不韋 呂 / Mbed 2 deprecated UIT2_CombReverb

Reverb system using single comb filter for ST Nucleo F401RE.

Dependencies:   UIT_ADDA mbed

main.cpp@3:263a67664a35, 2014-11-15 (annotated)

Committer:
MikamiUitOpen
Date:
Sat Nov 15 06:00:22 2014 +0000
Revision:
3:263a67664a35
Parent:
2:501cd3d93dd7 
4

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 2:501cd3d93dd7 3 // 2014/11/12, 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
MikamiUitOpen 0:e2e604ed785d 11 using namespace Mikami;
MikamiUitOpen 0:e2e604ed785d 12
MikamiUitOpen 0:e2e604ed785d 13 const int FS_ = 12000; // Sampling frequency: 12 kHz
MikamiUitOpen 0:e2e604ed785d 14 ADC_Base adc_(A0, FS_); // for AD
MikamiUitOpen 0:e2e604ed785d 15 DAC_MCP4922 myDac_; // for DA
MikamiUitOpen 0:e2e604ed785d 16
MikamiUitOpen 0:e2e604ed785d 17 const float G_C_ = 0.8f;
MikamiUitOpen 0:e2e604ed785d 18 const float G0_ = 2.0f*(1.0f - G_C_);
MikamiUitOpen 0:e2e604ed785d 19 const int M1 = 1153;
MikamiUitOpen 0:e2e604ed785d 20 float ynD[M1];
MikamiUitOpen 0:e2e604ed785d 21
MikamiUitOpen 0:e2e604ed785d 22 DigitalIn sw_(D2, PullDown);
MikamiUitOpen 0:e2e604ed785d 23
MikamiUitOpen 0:e2e604ed785d 24 int main()
MikamiUitOpen 0:e2e604ed785d 25 {
MikamiUitOpen 2:501cd3d93dd7 26 myDac_.ScfClockTim3(500000); // cutoff frequency: 5 kHz
MikamiUitOpen 0:e2e604ed785d 27
MikamiUitOpen 0:e2e604ed785d 28 for (int n=0; n<M1; n++) ynD[n] = 0.0f;
MikamiUitOpen 0:e2e604ed785d 29 int nD = 0;
MikamiUitOpen 0:e2e604ed785d 30
MikamiUitOpen 0:e2e604ed785d 31 while (true)
MikamiUitOpen 0:e2e604ed785d 32 {
MikamiUitOpen 0:e2e604ed785d 33 float xn = adc_.Read(); // Read from A0
MikamiUitOpen 0:e2e604ed785d 34 //-----------------------------------------------
MikamiUitOpen 0:e2e604ed785d 35
MikamiUitOpen 0:e2e604ed785d 36 float yn;
MikamiUitOpen 0:e2e604ed785d 37 if (sw_.read() == 1)
MikamiUitOpen 0:e2e604ed785d 38 {
MikamiUitOpen 0:e2e604ed785d 39 yn = ynD[nD];
MikamiUitOpen 0:e2e604ed785d 40 ynD[nD++] = G0_*xn + G_C_*yn;
MikamiUitOpen 0:e2e604ed785d 41 if (nD >= M1) nD = 0;
MikamiUitOpen 0:e2e604ed785d 42 }
MikamiUitOpen 0:e2e604ed785d 43 else
MikamiUitOpen 0:e2e604ed785d 44 yn = xn;
MikamiUitOpen 0:e2e604ed785d 45
MikamiUitOpen 0:e2e604ed785d 46 //-----------------------------------------------
MikamiUitOpen 0:e2e604ed785d 47 myDac_.Write(yn); // Write to DAC
MikamiUitOpen 0:e2e604ed785d 48 }
MikamiUitOpen 0:e2e604ed785d 49 }