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CMSIS DSP library

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cmsis_dsp/ComplexMathFunctions/arm_cmplx_mag_f32.c@5:3762170b6d4d, 2015-11-20 (annotated)

Committer:
mbed_official
Date:
Fri Nov 20 08:45:18 2015 +0000
Revision:
5:3762170b6d4d
Parent:
3:7a284390b0ce 
Synchronized with git revision 2eb940b9a73af188d3004a2575fdfbb05febe62b



Full URL: https://github.com/mbedmicro/mbed/commit/2eb940b9a73af188d3004a2575fdfbb05febe62b/



Added option to build rpc library. closes #1426

Who changed what in which revision?

UserRevisionLine numberNew contents of line
emilmont 1:fdd22bb7aa52 1 /* ----------------------------------------------------------------------
mbed_official 5:3762170b6d4d 2 * Copyright (C) 2010-2014 ARM Limited. All rights reserved.
emilmont 1:fdd22bb7aa52 3 *
mbed_official 5:3762170b6d4d 4 * $Date: 19. March 2015
mbed_official 5:3762170b6d4d 5 * $Revision: V.1.4.5
emilmont 1:fdd22bb7aa52 6 *
emilmont 2:da51fb522205 7 * Project: CMSIS DSP Library
emilmont 2:da51fb522205 8 * Title: arm_cmplx_mag_f32.c
emilmont 1:fdd22bb7aa52 9 *
emilmont 2:da51fb522205 10 * Description: Floating-point complex magnitude.
emilmont 1:fdd22bb7aa52 11 *
emilmont 1:fdd22bb7aa52 12 * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
emilmont 1:fdd22bb7aa52 13 *
mbed_official 3:7a284390b0ce 14 * Redistribution and use in source and binary forms, with or without
mbed_official 3:7a284390b0ce 15 * modification, are permitted provided that the following conditions
mbed_official 3:7a284390b0ce 16 * are met:
mbed_official 3:7a284390b0ce 17 * - Redistributions of source code must retain the above copyright
mbed_official 3:7a284390b0ce 18 * notice, this list of conditions and the following disclaimer.
mbed_official 3:7a284390b0ce 19 * - Redistributions in binary form must reproduce the above copyright
mbed_official 3:7a284390b0ce 20 * notice, this list of conditions and the following disclaimer in
mbed_official 3:7a284390b0ce 21 * the documentation and/or other materials provided with the
mbed_official 3:7a284390b0ce 22 * distribution.
mbed_official 3:7a284390b0ce 23 * - Neither the name of ARM LIMITED nor the names of its contributors
mbed_official 3:7a284390b0ce 24 * may be used to endorse or promote products derived from this
mbed_official 3:7a284390b0ce 25 * software without specific prior written permission.
mbed_official 3:7a284390b0ce 26 *
mbed_official 3:7a284390b0ce 27 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
mbed_official 3:7a284390b0ce 28 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
mbed_official 3:7a284390b0ce 29 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
mbed_official 3:7a284390b0ce 30 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
mbed_official 3:7a284390b0ce 31 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
mbed_official 3:7a284390b0ce 32 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
mbed_official 3:7a284390b0ce 33 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
mbed_official 3:7a284390b0ce 34 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 3:7a284390b0ce 35 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
mbed_official 3:7a284390b0ce 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
mbed_official 3:7a284390b0ce 37 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
mbed_official 3:7a284390b0ce 38 * POSSIBILITY OF SUCH DAMAGE.
emilmont 1:fdd22bb7aa52 39 * ---------------------------------------------------------------------------- */
emilmont 1:fdd22bb7aa52 40
emilmont 1:fdd22bb7aa52 41 #include "arm_math.h"
emilmont 1:fdd22bb7aa52 42
emilmont 1:fdd22bb7aa52 43 /**
emilmont 1:fdd22bb7aa52 44 * @ingroup groupCmplxMath
emilmont 1:fdd22bb7aa52 45 */
emilmont 1:fdd22bb7aa52 46
emilmont 1:fdd22bb7aa52 47 /**
emilmont 1:fdd22bb7aa52 48 * @defgroup cmplx_mag Complex Magnitude
emilmont 1:fdd22bb7aa52 49 *
emilmont 1:fdd22bb7aa52 50 * Computes the magnitude of the elements of a complex data vector.
emilmont 1:fdd22bb7aa52 51 *
emilmont 1:fdd22bb7aa52 52 * The <code>pSrc</code> points to the source data and
emilmont 1:fdd22bb7aa52 53 * <code>pDst</code> points to the where the result should be written.
emilmont 1:fdd22bb7aa52 54 * <code>numSamples</code> specifies the number of complex samples
emilmont 1:fdd22bb7aa52 55 * in the input array and the data is stored in an interleaved fashion
emilmont 1:fdd22bb7aa52 56 * (real, imag, real, imag, ...).
emilmont 1:fdd22bb7aa52 57 * The input array has a total of <code>2*numSamples</code> values;
emilmont 1:fdd22bb7aa52 58 * the output array has a total of <code>numSamples</code> values.
emilmont 1:fdd22bb7aa52 59 * The underlying algorithm is used:
emilmont 1:fdd22bb7aa52 60 *
emilmont 1:fdd22bb7aa52 61 * <pre>
emilmont 1:fdd22bb7aa52 62 * for(n=0; n<numSamples; n++) {
emilmont 1:fdd22bb7aa52 63 * pDst[n] = sqrt(pSrc[(2*n)+0]^2 + pSrc[(2*n)+1]^2);
emilmont 1:fdd22bb7aa52 64 * }
emilmont 1:fdd22bb7aa52 65 * </pre>
emilmont 1:fdd22bb7aa52 66 *
emilmont 1:fdd22bb7aa52 67 * There are separate functions for floating-point, Q15, and Q31 data types.
emilmont 1:fdd22bb7aa52 68 */
emilmont 1:fdd22bb7aa52 69
emilmont 1:fdd22bb7aa52 70 /**
emilmont 1:fdd22bb7aa52 71 * @addtogroup cmplx_mag
emilmont 1:fdd22bb7aa52 72 * @{
emilmont 1:fdd22bb7aa52 73 */
emilmont 1:fdd22bb7aa52 74 /**
emilmont 1:fdd22bb7aa52 75 * @brief Floating-point complex magnitude.
emilmont 1:fdd22bb7aa52 76 * @param[in] *pSrc points to complex input buffer
emilmont 1:fdd22bb7aa52 77 * @param[out] *pDst points to real output buffer
emilmont 1:fdd22bb7aa52 78 * @param[in] numSamples number of complex samples in the input vector
emilmont 1:fdd22bb7aa52 79 * @return none.
emilmont 1:fdd22bb7aa52 80 *
emilmont 1:fdd22bb7aa52 81 */
emilmont 1:fdd22bb7aa52 82
emilmont 1:fdd22bb7aa52 83
emilmont 1:fdd22bb7aa52 84 void arm_cmplx_mag_f32(
emilmont 1:fdd22bb7aa52 85 float32_t * pSrc,
emilmont 1:fdd22bb7aa52 86 float32_t * pDst,
emilmont 1:fdd22bb7aa52 87 uint32_t numSamples)
emilmont 1:fdd22bb7aa52 88 {
emilmont 1:fdd22bb7aa52 89 float32_t realIn, imagIn; /* Temporary variables to hold input values */
emilmont 1:fdd22bb7aa52 90
mbed_official 3:7a284390b0ce 91 #ifndef ARM_MATH_CM0_FAMILY
emilmont 1:fdd22bb7aa52 92
emilmont 1:fdd22bb7aa52 93 /* Run the below code for Cortex-M4 and Cortex-M3 */
emilmont 1:fdd22bb7aa52 94 uint32_t blkCnt; /* loop counter */
emilmont 1:fdd22bb7aa52 95
emilmont 1:fdd22bb7aa52 96 /*loop Unrolling */
emilmont 1:fdd22bb7aa52 97 blkCnt = numSamples >> 2u;
emilmont 1:fdd22bb7aa52 98
emilmont 1:fdd22bb7aa52 99 /* First part of the processing with loop unrolling. Compute 4 outputs at a time.
emilmont 1:fdd22bb7aa52 100 ** a second loop below computes the remaining 1 to 3 samples. */
emilmont 1:fdd22bb7aa52 101 while(blkCnt > 0u)
emilmont 1:fdd22bb7aa52 102 {
emilmont 1:fdd22bb7aa52 103
emilmont 1:fdd22bb7aa52 104 /* C[0] = sqrt(A[0] * A[0] + A[1] * A[1]) */
emilmont 1:fdd22bb7aa52 105 realIn = *pSrc++;
emilmont 1:fdd22bb7aa52 106 imagIn = *pSrc++;
emilmont 1:fdd22bb7aa52 107 /* store the result in the destination buffer. */
emilmont 1:fdd22bb7aa52 108 arm_sqrt_f32((realIn * realIn) + (imagIn * imagIn), pDst++);
emilmont 1:fdd22bb7aa52 109
emilmont 1:fdd22bb7aa52 110 realIn = *pSrc++;
emilmont 1:fdd22bb7aa52 111 imagIn = *pSrc++;
emilmont 1:fdd22bb7aa52 112 arm_sqrt_f32((realIn * realIn) + (imagIn * imagIn), pDst++);
emilmont 1:fdd22bb7aa52 113
emilmont 1:fdd22bb7aa52 114 realIn = *pSrc++;
emilmont 1:fdd22bb7aa52 115 imagIn = *pSrc++;
emilmont 1:fdd22bb7aa52 116 arm_sqrt_f32((realIn * realIn) + (imagIn * imagIn), pDst++);
emilmont 1:fdd22bb7aa52 117
emilmont 1:fdd22bb7aa52 118 realIn = *pSrc++;
emilmont 1:fdd22bb7aa52 119 imagIn = *pSrc++;
emilmont 1:fdd22bb7aa52 120 arm_sqrt_f32((realIn * realIn) + (imagIn * imagIn), pDst++);
emilmont 1:fdd22bb7aa52 121
emilmont 1:fdd22bb7aa52 122
emilmont 1:fdd22bb7aa52 123 /* Decrement the loop counter */
emilmont 1:fdd22bb7aa52 124 blkCnt--;
emilmont 1:fdd22bb7aa52 125 }
emilmont 1:fdd22bb7aa52 126
emilmont 1:fdd22bb7aa52 127 /* If the numSamples is not a multiple of 4, compute any remaining output samples here.
emilmont 1:fdd22bb7aa52 128 ** No loop unrolling is used. */
emilmont 1:fdd22bb7aa52 129 blkCnt = numSamples % 0x4u;
emilmont 1:fdd22bb7aa52 130
emilmont 1:fdd22bb7aa52 131 while(blkCnt > 0u)
emilmont 1:fdd22bb7aa52 132 {
emilmont 1:fdd22bb7aa52 133 /* C[0] = sqrt(A[0] * A[0] + A[1] * A[1]) */
emilmont 1:fdd22bb7aa52 134 realIn = *pSrc++;
emilmont 1:fdd22bb7aa52 135 imagIn = *pSrc++;
emilmont 1:fdd22bb7aa52 136 /* store the result in the destination buffer. */
emilmont 1:fdd22bb7aa52 137 arm_sqrt_f32((realIn * realIn) + (imagIn * imagIn), pDst++);
emilmont 1:fdd22bb7aa52 138
emilmont 1:fdd22bb7aa52 139 /* Decrement the loop counter */
emilmont 1:fdd22bb7aa52 140 blkCnt--;
emilmont 1:fdd22bb7aa52 141 }
emilmont 1:fdd22bb7aa52 142
emilmont 1:fdd22bb7aa52 143 #else
emilmont 1:fdd22bb7aa52 144
emilmont 1:fdd22bb7aa52 145 /* Run the below code for Cortex-M0 */
emilmont 1:fdd22bb7aa52 146
emilmont 1:fdd22bb7aa52 147 while(numSamples > 0u)
emilmont 1:fdd22bb7aa52 148 {
emilmont 1:fdd22bb7aa52 149 /* out = sqrt((real * real) + (imag * imag)) */
emilmont 1:fdd22bb7aa52 150 realIn = *pSrc++;
emilmont 1:fdd22bb7aa52 151 imagIn = *pSrc++;
emilmont 1:fdd22bb7aa52 152 /* store the result in the destination buffer. */
emilmont 1:fdd22bb7aa52 153 arm_sqrt_f32((realIn * realIn) + (imagIn * imagIn), pDst++);
emilmont 1:fdd22bb7aa52 154
emilmont 1:fdd22bb7aa52 155 /* Decrement the loop counter */
emilmont 1:fdd22bb7aa52 156 numSamples--;
emilmont 1:fdd22bb7aa52 157 }
emilmont 1:fdd22bb7aa52 158
mbed_official 3:7a284390b0ce 159 #endif /* #ifndef ARM_MATH_CM0_FAMILY */
emilmont 1:fdd22bb7aa52 160
emilmont 1:fdd22bb7aa52 161 }
emilmont 1:fdd22bb7aa52 162
emilmont 1:fdd22bb7aa52 163 /**
emilmont 1:fdd22bb7aa52 164 * @} end of cmplx_mag group
emilmont 1:fdd22bb7aa52 165 */