// -*- tab-width: 4; Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*- //**************************************************************** // Function that will calculate the desired direction to fly and distance //**************************************************************** static byte navigate() { // waypoint distance from plane in meters // --------------------------------------- wp_distance = get_distance(¤t_loc, &next_WP); home_distance = get_distance(¤t_loc, &home); if (wp_distance < 0){ // something went very wrong return 0; } // target_bearing is where we should be heading // -------------------------------------------- target_bearing = get_bearing(¤t_loc, &next_WP); home_to_copter_bearing = get_bearing(&home, ¤t_loc); // nav_bearing will includes xtrac correction // ------------------------------------------ nav_bearing = target_bearing; return 1; } static bool check_missed_wp() { int32_t temp; temp = target_bearing - original_target_bearing; temp = wrap_180(temp); return (abs(temp) > 10000); //we pased the waypoint by 10 ° } // ------------------------------ static void calc_XY_velocity(){ // offset calculation of GPS speed: // used for estimations below 1.5m/s // our GPS is about 1m per static int32_t last_longitude = 0; static int32_t last_latitude = 0; static int16_t x_speed_old = 0; static int16_t y_speed_old = 0; // y_GPS_speed positve = Up // x_GPS_speed positve = Right // this speed is ~ in cm because we are using 10^7 numbers from GPS float tmp = 1.0/dTnav; // straightforward approach: ///* x_actual_speed = x_speed_old + (float)(g_gps->longitude - last_longitude) * scaleLongDown * tmp; y_actual_speed = y_speed_old + (float)(g_gps->latitude - last_latitude) * tmp; x_actual_speed = x_actual_speed >> 1; y_actual_speed = y_actual_speed >> 1; x_speed_old = x_actual_speed; y_speed_old = y_actual_speed; /* // Ryan Beall's forward estimator: int16_t x_speed_new = (float)(g_gps->longitude - last_longitude) * scaleLongDown* tmp; int16_t y_speed_new = (float)(g_gps->latitude - last_latitude) * tmp; x_actual_speed = x_speed_new + (x_speed_new - x_speed_old); y_actual_speed = y_speed_new + (y_speed_new - y_speed_old); x_speed_old = x_speed_new; y_speed_old = y_speed_new; */ last_longitude = g_gps->longitude; last_latitude = g_gps->latitude; } static void calc_location_error(struct Location *next_loc) { /* Becuase we are using lat and lon to do our distance errors here's a quick chart: 100 = 1m 1000 = 11m = 36 feet 1800 = 19.80m = 60 feet 3000 = 33m 10000 = 111m */ // X Error long_error = (float)(next_loc->lng - current_loc.lng) * scaleLongDown; // 500 - 0 = 500 Go East // Y Error lat_error = next_loc->lat - current_loc.lat; // 500 - 0 = 500 Go North } #define NAV_ERR_MAX 600 static void calc_loiter(int x_error, int y_error) { #if LOITER_RATE == 1 int16_t x_target_speed, y_target_speed; int16_t x_iterm, y_iterm; // East / West x_target_speed = g.pi_loiter_lon.get_p(x_error); // not contstrained yet //x_target_speed = constrain(x_target_speed, -250, 250); // limit to 2.5m/s travel speed x_rate_error = x_target_speed - x_actual_speed; // calc the speed error nav_lon = g.pid_loiter_rate_lon.get_pid(x_rate_error, dTnav); nav_lon = constrain(nav_lon, -3000, 3000); // 30° // North / South y_target_speed = g.pi_loiter_lat.get_p(y_error); //y_target_speed = constrain(y_target_speed, -250, 250); y_rate_error = y_target_speed - y_actual_speed; nav_lat = g.pid_loiter_rate_lat.get_pid(y_rate_error, dTnav); nav_lat = constrain(nav_lat, -3000, 3000); // 30° // copy over I term to Nav_Rate g.pid_nav_lon.set_integrator(g.pid_loiter_rate_lon.get_integrator()); g.pid_nav_lat.set_integrator(g.pid_loiter_rate_lat.get_integrator()); #else // no rate control on Loiter nav_lon = g.pid_loiter_rate_lon.get_pid(x_error, dTnav); nav_lat = g.pid_loiter_rate_lat.get_pid(y_error, dTnav); nav_lon = constrain(nav_lon, -3000, 3000); // 30° nav_lat = constrain(nav_lat, -3000, 3000); // 30° #endif // Wind I term based on location error, // limit windup /* x_error = constrain(x_error, -NAV_ERR_MAX, NAV_ERR_MAX); y_error = constrain(y_error, -NAV_ERR_MAX, NAV_ERR_MAX); x_iterm = g.pi_loiter_lon.get_i(x_error, dTnav); y_iterm = g.pi_loiter_lat.get_i(y_error, dTnav); nav_lat = nav_lat + y_iterm; nav_lon = nav_lon + x_iterm; */ /* int8_t ttt = 1.0/dTnav; int16_t t2 = g.pi_nav_lat.get_integrator(); // 1 2 3 4 5 6 7 8 9 10 Serial.printf("%d, %d, %d, %d, %d, %d, %d, %d, %d, %d\n", wp_distance, //1 y_error, //2 y_GPS_speed, //3 y_actual_speed, //4 ; y_target_speed, //5 y_rate_error, //6 nav_lat_p, //7 nav_lat, //8 y_iterm, //9 t2); //10 //*/ /* int16_t t1 = g.pid_nav_lon.get_integrator(); // X Serial.printf("%d, %1.4f, %d, %d, %d, %d, %d, %d, %d, %d\n", wp_distance, //1 dTnav, //2 x_error, //3 x_GPS_speed, //4 x_actual_speed, //5 x_target_speed, //6 x_rate_error, //7 nav_lat, //8 x_iterm, //9 t1); //10 //*/ } static void calc_nav_rate(int max_speed) { // push us towards the original track update_crosstrack(); // nav_bearing includes crosstrack float temp = (9000l - nav_bearing) * RADX100; // East / West x_rate_error = (cos(temp) * max_speed) - x_actual_speed; // 413 x_rate_error = constrain(x_rate_error, -1000, 1000); nav_lon = g.pid_nav_lon.get_pid(x_rate_error, dTnav); nav_lon = constrain(nav_lon, -3000, 3000); // North / South y_rate_error = (sin(temp) * max_speed) - y_actual_speed; // 413 y_rate_error = constrain(y_rate_error, -1000, 1000); // added a rate error limit to keep pitching down to a minimum nav_lat = g.pid_nav_lat.get_pid(y_rate_error, dTnav); nav_lat = constrain(nav_lat, -3000, 3000); // copy over I term to Loiter_Rate g.pid_loiter_rate_lon.set_integrator(g.pid_nav_lon.get_integrator()); g.pid_loiter_rate_lat.set_integrator(g.pid_nav_lat.get_integrator()); //int16_t x_iterm = g.pi_loiter_lon.get_i(x_rate_error, dTnav); //int16_t y_iterm = g.pi_loiter_lat.get_i(y_rate_error, dTnav); //nav_lon = nav_lon + x_iterm; //nav_lat = nav_lat + y_iterm; /* Serial.printf("max_sp %d,\t x_sp %d, y_sp %d,\t x_re: %d, y_re: %d, \tnav_lon: %d, nav_lat: %d, Xi:%d, Yi:%d, \t XE %d \n", max_speed, x_actual_speed, y_actual_speed, x_rate_error, y_rate_error, nav_lon, nav_lat, x_iterm, y_iterm, crosstrack_error); //*/ // nav_lat and nav_lon will be rotated to the angle of the quad in calc_nav_pitch_roll() /*Serial.printf("max_speed: %d, xspeed: %d, yspeed: %d, x_re: %d, y_re: %d, nav_lon: %ld, nav_lat: %ld ", max_speed, x_actual_speed, y_actual_speed, x_rate_error, y_rate_error, nav_lon, nav_lat);*/ } /*static void calc_nav_lon(int rate) { nav_lon = g.pid_nav_lon.get_pid(rate, dTnav); nav_lon = constrain(nav_lon, -3000, 3000); } static void calc_nav_lat(int rate) { nav_lat = g.pid_nav_lat.get_pid(rate, dTnav); nav_lat = constrain(nav_lat, -3000, 3000); } */ //static int16_t get_corrected_angle(int16_t desired_rate, int16_t rate_out) /*{ int16_t tt = desired_rate; // scale down the desired rate and square it desired_rate = desired_rate / 20; desired_rate = desired_rate * desired_rate; int16_t tmp = 0; if (tt > 0){ tmp = rate_out + (rate_out - desired_rate); tmp = max(tmp, rate_out); }else if (tt < 0){ tmp = rate_out + (rate_out + desired_rate); tmp = min(tmp, rate_out); } //Serial.printf("rate:%d, norm:%d, out:%d \n", tt, rate_out, tmp); return tmp; }*/ //wp_distance,ttt, y_error, y_GPS_speed, y_actual_speed, y_target_speed, y_rate_error, nav_lat, y_iterm, t2 // this calculation rotates our World frame of reference to the copter's frame of reference // We use the DCM's matrix to precalculate these trig values at 50hz static void calc_loiter_pitch_roll() { //Serial.printf("ys %ld, cx %1.4f, _cx %1.4f | sy %1.4f, _sy %1.4f\n", dcm.yaw_sensor, cos_yaw_x, _cos_yaw_x, sin_yaw_y, _sin_yaw_y); // rotate the vector auto_roll = (float)nav_lon * sin_yaw_y - (float)nav_lat * cos_yaw_x; auto_pitch = (float)nav_lon * cos_yaw_x + (float)nav_lat * sin_yaw_y; // flip pitch because forward is negative auto_pitch = -auto_pitch; } static int16_t calc_desired_speed(int16_t max_speed, bool _slow) { /* |< WP Radius 0 1 2 3 4 5 6 7 8m ...|...|...|...|...|...|...|...| 100 | 200 300 400cm/s | +|+ |< we should slow to 1.5 m/s as we hit the target */ // max_speed is default 600 or 6m/s if(_slow){ max_speed = min(max_speed, wp_distance / 2); max_speed = max(max_speed, 0); }else{ max_speed = min(max_speed, wp_distance); max_speed = max(max_speed, WAYPOINT_SPEED_MIN); // go at least 100cm/s } // limit the ramp up of the speed // waypoint_speed_gov is reset to 0 at each new WP command if(max_speed > waypoint_speed_gov){ waypoint_speed_gov += (int)(100.0 * dTnav); // increase at .5/ms max_speed = waypoint_speed_gov; } return max_speed; } static void update_crosstrack(void) { // Crosstrack Error // ---------------- if (abs(wrap_180(target_bearing - original_target_bearing)) < 4500) { // If we are too far off or too close we don't do track following float temp = (target_bearing - original_target_bearing) * RADX100; crosstrack_error = sin(temp) * (wp_distance * g.crosstrack_gain); // Meters we are off track line nav_bearing = target_bearing + constrain(crosstrack_error, -3000, 3000); nav_bearing = wrap_360(nav_bearing); }else{ nav_bearing = target_bearing; } } static int32_t get_altitude_error() { // Next_WP alt is our target alt // It changes based on climb rate // until it reaches the target_altitude return next_WP.alt - current_loc.alt; } static void clear_new_altitude() { alt_change_flag = REACHED_ALT; } static void set_new_altitude(int32_t _new_alt) { if(_new_alt == current_loc.alt){ next_WP.alt = _new_alt; target_altitude = _new_alt; alt_change_flag = REACHED_ALT; return; } // just to be clear next_WP.alt = current_loc.alt; // for calculating the delta time alt_change_timer = millis(); // save the target altitude target_altitude = _new_alt; // reset our altitude integrator alt_change = 0; // save the original altitude original_altitude = current_loc.alt; // to decide if we have reached the target altitude if(target_altitude > original_altitude){ // we are below, going up alt_change_flag = ASCENDING; //Serial.printf("go up\n"); }else if(target_altitude < original_altitude){ // we are above, going down alt_change_flag = DESCENDING; //Serial.printf("go down\n"); }else{ // No Change alt_change_flag = REACHED_ALT; //Serial.printf("reached alt\n"); } //Serial.printf("new alt: %d Org alt: %d\n", target_altitude, original_altitude); } static int32_t get_new_altitude() { // returns a new next_WP.alt if(alt_change_flag == ASCENDING){ // we are below, going up if(current_loc.alt >= target_altitude){ alt_change_flag = REACHED_ALT; } // we shouldn't command past our target if(next_WP.alt >= target_altitude){ return target_altitude; } }else if (alt_change_flag == DESCENDING){ // we are above, going down if(current_loc.alt <= target_altitude) alt_change_flag = REACHED_ALT; // we shouldn't command past our target if(next_WP.alt <= target_altitude){ return target_altitude; } } // if we have reached our target altitude, return the target alt if(alt_change_flag == REACHED_ALT){ return target_altitude; } int32_t diff = abs(next_WP.alt - target_altitude); int8_t _scale = 4; if (next_WP.alt < target_altitude){ // we are below the target alt if(diff < 200){ _scale = 5; } else { _scale = 4; } }else { // we are above the target, going down if(diff < 400){ _scale = 5; } if(diff < 100){ _scale = 6; } } // we use the elapsed time as our altitude offset // 1000 = 1 sec // 1000 >> 4 = 64cm/s descent by default int32_t change = (millis() - alt_change_timer) >> _scale; if(alt_change_flag == ASCENDING){ alt_change += change; }else{ alt_change -= change; } // for generating delta time alt_change_timer = millis(); return original_altitude + alt_change; } static int32_t wrap_360(int32_t error) { if (error > 36000) error -= 36000; if (error < 0) error += 36000; return error; } static int32_t wrap_180(int32_t error) { if (error > 18000) error -= 36000; if (error < -18000) error += 36000; return error; } /* //static int32_t get_altitude_above_home(void) { // This is the altitude above the home location // The GPS gives us altitude at Sea Level // if you slope soar, you should see a negative number sometimes // ------------------------------------------------------------- return current_loc.alt - home.alt; } */ // distance is returned in meters static int32_t get_distance(struct Location *loc1, struct Location *loc2) { float dlat = (float)(loc2->lat - loc1->lat); float dlong = ((float)(loc2->lng - loc1->lng)) * scaleLongDown; dlong = sqrt(sq(dlat) + sq(dlong)) * 1.113195; return dlong; } /* //static int32_t get_alt_distance(struct Location *loc1, struct Location *loc2) { return abs(loc1->alt - loc2->alt); } */ static int32_t get_bearing(struct Location *loc1, struct Location *loc2) { int32_t off_x = loc2->lng - loc1->lng; int32_t off_y = (loc2->lat - loc1->lat) * scaleLongUp; int32_t bearing = 9000 + atan2(-off_y, off_x) * 5729.57795; if (bearing < 0) bearing += 36000; return bearing; }