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