/* ----------------------------------------------------------------------
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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_dotproduct_example_f32.c
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*
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* Description: Example code computing dot product of two vectors.
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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
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* modification, are permitted provided that the following conditions
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* are met:
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* - 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
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* 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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/**
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* @ingroup groupExamples
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*/
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/**
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* @defgroup DotproductExample Dot Product Example
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*
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* \par Description:
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* \par
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* Demonstrates the use of the Multiply and Add functions to perform the dot product.
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* The dot product of two vectors is obtained by multiplying corresponding elements
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* and summing the products.
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* \par Algorithm:
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* \par
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* The two input vectors \c A and \c B with length \c n, are multiplied element-by-element
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* and then added to obtain dot product.
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* \par
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* This is denoted by the following equation:
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* <pre> dotProduct = A[0] * B[0] + A[1] * B[1] + ... + A[n-1] * B[n-1]</pre>
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*
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* \par Block Diagram:
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* \par
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* \image html dotProduct.gif
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*
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* \par Variables Description:
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* \par
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* \li \c srcA_buf_f32 points to first input vector
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* \li \c srcB_buf_f32 points to second input vector
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* \li \c testOutput stores dot product of the two input vectors.
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*
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* \par CMSIS DSP Software Library Functions Used:
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* \par
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* - arm_mult_f32()
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* - arm_add_f32()
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*
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* <b> Refer </b>
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* \link arm_dotproduct_example_f32.c \endlink
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*
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*/
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/** \example arm_dotproduct_example_f32.c
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*/
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#include <math.h>
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#include "arm_math.h"
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/* ----------------------------------------------------------------------
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* Defines each of the tests performed
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* ------------------------------------------------------------------- */
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#define MAX_BLOCKSIZE 32
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#define DELTA (0.000001f)
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/* ----------------------------------------------------------------------
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* Test input data for Floating point Dot Product example for 32-blockSize
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* Generated by the MATLAB randn() function
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* ------------------------------------------------------------------- */
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/* ----------------------------------------------------------------------
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** Test input data of srcA for blockSize 32
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** ------------------------------------------------------------------- */
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float32_t srcA_buf_f32[MAX_BLOCKSIZE] =
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{
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-0.4325648115282207, -1.6655843782380970, 0.1253323064748307,
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0.2876764203585489, -1.1464713506814637, 1.1909154656429988,
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1.1891642016521031, -0.0376332765933176, 0.3272923614086541,
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0.1746391428209245, -0.1867085776814394, 0.7257905482933027,
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-0.5883165430141887, 2.1831858181971011, -0.1363958830865957,
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0.1139313135208096, 1.0667682113591888, 0.0592814605236053,
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-0.0956484054836690, -0.8323494636500225, 0.2944108163926404,
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-1.3361818579378040, 0.7143245518189522, 1.6235620644462707,
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-0.6917757017022868, 0.8579966728282626, 1.2540014216025324,
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-1.5937295764474768, -1.4409644319010200, 0.5711476236581780,
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-0.3998855777153632, 0.6899973754643451
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};
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/* ----------------------------------------------------------------------
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** Test input data of srcB for blockSize 32
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** ------------------------------------------------------------------- */
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float32_t srcB_buf_f32[MAX_BLOCKSIZE] =
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{
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1.7491401329284098, 0.1325982188803279, 0.3252281811989881,
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-0.7938091410349637, 0.3149236145048914, -0.5272704888029532,
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0.9322666565031119, 1.1646643544607362, -2.0456694357357357,
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-0.6443728590041911, 1.7410657940825480, 0.4867684246821860,
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1.0488288293660140, 1.4885752747099299, 1.2705014969484090,
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-1.8561241921210170, 2.1343209047321410, 1.4358467535865909,
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-0.9173023332875400, -1.1060770780029008, 0.8105708062681296,
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0.6985430696369063, -0.4015827425012831, 1.2687512030669628,
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-0.7836083053674872, 0.2132664971465569, 0.7878984786088954,
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0.8966819356782295, -0.1869172943544062, 1.0131816724341454,
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0.2484350696132857, 0.0596083377937976
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};
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/* Reference dot product output */
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float32_t refDotProdOut = 5.9273644806352142;
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/* ----------------------------------------------------------------------
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* Declare Global variables
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* ------------------------------------------------------------------- */
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float32_t multOutput[MAX_BLOCKSIZE]; /* Intermediate output */
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float32_t testOutput; /* Final ouput */
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arm_status status; /* Status of the example */
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int32_t main(void)
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{
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uint32_t i; /* Loop counter */
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float32_t diff; /* Difference between reference and test outputs */
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/* Multiplication of two input buffers */
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arm_mult_f32(srcA_buf_f32, srcB_buf_f32, multOutput, MAX_BLOCKSIZE);
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/* Accumulate the multiplication output values to
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get the dot product of the two inputs */
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for(i=0; i< MAX_BLOCKSIZE; i++)
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{
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arm_add_f32(&testOutput, &multOutput[i], &testOutput, 1);
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}
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/* absolute value of difference between ref and test */
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diff = fabsf(refDotProdOut - testOutput);
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/* Comparison of dot product value with reference */
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if (diff > DELTA)
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{
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status = ARM_MATH_TEST_FAILURE;
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}
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if ( status == ARM_MATH_TEST_FAILURE)
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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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/** \endlink */
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