File content as of revision 10:c7140e085ff3:

#include "mbed.h"
#include "MODSERIAL.h"
#include "HIDScope.h"
#include <iostream>

#define A1LP    0.018180963222803
#define A0LP     0.016544013176248
#define B1LP    -1.718913340044714
#define B0LP     0.753638316443765

#define A1HP    -1.999801878951505
#define A0HP  0.999801878951505
#define B1HP   -1.971717601075000
#define B0HP  0.972111984032897

#define A0N 0.99436777112
#define A1N -1.89139989664
#define A2N 0.99436777112
#define B1N 1.89070035439
#define B2N -0.988036

#define TSAMP 0.001

AnalogIn    emg1(PTB1);
AnalogIn    emg2(PTB0);
MODSERIAL pc(USBTX,USBRX);
HIDScope scope(6);
Ticker timer;
float emg_value1, ylp1, yhp1, yn1;
float emg_value2, ylp2, yhp2, yn2;
volatile bool looptimerflag;
float ysum1 = 0, yave1=0, ysum2 =0, yave2=0 ;

//filters signaal 1
float readEMG1()
{
    emg_value1=emg1.read();
    return emg_value1;
}

float notchfilter1(float emg_value1)
{
    static float yn1,x1=0,x2=0,y1=0,y2=0,x;
    x = emg_value1;
    yn1 = A0N*x + A1N*x1+A2N*x2+B1N*y1+B2N*y2;
    x2 = x1;
    x1 = x;
    y2 = y1;
    y1 = yn1;
    return yn1;
}


float hpfilter1(float yn1)
{
    static float x1=0,y1=0,x2=0, y2=0,x;
    x = yn1;
    yhp1 = x + A1HP*x1 + A0HP*x2 - B1HP*y1 - B0HP*y2;
    x2 = x1;
    x1 = x;
    y2 = y1;
    y1 = yhp1;
    return yhp1;
}

float lpfilter1(float yhp1)
{
    static float x1=0,y1=0,x2=0, y2=0,x;
    x = yhp1;
    ylp1 = A1LP*x1-B1LP*y1+A0LP*x2-B0LP*y2;
    x2 = x1;
    x1 = x;
    y2 = y1;
    y1 = ylp1;
    return ylp1;
}
//filters emg singaal 2
float readEMG2()
{
    emg_value2=emg2.read();
    return emg_value2;
}

float notchfilter2(float emg_value2)
{
    static float yn2,x1=0,x2=0,y1=0,y2=0,x;
    x = emg_value2;
    yn2 = A0N*x + A1N*x1+A2N*x2+B1N*y1+B2N*y2;
    x2 = x1;
    x1 = x;
    y2 = y1;
    y1 = yn2;
    return yn2;
}


float hpfilter2(float yn2)
{
    static float x1=0,y1=0,x2=0, y2=0,x;
    x = yn2;
    yhp2 = x + A1HP*x1 + A0HP*x2 - B1HP*y1 - B0HP*y2;
    x2 = x1;
    x1 = x;
    y2 = y1;
    y1 = yhp2;
    return yhp2;
}

float lpfilter2(float yhp2)
{
    static float x1=0,y1=0,x2=0, y2=0,x;
    x = yhp2;
    ylp1 = A1LP*x1-B1LP*y1+A0LP*x2-B0LP*y2;
    x2 = x1;
    x1 = x;
    y2 = y1;
    y1 = ylp2;
    return ylp2;
}


void viewer()
{
    scope.set(0,emg_value1);
    scope.set(1,ylp1);
    scope.set(2,yave1);
    scope.set(3,emg_value2);
    scope.set(4,ylp2);
    scope.set(5,yave2);

    scope.send();
}

void setlooptimerflag(void)
{
    looptimerflag = true;
}

int main()
{
    pc.baud(115200);
    timer.attach(setlooptimerflag,TSAMP);
    int n = 0; //n and m are used for the loops underneath
    int m = 0;
    while(1) {

        while(!looptimerflag) /* do nothing */;
        looptimerflag = false;

        emg_value1 = readEMG1();
        emg_value2 = readEMG2();

        yn1 = notchfilter1(emg_value1);
        yn2 = notchfilter2(emg_value2);

        yhp1 = hpfilter1(yn1);   //function hpfilter
        yhp2 = hpfilter2(yn2);

        ylp1 = lpfilter1(yhp1);       //function filter
        ylp2 = lpfilter2(yhp2);

        ysum1 = ysum1+sqrt(ylp1*ylp1);
        ysum2 = ysum2+sqrt(ylp2*ylp2);

        n++;
        m++;
        if(n==100) {
            yave1 = ysum1/100;
            ysum1 = 0;
            n = 0;
        }
        if(m==1000){
            yave2 = ysum2/100;
            ysum2 = 0;
            m=0;
        }

            

        viewer();                  //function hidscope


    }
}