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

StatisticsFunctions/arm_max_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_max_f32.c
emh203 0:3d9c67d97d6f 9 *
emh203 0:3d9c67d97d6f 10 * Description: Maximum value of a floating-point vector.
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 groupStats
emh203 0:3d9c67d97d6f 45 */
emh203 0:3d9c67d97d6f 46
emh203 0:3d9c67d97d6f 47 /**
emh203 0:3d9c67d97d6f 48 * @defgroup Max Maximum
emh203 0:3d9c67d97d6f 49 *
emh203 0:3d9c67d97d6f 50 * Computes the maximum value of an array of data.
emh203 0:3d9c67d97d6f 51 * The function returns both the maximum value and its position within the array.
emh203 0:3d9c67d97d6f 52 * There are separate functions for floating-point, Q31, Q15, and Q7 data types.
emh203 0:3d9c67d97d6f 53 */
emh203 0:3d9c67d97d6f 54
emh203 0:3d9c67d97d6f 55 /**
emh203 0:3d9c67d97d6f 56 * @addtogroup Max
emh203 0:3d9c67d97d6f 57 * @{
emh203 0:3d9c67d97d6f 58 */
emh203 0:3d9c67d97d6f 59
emh203 0:3d9c67d97d6f 60
emh203 0:3d9c67d97d6f 61 /**
emh203 0:3d9c67d97d6f 62 * @brief Maximum value of a floating-point vector.
emh203 0:3d9c67d97d6f 63 * @param[in] *pSrc points to the input vector
emh203 0:3d9c67d97d6f 64 * @param[in] blockSize length of the input vector
emh203 0:3d9c67d97d6f 65 * @param[out] *pResult maximum value returned here
emh203 0:3d9c67d97d6f 66 * @param[out] *pIndex index of maximum value returned here
emh203 0:3d9c67d97d6f 67 * @return none.
emh203 0:3d9c67d97d6f 68 */
emh203 0:3d9c67d97d6f 69
emh203 0:3d9c67d97d6f 70 void arm_max_f32(
emh203 0:3d9c67d97d6f 71 float32_t * pSrc,
emh203 0:3d9c67d97d6f 72 uint32_t blockSize,
emh203 0:3d9c67d97d6f 73 float32_t * pResult,
emh203 0:3d9c67d97d6f 74 uint32_t * pIndex)
emh203 0:3d9c67d97d6f 75 {
emh203 0:3d9c67d97d6f 76 #ifndef ARM_MATH_CM0_FAMILY
emh203 0:3d9c67d97d6f 77
emh203 0:3d9c67d97d6f 78 /* Run the below code for Cortex-M4 and Cortex-M3 */
emh203 0:3d9c67d97d6f 79 float32_t maxVal1, maxVal2, out; /* Temporary variables to store the output value. */
emh203 0:3d9c67d97d6f 80 uint32_t blkCnt, outIndex, count; /* loop counter */
emh203 0:3d9c67d97d6f 81
emh203 0:3d9c67d97d6f 82 /* Initialise the count value. */
emh203 0:3d9c67d97d6f 83 count = 0u;
emh203 0:3d9c67d97d6f 84 /* Initialise the index value to zero. */
emh203 0:3d9c67d97d6f 85 outIndex = 0u;
emh203 0:3d9c67d97d6f 86 /* Load first input value that act as reference value for comparision */
emh203 0:3d9c67d97d6f 87 out = *pSrc++;
emh203 0:3d9c67d97d6f 88
emh203 0:3d9c67d97d6f 89 /* Loop unrolling */
emh203 0:3d9c67d97d6f 90 blkCnt = (blockSize - 1u) >> 2u;
emh203 0:3d9c67d97d6f 91
emh203 0:3d9c67d97d6f 92 /* Run the below code for Cortex-M4 and Cortex-M3 */
emh203 0:3d9c67d97d6f 93 while(blkCnt > 0u)
emh203 0:3d9c67d97d6f 94 {
emh203 0:3d9c67d97d6f 95 /* Initialize maxVal to the next consecutive values one by one */
emh203 0:3d9c67d97d6f 96 maxVal1 = *pSrc++;
emh203 0:3d9c67d97d6f 97
emh203 0:3d9c67d97d6f 98 maxVal2 = *pSrc++;
emh203 0:3d9c67d97d6f 99
emh203 0:3d9c67d97d6f 100 /* compare for the maximum value */
emh203 0:3d9c67d97d6f 101 if(out < maxVal1)
emh203 0:3d9c67d97d6f 102 {
emh203 0:3d9c67d97d6f 103 /* Update the maximum value and its index */
emh203 0:3d9c67d97d6f 104 out = maxVal1;
emh203 0:3d9c67d97d6f 105 outIndex = count + 1u;
emh203 0:3d9c67d97d6f 106 }
emh203 0:3d9c67d97d6f 107
emh203 0:3d9c67d97d6f 108 maxVal1 = *pSrc++;
emh203 0:3d9c67d97d6f 109
emh203 0:3d9c67d97d6f 110 /* compare for the maximum value */
emh203 0:3d9c67d97d6f 111 if(out < maxVal2)
emh203 0:3d9c67d97d6f 112 {
emh203 0:3d9c67d97d6f 113 /* Update the maximum value and its index */
emh203 0:3d9c67d97d6f 114 out = maxVal2;
emh203 0:3d9c67d97d6f 115 outIndex = count + 2u;
emh203 0:3d9c67d97d6f 116 }
emh203 0:3d9c67d97d6f 117
emh203 0:3d9c67d97d6f 118 maxVal2 = *pSrc++;
emh203 0:3d9c67d97d6f 119
emh203 0:3d9c67d97d6f 120 /* compare for the maximum value */
emh203 0:3d9c67d97d6f 121 if(out < maxVal1)
emh203 0:3d9c67d97d6f 122 {
emh203 0:3d9c67d97d6f 123 /* Update the maximum value and its index */
emh203 0:3d9c67d97d6f 124 out = maxVal1;
emh203 0:3d9c67d97d6f 125 outIndex = count + 3u;
emh203 0:3d9c67d97d6f 126 }
emh203 0:3d9c67d97d6f 127
emh203 0:3d9c67d97d6f 128 /* compare for the maximum value */
emh203 0:3d9c67d97d6f 129 if(out < maxVal2)
emh203 0:3d9c67d97d6f 130 {
emh203 0:3d9c67d97d6f 131 /* Update the maximum value and its index */
emh203 0:3d9c67d97d6f 132 out = maxVal2;
emh203 0:3d9c67d97d6f 133 outIndex = count + 4u;
emh203 0:3d9c67d97d6f 134 }
emh203 0:3d9c67d97d6f 135
emh203 0:3d9c67d97d6f 136 count += 4u;
emh203 0:3d9c67d97d6f 137
emh203 0:3d9c67d97d6f 138 /* Decrement the loop counter */
emh203 0:3d9c67d97d6f 139 blkCnt--;
emh203 0:3d9c67d97d6f 140 }
emh203 0:3d9c67d97d6f 141
emh203 0:3d9c67d97d6f 142 /* if (blockSize - 1u) is not multiple of 4 */
emh203 0:3d9c67d97d6f 143 blkCnt = (blockSize - 1u) % 4u;
emh203 0:3d9c67d97d6f 144
emh203 0:3d9c67d97d6f 145 #else
emh203 0:3d9c67d97d6f 146
emh203 0:3d9c67d97d6f 147 /* Run the below code for Cortex-M0 */
emh203 0:3d9c67d97d6f 148 float32_t maxVal1, out; /* Temporary variables to store the output value. */
emh203 0:3d9c67d97d6f 149 uint32_t blkCnt, outIndex; /* loop counter */
emh203 0:3d9c67d97d6f 150
emh203 0:3d9c67d97d6f 151 /* Initialise the index value to zero. */
emh203 0:3d9c67d97d6f 152 outIndex = 0u;
emh203 0:3d9c67d97d6f 153 /* Load first input value that act as reference value for comparision */
emh203 0:3d9c67d97d6f 154 out = *pSrc++;
emh203 0:3d9c67d97d6f 155
emh203 0:3d9c67d97d6f 156 blkCnt = (blockSize - 1u);
emh203 0:3d9c67d97d6f 157
emh203 0:3d9c67d97d6f 158 #endif /* #ifndef ARM_MATH_CM0_FAMILY */
emh203 0:3d9c67d97d6f 159
emh203 0:3d9c67d97d6f 160 while(blkCnt > 0u)
emh203 0:3d9c67d97d6f 161 {
emh203 0:3d9c67d97d6f 162 /* Initialize maxVal to the next consecutive values one by one */
emh203 0:3d9c67d97d6f 163 maxVal1 = *pSrc++;
emh203 0:3d9c67d97d6f 164
emh203 0:3d9c67d97d6f 165 /* compare for the maximum value */
emh203 0:3d9c67d97d6f 166 if(out < maxVal1)
emh203 0:3d9c67d97d6f 167 {
emh203 0:3d9c67d97d6f 168 /* Update the maximum value and it's index */
emh203 0:3d9c67d97d6f 169 out = maxVal1;
emh203 0:3d9c67d97d6f 170 outIndex = blockSize - blkCnt;
emh203 0:3d9c67d97d6f 171 }
emh203 0:3d9c67d97d6f 172
emh203 0:3d9c67d97d6f 173
emh203 0:3d9c67d97d6f 174 /* Decrement the loop counter */
emh203 0:3d9c67d97d6f 175 blkCnt--;
emh203 0:3d9c67d97d6f 176
emh203 0:3d9c67d97d6f 177 }
emh203 0:3d9c67d97d6f 178
emh203 0:3d9c67d97d6f 179 /* Store the maximum value and it's index into destination pointers */
emh203 0:3d9c67d97d6f 180 *pResult = out;
emh203 0:3d9c67d97d6f 181 *pIndex = outIndex;
emh203 0:3d9c67d97d6f 182 }
emh203 0:3d9c67d97d6f 183
emh203 0:3d9c67d97d6f 184 /**
emh203 0:3d9c67d97d6f 185 * @} end of Max group
emh203 0:3d9c67d97d6f 186 */