Re: [Paparazzi-devel] lisa/m with mkk controller = problem

[Thomas Wuensche]

Hello,

on booz I solved the problem by increasing the I2C clock
and thus the bandwidth. It needed to change the timing
for the low and high parts of the I2C clock. This was
possible without problem, the standard clock was set
relatively low. It seems the easiest approach to me.

Regards, Thomas

On 27.12.2012 15:19, Eric BAHIER wrote:
> Hi,
>
> It is not a I2C bus speed problem.
>
> The problem is probably, (it was for me) we try to send to many byte on
> the I2Cbus, and the I2C bandwith is too small.
>
> We must refresh the order to the MKK less time, you must reduce the
> quantity of data below the bandwith.
>
> it is pssible, but I don't remenber the correct parameters in the
> airframe.xml file.... I will need it in few days...
>
> Regards,
>
> Eric
>
>
>
>
> Le 27/12/2012 14:45, Eduardo Lavratti a écrit :
> > I think Its not buffer size ... its speed problem.
> > Anyone know if ppz i2c bus run at 100 or 400khz ?
> >
> >
> > On Thu, Dec 27, 2012 at 6:48 AM, Eric BAHIER <address@hidden
> > <mailto:address@hidden>> wrote:
> >
> >     Hi,
> >
> >     In the past with booz (and near futur), I fly an hexa.... I had
> >     the same problem.
> >
> >     The problem was an over load of the I2C bus, we put slower the
> >     data refresh for 6 mkk esc...
> >
> >     I dont rember where we make it slower....
> >
> >     Have nice day,
> >
> >     Eric
> >
> >
> >     Le 27/12/2012 01:54, Eduardo Lavratti a écrit :
> > >     Hello,
> > >     anyone using 6 ou 8 MK esc with lisa/m ?
> > >
> > >     Today i put my lisa/m board on my BiG hexa.
> > >     This hexa fly very well with MK boards.
> > >     i have an mini octo that fly very well with mk boards too.
> > >
> > >     with lisa_m it fly some time and the lisa HANG resulting in crash.
> > >     in second test crashed again.
> > >
> > >     i make some tests in the bench.
> > >     i tested with big hexa setup and mini octo, all with i2c escs.
> > >
> > >     the result:
> > >     with 4 esc the lisa never hang.
> > >     With 6 esc  lisa hang after some time
> > >     with 8 esc lisa hang much faster than with 6.
> > >
> > >     i think it is a i2c buffer problem again.
> > >     I remember i configured the buffer last year an tell felix about
> > >     this problem.
> > >
> > >     i will do more tests today.
> > >     regards.
> > >
> > >
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> >
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> >
> >     Eric BAHIER
> >     15 chemin neuf
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> >
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> Eric BAHIER
> 15 chemin neuf
> 34 980 Montferrier sur LEZ
> France
>
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> Fax : 33 9 59 15 92 53
> ************************************
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