Flavio Lencina / Mbed 2 deprecated TCC_MCSA

Serial Communication/ Analog Read/ FFT compute / LCD Text / Write on SD Card / read and write RTC application. K64F app developed for Electrical Engineering undergraduate final project at Ulbra university.

Dependencies:   SDFileSystem TextLCD mbed

Serial, LCD 20x4, RTC, SD-Card, ADC features application. Included 5-key keyboard using AN0 channel, RTC update via serial, compute FFT and storage in SD-Card.

main.cpp@1:f070e455cea0, 2014-12-19 (annotated)

Committer:
MikamiUitOpen
Date:
Fri Dec 19 12:34:56 2014 +0000
Revision:
1:f070e455cea0
Parent:
0:5bed9d6dc43b
Child:
2:03e1399ed9eb
2

Who changed what in which revision?

UserRevisionLine numberNew contents of line
MikamiUitOpen 0:5bed9d6dc43b 1 //--------------------------------------------------------------
MikamiUitOpen 1:f070e455cea0 2 // Demo program of FftReal class
MikamiUitOpen 0:5bed9d6dc43b 3 // Copyright (c) 2014 MIKAMI, Naoki, 2014/12/19
MikamiUitOpen 0:5bed9d6dc43b 4 //--------------------------------------------------------------
MikamiUitOpen 0:5bed9d6dc43b 5
MikamiUitOpen 0:5bed9d6dc43b 6 #include "dftComplex.hpp"
MikamiUitOpen 0:5bed9d6dc43b 7 #include "fftReal.hpp"
MikamiUitOpen 0:5bed9d6dc43b 8
MikamiUitOpen 0:5bed9d6dc43b 9 #include "mbed.h"
MikamiUitOpen 0:5bed9d6dc43b 10
MikamiUitOpen 0:5bed9d6dc43b 11 using namespace Mikami;
MikamiUitOpen 0:5bed9d6dc43b 12
MikamiUitOpen 0:5bed9d6dc43b 13 int main()
MikamiUitOpen 0:5bed9d6dc43b 14 {
MikamiUitOpen 0:5bed9d6dc43b 15 const int N = 256;//16; // number of date for FFT
MikamiUitOpen 0:5bed9d6dc43b 16
MikamiUitOpen 0:5bed9d6dc43b 17 float x1[N], x2[N];
MikamiUitOpen 0:5bed9d6dc43b 18 Complex y1[N], y2[N/2+1];
MikamiUitOpen 0:5bed9d6dc43b 19
MikamiUitOpen 1:f070e455cea0 20 // Generate random data
MikamiUitOpen 0:5bed9d6dc43b 21 srand(1234);
MikamiUitOpen 0:5bed9d6dc43b 22 for (int n=0; n<N; n++)
MikamiUitOpen 0:5bed9d6dc43b 23 x1[n] = 2.0f*rand()/(float)RAND_MAX - 1.0f;
MikamiUitOpen 0:5bed9d6dc43b 24 printf("\r\n#### Original data for DFT ####\r\n");
MikamiUitOpen 0:5bed9d6dc43b 25 for (int n=0; n<N; n++)
MikamiUitOpen 0:5bed9d6dc43b 26 printf("f[%2d]: %8.4f\r\n", n, x1[n]);
MikamiUitOpen 0:5bed9d6dc43b 27
MikamiUitOpen 1:f070e455cea0 28 // DFT, for comarison
MikamiUitOpen 0:5bed9d6dc43b 29 DftComplex(x1, y1, N);
MikamiUitOpen 0:5bed9d6dc43b 30 printf("\r\n#### Result of direct DFT ####\r\n");
MikamiUitOpen 0:5bed9d6dc43b 31 printf(" real imaginary\r\n");
MikamiUitOpen 0:5bed9d6dc43b 32 for (int n=0; n<N; n++)
MikamiUitOpen 0:5bed9d6dc43b 33 printf("F[%2d]: %8.4f, %8.4f\r\n", n, y1[n].real(), y1[n].imag());
MikamiUitOpen 0:5bed9d6dc43b 34
MikamiUitOpen 1:f070e455cea0 35 Timer tm; // for measurement of execution time
MikamiUitOpen 0:5bed9d6dc43b 36
MikamiUitOpen 1:f070e455cea0 37 // FFT
MikamiUitOpen 0:5bed9d6dc43b 38 FftReal fft(N);
MikamiUitOpen 0:5bed9d6dc43b 39 tm.reset();
MikamiUitOpen 0:5bed9d6dc43b 40 tm.start();
MikamiUitOpen 0:5bed9d6dc43b 41 fft.Execute(x1, y2);
MikamiUitOpen 0:5bed9d6dc43b 42 tm.stop();
MikamiUitOpen 0:5bed9d6dc43b 43 printf("\r\nExecution time (FFT): %d [us]\r\n", tm.read_us());
MikamiUitOpen 0:5bed9d6dc43b 44 printf("\r\n#### Result of DFT using FFT ####\r\n");
MikamiUitOpen 0:5bed9d6dc43b 45 for (int n=0; n<=N/2; n++)
MikamiUitOpen 0:5bed9d6dc43b 46 printf("F[%2d]: %8.4f, %8.4f\r\n", n, y2[n].real(), y2[n].imag());
MikamiUitOpen 0:5bed9d6dc43b 47
MikamiUitOpen 1:f070e455cea0 48 // IFFT
MikamiUitOpen 0:5bed9d6dc43b 49 tm.reset();
MikamiUitOpen 0:5bed9d6dc43b 50 tm.start();
MikamiUitOpen 0:5bed9d6dc43b 51 fft.ExecuteIfft(y2, x2);
MikamiUitOpen 0:5bed9d6dc43b 52 tm.stop();
MikamiUitOpen 0:5bed9d6dc43b 53 printf("\r\nExecution time (IFFT): %d [us]\r\n", tm.read_us());
MikamiUitOpen 0:5bed9d6dc43b 54 printf("\r\n#### Result of IFFT ####\r\n");
MikamiUitOpen 0:5bed9d6dc43b 55 printf(" original IFFT of FFT\r\n");
MikamiUitOpen 0:5bed9d6dc43b 56 for (int n=0; n<N; n++)
MikamiUitOpen 0:5bed9d6dc43b 57 printf("f[%2d]: %8.4f, %8.4f\r\n", n, x1[n], x2[n]);
MikamiUitOpen 0:5bed9d6dc43b 58 }