Re: [Paparazzi-devel] Lisa/M questions

[Chris Gough]

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

that's cool, why am I not surprised :)

Chris Gough

On Wed, Jun 8, 2011 at 3:58 PM, antoine drouin <address@hidden> wrote:
> 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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>>> .
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