FW RWTO: add throttle_ramp_time parameter RWTO_RAMP_TIME

* add throttle_ramp_time parameter support fixed wing runway takeoff

src/modules/fw_pos_control_l1/runway_takeoff/RunwayTakeoff.cpp

@@ -57,8 +57,7 @@ RunwayTakeoff::RunwayTakeoff(ModuleParams *parent) :
 	_initialized(false),
 	_initialized_time(0),
 	_init_yaw(0),
-	_climbout(false),
-	_throttle_ramp_time(2 * 1e6)
+	_climbout(false)
 {
 }
 
@@ -79,7 +78,7 @@ void RunwayTakeoff::update(float airspeed, float alt_agl,
 
 	switch (_state) {
 	case RunwayTakeoffState::THROTTLE_RAMP:
-		if (hrt_elapsed_time(&_initialized_time) > _throttle_ramp_time) {
+		if (hrt_elapsed_time(&_initialized_time) > _param_rwto_ramp_time.get() * 1e6f) {
 			_state = RunwayTakeoffState::CLAMPED_TO_RUNWAY;
 		}
 
@@ -195,7 +194,7 @@ float RunwayTakeoff::getThrottle(float tecsThrottle)
 {
 	switch (_state) {
 	case RunwayTakeoffState::THROTTLE_RAMP: {
-			float throttle = hrt_elapsed_time(&_initialized_time) / (float)_throttle_ramp_time *
+			float throttle = (hrt_elapsed_time(&_initialized_time) / (float)_param_rwto_ramp_time.get() * 1e6f) *
 					 _param_rwto_max_thr.get();
 			return throttle < _param_rwto_max_thr.get() ?
 			       throttle :

src/modules/fw_pos_control_l1/runway_takeoff/RunwayTakeoff.h

@@ -98,7 +98,6 @@ private:
 	hrt_abstime _initialized_time;
 	float _init_yaw;
 	bool _climbout;
-	unsigned _throttle_ramp_time;
 	matrix::Vector2f _start_wp;
 
 	DEFINE_PARAMETERS(
@@ -110,6 +109,7 @@ private:
 		(ParamFloat<px4::params::RWTO_MAX_PITCH>) _param_rwto_max_pitch,
 		(ParamFloat<px4::params::RWTO_MAX_ROLL>) _param_rwto_max_roll,
 		(ParamFloat<px4::params::RWTO_AIRSPD_SCL>) _param_rwto_airspd_scl,
+		(ParamFloat<px4::params::RWTO_RAMP_TIME>) _param_rwto_ramp_time,
 		(ParamFloat<px4::params::FW_AIRSPD_MIN>) _param_fw_airspd_min,
 		(ParamFloat<px4::params::FW_CLMBOUT_DIFF>) _param_fw_clmbout_diff
 	)

src/modules/fw_pos_control_l1/runway_takeoff/runway_takeoff_params.c

@@ -144,3 +144,15 @@ PARAM_DEFINE_FLOAT(RWTO_MAX_ROLL, 25.0);
  * @group Runway Takeoff
  */
 PARAM_DEFINE_FLOAT(RWTO_AIRSPD_SCL, 1.3);
+
+/**
+ * Throttle ramp up time for runway takeoff
+ *
+ * @unit s
+ * @min 1.0
+ * @max 15.0
+ * @decimal 2
+ * @increment 0.1
+ * @group Runway Takeoff
+ */
+PARAM_DEFINE_FLOAT(RWTO_RAMP_TIME, 2.0f);