Revision 0:e934e95962bd, committed 2014-06-24

Comitter:

macht

Date:

Tue Jun 24 04:44:48 2014 +0000

Commit message:

Sin wave generation class using D/A converter(LPC1768)

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Sinwave.cpp	Tue Jun 24 04:44:48 2014 +0000
@@ -0,0 +1,24 @@
+#include "mbed.h"
+#include "Sinwave.h"
+
+Sinwave::Sinwave(PinName DAport,float amplitude,float frequency):DAport_(DAport){
+    int i;
+    float pi = 3.1415;
+    cycle_ = 1.0/(frequency*10.0);
+    for(i = 0;i < 10;i++){
+        outputs_[i] = amplitude*0.5 * (float)sin(2*pi*frequency*cycle_*i) + 0.5;
+    }
+}
+void Sinwave::update(){
+    static int i = 0;
+    DAport_.write(outputs_[i]);
+    i++;
+    i = i % 10;
+}
+void Sinwave::start(){
+     output_int_.attach(this,&Sinwave::update,cycle_);
+}
+void Sinwave::stop(){
+    output_int_.detach();
+}
+    
\ No newline at end of file

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Sinwave.h	Tue Jun 24 04:44:48 2014 +0000
@@ -0,0 +1,17 @@
+#ifndef SINWAVE_H_
+#define SINWAVE_H_
+#include"mbed.h"
+
+class Sinwave{
+    public:
+        Sinwave(PinName DAport,float amplitude,float frequency);
+        void start();
+        void stop();
+    private:
+        void update();
+        float outputs_[10];
+        float cycle_;
+        Ticker output_int_;
+        AnalogOut DAport_;
+};
+#endif
\ No newline at end of file