Re: [Paparazzi-devel] Lisa/M questions

[antoine drouin]

ppm on lisa/M works, and so does it on lisa/L

Regards

Poine

ps: on lisa/M, PPM is at the moment sharing a line with servo6 (
because it's the way it was wired on lisa/L ). It would be trivial to
adapt the driver to use another line. look at
sw/airborne/arch/stm32/subsystems/radio_control/ppm_arch.c

On Wed, Jun 8, 2011 at 6:57 AM, Eric Parsonage <address@hidden> wrote:
> Hi Chris
>
>
>> I emailed Jobey this question, Piotr replied that only the Spectrum RC
>> is currently implemented (not PPM). He hinted it would be possible
>> port the PPM stuff to Lisa/M. I suppose if you aren't using a pair of
>> spectrum satelites there would be two UARTs going spare, no idea if
>> some of that IO could be re-purposed for PPM input though.
>
> I wrote the spektrum parser so can give you a definite answer on this. YES 
> the UART pins can be used as general purpose i/o and could be used for ppm 
> input. I don’t think it would take that much effort to re-map to use one of 
> those pins.
>
> Why would you want to though ? The Spektrum satellites can be purchased 
> individually for less than $35 for a genuine Spektrum satellite receiver and 
> the clone receivers can be had for $15
>
> Quality PPM receivers are not any cheaper than this and hacking a receiver to 
> get ppm out adds risk whereas the Spektrums  satellites need no modification. 
> If you where not thinking of hacking a PPM receiver but instead using an 
> encoder board then you end up with the ugliest wiring ever.
>
> I am really interested in hearing why it is better for you to use PPM it 
> might hep with future development.
>
> Eric
>
>
>>
>> I didn't ask about open source hardware, but I did wonder :)
>>
>> Chris Gough
>>
>> On Tue, Jun 7, 2011 at 9:51 PM, Christoph Niemann
>> <address@hidden> wrote:
>>> Hi community,
>>>
>>> having a look at the wiki-site of the Lisa/M I was a little bit confused. Is
>>> the only possible RC Spektrum (and JR and Hobbyking)? Or is it also possible
>>> to use classic PPM and JETI 2.4Ghz?
>>> The other thing, that would matter in the process of deciding, whether to
>>> purchase it or not is, will it be OpenSource or not?
>>>
>>> Thanks for your answers
>>>
>>> Christoph
>>>
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>>>
>>
>>
>>
>> --
>> .
>>
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