Diff: wave.cpp

Revision:

10:159f38636ed4

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/wave.cpp	Tue Dec 01 18:59:42 2015 +0000
@@ -0,0 +1,82 @@
+/*
+* wave.cpp
+* 
+*/
+
+#include "mbed.h"
+#include "wave.h"
+#include "para.h"
+#include "menu.h"
+Serial pc(USBTX, USBRX);
+AnalogOut  aout(p18);
+
+// from global variable
+extern para mypara;
+int waveform_type = mypara.get_type();
+int freq = mypara.get_freq();
+float amp = mypara.get_amp();
+float offset = mypara.get_offset();
+
+
+int datapoint_counter=0;
+float duty_cycle=0.2;
+int length_waveform=100;
+float time_interv=1.0/freq/length_waveform;
+uint16_t waveform[100];
+int x;
+const double pi = 3.14;
+void generate_waveform_datapoints(){
+    float t=0;
+     
+    //------if sine wave--------
+    if (waveform_type==0){  
+        for (int counter=0; counter<length_waveform; counter++){
+            x=amp/3.3*cos(2*pi*freq*t)+offset/3.3;
+            waveform[counter]=(uint16_t) (x*65535);      
+            t += time_interv;
+        }
+    }
+    
+    //------if square wave--------   
+    if (waveform_type==1){  
+        for (int counter=0; counter<length_waveform; counter++){
+            if (counter<=length_waveform*duty_cycle){
+                x=amp/3.3+offset/3.3;
+            }else{
+                x=-1.0*amp/3.3+offset/3.3;
+            }
+            waveform[counter]=(uint16_t) (x*65535);   
+        }           
+    }
+    
+    //------if triangle wave---------  
+    if (waveform_type==2){  
+        for (int counter=0; counter<length_waveform/2; counter++){
+            x=amp/1.65*(2.0*counter/length_waveform-0.5)+offset/3.3;
+            waveform[counter]=(uint16_t) (x*65535);   
+        } 
+        
+        for (int counter=length_waveform/2; counter<length_waveform; counter++){
+            waveform[counter]=waveform[length_waveform-counter-1];
+        } 
+                  
+    }
+}
+
+
+
+void output_waveform_datapoints(){
+    pc.printf("%d",freq);
+    for (int counter=0; counter<length_waveform; counter++){
+        aout.write_u16(waveform[counter]);
+        wait(time_interv);
+    } 
+}
+
+
+void output_waveform_datapoints_timer_ISR(){ 
+        aout.write_u16(waveform[datapoint_counter]);
+        datapoint_counter++;
+        
+        if (datapoint_counter==length_waveform-1){datapoint_counter=0;}
+}
\ No newline at end of file