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/*
* Copyright (C) 2015 Eistec AB
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @ingroup examples
* @{
*
* @file
* @brief ARM DSP library test application
*
* @author Joakim Nohlgård <joakim.nohlgard@eistec.se>
*
* @}
*/
#include <stdio.h>
#include <stdint.h>
#include <math.h>
#include "arm_math.h"
#define MAX_BLOCKSIZE 32
#define DELTA (0.0000001f)
/* ----------------------------------------------------------------------
* Declare I/O buffers
* ------------------------------------------------------------------- */
float32_t wire1[MAX_BLOCKSIZE];
float32_t wire2[MAX_BLOCKSIZE];
float32_t wire3[MAX_BLOCKSIZE];
/* ----------------------------------------------------------------------
* Test input data for Floating point Variance example for 32-blockSize
* Generated by the MATLAB randn() function
* ------------------------------------------------------------------- */
float32_t testInput_f32[32] =
{
-0.432564811528221, -1.665584378238097, 0.125332306474831, 0.287676420358549,
-1.146471350681464, 1.190915465642999, 1.189164201652103, -0.037633276593318,
0.327292361408654, 0.174639142820925, -0.186708577681439, 0.725790548293303,
-0.588316543014189, 2.183185818197101, -0.136395883086596, 0.113931313520810,
1.066768211359189, 0.059281460523605, -0.095648405483669, -0.832349463650022,
0.294410816392640, -1.336181857937804, 0.714324551818952, 1.623562064446271,
-0.691775701702287, 0.857996672828263, 1.254001421602532, -1.593729576447477,
-1.440964431901020, 0.571147623658178, -0.399885577715363, 0.689997375464345
};
/* ----------------------------------------------------------------------
* Declare Global variables
* ------------------------------------------------------------------- */
uint32_t blockSize = 32;
float32_t refVarianceOut = 0.903941793931839;
/* ----------------------------------------------------------------------
* Variance calculation test
* ------------------------------------------------------------------- */
int main(void)
{
arm_status status;
float32_t mean;
float32_t oneByBlockSize = 1.0 / (blockSize);
float32_t variance;
float32_t diff;
status = ARM_MATH_SUCCESS;
puts("ARM DSP lib test");
puts("Note: This test is using 32 bit IEEE 754 floating point numbers,"
"(24 bit mantissa, 7 bit exponent)");
puts("Expect roughly 7 decimals precision on the result.");
/* Calculation of mean value of input */
/* x' = 1/blockSize * (x(0)* 1 + x(1) * 1 + ... + x(n-1) * 1) */
/* Fill wire1 buffer with 1.0 value */
arm_fill_f32(1.0, wire1, blockSize);
/* Calculate the dot product of wire1 and wire2 */
/* (x(0)* 1 + x(1) * 1 + ...+ x(n-1) * 1) */
arm_dot_prod_f32(testInput_f32, wire1, blockSize, &mean);
/* 1/blockSize * (x(0)* 1 + x(1) * 1 + ... + x(n-1) * 1) */
arm_mult_f32(&mean, &oneByBlockSize, &mean, 1);
/* Calculation of variance value of input */
/* (1/blockSize) * (x(0) - x') * (x(0) - x') + (x(1) - x') * (x(1) - x') + ... + (x(n-1) - x') * (x(n-1) - x') */
/* Fill wire2 with mean value x' */
arm_fill_f32(mean, wire2, blockSize);
/* wire3 contains (x-x') */
arm_sub_f32(testInput_f32, wire2, wire3, blockSize);
/* wire2 contains (x-x') */
arm_copy_f32(wire3, wire2, blockSize);
/* (x(0) - x') * (x(0) - x') + (x(1) - x') * (x(1) - x') + ... + (x(n-1) - x') * (x(n-1) - x') */
arm_dot_prod_f32(wire2, wire3, blockSize, &variance);
/* Calculation of 1/blockSize */
oneByBlockSize = 1.0 / (blockSize - 1);
/* Calculation of variance */
arm_mult_f32(&variance, &oneByBlockSize, &variance, 1);
/* absolute value of difference between ref and test */
diff = variance - refVarianceOut;
/* Split into fractional and integral parts, since printing floats may not be supported on all platforms */
float int_part;
float frac_part = fabsf(modff(variance, &int_part));
printf(" dsp: %3d.%09d\n", (int) int_part, (int) (frac_part * 1.0e9f + 0.5f));
puts( "reference: 0.903941793931839");
frac_part = fabsf(modff(diff, &int_part));
printf(" diff: %3d.%09d\n", (int) int_part, (int) (frac_part * 1.0e9f + 0.5f));
/* Comparison of variance value with reference */
if(fabsf(diff) > DELTA) {
status = ARM_MATH_TEST_FAILURE;
}
if(status != ARM_MATH_SUCCESS) {
puts("Test failed");
while(1)
;
}
puts("Test done");
while(1)
; /* main function does not return */
}