In order to use px_uploader as a module from another Python script, all
the action needs to be moved into a main() function which is only called
if the file is run directly.
Sometimes right after reboot, we got a `raise SerialException(
msg.errno, "could not open port {}: {}".format(self._port, msg))`.
If this happens now, we will just try again later.
We need to differentiate between a level where the user should act and where we are about to fall out of the sky (emergency). This helps performing more suitable failsafe actions.
to prevent a setpoint step when moving the stick over the border of the deadzone
and to enable very small inputs even from a control stick that needs a big deadzone
If param_find() returned PARAM_INVALID, and this was directly passed to
param_get(), param_get_value_ptr() returned null and we read garbage data
(or segfaulted on systems with virtual memory).
On px4fmu-v2, this happened for the param ATT_VIBE_THRESH in sensors.
Because of the recently added parameter scoping, this param got pruned, as
it's defined in attitude_estimator_q.
credits for finding this go to Jeyong Shin (jeyong).
The maximum number of missions was increased in almost 8 times in
recent commit: 9369262e63 navigator: allow more mission items.
As this board loads missions in RAM, now it don't have enough memory
to allocate causing dataman start to fail, so mark it as a memory
constrained system and reduce the number of maximum missions
supported.
Even for well calibrated RC sticks 5% stick movement is a too small margin for the end user that might not land because of this.
15% is still clearly restricting the stick far down.
This is a functionally equivalent. It moves all of the code for the terrain estimator into a single function call from the main filter update, making it clear that it is independent of the main filter.
The tilt compensation being applied previously was based on a flat earth geometric model assuming perfect tilt knowledge which reduces the effect of range errors on height error as the vehicle tilts. however in the real world, variations in terrain gradient and uncertainty in vehicle tilt and sensor alignment tend to increase height error with tilt, so the adjustment of observation variance with tilt has been removed given we do not have a valid mathematical model on which to base it.
Julian Oes