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/* ----------------------------------------------------------------------
* Project: CMSIS DSP Library
* Title: arm_biquad_cascade_df2T_init_f64.c
* Description: Initialization function for floating-point transposed direct form II Biquad cascade 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 BiquadCascadeDF2T
* @{
*/
/**
* @brief Initialization function for the floating-point transposed direct form II Biquad cascade filter.
* @param[in,out] *S points to an instance of the filter data structure.
* @param[in] numStages number of 2nd order stages in the filter.
* @param[in] *pCoeffs points to the filter coefficients.
* @param[in] *pState points to the state buffer.
* @return none
*
* <b>Coefficient and State Ordering:</b>
* \par
* The coefficients are stored in the array <code>pCoeffs</code> in the following order:
* <pre>
* {b10, b11, b12, a11, a12, b20, b21, b22, a21, a22, ...}
* </pre>
*
* \par
* where <code>b1x</code> and <code>a1x</code> are the coefficients for the first stage,
* <code>b2x</code> and <code>a2x</code> are the coefficients for the second stage,
* and so on. The <code>pCoeffs</code> array contains a total of <code>5*numStages</code> values.
*
* \par
* The <code>pState</code> is a pointer to state array.
* Each Biquad stage has 2 state variables <code>d1,</code> and <code>d2</code>.
* The 2 state variables for stage 1 are first, then the 2 state variables for stage 2, and so on.
* The state array has a total length of <code>2*numStages</code> values.
* The state variables are updated after each block of data is processed; the coefficients are untouched.
*/
void arm_biquad_cascade_df2T_init_f64(
arm_biquad_cascade_df2T_instance_f64 * S,
uint8_t numStages,
float64_t * pCoeffs,
float64_t * pState)
{
/* Assign filter stages */
S->numStages = numStages;
/* Assign coefficient pointer */
S->pCoeffs = pCoeffs;
/* Clear state buffer and size is always 2 * numStages */
memset(pState, 0, (2U * (uint32_t) numStages) * sizeof(float64_t));
/* Assign state pointer */
S->pState = pState;
}
/**
* @} end of BiquadCascadeDF2T group
*/
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