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FIR filter of symmetric coefficiemts for ST Nucleo F401RE.
main.cpp
- Committer:
- MikamiUitOpen
- Date:
- 2014-10-21
- Revision:
- 0:4912234b4155
- Child:
- 1:93d2771b8797
File content as of revision 0:4912234b4155:
//-------------------------------------------------------------- // FIR フィルタ,係数の対称性を利用する構造 // Analog Input : A0 // Analog Output: MCP4922 using SPI // 2014/10/21, Copyright (c) 2014 MIKAMI, Naoki //-------------------------------------------------------------- #include "mbed.h" #include "ADC_Interrupt.hpp" // for ADC using interrupt #include "DAC_MCP4922.hpp" // for DAC MCP4922 #include "ScfClockTim3.hpp" // for clock supplied to SCF #include "Coefficients_200_LPF_Sym.hpp" using namespace Mikami; const int FS_ = 12000; // Sampling frequency: 12 kHz ADC_Base adc_(A0, FS_); // for AD DAC_MCP4922 myDac_(DAC_MCP4922::DAC_A); // for DA int main() { ScfClockTim3(500000); // cutoff frequency: 5 kHz float xn[ORDER_+1]; for (int n=0; n<=ORDER_; n++) xn[n] = 0; while (true) { xn[0] = adc_.Read(); // Read from A0 //----------------------------------------------- float yn = hm_[ORDER_/2]*xn[ORDER_/2]; for (int k=0; k<ORDER_/2; k++) yn = yn + hm_[k]*(xn[k] + xn[ORDER_-k]); for (int k=ORDER_; k>0; k--) xn[k] = xn[k-1]; // move input signals //----------------------------------------------- myDac_.Write(yn); // Write to DAC } }