#include "AP_Mount_Servo.h" #if HAL_MOUNT_SERVO_ENABLED extern const AP_HAL::HAL& hal; // init - performs any required initialisation for this instance void AP_Mount_Servo::init() { if (_instance == 0) { _roll_idx = SRV_Channel::k_mount_roll; _tilt_idx = SRV_Channel::k_mount_tilt; _pan_idx = SRV_Channel::k_mount_pan; _open_idx = SRV_Channel::k_mount_open; } else { // this must be the 2nd mount _roll_idx = SRV_Channel::k_mount2_roll; _tilt_idx = SRV_Channel::k_mount2_tilt; _pan_idx = SRV_Channel::k_mount2_pan; _open_idx = SRV_Channel::k_mount2_open; } } // update mount position - should be called periodically void AP_Mount_Servo::update() { switch (get_mode()) { // move mount to a "retracted position" or to a position where a fourth servo can retract the entire mount into the fuselage case MAV_MOUNT_MODE_RETRACT: { _angle_bf_output_deg = _params.retract_angles.get(); // initialise _angle_rad to smooth transition if user changes to RC_TARGETTING _angle_rad.roll = radians(_angle_bf_output_deg.x); _angle_rad.pitch = radians(_angle_bf_output_deg.y); _angle_rad.yaw = radians(_angle_bf_output_deg.z); _angle_rad.yaw_is_ef = false; break; } // move mount to a neutral position, typically pointing forward case MAV_MOUNT_MODE_NEUTRAL: { _angle_bf_output_deg = _params.neutral_angles.get(); // initialise _angle_rad to smooth transition if user changes to RC_TARGETTING _angle_rad.roll = radians(_angle_bf_output_deg.x); _angle_rad.pitch = radians(_angle_bf_output_deg.y); _angle_rad.yaw = radians(_angle_bf_output_deg.z); _angle_rad.yaw_is_ef = false; break; } // point to the angles given by a mavlink message case MAV_MOUNT_MODE_MAVLINK_TARGETING: { switch (mavt_target.target_type) { case MountTargetType::ANGLE: _angle_rad = mavt_target.angle_rad; break; case MountTargetType::RATE: update_angle_target_from_rate(mavt_target.rate_rads, _angle_rad); break; } // update _angle_bf_output_deg based on angle target update_angle_outputs(_angle_rad); break; } // RC radio manual angle control, but with stabilization from the AHRS case MAV_MOUNT_MODE_RC_TARGETING: { // update targets using pilot's RC inputs MountTarget rc_target {}; if (get_rc_rate_target(rc_target)) { update_angle_target_from_rate(rc_target, _angle_rad); } else if (get_rc_angle_target(rc_target)) { _angle_rad = rc_target; } // update _angle_bf_output_deg based on angle target update_angle_outputs(_angle_rad); break; } // point mount to a GPS location case MAV_MOUNT_MODE_GPS_POINT: { if (get_angle_target_to_roi(_angle_rad)) { update_angle_outputs(_angle_rad); } break; } case MAV_MOUNT_MODE_HOME_LOCATION: { if (get_angle_target_to_home(_angle_rad)) { update_angle_outputs(_angle_rad); } break; } case MAV_MOUNT_MODE_SYSID_TARGET: { if (get_angle_target_to_sysid(_angle_rad)) { update_angle_outputs(_angle_rad); } break; } default: //do nothing break; } // move mount to a "retracted position" into the fuselage with a fourth servo const bool mount_open = (get_mode() == MAV_MOUNT_MODE_RETRACT) ? 0 : 1; move_servo(_open_idx, mount_open, 0, 1); // write the results to the servos move_servo(_roll_idx, _angle_bf_output_deg.x*10, _params.roll_angle_min*10, _params.roll_angle_max*10); move_servo(_tilt_idx, _angle_bf_output_deg.y*10, _params.pitch_angle_min*10, _params.pitch_angle_max*10); move_servo(_pan_idx, _angle_bf_output_deg.z*10, _params.yaw_angle_min*10, _params.yaw_angle_max*10); } // returns true if this mount can control its pan (required for multicopters) bool AP_Mount_Servo::has_pan_control() const { return SRV_Channels::function_assigned(_pan_idx) && yaw_range_valid(); } // get attitude as a quaternion. returns true on success bool AP_Mount_Servo::get_attitude_quaternion(Quaternion& att_quat) { att_quat.from_euler(radians(_angle_bf_output_deg.x), radians(_angle_bf_output_deg.y), radians(_angle_bf_output_deg.z)); return true; } // private methods // update body-frame angle outputs from earth-frame angle targets void AP_Mount_Servo::update_angle_outputs(const MountTarget& angle_rad) { const AP_AHRS &ahrs = AP::ahrs(); // get target yaw in body-frame with limits applied const float yaw_bf_rad = constrain_float(get_bf_yaw_angle(angle_rad), radians(_params.yaw_angle_min), radians(_params.yaw_angle_max)); // default output to target earth-frame roll and pitch angles, body-frame yaw _angle_bf_output_deg.x = degrees(angle_rad.roll); _angle_bf_output_deg.y = degrees(angle_rad.pitch); _angle_bf_output_deg.z = degrees(yaw_bf_rad); // this is sufficient for self-stabilising brushless gimbals if (!requires_stabilization) { return; } // retrieve lean angles from ahrs Vector2f ahrs_angle_rad = {ahrs.roll, ahrs.pitch}; // rotate ahrs roll and pitch angles to gimbal yaw if (has_pan_control()) { ahrs_angle_rad.rotate(-yaw_bf_rad); } // add roll and pitch lean angle correction _angle_bf_output_deg.x -= degrees(ahrs_angle_rad.x); _angle_bf_output_deg.y -= degrees(ahrs_angle_rad.y); // lead filter const Vector3f &gyro = ahrs.get_gyro(); if (!is_zero(_params.roll_stb_lead) && fabsf(ahrs.pitch) < M_PI/3.0f) { // Compute rate of change of euler roll angle float roll_rate = gyro.x + (ahrs.sin_pitch() / ahrs.cos_pitch()) * (gyro.y * ahrs.sin_roll() + gyro.z * ahrs.cos_roll()); _angle_bf_output_deg.x -= degrees(roll_rate) * _params.roll_stb_lead; } if (!is_zero(_params.pitch_stb_lead)) { // Compute rate of change of euler pitch angle float pitch_rate = ahrs.cos_pitch() * gyro.y - ahrs.sin_roll() * gyro.z; _angle_bf_output_deg.y -= degrees(pitch_rate) * _params.pitch_stb_lead; } } // move_servo - moves servo with the given id to the specified angle. all angles are in degrees * 10 void AP_Mount_Servo::move_servo(uint8_t function_idx, int16_t angle, int16_t angle_min, int16_t angle_max) { SRV_Channels::move_servo((SRV_Channel::Aux_servo_function_t)function_idx, angle, angle_min, angle_max); } #endif // HAL_MOUNT_SERVO_ENABLED