Diff: main.cpp

Revision:

0:90daceb61231

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Wed Jul 13 06:38:26 2011 +0000
@@ -0,0 +1,40 @@
+#include "mbed.h"
+
+#define PI 3.142
+#define AMP 0.8
+
+#define SIGNAL_OUTPUT_FREQ 25//usec
+// coz twice zone of human audibility
+AnalogOut signal(p18);
+AnalogIn adin(p17);
+
+Ticker t_wave;
+
+float freq;
+
+float wave_value;
+void sawtoothWave(){
+    wave_value+=freq*SIGNAL_OUTPUT_FREQ/1000000;
+    if(wave_value > 1.0)
+        wave_value = 0.0;
+    float output = AMP*wave_value;
+    signal = output;
+}
+
+float theata;
+void sinWave(){
+    theata += 2*PI*SIGNAL_OUTPUT_FREQ*freq/1000000;
+    if(theata > 2*PI)
+        theata = 0.0; 
+    float output = AMP*( sin(theata)+0.5 );
+    signal = output;
+}
+
+int main() {
+    wave_value = 0.0;
+    freq = 1000;
+    t_wave.attach_us(&sinWave , SIGNAL_OUTPUT_FREQ);
+    while(1){
+        freq = 5000*adin.read();
+    } 
+}