Diff: main.cpp

Revision:

3:5f89484f8c84

Parent:

2:281d8c268a8e

Child:

4:82c807b7685e

--- a/main.cpp	Wed Feb 14 23:27:29 2018 +0000
+++ b/main.cpp	Tue Feb 27 13:58:05 2018 +0000
@@ -24,30 +24,25 @@
 AnalogIn pulse_in(PTB0);
 AnalogOut o(PTE30);
 DigitalOut led(PTD5);
-float xi,ypast,y,sum;//absolute max
-float alpha=0.8;
-int no;
+float xi,ypast,y,alpha=0.5;//absolute max
+float v[80]; int q=0;
 bool first=true;
+
 void get_pulse()
 {
-    xi=(float)pulse_in;
+   if(q==80) q=0;
+   xi=(float)pulse_in;
     //noise reduction algorithm
     if(!first)//noise filtering procedure
     {
-        y=alpha*xi+ (1-alpha)*ypast;
+        y= (alpha*xi)+ ((1-alpha)*ypast);
+        ypast=y;    
     }
     else 
         first=false;
-    if(y>0.6)//make the led blink to the heartbeat when signal reaches a certain high region, it will stay lit till the signal decreases below that value
-    {
-        led=1;
-    }
-    else
-    {
-        led=0;
-    }
-    //pc.printf("%.3f, %.3f\n",xi,y);
-    ypast=y;sum+=y;no++;
+   v[q]=xi;
+   o=v[q];
+   q++;
 }
 
 
@@ -114,6 +109,20 @@
 
 //END OF DISPLAY FUNCTIONS
 
+void detect_pulse()
+{
+    if(slope(5,25,v[5],v[25])>SOMETHING NEED TESTING and slope(40,50,v[40],v[50])<SOMETHING NEEDS TESTING)
+    //then the pulse is where it is supposed to be 
+    //so out put it with regard to 0 
+
+}
+
+inline float slope(float a1, float a2, float b1, float b2)
+{
+    return (float)((b2-b1)/(a2-a1));
+}
+    
+
 void splash_screen()
 {
     setup_dot_matrix ();      /* setup matric */
@@ -137,12 +146,14 @@
     clear();
 }
 
+
+
 int main()
 {
     pulse.attach(&get_pulse,0.0125);//attach the interrupt thing so it starts the ISR every 0.0125 s
     splash_screen();//wait for the pulse to be stable by showing stuff on the display so the user is happy knowing he is gay
     while(1)
     {
-        o=(sum*100)/no-1;//attempt at doing the running average which at the moment does not work
+        
     }
 }