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author | Thomas Gubler <thomasgubler@gmail.com> | 2014-03-03 22:09:01 +0100 |
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committer | Thomas Gubler <thomasgubler@gmail.com> | 2014-03-03 22:09:01 +0100 |
commit | 5707118a976e63a810203b3e9ad6e74837ab7f30 (patch) | |
tree | 2601a2cdb47de6bb28a9ed2de707b8581968f224 | |
parent | b76e26c5e5f37c4fb086a68e0427d9d297e8d225 (diff) | |
download | px4-firmware-5707118a976e63a810203b3e9ad6e74837ab7f30.tar.gz px4-firmware-5707118a976e63a810203b3e9ad6e74837ab7f30.tar.bz2 px4-firmware-5707118a976e63a810203b3e9ad6e74837ab7f30.zip |
add simple trim parameter for fw attitude
-rw-r--r-- | src/modules/fw_att_control/fw_att_control_main.cpp | 35 |
1 files changed, 28 insertions, 7 deletions
diff --git a/src/modules/fw_att_control/fw_att_control_main.cpp b/src/modules/fw_att_control/fw_att_control_main.cpp index 17b1028f9..b040fb5df 100644 --- a/src/modules/fw_att_control/fw_att_control_main.cpp +++ b/src/modules/fw_att_control/fw_att_control_main.cpp @@ -166,6 +166,11 @@ private: float airspeed_min; float airspeed_trim; float airspeed_max; + + float trim_roll; + float trim_pitch; + float trim_yaw; + } _parameters; /**< local copies of interesting parameters */ struct { @@ -197,6 +202,10 @@ private: param_t airspeed_min; param_t airspeed_trim; param_t airspeed_max; + + param_t trim_roll; + param_t trim_pitch; + param_t trim_yaw; } _parameter_handles; /**< handles for interesting parameters */ @@ -335,6 +344,10 @@ FixedwingAttitudeControl::FixedwingAttitudeControl() : _parameter_handles.y_coordinated_min_speed = param_find("FW_YCO_VMIN"); + _parameter_handles.trim_roll = param_find("TRIM_ROLL"); + _parameter_handles.trim_pitch = param_find("TRIM_PITCH"); + _parameter_handles.trim_yaw = param_find("TRIM_YAW"); + /* fetch initial parameter values */ parameters_update(); } @@ -395,6 +408,10 @@ FixedwingAttitudeControl::parameters_update() param_get(_parameter_handles.airspeed_trim, &(_parameters.airspeed_trim)); param_get(_parameter_handles.airspeed_max, &(_parameters.airspeed_max)); + param_get(_parameter_handles.trim_roll, &(_parameters.trim_roll)); + param_get(_parameter_handles.trim_pitch, &(_parameters.trim_pitch)); + param_get(_parameter_handles.trim_yaw, &(_parameters.trim_yaw)); + /* pitch control parameters */ _pitch_ctrl.set_time_constant(_parameters.tconst); _pitch_ctrl.set_k_p(_parameters.p_p); @@ -670,9 +687,13 @@ FixedwingAttitudeControl::task_main() * With this mapping the stick angle is a 1:1 representation of * the commanded attitude. If more than 45 degrees are desired, * a scaling parameter can be applied to the remote. + * + * The trim gets subtracted here from the manual setpoint to get + * the intended attitude setpoint. Later, after the rate control step the + * trim is added again to the control signal. */ - roll_sp = _manual.roll * 0.75f; - pitch_sp = _manual.pitch * 0.75f; + roll_sp = (_manual.roll - _parameters.trim_roll) * 0.75f; + pitch_sp = (_manual.pitch - _parameters.trim_pitch) * 0.75f; throttle_sp = _manual.throttle; _actuators.control[4] = _manual.flaps; @@ -685,7 +706,7 @@ FixedwingAttitudeControl::task_main() att_sp.timestamp = hrt_absolute_time(); att_sp.roll_body = roll_sp; att_sp.pitch_body = pitch_sp; - att_sp.yaw_body = 0.0f; + att_sp.yaw_body = 0.0f - _parameters.trim_yaw; att_sp.thrust = throttle_sp; /* lazily publish the setpoint only once available */ @@ -719,12 +740,12 @@ FixedwingAttitudeControl::task_main() speed_body_u, speed_body_v, speed_body_w, _roll_ctrl.get_desired_rate(), _pitch_ctrl.get_desired_rate()); //runs last, because is depending on output of roll and pitch attitude - /* Run attitude RATE controllers which need the desired attitudes from above */ + /* Run attitude RATE controllers which need the desired attitudes from above, add trim */ float roll_u = _roll_ctrl.control_bodyrate(_att.pitch, _att.rollspeed, _att.yawspeed, _yaw_ctrl.get_desired_rate(), _parameters.airspeed_min, _parameters.airspeed_max, airspeed, airspeed_scaling, lock_integrator); - _actuators.control[0] = (isfinite(roll_u)) ? roll_u : 0.0f; + _actuators.control[0] = (isfinite(roll_u)) ? roll_u + _parameters.trim_roll : _parameters.trim_roll; if (!isfinite(roll_u)) { warnx("roll_u %.4f", roll_u); } @@ -733,7 +754,7 @@ FixedwingAttitudeControl::task_main() _att.pitchspeed, _att.yawspeed, _yaw_ctrl.get_desired_rate(), _parameters.airspeed_min, _parameters.airspeed_max, airspeed, airspeed_scaling, lock_integrator); - _actuators.control[1] = (isfinite(pitch_u)) ? pitch_u : 0.0f; + _actuators.control[1] = (isfinite(pitch_u)) ? pitch_u + _parameters.trim_pitch : _parameters.trim_pitch; if (!isfinite(pitch_u)) { warnx("pitch_u %.4f, _yaw_ctrl.get_desired_rate() %.4f, airspeed %.4f, airspeed_scaling %.4f, roll_sp %.4f, pitch_sp %.4f, _roll_ctrl.get_desired_rate() %.4f, _pitch_ctrl.get_desired_rate() %.4f att_sp.roll_body %.4f", pitch_u, _yaw_ctrl.get_desired_rate(), airspeed, airspeed_scaling, roll_sp, pitch_sp, _roll_ctrl.get_desired_rate(), _pitch_ctrl.get_desired_rate(), _att_sp.roll_body); @@ -743,7 +764,7 @@ FixedwingAttitudeControl::task_main() _att.pitchspeed, _att.yawspeed, _pitch_ctrl.get_desired_rate(), _parameters.airspeed_min, _parameters.airspeed_max, airspeed, airspeed_scaling, lock_integrator); - _actuators.control[2] = (isfinite(yaw_u)) ? yaw_u : 0.0f; + _actuators.control[2] = (isfinite(yaw_u)) ? yaw_u + _parameters.trim_yaw : _parameters.trim_yaw; if (!isfinite(yaw_u)) { warnx("yaw_u %.4f", yaw_u); } |