174 lines
4.7 KiB
C
174 lines
4.7 KiB
C
/* ----------------------------------------------------------------------
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* Project: CMSIS DSP Library
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* Title: arm_cmplx_mag_q31.c
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* Description: Q31 complex magnitude
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*
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* $Date: 27. January 2017
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* $Revision: V.1.5.1
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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) 2010-2017 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 Q31 complex magnitude
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* @param *pSrc points to the complex input vector
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* @param *pDst points to the real output vector
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* @param numSamples number of complex samples in the input vector
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* @return none.
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*
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* <b>Scaling and Overflow Behavior:</b>
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* \par
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* The function implements 1.31 by 1.31 multiplications and finally output is converted into 2.30 format.
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* Input down scaling is not required.
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*/
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void arm_cmplx_mag_q31(
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q31_t * pSrc,
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q31_t * pDst,
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uint32_t numSamples)
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{
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q31_t real, imag; /* Temporary variables to hold input values */
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q31_t acc0, acc1; /* Accumulators */
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uint32_t blkCnt; /* loop counter */
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#if defined (ARM_MATH_DSP)
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/* Run the below code for Cortex-M4 and Cortex-M3 */
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q31_t real1, real2, imag1, imag2; /* Temporary variables to hold input values */
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q31_t out1, out2, out3, out4; /* Accumulators */
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q63_t mul1, mul2, mul3, mul4; /* Temporary variables */
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/*loop Unrolling */
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blkCnt = numSamples >> 2U;
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/* First part of the processing with loop unrolling. Compute 4 outputs at a time.
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** a second loop below computes the remaining 1 to 3 samples. */
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while (blkCnt > 0U)
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{
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/* read complex input from source buffer */
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real1 = pSrc[0];
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imag1 = pSrc[1];
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real2 = pSrc[2];
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imag2 = pSrc[3];
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/* calculate power of input values */
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mul1 = (q63_t) real1 *real1;
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mul2 = (q63_t) imag1 *imag1;
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mul3 = (q63_t) real2 *real2;
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mul4 = (q63_t) imag2 *imag2;
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/* get the result to 3.29 format */
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out1 = (q31_t) (mul1 >> 33);
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out2 = (q31_t) (mul2 >> 33);
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out3 = (q31_t) (mul3 >> 33);
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out4 = (q31_t) (mul4 >> 33);
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/* add real and imaginary accumulators */
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out1 = out1 + out2;
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out3 = out3 + out4;
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/* read complex input from source buffer */
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real1 = pSrc[4];
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imag1 = pSrc[5];
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real2 = pSrc[6];
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imag2 = pSrc[7];
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/* calculate square root */
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arm_sqrt_q31(out1, &pDst[0]);
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/* calculate power of input values */
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mul1 = (q63_t) real1 *real1;
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/* calculate square root */
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arm_sqrt_q31(out3, &pDst[1]);
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/* calculate power of input values */
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mul2 = (q63_t) imag1 *imag1;
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mul3 = (q63_t) real2 *real2;
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mul4 = (q63_t) imag2 *imag2;
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/* get the result to 3.29 format */
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out1 = (q31_t) (mul1 >> 33);
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out2 = (q31_t) (mul2 >> 33);
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out3 = (q31_t) (mul3 >> 33);
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out4 = (q31_t) (mul4 >> 33);
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/* add real and imaginary accumulators */
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out1 = out1 + out2;
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out3 = out3 + out4;
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/* calculate square root */
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arm_sqrt_q31(out1, &pDst[2]);
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/* increment destination by 8 to process next samples */
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pSrc += 8U;
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/* calculate square root */
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arm_sqrt_q31(out3, &pDst[3]);
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/* increment destination by 4 to process next samples */
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pDst += 4U;
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/* Decrement the loop counter */
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blkCnt--;
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}
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/* If the numSamples is not a multiple of 4, compute any remaining output samples here.
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** No loop unrolling is used. */
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blkCnt = numSamples % 0x4U;
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#else
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/* Run the below code for Cortex-M0 */
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blkCnt = numSamples;
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#endif /* #if defined (ARM_MATH_DSP) */
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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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real = *pSrc++;
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imag = *pSrc++;
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acc0 = (q31_t) (((q63_t) real * real) >> 33);
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acc1 = (q31_t) (((q63_t) imag * imag) >> 33);
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/* store the result in 2.30 format in the destination buffer. */
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arm_sqrt_q31(acc0 + acc1, pDst++);
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/* Decrement the 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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