/*This is a signal sum of 800 hz and 3.2 khz sine waves
which sampled in 10khz and 32 of this samples are 
create a data array.
In this example first fft later inverse fft of 
signal calculated by arduino after the process output 
data will be same with input as we expected.
*/

#include "simpleDSP_fft.h"

#define DATA_LEN 32

COMPLEX data[DATA_LEN] =
    {
        1380.30387436698,
        0.0,
        1411.95640122018,
        0.0,
        1509.33975623973,
        0.0,
        1680.97457720023,
        0.0,
        1945.62587488903,
        0.0,
        2341.52925818755,
        0.0,
        2948.35729012667,
        0.0,
        3949.59187366481,
        0.0,
        5862.08882614601,
        0.0,
        10877.1835331189,
        0.0,
        57733.7247892472,
        0.0,
        18723.4608750840,
        0.0,
        8298.42015377624,
        0.0,
        5427.67344196089,
        0.0,
        4083.68378659686,
        0.0,
        3304.24870517258,
        0.0,
        2795.46623030534,
        0.0,
        2437.40771712744,
        0.0,
        2172.01084844531,
        0.0,
        1967.76373917975,
        0.0,
        1806.10353733366,
        0.0,
        1675.40258778435,
        0.0,
        1568.02578276502,
        0.0,
        1478.77466877542,
        0.0,
        1404.01359504832,
        0.0,
        1341.15564969180,
        0.0,
        1288.35041545534,
        0.0,
        1244.29204061566,
        0.0,
        1208.10451406246,
        0.0,
        1179.28219795848,
        0.0,
        1157.67736663769,
        0.0,
        1143.53841226378,
        0.0,
};

long startTime;
long calcTime;

void setup()
{
    Serial.begin(9600);
    startTime = millis();
    FFT(data, DATA_LEN);
    IFFT(data, DATA_LEN);
    calcTime = millis() - startTime;
    Serial.print("Total calculation time: ");
    Serial.println(calcTime);
    for (int i = 0; i < DATA_LEN; i++)
    {
        Serial.print(data[i].real / DATA_LEN);
        Serial.print("\t\t");
        Serial.println(data[i].imag / DATA_LEN);
    }
}

void loop()
{
    // put your main code here, to run repeatedly:
}