Eli Hughes / CMSIS_DSP_401

V4.0.1 of the ARM CMSIS DSP libraries. Note that arm_bitreversal2.s, arm_cfft_f32.c and arm_rfft_fast_f32.c had to be removed. arm_bitreversal2.s will not assemble with the online tools. So, the fast f32 FFT functions are not yet available. All the other FFT functions are available.

Dependents:   MPU9150_Example fir_f32 fir_f32 MPU9150_nucleo_noni2cdev ... more

ComplexMathFunctions/arm_cmplx_mag_squared_f32.c@0:3d9c67d97d6f, 2014-07-28 (annotated)

Committer:
emh203
Date:
Mon Jul 28 15:03:15 2014 +0000
Revision:
0:3d9c67d97d6f
1st working commit.   Had to remove arm_bitreversal2.s     arm_cfft_f32.c and arm_rfft_fast_f32.c.    The .s will not assemble.      For now I removed these functions so we could at least have a library for the other functions.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
emh203 0:3d9c67d97d6f 1 /* ----------------------------------------------------------------------
emh203 0:3d9c67d97d6f 2 * Copyright (C) 2010-2014 ARM Limited. All rights reserved.
emh203 0:3d9c67d97d6f 3 *
emh203 0:3d9c67d97d6f 4 * $Date: 12. March 2014
emh203 0:3d9c67d97d6f 5 * $Revision: V1.4.3
emh203 0:3d9c67d97d6f 6 *
emh203 0:3d9c67d97d6f 7 * Project: CMSIS DSP Library
emh203 0:3d9c67d97d6f 8 * Title: arm_cmplx_mag_squared_f32.c
emh203 0:3d9c67d97d6f 9 *
emh203 0:3d9c67d97d6f 10 * Description: Floating-point complex magnitude squared.
emh203 0:3d9c67d97d6f 11 *
emh203 0:3d9c67d97d6f 12 * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
emh203 0:3d9c67d97d6f 13 *
emh203 0:3d9c67d97d6f 14 * Redistribution and use in source and binary forms, with or without
emh203 0:3d9c67d97d6f 15 * modification, are permitted provided that the following conditions
emh203 0:3d9c67d97d6f 16 * are met:
emh203 0:3d9c67d97d6f 17 * - Redistributions of source code must retain the above copyright
emh203 0:3d9c67d97d6f 18 * notice, this list of conditions and the following disclaimer.
emh203 0:3d9c67d97d6f 19 * - Redistributions in binary form must reproduce the above copyright
emh203 0:3d9c67d97d6f 20 * notice, this list of conditions and the following disclaimer in
emh203 0:3d9c67d97d6f 21 * the documentation and/or other materials provided with the
emh203 0:3d9c67d97d6f 22 * distribution.
emh203 0:3d9c67d97d6f 23 * - Neither the name of ARM LIMITED nor the names of its contributors
emh203 0:3d9c67d97d6f 24 * may be used to endorse or promote products derived from this
emh203 0:3d9c67d97d6f 25 * software without specific prior written permission.
emh203 0:3d9c67d97d6f 26 *
emh203 0:3d9c67d97d6f 27 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
emh203 0:3d9c67d97d6f 28 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
emh203 0:3d9c67d97d6f 29 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
emh203 0:3d9c67d97d6f 30 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
emh203 0:3d9c67d97d6f 31 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
emh203 0:3d9c67d97d6f 32 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
emh203 0:3d9c67d97d6f 33 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
emh203 0:3d9c67d97d6f 34 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
emh203 0:3d9c67d97d6f 35 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
emh203 0:3d9c67d97d6f 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
emh203 0:3d9c67d97d6f 37 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
emh203 0:3d9c67d97d6f 38 * POSSIBILITY OF SUCH DAMAGE.
emh203 0:3d9c67d97d6f 39 * ---------------------------------------------------------------------------- */
emh203 0:3d9c67d97d6f 40 #include "arm_math.h"
emh203 0:3d9c67d97d6f 41
emh203 0:3d9c67d97d6f 42 /**
emh203 0:3d9c67d97d6f 43 * @ingroup groupCmplxMath
emh203 0:3d9c67d97d6f 44 */
emh203 0:3d9c67d97d6f 45
emh203 0:3d9c67d97d6f 46 /**
emh203 0:3d9c67d97d6f 47 * @defgroup cmplx_mag_squared Complex Magnitude Squared
emh203 0:3d9c67d97d6f 48 *
emh203 0:3d9c67d97d6f 49 * Computes the magnitude squared of the elements of a complex data vector.
emh203 0:3d9c67d97d6f 50 *
emh203 0:3d9c67d97d6f 51 * The <code>pSrc</code> points to the source data and
emh203 0:3d9c67d97d6f 52 * <code>pDst</code> points to the where the result should be written.
emh203 0:3d9c67d97d6f 53 * <code>numSamples</code> specifies the number of complex samples
emh203 0:3d9c67d97d6f 54 * in the input array and the data is stored in an interleaved fashion
emh203 0:3d9c67d97d6f 55 * (real, imag, real, imag, ...).
emh203 0:3d9c67d97d6f 56 * The input array has a total of <code>2*numSamples</code> values;
emh203 0:3d9c67d97d6f 57 * the output array has a total of <code>numSamples</code> values.
emh203 0:3d9c67d97d6f 58 *
emh203 0:3d9c67d97d6f 59 * The underlying algorithm is used:
emh203 0:3d9c67d97d6f 60 *
emh203 0:3d9c67d97d6f 61 * <pre>
emh203 0:3d9c67d97d6f 62 * for(n=0; n<numSamples; n++) {
emh203 0:3d9c67d97d6f 63 * pDst[n] = pSrc[(2*n)+0]^2 + pSrc[(2*n)+1]^2;
emh203 0:3d9c67d97d6f 64 * }
emh203 0:3d9c67d97d6f 65 * </pre>
emh203 0:3d9c67d97d6f 66 *
emh203 0:3d9c67d97d6f 67 * There are separate functions for floating-point, Q15, and Q31 data types.
emh203 0:3d9c67d97d6f 68 */
emh203 0:3d9c67d97d6f 69
emh203 0:3d9c67d97d6f 70 /**
emh203 0:3d9c67d97d6f 71 * @addtogroup cmplx_mag_squared
emh203 0:3d9c67d97d6f 72 * @{
emh203 0:3d9c67d97d6f 73 */
emh203 0:3d9c67d97d6f 74
emh203 0:3d9c67d97d6f 75
emh203 0:3d9c67d97d6f 76 /**
emh203 0:3d9c67d97d6f 77 * @brief Floating-point complex magnitude squared
emh203 0:3d9c67d97d6f 78 * @param[in] *pSrc points to the complex input vector
emh203 0:3d9c67d97d6f 79 * @param[out] *pDst points to the real output vector
emh203 0:3d9c67d97d6f 80 * @param[in] numSamples number of complex samples in the input vector
emh203 0:3d9c67d97d6f 81 * @return none.
emh203 0:3d9c67d97d6f 82 */
emh203 0:3d9c67d97d6f 83
emh203 0:3d9c67d97d6f 84 void arm_cmplx_mag_squared_f32(
emh203 0:3d9c67d97d6f 85 float32_t * pSrc,
emh203 0:3d9c67d97d6f 86 float32_t * pDst,
emh203 0:3d9c67d97d6f 87 uint32_t numSamples)
emh203 0:3d9c67d97d6f 88 {
emh203 0:3d9c67d97d6f 89 float32_t real, imag; /* Temporary variables to store real and imaginary values */
emh203 0:3d9c67d97d6f 90 uint32_t blkCnt; /* loop counter */
emh203 0:3d9c67d97d6f 91
emh203 0:3d9c67d97d6f 92 #ifndef ARM_MATH_CM0_FAMILY
emh203 0:3d9c67d97d6f 93 float32_t real1, real2, real3, real4; /* Temporary variables to hold real values */
emh203 0:3d9c67d97d6f 94 float32_t imag1, imag2, imag3, imag4; /* Temporary variables to hold imaginary values */
emh203 0:3d9c67d97d6f 95 float32_t mul1, mul2, mul3, mul4; /* Temporary variables */
emh203 0:3d9c67d97d6f 96 float32_t mul5, mul6, mul7, mul8; /* Temporary variables */
emh203 0:3d9c67d97d6f 97 float32_t out1, out2, out3, out4; /* Temporary variables to hold output values */
emh203 0:3d9c67d97d6f 98
emh203 0:3d9c67d97d6f 99 /*loop Unrolling */
emh203 0:3d9c67d97d6f 100 blkCnt = numSamples >> 2u;
emh203 0:3d9c67d97d6f 101
emh203 0:3d9c67d97d6f 102 /* First part of the processing with loop unrolling. Compute 4 outputs at a time.
emh203 0:3d9c67d97d6f 103 ** a second loop below computes the remaining 1 to 3 samples. */
emh203 0:3d9c67d97d6f 104 while(blkCnt > 0u)
emh203 0:3d9c67d97d6f 105 {
emh203 0:3d9c67d97d6f 106 /* C[0] = (A[0] * A[0] + A[1] * A[1]) */
emh203 0:3d9c67d97d6f 107 /* read real input sample from source buffer */
emh203 0:3d9c67d97d6f 108 real1 = pSrc[0];
emh203 0:3d9c67d97d6f 109 /* read imaginary input sample from source buffer */
emh203 0:3d9c67d97d6f 110 imag1 = pSrc[1];
emh203 0:3d9c67d97d6f 111
emh203 0:3d9c67d97d6f 112 /* calculate power of real value */
emh203 0:3d9c67d97d6f 113 mul1 = real1 * real1;
emh203 0:3d9c67d97d6f 114
emh203 0:3d9c67d97d6f 115 /* read real input sample from source buffer */
emh203 0:3d9c67d97d6f 116 real2 = pSrc[2];
emh203 0:3d9c67d97d6f 117
emh203 0:3d9c67d97d6f 118 /* calculate power of imaginary value */
emh203 0:3d9c67d97d6f 119 mul2 = imag1 * imag1;
emh203 0:3d9c67d97d6f 120
emh203 0:3d9c67d97d6f 121 /* read imaginary input sample from source buffer */
emh203 0:3d9c67d97d6f 122 imag2 = pSrc[3];
emh203 0:3d9c67d97d6f 123
emh203 0:3d9c67d97d6f 124 /* calculate power of real value */
emh203 0:3d9c67d97d6f 125 mul3 = real2 * real2;
emh203 0:3d9c67d97d6f 126
emh203 0:3d9c67d97d6f 127 /* read real input sample from source buffer */
emh203 0:3d9c67d97d6f 128 real3 = pSrc[4];
emh203 0:3d9c67d97d6f 129
emh203 0:3d9c67d97d6f 130 /* calculate power of imaginary value */
emh203 0:3d9c67d97d6f 131 mul4 = imag2 * imag2;
emh203 0:3d9c67d97d6f 132
emh203 0:3d9c67d97d6f 133 /* read imaginary input sample from source buffer */
emh203 0:3d9c67d97d6f 134 imag3 = pSrc[5];
emh203 0:3d9c67d97d6f 135
emh203 0:3d9c67d97d6f 136 /* calculate power of real value */
emh203 0:3d9c67d97d6f 137 mul5 = real3 * real3;
emh203 0:3d9c67d97d6f 138 /* calculate power of imaginary value */
emh203 0:3d9c67d97d6f 139 mul6 = imag3 * imag3;
emh203 0:3d9c67d97d6f 140
emh203 0:3d9c67d97d6f 141 /* read real input sample from source buffer */
emh203 0:3d9c67d97d6f 142 real4 = pSrc[6];
emh203 0:3d9c67d97d6f 143
emh203 0:3d9c67d97d6f 144 /* accumulate real and imaginary powers */
emh203 0:3d9c67d97d6f 145 out1 = mul1 + mul2;
emh203 0:3d9c67d97d6f 146
emh203 0:3d9c67d97d6f 147 /* read imaginary input sample from source buffer */
emh203 0:3d9c67d97d6f 148 imag4 = pSrc[7];
emh203 0:3d9c67d97d6f 149
emh203 0:3d9c67d97d6f 150 /* accumulate real and imaginary powers */
emh203 0:3d9c67d97d6f 151 out2 = mul3 + mul4;
emh203 0:3d9c67d97d6f 152
emh203 0:3d9c67d97d6f 153 /* calculate power of real value */
emh203 0:3d9c67d97d6f 154 mul7 = real4 * real4;
emh203 0:3d9c67d97d6f 155 /* calculate power of imaginary value */
emh203 0:3d9c67d97d6f 156 mul8 = imag4 * imag4;
emh203 0:3d9c67d97d6f 157
emh203 0:3d9c67d97d6f 158 /* store output to destination */
emh203 0:3d9c67d97d6f 159 pDst[0] = out1;
emh203 0:3d9c67d97d6f 160
emh203 0:3d9c67d97d6f 161 /* accumulate real and imaginary powers */
emh203 0:3d9c67d97d6f 162 out3 = mul5 + mul6;
emh203 0:3d9c67d97d6f 163
emh203 0:3d9c67d97d6f 164 /* store output to destination */
emh203 0:3d9c67d97d6f 165 pDst[1] = out2;
emh203 0:3d9c67d97d6f 166
emh203 0:3d9c67d97d6f 167 /* accumulate real and imaginary powers */
emh203 0:3d9c67d97d6f 168 out4 = mul7 + mul8;
emh203 0:3d9c67d97d6f 169
emh203 0:3d9c67d97d6f 170 /* store output to destination */
emh203 0:3d9c67d97d6f 171 pDst[2] = out3;
emh203 0:3d9c67d97d6f 172
emh203 0:3d9c67d97d6f 173 /* increment destination pointer by 8 to process next samples */
emh203 0:3d9c67d97d6f 174 pSrc += 8u;
emh203 0:3d9c67d97d6f 175
emh203 0:3d9c67d97d6f 176 /* store output to destination */
emh203 0:3d9c67d97d6f 177 pDst[3] = out4;
emh203 0:3d9c67d97d6f 178
emh203 0:3d9c67d97d6f 179 /* increment destination pointer by 4 to process next samples */
emh203 0:3d9c67d97d6f 180 pDst += 4u;
emh203 0:3d9c67d97d6f 181
emh203 0:3d9c67d97d6f 182 /* Decrement the loop counter */
emh203 0:3d9c67d97d6f 183 blkCnt--;
emh203 0:3d9c67d97d6f 184 }
emh203 0:3d9c67d97d6f 185
emh203 0:3d9c67d97d6f 186 /* If the numSamples is not a multiple of 4, compute any remaining output samples here.
emh203 0:3d9c67d97d6f 187 ** No loop unrolling is used. */
emh203 0:3d9c67d97d6f 188 blkCnt = numSamples % 0x4u;
emh203 0:3d9c67d97d6f 189
emh203 0:3d9c67d97d6f 190 #else
emh203 0:3d9c67d97d6f 191
emh203 0:3d9c67d97d6f 192 /* Run the below code for Cortex-M0 */
emh203 0:3d9c67d97d6f 193
emh203 0:3d9c67d97d6f 194 blkCnt = numSamples;
emh203 0:3d9c67d97d6f 195
emh203 0:3d9c67d97d6f 196 #endif /* #ifndef ARM_MATH_CM0_FAMILY */
emh203 0:3d9c67d97d6f 197
emh203 0:3d9c67d97d6f 198 while(blkCnt > 0u)
emh203 0:3d9c67d97d6f 199 {
emh203 0:3d9c67d97d6f 200 /* C[0] = (A[0] * A[0] + A[1] * A[1]) */
emh203 0:3d9c67d97d6f 201 real = *pSrc++;
emh203 0:3d9c67d97d6f 202 imag = *pSrc++;
emh203 0:3d9c67d97d6f 203
emh203 0:3d9c67d97d6f 204 /* out = (real * real) + (imag * imag) */
emh203 0:3d9c67d97d6f 205 /* store the result in the destination buffer. */
emh203 0:3d9c67d97d6f 206 *pDst++ = (real * real) + (imag * imag);
emh203 0:3d9c67d97d6f 207
emh203 0:3d9c67d97d6f 208 /* Decrement the loop counter */
emh203 0:3d9c67d97d6f 209 blkCnt--;
emh203 0:3d9c67d97d6f 210 }
emh203 0:3d9c67d97d6f 211 }
emh203 0:3d9c67d97d6f 212
emh203 0:3d9c67d97d6f 213 /**
emh203 0:3d9c67d97d6f 214 * @} end of cmplx_mag_squared group
emh203 0:3d9c67d97d6f 215 */