CQpub0 Mikami / Mbed 2 deprecated FIR_LPF_Symmetry

The experiment using this program is introduced on "Interface" No.12, CQ publishing Co.,Ltd, 2014. 本プログラムを使った実験は，CQ出版社のインターフェース 2014年12月号で紹介しています．

Dependencies:   DSProcessingIO mbed

FIR_LPF_Symmetry.cpp@0:4498a5360dde, 2014-07-15 (annotated)

Committer:
CQpub0Mikami
Date:
Tue Jul 15 08:21:30 2014 +0000
Revision:
0:4498a5360dde
1

Who changed what in which revision?

UserRevisionLine numberNew contents of line
CQpub0Mikami 0:4498a5360dde 1 //--------------------------------------------------------------
CQpub0Mikami 0:4498a5360dde 2 // FIR filter: Even order, Symmetric structure of direct form
CQpub0Mikami 0:4498a5360dde 3 //
CQpub0Mikami 0:4498a5360dde 4 // Copyright (c) 2014 MIKAMI, Naoki, 2014/06/20
CQpub0Mikami 0:4498a5360dde 5 //--------------------------------------------------------------
CQpub0Mikami 0:4498a5360dde 6
CQpub0Mikami 0:4498a5360dde 7 #include "mbed.h"
CQpub0Mikami 0:4498a5360dde 8 #include "AdcInternal.hpp"
CQpub0Mikami 0:4498a5360dde 9 #include "MCP4922Single.hpp"
CQpub0Mikami 0:4498a5360dde 10 #include "coefficientsSym_200.hpp"
CQpub0Mikami 0:4498a5360dde 11 #include "FIR_Symmetry.hpp"
CQpub0Mikami 0:4498a5360dde 12
CQpub0Mikami 0:4498a5360dde 13 using namespace Mikami;
CQpub0Mikami 0:4498a5360dde 14
CQpub0Mikami 0:4498a5360dde 15 // sampling frequency
CQpub0Mikami 0:4498a5360dde 16 const float FS_ = 10.0e3f;
CQpub0Mikami 0:4498a5360dde 17
CQpub0Mikami 0:4498a5360dde 18 Adc adc_(A0);
CQpub0Mikami 0:4498a5360dde 19 Dac dacA_(Dac::DAC_A);
CQpub0Mikami 0:4498a5360dde 20 Ticker timer_; // for timer interrupt
CQpub0Mikami 0:4498a5360dde 21
CQpub0Mikami 0:4498a5360dde 22 FirSymmetry<ORDER_> lpf(hm_);
CQpub0Mikami 0:4498a5360dde 23
CQpub0Mikami 0:4498a5360dde 24 void TimerIsr()
CQpub0Mikami 0:4498a5360dde 25 {
CQpub0Mikami 0:4498a5360dde 26 float xn = adc_.Read(); // input
CQpub0Mikami 0:4498a5360dde 27
CQpub0Mikami 0:4498a5360dde 28 // Execute FIR filter
CQpub0Mikami 0:4498a5360dde 29 float yn = lpf.Execute(xn);
CQpub0Mikami 0:4498a5360dde 30
CQpub0Mikami 0:4498a5360dde 31 dacA_.Write(yn); // output
CQpub0Mikami 0:4498a5360dde 32 }
CQpub0Mikami 0:4498a5360dde 33
CQpub0Mikami 0:4498a5360dde 34 int main()
CQpub0Mikami 0:4498a5360dde 35 {
CQpub0Mikami 0:4498a5360dde 36 timer_.attach_us(&TimerIsr, 1.0e6f/FS_);
CQpub0Mikami 0:4498a5360dde 37
CQpub0Mikami 0:4498a5360dde 38 while (true) {} // infinite loop
CQpub0Mikami 0:4498a5360dde 39 }
CQpub0Mikami 0:4498a5360dde 40