ardupilot/Blimp/mode_loiter.cpp

#include "Blimp.h"
/*
 * Init and run calls for loiter flight mode
 */


 bool ModeLoiter::init(bool ignore_checks){
    target_pos = blimp.pos_ned;
    target_yaw = blimp.ahrs.get_yaw();

    return true;
 }

//Runs the main loiter controller
void ModeLoiter::run()
{
    const float dt = blimp.scheduler.get_last_loop_time_s();
    
    Vector3f pilot;
    pilot.x = channel_front->get_control_in() / float(RC_SCALE) * g.max_pos_xy * dt;
    pilot.y = channel_right->get_control_in() / float(RC_SCALE) * g.max_pos_xy * dt;
    pilot.z = channel_down->get_control_in()  / float(RC_SCALE) * g.max_pos_z * dt;
    float pilot_yaw = channel_yaw->get_control_in()  / float(RC_SCALE) * g.max_pos_yaw * dt;

    if (g.simple_mode == 0){
        //If simple mode is disabled, input is in body-frame, thus needs to be rotated.
        blimp.rotate_BF_to_NE(pilot.xy());
    }
    target_pos.x += pilot.x;
    target_pos.y += pilot.y;
    target_pos.z += pilot.z;
    target_yaw = wrap_PI(target_yaw + pilot_yaw);

    //Pos controller's output becomes target for velocity controller
    Vector3f target_vel_ef{blimp.pid_pos_xy.update_all(target_pos, blimp.pos_ned, dt, {0,0,0}), 0};
    target_vel_ef.z = blimp.pid_pos_z.update_all(target_pos.z, blimp.pos_ned.z, dt);
    float yaw_ef = blimp.ahrs.get_yaw();
    float target_vel_yaw = blimp.pid_pos_yaw.update_error(wrap_PI(target_yaw - yaw_ef), dt);
    blimp.pid_pos_yaw.set_target_rate(target_yaw);
    blimp.pid_pos_yaw.set_actual_rate(yaw_ef);

    Vector3f target_vel_ef_c{constrain_float(target_vel_ef.x, -g.max_vel_xy, g.max_vel_xy),
                              constrain_float(target_vel_ef.y, -g.max_vel_xy, g.max_vel_xy),
                              constrain_float(target_vel_ef.z, -g.max_vel_z, g.max_vel_z)};
    float target_vel_yaw_c = constrain_float(target_vel_yaw, -g.max_vel_yaw, g.max_vel_yaw);

    Vector2f actuator = blimp.pid_vel_xy.update_all(target_vel_ef_c, blimp.vel_ned_filtd, dt, {0,0,0});
    float act_down = blimp.pid_vel_z.update_all(target_vel_ef_c.z, blimp.vel_ned_filtd.z, dt);
    blimp.rotate_NE_to_BF(actuator);
    float act_yaw = blimp.pid_vel_yaw.update_all(target_vel_yaw_c, blimp.vel_yaw_filtd, dt);

    if(!(blimp.g.dis_mask & (1<<(2-1)))){
        motors->front_out = actuator.x;
    }
    if(!(blimp.g.dis_mask & (1<<(1-1)))){
        motors->right_out = actuator.y;
    }
    if(!(blimp.g.dis_mask & (1<<(3-1)))){
        motors->down_out = act_down;
    }
    if(!(blimp.g.dis_mask & (1<<(4-1)))){
        motors->yaw_out  = act_yaw;
    }

    AP::logger().Write_PSCN(target_pos.x * 100.0, blimp.pos_ned.x * 100.0, 0.0, target_vel_ef_c.x * 100.0, blimp.vel_ned_filtd.x * 100.0, 0.0, 0.0, 0.0);
    AP::logger().Write_PSCE(target_pos.y * 100.0, blimp.pos_ned.y * 100.0, 0.0, target_vel_ef_c.y * 100.0, blimp.vel_ned_filtd.y * 100.0, 0.0, 0.0, 0.0);
    AP::logger().Write_PSCD(-target_pos.z * 100.0, -blimp.pos_ned.z * 100.0, 0.0, -target_vel_ef_c.z * 100.0, -blimp.vel_ned_filtd.z * 100.0, 0.0, 0.0, 0.0);
}