不韋 呂 / Mbed 2 deprecated UIT2_FIR_LPF_Symmetry

FIR filter of symmetric coefficiemts for ST Nucleo F401RE.

Dependencies:   UIT_ADDA mbed

main.cpp@1:93d2771b8797, 2014-10-21 (annotated)

Committer:
MikamiUitOpen
Date:
Tue Oct 21 09:07:46 2014 +0000
Revision:
1:93d2771b8797
Parent:
0:4912234b4155
Child:
3:89bae16a8d2c
2

Who changed what in which revision?

UserRevisionLine numberNew contents of line
MikamiUitOpen 0:4912234b4155 1 //--------------------------------------------------------------
MikamiUitOpen 0:4912234b4155 2 // FIR フィルタ，係数の対称性を利用する構造
MikamiUitOpen 0:4912234b4155 3 // Analog Input : A0
MikamiUitOpen 0:4912234b4155 4 // Analog Output: MCP4922 using SPI
MikamiUitOpen 0:4912234b4155 5 // 2014/10/21, Copyright (c) 2014 MIKAMI, Naoki
MikamiUitOpen 0:4912234b4155 6 //--------------------------------------------------------------
MikamiUitOpen 0:4912234b4155 7
MikamiUitOpen 0:4912234b4155 8 #include "mbed.h"
MikamiUitOpen 0:4912234b4155 9
MikamiUitOpen 1:93d2771b8797 10 #include "ADC_Base.hpp" // for ADC not using interrupt
MikamiUitOpen 0:4912234b4155 11 #include "DAC_MCP4922.hpp" // for DAC MCP4922
MikamiUitOpen 0:4912234b4155 12 #include "ScfClockTim3.hpp" // for clock supplied to SCF
MikamiUitOpen 0:4912234b4155 13 #include "Coefficients_200_LPF_Sym.hpp"
MikamiUitOpen 0:4912234b4155 14
MikamiUitOpen 0:4912234b4155 15 using namespace Mikami;
MikamiUitOpen 0:4912234b4155 16
MikamiUitOpen 0:4912234b4155 17 const int FS_ = 12000; // Sampling frequency: 12 kHz
MikamiUitOpen 0:4912234b4155 18 ADC_Base adc_(A0, FS_); // for AD
MikamiUitOpen 0:4912234b4155 19 DAC_MCP4922 myDac_(DAC_MCP4922::DAC_A); // for DA
MikamiUitOpen 0:4912234b4155 20
MikamiUitOpen 0:4912234b4155 21 int main()
MikamiUitOpen 0:4912234b4155 22 {
MikamiUitOpen 0:4912234b4155 23 ScfClockTim3(500000); // cutoff frequency: 5 kHz
MikamiUitOpen 0:4912234b4155 24
MikamiUitOpen 0:4912234b4155 25 float xn[ORDER_+1];
MikamiUitOpen 0:4912234b4155 26 for (int n=0; n<=ORDER_; n++)
MikamiUitOpen 0:4912234b4155 27 xn[n] = 0;
MikamiUitOpen 0:4912234b4155 28
MikamiUitOpen 0:4912234b4155 29 while (true)
MikamiUitOpen 0:4912234b4155 30 {
MikamiUitOpen 0:4912234b4155 31 xn[0] = adc_.Read(); // Read from A0
MikamiUitOpen 0:4912234b4155 32 //-----------------------------------------------
MikamiUitOpen 0:4912234b4155 33
MikamiUitOpen 0:4912234b4155 34 float yn = hm_[ORDER_/2]*xn[ORDER_/2];
MikamiUitOpen 0:4912234b4155 35 for (int k=0; k<ORDER_/2; k++)
MikamiUitOpen 0:4912234b4155 36 yn = yn + hm_[k]*(xn[k] + xn[ORDER_-k]);
MikamiUitOpen 0:4912234b4155 37
MikamiUitOpen 0:4912234b4155 38 for (int k=ORDER_; k>0; k--)
MikamiUitOpen 0:4912234b4155 39 xn[k] = xn[k-1]; // move input signals
MikamiUitOpen 0:4912234b4155 40
MikamiUitOpen 0:4912234b4155 41 //-----------------------------------------------
MikamiUitOpen 0:4912234b4155 42 myDac_.Write(yn); // Write to DAC
MikamiUitOpen 0:4912234b4155 43 }
MikamiUitOpen 0:4912234b4155 44 }