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

BasicMathFunctions/arm_abs_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_abs_f32.c
emh203 0:3d9c67d97d6f 9 *
emh203 0:3d9c67d97d6f 10 * Description: Vector absolute value.
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 #include <math.h>
emh203 0:3d9c67d97d6f 43
emh203 0:3d9c67d97d6f 44 /**
emh203 0:3d9c67d97d6f 45 * @ingroup groupMath
emh203 0:3d9c67d97d6f 46 */
emh203 0:3d9c67d97d6f 47
emh203 0:3d9c67d97d6f 48 /**
emh203 0:3d9c67d97d6f 49 * @defgroup BasicAbs Vector Absolute Value
emh203 0:3d9c67d97d6f 50 *
emh203 0:3d9c67d97d6f 51 * Computes the absolute value of a vector on an element-by-element basis.
emh203 0:3d9c67d97d6f 52 *
emh203 0:3d9c67d97d6f 53 * <pre>
emh203 0:3d9c67d97d6f 54 * pDst[n] = abs(pSrc[n]), 0 <= n < blockSize.
emh203 0:3d9c67d97d6f 55 * </pre>
emh203 0:3d9c67d97d6f 56 *
emh203 0:3d9c67d97d6f 57 * The functions support in-place computation allowing the source and
emh203 0:3d9c67d97d6f 58 * destination pointers to reference the same memory buffer.
emh203 0:3d9c67d97d6f 59 * There are separate functions for floating-point, Q7, Q15, and Q31 data types.
emh203 0:3d9c67d97d6f 60 */
emh203 0:3d9c67d97d6f 61
emh203 0:3d9c67d97d6f 62 /**
emh203 0:3d9c67d97d6f 63 * @addtogroup BasicAbs
emh203 0:3d9c67d97d6f 64 * @{
emh203 0:3d9c67d97d6f 65 */
emh203 0:3d9c67d97d6f 66
emh203 0:3d9c67d97d6f 67 /**
emh203 0:3d9c67d97d6f 68 * @brief Floating-point vector absolute value.
emh203 0:3d9c67d97d6f 69 * @param[in] *pSrc points to the input buffer
emh203 0:3d9c67d97d6f 70 * @param[out] *pDst points to the output buffer
emh203 0:3d9c67d97d6f 71 * @param[in] blockSize number of samples in each vector
emh203 0:3d9c67d97d6f 72 * @return none.
emh203 0:3d9c67d97d6f 73 */
emh203 0:3d9c67d97d6f 74
emh203 0:3d9c67d97d6f 75 void arm_abs_f32(
emh203 0:3d9c67d97d6f 76 float32_t * pSrc,
emh203 0:3d9c67d97d6f 77 float32_t * pDst,
emh203 0:3d9c67d97d6f 78 uint32_t blockSize)
emh203 0:3d9c67d97d6f 79 {
emh203 0:3d9c67d97d6f 80 uint32_t blkCnt; /* loop counter */
emh203 0:3d9c67d97d6f 81
emh203 0:3d9c67d97d6f 82 #ifndef ARM_MATH_CM0_FAMILY
emh203 0:3d9c67d97d6f 83
emh203 0:3d9c67d97d6f 84 /* Run the below code for Cortex-M4 and Cortex-M3 */
emh203 0:3d9c67d97d6f 85 float32_t in1, in2, in3, in4; /* temporary variables */
emh203 0:3d9c67d97d6f 86
emh203 0:3d9c67d97d6f 87 /*loop Unrolling */
emh203 0:3d9c67d97d6f 88 blkCnt = blockSize >> 2u;
emh203 0:3d9c67d97d6f 89
emh203 0:3d9c67d97d6f 90 /* First part of the processing with loop unrolling. Compute 4 outputs at a time.
emh203 0:3d9c67d97d6f 91 ** a second loop below computes the remaining 1 to 3 samples. */
emh203 0:3d9c67d97d6f 92 while(blkCnt > 0u)
emh203 0:3d9c67d97d6f 93 {
emh203 0:3d9c67d97d6f 94 /* C = |A| */
emh203 0:3d9c67d97d6f 95 /* Calculate absolute and then store the results in the destination buffer. */
emh203 0:3d9c67d97d6f 96 /* read sample from source */
emh203 0:3d9c67d97d6f 97 in1 = *pSrc;
emh203 0:3d9c67d97d6f 98 in2 = *(pSrc + 1);
emh203 0:3d9c67d97d6f 99 in3 = *(pSrc + 2);
emh203 0:3d9c67d97d6f 100
emh203 0:3d9c67d97d6f 101 /* find absolute value */
emh203 0:3d9c67d97d6f 102 in1 = fabsf(in1);
emh203 0:3d9c67d97d6f 103
emh203 0:3d9c67d97d6f 104 /* read sample from source */
emh203 0:3d9c67d97d6f 105 in4 = *(pSrc + 3);
emh203 0:3d9c67d97d6f 106
emh203 0:3d9c67d97d6f 107 /* find absolute value */
emh203 0:3d9c67d97d6f 108 in2 = fabsf(in2);
emh203 0:3d9c67d97d6f 109
emh203 0:3d9c67d97d6f 110 /* read sample from source */
emh203 0:3d9c67d97d6f 111 *pDst = in1;
emh203 0:3d9c67d97d6f 112
emh203 0:3d9c67d97d6f 113 /* find absolute value */
emh203 0:3d9c67d97d6f 114 in3 = fabsf(in3);
emh203 0:3d9c67d97d6f 115
emh203 0:3d9c67d97d6f 116 /* find absolute value */
emh203 0:3d9c67d97d6f 117 in4 = fabsf(in4);
emh203 0:3d9c67d97d6f 118
emh203 0:3d9c67d97d6f 119 /* store result to destination */
emh203 0:3d9c67d97d6f 120 *(pDst + 1) = in2;
emh203 0:3d9c67d97d6f 121
emh203 0:3d9c67d97d6f 122 /* store result to destination */
emh203 0:3d9c67d97d6f 123 *(pDst + 2) = in3;
emh203 0:3d9c67d97d6f 124
emh203 0:3d9c67d97d6f 125 /* store result to destination */
emh203 0:3d9c67d97d6f 126 *(pDst + 3) = in4;
emh203 0:3d9c67d97d6f 127
emh203 0:3d9c67d97d6f 128
emh203 0:3d9c67d97d6f 129 /* Update source pointer to process next sampels */
emh203 0:3d9c67d97d6f 130 pSrc += 4u;
emh203 0:3d9c67d97d6f 131
emh203 0:3d9c67d97d6f 132 /* Update destination pointer to process next sampels */
emh203 0:3d9c67d97d6f 133 pDst += 4u;
emh203 0:3d9c67d97d6f 134
emh203 0:3d9c67d97d6f 135 /* Decrement the loop counter */
emh203 0:3d9c67d97d6f 136 blkCnt--;
emh203 0:3d9c67d97d6f 137 }
emh203 0:3d9c67d97d6f 138
emh203 0:3d9c67d97d6f 139 /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
emh203 0:3d9c67d97d6f 140 ** No loop unrolling is used. */
emh203 0:3d9c67d97d6f 141 blkCnt = blockSize % 0x4u;
emh203 0:3d9c67d97d6f 142
emh203 0:3d9c67d97d6f 143 #else
emh203 0:3d9c67d97d6f 144
emh203 0:3d9c67d97d6f 145 /* Run the below code for Cortex-M0 */
emh203 0:3d9c67d97d6f 146
emh203 0:3d9c67d97d6f 147 /* Initialize blkCnt with number of samples */
emh203 0:3d9c67d97d6f 148 blkCnt = blockSize;
emh203 0:3d9c67d97d6f 149
emh203 0:3d9c67d97d6f 150 #endif /* #ifndef ARM_MATH_CM0_FAMILY */
emh203 0:3d9c67d97d6f 151
emh203 0:3d9c67d97d6f 152 while(blkCnt > 0u)
emh203 0:3d9c67d97d6f 153 {
emh203 0:3d9c67d97d6f 154 /* C = |A| */
emh203 0:3d9c67d97d6f 155 /* Calculate absolute and then store the results in the destination buffer. */
emh203 0:3d9c67d97d6f 156 *pDst++ = fabsf(*pSrc++);
emh203 0:3d9c67d97d6f 157
emh203 0:3d9c67d97d6f 158 /* Decrement the loop counter */
emh203 0:3d9c67d97d6f 159 blkCnt--;
emh203 0:3d9c67d97d6f 160 }
emh203 0:3d9c67d97d6f 161 }
emh203 0:3d9c67d97d6f 162
emh203 0:3d9c67d97d6f 163 /**
emh203 0:3d9c67d97d6f 164 * @} end of BasicAbs group
emh203 0:3d9c67d97d6f 165 */