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Diffstat (limited to 'DSP_Lib/Source/FilteringFunctions/arm_lms_norm_q15.c')
-rw-r--r-- | DSP_Lib/Source/FilteringFunctions/arm_lms_norm_q15.c | 440 |
1 files changed, 0 insertions, 440 deletions
diff --git a/DSP_Lib/Source/FilteringFunctions/arm_lms_norm_q15.c b/DSP_Lib/Source/FilteringFunctions/arm_lms_norm_q15.c deleted file mode 100644 index 208a9d8..0000000 --- a/DSP_Lib/Source/FilteringFunctions/arm_lms_norm_q15.c +++ /dev/null @@ -1,440 +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_lms_norm_q15.c -* -* Description: Q15 NLMS filter. -* -* 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" - -/** - * @ingroup groupFilters - */ - -/** - * @addtogroup LMS_NORM - * @{ - */ - -/** -* @brief Processing function for Q15 normalized LMS filter. -* @param[in] *S points to an instance of the Q15 normalized LMS filter structure. -* @param[in] *pSrc points to the block of input data. -* @param[in] *pRef points to the block of reference data. -* @param[out] *pOut points to the block of output data. -* @param[out] *pErr points to the block of error data. -* @param[in] blockSize number of samples to process. -* @return none. -* -* <b>Scaling and Overflow Behavior:</b> -* \par -* The function is implemented using a 64-bit internal accumulator. -* Both coefficients and state variables are represented in 1.15 format and -* multiplications yield a 2.30 result. The 2.30 intermediate results are -* accumulated in a 64-bit accumulator in 34.30 format. -* There is no risk of internal overflow with this approach and the full -* precision of intermediate multiplications is preserved. After all additions -* have been performed, the accumulator is truncated to 34.15 format by -* discarding low 15 bits. Lastly, the accumulator is saturated to yield a -* result in 1.15 format. -* -* \par -* In this filter, filter coefficients are updated for each sample and the updation of filter cofficients are saturted. -* - */ - -void arm_lms_norm_q15( - arm_lms_norm_instance_q15 * S, - q15_t * pSrc, - q15_t * pRef, - q15_t * pOut, - q15_t * pErr, - uint32_t blockSize) -{ - q15_t *pState = S->pState; /* State pointer */ - q15_t *pCoeffs = S->pCoeffs; /* Coefficient pointer */ - q15_t *pStateCurnt; /* Points to the current sample of the state */ - q15_t *px, *pb; /* Temporary pointers for state and coefficient buffers */ - q15_t mu = S->mu; /* Adaptive factor */ - uint32_t numTaps = S->numTaps; /* Number of filter coefficients in the filter */ - uint32_t tapCnt, blkCnt; /* Loop counters */ - q31_t energy; /* Energy of the input */ - q63_t acc; /* Accumulator */ - q15_t e = 0, d = 0; /* error, reference data sample */ - q15_t w = 0, in; /* weight factor and state */ - q15_t x0; /* temporary variable to hold input sample */ - //uint32_t shift = (uint32_t) S->postShift + 1u; /* Shift to be applied to the output */ - q15_t errorXmu, oneByEnergy; /* Temporary variables to store error and mu product and reciprocal of energy */ - q15_t postShift; /* Post shift to be applied to weight after reciprocal calculation */ - q31_t coef; /* Teporary variable for coefficient */ - q31_t acc_l, acc_h; - int32_t lShift = (15 - (int32_t) S->postShift); /* Post shift */ - int32_t uShift = (32 - lShift); - - energy = S->energy; - x0 = S->x0; - - /* S->pState points to buffer which contains previous frame (numTaps - 1) samples */ - /* pStateCurnt points to the location where the new input data should be written */ - pStateCurnt = &(S->pState[(numTaps - 1u)]); - - /* Loop over blockSize number of values */ - blkCnt = blockSize; - - -#ifndef ARM_MATH_CM0_FAMILY - - /* Run the below code for Cortex-M4 and Cortex-M3 */ - - while(blkCnt > 0u) - { - /* Copy the new input sample into the state buffer */ - *pStateCurnt++ = *pSrc; - - /* Initialize pState pointer */ - px = pState; - - /* Initialize coeff pointer */ - pb = (pCoeffs); - - /* Read the sample from input buffer */ - in = *pSrc++; - - /* Update the energy calculation */ - energy -= (((q31_t) x0 * (x0)) >> 15); - energy += (((q31_t) in * (in)) >> 15); - - /* Set the accumulator to zero */ - acc = 0; - - /* Loop unrolling. Process 4 taps at a time. */ - tapCnt = numTaps >> 2; - - while(tapCnt > 0u) - { - - /* Perform the multiply-accumulate */ -#ifndef UNALIGNED_SUPPORT_DISABLE - - acc = __SMLALD(*__SIMD32(px)++, (*__SIMD32(pb)++), acc); - acc = __SMLALD(*__SIMD32(px)++, (*__SIMD32(pb)++), acc); - -#else - - acc += (((q31_t) * px++ * (*pb++))); - acc += (((q31_t) * px++ * (*pb++))); - acc += (((q31_t) * px++ * (*pb++))); - acc += (((q31_t) * px++ * (*pb++))); - -#endif /* #ifndef UNALIGNED_SUPPORT_DISABLE */ - - /* Decrement the loop counter */ - tapCnt--; - } - - /* If the filter length is not a multiple of 4, compute the remaining filter taps */ - tapCnt = numTaps % 0x4u; - - while(tapCnt > 0u) - { - /* Perform the multiply-accumulate */ - acc += (((q31_t) * px++ * (*pb++))); - - /* Decrement the loop counter */ - tapCnt--; - } - - /* Calc lower part of acc */ - acc_l = acc & 0xffffffff; - - /* Calc upper part of acc */ - acc_h = (acc >> 32) & 0xffffffff; - - /* Apply shift for lower part of acc and upper part of acc */ - acc = (uint32_t) acc_l >> lShift | acc_h << uShift; - - /* Converting the result to 1.15 format and saturate the output */ - acc = __SSAT(acc, 16u); - - /* Store the result from accumulator into the destination buffer. */ - *pOut++ = (q15_t) acc; - - /* Compute and store error */ - d = *pRef++; - e = d - (q15_t) acc; - *pErr++ = e; - - /* Calculation of 1/energy */ - postShift = arm_recip_q15((q15_t) energy + DELTA_Q15, - &oneByEnergy, S->recipTable); - - /* Calculation of e * mu value */ - errorXmu = (q15_t) (((q31_t) e * mu) >> 15); - - /* Calculation of (e * mu) * (1/energy) value */ - acc = (((q31_t) errorXmu * oneByEnergy) >> (15 - postShift)); - - /* Weighting factor for the normalized version */ - w = (q15_t) __SSAT((q31_t) acc, 16); - - /* Initialize pState pointer */ - px = pState; - - /* Initialize coeff pointer */ - pb = (pCoeffs); - - /* Loop unrolling. Process 4 taps at a time. */ - tapCnt = numTaps >> 2; - - /* Update filter coefficients */ - while(tapCnt > 0u) - { - coef = *pb + (((q31_t) w * (*px++)) >> 15); - *pb++ = (q15_t) __SSAT((coef), 16); - coef = *pb + (((q31_t) w * (*px++)) >> 15); - *pb++ = (q15_t) __SSAT((coef), 16); - coef = *pb + (((q31_t) w * (*px++)) >> 15); - *pb++ = (q15_t) __SSAT((coef), 16); - coef = *pb + (((q31_t) w * (*px++)) >> 15); - *pb++ = (q15_t) __SSAT((coef), 16); - - /* Decrement the loop counter */ - tapCnt--; - } - - /* If the filter length is not a multiple of 4, compute the remaining filter taps */ - tapCnt = numTaps % 0x4u; - - while(tapCnt > 0u) - { - /* Perform the multiply-accumulate */ - coef = *pb + (((q31_t) w * (*px++)) >> 15); - *pb++ = (q15_t) __SSAT((coef), 16); - - /* Decrement the loop counter */ - tapCnt--; - } - - /* Read the sample from state buffer */ - x0 = *pState; - - /* Advance state pointer by 1 for the next sample */ - pState = pState + 1u; - - /* Decrement the loop counter */ - blkCnt--; - } - - /* Save energy and x0 values for the next frame */ - S->energy = (q15_t) energy; - S->x0 = x0; - - /* Processing is complete. Now copy the last numTaps - 1 samples to the - satrt of the state buffer. This prepares the state buffer for the - next function call. */ - - /* Points to the start of the pState buffer */ - pStateCurnt = S->pState; - - /* Calculation of count for copying integer writes */ - tapCnt = (numTaps - 1u) >> 2; - - while(tapCnt > 0u) - { - -#ifndef UNALIGNED_SUPPORT_DISABLE - - *__SIMD32(pStateCurnt)++ = *__SIMD32(pState)++; - *__SIMD32(pStateCurnt)++ = *__SIMD32(pState)++; - -#else - - *pStateCurnt++ = *pState++; - *pStateCurnt++ = *pState++; - *pStateCurnt++ = *pState++; - *pStateCurnt++ = *pState++; - -#endif - - tapCnt--; - - } - - /* Calculation of count for remaining q15_t data */ - tapCnt = (numTaps - 1u) % 0x4u; - - /* copy data */ - while(tapCnt > 0u) - { - *pStateCurnt++ = *pState++; - - /* Decrement the loop counter */ - tapCnt--; - } - -#else - - /* Run the below code for Cortex-M0 */ - - while(blkCnt > 0u) - { - /* Copy the new input sample into the state buffer */ - *pStateCurnt++ = *pSrc; - - /* Initialize pState pointer */ - px = pState; - - /* Initialize pCoeffs pointer */ - pb = pCoeffs; - - /* Read the sample from input buffer */ - in = *pSrc++; - - /* Update the energy calculation */ - energy -= (((q31_t) x0 * (x0)) >> 15); - energy += (((q31_t) in * (in)) >> 15); - - /* Set the accumulator to zero */ - acc = 0; - - /* Loop over numTaps number of values */ - tapCnt = numTaps; - - while(tapCnt > 0u) - { - /* Perform the multiply-accumulate */ - acc += (((q31_t) * px++ * (*pb++))); - - /* Decrement the loop counter */ - tapCnt--; - } - - /* Calc lower part of acc */ - acc_l = acc & 0xffffffff; - - /* Calc upper part of acc */ - acc_h = (acc >> 32) & 0xffffffff; - - /* Apply shift for lower part of acc and upper part of acc */ - acc = (uint32_t) acc_l >> lShift | acc_h << uShift; - - /* Converting the result to 1.15 format and saturate the output */ - acc = __SSAT(acc, 16u); - - /* Converting the result to 1.15 format */ - //acc = __SSAT((acc >> (16u - shift)), 16u); - - /* Store the result from accumulator into the destination buffer. */ - *pOut++ = (q15_t) acc; - - /* Compute and store error */ - d = *pRef++; - e = d - (q15_t) acc; - *pErr++ = e; - - /* Calculation of 1/energy */ - postShift = arm_recip_q15((q15_t) energy + DELTA_Q15, - &oneByEnergy, S->recipTable); - - /* Calculation of e * mu value */ - errorXmu = (q15_t) (((q31_t) e * mu) >> 15); - - /* Calculation of (e * mu) * (1/energy) value */ - acc = (((q31_t) errorXmu * oneByEnergy) >> (15 - postShift)); - - /* Weighting factor for the normalized version */ - w = (q15_t) __SSAT((q31_t) acc, 16); - - /* Initialize pState pointer */ - px = pState; - - /* Initialize coeff pointer */ - pb = (pCoeffs); - - /* Loop over numTaps number of values */ - tapCnt = numTaps; - - while(tapCnt > 0u) - { - /* Perform the multiply-accumulate */ - coef = *pb + (((q31_t) w * (*px++)) >> 15); - *pb++ = (q15_t) __SSAT((coef), 16); - - /* Decrement the loop counter */ - tapCnt--; - } - - /* Read the sample from state buffer */ - x0 = *pState; - - /* Advance state pointer by 1 for the next sample */ - pState = pState + 1u; - - /* Decrement the loop counter */ - blkCnt--; - } - - /* Save energy and x0 values for the next frame */ - S->energy = (q15_t) energy; - S->x0 = x0; - - /* Processing is complete. Now copy the last numTaps - 1 samples to the - satrt of the state buffer. This prepares the state buffer for the - next function call. */ - - /* Points to the start of the pState buffer */ - pStateCurnt = S->pState; - - /* copy (numTaps - 1u) data */ - tapCnt = (numTaps - 1u); - - /* copy data */ - while(tapCnt > 0u) - { - *pStateCurnt++ = *pState++; - - /* Decrement the loop counter */ - tapCnt--; - } - -#endif /* #ifndef ARM_MATH_CM0_FAMILY */ - -} - - -/** - * @} end of LMS_NORM group - */ |