kazunori ogasawara
Sin wave generation class using D/A converter(LPC1768)
Dependents: agic_touch_panel_v3
Diff: Sinwave.cpp
- Revision:
- 0:e934e95962bd
--- /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();
+}
+
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