Diff: main.cpp

Revision:

0:6f71e969a0b5

Child:

1:cfcd4825fe81

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Wed Oct 28 08:11:57 2015 +0000
@@ -0,0 +1,372 @@
+#include "mbed.h"
+//#include "read_filter_emg.h"
+//included for fabs() function
+#include <math.h>
+#include "HIDScope.h"
+#include <iostream>
+#include "QEI.h"
+
+
+
+
+Serial pc(USBTX, USBRX);
+
+Ticker HIDScope_timer;
+Ticker Filteren_timer;
+Ticker aansturen;
+
+HIDScope scope(4);
+
+// defining flags
+volatile bool Flag_filteren = false;
+volatile bool Flag_HIDScope = false;
+volatile bool left_movement = false;
+volatile bool right_movement = false;
+
+// making function flags.
+void Go_flag_filteren()
+{
+    Flag_filteren = true;
+}
+
+void Go_flag_HIDScope()
+{
+    Flag_HIDScope  = true;
+}
+
+AnalogIn analog_emg_left(A0);
+AnalogIn analog_emg_right(A1);
+
+double input_left = 0 ;
+double input_right = 0 ;
+//double input = 0;
+double filter_signal_hid_left = 0;
+double filter_signal_hid_right = 0;
+//double input_right = 0;
+// defining threshold
+  double high_threshold = 1200;
+    double low_threshold = 500;
+
+//*** making the v for everything and conquer the world***
+
+//for Notchfilter
+double notch_v11=0;
+double notch_v21=0;
+double notch_v12=0;
+double notch_v22=0;
+double notch_v13=0;
+double notch_v23=0;
+
+//for highpass filter
+double high_v11=0;
+double high_v21=0;
+double high_v12=0;
+double high_v22=0;
+double high_v13=0;
+double high_v23=0;
+
+// for lowpasfilter
+double low_v11=0;
+double low_v21=0;
+double low_v12=0;
+double low_v22=0;
+double low_v13=0;
+double low_v23=0;
+
+// for moving average
+double n1 = 0;
+double n2 = 0;
+double n3 = 0;
+double n4 = 0;
+double n5 = 0;
+
+double filter_left;
+double filter_right;
+
+//general biquad filter that can be called in all the filter functions
+double biquad(double u, double &v1, double &v2, const double a1,
+              const double a2, const double b0, const double b1, const double b2)
+{
+    double v = u - a1*v1 - a2*v2;
+    double y = b0*v + b1*v1 + b2*v2;
+    //values of v2 and v1 are updated, as they are passed by reference
+    //they update globally
+    v2 = v1;
+    v1 = v;
+    return y;
+}
+
+double moving_average(double y, double &n1, double &n2, double &n3, double &n4, double &n5)
+{
+    double average = (y + n1 + n2 +n3 + n4 + n5)/5;
+    n5 = n4;
+    n4 = n3;
+    n3 = n2;
+    n2 = n1;
+    n1 = y;
+
+    return average;
+}
+/*
+double threshold(double signal, const double lowtreshold, const double hightreshold)
+{
+    if (signal > hightreshold)
+        left = true;
+    else if (signal <lowtreshold)
+        left = false;
+}
+*/
+//Specifying filter coefficients highpass
+
+/* notch filter with 3 cascaded biquads*/
+//first notch biquad
+const double notch1_a1 = -1.55951422433;
+const double notch1_a2 = 0.92705680308;
+const double notch1_b0 = 1.00000000000;
+const double notch1_b1 = -1.61854515325;
+const double notch1_b2 = 1.00000000000;
+
+//second notch biquad
+const double notch2_a1 = -1.54767435801;
+const double notch2_a2 = 0.96124842048;
+const double notch2_b0 = 1.00000000000;
+const double notch2_b1 = -1.61854515325;
+const double notch2_b2 = 1.00000000000;
+
+//third notch biquad
+const double notch3_a1 = -1.62600366964;
+const double notch3_a2 = 0.96453460373;
+const double notch3_b0 = 1.00000000000;
+const double notch3_b1 = -1.61854515325;
+const double notch3_b2 = 1.00000000000;
+
+/* high pass filter consists of three cascaded biquads
+ blow coefficients for those three biquads */
+//first high pass biquad
+const double highp1_a1 = -0.67538034389;
+const double highp1_a2 = 0.12769255668;
+const double highp1_b0 = 1.00000000000;
+const double highp1_b1 = -2.00000000000;
+const double highp1_b2 = 1.00000000000;
+
+//second high pass biquad
+const double highp2_a1 = -0.76475499450;
+const double highp2_a2 = 0.27692273367;
+const double highp2_b0 = 1.00000000000;
+const double highp2_b1 = -2.00000000000;
+const double highp2_b2 = 1.00000000000;
+
+//third high pass biquad
+const double highp3_a1 = -0.99216561242;
+const double highp3_a2 = 0.65663360837;
+const double highp3_b0 = 1.00000000000;
+const double highp3_b1 = -2.00000000000;
+const double highp3_b2 = 1.00000000000;
+
+/* lowpass filter consists of three cascaded biquads
+below the coefficients for those three biquads */
+//first low pass biquad
+const double lowp1_a1 = -1.05207469728;
+const double lowp1_a2 = 0.28586907478;
+const double lowp1_b0 = 1.00000000000;
+const double lowp1_b1 = 2.00000000000;
+const double lowp1_b2 = 1.00000000000;
+
+//second low pass biquad
+const double lowp2_a1 = -1.16338171052;
+const double lowp2_a2 = 0.42191097989;
+const double lowp2_b0 = 1.00000000000;
+const double lowp2_b1 = 2.00000000000;
+const double lowp2_b2 = 1.00000000000;
+
+//third low pass biquad
+const double lowp3_a1 = -1.42439823874;
+const double lowp3_a2 = 0.74093118112;
+const double lowp3_b0 = 1.00000000000;
+const double lowp3_b1 = 2.00000000000;
+const double lowp3_b2 = 1.00000000000;
+
+
+
+double Filteren(double input)
+{
+
+    input = input-0.45; //FIRST SUBTRACT MEAN THEN FILTER
+    //input_right = analog_emg_right.read();
+
+    // notch filter
+    double y1 = biquad(input, notch_v11, notch_v21, notch1_a1, notch1_a2, notch1_b0, notch1_b1, notch1_b2);
+    double y2 = biquad(y1, notch_v12, notch_v22, notch2_a1, notch2_a2, notch2_b0, notch2_b1, notch2_b2);
+    double y3 = biquad(y2, notch_v13, notch_v23, notch3_a1, notch3_a2, notch3_b0, notch3_b1, notch3_b2);
+
+    //higpass filter
+    double y4 = biquad(y3, high_v11, high_v21, highp1_a1, highp1_a2, highp1_b0, highp1_b1, highp1_b2);
+    double y5 = biquad(y4, high_v12, high_v22, highp2_a1, highp2_a2, highp2_b0, highp2_b1, highp2_b2);
+    double y6 = biquad(y5, high_v13, high_v23, highp3_a1, highp3_a2, highp3_b0, highp3_b1, highp3_b2);
+
+    //rectivier
+    double y7 = fabs(y6);
+
+    //lowpas filter cascade
+    double y8 = biquad(y7, low_v11, low_v21, lowp1_a1, lowp1_a2, lowp1_b0, lowp1_b1, lowp1_b2);
+    double y9 = biquad(y8, low_v12, low_v22, lowp2_a1, lowp2_a2, lowp2_b0, lowp2_b1, lowp2_b2);
+    double y10= biquad(y9, low_v13, low_v23, lowp3_a1, lowp3_a2, lowp3_b0, lowp3_b1, lowp3_b2);
+
+    // moving average
+    double filter_signal = moving_average(y10,n1,n2,n3,n4,n5);
+  
+    return(filter_signal);
+}
+
+/*************************************************************BEGIN motor control******************************************************************************************************/
+// Define pin for motor control
+DigitalOut directionPin(D4);
+PwmOut PWM(D5);
+DigitalIn buttonccw(PTA4);
+DigitalIn buttoncw(PTC6);
+
+QEI wheel (PTC10, PTC11, NC, 624); // Pin for counting (analog in)
+// define ticker
+
+// define rotation direction and begin possition
+const int cw = 1;
+const int ccw = 0;
+double setpoint = 0; //setpoint is in pulses
+
+
+// Controller gain proportional and intergrator
+const double motor1_Kp = 5; // more or les random number.
+const double motor1_Ki = 0;
+const double M1_timestep = 0.01; // reason ticker works with 100 Hz.
+double motor1_error_integraal = 0; // initial value of integral error
+// Defining pulses per revolution (calculating pulses to rotations in degree.)
+const double pulses_per_revolution = 4200 ;//8400 counts is aangegeven op de motor for x4.  10 - 30 counts oveshoot. for moter 1(tape)! Motor 2 almost the same(nice)
+/*
+double Rotation = -2; // rotation
+double movement = Rotation * pulses_per_revolution; // times 360 to make Rotations degree.
+*/
+
+// defining flags
+volatile bool flag_motor = false;
+
+// making function flags.
+void Go_flag_motor()
+{
+    flag_motor = true;
+}
+
+
+// To make a new setpoint
+double making_setpoint(double direction)
+{
+    if ( cw == direction) {
+        setpoint = setpoint + (pulses_per_revolution/40000);
+    }
+    if ( ccw == direction) {
+        setpoint = setpoint - (pulses_per_revolution/40000);
+    }
+    return(setpoint);
+
+}
+
+// Reusable P controller
+double PI(double error, const double Kp, const double Ki, double Ts, double &e_int)
+{
+
+    e_int = e_int + Ts * error;
+
+    double PI_output = (Kp * error) + (Ki * e_int);
+    return PI_output;
+}
+// Next task, measure the error and apply the output to the plant
+void motor1_Controller()
+{
+    double reference = setpoint; // setpoint is in pulses
+    double position = wheel.getPulses();
+    double error_pulses = (reference - position); // calculate the error in pulses
+    double error_rotation = error_pulses / pulses_per_revolution; //calculate how much the rotaions the motor has to turn
+
+    double output = abs(PI( error_rotation, motor1_Kp, motor1_Ki, M1_timestep, motor1_error_integraal ));
+
+    if(error_pulses > 0) {
+        directionPin.write(cw);
+
+    } else if(error_pulses < 0) {
+        directionPin.write(ccw);
+    } else {
+        output = 0;
+    }
+    PWM.write(output); // out of the if loop due to abs output
+
+
+}
+
+/*************************************************************END motor control******************************************************************************************************/
+
+void HIDScope_kijken()
+{
+    scope.set(0, analog_emg_left.read());
+    scope.set(1, filter_signal_hid_left);
+    scope.set(2, analog_emg_right.read());
+    scope.set(3, filter_signal_hid_right);
+    scope.send();
+}
+
+
+int main()
+{
+    aansturen.attach( &Go_flag_motor, 0.01f ); // 100 Hz // timer 0.00001f motor keeps spinning
+    HIDScope_timer.attach(&Go_flag_HIDScope, 0.02);
+    Filteren_timer.attach(&Go_flag_filteren,0.04);
+    while(1) {
+        if(Flag_filteren) {
+            Flag_filteren = false;
+           // filter left and set bool
+            filter_signal_hid_left = Filteren(analog_emg_left.read());
+
+            if (filter_signal_hid_left > high_threshold) {
+                left_movement = true;
+            } else if (filter_signal_hid_left < low_threshold) {
+                left_movement = false;
+            }
+            // make filter right and set bool
+            filter_signal_hid_right = Filteren(analog_emg_right.read());
+
+            if (filter_signal_hid_right > high_threshold) {
+                right_movement = true;
+            } else if (filter_signal_hid_right < low_threshold) {
+                right_movement = false;
+            }
+
+
+        }
+
+        if(Flag_HIDScope) {
+            Flag_HIDScope = false;
+            HIDScope_kijken();
+
+        }
+
+        if(flag_motor) {
+            flag_motor = false;
+            motor1_Controller();
+
+        }
+
+
+
+// Pussing buttons to get input signal
+
+        if(left_movement) {
+            setpoint = making_setpoint(cw);
+
+        }
+        if(right_movement) {
+            setpoint =  making_setpoint(ccw);
+        }
+    }
+}
+
+
+
+