From 6ab94e0b318884bbcb95e2ea3835f951502e1d99 Mon Sep 17 00:00:00 2001 From: jaseg Date: Wed, 14 Oct 2020 12:47:28 +0200 Subject: Move firmware into subdirectory --- .../DSP/Source/StatisticsFunctions/arm_var_f32.c | 181 +++++++++++++++++++++ 1 file changed, 181 insertions(+) create mode 100644 fw/cdc-dials/Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_var_f32.c (limited to 'fw/cdc-dials/Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_var_f32.c') diff --git a/fw/cdc-dials/Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_var_f32.c b/fw/cdc-dials/Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_var_f32.c new file mode 100644 index 0000000..a366f5c --- /dev/null +++ b/fw/cdc-dials/Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_var_f32.c @@ -0,0 +1,181 @@ +/* ---------------------------------------------------------------------- + * Project: CMSIS DSP Library + * Title: arm_var_f32.c + * Description: Variance of the elements of a floating-point vector + * + * $Date: 27. January 2017 + * $Revision: V.1.5.1 + * + * Target Processor: Cortex-M cores + * -------------------------------------------------------------------- */ +/* + * Copyright (C) 2010-2017 ARM Limited or its affiliates. All rights reserved. + * + * SPDX-License-Identifier: Apache-2.0 + * + * Licensed under the Apache License, Version 2.0 (the License); you may + * not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an AS IS BASIS, WITHOUT + * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#include "arm_math.h" + +/** + * @ingroup groupStats + */ + +/** + * @defgroup variance Variance + * + * Calculates the variance of the elements in the input vector. + * The underlying algorithm used is the direct method sometimes referred to as the two-pass method: + * + * 
+ *   Result = sum(element - meanOfElements)^2) / numElement - 1
+ *
+ *     where, meanOfElements = ( pSrc[0] * pSrc[0] + pSrc[1] * pSrc[1] + ... + pSrc[blockSize-1] ) / blockSize
+ *
+ *
+ * + * There are separate functions for floating point, Q31, and Q15 data types. + */ + +/** + * @addtogroup variance + * @{ + */ + + +/** + * @brief Variance of the elements of a floating-point vector. + * @param[in] *pSrc points to the input vector + * @param[in] blockSize length of the input vector + * @param[out] *pResult variance value returned here + * @return none. + */ + +void arm_var_f32( + float32_t * pSrc, + uint32_t blockSize, + float32_t * pResult) +{ + float32_t fMean, fValue; + uint32_t blkCnt; /* loop counter */ + float32_t * pInput = pSrc; + float32_t sum = 0.0f; + float32_t fSum = 0.0f; + #if defined(ARM_MATH_DSP) + float32_t in1, in2, in3, in4; + #endif + + if (blockSize <= 1U) + { + *pResult = 0; + return; + } + + #if defined(ARM_MATH_DSP) + /* Run the below code for Cortex-M4 and Cortex-M7 */ + + /*loop Unrolling */ + blkCnt = blockSize >> 2U; + + /* First part of the processing with loop unrolling. Compute 4 outputs at a time. + ** a second loop below computes the remaining 1 to 3 samples. */ + while (blkCnt > 0U) + { + /* C = (A[0] + A[1] + A[2] + ... + A[blockSize-1]) */ + in1 = *pInput++; + in2 = *pInput++; + in3 = *pInput++; + in4 = *pInput++; + + sum += in1; + sum += in2; + sum += in3; + sum += in4; + + /* Decrement the loop counter */ + blkCnt--; + } + + /* If the blockSize is not a multiple of 4, compute any remaining output samples here. + ** No loop unrolling is used. */ + blkCnt = blockSize % 0x4U; + + #else + /* Run the below code for Cortex-M0 or Cortex-M3 */ + + /* Loop over blockSize number of values */ + blkCnt = blockSize; + + #endif + + while (blkCnt > 0U) + { + /* C = (A[0] + A[1] + A[2] + ... + A[blockSize-1]) */ + sum += *pInput++; + + /* Decrement the loop counter */ + blkCnt--; + } + + /* C = (A[0] + A[1] + A[2] + ... + A[blockSize-1]) / blockSize */ + fMean = sum / (float32_t) blockSize; + + pInput = pSrc; + + #if defined(ARM_MATH_DSP) + + /*loop Unrolling */ + blkCnt = blockSize >> 2U; + + /* First part of the processing with loop unrolling. Compute 4 outputs at a time. + ** a second loop below computes the remaining 1 to 3 samples. */ + while (blkCnt > 0U) + { + fValue = *pInput++ - fMean; + fSum += fValue * fValue; + fValue = *pInput++ - fMean; + fSum += fValue * fValue; + fValue = *pInput++ - fMean; + fSum += fValue * fValue; + fValue = *pInput++ - fMean; + fSum += fValue * fValue; + + /* Decrement the loop counter */ + blkCnt--; + } + + blkCnt = blockSize % 0x4U; + #else + /* Run the below code for Cortex-M0 or Cortex-M3 */ + + /* Loop over blockSize number of values */ + blkCnt = blockSize; + #endif + + while (blkCnt > 0U) + { + fValue = *pInput++ - fMean; + fSum += fValue * fValue; + + /* Decrement the loop counter */ + blkCnt--; + } + + /* Variance */ + *pResult = fSum / (float32_t)(blockSize - 1.0f); +} + +/** + * @} end of variance group + */ -- cgit