File content as of revision 1:bc2db3bff4bb:

#include "mbed.h"
#include "MODSERIAL.h"
#include "HIDScope.h"

#define A1HP -1.999214978283642
#define A0HP 0.999214978283642
#define B1HP -1.943446330323158
#define B0HP 0.945001709500376
#define TSAMP 0.01


AnalogIn    emg0(PTB1);
MODSERIAL pc(USBTX,USBRX);
HIDScope scope(2);
Ticker timer;
float filter(float);
float emg_value;
static float y,x1=0,y1=0,x2=0,y2=0;
volatile bool looptimerflag;


void read()
{
    emg_value=emg0.read_u16();
}

float filter(float emg0_value)
{
    y = y1*B1HP-y2*B0HP-x1*A1HP+x2*A0HP;
    x2 = x1;
    x1 = emg0_value;
    y2 = y1;
    y1 = y;
    return y;
}

void viewer()
{
    scope.set(0,emg_value);
    scope.set(1,y);
    scope.send();
}

void setlooptimerflag(void)
{
    looptimerflag = true;
}

int main()
{
    pc.baud(115200);
    timer.attach(setlooptimerflag,TSAMP);
    //timer.attach(scope,0.05);
    while(1) {
        while(!looptimerflag)
            looptimerflag = false;
        read();
        y = filter(emg_value);
        viewer();
    }
}