CMSIS DSP Software Library: arm_fft_bin_example_f32.c Source File Main Page Modules Data Structures Files Examples File List Globals arm_fft_bin_example_f32.c Go to the documentation of this file.00001 /* ---------------------------------------------------------------------- 00002 * Copyright (C) 2010 ARM Limited. All rights reserved. 00003 * 00004 * $Date: 29. November 2010 00005 * $Revision: V1.0.3 00006 * 00007 * Project: CMSIS DSP Library 00008 * Title: arm_fft_bin_example_f32.c 00009 * 00010 * Description: Example code demonstrating calculation of Max energy bin of 00011 * frequency domain of input signal. 00012 * 00013 * Target Processor: Cortex-M4/Cortex-M3 00014 * 00015 * 00016 * Version 1.0.3 2010/11/29 00017 * Re-organized the CMSIS folders and updated documentation. 00018 * 00019 * Version 1.0.1 2010/10/05 KK 00020 * Production release and review comments incorporated. 00021 * 00022 * Version 1.0.0 2010/09/20 KK 00023 * Production release and review comments incorporated. 00024 * ------------------------------------------------------------------- */ 00025 00082 #include "arm_math.h" 00083 00084 #define TEST_LENGTH_SAMPLES 2048 00085 00086 /* ------------------------------------------------------------------- 00087 * External Input and Output buffer Declarations for FFT Bin Example 00088 * ------------------------------------------------------------------- */ 00089 extern float32_t testInput_f32_10khz[TEST_LENGTH_SAMPLES]; 00090 static float32_t testOutput[TEST_LENGTH_SAMPLES/2]; 00091 00092 /* ------------------------------------------------------------------ 00093 * Global variables for FFT Bin Example 00094 * ------------------------------------------------------------------- */ 00095 uint32_t fftSize = 1024; 00096 uint32_t ifftFlag = 0; 00097 uint32_t doBitReverse = 1; 00098 00099 /* Reference index at which max energy of bin ocuurs */ 00100 uint32_t refIndex = 213, testIndex = 0; 00101 00102 /* ---------------------------------------------------------------------- 00103 * Max magnitude FFT Bin test 00104 * ------------------------------------------------------------------- */ 00105 00106 int32_t main(void) 00107 { 00108 00109 arm_status status; 00110 arm_cfft_radix4_instance_f32 S; 00111 float32_t maxValue; 00112 00113 status = ARM_MATH_SUCCESS; 00114 00115 /* Initialize the CFFT/CIFFT module */ 00116 status = arm_cfft_radix4_init_f32(&S, fftSize, 00117 ifftFlag, doBitReverse); 00118 00119 /* Process the data through the CFFT/CIFFT module */ 00120 arm_cfft_radix4_f32(&S, testInput_f32_10khz); 00121 00122 00123 /* Process the data through the Complex Magnitude Module for 00124 calculating the magnitude at each bin */ 00125 arm_cmplx_mag_f32(testInput_f32_10khz, testOutput, 00126 fftSize); 00127 00128 /* Calculates maxValue and returns corresponding BIN value */ 00129 arm_max_f32(testOutput, fftSize, &maxValue, &testIndex); 00130 00131 if(testIndex != refIndex) 00132 { 00133 status = ARM_MATH_TEST_FAILURE; 00134 } 00135 00136 /* ---------------------------------------------------------------------- 00137 ** Loop here if the signals fail the PASS check. 00138 ** This denotes a test failure 00139 ** ------------------------------------------------------------------- */ 00140 00141 if( status != ARM_MATH_SUCCESS) 00142 { 00143 while(1); 00144 } 00145 } 00146  All Data Structures Files Functions Variables Typedefs Enumerations Enumerator Defines Generated on Mon Nov 29 2010 17:19:56 for CMSIS DSP Software Library by  1.7.2