diff options
Diffstat (limited to 'src/modules/mathlib/CMSIS/DSP_Lib/Source/StatisticsFunctions/arm_rms_q31.c')
| -rw-r--r-- | src/modules/mathlib/CMSIS/DSP_Lib/Source/StatisticsFunctions/arm_rms_q31.c | 146 |
1 files changed, 0 insertions, 146 deletions
diff --git a/src/modules/mathlib/CMSIS/DSP_Lib/Source/StatisticsFunctions/arm_rms_q31.c b/src/modules/mathlib/CMSIS/DSP_Lib/Source/StatisticsFunctions/arm_rms_q31.c deleted file mode 100644 index 54038eb12..000000000 --- a/src/modules/mathlib/CMSIS/DSP_Lib/Source/StatisticsFunctions/arm_rms_q31.c +++ /dev/null @@ -1,146 +0,0 @@ -/* ----------------------------------------------------------------------
-* Copyright (C) 2010 ARM Limited. All rights reserved.
-*
-* $Date: 15. February 2012
-* $Revision: V1.1.0
-*
-* Project: CMSIS DSP Library
-* Title: arm_rms_q31.c
-*
-* Description: Root Mean Square of the elements of a Q31 vector.
-*
-* Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
-*
-* Version 1.1.0 2012/02/15
-* Updated with more optimizations, bug fixes and minor API changes.
-*
-* Version 1.0.10 2011/7/15
-* Big Endian support added and Merged M0 and M3/M4 Source code.
-*
-* Version 1.0.3 2010/11/29
-* Re-organized the CMSIS folders and updated documentation.
-*
-* Version 1.0.2 2010/11/11
-* Documentation updated.
-*
-* Version 1.0.1 2010/10/05
-* Production release and review comments incorporated.
-*
-* Version 1.0.0 2010/09/20
-* Production release and review comments incorporated.
-* ---------------------------------------------------------------------------- */
-
-#include "arm_math.h"
-
-/**
- * @addtogroup RMS
- * @{
- */
-
-
-/**
- * @brief Root Mean Square of the elements of a Q31 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 an internal 64-bit accumulator.
- * The input is represented in 1.31 format, and intermediate multiplication
- * yields a 2.62 format.
- * The accumulator maintains full precision of the intermediate multiplication results,
- * but provides only a single guard bit.
- * There is no saturation on intermediate additions.
- * If the accumulator overflows, it wraps around and distorts the result.
- * In order to avoid overflows completely, the input signal must be scaled down by
- * log2(blockSize) bits, as a total of blockSize additions are performed internally.
- * Finally, the 2.62 accumulator is right shifted by 31 bits to yield a 1.31 format value.
- *
- */
-
-void arm_rms_q31(
- q31_t * pSrc,
- uint32_t blockSize,
- q31_t * pResult)
-{
- q63_t sum = 0; /* accumulator */
- q31_t in; /* Temporary variable to store the input */
- uint32_t blkCnt; /* loop counter */
-
-#ifndef ARM_MATH_CM0
-
- /* Run the below code for Cortex-M4 and Cortex-M3 */
-
- q31_t in1, in2, in3, in4; /* Temporary input variables */
-
- /*loop Unrolling */
- blkCnt = blockSize >> 2u;
-
- /* First part of the processing with loop unrolling. Compute 8 outputs at a time.
- ** a second loop below computes the remaining 1 to 7 samples. */
- while(blkCnt > 0u)
- {
- /* C = A[0] * A[0] + A[1] * A[1] + A[2] * A[2] + ... + A[blockSize-1] * A[blockSize-1] */
- /* Compute sum of the squares and then store the result in a temporary variable, sum */
- /* read two samples from source buffer */
- in1 = pSrc[0];
- in2 = pSrc[1];
-
- /* calculate power and accumulate to accumulator */
- sum += (q63_t) in1 *in1;
- sum += (q63_t) in2 *in2;
-
- /* read two samples from source buffer */
- in3 = pSrc[2];
- in4 = pSrc[3];
-
- /* calculate power and accumulate to accumulator */
- sum += (q63_t) in3 *in3;
- sum += (q63_t) in4 *in4;
-
-
- /* update source buffer to process next samples */
- pSrc += 4u;
-
- /* Decrement the loop counter */
- blkCnt--;
- }
-
- /* If the blockSize is not a multiple of 8, compute any remaining output samples here.
- ** No loop unrolling is used. */
- blkCnt = blockSize % 0x4u;
-
-#else
-
- /* Run the below code for Cortex-M0 */
- blkCnt = blockSize;
-
-#endif /* #ifndef ARM_MATH_CM0 */
-
- while(blkCnt > 0u)
- {
- /* C = A[0] * A[0] + A[1] * A[1] + A[2] * A[2] + ... + A[blockSize-1] * A[blockSize-1] */
- /* Compute sum of the squares and then store the results in a temporary variable, sum */
- in = *pSrc++;
- sum += (q63_t) in *in;
-
- /* Decrement the loop counter */
- blkCnt--;
- }
-
- /* Convert data in 2.62 to 1.31 by 31 right shifts and saturate */
-
- sum = __SSAT(sum >> 31, 31);
-
-
- /* Compute Rms and store the result in the destination vector */
- arm_sqrt_q31((q31_t) ((q31_t) sum / (int32_t) blockSize), pResult);
-}
-
-/**
- * @} end of RMS group
- */
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