From 13fc6703862862f4263d8d5d085b7a16b87190e1 Mon Sep 17 00:00:00 2001 From: Lorenz Meier Date: Sun, 28 Apr 2013 09:54:11 +0200 Subject: Moved last libs, drivers and headers, cleaned up IO build --- .../Source/FilteringFunctions/arm_lms_norm_q15.c | 435 +++++++++++++++++++++ 1 file changed, 435 insertions(+) create mode 100644 src/modules/mathlib/CMSIS/DSP_Lib/Source/FilteringFunctions/arm_lms_norm_q15.c (limited to 'src/modules/mathlib/CMSIS/DSP_Lib/Source/FilteringFunctions/arm_lms_norm_q15.c') diff --git a/src/modules/mathlib/CMSIS/DSP_Lib/Source/FilteringFunctions/arm_lms_norm_q15.c b/src/modules/mathlib/CMSIS/DSP_Lib/Source/FilteringFunctions/arm_lms_norm_q15.c new file mode 100644 index 000000000..a1229a203 --- /dev/null +++ b/src/modules/mathlib/CMSIS/DSP_Lib/Source/FilteringFunctions/arm_lms_norm_q15.c @@ -0,0 +1,435 @@ +/* ---------------------------------------------------------------------- +* Copyright (C) 2010 ARM Limited. All rights reserved. +* +* $Date: 15. February 2012 +* $Revision: V1.1.0 +* +* Project: CMSIS DSP Library +* Title: arm_lms_norm_q15.c +* +* Description: Q15 NLMS filter. +* +* 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 +* +* Version 0.0.7 2010/06/10 +* Misra-C changes done +* -------------------------------------------------------------------- */ + +#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. +* +* Scaling and Overflow Behavior: +* \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 + + /* 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 */ + +} + + +/** + * @} end of LMS_NORM group + */ -- cgit v1.2.3