arm_sin_cos_example_f32.c
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/* ----------------------------------------------------------------------
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* Copyright (C) 2010 ARM Limited. All rights reserved.
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*
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* $Date: 29. November 2010
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* $Revision: V1.0.3
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*
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* Project: CMSIS DSP Library
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* Title: arm_sin_cos_example_f32.c
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*
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* Description: Example code demonstrating sin and cos calculation of input signal.
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*
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* Target Processor: Cortex-M4/Cortex-M3
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*
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*
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* Version 1.0.3 2010/11/29
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* Re-organized the CMSIS folders and updated documentation.
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*
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* Version 1.0.1 2010/10/05 KK
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* Production release and review comments incorporated.
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*
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* Version 1.0.0 2010/09/20 KK
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* Production release and review comments incorporated.
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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 SinCosExample SineCosine Example
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*
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* \par Description:
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* \par
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* Demonstrates the Pythagorean trignometric identity with the use of Cosine, Sine, Vector
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* Multiplication, and Vector Addition functions.
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*
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* \par Algorithm:
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* \par
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* Mathematically, the Pythagorean trignometric identity is defined by the following equation:
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* <pre>sin(x) * sin(x) + cos(x) * cos(x) = 1</pre>
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* where \c x is the angle in radians.
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*
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* \par Block Diagram:
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* \par
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* \image html sinCos.gif
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*
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* \par Variables Description:
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* \par
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* \li \c testInput_f32 array of input angle in radians
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* \li \c testOutput stores sum of the squares of sine and cosine values of input angle
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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_cos_f32()
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* - arm_sin_f32()
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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_sin_cos_example_f32.c \endlink
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*
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*/
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/** \example arm_sin_cos_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 sin_cos example for 32-blockSize
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* Generated by the MATLAB randn() function
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* ------------------------------------------------------------------- */
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const float32_t testInput_f32[MAX_BLOCKSIZE] =
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{
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-1.244916875853235400, -4.793533929171324800, 0.360705030233248850, 0.827929644170887320, -3.299532218312426900, 3.427441903227623800, 3.422401784294607700, -0.108308165334010680, |
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0.941943896490312180, 0.502609575000365850, -0.537345278736373500, 2.088817392965764500, -1.693168684143455700, 6.283185307179590700, -0.392545884746175080, 0.327893095115825040, |
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3.070147440456292300, 0.170611405884662230, -0.275275082396073010, -2.395492805446796300, 0.847311163536506600, -3.845517018083148800, 2.055818378415868300, 4.672594161978930800, |
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-1.990923030266425800, 2.469305197656249500, 3.609002606064021000, -4.586736582331667500, -4.147080139136136300, 1.643756718868359500, -1.150866392366494800, 1.985805026477433800 |
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}; |
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const float32_t testRefOutput_f32 = 1.000000000; |
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/* ----------------------------------------------------------------------
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* Declare Global variables
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* ------------------------------------------------------------------- */
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uint32_t blockSize = 32;
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float32_t testOutput; |
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float32_t cosOutput; |
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float32_t sinOutput; |
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float32_t cosSquareOutput; |
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float32_t sinSquareOutput; |
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/* ----------------------------------------------------------------------
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* Max magnitude FFT Bin test
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* ------------------------------------------------------------------- */
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arm_status status; |
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int32_t main(void)
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{
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float32_t diff; |
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uint32_t i; |
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for(i=0; i< blockSize; i++) |
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{
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cosOutput = arm_cos_f32(testInput_f32[i]); |
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sinOutput = arm_sin_f32(testInput_f32[i]); |
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arm_mult_f32(&cosOutput, &cosOutput, &cosSquareOutput, 1);
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arm_mult_f32(&sinOutput, &sinOutput, &sinSquareOutput, 1);
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arm_add_f32(&cosSquareOutput, &sinSquareOutput, &testOutput, 1);
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/* absolute value of difference between ref and test */
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diff = fabsf(testRefOutput_f32 - testOutput); |
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/* Comparison of sin_cos 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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} |
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while(1); /* main function does not return */ |
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} |
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/** \endlink */
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