Analog Devices / Mbed OS EVAL-CN0540-ARDZ

Dependencies:   platform_drivers LTC26X6 AD77681

CMSIS-DSP_Lib/Source/StatisticsFunctions/arm_min_f32.c@1:9dd7c64b4a64, 2021-12-06 (annotated)

Committer:
jngarlitos
Date:
Mon Dec 06 05:22:28 2021 +0000
Revision:
1:9dd7c64b4a64
EVAL-CN0540-ARDZ mbed example program Initial Commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jngarlitos 1:9dd7c64b4a64 1 /* ----------------------------------------------------------------------
jngarlitos 1:9dd7c64b4a64 2 * Copyright (C) 2010-2014 ARM Limited. All rights reserved.
jngarlitos 1:9dd7c64b4a64 3 *
jngarlitos 1:9dd7c64b4a64 4 * $Date: 19. March 2015
jngarlitos 1:9dd7c64b4a64 5 * $Revision: V.1.4.5
jngarlitos 1:9dd7c64b4a64 6 *
jngarlitos 1:9dd7c64b4a64 7 * Project: CMSIS DSP Library
jngarlitos 1:9dd7c64b4a64 8 * Title: arm_min_f32.c
jngarlitos 1:9dd7c64b4a64 9 *
jngarlitos 1:9dd7c64b4a64 10 * Description: Minimum value of a floating-point vector.
jngarlitos 1:9dd7c64b4a64 11 *
jngarlitos 1:9dd7c64b4a64 12 * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
jngarlitos 1:9dd7c64b4a64 13 *
jngarlitos 1:9dd7c64b4a64 14 * Redistribution and use in source and binary forms, with or without
jngarlitos 1:9dd7c64b4a64 15 * modification, are permitted provided that the following conditions
jngarlitos 1:9dd7c64b4a64 16 * are met:
jngarlitos 1:9dd7c64b4a64 17 * - Redistributions of source code must retain the above copyright
jngarlitos 1:9dd7c64b4a64 18 * notice, this list of conditions and the following disclaimer.
jngarlitos 1:9dd7c64b4a64 19 * - Redistributions in binary form must reproduce the above copyright
jngarlitos 1:9dd7c64b4a64 20 * notice, this list of conditions and the following disclaimer in
jngarlitos 1:9dd7c64b4a64 21 * the documentation and/or other materials provided with the
jngarlitos 1:9dd7c64b4a64 22 * distribution.
jngarlitos 1:9dd7c64b4a64 23 * - Neither the name of ARM LIMITED nor the names of its contributors
jngarlitos 1:9dd7c64b4a64 24 * may be used to endorse or promote products derived from this
jngarlitos 1:9dd7c64b4a64 25 * software without specific prior written permission.
jngarlitos 1:9dd7c64b4a64 26 *
jngarlitos 1:9dd7c64b4a64 27 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
jngarlitos 1:9dd7c64b4a64 28 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
jngarlitos 1:9dd7c64b4a64 29 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
jngarlitos 1:9dd7c64b4a64 30 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
jngarlitos 1:9dd7c64b4a64 31 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
jngarlitos 1:9dd7c64b4a64 32 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
jngarlitos 1:9dd7c64b4a64 33 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
jngarlitos 1:9dd7c64b4a64 34 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
jngarlitos 1:9dd7c64b4a64 35 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
jngarlitos 1:9dd7c64b4a64 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
jngarlitos 1:9dd7c64b4a64 37 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
jngarlitos 1:9dd7c64b4a64 38 * POSSIBILITY OF SUCH DAMAGE.
jngarlitos 1:9dd7c64b4a64 39 * ---------------------------------------------------------------------------- */
jngarlitos 1:9dd7c64b4a64 40
jngarlitos 1:9dd7c64b4a64 41 #include "arm_math.h"
jngarlitos 1:9dd7c64b4a64 42
jngarlitos 1:9dd7c64b4a64 43 /**
jngarlitos 1:9dd7c64b4a64 44 * @ingroup groupStats
jngarlitos 1:9dd7c64b4a64 45 */
jngarlitos 1:9dd7c64b4a64 46
jngarlitos 1:9dd7c64b4a64 47 /**
jngarlitos 1:9dd7c64b4a64 48 * @defgroup Min Minimum
jngarlitos 1:9dd7c64b4a64 49 *
jngarlitos 1:9dd7c64b4a64 50 * Computes the minimum value of an array of data.
jngarlitos 1:9dd7c64b4a64 51 * The function returns both the minimum value and its position within the array.
jngarlitos 1:9dd7c64b4a64 52 * There are separate functions for floating-point, Q31, Q15, and Q7 data types.
jngarlitos 1:9dd7c64b4a64 53 */
jngarlitos 1:9dd7c64b4a64 54
jngarlitos 1:9dd7c64b4a64 55 /**
jngarlitos 1:9dd7c64b4a64 56 * @addtogroup Min
jngarlitos 1:9dd7c64b4a64 57 * @{
jngarlitos 1:9dd7c64b4a64 58 */
jngarlitos 1:9dd7c64b4a64 59
jngarlitos 1:9dd7c64b4a64 60
jngarlitos 1:9dd7c64b4a64 61 /**
jngarlitos 1:9dd7c64b4a64 62 * @brief Minimum value of a floating-point vector.
jngarlitos 1:9dd7c64b4a64 63 * @param[in] *pSrc points to the input vector
jngarlitos 1:9dd7c64b4a64 64 * @param[in] blockSize length of the input vector
jngarlitos 1:9dd7c64b4a64 65 * @param[out] *pResult minimum value returned here
jngarlitos 1:9dd7c64b4a64 66 * @param[out] *pIndex index of minimum value returned here
jngarlitos 1:9dd7c64b4a64 67 * @return none.
jngarlitos 1:9dd7c64b4a64 68 *
jngarlitos 1:9dd7c64b4a64 69 */
jngarlitos 1:9dd7c64b4a64 70
jngarlitos 1:9dd7c64b4a64 71 void arm_min_f32(
jngarlitos 1:9dd7c64b4a64 72 float32_t * pSrc,
jngarlitos 1:9dd7c64b4a64 73 uint32_t blockSize,
jngarlitos 1:9dd7c64b4a64 74 float32_t * pResult,
jngarlitos 1:9dd7c64b4a64 75 uint32_t * pIndex)
jngarlitos 1:9dd7c64b4a64 76 {
jngarlitos 1:9dd7c64b4a64 77 #ifndef ARM_MATH_CM0_FAMILY
jngarlitos 1:9dd7c64b4a64 78
jngarlitos 1:9dd7c64b4a64 79 /* Run the below code for Cortex-M4 and Cortex-M3 */
jngarlitos 1:9dd7c64b4a64 80
jngarlitos 1:9dd7c64b4a64 81 float32_t minVal1, minVal2, out; /* Temporary variables to store the output value. */
jngarlitos 1:9dd7c64b4a64 82 uint32_t blkCnt, outIndex, count; /* loop counter */
jngarlitos 1:9dd7c64b4a64 83
jngarlitos 1:9dd7c64b4a64 84 /* Initialise the count value. */
jngarlitos 1:9dd7c64b4a64 85 count = 0u;
jngarlitos 1:9dd7c64b4a64 86 /* Initialise the index value to zero. */
jngarlitos 1:9dd7c64b4a64 87 outIndex = 0u;
jngarlitos 1:9dd7c64b4a64 88 /* Load first input value that act as reference value for comparision */
jngarlitos 1:9dd7c64b4a64 89 out = *pSrc++;
jngarlitos 1:9dd7c64b4a64 90
jngarlitos 1:9dd7c64b4a64 91 /* Loop unrolling */
jngarlitos 1:9dd7c64b4a64 92 blkCnt = (blockSize - 1u) >> 2u;
jngarlitos 1:9dd7c64b4a64 93
jngarlitos 1:9dd7c64b4a64 94 while(blkCnt > 0)
jngarlitos 1:9dd7c64b4a64 95 {
jngarlitos 1:9dd7c64b4a64 96 /* Initialize minVal to the next consecutive values one by one */
jngarlitos 1:9dd7c64b4a64 97 minVal1 = *pSrc++;
jngarlitos 1:9dd7c64b4a64 98 minVal2 = *pSrc++;
jngarlitos 1:9dd7c64b4a64 99
jngarlitos 1:9dd7c64b4a64 100 /* compare for the minimum value */
jngarlitos 1:9dd7c64b4a64 101 if(out > minVal1)
jngarlitos 1:9dd7c64b4a64 102 {
jngarlitos 1:9dd7c64b4a64 103 /* Update the minimum value and its index */
jngarlitos 1:9dd7c64b4a64 104 out = minVal1;
jngarlitos 1:9dd7c64b4a64 105 outIndex = count + 1u;
jngarlitos 1:9dd7c64b4a64 106 }
jngarlitos 1:9dd7c64b4a64 107
jngarlitos 1:9dd7c64b4a64 108 minVal1 = *pSrc++;
jngarlitos 1:9dd7c64b4a64 109
jngarlitos 1:9dd7c64b4a64 110 /* compare for the minimum value */
jngarlitos 1:9dd7c64b4a64 111 if(out > minVal2)
jngarlitos 1:9dd7c64b4a64 112 {
jngarlitos 1:9dd7c64b4a64 113 /* Update the minimum value and its index */
jngarlitos 1:9dd7c64b4a64 114 out = minVal2;
jngarlitos 1:9dd7c64b4a64 115 outIndex = count + 2u;
jngarlitos 1:9dd7c64b4a64 116 }
jngarlitos 1:9dd7c64b4a64 117
jngarlitos 1:9dd7c64b4a64 118 minVal2 = *pSrc++;
jngarlitos 1:9dd7c64b4a64 119
jngarlitos 1:9dd7c64b4a64 120 /* compare for the minimum value */
jngarlitos 1:9dd7c64b4a64 121 if(out > minVal1)
jngarlitos 1:9dd7c64b4a64 122 {
jngarlitos 1:9dd7c64b4a64 123 /* Update the minimum value and its index */
jngarlitos 1:9dd7c64b4a64 124 out = minVal1;
jngarlitos 1:9dd7c64b4a64 125 outIndex = count + 3u;
jngarlitos 1:9dd7c64b4a64 126 }
jngarlitos 1:9dd7c64b4a64 127
jngarlitos 1:9dd7c64b4a64 128 /* compare for the minimum value */
jngarlitos 1:9dd7c64b4a64 129 if(out > minVal2)
jngarlitos 1:9dd7c64b4a64 130 {
jngarlitos 1:9dd7c64b4a64 131 /* Update the minimum value and its index */
jngarlitos 1:9dd7c64b4a64 132 out = minVal2;
jngarlitos 1:9dd7c64b4a64 133 outIndex = count + 4u;
jngarlitos 1:9dd7c64b4a64 134 }
jngarlitos 1:9dd7c64b4a64 135
jngarlitos 1:9dd7c64b4a64 136 count += 4u;
jngarlitos 1:9dd7c64b4a64 137
jngarlitos 1:9dd7c64b4a64 138 blkCnt--;
jngarlitos 1:9dd7c64b4a64 139 }
jngarlitos 1:9dd7c64b4a64 140
jngarlitos 1:9dd7c64b4a64 141 /* if (blockSize - 1u ) is not multiple of 4 */
jngarlitos 1:9dd7c64b4a64 142 blkCnt = (blockSize - 1u) % 4u;
jngarlitos 1:9dd7c64b4a64 143
jngarlitos 1:9dd7c64b4a64 144 #else
jngarlitos 1:9dd7c64b4a64 145
jngarlitos 1:9dd7c64b4a64 146 /* Run the below code for Cortex-M0 */
jngarlitos 1:9dd7c64b4a64 147 float32_t minVal1, out; /* Temporary variables to store the output value. */
jngarlitos 1:9dd7c64b4a64 148 uint32_t blkCnt, outIndex; /* loop counter */
jngarlitos 1:9dd7c64b4a64 149
jngarlitos 1:9dd7c64b4a64 150 /* Initialise the index value to zero. */
jngarlitos 1:9dd7c64b4a64 151 outIndex = 0u;
jngarlitos 1:9dd7c64b4a64 152 /* Load first input value that act as reference value for comparision */
jngarlitos 1:9dd7c64b4a64 153 out = *pSrc++;
jngarlitos 1:9dd7c64b4a64 154
jngarlitos 1:9dd7c64b4a64 155 blkCnt = (blockSize - 1u);
jngarlitos 1:9dd7c64b4a64 156
jngarlitos 1:9dd7c64b4a64 157 #endif // #ifndef ARM_MATH_CM0_FAMILY
jngarlitos 1:9dd7c64b4a64 158
jngarlitos 1:9dd7c64b4a64 159 while(blkCnt > 0)
jngarlitos 1:9dd7c64b4a64 160 {
jngarlitos 1:9dd7c64b4a64 161 /* Initialize minVal to the next consecutive values one by one */
jngarlitos 1:9dd7c64b4a64 162 minVal1 = *pSrc++;
jngarlitos 1:9dd7c64b4a64 163
jngarlitos 1:9dd7c64b4a64 164 /* compare for the minimum value */
jngarlitos 1:9dd7c64b4a64 165 if(out > minVal1)
jngarlitos 1:9dd7c64b4a64 166 {
jngarlitos 1:9dd7c64b4a64 167 /* Update the minimum value and it's index */
jngarlitos 1:9dd7c64b4a64 168 out = minVal1;
jngarlitos 1:9dd7c64b4a64 169 outIndex = blockSize - blkCnt;
jngarlitos 1:9dd7c64b4a64 170 }
jngarlitos 1:9dd7c64b4a64 171
jngarlitos 1:9dd7c64b4a64 172 blkCnt--;
jngarlitos 1:9dd7c64b4a64 173
jngarlitos 1:9dd7c64b4a64 174 }
jngarlitos 1:9dd7c64b4a64 175
jngarlitos 1:9dd7c64b4a64 176 /* Store the minimum value and it's index into destination pointers */
jngarlitos 1:9dd7c64b4a64 177 *pResult = out;
jngarlitos 1:9dd7c64b4a64 178 *pIndex = outIndex;
jngarlitos 1:9dd7c64b4a64 179 }
jngarlitos 1:9dd7c64b4a64 180
jngarlitos 1:9dd7c64b4a64 181 /**
jngarlitos 1:9dd7c64b4a64 182 * @} end of Min group
jngarlitos 1:9dd7c64b4a64 183 */