Revision 0:dca649a31d1c, committed 2014-07-09

Comitter:

s1204246

Date:

Wed Jul 09 14:34:33 2014 +0000

Commit message:

EMG filtering Wouter Doppenberg

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/MODSERIAL.lib	Wed Jul 09 14:34:33 2014 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/Sissors/code/MODSERIAL/#180e968a751e

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Wed Jul 09 14:34:33 2014 +0000
@@ -0,0 +1,99 @@
+#include "mbed.h"
+#include "MODSERIAL.h"
+
+//Define objects
+AnalogIn    emg0(PTB0); //Analog input
+DigitalOut      blue(LED_BLUE); //Digi output
+Ticker timer;
+MODSERIAL pc(USBTX,USBRX);
+
+ double numh1,numh2,denh2; //High pass filter coeffs
+ double numl1,numl2,numl3,numl4,denl2,denl3,denl4; //Low pass filter coeffs
+ double numn1,numn2,numn3,denn2,denn3; //Notch filter coeffs
+ double raw,xbr,x1br,hbr,h1br,h2br,nbr,n1br,n2br,yabsbr,yabs1br,yabs2br,yabs3br,lbr,l1br,l2br,l3br,signal,emggain; //Signal intermediates
+
+void looper()
+{
+    /*put raw emg value both in red and in emg_value*/
+    blue = raw = emg0.read();
+        xbr=(raw-0.5)*2.0;
+        hbr=xbr*numh1+x1br*numh2-h1br*denh2;
+        nbr=hbr*numn1+h1br*numn2+h2br*numn3-n1br*denn2-n2br*denn3;
+        yabsbr=abs(nbr);
+        lbr=yabsbr*numl1+yabs1br*numl2+yabs2br*numl3+yabs3br*numl4-l1br*denl2-l2br*denl3-l3br*denl4;
+        x1br=xbr;
+        h2br=h1br;
+        h1br=hbr;
+        n2br=n1br;
+        n1br=nbr;
+        yabs3br=yabs2br;
+        yabs2br=yabs1br;
+        yabs1br=yabsbr;
+        l3br=l2br;
+        l2br=l1br;
+        l1br=lbr;
+        signal=lbr*emggain;
+    /*send value to PC. use 6 digits after decimal sign*/
+    pc.printf("%f \n",signal);
+    /**When not using the LED, the above could also have been done this way:
+    * pc.printf("%.6\n", emg0.read());
+    */
+}
+
+int main()
+
+{  
+x1br=0;
+h2br=0;
+h1br=0;
+n2br=0;
+n1br=0;
+yabs3br=0;
+yabs2br=0;
+yabs1br=0;
+l3br=0;
+l2br=0;
+l1br=0;
+    
+    //Filtercoëfficienten.
+    //High pass, 30Hz, 1e orde, 4 ms.
+    numh1=0.839799649112263;
+    numh2=-0.839799649112263;
+    //denh1=1;
+    denh2=-0.679599298224526;
+    
+    //Notch filter, 50 Hz, -35 dB
+    numn1=0.991103635646810;
+    numn2=-1.603639368850131;
+    numn3=0.991103635646810;
+    //denn1=1;
+    denn2=-1.603639368850131;
+    denn3=0.982207271293620;
+
+    //Low pass, 3 Hz, 3e orde, 4 ms.
+    numl1=0.000001935454105;
+    numl2=0.000005806362315;
+    numl3=0.000005806362315;
+    numl4=0.000001935454105;
+    //denl1=1;
+    denl2=-2.949735839706348;
+    denl3=2.900726988355438;
+    denl4=-0.950975665016249;    
+    //emg gain
+    emggain=5;
+
+    /*setup baudrate. Choose the same in your program on PC side*/
+    pc.baud(115200);
+    /*set the period for the PWM to the red LED*/
+    //red.period_ms(2);
+    /**Here you attach the 'void looper(void)' function to the Ticker object
+    * The looper() function will be called every 0.001 seconds.
+    * Please mind that the parentheses after looper are omitted when using attach.
+    */
+    timer.attach(looper, 0.001);
+    while(1) //Loop
+    {
+      /*Empty!*/
+      /*Everything is handled by the interrupt routine now!*/
+    }
+}
\ No newline at end of file

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Wed Jul 09 14:34:33 2014 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/024bf7f99721
\ No newline at end of file