ardupilot/ArduCopter/commands_logic.pde

/// -*- tab-width: 4; Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*-

/********************************************************************************/
// Command Event Handlers
/********************************************************************************/
// process_nav_command - main switch statement to initiate the next nav command in the command_nav_queue
static void process_nav_command()
{
    switch(command_nav_queue.id) {

    case MAV_CMD_NAV_TAKEOFF:                   // 22
        do_takeoff();
        break;

    case MAV_CMD_NAV_WAYPOINT:                  // 16  Navigate to Waypoint
        do_nav_wp();
        break;

    case MAV_CMD_NAV_LAND:              // 21 LAND to Waypoint
        do_land(&command_nav_queue);
        break;

    case MAV_CMD_NAV_LOITER_UNLIM:              // 17 Loiter indefinitely
        do_loiter_unlimited();
        break;

    case MAV_CMD_NAV_LOITER_TURNS:              //18 Loiter N Times
        do_circle();
        break;

    case MAV_CMD_NAV_LOITER_TIME:              // 19
        do_loiter_time();
        break;

    case MAV_CMD_NAV_RETURN_TO_LAUNCH:             //20
        do_RTL();
        break;

    default:
        break;
    }

}

// process_cond_command - main switch statement to initiate the next conditional command in the command_cond_queue
static void process_cond_command()
{
    switch(command_cond_queue.id) {

    case MAV_CMD_CONDITION_DELAY:             // 112
        do_wait_delay();
        break;

    case MAV_CMD_CONDITION_DISTANCE:             // 114
        do_within_distance();
        break;

    case MAV_CMD_CONDITION_CHANGE_ALT:             // 113
        do_change_alt();
        break;

    case MAV_CMD_CONDITION_YAW:             // 115
        do_yaw();
        break;

    default:
        break;
    }
}

// process_now_command - main switch statement to initiate the next now command in the command_cond_queue
// now commands are conditional commands that are executed immediately so they do not require a corresponding verify to be run later
static void process_now_command()
{
    switch(command_cond_queue.id) {

    case MAV_CMD_DO_JUMP:              // 177
        do_jump();
        break;

    case MAV_CMD_DO_CHANGE_SPEED:             // 178
        do_change_speed();
        break;

    case MAV_CMD_DO_SET_HOME:             // 179
        do_set_home();
        break;

    case MAV_CMD_DO_SET_SERVO:
        ServoRelayEvents.do_set_servo(command_cond_queue.p1, command_cond_queue.alt);
        break;
        
    case MAV_CMD_DO_SET_RELAY:
        ServoRelayEvents.do_set_relay(command_cond_queue.p1, command_cond_queue.alt);
        break;
        
    case MAV_CMD_DO_REPEAT_SERVO:
        ServoRelayEvents.do_repeat_servo(command_cond_queue.p1, command_cond_queue.alt,
                                         command_cond_queue.lat, command_cond_queue.lng);
        break;
        
    case MAV_CMD_DO_REPEAT_RELAY:
        ServoRelayEvents.do_repeat_relay(command_cond_queue.p1, command_cond_queue.alt,
                                         command_cond_queue.lat);
        break;

    case MAV_CMD_DO_SET_ROI:                // 201
        // point the copter and camera at a region of interest (ROI)
        do_roi();
        break;

#if CAMERA == ENABLED
    case MAV_CMD_DO_CONTROL_VIDEO:                      // Control on-board camera capturing. |Camera ID (-1 for all)| Transmission: 0: disabled, 1: enabled compressed, 2: enabled raw| Transmission mode: 0: video stream, >0: single images every n seconds (decimal)| Recording: 0: disabled, 1: enabled compressed, 2: enabled raw| Empty| Empty| Empty|
        break;

    case MAV_CMD_DO_DIGICAM_CONFIGURE:                  // Mission command to configure an on-board camera controller system. |Modes: P, TV, AV, M, Etc| Shutter speed: Divisor number for one second| Aperture: F stop number| ISO number e.g. 80, 100, 200, Etc| Exposure type enumerator| Command Identity| Main engine cut-off time before camera trigger in seconds/10 (0 means no cut-off)|
        break;

    case MAV_CMD_DO_DIGICAM_CONTROL:                    // Mission command to control an on-board camera controller system. |Session control e.g. show/hide lens| Zoom's absolute position| Zooming step value to offset zoom from the current position| Focus Locking, Unlocking or Re-locking| Shooting Command| Command Identity| Empty|
        do_take_picture();
        break;

    case MAV_CMD_DO_SET_CAM_TRIGG_DIST:
        camera.set_trigger_distance(command_cond_queue.alt);
        break;
#endif

#if MOUNT == ENABLED
    case MAV_CMD_DO_MOUNT_CONFIGURE:                    // Mission command to configure a camera mount |Mount operation mode (see MAV_CONFIGURE_MOUNT_MODE enum)| stabilize roll? (1 = yes, 0 = no)| stabilize pitch? (1 = yes, 0 = no)| stabilize yaw? (1 = yes, 0 = no)| Empty| Empty| Empty|
        camera_mount.configure_cmd();
        break;

    case MAV_CMD_DO_MOUNT_CONTROL:                      // Mission command to control a camera mount |pitch(deg*100) or lat, depending on mount mode.| roll(deg*100) or lon depending on mount mode| yaw(deg*100) or alt (in cm) depending on mount mode| Empty| Empty| Empty| Empty|
        camera_mount.control_cmd();
        break;
#endif

    default:
        // do nothing with unrecognized MAVLink messages
        break;
    }
}

/********************************************************************************/
// Verify command Handlers
/********************************************************************************/

// verify_nav_command - switch statement to ensure the active navigation command is progressing
// returns true once the active navigation command completes successfully
static bool verify_nav_command()
{
    switch(command_nav_queue.id) {

    case MAV_CMD_NAV_TAKEOFF:
        return verify_takeoff();
        break;

    case MAV_CMD_NAV_WAYPOINT:
        return verify_nav_wp();
        break;

    case MAV_CMD_NAV_LAND:
        return verify_land();
        break;

    case MAV_CMD_NAV_LOITER_UNLIM:
        return verify_loiter_unlimited();
        break;

    case MAV_CMD_NAV_LOITER_TURNS:
        return verify_circle();
        break;

    case MAV_CMD_NAV_LOITER_TIME:
        return verify_loiter_time();
        break;

    case MAV_CMD_NAV_RETURN_TO_LAUNCH:
        return verify_RTL();
        break;

    default:
        return false;
        break;
    }
}

// verify_cond_command - switch statement to ensure the active conditional command is progressing
// returns true once the active conditional command completes successfully
static bool verify_cond_command()
{
    switch(command_cond_queue.id) {

    case MAV_CMD_CONDITION_DELAY:
        return verify_wait_delay();
        break;

    case MAV_CMD_CONDITION_DISTANCE:
        return verify_within_distance();
        break;

    case MAV_CMD_CONDITION_CHANGE_ALT:
        return verify_change_alt();
        break;

    case MAV_CMD_CONDITION_YAW:
        return verify_yaw();
        break;

    default:
        return false;
        break;
    }
}

/********************************************************************************/
//
/********************************************************************************/

// do_RTL - start Return-to-Launch
static void do_RTL(void)
{
    // start rtl in auto flight mode
    auto_rtl_start();
}

/********************************************************************************/
//	Nav (Must) commands
/********************************************************************************/

// do_takeoff - initiate takeoff navigation command
static void do_takeoff()
{
    // Set wp navigation target to safe altitude above current position
    float takeoff_alt = command_nav_queue.alt;
    takeoff_alt = max(takeoff_alt,current_loc.alt);
    takeoff_alt = max(takeoff_alt,100.0f);
    auto_takeoff_start(takeoff_alt);
}

// do_nav_wp - initiate move to next waypoint
static void do_nav_wp()
{
    // Set wp navigation target
    auto_wp_start(pv_location_to_vector(command_nav_queue));

    // initialise original_wp_bearing which is used to check if we have missed the waypoint
    wp_bearing = wp_nav.get_wp_bearing_to_destination();
    original_wp_bearing = wp_bearing;

    // this will be used to remember the time in millis after we reach or pass the WP.
    loiter_time     = 0;
    // this is the delay, stored in seconds and expanded to millis
    loiter_time_max = command_nav_queue.p1;
    // if no delay set the waypoint as "fast"
    if (loiter_time_max == 0 ) {
        wp_nav.set_fast_waypoint(true);
    }
}

// do_land - initiate landing procedure
static void do_land(const struct Location *cmd)
{
    // To-Do: check if we have already landed

    // if location provided we fly to that location at current altitude
    if (cmd != NULL && (cmd->lat != 0 || cmd->lng != 0)) {
        // set state to fly to location
        land_state = LAND_STATE_FLY_TO_LOCATION;

        // calculate and set desired location above landing target
        Vector3f pos = pv_location_to_vector(*cmd);
        pos.z = min(current_loc.alt, RTL_ALT_MAX);
        auto_wp_start(pos);

        // initialise original_wp_bearing which is used to check if we have missed the waypoint
        wp_bearing = wp_nav.get_wp_bearing_to_destination();
        original_wp_bearing = wp_bearing;
    }else{
        // set landing state
        land_state = LAND_STATE_DESCENDING;

        // initialise landing controller
        auto_land_start();
    }
}

// do_loiter_unlimited - start loitering with no end conditions
// note: caller should set yaw_mode
static void do_loiter_unlimited()
{
    Vector3f target_pos;

    // get current position
    Vector3f curr_pos = inertial_nav.get_position();

    // default to use position provided
    target_pos = pv_location_to_vector(command_nav_queue);

    // use current location if not provided
    if(command_nav_queue.lat == 0 && command_nav_queue.lng == 0) {
        wp_nav.get_wp_stopping_point_xy(target_pos);
    }

    // use current altitude if not provided
    // To-Do: use z-axis stopping point instead of current alt
    if( command_nav_queue.alt == 0 ) {
        target_pos.z = curr_pos.z;
    }

    // start way point navigator and provide it the desired location
    auto_wp_start(target_pos);
}

// do_circle - initiate moving in a circle
static void do_circle()
{
    Vector3f curr_pos = inertial_nav.get_position();
    Vector3f circle_center = pv_location_to_vector(command_nav_queue);

    // set target altitude if not provided
    if (circle_center.z == 0) {
        circle_center.z = curr_pos.z;
    }

    // set lat/lon position if not provided
    // To-Do: use stopping point instead of current location
    if (command_nav_queue.lat == 0 && command_nav_queue.lng == 0) {
        circle_center.x = curr_pos.x;
        circle_center.y = curr_pos.y;
    }

    // start auto_circle
    auto_circle_start(circle_center);

    // record number of desired rotations from mission command
    circle_desired_rotations = command_nav_queue.p1;
}

// do_loiter_time - initiate loitering at a point for a given time period
// note: caller should set yaw_mode
static void do_loiter_time()
{
    Vector3f target_pos;

    // get current position
    Vector3f curr_pos = inertial_nav.get_position();

    // default to use position provided
    target_pos = pv_location_to_vector(command_nav_queue);

    // use current location if not provided
    if(command_nav_queue.lat == 0 && command_nav_queue.lng == 0) {
        wp_nav.get_wp_stopping_point_xy(target_pos);
    }

    // use current altitude if not provided
    if( command_nav_queue.alt == 0 ) {
        target_pos.z = curr_pos.z;
    }

    // start way point navigator and provide it the desired location
    auto_wp_start(target_pos);

    // setup loiter timer
    loiter_time     = 0;
    loiter_time_max = command_nav_queue.p1;     // units are (seconds)
}

/********************************************************************************/
//	Verify Nav (Must) commands
/********************************************************************************/

// verify_takeoff - check if we have completed the takeoff
static bool verify_takeoff()
{
    // have we reached our target altitude?
    return wp_nav.reached_wp_destination();
}

// verify_land - returns true if landing has been completed
static bool verify_land()
{
    bool retval = false;

    switch( land_state ) {
        case LAND_STATE_FLY_TO_LOCATION:
            // check if we've reached the location
            if (wp_nav.reached_wp_destination()) {
                // get destination so we can use it for loiter target
                Vector3f dest = wp_nav.get_wp_destination();

                // initialise landing controller
                auto_land_start(dest);

                // advance to next state
                land_state = LAND_STATE_DESCENDING;
            }
            break;

        case LAND_STATE_DESCENDING:
            // rely on THROTTLE_LAND mode to correctly update landing status
            retval = ap.land_complete;
            break;

        default:
            // this should never happen
            // TO-DO: log an error
            retval = true;
            break;
    }

    // true is returned if we've successfully landed
    return retval;
}

// verify_nav_wp - check if we have reached the next way point
static bool verify_nav_wp()
{
    // check if we have reached the waypoint
    if( !wp_nav.reached_wp_destination() ) {
        return false;
    }

    // start timer if necessary
    if(loiter_time == 0) {
        loiter_time = millis();
    }

    // check if timer has run out
    if (((millis() - loiter_time) / 1000) >= loiter_time_max) {
        gcs_send_text_fmt(PSTR("Reached Command #%i"),command_nav_index);
        return true;
    }else{
        return false;
    }
}

static bool verify_loiter_unlimited()
{
    return false;
}

// verify_loiter_time - check if we have loitered long enough
static bool verify_loiter_time()
{
    // return immediately if we haven't reached our destination
    if (!wp_nav.reached_wp_destination()) {
        return false;
    }

    // start our loiter timer
    if( loiter_time == 0 ) {
        loiter_time = millis();
    }

    // check if loiter timer has run out
    return (((millis() - loiter_time) / 1000) >= loiter_time_max);
}

// verify_circle - check if we have circled the point enough
static bool verify_circle()
{
    // have we rotated around the center enough times?
    return fabsf(circle_nav.get_angle_total()/(2*M_PI)) >= circle_desired_rotations;
}

// externs to remove compiler warning
extern bool rtl_state_complete;

// verify_RTL - handles any state changes required to implement RTL
// do_RTL should have been called once first to initialise all variables
// returns true with RTL has completed successfully
static bool verify_RTL()
{
    return (rtl_state_complete && (rtl_state == FinalDescent || rtl_state == Land));
}

/********************************************************************************/
//	Condition (May) commands
/********************************************************************************/

static void do_wait_delay()
{
    //cliSerial->print("dwd ");
    condition_start = millis();
    condition_value = command_cond_queue.lat * 1000;     // convert to milliseconds
    //cliSerial->println(condition_value,DEC);
}

static void do_change_alt()
{
    // adjust target appropriately for each nav mode
    if (control_mode == AUTO) {
        switch (auto_mode) {
        case Auto_TakeOff:
            // To-Do: adjust waypoint target altitude to new provided altitude
            break;
        case Auto_WP:
            // To-Do; reset origin to current location + stopping distance at new altitude
            break;
        case Auto_Land:
        case Auto_RTL:
            // ignore altitude
            break;
        case Auto_Circle:
            // move circle altitude up to target (we will need to store this target in circle class)
            break;
        }
    }
    // To-Do: store desired altitude in a variable so that it can be verified later
}

static void do_within_distance()
{
    condition_value  = command_cond_queue.lat * 100;
}

static void do_yaw()
{
    // get current yaw target
    int32_t curr_yaw_target = attitude_control.angle_ef_targets().z;

    // get final angle, 1 = Relative, 0 = Absolute
    if( command_cond_queue.lng == 0 ) {
        // absolute angle
        yaw_look_at_heading = wrap_360_cd(command_cond_queue.alt * 100);
    }else{
        // relative angle
        yaw_look_at_heading = wrap_360_cd(curr_yaw_target + command_cond_queue.alt * 100);
    }

    // get turn speed
    if( command_cond_queue.lat == 0 ) {
        // default to regular auto slew rate
        yaw_look_at_heading_slew = AUTO_YAW_SLEW_RATE;
    }else{
        int32_t turn_rate = (wrap_180_cd(yaw_look_at_heading - curr_yaw_target) / 100) / command_cond_queue.lat;
        yaw_look_at_heading_slew = constrain_int32(turn_rate, 1, 360);    // deg / sec
    }

    // set yaw mode
    set_auto_yaw_mode(AUTO_YAW_LOOK_AT_HEADING);

    // TO-DO: restore support for clockwise / counter clockwise rotation held in command_cond_queue.p1
    // command_cond_queue.p1; // 0 = undefined, 1 = clockwise, -1 = counterclockwise
}


/********************************************************************************/
// Verify Condition (May) commands
/********************************************************************************/

static bool verify_wait_delay()
{
    //cliSerial->print("vwd");
    if (millis() - condition_start > (uint32_t)max(condition_value,0)) {
        //cliSerial->println("y");
        condition_value = 0;
        return true;
    }
    //cliSerial->println("n");
    return false;
}

static bool verify_change_alt()
{
    // To-Do: use recorded target altitude to verify we have reached the target
    return true;
}

static bool verify_within_distance()
{
    if (wp_distance < max(condition_value,0)) {
        condition_value = 0;
        return true;
    }
    return false;
}

// verify_yaw - return true if we have reached the desired heading
static bool verify_yaw()
{
    if( labs(wrap_180_cd(ahrs.yaw_sensor-yaw_look_at_heading)) <= 200 ) {
        return true;
    }else{
        return false;
    }
}

/********************************************************************************/
//	Do (Now) commands
/********************************************************************************/

// do_guided - start guided mode
// this is not actually a mission command but rather a 
static void do_guided(const struct Location *cmd)
{
    // switch to guided mode if we're not already in guided mode
    if (control_mode != GUIDED) {
        if (!set_mode(GUIDED)) {
            // if we failed to enter guided mode return immediately
            return;
        }
    }

    // set wp_nav's destination
    Vector3f pos = pv_location_to_vector(*cmd);
    guided_set_destination(pos);
}

static void do_change_speed()
{
    wp_nav.set_horizontal_velocity(command_cond_queue.p1 * 100);
}

static void do_jump()
{
    // Used to track the state of the jump command in Mission scripting
    // -10 is a value that means the register is unused
    // when in use, it contains the current remaining jumps
    static int8_t jump = -10;                                                                   // used to track loops in jump command

    if(jump == -10) {
        // we use a locally stored index for jump
        jump = command_cond_queue.lat;
    }

    if(jump > 0) {
        jump--;
        change_command(command_cond_queue.p1);

    } else if (jump == 0) {
        // we're done, move along
        jump = -11;

    } else if (jump == -1) {
        // repeat forever
        change_command(command_cond_queue.p1);
    }
}

static void do_set_home()
{
    if(command_cond_queue.p1 == 1) {
        init_home();
    } else {
        home.id         = MAV_CMD_NAV_WAYPOINT;
        home.lng        = command_cond_queue.lng;                                       // Lon * 10**7
        home.lat        = command_cond_queue.lat;                                       // Lat * 10**7
        home.alt        = 0;
        //home_is_set 	= true;
        set_home_is_set(true);
    }
}

// do_roi - starts actions required by MAV_CMD_NAV_ROI
//          this involves either moving the camera to point at the ROI (region of interest)
//          and possibly rotating the copter to point at the ROI if our mount type does not support a yaw feature
//          Note: the ROI should already be in the command_nav_queue global variable
//	TO-DO: add support for other features of MAV_CMD_DO_SET_ROI including pointing at a given waypoint
static void do_roi()
{
#if MOUNT == ENABLED
    // check if mount type requires us to rotate the quad
    if( camera_mount.get_mount_type() != AP_Mount::k_pan_tilt && camera_mount.get_mount_type() != AP_Mount::k_pan_tilt_roll ) {
        yaw_look_at_WP = pv_location_to_vector(command_cond_queue);
        set_auto_yaw_mode(AUTO_YAW_LOOK_AT_LOCATION);
    }
    // send the command to the camera mount
    camera_mount.set_roi_cmd(&command_cond_queue);
    
    // TO-DO: expand handling of the do_nav_roi to support all modes of the MAVLink.  Currently we only handle mode 4 (see below)
    //		0: do nothing
    //		1: point at next waypoint
    //		2: point at a waypoint taken from WP# parameter (2nd parameter?)
    //		3: point at a location given by alt, lon, lat parameters
    //		4: point at a target given a target id (can't be implemented)
#else
    // if we have no camera mount aim the quad at the location
    yaw_look_at_WP = pv_location_to_vector(command_cond_queue);
    set_auto_yaw_mode(AUTO_YAW_LOOK_AT_LOCATION);
#endif
}

// do_take_picture - take a picture with the camera library
static void do_take_picture()
{
#if CAMERA == ENABLED
    camera.trigger_pic();
    if (g.log_bitmask & MASK_LOG_CAMERA) {
        Log_Write_Camera();
    }
#endif
}