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Diffstat (limited to 'Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_rms_f16.c')
| -rw-r--r-- | Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_rms_f16.c | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_rms_f16.c b/Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_rms_f16.c new file mode 100644 index 0000000..42a00ef --- /dev/null +++ b/Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_rms_f16.c @@ -0,0 +1,147 @@ +/* ---------------------------------------------------------------------- + * Project: CMSIS DSP Library + * Title: arm_rms_f16.c + * Description: Root mean square value of the elements of a floating-point vector + * + * $Date: 23 April 2021 + * $Revision: V1.9.0 + * + * Target Processor: Cortex-M and Cortex-A cores + * -------------------------------------------------------------------- */ +/* + * Copyright (C) 2010-2021 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 "dsp/statistics_functions_f16.h" + +#if defined(ARM_FLOAT16_SUPPORTED) + + +/** + @ingroup groupStats + */ + +/** + @defgroup RMS Root mean square (RMS) + + Calculates the Root Mean Square of the elements in the input vector. + The underlying algorithm is used: + + <pre> + Result = sqrt(((pSrc[0] * pSrc[0] + pSrc[1] * pSrc[1] + ... + pSrc[blockSize-1] * pSrc[blockSize-1]) / blockSize)); + </pre> + + There are separate functions for floating point, Q31, and Q15 data types. + */ + +/** + @addtogroup RMS + @{ + */ + +/** + @brief Root Mean Square of the elements of a floating-point vector. + @param[in] pSrc points to the input vector + @param[in] blockSize number of samples in input vector + @param[out] pResult root mean square value returned here + @return none + */ + +#if defined(ARM_MATH_MVE_FLOAT16) && !defined(ARM_MATH_AUTOVECTORIZE) + +void arm_rms_f16( + const float16_t * pSrc, + uint32_t blockSize, + float16_t * pResult) +{ + float16_t pow = 0.0f; + + arm_power_f16(pSrc, blockSize, &pow); + + /* Compute Rms and store the result in the destination */ + arm_sqrt_f16((_Float16)pow / (_Float16) blockSize, pResult); +} +#else + +void arm_rms_f16( + const float16_t * pSrc, + uint32_t blockSize, + float16_t * pResult) +{ + uint32_t blkCnt; /* Loop counter */ + _Float16 sum = 0.0f16; /* Temporary result storage */ + _Float16 in; /* Temporary variable to store input value */ + +#if defined (ARM_MATH_LOOPUNROLL) && !defined(ARM_MATH_AUTOVECTORIZE) + + /* Loop unrolling: Compute 4 outputs at a time */ + blkCnt = blockSize >> 2U; + + while (blkCnt > 0U) + { + /* C = A[0] * A[0] + A[1] * A[1] + ... + A[blockSize-1] * A[blockSize-1] */ + + in = *pSrc++; + /* Compute sum of squares and store result in a temporary variable, sum. */ + sum += in * in; + + in = *pSrc++; + sum += in * in; + + in = *pSrc++; + sum += in * in; + + in = *pSrc++; + sum += in * in; + + /* Decrement loop counter */ + blkCnt--; + } + + /* Loop unrolling: Compute remaining outputs */ + blkCnt = blockSize % 0x4U; + +#else + + /* Initialize blkCnt with number of samples */ + blkCnt = blockSize; + +#endif /* #if defined (ARM_MATH_LOOPUNROLL) */ + + while (blkCnt > 0U) + { + /* C = A[0] * A[0] + A[1] * A[1] + ... + A[blockSize-1] * A[blockSize-1] */ + + in = *pSrc++; + /* Compute sum of squares and store result in a temporary variable. */ + sum += ( in * in); + + /* Decrement loop counter */ + blkCnt--; + } + + /* Compute Rms and store result in destination */ + arm_sqrt_f16((_Float16)sum / (_Float16) blockSize, pResult); +} +#endif /* defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE) */ + +/** + @} end of RMS group + */ + +#endif /* #if defined(ARM_FLOAT16_SUPPORTED) */ + |