File content as of revision 4:117c0bb09513:

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

//Define objects
AnalogIn    emg_biceps(PTB0);
AnalogIn    emg_triceps(PTB1);
AnalogIn    emg_flexoren(PTB2);
AnalogIn    emg_extensoren(PTB3); //Analog input
PwmOut      red(LED_RED); //PWM output
Ticker timer;
MODSERIAL pc(USBTX,USBRX,64,1024);

#define offset_biceps 0 // offset ruwe invoer met adapter motoren, waar toepassen?

//high pass filter constantes 15Hz cutoff 4e orde, Fs = 312,5Hz (geeft een wat mooiere waarde voor periode en is geen veelvoud van 50Hz)
#define NUM0 0.6731 // constante
#define NUM1 -2.6925 // z^-1
#define NUM2 4.0388 // z^-2etc.
#define NUM3 -2.6925
#define NUM4 0.6731

#define DEN0 1 // constante
#define DEN1 -3.2133
#define DEN2 3.9348
#define DEN3 -2.1689
#define DEN4 0.4531

//lowpass filter constantes 4Hz 4e orde, Fs = 312,5 Hz
#define NUM0_3 0.00000236 // constante
#define NUM1_3 0.00000944 // z^-1
#define NUM2_3 0.00001415 // z^-2etc.
#define NUM3_3 0.00000944
#define NUM4_3 0.00000236

#define DEN0_3 1 // constante
#define DEN1_3 -3.7899
#define DEN2_3 5.3914
#define DEN3_3 -3.4119
#define DEN4_3 0.8104

float std_dev (float input, int sig_number){
 //   define variables
    static int startcount=0;
    float sum;
    int size = 20;
    float sig_out;
    float mean;
    static int count_biceps=0;
    static int count_triceps=0;
    static int count_flexoren=0;
    static int count_extensoren=0;
    static float keeper_biceps[20];
    static float keeper_triceps[20];
    static float keeper_flexoren[20];
    static float keeper_extensoren[20];
    
    if (startcount >= size)
        {//ja, dan gewoon std dev nemen, want keeper is al vol
        switch(sig_number){
        case 1:
            keeper_biceps[count_biceps]=input;
            count_biceps++;
            if(count_biceps >= size)
                count_biceps=0;
            //sizeof(keeper_biceps)/sizeof(float);
            for(int i=0; i < size; i++)
                {sum+=keeper_biceps[i];        
                }
            mean=sum/size;
            sum=0;
            for(int i=0; i < size; i++)
            {sum+=(keeper_biceps[i]-mean)*(keeper_biceps[i]-mean);
            }
            sig_out=sqrt(sum/size);
            sum=0;
            break;
        case 2:
            keeper_triceps[count_triceps]=input;
            count_triceps++;
            if(count_triceps==size)
                count_triceps=0;
            //sizeof(keeper_triceps) / sizeof(float);
            for(int i=0; i < size; i++){
                sum+=keeper_triceps[i];        
            }
            mean=sum/size;
            sum=0;
            for(int i=0; i < size; i++){
                sum+=(keeper_triceps[i]-mean)*(keeper_triceps[i]-mean);
            }
            sig_out=sqrt(sum/size);
            sum=0;
            break;
        case 3:
            keeper_flexoren[count_flexoren]=input;
            count_flexoren++;
            if(count_flexoren==size) count_flexoren=0;
    
            //size=sizeof(keeper_flexoren)/sizeof(float);
            for(int i=0; i < size; i++){
                sum+=keeper_flexoren[i];        
            }
            mean=sum/size;
            sum=0;
            for(int i=0; i < size; i++){
                sum+=(keeper_flexoren[i]-mean)*(keeper_flexoren[i]-mean);
            }
            sig_out=sqrt(sum/size);
            sum=0;
            break;
        case 4:
            keeper_extensoren[count_extensoren]=input;
            count_extensoren++;
            if(count_extensoren==size) count_extensoren=0;
    
            //size=sizeof(keeper_extensoren)/sizeof(float);
            for(int i=0; i < size; i++){
                sum+=keeper_extensoren[i];        
            }
            mean=sum/size;
            sum=0;
            for(int i=0; i < size; i++){
                sum+=(keeper_extensoren[i]-mean)*(keeper_extensoren[i]-mean);
            }
            sig_out=sqrt(sum/size);
            sum=0;
            break;
            } // einde switch
        return sig_out;
        } // einde if startcount ...
        else
            {startcount+=1;
            switch(sig_number){
            case 1:
                keeper_biceps[count_biceps]=input;
                count_biceps++;
                if(count_biceps >= size)
                    count_biceps=0;
                break;
            case 2:
                keeper_triceps[count_triceps]=input;
                count_triceps++;
                if(count_triceps >= size)
                    count_triceps=0;
                break;
            case 3:
                keeper_flexoren[count_flexoren]=input;
                count_flexoren++;
                if(count_flexoren >= size)
                    count_flexoren=0;
                break;
            case 4:
                keeper_extensoren[count_extensoren]=input;
                count_extensoren++;
                if(count_extensoren >= size)
                    count_extensoren=0;
                break;    
            } // einde switch
        } // einde else
} // einde std_dev
   
float filter(int sig_number){
    float sig_out;
    // eerst variabelen definieren
    
    //biceps
        //filter 1
    float in0_biceps =0;
    static float in1_biceps =0, in2_biceps = 0, in3_biceps = 0, in4_biceps = 0;
    static float out0_biceps = 0, out1_biceps = 0 , out2_biceps = 0, out3_biceps = 0, out4_biceps = 0;
        
        //filter 3
    float in0_3_biceps =0;
    static float in1_3_biceps =0, in2_3_biceps = 0, in3_3_biceps = 0, in4_3_biceps = 0;
    static float out0_3_biceps = 0, out1_3_biceps = 0 , out2_3_biceps = 0, out3_3_biceps = 0, out4_3_biceps = 0;
        
   
    //triceps
        //filter 1
    float in0_triceps =0;
    static float in1_triceps =0, in2_triceps = 0, in3_triceps = 0, in4_triceps = 0;
    static float out0_triceps = 0, out1_triceps = 0 , out2_triceps = 0, out3_triceps = 0, out4_triceps = 0;
        
        //filter 3
    float in0_3_triceps =0;
    static float in1_3_triceps =0, in2_3_triceps = 0, in3_3_triceps = 0, in4_3_triceps = 0;
    static float out0_3_triceps = 0, out1_3_triceps = 0 , out2_3_triceps = 0, out3_3_triceps = 0, out4_3_triceps = 0;
        
    
    //flexoren
        //filter 1
    float in0_flexoren =0;
    static float in1_flexoren =0, in2_flexoren = 0, in3_flexoren = 0, in4_flexoren = 0;
    static float out0_flexoren = 0, out1_flexoren = 0 , out2_flexoren = 0, out3_flexoren = 0, out4_flexoren = 0;
       
        //filter 3
    float in0_3_flexoren =0;
    static float in1_3_flexoren =0, in2_3_flexoren = 0, in3_3_flexoren = 0, in4_3_flexoren = 0;
    static float out0_3_flexoren = 0, out1_3_flexoren = 0 , out2_3_flexoren = 0, out3_3_flexoren = 0, out4_3_flexoren = 0;
        
    
    //extensoren
        //filter 1
    float in0_extensoren =0;
    static float in1_extensoren =0, in2_extensoren = 0, in3_extensoren = 0, in4_extensoren = 0;
    static float out0_extensoren = 0, out1_extensoren = 0 , out2_extensoren = 0, out3_extensoren = 0, out4_extensoren = 0;
        
        //filter 3
    float in0_3_extensoren =0;
    static float in1_3_extensoren =0, in2_3_extensoren = 0, in3_3_extensoren = 0, in4_3_extensoren = 0;
    static float out0_3_extensoren = 0, out1_3_extensoren = 0 , out2_3_extensoren = 0, out3_3_extensoren = 0, out4_3_extensoren = 0;
        
    
    
    switch(sig_number){            
        case 1:        
            // signaal filteren op 15 Hz HIGHPASS
            in4_biceps = in3_biceps; in3_biceps = in2_biceps; in2_biceps = in1_biceps; in1_biceps = in0_biceps;
            in0_biceps = emg_biceps.read() - offset_biceps;
            out4_biceps = out3_biceps; out3_biceps = out2_biceps; out2_biceps = out1_biceps; out1_biceps = out0_biceps;           
            out0_biceps = (NUM0*in0_biceps + NUM1*in1_biceps + NUM2*in2_biceps + NUM3*in3_biceps + NUM4*in4_biceps - DEN1*out1_biceps - DEN2*out2_biceps - DEN3*out3_biceps - DEN4*out4_biceps ) / DEN0;                      
            /*
            //signaal filteren op 5Hz LOWPASS
            in4_3_biceps = in3_3_biceps; in3_3_biceps = in2_3_biceps; in2_3_biceps = in1_3_biceps; in1_3_biceps = in0_3_biceps;
            in0_3_biceps = abs(out0_biceps); // ruw - offset -> filter 1 -> stdev (-> filter 3)
            out4_3_biceps = out3_3_biceps; out3_3_biceps = out2_3_biceps; out2_3_biceps = out1_3_biceps; out1_3_biceps = out0_3_biceps;           
            out0_3_biceps = (NUM0_3*in0_3_biceps + NUM1_3*in1_3_biceps + NUM2_3*in2_3_biceps + NUM3_3*in3_3_biceps + NUM4_3*in4_3_biceps - DEN1_3*out1_3_biceps - DEN2_3*out2_3_biceps - DEN3_3*out3_3_biceps - DEN4_3*out4_3_biceps ) / DEN0_3;    
            */
            
            sig_out = out0_biceps;
            break;
        case 2:
            // signaal filteren op 15 Hz HIGHPASS
            in4_triceps = in3_triceps; in3_triceps = in2_triceps; in2_triceps = in1_triceps; in1_triceps = in0_triceps;
            in0_triceps = emg_triceps.read() - offset_biceps;
            out4_triceps = out3_triceps; out3_triceps = out2_triceps; out2_triceps = out1_triceps; out1_triceps = out0_triceps;           
            out0_triceps = (NUM0*in0_triceps + NUM1*in1_triceps + NUM2*in2_triceps + NUM3*in3_triceps + NUM4*in4_triceps - DEN1*out1_triceps - DEN2*out2_triceps - DEN3*out3_triceps - DEN4*out4_triceps ) / DEN0;                      
            
       
            //signaal filteren op 5Hz LOWPASS
            /*in4_3_triceps = in3_3_triceps; in3_3_triceps = in2_3_triceps; in2_3_triceps = in1_3_triceps; in1_3_triceps = in0_3_triceps;
            in0_3_triceps = abs(out0_triceps);
            out4_3_triceps = out3_3_triceps; out3_3_triceps = out2_3_triceps; out2_3_triceps = out1_3_triceps; out1_3_triceps = out0_3_triceps;           
            out0_3_triceps = (NUM0_3*in0_3_triceps + NUM1_3*in1_3_triceps + NUM2_3*in2_3_triceps + NUM3_3*in3_3_triceps + NUM4_3*in4_3_triceps - DEN1_3*out1_3_triceps - DEN2_3*out2_3_triceps - DEN3_3*out3_3_triceps - DEN4_3*out4_3_triceps ) / DEN0_3;    
            */
            
            sig_out = out0_triceps;
            break;
        case 3:
            // signaal filteren op 15 Hz HIGHPASS
            in4_flexoren = in3_flexoren; in3_flexoren = in2_flexoren; in2_flexoren = in1_flexoren; in1_flexoren = in0_flexoren;
            in0_flexoren = emg_flexoren.read();
            out4_flexoren = out3_flexoren; out3_flexoren = out2_flexoren; out2_flexoren = out1_flexoren; out1_flexoren = out0_flexoren;           
            out0_flexoren = (NUM0*in0_flexoren + NUM1*in1_flexoren + NUM2*in2_flexoren + NUM3*in3_flexoren + NUM4*in4_flexoren - DEN1*out1_flexoren - DEN2*out2_flexoren - DEN3*out3_flexoren - DEN4*out4_flexoren ) / DEN0;                      
    /*
            
            //signaal filteren op 5Hz LOWPASS
            in4_3_flexoren = in3_3_flexoren; in3_3_flexoren = in2_3_flexoren; in2_3_flexoren = in1_3_flexoren; in1_3_flexoren = in0_3_flexoren;
            in0_3_flexoren = abs(out0_2_flexoren);
            out4_3_flexoren = out3_3_flexoren; out3_3_flexoren = out2_3_flexoren; out2_3_flexoren = out1_3_flexoren; out1_3_flexoren = out0_3_flexoren;           
            out0_3_flexoren = (NUM0_3*in0_3_flexoren + NUM1_3*in1_3_flexoren + NUM2_3*in2_3_flexoren + NUM3_3*in3_3_flexoren + NUM4_3*in4_3_flexoren - DEN1_3*out1_3_flexoren - DEN2_3*out2_3_flexoren - DEN3_3*out3_3_flexoren - DEN4_3*out4_3_flexoren ) / DEN0_3;    
            
            
            */
            sig_out = out0_flexoren;
            break;
        case 4:
            // signaal filteren op 15 Hz HIGHPASS
            in4_extensoren = in3_extensoren; in3_extensoren = in2_extensoren; in2_extensoren = in1_extensoren; in1_extensoren = in0_extensoren;
            in0_extensoren = emg_extensoren.read();
            out4_extensoren = out3_extensoren; out3_extensoren = out2_extensoren; out2_extensoren = out1_extensoren; out1_extensoren = out0_extensoren;           
            out0_extensoren = (NUM0*in0_extensoren + NUM1*in1_extensoren + NUM2*in2_extensoren + NUM3*in3_extensoren + NUM4*in4_extensoren - DEN1*out1_extensoren - DEN2*out2_extensoren - DEN3*out3_extensoren - DEN4*out4_extensoren ) / DEN0;                      
    /*
            
            //signaal filteren op 5Hz LOWPASS
            in4_3_extensoren = in3_3_extensoren; in3_3_extensoren = in2_3_extensoren; in2_3_extensoren = in1_3_extensoren; in1_3_extensoren = in0_3_extensoren;
            in0_3_extensoren = abs(out0_2_extensoren);
            out4_3_extensoren = out3_3_extensoren; out3_3_extensoren = out2_3_extensoren; out2_3_extensoren = out1_3_extensoren; out1_3_extensoren = out0_3_extensoren;           
            out0_3_extensoren = (NUM0_3*in0_3_extensoren + NUM1_3*in1_3_extensoren + NUM2_3*in2_3_extensoren + NUM3_3*in3_3_extensoren + NUM4_3*in4_3_extensoren - DEN1_3*out1_3_extensoren - DEN2_3*out2_3_extensoren - DEN3_3*out3_3_extensoren - DEN4_3*out4_3_extensoren ) / DEN0_3;    
            
            
     */       
            sig_out = out0_extensoren;
            break;
    }
    return sig_out;
}

void looper()
{   float emg_value_biceps;
    float emg_value_triceps;
    float emg_value_flexoren;
    float emg_value_extensoren;
    float dy;
    //static int sig_count = 1;
emg_value_biceps=std_dev(filter(1),1);
emg_value_triceps=std_dev(filter(2),2);
emg_value_flexoren = std_dev(filter(3),3);
emg_value_extensoren = std_dev(filter(4),4);

    if(emg_value_biceps < 4.5)
        emg_value_biceps=0;
    else if (emg_value_biceps > 13)
         emg_value_biceps = 13;
    //emg_value_biceps =  emg_value_biceps;
    
    if(emg_value_triceps < 2.5)
        emg_value_biceps=0;
    else if (emg_value_biceps > 10)
         emg_value_biceps = 10;
    //emg_value_triceps =  emg_value_triceps;
    
    if(emg_value_flexoren < 2)
        emg_value_flexoren=0;
    else if (emg_value_flexoren > 8)
         emg_value_flexoren = 8;
    emg_value_flexoren = 2*emg_value_flexoren;
    
    if(emg_value_extensoren < 5)
        emg_value_extensoren=0;
    else if (emg_value_extensoren > 13)
         emg_value_extensoren = 13;
 
dy = emg_value_biceps - emg_value_triceps;
dx = 2*(emg_value_flexoren - emg_value_extensoren);
    
    if(pc.rxBufferGetSize(0)-pc.rxBufferGetCount() > 30)
        pc.printf("%.6f, %.6f, %.6f\n",emg_value_biceps, emg_value_triceps, dy);
    /**When not using the LED, the above could also have been done this way:
    * pc.printf("%.6\n", emg0.read());
    */
}

int main()
{
    /*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 1/Fs seconds.
    * Please mind that the parentheses after looper are omitted when using attach.
    */
    timer.attach(looper,0.0032); //invullen in seconde. .0032 is niet eens afgerond, dus vandaar die frequentie.
    while(1) //Loop
    {
      /*Empty!*/
      /*Everything is handled by the interrupt routine now!*/
    }
}