File content as of revision 40:14d93245afc4:

//#include "mbed.h"
#include "TFC.h"
#include <iostream>
#include <stdio.h>
//#include "serialib.h"

const float AGGRESSIVE = .55;
const float MODERATE =.45;
const float CONSERVATIVE =.33;
const float STOP =0;
const float PROTECTION_THRESHOLD_UPPER =.7;
const float PROTECTION_THRESHOLD_LOWER =-.7;
const float TURN_FORWARD_ACCEL =0.045;
const float TURN_BACKWARD_ACCEL =0.025;
const float SERVO_CAN_MOVE_IN_ONE_FRAME =0.1;
const float SERVO_MAX =.5;

const int BLACK_THRESHOLD =63;
const int LINE_SCAN_LENGTH =128;


DigitalOut myled(LED1);

int main()
{
    //run this before anything
    TFC_Init();

    //variables
    float current_servo_position = 0;
    float previous_servo_position = 0;
    float current_left_motor_speed = 0;
    float current_right_motor_speed = 0;
    
    float proportional = 0;
    float last_proportional = 0;
    float integral = 0;
    float derivative = 0;
    float output = 0;
    
    // gains on prop, int, der
    // subject to change, need to fine tune
    float kp = 1.8960;
    float ki = 0.6170;
    float kd = 1.5590;
    
    bool rear_motor_enable_flag = true;
    bool linescan_ping_pong = false;
    bool linescan_enable = true;

    int black_values_list[LINE_SCAN_LENGTH];
    int black_value_count = 0;
    int black_center_value = 0;
    int sum_black = 0;
    int violence_level = 0;
    
    int accelList[3];
    int lastAccessed = 0;

    int centers_List[50];
    
    int center_now = 63;
    int center_past_1 = 63;
    int center_past_2 = 63;
    int center_past_3 = 63;
    int center_past_4 = 63;
    
    int position = 0;
    int set_point = 63;
    int previous_error = 0;
    int error = 0;
    
    float increment = 0;
    int right_turn_count = 0;
    int left_turn_count = 0;

    for(int i = 0; i < 50; i++)
        centers_List[i] = 63;
    
    float left_counter  =0;
    float right_counter =0;
    bool turn_left=false;
    bool turn_right=false;
    bool need_decel=false;
    int num_of_straight =0;
    int num_of_left =0;
    int num_of_right=0;

    //servo is offset zero by some bullshit number
    float bullshit_offset = .068;

    // major loop
    while(1) {

        // initial motor stuff
        if(rear_motor_enable_flag) {
            TFC_HBRIDGE_ENABLE;


            // checking behavior level
            violence_level =  int(TFC_GetDIP_Switch());

            if (violence_level==3) {
                current_left_motor_speed  = -(AGGRESSIVE);
                current_right_motor_speed = AGGRESSIVE;
                increment = 0.02;
            }
            else if (violence_level==2) {
                current_left_motor_speed  = -(MODERATE);
                current_right_motor_speed = (MODERATE);
                increment = 0.03;
            }
            else if (violence_level==1) {
                current_left_motor_speed  = -(CONSERVATIVE);
                current_right_motor_speed = CONSERVATIVE;
                increment = 0.04;
            }
            else if (violence_level==0) {
                current_left_motor_speed  = STOP;
                current_right_motor_speed = STOP;
                TFC_SetMotorPWM(current_left_motor_speed, current_right_motor_speed);
            }
            else {
                current_left_motor_speed  = STOP;
                current_right_motor_speed = STOP;
                TFC_SetMotorPWM(current_left_motor_speed, current_right_motor_speed);
            }
            
            // protection block
            if(current_left_motor_speed >= PROTECTION_THRESHOLD_UPPER)
                current_left_motor_speed= PROTECTION_THRESHOLD_UPPER;
            if(current_right_motor_speed >= PROTECTION_THRESHOLD_UPPER)
                current_right_motor_speed = PROTECTION_THRESHOLD_UPPER;
            if(current_left_motor_speed <= PROTECTION_THRESHOLD_LOWER)
                current_left_motor_speed = PROTECTION_THRESHOLD_LOWER;
            if(current_right_motor_speed <= PROTECTION_THRESHOLD_LOWER)
                current_right_motor_speed = PROTECTION_THRESHOLD_LOWER;

        }// end motor enabled
        else {
            TFC_HBRIDGE_DISABLE;
        }// end motor disabled

        // camera stuff
        if (linescan_enable) {
            if (TFC_LineScanImageReady !=0) {

                if (linescan_ping_pong) {
                    //checking channel 0
                    
                    //checking center pixel, displays aprox value on leds
                    uint8_t shitnum = 1;
                    
                    // checking for center line (single line)
                    for (uint16_t i=10; i<118; i++) {
                        if ((*(TFC_LineScanImage0+i) < 425)) {
                            black_values_list[black_value_count] = i;
                            black_value_count++;
                        }
                    }

                    for(int i=0; i<black_value_count; i++) 
                        sum_black += black_values_list[i];

                    //update history
                    center_past_4= center_past_3;
                    center_past_3= center_past_2;
                    center_past_2= center_past_1;
                    center_past_1= center_now;
                    
                    center_now = sum_black / black_value_count;
                    
                    uint8_t num = 0;
                    
                    if(center_now > 10 && center_now < 45) // linear func
                        num = 1;
                    else if(center_now >= 45 && center_now < 65) // snap
                        num = 2;
                    else if(center_now > 64 && center_now < 64) // nothing zone
                        num = 15;
                    else if(center_now >= 65 && center_now < 83) // snap
                        num = 4;
                    else if(center_now >= 83 && center_now < 118) // linear func
                        num = 8;
                    
                    else
                        num = 0;
                    
                    // get rid of garbage data sets
                    if (black_value_count<2)
                        num = 0;
                    
                    if (black_value_count>30)
                    {
                        while(1)
                            TFC_SetMotorPWM(0, 0);
                    }
                    
                    TFC_SetBatteryLED(num);
                    
                    // best guess of center based on weighted average of history
                    black_center_value = center_now;
  
                    
                    // turn left
                    // hit wall a little bit on the right
                    if (num==8 and right_counter <.2 ) // only if we arent turning right
                    {
                        //turn away a little bit for each frame that is wall
                        if (left_counter >-.45)
                        {
                            if (center_now>100)
                                //left_counter -=.03; 
                                left_counter -=.027; 
                            else
                                //left_counter -=.05;   
                                left_counter -=.044; 
                        }
                                
                        if (left_counter <-.46)
                        {
                            num_of_left =0;
                        }
                            
                            
                        turn_left=true;
                        turn_right=false;
                    }
                    
                    // turn left real hard
                    // wall is close to center on right
                    if (num==4 and right_counter <.2) // only if we arent turning right
                    {
                        left_counter=-0.54;
                        turn_left=true;
                        turn_right=false;
                        
                        num_of_left =0;
                        need_decel=true;
                    }
                    
                    // turn right hard
                    // wall is close to center on left
                      else if (num==2 and left_counter >-.2)// only if we arent turning left
                    {
                        right_counter =.54;
                        turn_left=false;
                        turn_right=true;
                        
                        num_of_right =0;
                        need_decel=true;
                    }
                    
                    
                    // turn right
                    // hit wall a little bit on the left
                    else if (num==1 and left_counter >-.2) // only if we arent turning left
                    {    
                        //turn away a little bit for each frame that is wall
                        if (right_counter <.45)
                        {
                            if (center_now<28)
                                right_counter +=.03;
                            else
                                right_counter +=.05;
                        }        
              
                        if (right_counter >.46)
                        {
                            num_of_right =0;
                        }
              
                        turn_left=false;
                        turn_right=true;
                    }
                    

                   // going straight yesssss
                   else if (turn_right == false and turn_left == false and (violence_level !=0))
                    {
                        TFC_SetServo(0,(0.0+ bullshit_offset));
                        TFC_SetMotorPWM(current_left_motor_speed-(.00008*num_of_straight), current_right_motor_speed+(.00008*num_of_straight)); // --left is faster, ++right is faster
                        num_of_left = 0;
                        num_of_right= 0;
                        if (violence_level !=0)
                            num_of_straight++;
                    }
                   
                    else{}
                    
                    //dealwiththeshit
                    // set servo and motors according to how much left we need to turn
                    if(turn_left and (violence_level !=0))
                    {
                        num_of_straight = 0; // no longer on a straight
                        num_of_right = 0;
                        num_of_left++;
                        turn_right = false;  
                        
                        if (left_counter + bullshit_offset > -.30)
                            TFC_SetServo(0,left_counter + bullshit_offset ); // set turning servo
                        else
                            TFC_SetServo(0, -.30); 
                        
                        // normalize to center each frame
                        // left turning is - servo
                        if(left_counter > -.2) // small turn, normalize quickly
                            left_counter += .009;      
                        else                // hard turn, normalize slowly
                            left_counter += .008;
                                
                        // no longer turning boolean        
                        if (left_counter > (0+ bullshit_offset))
                            turn_left = false;

                        if (need_decel) // need to deal with the decel
                            {
                                TFC_SetMotorPWM(current_left_motor_speed+(.5*left_counter), current_right_motor_speed-(.4*left_counter));  // ++left is slowed,--right is slowed 
                                need_decel = false;
                            }
                        else  //  turning speeds 
                            TFC_SetMotorPWM(current_left_motor_speed+(.26*left_counter), current_right_motor_speed+(.36*left_counter)+(.0001*num_of_left));  //  ++left is slowed, ++right is faster
                        }// end of turn left
                    
                    // set servo and motors according to how much right we need to turn
                    if(turn_right and (violence_level !=0))
                    {
                        num_of_straight = 0; // no longer going straight
                        num_of_right++;
                        num_of_left=0;
                        turn_left =false;
                        
                        if (right_counter - bullshit_offset < .5)
                            TFC_SetServo(0,right_counter - bullshit_offset); // set servo
                        else 
                            TFC_SetServo(0,.5);
                        
                        // normalize to center each frame
                        // right turning is + servo
                        if(right_counter < .2) // small turn, normalize quickly
                            right_counter -= .017;        
                        else                // hard turn, normalize slowly
                            right_counter -= .01;
                        
                        
                        // no longer turning boolean
                        if (right_counter < (0+ bullshit_offset))
                            turn_right = false;
                            
                        if(need_decel)// need to deal with the decel
                            {
                                TFC_SetMotorPWM(current_left_motor_speed+(.4*right_counter), current_right_motor_speed-(.5*right_counter));  // ++left is slowed,--right is slowed 
                                need_decel = false;
                            }
                        else    //  turning speeds 
                            TFC_SetMotorPWM(current_left_motor_speed-(.35*right_counter)-(.0001*num_of_right), current_right_motor_speed-(.25*right_counter));  //  --left is faster, --right is slowed      
                        }   // end with turn right


                    // clearing values for next image processing round
                    black_value_count = 0;
                    sum_black = 0;
                    // end image processing

                    linescan_ping_pong = false;
                } // end checking channel 0
                
                else { //checking channel 1
                    linescan_ping_pong = true;
                }

                TFC_LineScanImageReady = 0;  // since we used it, we reset the flag
            }// end imageready
        }// end linescan stuff
    } // end major loop
}// end main