diff options
Diffstat (limited to 'apps/mathlib/CMSIS/DSP_Lib/Source/FilteringFunctions/arm_fir_decimate_q15.c')
| -rw-r--r-- | apps/mathlib/CMSIS/DSP_Lib/Source/FilteringFunctions/arm_fir_decimate_q15.c | 691 |
1 files changed, 0 insertions, 691 deletions
diff --git a/apps/mathlib/CMSIS/DSP_Lib/Source/FilteringFunctions/arm_fir_decimate_q15.c b/apps/mathlib/CMSIS/DSP_Lib/Source/FilteringFunctions/arm_fir_decimate_q15.c deleted file mode 100644 index 28b5f13dd..000000000 --- a/apps/mathlib/CMSIS/DSP_Lib/Source/FilteringFunctions/arm_fir_decimate_q15.c +++ /dev/null @@ -1,691 +0,0 @@ -/* ----------------------------------------------------------------------
-* Copyright (C) 2010 ARM Limited. All rights reserved.
-*
-* $Date: 15. February 2012
-* $Revision: V1.1.0
-*
-* Project: CMSIS DSP Library
-* Title: arm_fir_decimate_q15.c
-*
-* Description: Q15 FIR Decimator.
-*
-* 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 FIR_decimate
- * @{
- */
-
-/**
- * @brief Processing function for the Q15 FIR decimator.
- * @param[in] *S points to an instance of the Q15 FIR decimator structure.
- * @param[in] *pSrc points to the block of input data.
- * @param[out] *pDst points to the location where the output result is written.
- * @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.
- *
- * \par
- * Refer to the function <code>arm_fir_decimate_fast_q15()</code> for a faster but less precise implementation of this function for Cortex-M3 and Cortex-M4.
- */
-
-#ifndef ARM_MATH_CM0
-
-#ifndef UNALIGNED_SUPPORT_DISABLE
-
-void arm_fir_decimate_q15(
- const arm_fir_decimate_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 *px; /* Temporary pointer for state buffer */
- q15_t *pb; /* Temporary pointer coefficient buffer */
- q31_t x0, x1, c0, c1; /* Temporary variables to hold state and coefficient values */
- q63_t sum0; /* Accumulators */
- q63_t acc0, acc1;
- q15_t *px0, *px1;
- uint32_t blkCntN3;
- uint32_t numTaps = S->numTaps; /* Number of taps */
- uint32_t i, blkCnt, tapCnt, outBlockSize = blockSize / S->M; /* Loop counters */
-
-
- /* S->pState buffer contains previous frame (numTaps - 1) samples */
- /* pStateCurnt points to the location where the new input data should be written */
- pStateCurnt = S->pState + (numTaps - 1u);
-
-
- /* Total number of output samples to be computed */
- blkCnt = outBlockSize / 2;
- blkCntN3 = outBlockSize - (2 * blkCnt);
-
-
- while(blkCnt > 0u)
- {
- /* Copy decimation factor number of new input samples into the state buffer */
- i = 2 * S->M;
-
- do
- {
- *pStateCurnt++ = *pSrc++;
-
- } while(--i);
-
- /* Set accumulator to zero */
- acc0 = 0;
- acc1 = 0;
-
- /* Initialize state pointer */
- px0 = pState;
-
- px1 = pState + S->M;
-
-
- /* Initialize coeff pointer */
- pb = pCoeffs;
-
- /* Loop unrolling. Process 4 taps at a time. */
- tapCnt = numTaps >> 2;
-
- /* Loop over the number of taps. Unroll by a factor of 4.
- ** Repeat until we've computed numTaps-4 coefficients. */
- while(tapCnt > 0u)
- {
- /* Read the Read b[numTaps-1] and b[numTaps-2] coefficients */
- c0 = *__SIMD32(pb)++;
-
- /* Read x[n-numTaps-1] and x[n-numTaps-2]sample */
- x0 = *__SIMD32(px0)++;
-
- x1 = *__SIMD32(px1)++;
-
- /* Perform the multiply-accumulate */
- acc0 = __SMLALD(x0, c0, acc0);
-
- acc1 = __SMLALD(x1, c0, acc1);
-
- /* Read the b[numTaps-3] and b[numTaps-4] coefficient */
- c0 = *__SIMD32(pb)++;
-
- /* Read x[n-numTaps-2] and x[n-numTaps-3] sample */
- x0 = *__SIMD32(px0)++;
-
- x1 = *__SIMD32(px1)++;
-
- /* Perform the multiply-accumulate */
- acc0 = __SMLALD(x0, c0, acc0);
-
- acc1 = __SMLALD(x1, c0, acc1);
-
- /* 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)
- {
- /* Read coefficients */
- c0 = *pb++;
-
- /* Fetch 1 state variable */
- x0 = *px0++;
-
- x1 = *px1++;
-
- /* Perform the multiply-accumulate */
- acc0 = __SMLALD(x0, c0, acc0);
- acc1 = __SMLALD(x1, c0, acc1);
-
- /* Decrement the loop counter */
- tapCnt--;
- }
-
- /* Advance the state pointer by the decimation factor
- * to process the next group of decimation factor number samples */
- pState = pState + S->M * 2;
-
- /* Store filter output, smlad returns the values in 2.14 format */
- /* so downsacle by 15 to get output in 1.15 */
- *pDst++ = (q15_t) (__SSAT((acc0 >> 15), 16));
- *pDst++ = (q15_t) (__SSAT((acc1 >> 15), 16));
-
- /* Decrement the loop counter */
- blkCnt--;
- }
-
-
-
- while(blkCntN3 > 0u)
- {
- /* Copy decimation factor number of new input samples into the state buffer */
- i = S->M;
-
- do
- {
- *pStateCurnt++ = *pSrc++;
-
- } while(--i);
-
- /*Set sum to zero */
- sum0 = 0;
-
- /* Initialize state pointer */
- px = pState;
-
- /* Initialize coeff pointer */
- pb = pCoeffs;
-
- /* Loop unrolling. Process 4 taps at a time. */
- tapCnt = numTaps >> 2;
-
- /* Loop over the number of taps. Unroll by a factor of 4.
- ** Repeat until we've computed numTaps-4 coefficients. */
- while(tapCnt > 0u)
- {
- /* Read the Read b[numTaps-1] and b[numTaps-2] coefficients */
- c0 = *__SIMD32(pb)++;
-
- /* Read x[n-numTaps-1] and x[n-numTaps-2]sample */
- x0 = *__SIMD32(px)++;
-
- /* Read the b[numTaps-3] and b[numTaps-4] coefficient */
- c1 = *__SIMD32(pb)++;
-
- /* Perform the multiply-accumulate */
- sum0 = __SMLALD(x0, c0, sum0);
-
- /* Read x[n-numTaps-2] and x[n-numTaps-3] sample */
- x0 = *__SIMD32(px)++;
-
- /* Perform the multiply-accumulate */
- sum0 = __SMLALD(x0, c1, sum0);
-
- /* 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)
- {
- /* Read coefficients */
- c0 = *pb++;
-
- /* Fetch 1 state variable */
- x0 = *px++;
-
- /* Perform the multiply-accumulate */
- sum0 = __SMLALD(x0, c0, sum0);
-
- /* Decrement the loop counter */
- tapCnt--;
- }
-
- /* Advance the state pointer by the decimation factor
- * to process the next group of decimation factor number samples */
- pState = pState + S->M;
-
- /* Store filter output, smlad returns the values in 2.14 format */
- /* so downsacle by 15 to get output in 1.15 */
- *pDst++ = (q15_t) (__SSAT((sum0 >> 15), 16));
-
- /* Decrement the loop counter */
- blkCntN3--;
- }
-
- /* 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 state buffer */
- pStateCurnt = S->pState;
-
- i = (numTaps - 1u) >> 2u;
-
- /* copy data */
- while(i > 0u)
- {
- *__SIMD32(pStateCurnt)++ = *__SIMD32(pState)++;
- *__SIMD32(pStateCurnt)++ = *__SIMD32(pState)++;
-
- /* Decrement the loop counter */
- i--;
- }
-
- i = (numTaps - 1u) % 0x04u;
-
- /* copy data */
- while(i > 0u)
- {
- *pStateCurnt++ = *pState++;
-
- /* Decrement the loop counter */
- i--;
- }
-}
-
-#else
-
-
-void arm_fir_decimate_q15(
- const arm_fir_decimate_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 *px; /* Temporary pointer for state buffer */
- q15_t *pb; /* Temporary pointer coefficient buffer */
- q15_t x0, x1, c0; /* Temporary variables to hold state and coefficient values */
- q63_t sum0; /* Accumulators */
- q63_t acc0, acc1;
- q15_t *px0, *px1;
- uint32_t blkCntN3;
- uint32_t numTaps = S->numTaps; /* Number of taps */
- uint32_t i, blkCnt, tapCnt, outBlockSize = blockSize / S->M; /* Loop counters */
-
-
- /* S->pState buffer contains previous frame (numTaps - 1) samples */
- /* pStateCurnt points to the location where the new input data should be written */
- pStateCurnt = S->pState + (numTaps - 1u);
-
-
- /* Total number of output samples to be computed */
- blkCnt = outBlockSize / 2;
- blkCntN3 = outBlockSize - (2 * blkCnt);
-
- while(blkCnt > 0u)
- {
- /* Copy decimation factor number of new input samples into the state buffer */
- i = 2 * S->M;
-
- do
- {
- *pStateCurnt++ = *pSrc++;
-
- } while(--i);
-
- /* Set accumulator to zero */
- acc0 = 0;
- acc1 = 0;
-
- /* Initialize state pointer */
- px0 = pState;
-
- px1 = pState + S->M;
-
-
- /* Initialize coeff pointer */
- pb = pCoeffs;
-
- /* Loop unrolling. Process 4 taps at a time. */
- tapCnt = numTaps >> 2;
-
- /* Loop over the number of taps. Unroll by a factor of 4.
- ** Repeat until we've computed numTaps-4 coefficients. */
- while(tapCnt > 0u)
- {
- /* Read the Read b[numTaps-1] coefficients */
- c0 = *pb++;
-
- /* Read x[n-numTaps-1] for sample 0 and for sample 1 */
- x0 = *px0++;
- x1 = *px1++;
-
- /* Perform the multiply-accumulate */
- acc0 += x0 * c0;
- acc1 += x1 * c0;
-
- /* Read the b[numTaps-2] coefficient */
- c0 = *pb++;
-
- /* Read x[n-numTaps-2] for sample 0 and sample 1 */
- x0 = *px0++;
- x1 = *px1++;
-
- /* Perform the multiply-accumulate */
- acc0 += x0 * c0;
- acc1 += x1 * c0;
-
- /* Read the b[numTaps-3] coefficients */
- c0 = *pb++;
-
- /* Read x[n-numTaps-3] for sample 0 and sample 1 */
- x0 = *px0++;
- x1 = *px1++;
-
- /* Perform the multiply-accumulate */
- acc0 += x0 * c0;
- acc1 += x1 * c0;
-
- /* Read the b[numTaps-4] coefficient */
- c0 = *pb++;
-
- /* Read x[n-numTaps-4] for sample 0 and sample 1 */
- x0 = *px0++;
- x1 = *px1++;
-
- /* Perform the multiply-accumulate */
- acc0 += x0 * c0;
- acc1 += x1 * c0;
-
- /* 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)
- {
- /* Read coefficients */
- c0 = *pb++;
-
- /* Fetch 1 state variable */
- x0 = *px0++;
- x1 = *px1++;
-
- /* Perform the multiply-accumulate */
- acc0 += x0 * c0;
- acc1 += x1 * c0;
-
- /* Decrement the loop counter */
- tapCnt--;
- }
-
- /* Advance the state pointer by the decimation factor
- * to process the next group of decimation factor number samples */
- pState = pState + S->M * 2;
-
- /* Store filter output, smlad returns the values in 2.14 format */
- /* so downsacle by 15 to get output in 1.15 */
-
- *pDst++ = (q15_t) (__SSAT((acc0 >> 15), 16));
- *pDst++ = (q15_t) (__SSAT((acc1 >> 15), 16));
-
- /* Decrement the loop counter */
- blkCnt--;
- }
-
- while(blkCntN3 > 0u)
- {
- /* Copy decimation factor number of new input samples into the state buffer */
- i = S->M;
-
- do
- {
- *pStateCurnt++ = *pSrc++;
-
- } while(--i);
-
- /*Set sum to zero */
- sum0 = 0;
-
- /* Initialize state pointer */
- px = pState;
-
- /* Initialize coeff pointer */
- pb = pCoeffs;
-
- /* Loop unrolling. Process 4 taps at a time. */
- tapCnt = numTaps >> 2;
-
- /* Loop over the number of taps. Unroll by a factor of 4.
- ** Repeat until we've computed numTaps-4 coefficients. */
- while(tapCnt > 0u)
- {
- /* Read the Read b[numTaps-1] coefficients */
- c0 = *pb++;
-
- /* Read x[n-numTaps-1] and sample */
- x0 = *px++;
-
- /* Perform the multiply-accumulate */
- sum0 += x0 * c0;
-
- /* Read the b[numTaps-2] coefficient */
- c0 = *pb++;
-
- /* Read x[n-numTaps-2] and sample */
- x0 = *px++;
-
- /* Perform the multiply-accumulate */
- sum0 += x0 * c0;
-
- /* Read the b[numTaps-3] coefficients */
- c0 = *pb++;
-
- /* Read x[n-numTaps-3] sample */
- x0 = *px++;
-
- /* Perform the multiply-accumulate */
- sum0 += x0 * c0;
-
- /* Read the b[numTaps-4] coefficient */
- c0 = *pb++;
-
- /* Read x[n-numTaps-4] sample */
- x0 = *px++;
-
- /* Perform the multiply-accumulate */
- sum0 += x0 * c0;
-
- /* 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)
- {
- /* Read coefficients */
- c0 = *pb++;
-
- /* Fetch 1 state variable */
- x0 = *px++;
-
- /* Perform the multiply-accumulate */
- sum0 += x0 * c0;
-
- /* Decrement the loop counter */
- tapCnt--;
- }
-
- /* Advance the state pointer by the decimation factor
- * to process the next group of decimation factor number samples */
- pState = pState + S->M;
-
- /* Store filter output, smlad returns the values in 2.14 format */
- /* so downsacle by 15 to get output in 1.15 */
- *pDst++ = (q15_t) (__SSAT((sum0 >> 15), 16));
-
- /* Decrement the loop counter */
- blkCntN3--;
- }
-
- /* 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 state buffer */
- pStateCurnt = S->pState;
-
- i = (numTaps - 1u) >> 2u;
-
- /* copy data */
- while(i > 0u)
- {
- *pStateCurnt++ = *pState++;
- *pStateCurnt++ = *pState++;
- *pStateCurnt++ = *pState++;
- *pStateCurnt++ = *pState++;
-
- /* Decrement the loop counter */
- i--;
- }
-
- i = (numTaps - 1u) % 0x04u;
-
- /* copy data */
- while(i > 0u)
- {
- *pStateCurnt++ = *pState++;
-
- /* Decrement the loop counter */
- i--;
- }
-}
-
-
-#endif /* #ifndef UNALIGNED_SUPPORT_DISABLE */
-
-#else
-
-
-void arm_fir_decimate_q15(
- const arm_fir_decimate_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 *px; /* Temporary pointer for state buffer */
- q15_t *pb; /* Temporary pointer coefficient buffer */
- q31_t x0, c0; /* Temporary variables to hold state and coefficient values */
- q63_t sum0; /* Accumulators */
- uint32_t numTaps = S->numTaps; /* Number of taps */
- uint32_t i, blkCnt, tapCnt, outBlockSize = blockSize / S->M; /* Loop counters */
-
-
-
-/* Run the below code for Cortex-M0 */
-
- /* S->pState buffer contains previous frame (numTaps - 1) samples */
- /* pStateCurnt points to the location where the new input data should be written */
- pStateCurnt = S->pState + (numTaps - 1u);
-
- /* Total number of output samples to be computed */
- blkCnt = outBlockSize;
-
- while(blkCnt > 0u)
- {
- /* Copy decimation factor number of new input samples into the state buffer */
- i = S->M;
-
- do
- {
- *pStateCurnt++ = *pSrc++;
-
- } while(--i);
-
- /*Set sum to zero */
- sum0 = 0;
-
- /* Initialize state pointer */
- px = pState;
-
- /* Initialize coeff pointer */
- pb = pCoeffs;
-
- tapCnt = numTaps;
-
- while(tapCnt > 0u)
- {
- /* Read coefficients */
- c0 = *pb++;
-
- /* Fetch 1 state variable */
- x0 = *px++;
-
- /* Perform the multiply-accumulate */
- sum0 += (q31_t) x0 *c0;
-
- /* Decrement the loop counter */
- tapCnt--;
- }
-
- /* Advance the state pointer by the decimation factor
- * to process the next group of decimation factor number samples */
- pState = pState + S->M;
-
- /*Store filter output , smlad will return the values in 2.14 format */
- /* so downsacle by 15 to get output in 1.15 */
- *pDst++ = (q15_t) (__SSAT((sum0 >> 15), 16));
-
- /* 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 state buffer */
- pStateCurnt = S->pState;
-
- i = numTaps - 1u;
-
- /* copy data */
- while(i > 0u)
- {
- *pStateCurnt++ = *pState++;
-
- /* Decrement the loop counter */
- i--;
- }
-
-
-}
-#endif /* #ifndef ARM_MATH_CM0 */
-
-
-/**
- * @} end of FIR_decimate group
- */
|