From 76177aa280494bb36d7a0bcbda1078d4db717020 Mon Sep 17 00:00:00 2001 From: Ali Labbene Date: Mon, 9 Dec 2019 11:25:19 +0100 Subject: Official ARM version: v4.5 --- .../DSP/html/arm_fir_example_f32_8c-example.html | 281 +++++++++++++++++++++ 1 file changed, 281 insertions(+) create mode 100644 Documentation/DSP/html/arm_fir_example_f32_8c-example.html (limited to 'Documentation/DSP/html/arm_fir_example_f32_8c-example.html') diff --git a/Documentation/DSP/html/arm_fir_example_f32_8c-example.html b/Documentation/DSP/html/arm_fir_example_f32_8c-example.html new file mode 100644 index 0000000..fcef847 --- /dev/null +++ b/Documentation/DSP/html/arm_fir_example_f32_8c-example.html @@ -0,0 +1,281 @@ + + + + + +arm_fir_example_f32.c +CMSIS-DSP: arm_fir_example_f32.c + + + + + + + + + + + + + + + +
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CMSIS-DSP +  Version 1.4.7 +
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CMSIS DSP Software Library
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arm_fir_example_f32.c
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/* ----------------------------------------------------------------------
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* Copyright (C) 2010-2012 ARM Limited. All rights reserved.
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*
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* $Date: 17. January 2013
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* $Revision: V1.4.0
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*
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* Project: CMSIS DSP Library
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* Title: arm_fir_example_f32.c
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*
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* Description: Example code demonstrating how an FIR filter can be used
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* as a low pass filter.
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*
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* Target Processor: Cortex-M4/Cortex-M3
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*
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* Redistribution and use in source and binary forms, with or without
+
* modification, are permitted provided that the following conditions
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* 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
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* 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
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
+
* -------------------------------------------------------------------- */
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+
/* ----------------------------------------------------------------------
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** Include Files
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** ------------------------------------------------------------------- */
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+
#include "arm_math.h"
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#include "math_helper.h"
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+
/* ----------------------------------------------------------------------
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** Macro Defines
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** ------------------------------------------------------------------- */
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#define TEST_LENGTH_SAMPLES 320
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#define SNR_THRESHOLD_F32 140.0f
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#define BLOCK_SIZE 32
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#define NUM_TAPS 29
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/* -------------------------------------------------------------------
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* The input signal and reference output (computed with MATLAB)
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* are defined externally in arm_fir_lpf_data.c.
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* ------------------------------------------------------------------- */
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extern float32_t testInput_f32_1kHz_15kHz[TEST_LENGTH_SAMPLES];
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extern float32_t refOutput[TEST_LENGTH_SAMPLES];
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/* -------------------------------------------------------------------
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* Declare Test output buffer
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* ------------------------------------------------------------------- */
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static float32_t testOutput[TEST_LENGTH_SAMPLES];
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/* -------------------------------------------------------------------
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* Declare State buffer of size (numTaps + blockSize - 1)
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* ------------------------------------------------------------------- */
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static float32_t firStateF32[BLOCK_SIZE + NUM_TAPS - 1];
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+
/* ----------------------------------------------------------------------
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** FIR Coefficients buffer generated using fir1() MATLAB function.
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** fir1(28, 6/24)
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** ------------------------------------------------------------------- */
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const float32_t firCoeffs32[NUM_TAPS] = {
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-0.0018225230f, -0.0015879294f, +0.0000000000f, +0.0036977508f, +0.0080754303f, +0.0085302217f, -0.0000000000f, -0.0173976984f,
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-0.0341458607f, -0.0333591565f, +0.0000000000f, +0.0676308395f, +0.1522061835f, +0.2229246956f, +0.2504960933f, +0.2229246956f,
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+0.1522061835f, +0.0676308395f, +0.0000000000f, -0.0333591565f, -0.0341458607f, -0.0173976984f, -0.0000000000f, +0.0085302217f,
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+0.0080754303f, +0.0036977508f, +0.0000000000f, -0.0015879294f, -0.0018225230f
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};
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/* ------------------------------------------------------------------
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* Global variables for FIR LPF Example
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* ------------------------------------------------------------------- */
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uint32_t blockSize = BLOCK_SIZE;
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uint32_t numBlocks = TEST_LENGTH_SAMPLES/BLOCK_SIZE;
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float32_t snr;
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/* ----------------------------------------------------------------------
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* FIR LPF Example
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* ------------------------------------------------------------------- */
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int32_t main(void)
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{
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uint32_t i;
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arm_fir_instance_f32 S;
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arm_status status;
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float32_t *inputF32, *outputF32;
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/* Initialize input and output buffer pointers */
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inputF32 = &testInput_f32_1kHz_15kHz[0];
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outputF32 = &testOutput[0];
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/* Call FIR init function to initialize the instance structure. */
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arm_fir_init_f32(&S, NUM_TAPS, (float32_t *)&firCoeffs32[0], &firStateF32[0], blockSize);
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/* ----------------------------------------------------------------------
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** Call the FIR process function for every blockSize samples
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** ------------------------------------------------------------------- */
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for(i=0; i < numBlocks; i++)
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{
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arm_fir_f32(&S, inputF32 + (i * blockSize), outputF32 + (i * blockSize), blockSize);
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}
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/* ----------------------------------------------------------------------
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** Compare the generated output against the reference output computed
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** in MATLAB.
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** ------------------------------------------------------------------- */
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snr = arm_snr_f32(&refOutput[0], &testOutput[0], TEST_LENGTH_SAMPLES);
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if (snr < SNR_THRESHOLD_F32)
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{
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status = ARM_MATH_TEST_FAILURE;
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}
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else
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{
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status = ARM_MATH_SUCCESS;
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}
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/* ----------------------------------------------------------------------
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** Loop here if the signal does not match the reference output.
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** ------------------------------------------------------------------- */
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if( status != ARM_MATH_SUCCESS)
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{
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while(1);
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}
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while(1); /* main function does not return */
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}
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+
+
+ + + + -- cgit