Re: [Paparazzi-devel] Spektrum Receiver

[Gareth Roberts]

Hi Tilman,

> I have a bet going to be flying on the 24th. And it does not look good.

No problem.  Nearly there.

> btw. I just had a super braindead idea. If I fly three channel ( I have  
> a flying wing that I could use) I could use the yaw channel for a  
> switch. Just with a switchable resistor divider instead of the yaw poti.

I believe I've been able to patch fixedwing to use two channels to control  
mode.
This code is not tested, I think it's right but make sure you test it (a  
lot!) on the ground.

This way, you can just replace your momentary switch with a normal one or  
hold it down to access AUTO2.

The logic is:
Both switches same position (both off or on): Manual
Left switch on, right off: AUTO1
Right on, left off: AUTO2

I've pushed to https://github.com/blutack/paparazzi/tree/double_mode_switch
The relevant commit is  
https://github.com/blutack/paparazzi/commit/5a552ba5695f8d150a6812c69e97c5af1be9424e

You can also modify your local copy by hand, by replacing the function  
autopilot_process_radio_control in
sw/airborne/firmwares/fixedwing/autopilot.h with the function below.

static inline void autopilot_process_radio_control ( void ) {
  //pprz_mode = PPRZ_MODE_OF_PULSE(radio_control.values[RADIO_MODE]);
        #pragma message "WARNING! USING UNTESTED DOUBLE SWITCH MODE CONTROL"
	if ((radio_control.values[RADIO_MODE] < TRESHOLD1) &&  
(radio_control.values[RADIO_GAIN1] < TRESHOLD1)) {
                pprz_mode = PPRZ_MODE_MANUAL;
	} else if ((radio_control.values[RADIO_MODE] > TRESHOLD2) &&  
(radio_control.values[RADIO_GAIN1] < TRESHOLD1)) {
                pprz_mode = PPRZ_MODE_AUTO1;
	} else if ((radio_control.values[RADIO_GAIN1] > TRESHOLD2) &&  
(radio_control.values[RADIO_MODE] < TRESHOLD1)) {
                pprz_mode = PPRZ_MODE_AUTO2;
        } else {
                pprz_mode = PPRZ_MODE_MANUAL;
        }
}

As I said, I haven't tested this.  Please don't hold me responsible if it  
destroys your plane.
It would be nice to do this via a module, but I don't believe it's  
possible.

Cheers,
Gareth

On Wed, 13 Jun 2012 17:30:55 +0100, Tilman Baumann <address@hidden>  
wrote:

> On 13/06/12 17:24, Gareth Roberts wrote:
> > Hi Tilman,
> >
> > > I suppose you added the V8R7-SP receiver to the list because it is  
> > > compatible and has ppm?
> >
> > Yes.  I use TFR4-B's (FAAST compatible receiver with PPM output), with  
> > a Futaba T8FG transmitter.
> > But for the FAAST compat stuff, the TX is expensive.
> Ah, I thought it is Turnigy compatible.
> > > But I'm not sure what it will mean. If you could perhaps help me make  
> > > sense of it.
> > Huh, thanks for digging this out.
>
>
> Wow, that is a bit. Will read that later.
>
> btw. I just had a super braindead idea. If I fly three channel ( I have  
> a flying wing that I could use) I could use the yaw channel for a  
> switch. Just with a switchable resistor divider instead of the yaw poti.
>
> Perhaps if I get desperate enough...
>
> I have a bet going to be flying on the 24th. And it does not look good.
> And I don't have the budget to throw money at the problem and get a  
> proper transmitter.
>
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