main.cpp

00001 //--------------------------------------------------------------
00002 // FIR フィルタ，転置形
00003 //      Analog Input : A0
00004 //      Analog Output: MCP4922 using SPI
00005 // 2014/11/12, Copyright (c) 2014 MIKAMI, Naoki
00006 //--------------------------------------------------------------
00007 
00008 #include "mbed.h"
00009 
00010 #include "ADC_Base.hpp"         // for ADC not using interrupt
00011 #include "DAC_MCP4922.hpp"      // for DAC MCP4922
00012 #include "Coefficients_200_LPF.hpp"
00013 
00014 using namespace Mikami;
00015 
00016 const int FS_ = 12000;  // Sampling frequency: 12 kHz
00017 ADC_Base adc_(A0, FS_); // for AD
00018 DAC_MCP4922 myDac_;     // for DA
00019 
00020 int main()
00021 {
00022     myDac_.ScfClockTim3(500000);    // cutoff frequency: 5 kHz
00023 
00024     float un[ORDER_+1];
00025     for (int n=0; n<=ORDER_; n++)
00026         un[n] = 0;
00027     
00028     while (true)
00029     {
00030         float xn = adc_.Read(); // Read from A0
00031         //-----------------------------------------------
00032 
00033         for (int k=0; k<ORDER_; k++)
00034             un[k] = hm_[k]*xn + un[k+1];
00035         un[ORDER_] = hm_[ORDER_]*xn;
00036 
00037         //-----------------------------------------------
00038         myDac_.Write(un[0]);    // Write to DAC
00039     }
00040 }