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_q31.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_q31.c
emh203 0:3d9c67d97d6f 9 *
emh203 0:3d9c67d97d6f 10 * Description: Q31 complex magnitude
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
emh203 0:3d9c67d97d6f 41 #include "arm_math.h"
emh203 0:3d9c67d97d6f 42
emh203 0:3d9c67d97d6f 43 /**
emh203 0:3d9c67d97d6f 44 * @ingroup groupCmplxMath
emh203 0:3d9c67d97d6f 45 */
emh203 0:3d9c67d97d6f 46
emh203 0:3d9c67d97d6f 47 /**
emh203 0:3d9c67d97d6f 48 * @addtogroup cmplx_mag
emh203 0:3d9c67d97d6f 49 * @{
emh203 0:3d9c67d97d6f 50 */
emh203 0:3d9c67d97d6f 51
emh203 0:3d9c67d97d6f 52 /**
emh203 0:3d9c67d97d6f 53 * @brief Q31 complex magnitude
emh203 0:3d9c67d97d6f 54 * @param *pSrc points to the complex input vector
emh203 0:3d9c67d97d6f 55 * @param *pDst points to the real output vector
emh203 0:3d9c67d97d6f 56 * @param numSamples number of complex samples in the input vector
emh203 0:3d9c67d97d6f 57 * @return none.
emh203 0:3d9c67d97d6f 58 *
emh203 0:3d9c67d97d6f 59 * <b>Scaling and Overflow Behavior:</b>
emh203 0:3d9c67d97d6f 60 * \par
emh203 0:3d9c67d97d6f 61 * The function implements 1.31 by 1.31 multiplications and finally output is converted into 2.30 format.
emh203 0:3d9c67d97d6f 62 * Input down scaling is not required.
emh203 0:3d9c67d97d6f 63 */
emh203 0:3d9c67d97d6f 64
emh203 0:3d9c67d97d6f 65 void arm_cmplx_mag_q31(
emh203 0:3d9c67d97d6f 66 q31_t * pSrc,
emh203 0:3d9c67d97d6f 67 q31_t * pDst,
emh203 0:3d9c67d97d6f 68 uint32_t numSamples)
emh203 0:3d9c67d97d6f 69 {
emh203 0:3d9c67d97d6f 70 q31_t real, imag; /* Temporary variables to hold input values */
emh203 0:3d9c67d97d6f 71 q31_t acc0, acc1; /* Accumulators */
emh203 0:3d9c67d97d6f 72 uint32_t blkCnt; /* loop counter */
emh203 0:3d9c67d97d6f 73
emh203 0:3d9c67d97d6f 74 #ifndef ARM_MATH_CM0_FAMILY
emh203 0:3d9c67d97d6f 75
emh203 0:3d9c67d97d6f 76 /* Run the below code for Cortex-M4 and Cortex-M3 */
emh203 0:3d9c67d97d6f 77 q31_t real1, real2, imag1, imag2; /* Temporary variables to hold input values */
emh203 0:3d9c67d97d6f 78 q31_t out1, out2, out3, out4; /* Accumulators */
emh203 0:3d9c67d97d6f 79 q63_t mul1, mul2, mul3, mul4; /* Temporary variables */
emh203 0:3d9c67d97d6f 80
emh203 0:3d9c67d97d6f 81
emh203 0:3d9c67d97d6f 82 /*loop Unrolling */
emh203 0:3d9c67d97d6f 83 blkCnt = numSamples >> 2u;
emh203 0:3d9c67d97d6f 84
emh203 0:3d9c67d97d6f 85 /* First part of the processing with loop unrolling. Compute 4 outputs at a time.
emh203 0:3d9c67d97d6f 86 ** a second loop below computes the remaining 1 to 3 samples. */
emh203 0:3d9c67d97d6f 87 while(blkCnt > 0u)
emh203 0:3d9c67d97d6f 88 {
emh203 0:3d9c67d97d6f 89 /* read complex input from source buffer */
emh203 0:3d9c67d97d6f 90 real1 = pSrc[0];
emh203 0:3d9c67d97d6f 91 imag1 = pSrc[1];
emh203 0:3d9c67d97d6f 92 real2 = pSrc[2];
emh203 0:3d9c67d97d6f 93 imag2 = pSrc[3];
emh203 0:3d9c67d97d6f 94
emh203 0:3d9c67d97d6f 95 /* calculate power of input values */
emh203 0:3d9c67d97d6f 96 mul1 = (q63_t) real1 *real1;
emh203 0:3d9c67d97d6f 97 mul2 = (q63_t) imag1 *imag1;
emh203 0:3d9c67d97d6f 98 mul3 = (q63_t) real2 *real2;
emh203 0:3d9c67d97d6f 99 mul4 = (q63_t) imag2 *imag2;
emh203 0:3d9c67d97d6f 100
emh203 0:3d9c67d97d6f 101 /* get the result to 3.29 format */
emh203 0:3d9c67d97d6f 102 out1 = (q31_t) (mul1 >> 33);
emh203 0:3d9c67d97d6f 103 out2 = (q31_t) (mul2 >> 33);
emh203 0:3d9c67d97d6f 104 out3 = (q31_t) (mul3 >> 33);
emh203 0:3d9c67d97d6f 105 out4 = (q31_t) (mul4 >> 33);
emh203 0:3d9c67d97d6f 106
emh203 0:3d9c67d97d6f 107 /* add real and imaginary accumulators */
emh203 0:3d9c67d97d6f 108 out1 = out1 + out2;
emh203 0:3d9c67d97d6f 109 out3 = out3 + out4;
emh203 0:3d9c67d97d6f 110
emh203 0:3d9c67d97d6f 111 /* read complex input from source buffer */
emh203 0:3d9c67d97d6f 112 real1 = pSrc[4];
emh203 0:3d9c67d97d6f 113 imag1 = pSrc[5];
emh203 0:3d9c67d97d6f 114 real2 = pSrc[6];
emh203 0:3d9c67d97d6f 115 imag2 = pSrc[7];
emh203 0:3d9c67d97d6f 116
emh203 0:3d9c67d97d6f 117 /* calculate square root */
emh203 0:3d9c67d97d6f 118 arm_sqrt_q31(out1, &pDst[0]);
emh203 0:3d9c67d97d6f 119
emh203 0:3d9c67d97d6f 120 /* calculate power of input values */
emh203 0:3d9c67d97d6f 121 mul1 = (q63_t) real1 *real1;
emh203 0:3d9c67d97d6f 122
emh203 0:3d9c67d97d6f 123 /* calculate square root */
emh203 0:3d9c67d97d6f 124 arm_sqrt_q31(out3, &pDst[1]);
emh203 0:3d9c67d97d6f 125
emh203 0:3d9c67d97d6f 126 /* calculate power of input values */
emh203 0:3d9c67d97d6f 127 mul2 = (q63_t) imag1 *imag1;
emh203 0:3d9c67d97d6f 128 mul3 = (q63_t) real2 *real2;
emh203 0:3d9c67d97d6f 129 mul4 = (q63_t) imag2 *imag2;
emh203 0:3d9c67d97d6f 130
emh203 0:3d9c67d97d6f 131 /* get the result to 3.29 format */
emh203 0:3d9c67d97d6f 132 out1 = (q31_t) (mul1 >> 33);
emh203 0:3d9c67d97d6f 133 out2 = (q31_t) (mul2 >> 33);
emh203 0:3d9c67d97d6f 134 out3 = (q31_t) (mul3 >> 33);
emh203 0:3d9c67d97d6f 135 out4 = (q31_t) (mul4 >> 33);
emh203 0:3d9c67d97d6f 136
emh203 0:3d9c67d97d6f 137 /* add real and imaginary accumulators */
emh203 0:3d9c67d97d6f 138 out1 = out1 + out2;
emh203 0:3d9c67d97d6f 139 out3 = out3 + out4;
emh203 0:3d9c67d97d6f 140
emh203 0:3d9c67d97d6f 141 /* calculate square root */
emh203 0:3d9c67d97d6f 142 arm_sqrt_q31(out1, &pDst[2]);
emh203 0:3d9c67d97d6f 143
emh203 0:3d9c67d97d6f 144 /* increment destination by 8 to process next samples */
emh203 0:3d9c67d97d6f 145 pSrc += 8u;
emh203 0:3d9c67d97d6f 146
emh203 0:3d9c67d97d6f 147 /* calculate square root */
emh203 0:3d9c67d97d6f 148 arm_sqrt_q31(out3, &pDst[3]);
emh203 0:3d9c67d97d6f 149
emh203 0:3d9c67d97d6f 150 /* increment destination by 4 to process next samples */
emh203 0:3d9c67d97d6f 151 pDst += 4u;
emh203 0:3d9c67d97d6f 152
emh203 0:3d9c67d97d6f 153 /* Decrement the loop counter */
emh203 0:3d9c67d97d6f 154 blkCnt--;
emh203 0:3d9c67d97d6f 155 }
emh203 0:3d9c67d97d6f 156
emh203 0:3d9c67d97d6f 157 /* If the numSamples is not a multiple of 4, compute any remaining output samples here.
emh203 0:3d9c67d97d6f 158 ** No loop unrolling is used. */
emh203 0:3d9c67d97d6f 159 blkCnt = numSamples % 0x4u;
emh203 0:3d9c67d97d6f 160
emh203 0:3d9c67d97d6f 161 #else
emh203 0:3d9c67d97d6f 162
emh203 0:3d9c67d97d6f 163 /* Run the below code for Cortex-M0 */
emh203 0:3d9c67d97d6f 164 blkCnt = numSamples;
emh203 0:3d9c67d97d6f 165
emh203 0:3d9c67d97d6f 166 #endif /* #ifndef ARM_MATH_CM0_FAMILY */
emh203 0:3d9c67d97d6f 167
emh203 0:3d9c67d97d6f 168 while(blkCnt > 0u)
emh203 0:3d9c67d97d6f 169 {
emh203 0:3d9c67d97d6f 170 /* C[0] = sqrt(A[0] * A[0] + A[1] * A[1]) */
emh203 0:3d9c67d97d6f 171 real = *pSrc++;
emh203 0:3d9c67d97d6f 172 imag = *pSrc++;
emh203 0:3d9c67d97d6f 173 acc0 = (q31_t) (((q63_t) real * real) >> 33);
emh203 0:3d9c67d97d6f 174 acc1 = (q31_t) (((q63_t) imag * imag) >> 33);
emh203 0:3d9c67d97d6f 175 /* store the result in 2.30 format in the destination buffer. */
emh203 0:3d9c67d97d6f 176 arm_sqrt_q31(acc0 + acc1, pDst++);
emh203 0:3d9c67d97d6f 177
emh203 0:3d9c67d97d6f 178 /* Decrement the loop counter */
emh203 0:3d9c67d97d6f 179 blkCnt--;
emh203 0:3d9c67d97d6f 180 }
emh203 0:3d9c67d97d6f 181 }
emh203 0:3d9c67d97d6f 182
emh203 0:3d9c67d97d6f 183 /**
emh203 0:3d9c67d97d6f 184 * @} end of cmplx_mag group
emh203 0:3d9c67d97d6f 185 */