Diff: main.cpp

Revision:

0:28696920540e

Child:

1:920c46269ce8

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Tue Oct 21 10:00:13 2014 +0000
@@ -0,0 +1,67 @@
+//--------------------------------------------------------------
+// Sin generator using sinf() function
+//      Analog Output: MCP4922 using SPI
+// 2014/10/20, 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_(DAC_MCP4922::DAC_A); // for DA
+
+int main()
+{
+    const float PI = 3.1415926536;
+    const float PI2 = PI*2;
+    ScfClockTim3(500000);       // cutoff frequency: 5 kHz
+
+    float phi = 0;
+    float dPhi = PI2*440.0f/(float)FS_;
+    
+    while (true)
+    {
+        float xn = adc_.Read();     // Dummy read for synchronization to Fs
+        //-----------------------------------------------
+        
+        float yn = (float)(0.8f*sinf(phi));
+        phi = phi + dPhi;
+        if (phi > PI) phi = phi -PI2;
+
+        //-----------------------------------------------
+        myDac_.Write(yn);           // Write to DAC
+    }
+}
+/*
+// Following version uses double type variable
+int main()
+{
+    const double PI = 3.1415926536;
+    const double PI2 = PI*2;
+    ScfClockTim3(500000);       // cutoff frequency: 5 kHz
+
+    double phi = 0;
+    double dPhi = PI2*440.0/(double)FS_;
+    
+    while (true)
+    {
+        float xn = adc_.Read();     // Dummy read to synchronize Fs
+        //-----------------------------------------------
+        dOut_.write(1);
+        
+        float yn = (float)(0.8*sin(phi));
+        phi = phi + dPhi;
+        if (phi > PI) phi = phi -PI2;
+
+        dOut_.write(0);
+        //-----------------------------------------------
+        myDac_.Write(yn);           // Write to DAC
+    }
+}
+*/
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