Re: [Paparazzi-devel] PPM Encoder and Lisa/L

[Christophe De Wagter]

The radio file should correspond to the summed pulses arriving at the autopilot:

-in case of analog 35MHz receivers it is the RC - TRANSMITTER that makes the pulse train (receiver only does RF part) 

   => radio file depends on transmitter, you could swap to another receiver (and e.g. you can use a 4channel receiver to receive 9 pulses :-) )

-in case of digital receivers it is not the transmitter but the receiver that makes the pulses

   => e.g. Futaba Fasst 6017: you can use any compatible transmitter without need to change the radio file

-in case of an encoder it is the encoder that makes the summed pulse

   => if the encoder software makes 8 pulses, even with a 5 channel RC connected paparazzi will get 8: so the radio file should read 8

-Christophe 

On Fri, Nov 18, 2011 at 10:13 AM, Felix Ruess <address@hidden> wrote:

But since the 8 channel PPM encoder actually always outputs 8
channels, you have to define 8 channels in your radio.xml file like in
the example on the wiki.

Cheers, Felix

On Fri, Nov 18, 2011 at 10:03 AM, Jochen Rieger <address@hidden> wrote:
> In the radio file is also just configure 6 channels(6 channel receiver). I
> wanted just say that is the 8 channel PPM encoder from Hendrix.
>
> -Jochen
>
> 2011/11/18 Christophe De Wagter <address@hidden>
>>
>> You have 6 zero's in the rc-message view, while the encoder sends 8
>> channels? That sounds like a radio.xml not being compatible with the number
>> of pulses?
>> Note that paparazzi PPM reading is very selective. This dates from the
>> time where everyone was using 35MHz. If 2 transmitters were on the same
>> frequency, you wanted to be sure that paparazzi would not accept this
>> corrupted signal.
>>
>> -Christophe
>>
>>
>>
>> On Fri, Nov 18, 2011 at 8:33 AM, Jochen Rieger <address@hidden>
>> wrote:
>>>
>>> Hello,
>>>
>>> i have a problem with the PPM at Lisa/L. I can see an signal at PPM
>>> output of the 8 Channel PPM Encoder Version 2, that seems to be a PPM
>>> signal(measured with scope). The input port of the PPM signal is the Trig.
>>> port of UART1 at Lisa/L (pin 1).
>>> But when I set the tele_FBW to 1 in GCS. I see only 0,0,0,0,0,0  in the
>>> value message window.
>>>
>>> I have setup the radio file like the wiki. The right pulse_type and the
>>> right numbers of input channelns.
>>> Have anyone an idea?
>>>
>>> Best regards.
>>> Jochen
>>>
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>>>
>>
>>
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>
>
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