不韋 呂 / Mbed 2 deprecated Demo_IIR_Filter

IirCascade クラスの使用例（低域通過フィルタ）． Example for IirCascade class (lowpass filter).

Dependencies:   UITDSP_ADDA UIT_IIR_Filter mbed

main.cpp@2:3f33fd1975ca, 2015-09-11 (annotated)

Committer:
MikamiUitOpen
Date:
Fri Sep 11 08:50:41 2015 +0000
Revision:
2:3f33fd1975ca
Parent:
1:19144f5db82a 
3

Who changed what in which revision?

UserRevisionLine numberNew contents of line
MikamiUitOpen 0:6de881bdce72 1 //------------------------------------------------------------------------------
MikamiUitOpen 0:6de881bdce72 2 // IirCascade クラスの使用例（低域通過フィルタ）
MikamiUitOpen 0:6de881bdce72 3 // Example for IirCascade class (lowpass filter)
MikamiUitOpen 1:19144f5db82a 4 // 2015/09/11, Copyright (c) 2015 MIKAMI, Naoki
MikamiUitOpen 0:6de881bdce72 5 //------------------------------------------------------------------------------
MikamiUitOpen 0:6de881bdce72 6
MikamiUitOpen 0:6de881bdce72 7 #include "ADC_BuiltIn.hpp"
MikamiUitOpen 0:6de881bdce72 8 #include "DAC_MCP4922.hpp"
MikamiUitOpen 0:6de881bdce72 9
MikamiUitOpen 0:6de881bdce72 10 #include "IIR_Cascade.hpp"
MikamiUitOpen 0:6de881bdce72 11 #include "Coefficients.hpp" // Coeffisients for the IIR filter
MikamiUitOpen 0:6de881bdce72 12
MikamiUitOpen 0:6de881bdce72 13 using namespace Mikami; // must be declared
MikamiUitOpen 0:6de881bdce72 14
MikamiUitOpen 0:6de881bdce72 15 const int FS_ = 16000; // sampling frequency: 10 kHz
MikamiUitOpen 0:6de881bdce72 16 ADC_BuiltIn adc_(A0, FS_); // for A0 of built-in ADC
MikamiUitOpen 0:6de881bdce72 17 DAC_MCP4922 myDac_; // for external DAC
MikamiUitOpen 0:6de881bdce72 18 DigitalIn sw_(D2, PullDown); // for rotary dip switch
MikamiUitOpen 0:6de881bdce72 19
MikamiUitOpen 0:6de881bdce72 20 // Object for lowpass filter
MikamiUitOpen 1:19144f5db82a 21 IirCascade<ORDER_> lpf_(g0_, ck_);
MikamiUitOpen 0:6de881bdce72 22
MikamiUitOpen 0:6de881bdce72 23 int main()
MikamiUitOpen 0:6de881bdce72 24 {
MikamiUitOpen 0:6de881bdce72 25 myDac_.ScfClockTim3(700000); // cutoff frequency of smoothing LPF: 7 kHz
MikamiUitOpen 0:6de881bdce72 26
MikamiUitOpen 0:6de881bdce72 27 lpf_.Clear(); // clear internal buffer in lowpass filter
MikamiUitOpen 0:6de881bdce72 28
MikamiUitOpen 0:6de881bdce72 29 while (true)
MikamiUitOpen 0:6de881bdce72 30 {
MikamiUitOpen 0:6de881bdce72 31 float xn = adc_.Read(); // read input signal
MikamiUitOpen 0:6de881bdce72 32 //-----------------------------------------------
MikamiUitOpen 0:6de881bdce72 33
MikamiUitOpen 0:6de881bdce72 34 float yn = lpf_.Execute(xn); // execute LPF
MikamiUitOpen 0:6de881bdce72 35
MikamiUitOpen 0:6de881bdce72 36 //-----------------------------------------------
MikamiUitOpen 0:6de881bdce72 37 if (sw_ == 0) myDac_.Write(xn); // through
MikamiUitOpen 0:6de881bdce72 38 else myDac_.Write(yn); // filtered output
MikamiUitOpen 0:6de881bdce72 39 }
MikamiUitOpen 0:6de881bdce72 40 }
MikamiUitOpen 1:19144f5db82a 41