Diff: main.cpp

Revision:

0:6de881bdce72

Child:

1:19144f5db82a

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Thu Sep 03 00:46:24 2015 +0000
@@ -0,0 +1,40 @@
+//------------------------------------------------------------------------------
+//  IirCascade クラスの使用例（低域通過フィルタ）
+//  Example for IirCascade class (lowpass filter)
+//  2015/09/03, Copyright (c) 2015 MIKAMI, Naoki
+//------------------------------------------------------------------------------
+
+#include "ADC_BuiltIn.hpp"
+#include "DAC_MCP4922.hpp"
+
+#include "IIR_Cascade.hpp"
+#include "Coefficients.hpp"     // Coeffisients for the IIR filter
+
+using namespace Mikami;         // must be declared
+
+const int FS_ = 16000;          // sampling frequency: 10 kHz
+ADC_BuiltIn adc_(A0, FS_);      // for A0 of built-in ADC
+DAC_MCP4922 myDac_;             // for external DAC
+DigitalIn sw_(D2, PullDown);    // for rotary dip switch
+
+// Object for lowpass filter
+IirCascade<ORDER_> lpf_(ck_, g0_);
+
+int main()
+{
+    myDac_.ScfClockTim3(700000);    // cutoff frequency of smoothing LPF: 7 kHz
+
+    lpf_.Clear();   // clear internal buffer in lowpass filter
+  
+    while (true)
+    {
+        float xn = adc_.Read();         // read input signal
+        //-----------------------------------------------
+
+        float yn = lpf_.Execute(xn);    // execute LPF
+        
+        //-----------------------------------------------
+        if (sw_ == 0) myDac_.Write(xn); // through
+        else          myDac_.Write(yn); // filtered output
+    }
+}