Diff: main.cpp

Revision:

0:e2e604ed785d

Child:

2:501cd3d93dd7

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Fri Oct 31 07:56:04 2014 +0000
@@ -0,0 +1,50 @@
+//--------------------------------------------------------------
+// Reverb system using comb filter
+// 2014/10/31, Copyright (c) 2014 MIKAMI, Naoki
+//--------------------------------------------------------------
+
+#include "mbed.h"
+
+#include "ADC_Base.hpp"         // for ADC not using interrupt
+#include "DAC_MCP4922.hpp"      // for DAC MCP4922
+#include "ScfClockTim3.hpp"     // for clock supplied to SCF
+
+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()
+{
+    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
+    }
+}