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Added RCx_FUNCTION = 30 Engine Run Enable function

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@salience wrote:

"This allows assignment of a free output channel to switch PWM output on and off when armed and disarmed."

Would it be possible to have this function changed just a bit so that:
disarmed PWM is off, but ARMED PWM is RCx_FUNCTION = PASSTHROUGH

This would allow using chs 9 & 10 for main and tail ESCs freeing chs 7 & 8 for RTL and LAND modes. (6 modes just ain't enough with all the new modes you guys have added!)

One could still have the RCx_FUNCTION = 30 = Max when armed in most transmitters such as Taranis by sending max signal on that channel.

Since I use ESCs with GOVs I prefer more direct control of motors, not asking PIX to do anything except pass the signals. But this leads to a tricky scene if you are landed and kill the TX and then the heli quickly rises to RTL altitude! This would be remedied by immediate disarm when landed, then the motors could not spin up.

EDIT: OK, I now see I can use chs 9 &10 for RT and LAND„ so ch8 can be used as directed for main rotor using H_RSC_MODE = 1 = Ch8 Passthrough.

What about tail ESC / rotor on ch7? Same disarm feature possible to prevent spinup? So do I set RC7_FUNCTION to 32-HeliTailRSC for that? Thus to get ch7 PASSTHROUGH when armed, PWM off to ESC when disarmed?

Sorry about the confusion, it's not entirely clear in the older/newer instuctions.

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