1  /* ----------------------------------------------------------------------
 2   * Project:      CMSIS DSP Library
 3   * Title:        arm_cmplx_mag_squared_f64.c
 4   * Description:  Floating-point complex magnitude squared
 5   *
 6   * $Date:        13 September 2021
 7   * $Revision:    V1.10.0
 8   *
 9   * Target Processor: Cortex-M and Cortex-A cores
10   * -------------------------------------------------------------------- */
11  /*
12   * Copyright (C) 2010-2021 ARM Limited or its affiliates. All rights reserved.
13   *
14   * SPDX-License-Identifier: Apache-2.0
15   *
16   * Licensed under the Apache License, Version 2.0 (the License); you may
17   * not use this file except in compliance with the License.
18   * You may obtain a copy of the License at
19   *
20   * www.apache.org/licenses/LICENSE-2.0
21   *
22   * Unless required by applicable law or agreed to in writing, software
23   * distributed under the License is distributed on an AS IS BASIS, WITHOUT
24   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
25   * See the License for the specific language governing permissions and
26   * limitations under the License.
27   */
28  
29  #include "dsp/complex_math_functions.h"
30  
31  /**
32    @ingroup groupCmplxMath
33   */
34  
35  /**
36    @addtogroup cmplx_mag_squared
37    @{
38   */
39  
40  /**
41    @brief         Floating-point complex magnitude squared.
42    @param[in]     pSrc        points to input vector
43    @param[out]    pDst        points to output vector
44    @param[in]     numSamples  number of samples in each vector
45    @return        none
46   */
47  void arm_cmplx_mag_squared_f64(
48    const float64_t * pSrc,
49          float64_t * pDst,
50          uint32_t numSamples)
51  {
52          uint32_t blkCnt;                               /* Loop counter */
53          float64_t real, imag;                          /* Temporary input variables */
54  
55    /* Initialize blkCnt with number of samples */
56    blkCnt = numSamples;
57  
58    while (blkCnt > 0U)
59    {
60      /* C[0] = (A[0] * A[0] + A[1] * A[1]) */
61  
62      real = *pSrc++;
63      imag = *pSrc++;
64  
65      /* store result in destination buffer. */
66      *pDst++ = (real * real) + (imag * imag);
67  
68      /* Decrement loop counter */
69      blkCnt--;
70    }
71  
72  }
73  
74  /**
75    @} end of cmplx_mag_squared group
76   */