mirror of
https://github.com/IcedRooibos/py32f0-template.git
synced 2025-10-31 01:42:04 -07:00
101 lines
2.8 KiB
C
101 lines
2.8 KiB
C
/* ----------------------------------------------------------------------
|
|
* Project: CMSIS DSP Library
|
|
* Title: arm_cmplx_mag_f64.c
|
|
* Description: Floating-point complex magnitude
|
|
*
|
|
* $Date: 13 September 2021
|
|
* $Revision: V1.10.0
|
|
*
|
|
* Target Processor: Cortex-M and Cortex-A cores
|
|
* -------------------------------------------------------------------- */
|
|
/*
|
|
* Copyright (C) 2010-2021 ARM Limited or its affiliates. All rights reserved.
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the License); you may
|
|
* not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an AS IS BASIS, WITHOUT
|
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
#include "dsp/complex_math_functions.h"
|
|
|
|
/**
|
|
@ingroup groupCmplxMath
|
|
*/
|
|
|
|
/**
|
|
@defgroup cmplx_mag Complex Magnitude
|
|
|
|
Computes the magnitude of the elements of a complex data vector.
|
|
|
|
The <code>pSrc</code> points to the source data and
|
|
<code>pDst</code> points to the where the result should be written.
|
|
<code>numSamples</code> specifies the number of complex samples
|
|
in the input array and the data is stored in an interleaved fashion
|
|
(real, imag, real, imag, ...).
|
|
The input array has a total of <code>2*numSamples</code> values;
|
|
the output array has a total of <code>numSamples</code> values.
|
|
|
|
The underlying algorithm is used:
|
|
|
|
<pre>
|
|
for (n = 0; n < numSamples; n++) {
|
|
pDst[n] = sqrt(pSrc[(2*n)+0]^2 + pSrc[(2*n)+1]^2);
|
|
}
|
|
</pre>
|
|
|
|
There are separate functions for floating-point, Q15, and Q31 data types.
|
|
*/
|
|
|
|
/**
|
|
@addtogroup cmplx_mag
|
|
@{
|
|
*/
|
|
|
|
/**
|
|
@brief Floating-point complex magnitude.
|
|
@param[in] pSrc points to input vector
|
|
@param[out] pDst points to output vector
|
|
@param[in] numSamples number of samples in each vector
|
|
@return none
|
|
*/
|
|
void arm_cmplx_mag_f64(
|
|
const float64_t * pSrc,
|
|
float64_t * pDst,
|
|
uint32_t numSamples)
|
|
{
|
|
uint32_t blkCnt; /* loop counter */
|
|
float64_t real, imag; /* Temporary variables to hold input values */
|
|
|
|
/* Initialize blkCnt with number of samples */
|
|
blkCnt = numSamples;
|
|
|
|
while (blkCnt > 0U)
|
|
{
|
|
/* C[0] = sqrt(A[0] * A[0] + A[1] * A[1]) */
|
|
|
|
real = *pSrc++;
|
|
imag = *pSrc++;
|
|
|
|
/* store result in destination buffer. */
|
|
*pDst++ = sqrt((real * real) + (imag * imag));
|
|
|
|
/* Decrement loop counter */
|
|
blkCnt--;
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
@} end of cmplx_mag group
|
|
*/
|