diff options
Diffstat (limited to 'fw/hid-dials/Drivers/CMSIS/DSP/Source/FilteringFunctions/arm_lms_q31.c')
| -rw-r--r-- | fw/hid-dials/Drivers/CMSIS/DSP/Source/FilteringFunctions/arm_lms_q31.c | 357 |
1 files changed, 0 insertions, 357 deletions
diff --git a/fw/hid-dials/Drivers/CMSIS/DSP/Source/FilteringFunctions/arm_lms_q31.c b/fw/hid-dials/Drivers/CMSIS/DSP/Source/FilteringFunctions/arm_lms_q31.c deleted file mode 100644 index 66b2a91..0000000 --- a/fw/hid-dials/Drivers/CMSIS/DSP/Source/FilteringFunctions/arm_lms_q31.c +++ /dev/null @@ -1,357 +0,0 @@ -/* ----------------------------------------------------------------------
- * Project: CMSIS DSP Library
- * Title: arm_lms_q31.c
- * Description: Processing function for the Q31 LMS filter
- *
- * $Date: 27. January 2017
- * $Revision: V.1.5.1
- *
- * Target Processor: Cortex-M cores
- * -------------------------------------------------------------------- */
-/*
- * Copyright (C) 2010-2017 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 "arm_math.h"
-/**
- * @ingroup groupFilters
- */
-
-/**
- * @addtogroup LMS
- * @{
- */
-
- /**
- * @brief Processing function for Q31 LMS filter.
- * @param[in] *S points to an instance of the Q15 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.
- *
- * \par Scaling and Overflow Behavior:
- * The function is implemented using an internal 64-bit accumulator.
- * The accumulator has a 2.62 format and maintains full precision of the intermediate
- * multiplication results but provides only a single guard bit.
- * Thus, if the accumulator result overflows it wraps around rather than clips.
- * In order to avoid overflows completely the input signal must be scaled down by
- * log2(numTaps) bits.
- * The reference signal should not be scaled down.
- * After all multiply-accumulates are performed, the 2.62 accumulator is shifted
- * and saturated to 1.31 format to yield the final result.
- * The output signal and error signal are in 1.31 format.
- *
- * \par
- * In this filter, filter coefficients are updated for each sample and the updation of filter cofficients are saturted.
- */
-
-void arm_lms_q31(
- const arm_lms_instance_q31 * S,
- q31_t * pSrc,
- q31_t * pRef,
- q31_t * pOut,
- q31_t * pErr,
- uint32_t blockSize)
-{
- q31_t *pState = S->pState; /* State pointer */
- uint32_t numTaps = S->numTaps; /* Number of filter coefficients in the filter */
- q31_t *pCoeffs = S->pCoeffs; /* Coefficient pointer */
- q31_t *pStateCurnt; /* Points to the current sample of the state */
- q31_t mu = S->mu; /* Adaptive factor */
- q31_t *px; /* Temporary pointer for state */
- q31_t *pb; /* Temporary pointer for coefficient buffer */
- uint32_t tapCnt, blkCnt; /* Loop counters */
- q63_t acc; /* Accumulator */
- q31_t e = 0; /* error of data sample */
- q31_t alpha; /* Intermediate constant for taps update */
- q31_t coef; /* Temporary variable for coef */
- q31_t acc_l, acc_h; /* temporary input */
- uint32_t uShift = ((uint32_t) S->postShift + 1U);
- uint32_t lShift = 32U - uShift; /* Shift to be applied to the output */
-
- /* 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)]);
-
- /* Initializing blkCnt with blockSize */
- blkCnt = blockSize;
-
-
-#if defined (ARM_MATH_DSP)
-
- /* 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 state pointer */
- px = pState;
-
- /* Initialize coefficient pointer */
- pb = pCoeffs;
-
- /* 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 */
- /* acc += b[N] * x[n-N] */
- acc += ((q63_t) (*px++)) * (*pb++);
-
- /* acc += b[N-1] * x[n-N-1] */
- acc += ((q63_t) (*px++)) * (*pb++);
-
- /* acc += b[N-2] * x[n-N-2] */
- acc += ((q63_t) (*px++)) * (*pb++);
-
- /* acc += b[N-3] * x[n-N-3] */
- acc += ((q63_t) (*px++)) * (*pb++);
-
- /* 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 += ((q63_t) (*px++)) * (*pb++);
-
- /* Decrement the loop counter */
- tapCnt--;
- }
-
- /* Converting the result to 1.31 format */
- /* Calc lower part of acc */
- acc_l = acc & 0xffffffff;
-
- /* Calc upper part of acc */
- acc_h = (acc >> 32) & 0xffffffff;
-
- acc = (uint32_t) acc_l >> lShift | acc_h << uShift;
-
- /* Store the result from accumulator into the destination buffer. */
- *pOut++ = (q31_t) acc;
-
- /* Compute and store error */
- e = *pRef++ - (q31_t) acc;
-
- *pErr++ = (q31_t) e;
-
- /* Compute alpha i.e. intermediate constant for taps update */
- alpha = (q31_t) (((q63_t) e * mu) >> 31);
-
- /* Initialize state pointer */
- /* Advance state pointer by 1 for the next sample */
- px = pState++;
-
- /* Initialize coefficient pointer */
- pb = pCoeffs;
-
- /* Loop unrolling. Process 4 taps at a time. */
- tapCnt = numTaps >> 2;
-
- /* Update filter coefficients */
- while (tapCnt > 0U)
- {
- /* coef is in 2.30 format */
- coef = (q31_t) (((q63_t) alpha * (*px++)) >> (32));
- /* get coef in 1.31 format by left shifting */
- *pb = clip_q63_to_q31((q63_t) * pb + (coef << 1U));
- /* update coefficient buffer to next coefficient */
- pb++;
-
- coef = (q31_t) (((q63_t) alpha * (*px++)) >> (32));
- *pb = clip_q63_to_q31((q63_t) * pb + (coef << 1U));
- pb++;
-
- coef = (q31_t) (((q63_t) alpha * (*px++)) >> (32));
- *pb = clip_q63_to_q31((q63_t) * pb + (coef << 1U));
- pb++;
-
- coef = (q31_t) (((q63_t) alpha * (*px++)) >> (32));
- *pb = clip_q63_to_q31((q63_t) * pb + (coef << 1U));
- pb++;
-
- /* 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 = (q31_t) (((q63_t) alpha * (*px++)) >> (32));
- *pb = clip_q63_to_q31((q63_t) * pb + (coef << 1U));
- pb++;
-
- /* Decrement the loop counter */
- tapCnt--;
- }
-
- /* Decrement the loop counter */
- blkCnt--;
- }
-
- /* 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;
-
- /* Loop unrolling for (numTaps - 1U) samples copy */
- tapCnt = (numTaps - 1U) >> 2U;
-
- /* copy data */
- while (tapCnt > 0U)
- {
- *pStateCurnt++ = *pState++;
- *pStateCurnt++ = *pState++;
- *pStateCurnt++ = *pState++;
- *pStateCurnt++ = *pState++;
-
- /* Decrement the loop counter */
- tapCnt--;
- }
-
- /* Calculate remaining number of copies */
- tapCnt = (numTaps - 1U) % 0x4U;
-
- /* Copy the remaining q31_t 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;
-
- /* Set the accumulator to zero */
- acc = 0;
-
- /* Loop over numTaps number of values */
- tapCnt = numTaps;
-
- while (tapCnt > 0U)
- {
- /* Perform the multiply-accumulate */
- acc += ((q63_t) (*px++)) * (*pb++);
-
- /* Decrement the loop counter */
- tapCnt--;
- }
-
- /* Converting the result to 1.31 format */
- /* Store the result from accumulator into the destination buffer. */
- /* Calc lower part of acc */
- acc_l = acc & 0xffffffff;
-
- /* Calc upper part of acc */
- acc_h = (acc >> 32) & 0xffffffff;
-
- acc = (uint32_t) acc_l >> lShift | acc_h << uShift;
-
- *pOut++ = (q31_t) acc;
-
- /* Compute and store error */
- e = *pRef++ - (q31_t) acc;
-
- *pErr++ = (q31_t) e;
-
- /* Weighting factor for the LMS version */
- alpha = (q31_t) (((q63_t) e * mu) >> 31);
-
- /* Initialize pState pointer */
- /* Advance state pointer by 1 for the next sample */
- px = pState++;
-
- /* Initialize pCoeffs pointer */
- pb = pCoeffs;
-
- /* Loop over numTaps number of values */
- tapCnt = numTaps;
-
- while (tapCnt > 0U)
- {
- /* Perform the multiply-accumulate */
- coef = (q31_t) (((q63_t) alpha * (*px++)) >> (32));
- *pb = clip_q63_to_q31((q63_t) * pb + (coef << 1U));
- pb++;
-
- /* Decrement the loop counter */
- tapCnt--;
- }
-
- /* Decrement the loop counter */
- blkCnt--;
- }
-
- /* Processing is complete. Now copy the last numTaps - 1 samples to the
- start 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) samples */
- tapCnt = (numTaps - 1U);
-
- /* Copy the data */
- while (tapCnt > 0U)
- {
- *pStateCurnt++ = *pState++;
-
- /* Decrement the loop counter */
- tapCnt--;
- }
-
-#endif /* #if defined (ARM_MATH_DSP) */
-
-}
-
-/**
- * @} end of LMS group
- */
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