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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_convolution_example_f32.c
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*
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* Description: Example code demonstrating Convolution of two input signals using fft.
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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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#include <arm_math.h>
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#include <math.h>
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#include <stdio.h>
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#include <gpio.h>
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#include <bsp.h>
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//#include "math_helper.h"
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#include <terminal.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 1024
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#define MAX_BLOCKSIZE 16
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/* ----------------------------------------------------------------------
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* Declare I/O buffers
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* ------------------------------------------------------------------- */
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float32_t Ak[MAX_BLOCKSIZE*2]; /* Input A */
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#define LCD_COLOR_WHITE 0xFFFF
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#define LCD_COLOR_BLACK 0x0000
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#define LCD_COLOR_GREY 0xF7DE
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#define LCD_COLOR_BLUE 0x001F
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#define LCD_COLOR_BLUE2 0x051F
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#define LCD_COLOR_RED 0xF800
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#define LCD_COLOR_MAGENTA 0xF81F
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#define LCD_COLOR_GREEN 0x07E0
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#define LCD_COLOR_CYAN 0x7FFF
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#define LCD_COLOR_YELLOW 0xFFE0
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extern streamdevice* __opnfiles__[__MAX_OPENED_FILES__];
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int main()
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{
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arm_status status; /* Status of the example */
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arm_cfft_radix4_instance_f32 cfft_instance; /* CFFT Structure instance */
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/* CFFT Structure instance pointer */
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arm_cfft_radix4_instance_f32 *cfft_instance_ptr =
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(arm_cfft_radix4_instance_f32*) &cfft_instance;
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/* Initialise the fft input buffers with all zeros */
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arm_fill_f32(0.0, Ak, MAX_BLOCKSIZE);
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for(int i =0;i<(MAX_BLOCKSIZE);i++)
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{
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Ak[2*i] = sin(4.0*PI*(float32_t)i/MAX_BLOCKSIZE);
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printf("%f\n\r",Ak[i]);
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}
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//gpioclr(LED1);
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/* Initialize the CFFT function to compute 64 point fft */
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status = arm_cfft_radix4_init_f32(cfft_instance_ptr, MAX_BLOCKSIZE, 0, 1);
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/* Transform input a[n] from time domain to frequency domain A[k] */
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arm_cfft_radix4_f32(cfft_instance_ptr, Ak);
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//gpioset(LED1);
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/* Initialize the CIFFT function to compute 64 point ifft */
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//status = arm_cfft_radix4_init_f32(cfft_instance_ptr, 16, 1, 1);
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/* Transform the multiplication output from frequency domain to time domain,
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that gives the convolved output */
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//arm_cfft_radix4_f32(cfft_instance_ptr, AxB);
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/* SNR Calculation */
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//snr = arm_snr_f32((float32_t *)testRefOutput_f32, AxB, srcALen + srcBLen - 1);
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/* Compare the SNR with threshold to test whether the
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computed output is matched with the reference output values. */
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printf("FFT Done!\n\r");
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for(int i =0;i<(MAX_BLOCKSIZE*2);i++)
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{
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printf("%f %f\n\r",Ak[2*i],Ak[(2*i)+1]);
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}
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while(1); /* main function does not return */
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}
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