Diff: main.cpp

Revision:

0:22eafb1b3124

Child:

2:ed56284ebeb7

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Wed Oct 29 09:46:52 2014 +0000
@@ -0,0 +1,38 @@
+//--------------------------------------------------------------
+// １次の IIR フィルタ
+//      Analog Input : A0
+//      Analog Output: MCP4922 using SPI
+// 2014/10/29, 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
+
+int main()
+{
+    ScfClockTim3(500000);       // cutoff frequency: 5 kHz
+
+    const float A1 = 0.8f;
+    const float B0 = 1.0f - A1;
+    float yn = 0;
+    
+    while (true)
+    {
+        float xn = adc_.Read();     // Read from A0
+        //-----------------------------------------------
+
+        yn = A1*yn + B0*xn;
+
+        //-----------------------------------------------
+        myDac_.Write(yn);           // Write to DAC
+    }
+}