diff options
Diffstat (limited to 'Drivers/CMSIS/DSP/Source/FilteringFunctions/arm_biquad_cascade_stereo_df2T_f32.c')
| -rw-r--r-- | Drivers/CMSIS/DSP/Source/FilteringFunctions/arm_biquad_cascade_stereo_df2T_f32.c | 285 |
1 files changed, 285 insertions, 0 deletions
diff --git a/Drivers/CMSIS/DSP/Source/FilteringFunctions/arm_biquad_cascade_stereo_df2T_f32.c b/Drivers/CMSIS/DSP/Source/FilteringFunctions/arm_biquad_cascade_stereo_df2T_f32.c new file mode 100644 index 0000000..1b97262 --- /dev/null +++ b/Drivers/CMSIS/DSP/Source/FilteringFunctions/arm_biquad_cascade_stereo_df2T_f32.c @@ -0,0 +1,285 @@ +/* ----------------------------------------------------------------------
+ * Project: CMSIS DSP Library
+ * Title: arm_biquad_cascade_stereo_df2T_f32.c
+ * Description: Processing function for floating-point transposed direct form II Biquad cascade filter. 2 channels
+ *
+ * $Date: 18. March 2019
+ * $Revision: V1.6.0
+ *
+ * Target Processor: Cortex-M cores
+ * -------------------------------------------------------------------- */
+/*
+ * Copyright (C) 2010-2019 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 BiquadCascadeDF2T
+ @{
+ */
+
+/**
+ @brief Processing function for the floating-point transposed direct form II Biquad cascade filter.
+ @param[in] S points to an instance of the filter data 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
+ */
+
+LOW_OPTIMIZATION_ENTER
+void arm_biquad_cascade_stereo_df2T_f32(
+ const arm_biquad_cascade_stereo_df2T_instance_f32 * S,
+ const float32_t * pSrc,
+ float32_t * pDst,
+ uint32_t blockSize)
+{
+ const float32_t *pIn = pSrc; /* Source pointer */
+ float32_t *pOut = pDst; /* Destination pointer */
+ float32_t *pState = S->pState; /* State pointer */
+ const float32_t *pCoeffs = S->pCoeffs; /* Coefficient pointer */
+ float32_t acc1a, acc1b; /* Accumulator */
+ float32_t b0, b1, b2, a1, a2; /* Filter coefficients */
+ float32_t Xn1a, Xn1b; /* Temporary input */
+ float32_t d1a, d2a, d1b, d2b; /* State variables */
+ uint32_t sample, stage = S->numStages; /* Loop counters */
+
+ do
+ {
+ /* Reading the coefficients */
+ b0 = pCoeffs[0];
+ b1 = pCoeffs[1];
+ b2 = pCoeffs[2];
+ a1 = pCoeffs[3];
+ a2 = pCoeffs[4];
+
+ /* Reading the state values */
+ d1a = pState[0];
+ d2a = pState[1];
+ d1b = pState[2];
+ d2b = pState[3];
+
+ pCoeffs += 5U;
+
+#if defined (ARM_MATH_LOOPUNROLL)
+
+ /* Loop unrolling: Compute 8 outputs at a time */
+ sample = blockSize >> 3U;
+
+ while (sample > 0U) {
+ /* y[n] = b0 * x[n] + d1 */
+ /* d1 = b1 * x[n] + a1 * y[n] + d2 */
+ /* d2 = b2 * x[n] + a2 * y[n] */
+
+/* 1 */
+ Xn1a = *pIn++; /* Channel a */
+ Xn1b = *pIn++; /* Channel b */
+
+ acc1a = (b0 * Xn1a) + d1a;
+ acc1b = (b0 * Xn1b) + d1b;
+
+ *pOut++ = acc1a;
+ *pOut++ = acc1b;
+
+ d1a = ((b1 * Xn1a) + (a1 * acc1a)) + d2a;
+ d1b = ((b1 * Xn1b) + (a1 * acc1b)) + d2b;
+
+ d2a = (b2 * Xn1a) + (a2 * acc1a);
+ d2b = (b2 * Xn1b) + (a2 * acc1b);
+
+/* 2 */
+ Xn1a = *pIn++; /* Channel a */
+ Xn1b = *pIn++; /* Channel b */
+
+ acc1a = (b0 * Xn1a) + d1a;
+ acc1b = (b0 * Xn1b) + d1b;
+
+ *pOut++ = acc1a;
+ *pOut++ = acc1b;
+
+ d1a = ((b1 * Xn1a) + (a1 * acc1a)) + d2a;
+ d1b = ((b1 * Xn1b) + (a1 * acc1b)) + d2b;
+
+ d2a = (b2 * Xn1a) + (a2 * acc1a);
+ d2b = (b2 * Xn1b) + (a2 * acc1b);
+
+/* 3 */
+ Xn1a = *pIn++; /* Channel a */
+ Xn1b = *pIn++; /* Channel b */
+
+ acc1a = (b0 * Xn1a) + d1a;
+ acc1b = (b0 * Xn1b) + d1b;
+
+ *pOut++ = acc1a;
+ *pOut++ = acc1b;
+
+ d1a = ((b1 * Xn1a) + (a1 * acc1a)) + d2a;
+ d1b = ((b1 * Xn1b) + (a1 * acc1b)) + d2b;
+
+ d2a = (b2 * Xn1a) + (a2 * acc1a);
+ d2b = (b2 * Xn1b) + (a2 * acc1b);
+
+/* 4 */
+ Xn1a = *pIn++; /* Channel a */
+ Xn1b = *pIn++; /* Channel b */
+
+ acc1a = (b0 * Xn1a) + d1a;
+ acc1b = (b0 * Xn1b) + d1b;
+
+ *pOut++ = acc1a;
+ *pOut++ = acc1b;
+
+ d1a = ((b1 * Xn1a) + (a1 * acc1a)) + d2a;
+ d1b = ((b1 * Xn1b) + (a1 * acc1b)) + d2b;
+
+ d2a = (b2 * Xn1a) + (a2 * acc1a);
+ d2b = (b2 * Xn1b) + (a2 * acc1b);
+
+/* 5 */
+ Xn1a = *pIn++; /* Channel a */
+ Xn1b = *pIn++; /* Channel b */
+
+ acc1a = (b0 * Xn1a) + d1a;
+ acc1b = (b0 * Xn1b) + d1b;
+
+ *pOut++ = acc1a;
+ *pOut++ = acc1b;
+
+ d1a = ((b1 * Xn1a) + (a1 * acc1a)) + d2a;
+ d1b = ((b1 * Xn1b) + (a1 * acc1b)) + d2b;
+
+ d2a = (b2 * Xn1a) + (a2 * acc1a);
+ d2b = (b2 * Xn1b) + (a2 * acc1b);
+
+/* 6 */
+ Xn1a = *pIn++; /* Channel a */
+ Xn1b = *pIn++; /* Channel b */
+
+ acc1a = (b0 * Xn1a) + d1a;
+ acc1b = (b0 * Xn1b) + d1b;
+
+ *pOut++ = acc1a;
+ *pOut++ = acc1b;
+
+ d1a = ((b1 * Xn1a) + (a1 * acc1a)) + d2a;
+ d1b = ((b1 * Xn1b) + (a1 * acc1b)) + d2b;
+
+ d2a = (b2 * Xn1a) + (a2 * acc1a);
+ d2b = (b2 * Xn1b) + (a2 * acc1b);
+
+/* 7 */
+ Xn1a = *pIn++; /* Channel a */
+ Xn1b = *pIn++; /* Channel b */
+
+ acc1a = (b0 * Xn1a) + d1a;
+ acc1b = (b0 * Xn1b) + d1b;
+
+ *pOut++ = acc1a;
+ *pOut++ = acc1b;
+
+ d1a = ((b1 * Xn1a) + (a1 * acc1a)) + d2a;
+ d1b = ((b1 * Xn1b) + (a1 * acc1b)) + d2b;
+
+ d2a = (b2 * Xn1a) + (a2 * acc1a);
+ d2b = (b2 * Xn1b) + (a2 * acc1b);
+
+/* 8 */
+ Xn1a = *pIn++; /* Channel a */
+ Xn1b = *pIn++; /* Channel b */
+
+ acc1a = (b0 * Xn1a) + d1a;
+ acc1b = (b0 * Xn1b) + d1b;
+
+ *pOut++ = acc1a;
+ *pOut++ = acc1b;
+
+ d1a = ((b1 * Xn1a) + (a1 * acc1a)) + d2a;
+ d1b = ((b1 * Xn1b) + (a1 * acc1b)) + d2b;
+
+ d2a = (b2 * Xn1a) + (a2 * acc1a);
+ d2b = (b2 * Xn1b) + (a2 * acc1b);
+
+ /* decrement loop counter */
+ sample--;
+ }
+
+ /* Loop unrolling: Compute remaining outputs */
+ sample = blockSize & 0x7U;
+
+#else
+
+ /* Initialize blkCnt with number of samples */
+ sample = blockSize;
+
+#endif /* #if defined (ARM_MATH_LOOPUNROLL) */
+
+ while (sample > 0U) {
+ /* Read the input */
+ Xn1a = *pIn++; /* Channel a */
+ Xn1b = *pIn++; /* Channel b */
+
+ /* y[n] = b0 * x[n] + d1 */
+ acc1a = (b0 * Xn1a) + d1a;
+ acc1b = (b0 * Xn1b) + d1b;
+
+ /* Store the result in the accumulator in the destination buffer. */
+ *pOut++ = acc1a;
+ *pOut++ = acc1b;
+
+ /* Every time after the output is computed state should be updated. */
+ /* d1 = b1 * x[n] + a1 * y[n] + d2 */
+ d1a = ((b1 * Xn1a) + (a1 * acc1a)) + d2a;
+ d1b = ((b1 * Xn1b) + (a1 * acc1b)) + d2b;
+
+ /* d2 = b2 * x[n] + a2 * y[n] */
+ d2a = (b2 * Xn1a) + (a2 * acc1a);
+ d2b = (b2 * Xn1b) + (a2 * acc1b);
+
+ /* decrement loop counter */
+ sample--;
+ }
+
+ /* Store the updated state variables back into the state array */
+ pState[0] = d1a;
+ pState[1] = d2a;
+
+ pState[2] = d1b;
+ pState[3] = d2b;
+
+ pState += 4U;
+
+ /* The current stage input is given as the output to the next stage */
+ pIn = pDst;
+
+ /* Reset the output working pointer */
+ pOut = pDst;
+
+ /* Decrement the loop counter */
+ stage--;
+
+ } while (stage > 0U);
+
+}
+LOW_OPTIMIZATION_EXIT
+/**
+ @} end of BiquadCascadeDF2T group
+ */
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