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Reverb system using single comb filter for ST Nucleo F401RE.
main.cpp
- Committer:
- MikamiUitOpen
- Date:
- 2014-11-12
- Revision:
- 2:501cd3d93dd7
- Parent:
- 0:e2e604ed785d
File content as of revision 2:501cd3d93dd7:
//-------------------------------------------------------------- // Reverb system using comb filter // 2014/11/12, Copyright (c) 2014 MIKAMI, Naoki //-------------------------------------------------------------- #include "mbed.h" #include "ADC_Base.hpp" // for ADC not using interrupt #include "DAC_MCP4922.hpp" // for DAC MCP4922 using namespace Mikami; const int FS_ = 12000; // Sampling frequency: 12 kHz ADC_Base adc_(A0, FS_); // for AD DAC_MCP4922 myDac_; // for DA const float G_C_ = 0.8f; const float G0_ = 2.0f*(1.0f - G_C_); const int M1 = 1153; float ynD[M1]; DigitalIn sw_(D2, PullDown); int main() { myDac_.ScfClockTim3(500000); // cutoff frequency: 5 kHz for (int n=0; n<M1; n++) ynD[n] = 0.0f; int nD = 0; while (true) { float xn = adc_.Read(); // Read from A0 //----------------------------------------------- float yn; if (sw_.read() == 1) { yn = ynD[nD]; ynD[nD++] = G0_*xn + G_C_*yn; if (nD >= M1) nD = 0; } else yn = xn; //----------------------------------------------- myDac_.Write(yn); // Write to DAC } }