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_q15.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_q15.c
emh203 0:3d9c67d97d6f 9 *
emh203 0:3d9c67d97d6f 10 * Description: Q15 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
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_squared
emh203 0:3d9c67d97d6f 49 * @{
emh203 0:3d9c67d97d6f 50 */
emh203 0:3d9c67d97d6f 51
emh203 0:3d9c67d97d6f 52 /**
emh203 0:3d9c67d97d6f 53 * @brief Q15 complex magnitude squared
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 1.15 by 1.15 multiplications and finally output is converted into 3.13 format.
emh203 0:3d9c67d97d6f 62 */
emh203 0:3d9c67d97d6f 63
emh203 0:3d9c67d97d6f 64 void arm_cmplx_mag_squared_q15(
emh203 0:3d9c67d97d6f 65 q15_t * pSrc,
emh203 0:3d9c67d97d6f 66 q15_t * pDst,
emh203 0:3d9c67d97d6f 67 uint32_t numSamples)
emh203 0:3d9c67d97d6f 68 {
emh203 0:3d9c67d97d6f 69 q31_t acc0, acc1; /* Accumulators */
emh203 0:3d9c67d97d6f 70
emh203 0:3d9c67d97d6f 71 #ifndef ARM_MATH_CM0_FAMILY
emh203 0:3d9c67d97d6f 72
emh203 0:3d9c67d97d6f 73 /* Run the below code for Cortex-M4 and Cortex-M3 */
emh203 0:3d9c67d97d6f 74 uint32_t blkCnt; /* loop counter */
emh203 0:3d9c67d97d6f 75 q31_t in1, in2, in3, in4;
emh203 0:3d9c67d97d6f 76 q31_t acc2, acc3;
emh203 0:3d9c67d97d6f 77
emh203 0:3d9c67d97d6f 78 /*loop Unrolling */
emh203 0:3d9c67d97d6f 79 blkCnt = numSamples >> 2u;
emh203 0:3d9c67d97d6f 80
emh203 0:3d9c67d97d6f 81 /* First part of the processing with loop unrolling. Compute 4 outputs at a time.
emh203 0:3d9c67d97d6f 82 ** a second loop below computes the remaining 1 to 3 samples. */
emh203 0:3d9c67d97d6f 83 while(blkCnt > 0u)
emh203 0:3d9c67d97d6f 84 {
emh203 0:3d9c67d97d6f 85 /* C[0] = (A[0] * A[0] + A[1] * A[1]) */
emh203 0:3d9c67d97d6f 86 in1 = *__SIMD32(pSrc)++;
emh203 0:3d9c67d97d6f 87 in2 = *__SIMD32(pSrc)++;
emh203 0:3d9c67d97d6f 88 in3 = *__SIMD32(pSrc)++;
emh203 0:3d9c67d97d6f 89 in4 = *__SIMD32(pSrc)++;
emh203 0:3d9c67d97d6f 90
emh203 0:3d9c67d97d6f 91 acc0 = __SMUAD(in1, in1);
emh203 0:3d9c67d97d6f 92 acc1 = __SMUAD(in2, in2);
emh203 0:3d9c67d97d6f 93 acc2 = __SMUAD(in3, in3);
emh203 0:3d9c67d97d6f 94 acc3 = __SMUAD(in4, in4);
emh203 0:3d9c67d97d6f 95
emh203 0:3d9c67d97d6f 96 /* store the result in 3.13 format in the destination buffer. */
emh203 0:3d9c67d97d6f 97 *pDst++ = (q15_t) (acc0 >> 17);
emh203 0:3d9c67d97d6f 98 *pDst++ = (q15_t) (acc1 >> 17);
emh203 0:3d9c67d97d6f 99 *pDst++ = (q15_t) (acc2 >> 17);
emh203 0:3d9c67d97d6f 100 *pDst++ = (q15_t) (acc3 >> 17);
emh203 0:3d9c67d97d6f 101
emh203 0:3d9c67d97d6f 102 /* Decrement the loop counter */
emh203 0:3d9c67d97d6f 103 blkCnt--;
emh203 0:3d9c67d97d6f 104 }
emh203 0:3d9c67d97d6f 105
emh203 0:3d9c67d97d6f 106 /* If the numSamples is not a multiple of 4, compute any remaining output samples here.
emh203 0:3d9c67d97d6f 107 ** No loop unrolling is used. */
emh203 0:3d9c67d97d6f 108 blkCnt = numSamples % 0x4u;
emh203 0:3d9c67d97d6f 109
emh203 0:3d9c67d97d6f 110 while(blkCnt > 0u)
emh203 0:3d9c67d97d6f 111 {
emh203 0:3d9c67d97d6f 112 /* C[0] = (A[0] * A[0] + A[1] * A[1]) */
emh203 0:3d9c67d97d6f 113 in1 = *__SIMD32(pSrc)++;
emh203 0:3d9c67d97d6f 114 acc0 = __SMUAD(in1, in1);
emh203 0:3d9c67d97d6f 115
emh203 0:3d9c67d97d6f 116 /* store the result in 3.13 format in the destination buffer. */
emh203 0:3d9c67d97d6f 117 *pDst++ = (q15_t) (acc0 >> 17);
emh203 0:3d9c67d97d6f 118
emh203 0:3d9c67d97d6f 119 /* Decrement the loop counter */
emh203 0:3d9c67d97d6f 120 blkCnt--;
emh203 0:3d9c67d97d6f 121 }
emh203 0:3d9c67d97d6f 122
emh203 0:3d9c67d97d6f 123 #else
emh203 0:3d9c67d97d6f 124
emh203 0:3d9c67d97d6f 125 /* Run the below code for Cortex-M0 */
emh203 0:3d9c67d97d6f 126 q15_t real, imag; /* Temporary variables to store real and imaginary values */
emh203 0:3d9c67d97d6f 127
emh203 0:3d9c67d97d6f 128 while(numSamples > 0u)
emh203 0:3d9c67d97d6f 129 {
emh203 0:3d9c67d97d6f 130 /* out = ((real * real) + (imag * imag)) */
emh203 0:3d9c67d97d6f 131 real = *pSrc++;
emh203 0:3d9c67d97d6f 132 imag = *pSrc++;
emh203 0:3d9c67d97d6f 133 acc0 = (real * real);
emh203 0:3d9c67d97d6f 134 acc1 = (imag * imag);
emh203 0:3d9c67d97d6f 135 /* store the result in 3.13 format in the destination buffer. */
emh203 0:3d9c67d97d6f 136 *pDst++ = (q15_t) (((q63_t) acc0 + acc1) >> 17);
emh203 0:3d9c67d97d6f 137
emh203 0:3d9c67d97d6f 138 /* Decrement the loop counter */
emh203 0:3d9c67d97d6f 139 numSamples--;
emh203 0:3d9c67d97d6f 140 }
emh203 0:3d9c67d97d6f 141
emh203 0:3d9c67d97d6f 142 #endif /* #ifndef ARM_MATH_CM0_FAMILY */
emh203 0:3d9c67d97d6f 143
emh203 0:3d9c67d97d6f 144 }
emh203 0:3d9c67d97d6f 145
emh203 0:3d9c67d97d6f 146 /**
emh203 0:3d9c67d97d6f 147 * @} end of cmplx_mag_squared group
emh203 0:3d9c67d97d6f 148 */