不韋 呂 / Mbed 2 deprecated UIT2_CombReverb

Reverb system using single comb filter for ST Nucleo F401RE.

Dependencies:   UIT_ADDA mbed

main.cpp@0:e2e604ed785d, 2014-10-31 (annotated)

Committer:
MikamiUitOpen
Date:
Fri Oct 31 07:56:04 2014 +0000
Revision:
0:e2e604ed785d
Child:
2:501cd3d93dd7
1

Who changed what in which revision?

UserRevisionLine numberNew contents of line
MikamiUitOpen 0:e2e604ed785d 1 //--------------------------------------------------------------
MikamiUitOpen 0:e2e604ed785d 2 // Reverb system using comb filter
MikamiUitOpen 0:e2e604ed785d 3 // 2014/10/31, Copyright (c) 2014 MIKAMI, Naoki
MikamiUitOpen 0:e2e604ed785d 4 //--------------------------------------------------------------
MikamiUitOpen 0:e2e604ed785d 5
MikamiUitOpen 0:e2e604ed785d 6 #include "mbed.h"
MikamiUitOpen 0:e2e604ed785d 7
MikamiUitOpen 0:e2e604ed785d 8 #include "ADC_Base.hpp" // for ADC not using interrupt
MikamiUitOpen 0:e2e604ed785d 9 #include "DAC_MCP4922.hpp" // for DAC MCP4922
MikamiUitOpen 0:e2e604ed785d 10 #include "ScfClockTim3.hpp" // for clock supplied to SCF
MikamiUitOpen 0:e2e604ed785d 11
MikamiUitOpen 0:e2e604ed785d 12 using namespace Mikami;
MikamiUitOpen 0:e2e604ed785d 13
MikamiUitOpen 0:e2e604ed785d 14 const int FS_ = 12000; // Sampling frequency: 12 kHz
MikamiUitOpen 0:e2e604ed785d 15 ADC_Base adc_(A0, FS_); // for AD
MikamiUitOpen 0:e2e604ed785d 16 DAC_MCP4922 myDac_; // for DA
MikamiUitOpen 0:e2e604ed785d 17
MikamiUitOpen 0:e2e604ed785d 18 const float G_C_ = 0.8f;
MikamiUitOpen 0:e2e604ed785d 19 const float G0_ = 2.0f*(1.0f - G_C_);
MikamiUitOpen 0:e2e604ed785d 20 const int M1 = 1153;
MikamiUitOpen 0:e2e604ed785d 21 float ynD[M1];
MikamiUitOpen 0:e2e604ed785d 22
MikamiUitOpen 0:e2e604ed785d 23 DigitalIn sw_(D2, PullDown);
MikamiUitOpen 0:e2e604ed785d 24
MikamiUitOpen 0:e2e604ed785d 25 int main()
MikamiUitOpen 0:e2e604ed785d 26 {
MikamiUitOpen 0:e2e604ed785d 27 ScfClockTim3(500000); // cutoff frequency: 5 kHz
MikamiUitOpen 0:e2e604ed785d 28
MikamiUitOpen 0:e2e604ed785d 29 for (int n=0; n<M1; n++) ynD[n] = 0.0f;
MikamiUitOpen 0:e2e604ed785d 30 int nD = 0;
MikamiUitOpen 0:e2e604ed785d 31
MikamiUitOpen 0:e2e604ed785d 32 while (true)
MikamiUitOpen 0:e2e604ed785d 33 {
MikamiUitOpen 0:e2e604ed785d 34 float xn = adc_.Read(); // Read from A0
MikamiUitOpen 0:e2e604ed785d 35 //-----------------------------------------------
MikamiUitOpen 0:e2e604ed785d 36
MikamiUitOpen 0:e2e604ed785d 37 float yn;
MikamiUitOpen 0:e2e604ed785d 38 if (sw_.read() == 1)
MikamiUitOpen 0:e2e604ed785d 39 {
MikamiUitOpen 0:e2e604ed785d 40 yn = ynD[nD];
MikamiUitOpen 0:e2e604ed785d 41 ynD[nD++] = G0_*xn + G_C_*yn;
MikamiUitOpen 0:e2e604ed785d 42 if (nD >= M1) nD = 0;
MikamiUitOpen 0:e2e604ed785d 43 }
MikamiUitOpen 0:e2e604ed785d 44 else
MikamiUitOpen 0:e2e604ed785d 45 yn = xn;
MikamiUitOpen 0:e2e604ed785d 46
MikamiUitOpen 0:e2e604ed785d 47 //-----------------------------------------------
MikamiUitOpen 0:e2e604ed785d 48 myDac_.Write(yn); // Write to DAC
MikamiUitOpen 0:e2e604ed785d 49 }
MikamiUitOpen 0:e2e604ed785d 50 }