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Diffstat (limited to 'DSP_Lib/Source/StatisticsFunctions/arm_rms_q15.c')
| -rw-r--r-- | DSP_Lib/Source/StatisticsFunctions/arm_rms_q15.c | 153 |
1 files changed, 0 insertions, 153 deletions
diff --git a/DSP_Lib/Source/StatisticsFunctions/arm_rms_q15.c b/DSP_Lib/Source/StatisticsFunctions/arm_rms_q15.c deleted file mode 100644 index 3f335a2..0000000 --- a/DSP_Lib/Source/StatisticsFunctions/arm_rms_q15.c +++ /dev/null @@ -1,153 +0,0 @@ -/* ---------------------------------------------------------------------- -* Copyright (C) 2010-2014 ARM Limited. All rights reserved. -* -* $Date: 19. March 2015 -* $Revision: V.1.4.5 -* -* Project: CMSIS DSP Library -* Title: arm_rms_q15.c -* -* Description: Root Mean Square of the elements of a Q15 vector. -* -* Target Processor: Cortex-M4/Cortex-M3/Cortex-M0 -* -* Redistribution and use in source and binary forms, with or without -* modification, are permitted provided that the following conditions -* are met: -* - Redistributions of source code must retain the above copyright -* notice, this list of conditions and the following disclaimer. -* - Redistributions in binary form must reproduce the above copyright -* notice, this list of conditions and the following disclaimer in -* the documentation and/or other materials provided with the -* distribution. -* - Neither the name of ARM LIMITED nor the names of its contributors -* may be used to endorse or promote products derived from this -* software without specific prior written permission. -* -* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS -* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT -* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS -* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE -* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, -* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, -* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; -* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER -* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT -* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN -* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE -* POSSIBILITY OF SUCH DAMAGE. -* ---------------------------------------------------------------------------- */ - -#include "arm_math.h" - -/** - * @addtogroup RMS - * @{ - */ - -/** - * @brief Root Mean Square of the elements of a Q15 vector. - * @param[in] *pSrc points to the input vector - * @param[in] blockSize length of the input vector - * @param[out] *pResult rms value returned here - * @return none. - * - * @details - * <b>Scaling and Overflow Behavior:</b> - * - * \par - * The function is implemented using a 64-bit internal accumulator. - * The input is represented in 1.15 format. - * Intermediate multiplication yields a 2.30 format, and this - * result is added without saturation to a 64-bit accumulator in 34.30 format. - * With 33 guard bits in the accumulator, there is no risk of overflow, and the - * full precision of the intermediate multiplication is preserved. - * Finally, the 34.30 result is truncated to 34.15 format by discarding the lower - * 15 bits, and then saturated to yield a result in 1.15 format. - * - */ - -void arm_rms_q15( - q15_t * pSrc, - uint32_t blockSize, - q15_t * pResult) -{ - q63_t sum = 0; /* accumulator */ - -#ifndef ARM_MATH_CM0_FAMILY - - /* Run the below code for Cortex-M4 and Cortex-M3 */ - - q31_t in; /* temporary variable to store the input value */ - q15_t in1; /* temporary variable to store the input value */ - uint32_t blkCnt; /* loop counter */ - - /* 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[0] + A[1] * A[1] + ... + A[blockSize-1] * A[blockSize-1]) */ - /* Compute sum of the squares and then store the results in a temporary variable, sum */ - in = *__SIMD32(pSrc)++; - sum = __SMLALD(in, in, sum); - in = *__SIMD32(pSrc)++; - sum = __SMLALD(in, in, sum); - - /* 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; - - while(blkCnt > 0u) - { - /* C = (A[0] * A[0] + A[1] * A[1] + ... + A[blockSize-1] * A[blockSize-1]) */ - /* Compute sum of the squares and then store the results in a temporary variable, sum */ - in1 = *pSrc++; - sum = __SMLALD(in1, in1, sum); - - /* Decrement the loop counter */ - blkCnt--; - } - - /* Truncating and saturating the accumulator to 1.15 format */ - /* Store the result in the destination */ - arm_sqrt_q15(__SSAT((sum / (q63_t)blockSize) >> 15, 16), pResult); - -#else - - /* Run the below code for Cortex-M0 */ - - q15_t in; /* temporary variable to store the input value */ - uint32_t blkCnt; /* loop counter */ - - /* Loop over blockSize number of values */ - blkCnt = blockSize; - - while(blkCnt > 0u) - { - /* C = (A[0] * A[0] + A[1] * A[1] + ... + A[blockSize-1] * A[blockSize-1]) */ - /* Compute sum of the squares and then store the results in a temporary variable, sum */ - in = *pSrc++; - sum += ((q31_t) in * in); - - /* Decrement the loop counter */ - blkCnt--; - } - - /* Truncating and saturating the accumulator to 1.15 format */ - /* Store the result in the destination */ - arm_sqrt_q15(__SSAT((sum / (q63_t)blockSize) >> 15, 16), pResult); - -#endif /* #ifndef ARM_MATH_CM0_FAMILY */ - -} - -/** - * @} end of RMS group - */ |