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Diffstat (limited to 'DSP_Lib/Source/FilteringFunctions/arm_fir_interpolate_q15.c')
-rw-r--r-- | DSP_Lib/Source/FilteringFunctions/arm_fir_interpolate_q15.c | 508 |
1 files changed, 0 insertions, 508 deletions
diff --git a/DSP_Lib/Source/FilteringFunctions/arm_fir_interpolate_q15.c b/DSP_Lib/Source/FilteringFunctions/arm_fir_interpolate_q15.c deleted file mode 100644 index 34c085a..0000000 --- a/DSP_Lib/Source/FilteringFunctions/arm_fir_interpolate_q15.c +++ /dev/null @@ -1,508 +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_interpolate_q15.c -* -* Description: Q15 FIR interpolation. -* -* 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_Interpolate - * @{ - */ - -/** - * @brief Processing function for the Q15 FIR interpolator. - * @param[in] *S points to an instance of the Q15 FIR interpolator 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 input samples to process per call. - * @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. - */ - -#ifndef ARM_MATH_CM0_FAMILY - - /* Run the below code for Cortex-M4 and Cortex-M3 */ - -void arm_fir_interpolate_q15( - const arm_fir_interpolate_instance_q15 * S, - q15_t * pSrc, - q15_t * pDst, - 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 *ptr1, *ptr2; /* Temporary pointers for state and coefficient buffers */ - q63_t sum0; /* Accumulators */ - q15_t x0, c0; /* Temporary variables to hold state and coefficient values */ - uint32_t i, blkCnt, j, tapCnt; /* Loop counters */ - uint16_t phaseLen = S->phaseLength; /* Length of each polyphase filter component */ - uint32_t blkCntN2; - q63_t acc0, acc1; - q15_t x1; - - /* S->pState buffer contains previous frame (phaseLen - 1) samples */ - /* pStateCurnt points to the location where the new input data should be written */ - pStateCurnt = S->pState + ((q31_t) phaseLen - 1); - - /* Initialise blkCnt */ - blkCnt = blockSize / 2; - blkCntN2 = blockSize - (2 * blkCnt); - - /* Samples loop unrolled by 2 */ - while(blkCnt > 0u) - { - /* Copy new input sample into the state buffer */ - *pStateCurnt++ = *pSrc++; - *pStateCurnt++ = *pSrc++; - - /* Address modifier index of coefficient buffer */ - j = 1u; - - /* Loop over the Interpolation factor. */ - i = (S->L); - - while(i > 0u) - { - /* Set accumulator to zero */ - acc0 = 0; - acc1 = 0; - - /* Initialize state pointer */ - ptr1 = pState; - - /* Initialize coefficient pointer */ - ptr2 = pCoeffs + (S->L - j); - - /* Loop over the polyPhase length. Unroll by a factor of 4. - ** Repeat until we've computed numTaps-(4*S->L) coefficients. */ - tapCnt = phaseLen >> 2u; - - x0 = *(ptr1++); - - while(tapCnt > 0u) - { - - /* Read the input sample */ - x1 = *(ptr1++); - - /* Read the coefficient */ - c0 = *(ptr2); - - /* Perform the multiply-accumulate */ - acc0 += (q63_t) x0 *c0; - acc1 += (q63_t) x1 *c0; - - - /* Read the coefficient */ - c0 = *(ptr2 + S->L); - - /* Read the input sample */ - x0 = *(ptr1++); - - /* Perform the multiply-accumulate */ - acc0 += (q63_t) x1 *c0; - acc1 += (q63_t) x0 *c0; - - - /* Read the coefficient */ - c0 = *(ptr2 + S->L * 2); - - /* Read the input sample */ - x1 = *(ptr1++); - - /* Perform the multiply-accumulate */ - acc0 += (q63_t) x0 *c0; - acc1 += (q63_t) x1 *c0; - - /* Read the coefficient */ - c0 = *(ptr2 + S->L * 3); - - /* Read the input sample */ - x0 = *(ptr1++); - - /* Perform the multiply-accumulate */ - acc0 += (q63_t) x1 *c0; - acc1 += (q63_t) x0 *c0; - - - /* Upsampling is done by stuffing L-1 zeros between each sample. - * So instead of multiplying zeros with coefficients, - * Increment the coefficient pointer by interpolation factor times. */ - ptr2 += 4 * S->L; - - /* Decrement the loop counter */ - tapCnt--; - } - - /* If the polyPhase length is not a multiple of 4, compute the remaining filter taps */ - tapCnt = phaseLen % 0x4u; - - while(tapCnt > 0u) - { - - /* Read the input sample */ - x1 = *(ptr1++); - - /* Read the coefficient */ - c0 = *(ptr2); - - /* Perform the multiply-accumulate */ - acc0 += (q63_t) x0 *c0; - acc1 += (q63_t) x1 *c0; - - /* Increment the coefficient pointer by interpolation factor times. */ - ptr2 += S->L; - - /* update states for next sample processing */ - x0 = x1; - - /* Decrement the loop counter */ - tapCnt--; - } - - /* The result is in the accumulator, store in the destination buffer. */ - *pDst = (q15_t) (__SSAT((acc0 >> 15), 16)); - *(pDst + S->L) = (q15_t) (__SSAT((acc1 >> 15), 16)); - - pDst++; - - /* Increment the address modifier index of coefficient buffer */ - j++; - - /* Decrement the loop counter */ - i--; - } - - /* Advance the state pointer by 1 - * to process the next group of interpolation factor number samples */ - pState = pState + 2; - - pDst += S->L; - - /* Decrement the loop counter */ - blkCnt--; - } - - /* If the blockSize is not a multiple of 2, compute any remaining output samples here. - ** No loop unrolling is used. */ - blkCnt = blkCntN2; - - /* Loop over the blockSize. */ - while(blkCnt > 0u) - { - /* Copy new input sample into the state buffer */ - *pStateCurnt++ = *pSrc++; - - /* Address modifier index of coefficient buffer */ - j = 1u; - - /* Loop over the Interpolation factor. */ - i = S->L; - while(i > 0u) - { - /* Set accumulator to zero */ - sum0 = 0; - - /* Initialize state pointer */ - ptr1 = pState; - - /* Initialize coefficient pointer */ - ptr2 = pCoeffs + (S->L - j); - - /* Loop over the polyPhase length. Unroll by a factor of 4. - ** Repeat until we've computed numTaps-(4*S->L) coefficients. */ - tapCnt = phaseLen >> 2; - while(tapCnt > 0u) - { - - /* Read the coefficient */ - c0 = *(ptr2); - - /* Upsampling is done by stuffing L-1 zeros between each sample. - * So instead of multiplying zeros with coefficients, - * Increment the coefficient pointer by interpolation factor times. */ - ptr2 += S->L; - - /* Read the input sample */ - x0 = *(ptr1++); - - /* Perform the multiply-accumulate */ - sum0 += (q63_t) x0 *c0; - - /* Read the coefficient */ - c0 = *(ptr2); - - /* Increment the coefficient pointer by interpolation factor times. */ - ptr2 += S->L; - - /* Read the input sample */ - x0 = *(ptr1++); - - /* Perform the multiply-accumulate */ - sum0 += (q63_t) x0 *c0; - - /* Read the coefficient */ - c0 = *(ptr2); - - /* Increment the coefficient pointer by interpolation factor times. */ - ptr2 += S->L; - - /* Read the input sample */ - x0 = *(ptr1++); - - /* Perform the multiply-accumulate */ - sum0 += (q63_t) x0 *c0; - - /* Read the coefficient */ - c0 = *(ptr2); - - /* Increment the coefficient pointer by interpolation factor times. */ - ptr2 += S->L; - - /* Read the input sample */ - x0 = *(ptr1++); - - /* Perform the multiply-accumulate */ - sum0 += (q63_t) x0 *c0; - - /* Decrement the loop counter */ - tapCnt--; - } - - /* If the polyPhase length is not a multiple of 4, compute the remaining filter taps */ - tapCnt = phaseLen & 0x3u; - - while(tapCnt > 0u) - { - /* Read the coefficient */ - c0 = *(ptr2); - - /* Increment the coefficient pointer by interpolation factor times. */ - ptr2 += S->L; - - /* Read the input sample */ - x0 = *(ptr1++); - - /* Perform the multiply-accumulate */ - sum0 += (q63_t) x0 *c0; - - /* Decrement the loop counter */ - tapCnt--; - } - - /* The result is in the accumulator, store in the destination buffer. */ - *pDst++ = (q15_t) (__SSAT((sum0 >> 15), 16)); - - j++; - - /* Decrement the loop counter */ - i--; - } - - /* Advance the state pointer by 1 - * to process the next group of interpolation factor number samples */ - pState = pState + 1; - - /* Decrement the loop counter */ - blkCnt--; - } - - - /* Processing is complete. - ** Now copy the last phaseLen - 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 state buffer */ - pStateCurnt = S->pState; - - i = ((uint32_t) phaseLen - 1u) >> 2u; - - /* copy data */ - while(i > 0u) - { -#ifndef UNALIGNED_SUPPORT_DISABLE - - *__SIMD32(pStateCurnt)++ = *__SIMD32(pState)++; - *__SIMD32(pStateCurnt)++ = *__SIMD32(pState)++; - -#else - - *pStateCurnt++ = *pState++; - *pStateCurnt++ = *pState++; - *pStateCurnt++ = *pState++; - *pStateCurnt++ = *pState++; - -#endif /* #ifndef UNALIGNED_SUPPORT_DISABLE */ - - /* Decrement the loop counter */ - i--; - } - - i = ((uint32_t) phaseLen - 1u) % 0x04u; - - while(i > 0u) - { - *pStateCurnt++ = *pState++; - - /* Decrement the loop counter */ - i--; - } -} - -#else - - /* Run the below code for Cortex-M0 */ - -void arm_fir_interpolate_q15( - const arm_fir_interpolate_instance_q15 * S, - q15_t * pSrc, - q15_t * pDst, - 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 *ptr1, *ptr2; /* Temporary pointers for state and coefficient buffers */ - q63_t sum; /* Accumulator */ - q15_t x0, c0; /* Temporary variables to hold state and coefficient values */ - uint32_t i, blkCnt, tapCnt; /* Loop counters */ - uint16_t phaseLen = S->phaseLength; /* Length of each polyphase filter component */ - - - /* S->pState buffer contains previous frame (phaseLen - 1) samples */ - /* pStateCurnt points to the location where the new input data should be written */ - pStateCurnt = S->pState + (phaseLen - 1u); - - /* Total number of intput samples */ - blkCnt = blockSize; - - /* Loop over the blockSize. */ - while(blkCnt > 0u) - { - /* Copy new input sample into the state buffer */ - *pStateCurnt++ = *pSrc++; - - /* Loop over the Interpolation factor. */ - i = S->L; - - while(i > 0u) - { - /* Set accumulator to zero */ - sum = 0; - - /* Initialize state pointer */ - ptr1 = pState; - - /* Initialize coefficient pointer */ - ptr2 = pCoeffs + (i - 1u); - - /* Loop over the polyPhase length */ - tapCnt = (uint32_t) phaseLen; - - while(tapCnt > 0u) - { - /* Read the coefficient */ - c0 = *ptr2; - - /* Increment the coefficient pointer by interpolation factor times. */ - ptr2 += S->L; - - /* Read the input sample */ - x0 = *ptr1++; - - /* Perform the multiply-accumulate */ - sum += ((q31_t) x0 * c0); - - /* Decrement the loop counter */ - tapCnt--; - } - - /* Store the result after converting to 1.15 format in the destination buffer */ - *pDst++ = (q15_t) (__SSAT((sum >> 15), 16)); - - /* Decrement the loop counter */ - i--; - } - - /* Advance the state pointer by 1 - * to process the next group of interpolation factor number samples */ - pState = pState + 1; - - /* Decrement the loop counter */ - blkCnt--; - } - - /* Processing is complete. - ** Now copy the last phaseLen - 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 state buffer */ - pStateCurnt = S->pState; - - i = (uint32_t) phaseLen - 1u; - - while(i > 0u) - { - *pStateCurnt++ = *pState++; - - /* Decrement the loop counter */ - i--; - } - -} - -#endif /* #ifndef ARM_MATH_CM0_FAMILY */ - - - /** - * @} end of FIR_Interpolate group - */ |