this allows for an offset in ESC numbering for much more efficient CAN
bandwidth usage.
For example, on a coaxial OctoQuad quadplane the ESCs are typically
setup as outputs 5 to 12. An ideal setup is to split these over 2 CAN
buses, with one CAN bus for the top layer and the one bus for the
bottom layer (allowing for VTOL flight with one bus failed).
Without this offset parameter you would be sending RawCommand messages
like this:
bus1: [ 0, 0, 0, 0, ESC1, ESC2, ESC3, ESC4 ]
bus2: [ 0, 0, 0, 0, 0, 0, 0, 0, ESC1, ESC2, ESC3, ESC4 ]
this is very wasteful of bus bandwidth, with bus1 using 3x the
bandwidth it should and bus2 using 4x the bandwidth it should (the
above will take 3 can frames for bus1, and 4 can frames for bus 2)
With this patch you can set:
CAN_D1_UC_ESC_OF = 4
CAN_D2_UC_ESC_OF = 8
and you will get this on the bus:
bus1: [ ESC1, ESC2, ESC3, ESC4 ]
bus2: [ ESC1, ESC2, ESC3, ESC4 ]
that takes just 1 can frame per send on each bus
when we arm in guided mode then enter a special guided_wait_takeoff
state. We keep motors suppressed until one of the following happens
1) disarm
2) guided takeoff command
3) change to AUTO with a takeoff waypoint as first nav waypoint
4) change to another mode
while in this state we don't go to throttle unlimited, and will refuse
a change to AUTO mode if the first waypoint is not a takeoff. If we
try to switch to RTL then we will instead use QLAND
This state is needed to cope with the takeoff sequence used by QGC on
common controllers such as the MX16, which do this on a "takeoff"
swipe:
- changes mode to GUIDED
- arms
- changes mode to AUTO
In the case of the compass calibrator we do not want to use the GSF
result if any model is degenerate. We've had a compass calibrate in
flight 180-degrees out from what it should have.
when RC_OPTIONS has been changed to not check throttle for arming then
treat this like a sprung throttle for quadplane throttle suppression
in auto-throttle modes, and only unsuppress when throttle goes above
trim+dz
this helps when the aircraft has gone into a landing sequence due to a
failsafe before it is armed. Arming while in the landing sequence is
very unlikely to be what the user wants
