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-rw-r--r--DSP_Lib/Source/TransformFunctions/arm_cfft_radix2_q15.c742
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diff --git a/DSP_Lib/Source/TransformFunctions/arm_cfft_radix2_q15.c b/DSP_Lib/Source/TransformFunctions/arm_cfft_radix2_q15.c
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index 74d821a..0000000
--- a/DSP_Lib/Source/TransformFunctions/arm_cfft_radix2_q15.c
+++ /dev/null
@@ -1,742 +0,0 @@
-/* ----------------------------------------------------------------------
-* Copyright (C) 2010-2014 ARM Limited. All rights reserved.
-*
-* $Date: 19. March 2015
-* $Revision: V.1.4.5
-*
-* Project: CMSIS DSP Library
-* Title: arm_cfft_radix2_q15.c
-*
-* Description: Radix-2 Decimation in Frequency CFFT & CIFFT Fixed point processing function
-*
-*
-* Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
-*
-* Redistribution and use in source and binary forms, with or without
-* modification, are permitted provided that the following conditions
-* are met:
-* - Redistributions of source code must retain the above copyright
-* notice, this list of conditions and the following disclaimer.
-* - Redistributions in binary form must reproduce the above copyright
-* notice, this list of conditions and the following disclaimer in
-* the documentation and/or other materials provided with the
-* distribution.
-* - Neither the name of ARM LIMITED nor the names of its contributors
-* may be used to endorse or promote products derived from this
-* software without specific prior written permission.
-*
-* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
-* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
-* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
-* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
-* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
-* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
-* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
-* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
-* POSSIBILITY OF SUCH DAMAGE.
-* -------------------------------------------------------------------- */
-
-#include "arm_math.h"
-
-void arm_radix2_butterfly_q15(
- q15_t * pSrc,
- uint32_t fftLen,
- q15_t * pCoef,
- uint16_t twidCoefModifier);
-
-void arm_radix2_butterfly_inverse_q15(
- q15_t * pSrc,
- uint32_t fftLen,
- q15_t * pCoef,
- uint16_t twidCoefModifier);
-
-void arm_bitreversal_q15(
- q15_t * pSrc,
- uint32_t fftLen,
- uint16_t bitRevFactor,
- uint16_t * pBitRevTab);
-
-/**
- * @ingroup groupTransforms
- */
-
-/**
- * @addtogroup ComplexFFT
- * @{
- */
-
-/**
- * @details
- * @brief Processing function for the fixed-point CFFT/CIFFT.
- * @deprecated Do not use this function. It has been superseded by \ref arm_cfft_q15 and will be removed
- * @param[in] *S points to an instance of the fixed-point CFFT/CIFFT structure.
- * @param[in, out] *pSrc points to the complex data buffer of size <code>2*fftLen</code>. Processing occurs in-place.
- * @return none.
- */
-
-void arm_cfft_radix2_q15(
- const arm_cfft_radix2_instance_q15 * S,
- q15_t * pSrc)
-{
-
- if(S->ifftFlag == 1u)
- {
- arm_radix2_butterfly_inverse_q15(pSrc, S->fftLen,
- S->pTwiddle, S->twidCoefModifier);
- }
- else
- {
- arm_radix2_butterfly_q15(pSrc, S->fftLen,
- S->pTwiddle, S->twidCoefModifier);
- }
-
- arm_bitreversal_q15(pSrc, S->fftLen, S->bitRevFactor, S->pBitRevTable);
-}
-
-/**
- * @} end of ComplexFFT group
- */
-
-void arm_radix2_butterfly_q15(
- q15_t * pSrc,
- uint32_t fftLen,
- q15_t * pCoef,
- uint16_t twidCoefModifier)
-{
-#ifndef ARM_MATH_CM0_FAMILY
-
- unsigned i, j, k, l;
- unsigned n1, n2, ia;
- q15_t in;
- q31_t T, S, R;
- q31_t coeff, out1, out2;
-
- //N = fftLen;
- n2 = fftLen;
-
- n1 = n2;
- n2 = n2 >> 1;
- ia = 0;
-
- // loop for groups
- for (i = 0; i < n2; i++)
- {
- coeff = _SIMD32_OFFSET(pCoef + (ia * 2u));
-
- ia = ia + twidCoefModifier;
-
- l = i + n2;
-
- T = _SIMD32_OFFSET(pSrc + (2 * i));
- in = ((int16_t) (T & 0xFFFF)) >> 1;
- T = ((T >> 1) & 0xFFFF0000) | (in & 0xFFFF);
-
- S = _SIMD32_OFFSET(pSrc + (2 * l));
- in = ((int16_t) (S & 0xFFFF)) >> 1;
- S = ((S >> 1) & 0xFFFF0000) | (in & 0xFFFF);
-
- R = __QSUB16(T, S);
-
- _SIMD32_OFFSET(pSrc + (2 * i)) = __SHADD16(T, S);
-
-#ifndef ARM_MATH_BIG_ENDIAN
-
- out1 = __SMUAD(coeff, R) >> 16;
- out2 = __SMUSDX(coeff, R);
-
-#else
-
- out1 = __SMUSDX(R, coeff) >> 16u;
- out2 = __SMUAD(coeff, R);
-
-#endif // #ifndef ARM_MATH_BIG_ENDIAN
-
- _SIMD32_OFFSET(pSrc + (2u * l)) =
- (q31_t) ((out2) & 0xFFFF0000) | (out1 & 0x0000FFFF);
-
- coeff = _SIMD32_OFFSET(pCoef + (ia * 2u));
-
- ia = ia + twidCoefModifier;
-
- // loop for butterfly
- i++;
- l++;
-
- T = _SIMD32_OFFSET(pSrc + (2 * i));
- in = ((int16_t) (T & 0xFFFF)) >> 1;
- T = ((T >> 1) & 0xFFFF0000) | (in & 0xFFFF);
-
- S = _SIMD32_OFFSET(pSrc + (2 * l));
- in = ((int16_t) (S & 0xFFFF)) >> 1;
- S = ((S >> 1) & 0xFFFF0000) | (in & 0xFFFF);
-
- R = __QSUB16(T, S);
-
- _SIMD32_OFFSET(pSrc + (2 * i)) = __SHADD16(T, S);
-
-#ifndef ARM_MATH_BIG_ENDIAN
-
- out1 = __SMUAD(coeff, R) >> 16;
- out2 = __SMUSDX(coeff, R);
-
-#else
-
- out1 = __SMUSDX(R, coeff) >> 16u;
- out2 = __SMUAD(coeff, R);
-
-#endif // #ifndef ARM_MATH_BIG_ENDIAN
-
- _SIMD32_OFFSET(pSrc + (2u * l)) =
- (q31_t) ((out2) & 0xFFFF0000) | (out1 & 0x0000FFFF);
-
- } // groups loop end
-
- twidCoefModifier = twidCoefModifier << 1u;
-
- // loop for stage
- for (k = fftLen / 2; k > 2; k = k >> 1)
- {
- n1 = n2;
- n2 = n2 >> 1;
- ia = 0;
-
- // loop for groups
- for (j = 0; j < n2; j++)
- {
- coeff = _SIMD32_OFFSET(pCoef + (ia * 2u));
-
- ia = ia + twidCoefModifier;
-
- // loop for butterfly
- for (i = j; i < fftLen; i += n1)
- {
- l = i + n2;
-
- T = _SIMD32_OFFSET(pSrc + (2 * i));
-
- S = _SIMD32_OFFSET(pSrc + (2 * l));
-
- R = __QSUB16(T, S);
-
- _SIMD32_OFFSET(pSrc + (2 * i)) = __SHADD16(T, S);
-
-#ifndef ARM_MATH_BIG_ENDIAN
-
- out1 = __SMUAD(coeff, R) >> 16;
- out2 = __SMUSDX(coeff, R);
-
-#else
-
- out1 = __SMUSDX(R, coeff) >> 16u;
- out2 = __SMUAD(coeff, R);
-
-#endif // #ifndef ARM_MATH_BIG_ENDIAN
-
- _SIMD32_OFFSET(pSrc + (2u * l)) =
- (q31_t) ((out2) & 0xFFFF0000) | (out1 & 0x0000FFFF);
-
- i += n1;
-
- l = i + n2;
-
- T = _SIMD32_OFFSET(pSrc + (2 * i));
-
- S = _SIMD32_OFFSET(pSrc + (2 * l));
-
- R = __QSUB16(T, S);
-
- _SIMD32_OFFSET(pSrc + (2 * i)) = __SHADD16(T, S);
-
-#ifndef ARM_MATH_BIG_ENDIAN
-
- out1 = __SMUAD(coeff, R) >> 16;
- out2 = __SMUSDX(coeff, R);
-
-#else
-
- out1 = __SMUSDX(R, coeff) >> 16u;
- out2 = __SMUAD(coeff, R);
-
-#endif // #ifndef ARM_MATH_BIG_ENDIAN
-
- _SIMD32_OFFSET(pSrc + (2u * l)) =
- (q31_t) ((out2) & 0xFFFF0000) | (out1 & 0x0000FFFF);
-
- } // butterfly loop end
-
- } // groups loop end
-
- twidCoefModifier = twidCoefModifier << 1u;
- } // stages loop end
-
- n1 = n2;
- n2 = n2 >> 1;
- ia = 0;
-
- coeff = _SIMD32_OFFSET(pCoef + (ia * 2u));
-
- ia = ia + twidCoefModifier;
-
- // loop for butterfly
- for (i = 0; i < fftLen; i += n1)
- {
- l = i + n2;
-
- T = _SIMD32_OFFSET(pSrc + (2 * i));
-
- S = _SIMD32_OFFSET(pSrc + (2 * l));
-
- R = __QSUB16(T, S);
-
- _SIMD32_OFFSET(pSrc + (2 * i)) = __QADD16(T, S);
-
- _SIMD32_OFFSET(pSrc + (2u * l)) = R;
-
- i += n1;
- l = i + n2;
-
- T = _SIMD32_OFFSET(pSrc + (2 * i));
-
- S = _SIMD32_OFFSET(pSrc + (2 * l));
-
- R = __QSUB16(T, S);
-
- _SIMD32_OFFSET(pSrc + (2 * i)) = __QADD16(T, S);
-
- _SIMD32_OFFSET(pSrc + (2u * l)) = R;
-
- } // groups loop end
-
-
-#else
-
- unsigned i, j, k, l;
- unsigned n1, n2, ia;
- q15_t xt, yt, cosVal, sinVal;
-
-
- //N = fftLen;
- n2 = fftLen;
-
- n1 = n2;
- n2 = n2 >> 1;
- ia = 0;
-
- // loop for groups
- for (j = 0; j < n2; j++)
- {
- cosVal = pCoef[ia * 2];
- sinVal = pCoef[(ia * 2) + 1];
- ia = ia + twidCoefModifier;
-
- // loop for butterfly
- for (i = j; i < fftLen; i += n1)
- {
- l = i + n2;
- xt = (pSrc[2 * i] >> 1u) - (pSrc[2 * l] >> 1u);
- pSrc[2 * i] = ((pSrc[2 * i] >> 1u) + (pSrc[2 * l] >> 1u)) >> 1u;
-
- yt = (pSrc[2 * i + 1] >> 1u) - (pSrc[2 * l + 1] >> 1u);
- pSrc[2 * i + 1] =
- ((pSrc[2 * l + 1] >> 1u) + (pSrc[2 * i + 1] >> 1u)) >> 1u;
-
- pSrc[2u * l] = (((int16_t) (((q31_t) xt * cosVal) >> 16)) +
- ((int16_t) (((q31_t) yt * sinVal) >> 16)));
-
- pSrc[2u * l + 1u] = (((int16_t) (((q31_t) yt * cosVal) >> 16)) -
- ((int16_t) (((q31_t) xt * sinVal) >> 16)));
-
- } // butterfly loop end
-
- } // groups loop end
-
- twidCoefModifier = twidCoefModifier << 1u;
-
- // loop for stage
- for (k = fftLen / 2; k > 2; k = k >> 1)
- {
- n1 = n2;
- n2 = n2 >> 1;
- ia = 0;
-
- // loop for groups
- for (j = 0; j < n2; j++)
- {
- cosVal = pCoef[ia * 2];
- sinVal = pCoef[(ia * 2) + 1];
- ia = ia + twidCoefModifier;
-
- // loop for butterfly
- for (i = j; i < fftLen; i += n1)
- {
- l = i + n2;
- xt = pSrc[2 * i] - pSrc[2 * l];
- pSrc[2 * i] = (pSrc[2 * i] + pSrc[2 * l]) >> 1u;
-
- yt = pSrc[2 * i + 1] - pSrc[2 * l + 1];
- pSrc[2 * i + 1] = (pSrc[2 * l + 1] + pSrc[2 * i + 1]) >> 1u;
-
- pSrc[2u * l] = (((int16_t) (((q31_t) xt * cosVal) >> 16)) +
- ((int16_t) (((q31_t) yt * sinVal) >> 16)));
-
- pSrc[2u * l + 1u] = (((int16_t) (((q31_t) yt * cosVal) >> 16)) -
- ((int16_t) (((q31_t) xt * sinVal) >> 16)));
-
- } // butterfly loop end
-
- } // groups loop end
-
- twidCoefModifier = twidCoefModifier << 1u;
- } // stages loop end
-
- n1 = n2;
- n2 = n2 >> 1;
- ia = 0;
-
- // loop for groups
- for (j = 0; j < n2; j++)
- {
- cosVal = pCoef[ia * 2];
- sinVal = pCoef[(ia * 2) + 1];
-
- ia = ia + twidCoefModifier;
-
- // loop for butterfly
- for (i = j; i < fftLen; i += n1)
- {
- l = i + n2;
- xt = pSrc[2 * i] - pSrc[2 * l];
- pSrc[2 * i] = (pSrc[2 * i] + pSrc[2 * l]);
-
- yt = pSrc[2 * i + 1] - pSrc[2 * l + 1];
- pSrc[2 * i + 1] = (pSrc[2 * l + 1] + pSrc[2 * i + 1]);
-
- pSrc[2u * l] = xt;
-
- pSrc[2u * l + 1u] = yt;
-
- } // butterfly loop end
-
- } // groups loop end
-
- twidCoefModifier = twidCoefModifier << 1u;
-
-#endif // #ifndef ARM_MATH_CM0_FAMILY
-
-}
-
-
-void arm_radix2_butterfly_inverse_q15(
- q15_t * pSrc,
- uint32_t fftLen,
- q15_t * pCoef,
- uint16_t twidCoefModifier)
-{
-#ifndef ARM_MATH_CM0_FAMILY
-
- unsigned i, j, k, l;
- unsigned n1, n2, ia;
- q15_t in;
- q31_t T, S, R;
- q31_t coeff, out1, out2;
-
- //N = fftLen;
- n2 = fftLen;
-
- n1 = n2;
- n2 = n2 >> 1;
- ia = 0;
-
- // loop for groups
- for (i = 0; i < n2; i++)
- {
- coeff = _SIMD32_OFFSET(pCoef + (ia * 2u));
-
- ia = ia + twidCoefModifier;
-
- l = i + n2;
-
- T = _SIMD32_OFFSET(pSrc + (2 * i));
- in = ((int16_t) (T & 0xFFFF)) >> 1;
- T = ((T >> 1) & 0xFFFF0000) | (in & 0xFFFF);
-
- S = _SIMD32_OFFSET(pSrc + (2 * l));
- in = ((int16_t) (S & 0xFFFF)) >> 1;
- S = ((S >> 1) & 0xFFFF0000) | (in & 0xFFFF);
-
- R = __QSUB16(T, S);
-
- _SIMD32_OFFSET(pSrc + (2 * i)) = __SHADD16(T, S);
-
-#ifndef ARM_MATH_BIG_ENDIAN
-
- out1 = __SMUSD(coeff, R) >> 16;
- out2 = __SMUADX(coeff, R);
-#else
-
- out1 = __SMUADX(R, coeff) >> 16u;
- out2 = __SMUSD(__QSUB(0, coeff), R);
-
-#endif // #ifndef ARM_MATH_BIG_ENDIAN
-
- _SIMD32_OFFSET(pSrc + (2u * l)) =
- (q31_t) ((out2) & 0xFFFF0000) | (out1 & 0x0000FFFF);
-
- coeff = _SIMD32_OFFSET(pCoef + (ia * 2u));
-
- ia = ia + twidCoefModifier;
-
- // loop for butterfly
- i++;
- l++;
-
- T = _SIMD32_OFFSET(pSrc + (2 * i));
- in = ((int16_t) (T & 0xFFFF)) >> 1;
- T = ((T >> 1) & 0xFFFF0000) | (in & 0xFFFF);
-
- S = _SIMD32_OFFSET(pSrc + (2 * l));
- in = ((int16_t) (S & 0xFFFF)) >> 1;
- S = ((S >> 1) & 0xFFFF0000) | (in & 0xFFFF);
-
- R = __QSUB16(T, S);
-
- _SIMD32_OFFSET(pSrc + (2 * i)) = __SHADD16(T, S);
-
-#ifndef ARM_MATH_BIG_ENDIAN
-
- out1 = __SMUSD(coeff, R) >> 16;
- out2 = __SMUADX(coeff, R);
-#else
-
- out1 = __SMUADX(R, coeff) >> 16u;
- out2 = __SMUSD(__QSUB(0, coeff), R);
-
-#endif // #ifndef ARM_MATH_BIG_ENDIAN
-
- _SIMD32_OFFSET(pSrc + (2u * l)) =
- (q31_t) ((out2) & 0xFFFF0000) | (out1 & 0x0000FFFF);
-
- } // groups loop end
-
- twidCoefModifier = twidCoefModifier << 1u;
-
- // loop for stage
- for (k = fftLen / 2; k > 2; k = k >> 1)
- {
- n1 = n2;
- n2 = n2 >> 1;
- ia = 0;
-
- // loop for groups
- for (j = 0; j < n2; j++)
- {
- coeff = _SIMD32_OFFSET(pCoef + (ia * 2u));
-
- ia = ia + twidCoefModifier;
-
- // loop for butterfly
- for (i = j; i < fftLen; i += n1)
- {
- l = i + n2;
-
- T = _SIMD32_OFFSET(pSrc + (2 * i));
-
- S = _SIMD32_OFFSET(pSrc + (2 * l));
-
- R = __QSUB16(T, S);
-
- _SIMD32_OFFSET(pSrc + (2 * i)) = __SHADD16(T, S);
-
-#ifndef ARM_MATH_BIG_ENDIAN
-
- out1 = __SMUSD(coeff, R) >> 16;
- out2 = __SMUADX(coeff, R);
-
-#else
-
- out1 = __SMUADX(R, coeff) >> 16u;
- out2 = __SMUSD(__QSUB(0, coeff), R);
-
-#endif // #ifndef ARM_MATH_BIG_ENDIAN
-
- _SIMD32_OFFSET(pSrc + (2u * l)) =
- (q31_t) ((out2) & 0xFFFF0000) | (out1 & 0x0000FFFF);
-
- i += n1;
-
- l = i + n2;
-
- T = _SIMD32_OFFSET(pSrc + (2 * i));
-
- S = _SIMD32_OFFSET(pSrc + (2 * l));
-
- R = __QSUB16(T, S);
-
- _SIMD32_OFFSET(pSrc + (2 * i)) = __SHADD16(T, S);
-
-#ifndef ARM_MATH_BIG_ENDIAN
-
- out1 = __SMUSD(coeff, R) >> 16;
- out2 = __SMUADX(coeff, R);
-#else
-
- out1 = __SMUADX(R, coeff) >> 16u;
- out2 = __SMUSD(__QSUB(0, coeff), R);
-
-#endif // #ifndef ARM_MATH_BIG_ENDIAN
-
- _SIMD32_OFFSET(pSrc + (2u * l)) =
- (q31_t) ((out2) & 0xFFFF0000) | (out1 & 0x0000FFFF);
-
- } // butterfly loop end
-
- } // groups loop end
-
- twidCoefModifier = twidCoefModifier << 1u;
- } // stages loop end
-
- n1 = n2;
- n2 = n2 >> 1;
- ia = 0;
-
- // loop for groups
- for (j = 0; j < n2; j++)
- {
- coeff = _SIMD32_OFFSET(pCoef + (ia * 2u));
-
- ia = ia + twidCoefModifier;
-
- // loop for butterfly
- for (i = j; i < fftLen; i += n1)
- {
- l = i + n2;
-
- T = _SIMD32_OFFSET(pSrc + (2 * i));
-
- S = _SIMD32_OFFSET(pSrc + (2 * l));
-
- R = __QSUB16(T, S);
-
- _SIMD32_OFFSET(pSrc + (2 * i)) = __QADD16(T, S);
-
- _SIMD32_OFFSET(pSrc + (2u * l)) = R;
-
- } // butterfly loop end
-
- } // groups loop end
-
- twidCoefModifier = twidCoefModifier << 1u;
-
-#else
-
-
- unsigned i, j, k, l;
- unsigned n1, n2, ia;
- q15_t xt, yt, cosVal, sinVal;
-
- //N = fftLen;
- n2 = fftLen;
-
- n1 = n2;
- n2 = n2 >> 1;
- ia = 0;
-
- // loop for groups
- for (j = 0; j < n2; j++)
- {
- cosVal = pCoef[ia * 2];
- sinVal = pCoef[(ia * 2) + 1];
- ia = ia + twidCoefModifier;
-
- // loop for butterfly
- for (i = j; i < fftLen; i += n1)
- {
- l = i + n2;
- xt = (pSrc[2 * i] >> 1u) - (pSrc[2 * l] >> 1u);
- pSrc[2 * i] = ((pSrc[2 * i] >> 1u) + (pSrc[2 * l] >> 1u)) >> 1u;
-
- yt = (pSrc[2 * i + 1] >> 1u) - (pSrc[2 * l + 1] >> 1u);
- pSrc[2 * i + 1] =
- ((pSrc[2 * l + 1] >> 1u) + (pSrc[2 * i + 1] >> 1u)) >> 1u;
-
- pSrc[2u * l] = (((int16_t) (((q31_t) xt * cosVal) >> 16)) -
- ((int16_t) (((q31_t) yt * sinVal) >> 16)));
-
- pSrc[2u * l + 1u] = (((int16_t) (((q31_t) yt * cosVal) >> 16)) +
- ((int16_t) (((q31_t) xt * sinVal) >> 16)));
-
- } // butterfly loop end
-
- } // groups loop end
-
- twidCoefModifier = twidCoefModifier << 1u;
-
- // loop for stage
- for (k = fftLen / 2; k > 2; k = k >> 1)
- {
- n1 = n2;
- n2 = n2 >> 1;
- ia = 0;
-
- // loop for groups
- for (j = 0; j < n2; j++)
- {
- cosVal = pCoef[ia * 2];
- sinVal = pCoef[(ia * 2) + 1];
- ia = ia + twidCoefModifier;
-
- // loop for butterfly
- for (i = j; i < fftLen; i += n1)
- {
- l = i + n2;
- xt = pSrc[2 * i] - pSrc[2 * l];
- pSrc[2 * i] = (pSrc[2 * i] + pSrc[2 * l]) >> 1u;
-
- yt = pSrc[2 * i + 1] - pSrc[2 * l + 1];
- pSrc[2 * i + 1] = (pSrc[2 * l + 1] + pSrc[2 * i + 1]) >> 1u;
-
- pSrc[2u * l] = (((int16_t) (((q31_t) xt * cosVal) >> 16)) -
- ((int16_t) (((q31_t) yt * sinVal) >> 16)));
-
- pSrc[2u * l + 1u] = (((int16_t) (((q31_t) yt * cosVal) >> 16)) +
- ((int16_t) (((q31_t) xt * sinVal) >> 16)));
-
- } // butterfly loop end
-
- } // groups loop end
-
- twidCoefModifier = twidCoefModifier << 1u;
- } // stages loop end
-
- n1 = n2;
- n2 = n2 >> 1;
- ia = 0;
-
- cosVal = pCoef[ia * 2];
- sinVal = pCoef[(ia * 2) + 1];
-
- ia = ia + twidCoefModifier;
-
- // loop for butterfly
- for (i = 0; i < fftLen; i += n1)
- {
- l = i + n2;
- xt = pSrc[2 * i] - pSrc[2 * l];
- pSrc[2 * i] = (pSrc[2 * i] + pSrc[2 * l]);
-
- yt = pSrc[2 * i + 1] - pSrc[2 * l + 1];
- pSrc[2 * i + 1] = (pSrc[2 * l + 1] + pSrc[2 * i + 1]);
-
- pSrc[2u * l] = xt;
-
- pSrc[2u * l + 1u] = yt;
-
- } // groups loop end
-
-
-#endif // #ifndef ARM_MATH_CM0_FAMILY
-
-}
generated by cgit (git 2.34.1) at 2024-09-16 06:54:22 +0000