Analog Devices / Mbed OS EVAL-CN0540-ARDZ

Dependencies:   platform_drivers LTC26X6 AD77681

CMSIS-DSP_Lib/Source/StatisticsFunctions/arm_mean_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_mean_f32.c
jngarlitos 1:9dd7c64b4a64 9 *
jngarlitos 1:9dd7c64b4a64 10 * Description: Mean 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 mean Mean
jngarlitos 1:9dd7c64b4a64 49 *
jngarlitos 1:9dd7c64b4a64 50 * Calculates the mean of the input vector. Mean is defined as the average of the elements in the vector.
jngarlitos 1:9dd7c64b4a64 51 * The underlying algorithm is used:
jngarlitos 1:9dd7c64b4a64 52 *
jngarlitos 1:9dd7c64b4a64 53 * <pre>
jngarlitos 1:9dd7c64b4a64 54 * Result = (pSrc[0] + pSrc[1] + pSrc[2] + ... + pSrc[blockSize-1]) / blockSize;
jngarlitos 1:9dd7c64b4a64 55 * </pre>
jngarlitos 1:9dd7c64b4a64 56 *
jngarlitos 1:9dd7c64b4a64 57 * There are separate functions for floating-point, Q31, Q15, and Q7 data types.
jngarlitos 1:9dd7c64b4a64 58 */
jngarlitos 1:9dd7c64b4a64 59
jngarlitos 1:9dd7c64b4a64 60 /**
jngarlitos 1:9dd7c64b4a64 61 * @addtogroup mean
jngarlitos 1:9dd7c64b4a64 62 * @{
jngarlitos 1:9dd7c64b4a64 63 */
jngarlitos 1:9dd7c64b4a64 64
jngarlitos 1:9dd7c64b4a64 65
jngarlitos 1:9dd7c64b4a64 66 /**
jngarlitos 1:9dd7c64b4a64 67 * @brief Mean value of a floating-point vector.
jngarlitos 1:9dd7c64b4a64 68 * @param[in] *pSrc points to the input vector
jngarlitos 1:9dd7c64b4a64 69 * @param[in] blockSize length of the input vector
jngarlitos 1:9dd7c64b4a64 70 * @param[out] *pResult mean value returned here
jngarlitos 1:9dd7c64b4a64 71 * @return none.
jngarlitos 1:9dd7c64b4a64 72 */
jngarlitos 1:9dd7c64b4a64 73
jngarlitos 1:9dd7c64b4a64 74
jngarlitos 1:9dd7c64b4a64 75 void arm_mean_f32(
jngarlitos 1:9dd7c64b4a64 76 float32_t * pSrc,
jngarlitos 1:9dd7c64b4a64 77 uint32_t blockSize,
jngarlitos 1:9dd7c64b4a64 78 float32_t * pResult)
jngarlitos 1:9dd7c64b4a64 79 {
jngarlitos 1:9dd7c64b4a64 80 float32_t sum = 0.0f; /* Temporary result storage */
jngarlitos 1:9dd7c64b4a64 81 uint32_t blkCnt; /* loop counter */
jngarlitos 1:9dd7c64b4a64 82
jngarlitos 1:9dd7c64b4a64 83 #ifndef ARM_MATH_CM0_FAMILY
jngarlitos 1:9dd7c64b4a64 84
jngarlitos 1:9dd7c64b4a64 85 /* Run the below code for Cortex-M4 and Cortex-M3 */
jngarlitos 1:9dd7c64b4a64 86 float32_t in1, in2, in3, in4;
jngarlitos 1:9dd7c64b4a64 87
jngarlitos 1:9dd7c64b4a64 88 /*loop Unrolling */
jngarlitos 1:9dd7c64b4a64 89 blkCnt = blockSize >> 2u;
jngarlitos 1:9dd7c64b4a64 90
jngarlitos 1:9dd7c64b4a64 91 /* First part of the processing with loop unrolling. Compute 4 outputs at a time.
jngarlitos 1:9dd7c64b4a64 92 ** a second loop below computes the remaining 1 to 3 samples. */
jngarlitos 1:9dd7c64b4a64 93 while(blkCnt > 0u)
jngarlitos 1:9dd7c64b4a64 94 {
jngarlitos 1:9dd7c64b4a64 95 /* C = (A[0] + A[1] + A[2] + ... + A[blockSize-1]) */
jngarlitos 1:9dd7c64b4a64 96 in1 = *pSrc++;
jngarlitos 1:9dd7c64b4a64 97 in2 = *pSrc++;
jngarlitos 1:9dd7c64b4a64 98 in3 = *pSrc++;
jngarlitos 1:9dd7c64b4a64 99 in4 = *pSrc++;
jngarlitos 1:9dd7c64b4a64 100
jngarlitos 1:9dd7c64b4a64 101 sum += in1;
jngarlitos 1:9dd7c64b4a64 102 sum += in2;
jngarlitos 1:9dd7c64b4a64 103 sum += in3;
jngarlitos 1:9dd7c64b4a64 104 sum += in4;
jngarlitos 1:9dd7c64b4a64 105
jngarlitos 1:9dd7c64b4a64 106 /* Decrement the loop counter */
jngarlitos 1:9dd7c64b4a64 107 blkCnt--;
jngarlitos 1:9dd7c64b4a64 108 }
jngarlitos 1:9dd7c64b4a64 109
jngarlitos 1:9dd7c64b4a64 110 /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
jngarlitos 1:9dd7c64b4a64 111 ** No loop unrolling is used. */
jngarlitos 1:9dd7c64b4a64 112 blkCnt = blockSize % 0x4u;
jngarlitos 1:9dd7c64b4a64 113
jngarlitos 1:9dd7c64b4a64 114 #else
jngarlitos 1:9dd7c64b4a64 115
jngarlitos 1:9dd7c64b4a64 116 /* Run the below code for Cortex-M0 */
jngarlitos 1:9dd7c64b4a64 117
jngarlitos 1:9dd7c64b4a64 118 /* Loop over blockSize number of values */
jngarlitos 1:9dd7c64b4a64 119 blkCnt = blockSize;
jngarlitos 1:9dd7c64b4a64 120
jngarlitos 1:9dd7c64b4a64 121 #endif /* #ifndef ARM_MATH_CM0_FAMILY */
jngarlitos 1:9dd7c64b4a64 122
jngarlitos 1:9dd7c64b4a64 123 while(blkCnt > 0u)
jngarlitos 1:9dd7c64b4a64 124 {
jngarlitos 1:9dd7c64b4a64 125 /* C = (A[0] + A[1] + A[2] + ... + A[blockSize-1]) */
jngarlitos 1:9dd7c64b4a64 126 sum += *pSrc++;
jngarlitos 1:9dd7c64b4a64 127
jngarlitos 1:9dd7c64b4a64 128 /* Decrement the loop counter */
jngarlitos 1:9dd7c64b4a64 129 blkCnt--;
jngarlitos 1:9dd7c64b4a64 130 }
jngarlitos 1:9dd7c64b4a64 131
jngarlitos 1:9dd7c64b4a64 132 /* C = (A[0] + A[1] + A[2] + ... + A[blockSize-1]) / blockSize */
jngarlitos 1:9dd7c64b4a64 133 /* Store the result to the destination */
jngarlitos 1:9dd7c64b4a64 134 *pResult = sum / (float32_t) blockSize;
jngarlitos 1:9dd7c64b4a64 135 }
jngarlitos 1:9dd7c64b4a64 136
jngarlitos 1:9dd7c64b4a64 137 /**
jngarlitos 1:9dd7c64b4a64 138 * @} end of mean group
jngarlitos 1:9dd7c64b4a64 139 */