163 lines
4.3 KiB
C
163 lines
4.3 KiB
C
/* ----------------------------------------------------------------------
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* Project: CMSIS DSP Library
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* Title: arm_cmplx_mag_q15.c
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* Description: Q15 complex magnitude
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*
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* $Date: 18. March 2019
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* $Revision: V1.6.0
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*
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* Target Processor: Cortex-M cores
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* -------------------------------------------------------------------- */
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/*
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* Copyright (C) 2010-2019 ARM Limited or its affiliates. All rights reserved.
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the License); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an AS IS BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "arm_math.h"
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/**
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@ingroup groupCmplxMath
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*/
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/**
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@addtogroup cmplx_mag
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@{
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*/
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/**
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@brief Q15 complex magnitude.
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@param[in] pSrc points to input vector
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@param[out] pDst points to output vector
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@param[in] numSamples number of samples in each vector
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@return none
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@par Scaling and Overflow Behavior
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The function implements 1.15 by 1.15 multiplications and finally output is converted into 2.14 format.
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*/
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void arm_cmplx_mag_q15(
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const q15_t * pSrc,
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q15_t * pDst,
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uint32_t numSamples)
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{
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uint32_t blkCnt; /* Loop counter */
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#if defined (ARM_MATH_DSP)
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q31_t in;
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q31_t acc0; /* Accumulators */
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#else
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q15_t real, imag; /* Temporary input variables */
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q31_t acc0, acc1; /* Accumulators */
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#endif
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#if defined (ARM_MATH_LOOPUNROLL)
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/* Loop unrolling: Compute 4 outputs at a time */
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blkCnt = numSamples >> 2U;
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while (blkCnt > 0U)
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{
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/* C[0] = sqrt(A[0] * A[0] + A[1] * A[1]) */
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#if defined (ARM_MATH_DSP)
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in = read_q15x2_ia ((q15_t **) &pSrc);
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acc0 = __SMUAD(in, in);
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/* store result in 2.14 format in destination buffer. */
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arm_sqrt_q15((q15_t) (acc0 >> 17), pDst++);
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in = read_q15x2_ia ((q15_t **) &pSrc);
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acc0 = __SMUAD(in, in);
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arm_sqrt_q15((q15_t) (acc0 >> 17), pDst++);
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in = read_q15x2_ia ((q15_t **) &pSrc);
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acc0 = __SMUAD(in, in);
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arm_sqrt_q15((q15_t) (acc0 >> 17), pDst++);
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in = read_q15x2_ia ((q15_t **) &pSrc);
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acc0 = __SMUAD(in, in);
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arm_sqrt_q15((q15_t) (acc0 >> 17), pDst++);
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#else
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real = *pSrc++;
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imag = *pSrc++;
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acc0 = ((q31_t) real * real);
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acc1 = ((q31_t) imag * imag);
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/* store result in 2.14 format in destination buffer. */
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arm_sqrt_q15((q15_t) (((q63_t) acc0 + acc1) >> 17), pDst++);
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real = *pSrc++;
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imag = *pSrc++;
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acc0 = ((q31_t) real * real);
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acc1 = ((q31_t) imag * imag);
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arm_sqrt_q15((q15_t) (((q63_t) acc0 + acc1) >> 17), pDst++);
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real = *pSrc++;
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imag = *pSrc++;
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acc0 = ((q31_t) real * real);
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acc1 = ((q31_t) imag * imag);
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arm_sqrt_q15((q15_t) (((q63_t) acc0 + acc1) >> 17), pDst++);
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real = *pSrc++;
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imag = *pSrc++;
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acc0 = ((q31_t) real * real);
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acc1 = ((q31_t) imag * imag);
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arm_sqrt_q15((q15_t) (((q63_t) acc0 + acc1) >> 17), pDst++);
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#endif /* #if defined (ARM_MATH_DSP) */
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/* Decrement loop counter */
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blkCnt--;
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}
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/* Loop unrolling: Compute remaining outputs */
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blkCnt = numSamples % 0x4U;
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#else
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/* Initialize blkCnt with number of samples */
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blkCnt = numSamples;
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#endif /* #if defined (ARM_MATH_LOOPUNROLL) */
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while (blkCnt > 0U)
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{
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/* C[0] = sqrt(A[0] * A[0] + A[1] * A[1]) */
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#if defined (ARM_MATH_DSP)
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in = read_q15x2_ia ((q15_t **) &pSrc);
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acc0 = __SMUAD(in, in);
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/* store result in 2.14 format in destination buffer. */
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arm_sqrt_q15((q15_t) (acc0 >> 17), pDst++);
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#else
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real = *pSrc++;
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imag = *pSrc++;
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acc0 = ((q31_t) real * real);
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acc1 = ((q31_t) imag * imag);
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/* store result in 2.14 format in destination buffer. */
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arm_sqrt_q15((q15_t) (((q63_t) acc0 + acc1) >> 17), pDst++);
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#endif
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/* Decrement loop counter */
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blkCnt--;
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}
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}
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/**
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@} end of cmplx_mag group
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*/
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