Eli Hughes / CMSIS_DSP_401

V4.0.1 of the ARM CMSIS DSP libraries. Note that arm_bitreversal2.s, arm_cfft_f32.c and arm_rfft_fast_f32.c had to be removed. arm_bitreversal2.s will not assemble with the online tools. So, the fast f32 FFT functions are not yet available. All the other FFT functions are available.

Dependents:   MPU9150_Example fir_f32 fir_f32 MPU9150_nucleo_noni2cdev ... more

FilteringFunctions/arm_biquad_cascade_df1_init_f32.c@0:3d9c67d97d6f, 2014-07-28 (annotated)

Committer:
emh203
Date:
Mon Jul 28 15:03:15 2014 +0000
Revision:
0:3d9c67d97d6f
1st working commit.   Had to remove arm_bitreversal2.s     arm_cfft_f32.c and arm_rfft_fast_f32.c.    The .s will not assemble.      For now I removed these functions so we could at least have a library for the other functions.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
emh203 0:3d9c67d97d6f 1 /*-----------------------------------------------------------------------------
emh203 0:3d9c67d97d6f 2 * Copyright (C) 2010-2014 ARM Limited. All rights reserved.
emh203 0:3d9c67d97d6f 3 *
emh203 0:3d9c67d97d6f 4 * $Date: 12. March 2014
emh203 0:3d9c67d97d6f 5 * $Revision: V1.4.3
emh203 0:3d9c67d97d6f 6 *
emh203 0:3d9c67d97d6f 7 * Project: CMSIS DSP Library
emh203 0:3d9c67d97d6f 8 * Title: arm_biquad_cascade_df1_init_f32.c
emh203 0:3d9c67d97d6f 9 *
emh203 0:3d9c67d97d6f 10 * Description: floating-point Biquad cascade DirectFormI(DF1) filter initialization function.
emh203 0:3d9c67d97d6f 11 *
emh203 0:3d9c67d97d6f 12 * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
emh203 0:3d9c67d97d6f 13 *
emh203 0:3d9c67d97d6f 14 * Redistribution and use in source and binary forms, with or without
emh203 0:3d9c67d97d6f 15 * modification, are permitted provided that the following conditions
emh203 0:3d9c67d97d6f 16 * are met:
emh203 0:3d9c67d97d6f 17 * - Redistributions of source code must retain the above copyright
emh203 0:3d9c67d97d6f 18 * notice, this list of conditions and the following disclaimer.
emh203 0:3d9c67d97d6f 19 * - Redistributions in binary form must reproduce the above copyright
emh203 0:3d9c67d97d6f 20 * notice, this list of conditions and the following disclaimer in
emh203 0:3d9c67d97d6f 21 * the documentation and/or other materials provided with the
emh203 0:3d9c67d97d6f 22 * distribution.
emh203 0:3d9c67d97d6f 23 * - Neither the name of ARM LIMITED nor the names of its contributors
emh203 0:3d9c67d97d6f 24 * may be used to endorse or promote products derived from this
emh203 0:3d9c67d97d6f 25 * software without specific prior written permission.
emh203 0:3d9c67d97d6f 26 *
emh203 0:3d9c67d97d6f 27 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
emh203 0:3d9c67d97d6f 28 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
emh203 0:3d9c67d97d6f 29 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
emh203 0:3d9c67d97d6f 30 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
emh203 0:3d9c67d97d6f 31 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
emh203 0:3d9c67d97d6f 32 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
emh203 0:3d9c67d97d6f 33 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
emh203 0:3d9c67d97d6f 34 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
emh203 0:3d9c67d97d6f 35 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
emh203 0:3d9c67d97d6f 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
emh203 0:3d9c67d97d6f 37 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
emh203 0:3d9c67d97d6f 38 * POSSIBILITY OF SUCH DAMAGE.
emh203 0:3d9c67d97d6f 39 * ---------------------------------------------------------------------------*/
emh203 0:3d9c67d97d6f 40
emh203 0:3d9c67d97d6f 41 #include "arm_math.h"
emh203 0:3d9c67d97d6f 42
emh203 0:3d9c67d97d6f 43 /**
emh203 0:3d9c67d97d6f 44 * @ingroup groupFilters
emh203 0:3d9c67d97d6f 45 */
emh203 0:3d9c67d97d6f 46
emh203 0:3d9c67d97d6f 47 /**
emh203 0:3d9c67d97d6f 48 * @addtogroup BiquadCascadeDF1
emh203 0:3d9c67d97d6f 49 * @{
emh203 0:3d9c67d97d6f 50 */
emh203 0:3d9c67d97d6f 51
emh203 0:3d9c67d97d6f 52 /**
emh203 0:3d9c67d97d6f 53 * @details
emh203 0:3d9c67d97d6f 54 * @brief Initialization function for the floating-point Biquad cascade filter.
emh203 0:3d9c67d97d6f 55 * @param[in,out] *S points to an instance of the floating-point Biquad cascade structure.
emh203 0:3d9c67d97d6f 56 * @param[in] numStages number of 2nd order stages in the filter.
emh203 0:3d9c67d97d6f 57 * @param[in] *pCoeffs points to the filter coefficients array.
emh203 0:3d9c67d97d6f 58 * @param[in] *pState points to the state array.
emh203 0:3d9c67d97d6f 59 * @return none
emh203 0:3d9c67d97d6f 60 *
emh203 0:3d9c67d97d6f 61 *
emh203 0:3d9c67d97d6f 62 * <b>Coefficient and State Ordering:</b>
emh203 0:3d9c67d97d6f 63 *
emh203 0:3d9c67d97d6f 64 * \par
emh203 0:3d9c67d97d6f 65 * The coefficients are stored in the array <code>pCoeffs</code> in the following order:
emh203 0:3d9c67d97d6f 66 * <pre>
emh203 0:3d9c67d97d6f 67 * {b10, b11, b12, a11, a12, b20, b21, b22, a21, a22, ...}
emh203 0:3d9c67d97d6f 68 * </pre>
emh203 0:3d9c67d97d6f 69 *
emh203 0:3d9c67d97d6f 70 * \par
emh203 0:3d9c67d97d6f 71 * where <code>b1x</code> and <code>a1x</code> are the coefficients for the first stage,
emh203 0:3d9c67d97d6f 72 * <code>b2x</code> and <code>a2x</code> are the coefficients for the second stage,
emh203 0:3d9c67d97d6f 73 * and so on. The <code>pCoeffs</code> array contains a total of <code>5*numStages</code> values.
emh203 0:3d9c67d97d6f 74 *
emh203 0:3d9c67d97d6f 75 * \par
emh203 0:3d9c67d97d6f 76 * The <code>pState</code> is a pointer to state array.
emh203 0:3d9c67d97d6f 77 * Each Biquad stage has 4 state variables <code>x[n-1], x[n-2], y[n-1],</code> and <code>y[n-2]</code>.
emh203 0:3d9c67d97d6f 78 * The state variables are arranged in the <code>pState</code> array as:
emh203 0:3d9c67d97d6f 79 * <pre>
emh203 0:3d9c67d97d6f 80 * {x[n-1], x[n-2], y[n-1], y[n-2]}
emh203 0:3d9c67d97d6f 81 * </pre>
emh203 0:3d9c67d97d6f 82 * The 4 state variables for stage 1 are first, then the 4 state variables for stage 2, and so on.
emh203 0:3d9c67d97d6f 83 * The state array has a total length of <code>4*numStages</code> values.
emh203 0:3d9c67d97d6f 84 * The state variables are updated after each block of data is processed; the coefficients are untouched.
emh203 0:3d9c67d97d6f 85 *
emh203 0:3d9c67d97d6f 86 */
emh203 0:3d9c67d97d6f 87
emh203 0:3d9c67d97d6f 88 void arm_biquad_cascade_df1_init_f32(
emh203 0:3d9c67d97d6f 89 arm_biquad_casd_df1_inst_f32 * S,
emh203 0:3d9c67d97d6f 90 uint8_t numStages,
emh203 0:3d9c67d97d6f 91 float32_t * pCoeffs,
emh203 0:3d9c67d97d6f 92 float32_t * pState)
emh203 0:3d9c67d97d6f 93 {
emh203 0:3d9c67d97d6f 94 /* Assign filter stages */
emh203 0:3d9c67d97d6f 95 S->numStages = numStages;
emh203 0:3d9c67d97d6f 96
emh203 0:3d9c67d97d6f 97 /* Assign coefficient pointer */
emh203 0:3d9c67d97d6f 98 S->pCoeffs = pCoeffs;
emh203 0:3d9c67d97d6f 99
emh203 0:3d9c67d97d6f 100 /* Clear state buffer and size is always 4 * numStages */
emh203 0:3d9c67d97d6f 101 memset(pState, 0, (4u * (uint32_t) numStages) * sizeof(float32_t));
emh203 0:3d9c67d97d6f 102
emh203 0:3d9c67d97d6f 103 /* Assign state pointer */
emh203 0:3d9c67d97d6f 104 S->pState = pState;
emh203 0:3d9c67d97d6f 105 }
emh203 0:3d9c67d97d6f 106
emh203 0:3d9c67d97d6f 107 /**
emh203 0:3d9c67d97d6f 108 * @} end of BiquadCascadeDF1 group
emh203 0:3d9c67d97d6f 109 */