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author | Ali Labbene <ali.labbene@st.com> | 2019-12-11 08:59:21 +0100 |
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committer | Ali Labbene <ali.labbene@st.com> | 2019-12-16 16:35:24 +0100 |
commit | 9f95ff5b6ba01db09552b84a0ab79607060a2666 (patch) | |
tree | 8a6e0dda832555c692307869aed49d07ee7facfe /DSP_Lib/Source/FilteringFunctions/arm_fir_lattice_q31.c | |
parent | 76177aa280494bb36d7a0bcbda1078d4db717020 (diff) | |
download | st-cmsis-core-lowfat-9f95ff5b6ba01db09552b84a0ab79607060a2666.tar.gz st-cmsis-core-lowfat-9f95ff5b6ba01db09552b84a0ab79607060a2666.tar.bz2 st-cmsis-core-lowfat-9f95ff5b6ba01db09552b84a0ab79607060a2666.zip |
Official ARM version: v5.4.0
Add CMSIS V5.4.0, please refer to index.html available under \docs folder.
Note: content of \CMSIS\Core\Include has been copied under \Include to keep the same structure
used in existing projects, and thus avoid projects mass update
Note: the following components have been removed from ARM original delivery (as not used in ST packages)
- CMSIS_EW2018.pdf
- .gitattributes
- .gitignore
- \Device
- \CMSIS
- \CoreValidation
- \DAP
- \Documentation
- \DoxyGen
- \Driver
- \Pack
- \RTOS\CMSIS_RTOS_Tutorial.pdf
- \RTOS\RTX
- \RTOS\Template
- \RTOS2\RTX
- \Utilities
- All ARM/GCC projects files are deleted from \DSP, \RTOS and \RTOS2
Change-Id: Ia026c3f0f0d016627a4fb5a9032852c33d24b4d3
Diffstat (limited to 'DSP_Lib/Source/FilteringFunctions/arm_fir_lattice_q31.c')
-rw-r--r-- | DSP_Lib/Source/FilteringFunctions/arm_fir_lattice_q31.c | 353 |
1 files changed, 0 insertions, 353 deletions
diff --git a/DSP_Lib/Source/FilteringFunctions/arm_fir_lattice_q31.c b/DSP_Lib/Source/FilteringFunctions/arm_fir_lattice_q31.c deleted file mode 100644 index 4a64538..0000000 --- a/DSP_Lib/Source/FilteringFunctions/arm_fir_lattice_q31.c +++ /dev/null @@ -1,353 +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_fir_lattice_q31.c -* -* Description: Q31 FIR lattice filter processing function. -* -* 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 FIR_Lattice - * @{ - */ - - -/** - * @brief Processing function for the Q31 FIR lattice filter. - * @param[in] *S points to an instance of the Q31 FIR lattice structure. - * @param[in] *pSrc points to the block of input data. - * @param[out] *pDst points to the block of output data - * @param[in] blockSize number of samples to process. - * @return none. - * - * @details - * <b>Scaling and Overflow Behavior:</b> - * In order to avoid overflows the input signal must be scaled down by 2*log2(numStages) bits. - */ - -#ifndef ARM_MATH_CM0_FAMILY - - /* Run the below code for Cortex-M4 and Cortex-M3 */ - -void arm_fir_lattice_q31( - const arm_fir_lattice_instance_q31 * S, - q31_t * pSrc, - q31_t * pDst, - uint32_t blockSize) -{ - q31_t *pState; /* State pointer */ - q31_t *pCoeffs = S->pCoeffs; /* Coefficient pointer */ - q31_t *px; /* temporary state pointer */ - q31_t *pk; /* temporary coefficient pointer */ - q31_t fcurr1, fnext1, gcurr1 = 0, gnext1; /* temporary variables for first sample in loop unrolling */ - q31_t fcurr2, fnext2, gnext2; /* temporary variables for second sample in loop unrolling */ - uint32_t numStages = S->numStages; /* Length of the filter */ - uint32_t blkCnt, stageCnt; /* temporary variables for counts */ - q31_t k; - - pState = &S->pState[0]; - - blkCnt = blockSize >> 1u; - - /* First part of the processing with loop unrolling. Compute 2 outputs at a time. - a second loop below computes the remaining 1 sample. */ - while(blkCnt > 0u) - { - /* f0(n) = x(n) */ - fcurr1 = *pSrc++; - - /* f0(n) = x(n) */ - fcurr2 = *pSrc++; - - /* Initialize coeff pointer */ - pk = (pCoeffs); - - /* Initialize state pointer */ - px = pState; - - /* read g0(n - 1) from state buffer */ - gcurr1 = *px; - - /* Read the reflection coefficient */ - k = *pk++; - - /* for sample 1 processing */ - /* f1(n) = f0(n) + K1 * g0(n-1) */ - fnext1 = (q31_t) (((q63_t) gcurr1 * k) >> 32); - - /* g1(n) = f0(n) * K1 + g0(n-1) */ - gnext1 = (q31_t) (((q63_t) fcurr1 * (k)) >> 32); - fnext1 = fcurr1 + (fnext1 << 1u); - gnext1 = gcurr1 + (gnext1 << 1u); - - /* for sample 1 processing */ - /* f1(n) = f0(n) + K1 * g0(n-1) */ - fnext2 = (q31_t) (((q63_t) fcurr1 * k) >> 32); - - /* g1(n) = f0(n) * K1 + g0(n-1) */ - gnext2 = (q31_t) (((q63_t) fcurr2 * (k)) >> 32); - fnext2 = fcurr2 + (fnext2 << 1u); - gnext2 = fcurr1 + (gnext2 << 1u); - - /* save g1(n) in state buffer */ - *px++ = fcurr2; - - /* f1(n) is saved in fcurr1 - for next stage processing */ - fcurr1 = fnext1; - fcurr2 = fnext2; - - stageCnt = (numStages - 1u); - - /* stage loop */ - while(stageCnt > 0u) - { - - /* Read the reflection coefficient */ - k = *pk++; - - /* read g2(n) from state buffer */ - gcurr1 = *px; - - /* save g1(n) in state buffer */ - *px++ = gnext2; - - /* Sample processing for K2, K3.... */ - /* f2(n) = f1(n) + K2 * g1(n-1) */ - fnext1 = (q31_t) (((q63_t) gcurr1 * k) >> 32); - fnext2 = (q31_t) (((q63_t) gnext1 * k) >> 32); - - fnext1 = fcurr1 + (fnext1 << 1u); - fnext2 = fcurr2 + (fnext2 << 1u); - - /* g2(n) = f1(n) * K2 + g1(n-1) */ - gnext2 = (q31_t) (((q63_t) fcurr2 * (k)) >> 32); - gnext2 = gnext1 + (gnext2 << 1u); - - /* g2(n) = f1(n) * K2 + g1(n-1) */ - gnext1 = (q31_t) (((q63_t) fcurr1 * (k)) >> 32); - gnext1 = gcurr1 + (gnext1 << 1u); - - /* f1(n) is saved in fcurr1 - for next stage processing */ - fcurr1 = fnext1; - fcurr2 = fnext2; - - stageCnt--; - - } - - /* y(n) = fN(n) */ - *pDst++ = fcurr1; - *pDst++ = fcurr2; - - blkCnt--; - - } - - /* If the blockSize is not a multiple of 4, compute any remaining output samples here. - ** No loop unrolling is used. */ - blkCnt = blockSize % 0x2u; - - while(blkCnt > 0u) - { - /* f0(n) = x(n) */ - fcurr1 = *pSrc++; - - /* Initialize coeff pointer */ - pk = (pCoeffs); - - /* Initialize state pointer */ - px = pState; - - /* read g0(n - 1) from state buffer */ - gcurr1 = *px; - - /* Read the reflection coefficient */ - k = *pk++; - - /* for sample 1 processing */ - /* f1(n) = f0(n) + K1 * g0(n-1) */ - fnext1 = (q31_t) (((q63_t) gcurr1 * k) >> 32); - fnext1 = fcurr1 + (fnext1 << 1u); - - /* g1(n) = f0(n) * K1 + g0(n-1) */ - gnext1 = (q31_t) (((q63_t) fcurr1 * (k)) >> 32); - gnext1 = gcurr1 + (gnext1 << 1u); - - /* save g1(n) in state buffer */ - *px++ = fcurr1; - - /* f1(n) is saved in fcurr1 - for next stage processing */ - fcurr1 = fnext1; - - stageCnt = (numStages - 1u); - - /* stage loop */ - while(stageCnt > 0u) - { - /* Read the reflection coefficient */ - k = *pk++; - - /* read g2(n) from state buffer */ - gcurr1 = *px; - - /* save g1(n) in state buffer */ - *px++ = gnext1; - - /* Sample processing for K2, K3.... */ - /* f2(n) = f1(n) + K2 * g1(n-1) */ - fnext1 = (q31_t) (((q63_t) gcurr1 * k) >> 32); - fnext1 = fcurr1 + (fnext1 << 1u); - - /* g2(n) = f1(n) * K2 + g1(n-1) */ - gnext1 = (q31_t) (((q63_t) fcurr1 * (k)) >> 32); - gnext1 = gcurr1 + (gnext1 << 1u); - - /* f1(n) is saved in fcurr1 - for next stage processing */ - fcurr1 = fnext1; - - stageCnt--; - - } - - - /* y(n) = fN(n) */ - *pDst++ = fcurr1; - - blkCnt--; - - } - - -} - - -#else - -/* Run the below code for Cortex-M0 */ - -void arm_fir_lattice_q31( - const arm_fir_lattice_instance_q31 * S, - q31_t * pSrc, - q31_t * pDst, - uint32_t blockSize) -{ - q31_t *pState; /* State pointer */ - q31_t *pCoeffs = S->pCoeffs; /* Coefficient pointer */ - q31_t *px; /* temporary state pointer */ - q31_t *pk; /* temporary coefficient pointer */ - q31_t fcurr, fnext, gcurr, gnext; /* temporary variables */ - uint32_t numStages = S->numStages; /* Length of the filter */ - uint32_t blkCnt, stageCnt; /* temporary variables for counts */ - - pState = &S->pState[0]; - - blkCnt = blockSize; - - while(blkCnt > 0u) - { - /* f0(n) = x(n) */ - fcurr = *pSrc++; - - /* Initialize coeff pointer */ - pk = (pCoeffs); - - /* Initialize state pointer */ - px = pState; - - /* read g0(n-1) from state buffer */ - gcurr = *px; - - /* for sample 1 processing */ - /* f1(n) = f0(n) + K1 * g0(n-1) */ - fnext = (q31_t) (((q63_t) gcurr * (*pk)) >> 31) + fcurr; - /* g1(n) = f0(n) * K1 + g0(n-1) */ - gnext = (q31_t) (((q63_t) fcurr * (*pk++)) >> 31) + gcurr; - /* save g1(n) in state buffer */ - *px++ = fcurr; - - /* f1(n) is saved in fcurr1 - for next stage processing */ - fcurr = fnext; - - stageCnt = (numStages - 1u); - - /* stage loop */ - while(stageCnt > 0u) - { - /* read g2(n) from state buffer */ - gcurr = *px; - - /* save g1(n) in state buffer */ - *px++ = gnext; - - /* Sample processing for K2, K3.... */ - /* f2(n) = f1(n) + K2 * g1(n-1) */ - fnext = (q31_t) (((q63_t) gcurr * (*pk)) >> 31) + fcurr; - /* g2(n) = f1(n) * K2 + g1(n-1) */ - gnext = (q31_t) (((q63_t) fcurr * (*pk++)) >> 31) + gcurr; - - /* f1(n) is saved in fcurr1 - for next stage processing */ - fcurr = fnext; - - stageCnt--; - - } - - /* y(n) = fN(n) */ - *pDst++ = fcurr; - - blkCnt--; - - } - -} - -#endif /* #ifndef ARM_MATH_CM0_FAMILY */ - - -/** - * @} end of FIR_Lattice group - */ |