16))); |
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| 351 | |||
| 352 | } // butterfly loop end |
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| 353 | |||
| 354 | } // groups loop end |
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| 355 | |||
| 356 | twidCoefModifier = twidCoefModifier << 1u; |
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| 357 | |||
| 358 | // loop for stage |
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| 359 | for (k = fftLen / 2; k > 2; k = k >> 1) |
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| 360 | { |
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| 361 | n1 = n2; |
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| 362 | n2 = n2 >> 1; |
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| 363 | ia = 0; |
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| 364 | |||
| 365 | // loop for groups |
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| 366 | for (j = 0; j < n2; j++) |
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| 367 | { |
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| 368 | cosVal = pCoef[ia * 2]; |
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| 369 | sinVal = pCoef[(ia * 2) + 1]; |
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| 370 | ia = ia + twidCoefModifier; |
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| 371 | |||
| 372 | // loop for butterfly |
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| 373 | for (i = j; i < fftLen; i += n1) |
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| 374 | { |
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| 375 | l = i + n2; |
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| 376 | xt = pSrc[2 * i] - pSrc[2 * l]; |
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| 377 | pSrc[2 * i] = (pSrc[2 * i] + pSrc[2 * l]) >> 1u; |
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| 378 | |||
| 379 | yt = pSrc[2 * i + 1] - pSrc[2 * l + 1]; |
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| 380 | pSrc[2 * i + 1] = (pSrc[2 * l + 1] + pSrc[2 * i + 1]) >> 1u; |
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| 381 | |||
| 382 | pSrc[2u * l] = (((int16_t) (((q31_t) xt * cosVal) >> 16)) + |
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| 383 | ((int16_t) (((q31_t) yt * sinVal) >> 16))); |
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| 384 | |||
| 385 | pSrc[2u * l + 1u] = (((int16_t) (((q31_t) yt * cosVal) >> 16)) - |
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| 386 | ((int16_t) (((q31_t) xt * sinVal) >> 16))); |
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| 387 | |||
| 388 | } // butterfly loop end |
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| 389 | |||
| 390 | } // groups loop end |
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| 391 | |||
| 392 | twidCoefModifier = twidCoefModifier << 1u; |
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| 393 | } // stages loop end |
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| 394 | |||
| 395 | n1 = n2; |
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| 396 | n2 = n2 >> 1; |
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| 397 | ia = 0; |
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| 398 | |||
| 399 | // loop for groups |
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| 400 | for (j = 0; j < n2; j++) |
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| 401 | { |
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| 402 | cosVal = pCoef[ia * 2]; |
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| 403 | sinVal = pCoef[(ia * 2) + 1]; |
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| 404 | |||
| 405 | ia = ia + twidCoefModifier; |
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| 406 | |||
| 407 | // loop for butterfly |
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| 408 | for (i = j; i < fftLen; i += n1) |
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| 409 | { |
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| 410 | l = i + n2; |
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| 411 | xt = pSrc[2 * i] - pSrc[2 * l]; |
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| 412 | pSrc[2 * i] = (pSrc[2 * i] + pSrc[2 * l]); |
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| 413 | |||
| 414 | yt = pSrc[2 * i + 1] - pSrc[2 * l + 1]; |
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| 415 | pSrc[2 * i + 1] = (pSrc[2 * l + 1] + pSrc[2 * i + 1]); |
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| 416 | |||
| 417 | pSrc[2u * l] = xt; |
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| 418 | |||
| 419 | pSrc[2u * l + 1u] = yt; |
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| 420 | |||
| 421 | } // butterfly loop end |
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| 422 | |||
| 423 | } // groups loop end |
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| 424 | |||
| 425 | twidCoefModifier = twidCoefModifier << 1u; |
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| 426 | |||
| 427 | #endif // #ifndef ARM_MATH_CM0_FAMILY |
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| 428 | |||
| 429 | } |
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| 430 | |||
| 431 | |||
| 432 | void arm_radix2_butterfly_inverse_q15( |
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| 433 | q15_t * pSrc, |
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| 434 | uint32_t fftLen, |
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| 435 | q15_t * pCoef, |
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| 436 | uint16_t twidCoefModifier) |
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| 437 | { |
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| 438 | #ifndef ARM_MATH_CM0_FAMILY |
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| 439 | |||
| 440 | unsigned i, j, k, l; |
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| 441 | unsigned n1, n2, ia; |
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| 442 | q15_t in; |
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| 443 | q31_t T, S, R; |
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| 444 | q31_t coeff, out1, out2; |
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| 445 | |||
| 446 | //N = fftLen; |
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| 447 | n2 = fftLen; |
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| 448 | |||
| 449 | n1 = n2; |
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| 450 | n2 = n2 >> 1; |
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| 451 | ia = 0; |
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| 452 | |||
| 453 | // loop for groups |
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| 454 | for (i = 0; i < n2; i++) |
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| 455 | { |
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| 456 | coeff = _SIMD32_OFFSET(pCoef + (ia * 2u)); |
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| 457 | |||
| 458 | ia = ia + twidCoefModifier; |
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| 459 | |||
| 460 | l = i + n2; |
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| 461 | |||
| 462 | T = _SIMD32_OFFSET(pSrc + (2 * i)); |
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| 463 | in = ((int16_t) (T & 0xFFFF)) >> 1; |
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| 464 | T = ((T >> 1) & 0xFFFF0000) | (in & 0xFFFF); |
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| 465 | |||
| 466 | S = _SIMD32_OFFSET(pSrc + (2 * l)); |
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| 467 | in = ((int16_t) (S & 0xFFFF)) >> 1; |
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| 468 | S = ((S >> 1) & 0xFFFF0000) | (in & 0xFFFF); |
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| 469 | |||
| 470 | R = __QSUB16(T, S); |
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| 471 | |||
| 472 | _SIMD32_OFFSET(pSrc + (2 * i)) = __SHADD16(T, S); |
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| 473 | |||
| 474 | #ifndef ARM_MATH_BIG_ENDIAN |
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| 475 | |||
| 476 | out1 = __SMUSD(coeff, R) >> 16; |
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| 477 | out2 = __SMUADX(coeff, R); |
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| 478 | #else |
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| 479 | |||
| 480 | out1 = __SMUADX(R, coeff) >> 16u; |
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| 481 | out2 = __SMUSD(__QSUB(0, coeff), R); |
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| 482 | |||
| 483 | #endif // #ifndef ARM_MATH_BIG_ENDIAN |
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| 484 | |||
| 485 | _SIMD32_OFFSET(pSrc + (2u * l)) = |
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| 486 | (q31_t) ((out2) & 0xFFFF0000) | (out1 & 0x0000FFFF); |
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| 487 | |||
| 488 | coeff = _SIMD32_OFFSET(pCoef + (ia * 2u)); |
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| 489 | |||
| 490 | ia = ia + twidCoefModifier; |
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| 491 | |||
| 492 | // loop for butterfly |
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| 493 | i++; |
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| 494 | l++; |
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| 495 | |||
| 496 | T = _SIMD32_OFFSET(pSrc + (2 * i)); |
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| 497 | in = ((int16_t) (T & 0xFFFF)) >> 1; |
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| 498 | T = ((T >> 1) & 0xFFFF0000) | (in & 0xFFFF); |
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| 499 | |||
| 500 | S = _SIMD32_OFFSET(pSrc + (2 * l)); |
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| 501 | in = ((int16_t) (S & 0xFFFF)) >> 1; |
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| 502 | S = ((S >> 1) & 0xFFFF0000) | (in & 0xFFFF); |
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| 503 | |||
| 504 | R = __QSUB16(T, S); |
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| 505 | |||
| 506 | _SIMD32_OFFSET(pSrc + (2 * i)) = __SHADD16(T, S); |
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| 507 | |||
| 508 | #ifndef ARM_MATH_BIG_ENDIAN |
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| 509 | |||
| 510 | out1 = __SMUSD(coeff, R) >> 16; |
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| 511 | out2 = __SMUADX(coeff, R); |
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| 512 | #else |
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| 513 | |||
| 514 | out1 = __SMUADX(R, coeff) >> 16u; |
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| 515 | out2 = __SMUSD(__QSUB(0, coeff), R); |
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| 516 | |||
| 517 | #endif // #ifndef ARM_MATH_BIG_ENDIAN |
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| 518 | |||
| 519 | _SIMD32_OFFSET(pSrc + (2u * l)) = |
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| 520 | (q31_t) ((out2) & 0xFFFF0000) | (out1 & 0x0000FFFF); |
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| 521 | |||
| 522 | } // groups loop end |
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| 523 | |||
| 524 | twidCoefModifier = twidCoefModifier << 1u; |
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| 525 | |||
| 526 | // loop for stage |
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| 527 | for (k = fftLen / 2; k > 2; k = k >> 1) |
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| 528 | { |
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| 529 | n1 = n2; |
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| 530 | n2 = n2 >> 1; |
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| 531 | ia = 0; |
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| 532 | |||
| 533 | // loop for groups |
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| 534 | for (j = 0; j < n2; j++) |
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| 535 | { |
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| 536 | coeff = _SIMD32_OFFSET(pCoef + (ia * 2u)); |
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| 537 | |||
| 538 | ia = ia + twidCoefModifier; |
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| 539 | |||
| 540 | // loop for butterfly |
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| 541 | for (i = j; i < fftLen; i += n1) |
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| 542 | { |
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| 543 | l = i + n2; |
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| 544 | |||
| 545 | T = _SIMD32_OFFSET(pSrc + (2 * i)); |
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| 546 | |||
| 547 | S = _SIMD32_OFFSET(pSrc + (2 * l)); |
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| 548 | |||
| 549 | R = __QSUB16(T, S); |
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| 550 | |||
| 551 | _SIMD32_OFFSET(pSrc + (2 * i)) = __SHADD16(T, S); |
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| 552 | |||
| 553 | #ifndef ARM_MATH_BIG_ENDIAN |
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| 554 | |||
| 555 | out1 = __SMUSD(coeff, R) >> 16; |
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| 556 | out2 = __SMUADX(coeff, R); |
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| 557 | |||
| 558 | #else |
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| 559 | |||
| 560 | out1 = __SMUADX(R, coeff) >> 16u; |
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| 561 | out2 = __SMUSD(__QSUB(0, coeff), R); |
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| 562 | |||
| 563 | #endif // #ifndef ARM_MATH_BIG_ENDIAN |
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| 564 | |||
| 565 | _SIMD32_OFFSET(pSrc + (2u * l)) = |
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| 566 | (q31_t) ((out2) & 0xFFFF0000) | (out1 & 0x0000FFFF); |
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| 567 | |||
| 568 | i += n1; |
||
| 569 | |||
| 570 | l = i + n2; |
||
| 571 | |||
| 572 | T = _SIMD32_OFFSET(pSrc + (2 * i)); |
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| 573 | |||
| 574 | S = _SIMD32_OFFSET(pSrc + (2 * l)); |
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| 575 | |||
| 576 | R = __QSUB16(T, S); |
||
| 577 | |||
| 578 | _SIMD32_OFFSET(pSrc + (2 * i)) = __SHADD16(T, S); |
||
| 579 | |||
| 580 | #ifndef ARM_MATH_BIG_ENDIAN |
||
| 581 | |||
| 582 | out1 = __SMUSD(coeff, R) >> 16; |
||
| 583 | out2 = __SMUADX(coeff, R); |
||
| 584 | #else |
||
| 585 | |||
| 586 | out1 = __SMUADX(R, coeff) >> 16u; |
||
| 587 | out2 = __SMUSD(__QSUB(0, coeff), R); |
||
| 588 | |||
| 589 | #endif // #ifndef ARM_MATH_BIG_ENDIAN |
||
| 590 | |||
| 591 | _SIMD32_OFFSET(pSrc + (2u * l)) = |
||
| 592 | (q31_t) ((out2) & 0xFFFF0000) | (out1 & 0x0000FFFF); |
||
| 593 | |||
| 594 | } // butterfly loop end |
||
| 595 | |||
| 596 | } // groups loop end |
||
| 597 | |||
| 598 | twidCoefModifier = twidCoefModifier << 1u; |
||
| 599 | } // stages loop end |
||
| 600 | |||
| 601 | n1 = n2; |
||
| 602 | n2 = n2 >> 1; |
||
| 603 | ia = 0; |
||
| 604 | |||
| 605 | // loop for groups |
||
| 606 | for (j = 0; j < n2; j++) |
||
| 607 | { |
||
| 608 | coeff = _SIMD32_OFFSET(pCoef + (ia * 2u)); |
||
| 609 | |||
| 610 | ia = ia + twidCoefModifier; |
||
| 611 | |||
| 612 | // loop for butterfly |
||
| 613 | for (i = j; i < fftLen; i += n1) |
||
| 614 | { |
||
| 615 | l = i + n2; |
||
| 616 | |||
| 617 | T = _SIMD32_OFFSET(pSrc + (2 * i)); |
||
| 618 | |||
| 619 | S = _SIMD32_OFFSET(pSrc + (2 * l)); |
||
| 620 | |||
| 621 | R = __QSUB16(T, S); |
||
| 622 | |||
| 623 | _SIMD32_OFFSET(pSrc + (2 * i)) = __QADD16(T, S); |
||
| 624 | |||
| 625 | _SIMD32_OFFSET(pSrc + (2u * l)) = R; |
||
| 626 | |||
| 627 | } // butterfly loop end |
||
| 628 | |||
| 629 | } // groups loop end |
||
| 630 | |||
| 631 | twidCoefModifier = twidCoefModifier << 1u; |
||
| 632 | |||
| 633 | #else |
||
| 634 | |||
| 635 | |||
| 636 | unsigned i, j, k, l; |
||
| 637 | unsigned n1, n2, ia; |
||
| 638 | q15_t xt, yt, cosVal, sinVal; |
||
| 639 | |||
| 640 | //N = fftLen; |
||
| 641 | n2 = fftLen; |
||
| 642 | |||
| 643 | n1 = n2; |
||
| 644 | n2 = n2 >> 1; |
||
| 645 | ia = 0; |
||
| 646 | |||
| 647 | // loop for groups |
||
| 648 | for (j = 0; j < n2; j++) |
||
| 649 | { |
||
| 650 | cosVal = pCoef[ia * 2]; |
||
| 651 | sinVal = pCoef[(ia * 2) + 1]; |
||
| 652 | ia = ia + twidCoefModifier; |
||
| 653 | |||
| 654 | // loop for butterfly |
||
| 655 | for (i = j; i < fftLen; i += n1) |
||
| 656 | { |
||
| 657 | l = i + n2; |
||
| 658 | xt = (pSrc[2 * i] >> 1u) - (pSrc[2 * l] >> 1u); |
||
| 659 | pSrc[2 * i] = ((pSrc[2 * i] >> 1u) + (pSrc[2 * l] >> 1u)) >> 1u; |
||
| 660 | |||
| 661 | yt = (pSrc[2 * i + 1] >> 1u) - (pSrc[2 * l + 1] >> 1u); |
||
| 662 | pSrc[2 * i + 1] = |
||
| 663 | ((pSrc[2 * l + 1] >> 1u) + (pSrc[2 * i + 1] >> 1u)) >> 1u; |
||
| 664 | |||
| 665 | pSrc[2u * l] = (((int16_t) (((q31_t) xt * cosVal) >> 16)) - |
||
| 666 | ((int16_t) (((q31_t) yt * sinVal) >> 16))); |
||
| 667 | |||
| 668 | pSrc[2u * l + 1u] = (((int16_t) (((q31_t) yt * cosVal) >> 16)) + |
||
| 669 | ((int16_t) (((q31_t) xt * sinVal) >> 16))); |
||
| 670 | |||
| 671 | } // butterfly loop end |
||
| 672 | |||
| 673 | } // groups loop end |
||
| 674 | |||
| 675 | twidCoefModifier = twidCoefModifier << 1u; |
||
| 676 | |||
| 677 | // loop for stage |
||
| 678 | for (k = fftLen / 2; k > 2; k = k >> 1) |
||
| 679 | { |
||
| 680 | n1 = n2; |
||
| 681 | n2 = n2 >> 1; |
||
| 682 | ia = 0; |
||
| 683 | |||
| 684 | // loop for groups |
||
| 685 | for (j = 0; j < n2; j++) |
||
| 686 | { |
||
| 687 | cosVal = pCoef[ia * 2]; |
||
| 688 | sinVal = pCoef[(ia * 2) + 1]; |
||
| 689 | ia = ia + twidCoefModifier; |
||
| 690 | |||
| 691 | // loop for butterfly |
||
| 692 | for (i = j; i < fftLen; i += n1) |
||
| 693 | { |
||
| 694 | l = i + n2; |
||
| 695 | xt = pSrc[2 * i] - pSrc[2 * l]; |
||
| 696 | pSrc[2 * i] = (pSrc[2 * i] + pSrc[2 * l]) >> 1u; |
||
| 697 | |||
| 698 | yt = pSrc[2 * i + 1] - pSrc[2 * l + 1]; |
||
| 699 | pSrc[2 * i + 1] = (pSrc[2 * l + 1] + pSrc[2 * i + 1]) >> 1u; |
||
| 700 | |||
| 701 | pSrc[2u * l] = (((int16_t) (((q31_t) xt * cosVal) >> 16)) - |
||
| 702 | ((int16_t) (((q31_t) yt * sinVal) >> 16))); |
||
| 703 | |||
| 704 | pSrc[2u * l + 1u] = (((int16_t) (((q31_t) yt * cosVal) >> 16)) + |
||
| 705 | ((int16_t) (((q31_t) xt * sinVal) >> 16))); |
||
| 706 | |||
| 707 | } // butterfly loop end |
||
| 708 | |||
| 709 | } // groups loop end |
||
| 710 | |||
| 711 | twidCoefModifier = twidCoefModifier << 1u; |
||
| 712 | } // stages loop end |
||
| 713 | |||
| 714 | n1 = n2; |
||
| 715 | n2 = n2 >> 1; |
||
| 716 | ia = 0; |
||
| 717 | |||
| 718 | cosVal = pCoef[ia * 2]; |
||
| 719 | sinVal = pCoef[(ia * 2) + 1]; |
||
| 720 | |||
| 721 | ia = ia + twidCoefModifier; |
||
| 722 | |||
| 723 | // loop for butterfly |
||
| 724 | for (i = 0; i < fftLen; i += n1) |
||
| 725 | { |
||
| 726 | l = i + n2; |
||
| 727 | xt = pSrc[2 * i] - pSrc[2 * l]; |
||
| 728 | pSrc[2 * i] = (pSrc[2 * i] + pSrc[2 * l]); |
||
| 729 | |||
| 730 | yt = pSrc[2 * i + 1] - pSrc[2 * l + 1]; |
||
| 731 | pSrc[2 * i + 1] = (pSrc[2 * l + 1] + pSrc[2 * i + 1]); |
||
| 732 | |||
| 733 | pSrc[2u * l] = xt; |
||
| 734 | |||
| 735 | pSrc[2u * l + 1u] = yt; |
||
| 736 | |||
| 737 | } // groups loop end |
||
| 738 | |||
| 739 | |||
| 740 | #endif // #ifndef ARM_MATH_CM0_FAMILY |
||
| 741 | |||
| 742 | } |