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 /* ---------------------------------------------------------------------- * Copyright (C) 2010-2012 ARM Limited. All rights reserved. * * \$Date: 17. January 2013 * \$Revision: V1.4.0 * * Project: CMSIS DSP Library * Title: arm_dotproduct_example_f32.c * * Description: Example code computing dot product of two vectors. * * Target Processor: Cortex-M4/Cortex-M3 * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * 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 * 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 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * -------------------------------------------------------------------- */ /** * @ingroup groupExamples */ /** * @defgroup DotproductExample Dot Product Example * * \par Description: * \par * Demonstrates the use of the Multiply and Add functions to perform the dot product. * The dot product of two vectors is obtained by multiplying corresponding elements * and summing the products. * \par Algorithm: * \par * The two input vectors \c A and \c B with length \c n, are multiplied element-by-element * and then added to obtain dot product. * \par * This is denoted by the following equation: *
dotProduct = A[0] * B[0] + A[1] * B[1] + ... + A[n-1] * B[n-1]
* * \par Block Diagram: * \par * \image html dotProduct.gif * * \par Variables Description: * \par * \li \c srcA_buf_f32 points to first input vector * \li \c srcB_buf_f32 points to second input vector * \li \c testOutput stores dot product of the two input vectors. * * \par CMSIS DSP Software Library Functions Used: * \par * - arm_mult_f32() * - arm_add_f32() * * Refer * \link arm_dotproduct_example_f32.c \endlink * */ /** \example arm_dotproduct_example_f32.c */ #include #include "arm_math.h" /* ---------------------------------------------------------------------- * Defines each of the tests performed * ------------------------------------------------------------------- */ #define MAX_BLOCKSIZE 32 #define DELTA (0.000001f) /* ---------------------------------------------------------------------- * Test input data for Floating point Dot Product example for 32-blockSize * Generated by the MATLAB randn() function * ------------------------------------------------------------------- */ /* ---------------------------------------------------------------------- ** Test input data of srcA for blockSize 32 ** ------------------------------------------------------------------- */ float32_t srcA_buf_f32[MAX_BLOCKSIZE] = { -0.4325648115282207, -1.6655843782380970, 0.1253323064748307, 0.2876764203585489, -1.1464713506814637, 1.1909154656429988, 1.1891642016521031, -0.0376332765933176, 0.3272923614086541, 0.1746391428209245, -0.1867085776814394, 0.7257905482933027, -0.5883165430141887, 2.1831858181971011, -0.1363958830865957, 0.1139313135208096, 1.0667682113591888, 0.0592814605236053, -0.0956484054836690, -0.8323494636500225, 0.2944108163926404, -1.3361818579378040, 0.7143245518189522, 1.6235620644462707, -0.6917757017022868, 0.8579966728282626, 1.2540014216025324, -1.5937295764474768, -1.4409644319010200, 0.5711476236581780, -0.3998855777153632, 0.6899973754643451 }; /* ---------------------------------------------------------------------- ** Test input data of srcB for blockSize 32 ** ------------------------------------------------------------------- */ float32_t srcB_buf_f32[MAX_BLOCKSIZE] = { 1.7491401329284098, 0.1325982188803279, 0.3252281811989881, -0.7938091410349637, 0.3149236145048914, -0.5272704888029532, 0.9322666565031119, 1.1646643544607362, -2.0456694357357357, -0.6443728590041911, 1.7410657940825480, 0.4867684246821860, 1.0488288293660140, 1.4885752747099299, 1.2705014969484090, -1.8561241921210170, 2.1343209047321410, 1.4358467535865909, -0.9173023332875400, -1.1060770780029008, 0.8105708062681296, 0.6985430696369063, -0.4015827425012831, 1.2687512030669628, -0.7836083053674872, 0.2132664971465569, 0.7878984786088954, 0.8966819356782295, -0.1869172943544062, 1.0131816724341454, 0.2484350696132857, 0.0596083377937976 }; /* Reference dot product output */ float32_t refDotProdOut = 5.9273644806352142; /* ---------------------------------------------------------------------- * Declare Global variables * ------------------------------------------------------------------- */ float32_t multOutput[MAX_BLOCKSIZE]; /* Intermediate output */ float32_t testOutput; /* Final ouput */ arm_status status; /* Status of the example */ int32_t main(void) { uint32_t i; /* Loop counter */ float32_t diff; /* Difference between reference and test outputs */ /* Multiplication of two input buffers */ arm_mult_f32(srcA_buf_f32, srcB_buf_f32, multOutput, MAX_BLOCKSIZE); /* Accumulate the multiplication output values to get the dot product of the two inputs */ for(i=0; i< MAX_BLOCKSIZE; i++) { arm_add_f32(&testOutput, &multOutput[i], &testOutput, 1); } /* absolute value of difference between ref and test */ diff = fabsf(refDotProdOut - testOutput); /* Comparison of dot product value with reference */ if(diff > DELTA) { status = ARM_MATH_TEST_FAILURE; } if( status == ARM_MATH_TEST_FAILURE) { while(1); } while(1); /* main function does not return */ } /** \endlink */