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ardupilot/libraries/AP_Mount/AP_Mount_Backend.cpp

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#include "AP_Mount_Backend.h"
#if HAL_MOUNT_ENABLED
#include <AP_AHRS/AP_AHRS.h>
#include <GCS_MAVLink/GCS.h>
#include <AP_Logger/AP_Logger.h>
#include <AP_Terrain/AP_Terrain.h>
extern const AP_HAL::HAL& hal;
#define AP_MOUNT_UPDATE_DT 0.02 // update rate in seconds. update() should be called at this rate
#define AP_MOUNT_POI_REQUEST_TIMEOUT_MS 30000 // POI calculations continue to be updated for this many seconds after last request
#define AP_MOUNT_POI_RESULT_TIMEOUT_MS 3000 // POI calculations valid for 3 seconds
#define AP_MOUNT_POI_DIST_M_MAX 10000 // POI calculations limit of 10,000m (10km)
// Default init function for every mount
void AP_Mount_Backend::init()
{
// setting default target sysid from parameters
_target_sysid = _params.sysid_default.get();
#if AP_MOUNT_POI_TO_LATLONALT_ENABLED
// create a calculation thread for poi.
if (!hal.scheduler->thread_create(FUNCTOR_BIND_MEMBER(&AP_Mount_Backend::calculate_poi, void),
"mount_calc_poi",
8192, AP_HAL::Scheduler::PRIORITY_IO, -1)) {
GCS_SEND_TEXT(MAV_SEVERITY_ERROR, "Mount: failed to start POI thread");
}
#endif
}
// set device id of this instance, for MNTx_DEVID parameter
void AP_Mount_Backend::set_dev_id(uint32_t id)
{
_params.dev_id.set_and_save(int32_t(id));
}
// return true if this mount accepts roll targets
bool AP_Mount_Backend::has_roll_control() const
{
return (_params.roll_angle_min < _params.roll_angle_max);
}
// return true if this mount accepts pitch targets
bool AP_Mount_Backend::has_pitch_control() const
{
return (_params.pitch_angle_min < _params.pitch_angle_max);
}
// set angle target in degrees
// yaw_is_earth_frame (aka yaw_lock) should be true if yaw angle is earth-frame, false if body-frame
void AP_Mount_Backend::set_angle_target(float roll_deg, float pitch_deg, float yaw_deg, bool yaw_is_earth_frame)
{
// enforce angle limits
roll_deg = constrain_float(roll_deg, _params.roll_angle_min, _params.roll_angle_max);
pitch_deg = constrain_float(pitch_deg, _params.pitch_angle_min, _params.pitch_angle_max);
if (!yaw_is_earth_frame) {
// only limit yaw if in body-frame. earth-frame yaw limiting is backend specific
// custom wrap code (instead of wrap_180) to better handle yaw of <= -180
if (yaw_deg > 180) {
yaw_deg -= 360;
}
yaw_deg = constrain_float(yaw_deg, _params.yaw_angle_min, _params.yaw_angle_max);
}
// set angle targets
mnt_target.target_type = MountTargetType::ANGLE;
mnt_target.angle_rad.roll = radians(roll_deg);
mnt_target.angle_rad.pitch = radians(pitch_deg);
mnt_target.angle_rad.yaw = radians(yaw_deg);
mnt_target.angle_rad.yaw_is_ef = yaw_is_earth_frame;
// set the mode to mavlink targeting
set_mode(MAV_MOUNT_MODE_MAVLINK_TARGETING);
}
// sets rate target in deg/s
// yaw_lock should be true if the yaw rate is earth-frame, false if body-frame (e.g. rotates with body of vehicle)
void AP_Mount_Backend::set_rate_target(float roll_degs, float pitch_degs, float yaw_degs, bool yaw_is_earth_frame)
{
// set rate targets
mnt_target.target_type = MountTargetType::RATE;
mnt_target.rate_rads.roll = radians(roll_degs);
mnt_target.rate_rads.pitch = radians(pitch_degs);
mnt_target.rate_rads.yaw = radians(yaw_degs);
mnt_target.rate_rads.yaw_is_ef = yaw_is_earth_frame;
// set the mode to mavlink targeting
set_mode(MAV_MOUNT_MODE_MAVLINK_TARGETING);
}
// set_roi_target - sets target location that mount should attempt to point towards
void AP_Mount_Backend::set_roi_target(const Location &target_loc)
{
// set the target gps location
_roi_target = target_loc;
_roi_target_set = true;
// set the mode to GPS tracking mode
set_mode(MAV_MOUNT_MODE_GPS_POINT);
}
// clear_roi_target - clears target location that mount should attempt to point towards
void AP_Mount_Backend::clear_roi_target()
{
// clear the target GPS location
_roi_target_set = false;
// reset the mode if in GPS tracking mode
if (_mode == MAV_MOUNT_MODE_GPS_POINT) {
MAV_MOUNT_MODE default_mode = (MAV_MOUNT_MODE)_params.default_mode.get();
set_mode(default_mode);
}
}
// set_sys_target - sets system that mount should attempt to point towards
void AP_Mount_Backend::set_target_sysid(uint8_t sysid)
{
_target_sysid = sysid;
// set the mode to sysid tracking mode
set_mode(MAV_MOUNT_MODE_SYSID_TARGET);
}
#if AP_MAVLINK_MSG_MOUNT_CONFIGURE_ENABLED
// process MOUNT_CONFIGURE messages received from GCS. deprecated.
void AP_Mount_Backend::handle_mount_configure(const mavlink_mount_configure_t &packet)
{
set_mode((MAV_MOUNT_MODE)packet.mount_mode);
}
#endif
#if HAL_GCS_ENABLED
// send a GIMBAL_DEVICE_ATTITUDE_STATUS message to GCS
void AP_Mount_Backend::send_gimbal_device_attitude_status(mavlink_channel_t chan)
{
if (suppress_heartbeat()) {
// block heartbeat from transmitting to the GCS
GCS_MAVLINK::disable_channel_routing(chan);
}
Quaternion att_quat;
if (!get_attitude_quaternion(att_quat)) {
return;
}
// construct quaternion array
const float quat_array[4] = {att_quat.q1, att_quat.q2, att_quat.q3, att_quat.q4};
mavlink_msg_gimbal_device_attitude_status_send(chan,
0, // target system
0, // target component
AP_HAL::millis(), // autopilot system time
get_gimbal_device_flags(),
quat_array, // attitude expressed as quaternion
std::numeric_limits<double>::quiet_NaN(), // roll axis angular velocity (NaN for unknown)
std::numeric_limits<double>::quiet_NaN(), // pitch axis angular velocity (NaN for unknown)
std::numeric_limits<double>::quiet_NaN(), // yaw axis angular velocity (NaN for unknown)
0, // failure flags (not supported)
std::numeric_limits<double>::quiet_NaN(), // delta_yaw (NaN for unknonw)
std::numeric_limits<double>::quiet_NaN(), // delta_yaw_velocity (NaN for unknonw)
_instance + 1); // gimbal_device_id
}
#endif
// return gimbal manager capability flags used by GIMBAL_MANAGER_INFORMATION message
uint32_t AP_Mount_Backend::get_gimbal_manager_capability_flags() const
{
uint32_t cap_flags = GIMBAL_MANAGER_CAP_FLAGS_HAS_RETRACT |
GIMBAL_MANAGER_CAP_FLAGS_HAS_NEUTRAL |
GIMBAL_MANAGER_CAP_FLAGS_HAS_RC_INPUTS |
GIMBAL_MANAGER_CAP_FLAGS_CAN_POINT_LOCATION_LOCAL |
GIMBAL_MANAGER_CAP_FLAGS_CAN_POINT_LOCATION_GLOBAL;
// roll control
if (has_roll_control()) {
cap_flags |= GIMBAL_MANAGER_CAP_FLAGS_HAS_ROLL_AXIS |
GIMBAL_MANAGER_CAP_FLAGS_HAS_ROLL_FOLLOW |
GIMBAL_MANAGER_CAP_FLAGS_HAS_ROLL_LOCK;
}
// pitch control
if (has_pitch_control()) {
cap_flags |= GIMBAL_MANAGER_CAP_FLAGS_HAS_PITCH_AXIS |
GIMBAL_MANAGER_CAP_FLAGS_HAS_PITCH_FOLLOW |
GIMBAL_MANAGER_CAP_FLAGS_HAS_PITCH_LOCK;
}
// yaw control
if (has_pan_control()) {
cap_flags |= GIMBAL_MANAGER_CAP_FLAGS_HAS_YAW_AXIS |
GIMBAL_MANAGER_CAP_FLAGS_HAS_YAW_FOLLOW |
GIMBAL_MANAGER_CAP_FLAGS_HAS_YAW_LOCK;
}
return cap_flags;
}
// send a GIMBAL_MANAGER_INFORMATION message to GCS
void AP_Mount_Backend::send_gimbal_manager_information(mavlink_channel_t chan)
{
mavlink_msg_gimbal_manager_information_send(chan,
AP_HAL::millis(), // autopilot system time
get_gimbal_manager_capability_flags(), // bitmap of gimbal manager capability flags
_instance + 1, // gimbal device id
radians(_params.roll_angle_min), // roll_min in radians
radians(_params.roll_angle_max), // roll_max in radians
radians(_params.pitch_angle_min), // pitch_min in radians
radians(_params.pitch_angle_max), // pitch_max in radians
radians(_params.yaw_angle_min), // yaw_min in radians
radians(_params.yaw_angle_max)); // yaw_max in radians
}
// send a GIMBAL_MANAGER_STATUS message to GCS
void AP_Mount_Backend::send_gimbal_manager_status(mavlink_channel_t chan)
{
uint32_t flags = GIMBAL_MANAGER_FLAGS_ROLL_LOCK | GIMBAL_MANAGER_FLAGS_PITCH_LOCK;
if (_yaw_lock) {
flags |= GIMBAL_MANAGER_FLAGS_YAW_LOCK;
}
mavlink_msg_gimbal_manager_status_send(chan,
AP_HAL::millis(), // autopilot system time
flags, // bitmap of gimbal manager flags
_instance + 1, // gimbal device id
mavlink_control_id.sysid, // primary control system id
mavlink_control_id.compid, // primary control component id
0, // secondary control system id
0); // secondary control component id
}
#if AP_MAVLINK_MSG_MOUNT_CONTROL_ENABLED
// process MOUNT_CONTROL messages received from GCS. deprecated.
void AP_Mount_Backend::handle_mount_control(const mavlink_mount_control_t &packet)
{
switch (get_mode()) {
case MAV_MOUNT_MODE_MAVLINK_TARGETING:
// input_a : Pitch in centi-degrees
// input_b : Roll in centi-degrees
// input_c : Yaw in centi-degrees (interpreted as body-frame)
set_angle_target(packet.input_b * 0.01, packet.input_a * 0.01, packet.input_c * 0.01, false);
break;
case MAV_MOUNT_MODE_GPS_POINT: {
// input_a : lat in degE7
// input_b : lon in degE7
// input_c : alt in cm (interpreted as above home)
const Location target_location {
packet.input_a,
packet.input_b,
packet.input_c,
Location::AltFrame::ABOVE_HOME
};
set_roi_target(target_location);
break;
}
case MAV_MOUNT_MODE_RETRACT:
case MAV_MOUNT_MODE_NEUTRAL:
case MAV_MOUNT_MODE_RC_TARGETING:
case MAV_MOUNT_MODE_SYSID_TARGET:
case MAV_MOUNT_MODE_HOME_LOCATION:
default:
// no effect in these modes
break;
}
}
#endif
// handle do_mount_control command. Returns MAV_RESULT_ACCEPTED on success
MAV_RESULT AP_Mount_Backend::handle_command_do_mount_control(const mavlink_command_int_t &packet)
{
const MAV_MOUNT_MODE new_mode = (MAV_MOUNT_MODE)packet.z;
// interpret message fields based on mode
switch (new_mode) {
case MAV_MOUNT_MODE_RETRACT:
case MAV_MOUNT_MODE_NEUTRAL:
case MAV_MOUNT_MODE_RC_TARGETING:
case MAV_MOUNT_MODE_HOME_LOCATION:
// simply set mode
set_mode(new_mode);
return MAV_RESULT_ACCEPTED;
case MAV_MOUNT_MODE_MAVLINK_TARGETING: {
// set body-frame target angles (in degrees) from mavlink message
const float pitch_deg = packet.param1; // param1: pitch (in degrees)
const float roll_deg = packet.param2; // param2: roll in degrees
const float yaw_deg = packet.param3; // param3: yaw in degrees
// warn if angles are invalid to catch angles sent in centi-degrees
if ((fabsf(pitch_deg) > 90) || (fabsf(roll_deg) > 180) || (fabsf(yaw_deg) > 360)) {
send_warning_to_GCS("invalid angle targets");
return MAV_RESULT_FAILED;
}
set_angle_target(packet.param2, packet.param1, packet.param3, false);
return MAV_RESULT_ACCEPTED;
}
case MAV_MOUNT_MODE_GPS_POINT: {
// set lat, lon, alt position targets from mavlink message
// warn if lat, lon appear to be in param1,2 instead of param x,y as this indicates
// sender is relying on a bug in AP-4.2's (and earlier) handling of MAV_CMD_DO_MOUNT_CONTROL
if (!is_zero(packet.param1) && !is_zero(packet.param2) && packet.x == 0 && packet.y == 0) {
send_warning_to_GCS("GPS_POINT target invalid");
return MAV_RESULT_FAILED;
}
// param4: altitude in meters
// x: latitude in degrees * 1E7
// y: longitude in degrees * 1E7
const Location target_location {
packet.x, // latitude in degrees * 1E7
packet.y, // longitude in degrees * 1E7
(int32_t)packet.param4 * 100, // alt converted from meters to cm
Location::AltFrame::ABOVE_HOME
};
set_roi_target(target_location);
return MAV_RESULT_ACCEPTED;
}
default:
// invalid mode
return MAV_RESULT_FAILED;
}
}
// handle do_gimbal_manager_configure. Returns MAV_RESULT_ACCEPTED on success
// requires original message in order to extract caller's sysid and compid
MAV_RESULT AP_Mount_Backend::handle_command_do_gimbal_manager_configure(const mavlink_command_int_t &packet, const mavlink_message_t &msg)
{
// sanity check param1 and param2 values
if ((packet.param1 < -3) || (packet.param1 > UINT8_MAX) || (packet.param2 < -3) || (packet.param2 > UINT8_MAX)) {
return MAV_RESULT_FAILED;
}
// convert negative packet1 and packet2 values
int16_t new_sysid = packet.param1;
switch (new_sysid) {
case -1:
// leave unchanged
break;
case -2:
// set itself in control
mavlink_control_id.sysid = msg.sysid;
mavlink_control_id.compid = msg.compid;
break;
case -3:
// remove control if currently in control
if ((mavlink_control_id.sysid == msg.sysid) && (mavlink_control_id.compid == msg.compid)) {
mavlink_control_id.sysid = 0;
mavlink_control_id.compid = 0;
}
break;
default:
mavlink_control_id.sysid = packet.param1;
mavlink_control_id.compid = packet.param2;
break;
}
return MAV_RESULT_ACCEPTED;
}
// handle a GLOBAL_POSITION_INT message
bool AP_Mount_Backend::handle_global_position_int(uint8_t msg_sysid, const mavlink_global_position_int_t &packet)
{
if (_target_sysid != msg_sysid) {
return false;
}
_target_sysid_location.lat = packet.lat;
_target_sysid_location.lng = packet.lon;
// global_position_int.alt is *UP*, so is location.
_target_sysid_location.set_alt_cm(packet.alt*0.1, Location::AltFrame::ABSOLUTE);
_target_sysid_location_set = true;
return true;
}
// write mount log packet
void AP_Mount_Backend::write_log(uint64_t timestamp_us)
{
// return immediately if no yaw estimate
float ahrs_yaw = AP::ahrs().yaw;
if (isnan(ahrs_yaw)) {
return;
}
const auto nanf = AP::logger().quiet_nanf();
// get_attitude_quaternion and convert to Euler angles
float roll = nanf;
float pitch = nanf;
float yaw_bf = nanf;
float yaw_ef = nanf;
if (_frontend.get_attitude_euler(_instance, roll, pitch, yaw_bf)) {
yaw_ef = wrap_180(yaw_bf + degrees(ahrs_yaw));
}
// get mount's target (desired) angles and convert yaw to earth frame
float target_roll = nanf;
float target_pitch = nanf;
float target_yaw = nanf;
bool target_yaw_is_ef = false;
IGNORE_RETURN(get_angle_target(target_roll, target_pitch, target_yaw, target_yaw_is_ef));
// get rangefinder distance
float rangefinder_dist = nanf;
IGNORE_RETURN(get_rangefinder_distance(rangefinder_dist));
const struct log_Mount pkt {
LOG_PACKET_HEADER_INIT(static_cast<uint8_t>(LOG_MOUNT_MSG)),
time_us : (timestamp_us > 0) ? timestamp_us : AP_HAL::micros64(),
instance : _instance,
desired_roll : target_roll,
actual_roll : roll,
desired_pitch : target_pitch,
actual_pitch : pitch,
desired_yaw_bf: target_yaw_is_ef ? nanf : target_yaw,
actual_yaw_bf : yaw_bf,
desired_yaw_ef: target_yaw_is_ef ? target_yaw : nanf,
actual_yaw_ef : yaw_ef,
rangefinder_dist : rangefinder_dist,
};
AP::logger().WriteCriticalBlock(&pkt, sizeof(pkt));
}
#if AP_MOUNT_POI_TO_LATLONALT_ENABLED
// get poi information. Returns true on success and fills in gimbal attitude, location and poi location
bool AP_Mount_Backend::get_poi(uint8_t instance, Quaternion &quat, Location &loc, Location &poi_loc)
{
WITH_SEMAPHORE(poi_calculation.sem);
// record time of request
const uint32_t now_ms = AP_HAL::millis();
poi_calculation.poi_request_ms = now_ms;
// check if poi calculated recently
if (now_ms - poi_calculation.poi_update_ms > AP_MOUNT_POI_RESULT_TIMEOUT_MS) {
return false;
}
// check attitude is valid
if (poi_calculation.att_quat.is_nan()) {
return false;
}
quat = poi_calculation.att_quat;
loc = poi_calculation.loc;
poi_loc = poi_calculation.poi_loc;
return true;
}
// calculate the Location that the gimbal is pointing at
void AP_Mount_Backend::calculate_poi()
{
while (true) {
// run this loop at 10hz
hal.scheduler->delay(100);
// calculate poi if requested within last 30 seconds
{
WITH_SEMAPHORE(poi_calculation.sem);
if ((poi_calculation.poi_request_ms == 0) ||
(AP_HAL::millis() - poi_calculation.poi_request_ms > AP_MOUNT_POI_REQUEST_TIMEOUT_MS)) {
continue;
}
}
// get the current location of vehicle
const AP_AHRS &ahrs = AP::ahrs();
Location curr_loc;
if (!ahrs.get_location(curr_loc)) {
continue;
}
// change vehicle alt to AMSL
curr_loc.change_alt_frame(Location::AltFrame::ABSOLUTE);
// project forward from vehicle looking for terrain
// start testing at vehicle's location
Location test_loc = curr_loc;
Location prev_test_loc = curr_loc;
// get terrain altitude (AMSL) at test_loc
auto terrain = AP_Terrain::get_singleton();
float terrain_amsl_m;
if ((terrain == nullptr) || !terrain->height_amsl(test_loc, terrain_amsl_m, true)) {
continue;
}
// retrieve gimbal attitude
Quaternion quat;
if (!get_attitude_quaternion(quat)) {
// gimbal attitude unavailable
continue;
}
// iteratively move test_loc forward until its alt-above-sea-level is below terrain-alt-above-sea-level
const float dist_increment_m = MAX(terrain->get_grid_spacing(), 10);
const float mount_pitch_deg = degrees(quat.get_euler_pitch());
const float mount_yaw_ef_deg = wrap_180(degrees(quat.get_euler_yaw()) + degrees(ahrs.get_yaw()));
float total_dist_m = 0;
bool get_terrain_alt_success = true;
float prev_terrain_amsl_m = terrain_amsl_m;
while (total_dist_m < AP_MOUNT_POI_DIST_M_MAX && (test_loc.alt * 0.01) > terrain_amsl_m) {
total_dist_m += dist_increment_m;
// backup previous test location and terrain amsl
prev_test_loc = test_loc;
prev_terrain_amsl_m = terrain_amsl_m;
// move test location forward
test_loc.offset_bearing_and_pitch(mount_yaw_ef_deg, mount_pitch_deg, dist_increment_m);
// get terrain's alt-above-sea-level (at test_loc)
// fail if terrain alt cannot be retrieved
if (!terrain->height_amsl(test_loc, terrain_amsl_m, true) || std::isnan(terrain_amsl_m)) {
get_terrain_alt_success = false;
continue;
}
}
// if a fail occurred above when getting terrain alt then restart calculations from the beginning
if (!get_terrain_alt_success) {
continue;
}
if (total_dist_m >= AP_MOUNT_POI_DIST_M_MAX) {
// unable to find terrain within dist_max
continue;
}
// test location has dropped below terrain
// interpolate along line between prev_test_loc and test_loc
float dist_interp_m = linear_interpolate(0, dist_increment_m, 0, prev_test_loc.alt * 0.01 - prev_terrain_amsl_m, test_loc.alt * 0.01 - terrain_amsl_m);
{
WITH_SEMAPHORE(poi_calculation.sem);
poi_calculation.poi_loc = prev_test_loc;
poi_calculation.poi_loc.offset_bearing_and_pitch(mount_yaw_ef_deg, mount_pitch_deg, dist_interp_m);
poi_calculation.att_quat = {quat[0], quat[1], quat[2], quat[3]};
poi_calculation.loc = curr_loc;
poi_calculation.poi_update_ms = AP_HAL::millis();
}
}
}
#endif
// get pilot input (in the range -1 to +1) received through RC
void AP_Mount_Backend::get_rc_input(float& roll_in, float& pitch_in, float& yaw_in) const
{
const RC_Channel *roll_ch = rc().find_channel_for_option(_instance == 0 ? RC_Channel::AUX_FUNC::MOUNT1_ROLL : RC_Channel::AUX_FUNC::MOUNT2_ROLL);
const RC_Channel *pitch_ch = rc().find_channel_for_option(_instance == 0 ? RC_Channel::AUX_FUNC::MOUNT1_PITCH : RC_Channel::AUX_FUNC::MOUNT2_PITCH);
const RC_Channel *yaw_ch = rc().find_channel_for_option(_instance == 0 ? RC_Channel::AUX_FUNC::MOUNT1_YAW : RC_Channel::AUX_FUNC::MOUNT2_YAW);
roll_in = 0;
if ((roll_ch != nullptr) && (roll_ch->get_radio_in() > 0)) {
roll_in = roll_ch->norm_input_dz();
}
pitch_in = 0;
if ((pitch_ch != nullptr) && (pitch_ch->get_radio_in() > 0)) {
pitch_in = pitch_ch->norm_input_dz();
}
yaw_in = 0;
if ((yaw_ch != nullptr) && (yaw_ch->get_radio_in() > 0)) {
yaw_in = yaw_ch->norm_input_dz();
}
}
// get angle or rate targets from pilot RC
// target_type will be either ANGLE or RATE, rpy will be the target angle in deg or rate in deg/s
void AP_Mount_Backend::get_rc_target(MountTargetType& target_type, MountTarget& target_rpy) const
{
// get RC input from pilot
float roll_in, pitch_in, yaw_in;
get_rc_input(roll_in, pitch_in, yaw_in);
// yaw frame
target_rpy.yaw_is_ef = _yaw_lock;
// if RC_RATE is zero, targets are angle
if (_params.rc_rate_max <= 0) {
target_type = MountTargetType::ANGLE;
// roll angle
target_rpy.roll = radians(((roll_in + 1.0f) * 0.5f * (_params.roll_angle_max - _params.roll_angle_min) + _params.roll_angle_min));
// pitch angle
target_rpy.pitch = radians(((pitch_in + 1.0f) * 0.5f * (_params.pitch_angle_max - _params.pitch_angle_min) + _params.pitch_angle_min));
// yaw angle
if (target_rpy.yaw_is_ef) {
// if yaw is earth-frame pilot yaw input control angle from -180 to +180 deg
target_rpy.yaw = yaw_in * M_PI;
} else {
// yaw target in body frame so apply body frame limits
target_rpy.yaw = radians(((yaw_in + 1.0f) * 0.5f * (_params.yaw_angle_max - _params.yaw_angle_min) + _params.yaw_angle_min));
}
return;
}
// calculate rate targets
target_type = MountTargetType::RATE;
const float rc_rate_max_rads = radians(_params.rc_rate_max.get());
target_rpy.roll = roll_in * rc_rate_max_rads;
target_rpy.pitch = pitch_in * rc_rate_max_rads;
target_rpy.yaw = yaw_in * rc_rate_max_rads;
}
// get angle targets (in radians) to a Location
// returns true on success, false on failure
bool AP_Mount_Backend::get_angle_target_to_location(const Location &loc, MountTarget& angle_rad) const
{
// exit immediately if vehicle's location is unavailable
Location current_loc;
if (!AP::ahrs().get_location(current_loc)) {
return false;
}
// exit immediate if location is invalid
if (!loc.initialised()) {
return false;
}
const float GPS_vector_x = Location::diff_longitude(loc.lng, current_loc.lng)*cosf(ToRad((current_loc.lat + loc.lat) * 0.00000005f)) * 0.01113195f;
const float GPS_vector_y = (loc.lat - current_loc.lat) * 0.01113195f;
int32_t target_alt_cm = 0;
if (!loc.get_alt_cm(Location::AltFrame::ABOVE_HOME, target_alt_cm)) {
return false;
}
int32_t current_alt_cm = 0;
if (!current_loc.get_alt_cm(Location::AltFrame::ABOVE_HOME, current_alt_cm)) {
return false;
}
float GPS_vector_z = target_alt_cm - current_alt_cm;
float target_distance = 100.0f*norm(GPS_vector_x, GPS_vector_y); // Careful , centimeters here locally. Baro/alt is in cm, lat/lon is in meters.
// calculate roll, pitch, yaw angles
angle_rad.roll = 0;
angle_rad.pitch = atan2f(GPS_vector_z, target_distance);
angle_rad.yaw = atan2f(GPS_vector_x, GPS_vector_y);
angle_rad.yaw_is_ef = true;
return true;
}
// get angle targets (in radians) to ROI location
// returns true on success, false on failure
bool AP_Mount_Backend::get_angle_target_to_roi(MountTarget& angle_rad) const
{
if (!_roi_target_set) {
return false;
}
return get_angle_target_to_location(_roi_target, angle_rad);
}
// return body-frame yaw angle from a mount target
float AP_Mount_Backend::MountTarget::get_bf_yaw() const
{
if (yaw_is_ef) {
// convert to body-frame
return wrap_PI(yaw - AP::ahrs().yaw);
}
// target is already body-frame
return yaw;
}
// return earth-frame yaw angle from a mount target
float AP_Mount_Backend::MountTarget::get_ef_yaw() const
{
if (yaw_is_ef) {
// target is already earth-frame
return yaw;
}
// convert to earth-frame
return wrap_PI(yaw + AP::ahrs().yaw);
}
// sets roll, pitch, yaw and yaw_is_ef
void AP_Mount_Backend::MountTarget::set(const Vector3f& rpy, bool yaw_is_ef_in)
{
roll = rpy.x;
pitch = rpy.y;
yaw = rpy.z;
yaw_is_ef = yaw_is_ef_in;
}
// update angle targets using a given rate target
// the resulting angle_rad yaw frame will match the rate_rad yaw frame
// assumes a 50hz update rate
void AP_Mount_Backend::update_angle_target_from_rate(const MountTarget& rate_rad, MountTarget& angle_rad) const
{
// update roll and pitch angles and apply limits
angle_rad.roll = constrain_float(angle_rad.roll + rate_rad.roll * AP_MOUNT_UPDATE_DT, radians(_params.roll_angle_min), radians(_params.roll_angle_max));
angle_rad.pitch = constrain_float(angle_rad.pitch + rate_rad.pitch * AP_MOUNT_UPDATE_DT, radians(_params.pitch_angle_min), radians(_params.pitch_angle_max));
// ensure angle yaw frames matches rate yaw frame
if (angle_rad.yaw_is_ef != rate_rad.yaw_is_ef) {
if (rate_rad.yaw_is_ef) {
angle_rad.yaw = angle_rad.get_ef_yaw();
} else {
angle_rad.yaw = angle_rad.get_bf_yaw();
}
angle_rad.yaw_is_ef = rate_rad.yaw_is_ef;
}
// update yaw angle target
angle_rad.yaw = angle_rad.yaw + rate_rad.yaw * AP_MOUNT_UPDATE_DT;
if (angle_rad.yaw_is_ef) {
// if earth-frame yaw wraps between += 180 degrees
angle_rad.yaw = wrap_PI(angle_rad.yaw);
} else {
// if body-frame constrain yaw to body-frame limits
angle_rad.yaw = constrain_float(angle_rad.yaw, radians(_params.yaw_angle_min), radians(_params.yaw_angle_max));
}
}
// helper function to provide GIMBAL_DEVICE_FLAGS for use in GIMBAL_DEVICE_ATTITUDE_STATUS message
uint16_t AP_Mount_Backend::get_gimbal_device_flags() const
{
const uint16_t flags = (get_mode() == MAV_MOUNT_MODE_RETRACT ? GIMBAL_DEVICE_FLAGS_RETRACT : 0) |
(get_mode() == MAV_MOUNT_MODE_NEUTRAL ? GIMBAL_DEVICE_FLAGS_NEUTRAL : 0) |
GIMBAL_DEVICE_FLAGS_ROLL_LOCK | // roll angle is always earth-frame
GIMBAL_DEVICE_FLAGS_PITCH_LOCK; // pitch angle is always earth-frame, yaw_angle is always body-frame
return flags;
}
// get angle targets (in radians) to home location
// returns true on success, false on failure
bool AP_Mount_Backend::get_angle_target_to_home(MountTarget& angle_rad) const
{
// exit immediately if home is not set
if (!AP::ahrs().home_is_set()) {
return false;
}
return get_angle_target_to_location(AP::ahrs().get_home(), angle_rad);
}
// get angle targets (in radians) to a vehicle with sysid of _target_sysid
// returns true on success, false on failure
bool AP_Mount_Backend::get_angle_target_to_sysid(MountTarget& angle_rad) const
{
// exit immediately if sysid is not set or no location available
if (!_target_sysid_location_set) {
return false;
}
if (!_target_sysid) {
return false;
}
return get_angle_target_to_location(_target_sysid_location, angle_rad);
}
// get target rate in deg/sec. returns true on success
bool AP_Mount_Backend::get_rate_target(float& roll_degs, float& pitch_degs, float& yaw_degs, bool& yaw_is_earth_frame)
{
if (mnt_target.target_type == MountTargetType::RATE) {
roll_degs = degrees(mnt_target.rate_rads.roll);
pitch_degs = degrees(mnt_target.rate_rads.pitch);
yaw_degs = degrees(mnt_target.rate_rads.yaw);
yaw_is_earth_frame = mnt_target.rate_rads.yaw_is_ef;
return true;
}
return false;
}
// get target angle in deg. returns true on success
bool AP_Mount_Backend::get_angle_target(float& roll_deg, float& pitch_deg, float& yaw_deg, bool& yaw_is_earth_frame)
{
if (mnt_target.target_type == MountTargetType::ANGLE) {
roll_deg = degrees(mnt_target.angle_rad.roll);
pitch_deg = degrees(mnt_target.angle_rad.pitch);
yaw_deg = degrees(mnt_target.angle_rad.yaw);
yaw_is_earth_frame = mnt_target.angle_rad.yaw_is_ef;
return true;
}
return false;
}
// sent warning to GCS. Warnings are throttled to at most once every 30 seconds
void AP_Mount_Backend::send_warning_to_GCS(const char* warning_str)
{
uint32_t now_ms = AP_HAL::millis();
if (now_ms - _last_warning_ms < 30000) {
return;
}
GCS_SEND_TEXT(MAV_SEVERITY_WARNING, "Mount: %s", warning_str);
_last_warning_ms = now_ms;
}
#endif // HAL_MOUNT_ENABLED
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