Analog Devices / Mbed OS EVAL-CN0540-ARDZ

Dependencies:   platform_drivers LTC26X6 AD77681

CMSIS-DSP_Lib/Source/StatisticsFunctions/arm_max_q15.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_max_q15.c
jngarlitos 1:9dd7c64b4a64 9 *
jngarlitos 1:9dd7c64b4a64 10 * Description: Maximum value of a Q15 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 * @addtogroup Max
jngarlitos 1:9dd7c64b4a64 49 * @{
jngarlitos 1:9dd7c64b4a64 50 */
jngarlitos 1:9dd7c64b4a64 51
jngarlitos 1:9dd7c64b4a64 52
jngarlitos 1:9dd7c64b4a64 53 /**
jngarlitos 1:9dd7c64b4a64 54 * @brief Maximum value of a Q15 vector.
jngarlitos 1:9dd7c64b4a64 55 * @param[in] *pSrc points to the input vector
jngarlitos 1:9dd7c64b4a64 56 * @param[in] blockSize length of the input vector
jngarlitos 1:9dd7c64b4a64 57 * @param[out] *pResult maximum value returned here
jngarlitos 1:9dd7c64b4a64 58 * @param[out] *pIndex index of maximum value returned here
jngarlitos 1:9dd7c64b4a64 59 * @return none.
jngarlitos 1:9dd7c64b4a64 60 */
jngarlitos 1:9dd7c64b4a64 61
jngarlitos 1:9dd7c64b4a64 62 void arm_max_q15(
jngarlitos 1:9dd7c64b4a64 63 q15_t * pSrc,
jngarlitos 1:9dd7c64b4a64 64 uint32_t blockSize,
jngarlitos 1:9dd7c64b4a64 65 q15_t * pResult,
jngarlitos 1:9dd7c64b4a64 66 uint32_t * pIndex)
jngarlitos 1:9dd7c64b4a64 67 {
jngarlitos 1:9dd7c64b4a64 68 #ifndef ARM_MATH_CM0_FAMILY
jngarlitos 1:9dd7c64b4a64 69
jngarlitos 1:9dd7c64b4a64 70 /* Run the below code for Cortex-M4 and Cortex-M3 */
jngarlitos 1:9dd7c64b4a64 71 q15_t maxVal1, maxVal2, out; /* Temporary variables to store the output value. */
jngarlitos 1:9dd7c64b4a64 72 uint32_t blkCnt, outIndex, count; /* loop counter */
jngarlitos 1:9dd7c64b4a64 73
jngarlitos 1:9dd7c64b4a64 74 /* Initialise the count value. */
jngarlitos 1:9dd7c64b4a64 75 count = 0u;
jngarlitos 1:9dd7c64b4a64 76 /* Initialise the index value to zero. */
jngarlitos 1:9dd7c64b4a64 77 outIndex = 0u;
jngarlitos 1:9dd7c64b4a64 78 /* Load first input value that act as reference value for comparision */
jngarlitos 1:9dd7c64b4a64 79 out = *pSrc++;
jngarlitos 1:9dd7c64b4a64 80
jngarlitos 1:9dd7c64b4a64 81 /* Loop unrolling */
jngarlitos 1:9dd7c64b4a64 82 blkCnt = (blockSize - 1u) >> 2u;
jngarlitos 1:9dd7c64b4a64 83
jngarlitos 1:9dd7c64b4a64 84 /* Run the below code for Cortex-M4 and Cortex-M3 */
jngarlitos 1:9dd7c64b4a64 85 while(blkCnt > 0u)
jngarlitos 1:9dd7c64b4a64 86 {
jngarlitos 1:9dd7c64b4a64 87 /* Initialize maxVal to the next consecutive values one by one */
jngarlitos 1:9dd7c64b4a64 88 maxVal1 = *pSrc++;
jngarlitos 1:9dd7c64b4a64 89
jngarlitos 1:9dd7c64b4a64 90 maxVal2 = *pSrc++;
jngarlitos 1:9dd7c64b4a64 91
jngarlitos 1:9dd7c64b4a64 92 /* compare for the maximum value */
jngarlitos 1:9dd7c64b4a64 93 if(out < maxVal1)
jngarlitos 1:9dd7c64b4a64 94 {
jngarlitos 1:9dd7c64b4a64 95 /* Update the maximum value and its index */
jngarlitos 1:9dd7c64b4a64 96 out = maxVal1;
jngarlitos 1:9dd7c64b4a64 97 outIndex = count + 1u;
jngarlitos 1:9dd7c64b4a64 98 }
jngarlitos 1:9dd7c64b4a64 99
jngarlitos 1:9dd7c64b4a64 100 maxVal1 = *pSrc++;
jngarlitos 1:9dd7c64b4a64 101
jngarlitos 1:9dd7c64b4a64 102 /* compare for the maximum value */
jngarlitos 1:9dd7c64b4a64 103 if(out < maxVal2)
jngarlitos 1:9dd7c64b4a64 104 {
jngarlitos 1:9dd7c64b4a64 105 /* Update the maximum value and its index */
jngarlitos 1:9dd7c64b4a64 106 out = maxVal2;
jngarlitos 1:9dd7c64b4a64 107 outIndex = count + 2u;
jngarlitos 1:9dd7c64b4a64 108 }
jngarlitos 1:9dd7c64b4a64 109
jngarlitos 1:9dd7c64b4a64 110 maxVal2 = *pSrc++;
jngarlitos 1:9dd7c64b4a64 111
jngarlitos 1:9dd7c64b4a64 112 /* compare for the maximum value */
jngarlitos 1:9dd7c64b4a64 113 if(out < maxVal1)
jngarlitos 1:9dd7c64b4a64 114 {
jngarlitos 1:9dd7c64b4a64 115 /* Update the maximum value and its index */
jngarlitos 1:9dd7c64b4a64 116 out = maxVal1;
jngarlitos 1:9dd7c64b4a64 117 outIndex = count + 3u;
jngarlitos 1:9dd7c64b4a64 118 }
jngarlitos 1:9dd7c64b4a64 119
jngarlitos 1:9dd7c64b4a64 120 /* compare for the maximum value */
jngarlitos 1:9dd7c64b4a64 121 if(out < maxVal2)
jngarlitos 1:9dd7c64b4a64 122 {
jngarlitos 1:9dd7c64b4a64 123 /* Update the maximum value and its index */
jngarlitos 1:9dd7c64b4a64 124 out = maxVal2;
jngarlitos 1:9dd7c64b4a64 125 outIndex = count + 4u;
jngarlitos 1:9dd7c64b4a64 126 }
jngarlitos 1:9dd7c64b4a64 127
jngarlitos 1:9dd7c64b4a64 128 count += 4u;
jngarlitos 1:9dd7c64b4a64 129
jngarlitos 1:9dd7c64b4a64 130 /* Decrement the loop counter */
jngarlitos 1:9dd7c64b4a64 131 blkCnt--;
jngarlitos 1:9dd7c64b4a64 132 }
jngarlitos 1:9dd7c64b4a64 133
jngarlitos 1:9dd7c64b4a64 134 /* if (blockSize - 1u) is not multiple of 4 */
jngarlitos 1:9dd7c64b4a64 135 blkCnt = (blockSize - 1u) % 4u;
jngarlitos 1:9dd7c64b4a64 136
jngarlitos 1:9dd7c64b4a64 137 #else
jngarlitos 1:9dd7c64b4a64 138
jngarlitos 1:9dd7c64b4a64 139 /* Run the below code for Cortex-M0 */
jngarlitos 1:9dd7c64b4a64 140 q15_t maxVal1, out; /* Temporary variables to store the output value. */
jngarlitos 1:9dd7c64b4a64 141 uint32_t blkCnt, outIndex; /* loop counter */
jngarlitos 1:9dd7c64b4a64 142
jngarlitos 1:9dd7c64b4a64 143 blkCnt = (blockSize - 1u);
jngarlitos 1:9dd7c64b4a64 144
jngarlitos 1:9dd7c64b4a64 145 /* Initialise the index value to zero. */
jngarlitos 1:9dd7c64b4a64 146 outIndex = 0u;
jngarlitos 1:9dd7c64b4a64 147 /* Load first input value that act as reference value for comparision */
jngarlitos 1:9dd7c64b4a64 148 out = *pSrc++;
jngarlitos 1:9dd7c64b4a64 149
jngarlitos 1:9dd7c64b4a64 150 #endif /* #ifndef ARM_MATH_CM0_FAMILY */
jngarlitos 1:9dd7c64b4a64 151
jngarlitos 1:9dd7c64b4a64 152 while(blkCnt > 0u)
jngarlitos 1:9dd7c64b4a64 153 {
jngarlitos 1:9dd7c64b4a64 154 /* Initialize maxVal to the next consecutive values one by one */
jngarlitos 1:9dd7c64b4a64 155 maxVal1 = *pSrc++;
jngarlitos 1:9dd7c64b4a64 156
jngarlitos 1:9dd7c64b4a64 157 /* compare for the maximum value */
jngarlitos 1:9dd7c64b4a64 158 if(out < maxVal1)
jngarlitos 1:9dd7c64b4a64 159 {
jngarlitos 1:9dd7c64b4a64 160 /* Update the maximum value and it's index */
jngarlitos 1:9dd7c64b4a64 161 out = maxVal1;
jngarlitos 1:9dd7c64b4a64 162 outIndex = blockSize - blkCnt;
jngarlitos 1:9dd7c64b4a64 163 }
jngarlitos 1:9dd7c64b4a64 164 /* Decrement the loop counter */
jngarlitos 1:9dd7c64b4a64 165 blkCnt--;
jngarlitos 1:9dd7c64b4a64 166
jngarlitos 1:9dd7c64b4a64 167 }
jngarlitos 1:9dd7c64b4a64 168
jngarlitos 1:9dd7c64b4a64 169 /* Store the maximum value and its index into destination pointers */
jngarlitos 1:9dd7c64b4a64 170 *pResult = out;
jngarlitos 1:9dd7c64b4a64 171 *pIndex = outIndex;
jngarlitos 1:9dd7c64b4a64 172 }
jngarlitos 1:9dd7c64b4a64 173
jngarlitos 1:9dd7c64b4a64 174 /**
jngarlitos 1:9dd7c64b4a64 175 * @} end of Max group
jngarlitos 1:9dd7c64b4a64 176 */