Re: [Paparazzi-devel] Magnetometer freeze problem occurring AR Drone 2.0

[Ben Laurie]

The interesting question is: do the freezes also occur with paparazzi?

On 30 May 2014 04:44, opersupport <address@hidden> wrote:
> Hi everyone,
>
> I've managed to get around the magnetometer freeze problem by figuring out
> how to reset the navigation board properly in software. From reading
> previous posts, it seems that there was some way to reset the navigation
> board with a GPIO pin, but the question was which one? Someone suggested
> GPIO 181 was the way to do this but this actually controls the bottom LED
> value. Using the GPIO command I did a few tests and this is what I came up
> with:
>
>
>
> PIN 1 to 8 refers the J2 connector between the navigation board and the main
> board as shown here:
> http://3.bp.blogspot.com/-eHypEWpknKc/US125t50ONI/AAAAAAAAL7A/XnoOndqydag/s1600/ardrone04.jpg
> (from http://diydrones.com/profiles/blogs/ar-drone-2-0-teardown)
> GPIO 177 –d lo (1 and 0) – causes PIN 6 to go high/low
> GPIO 178 –d lo (1 and 0)  - causes PIN 2 to go high/low
> GPIO 179 –d lo (1 and 0) -  causes PIN 4 to go high/low
> GPIO 180 –d lo (1 and 0) – causes bottom facing LED to turn OFF (0 ) and
> GREEN ( 1)
> GPIO 181 –d lo (1 and 0) -  causes bottom facing LED to turn GREEN (0) or
> RED (1)
>
> It turns out GPIO 177 is the pin that is used to reset the PIC navigation
> board. By default, it is set to HIGH, when set to LOW the navigation board
> is held on reset. Set it back to high again to reset the board. You will now
> have to send a \1 over serial to the navigation board to command it to send
> data back again.
>
> So in summary:
> 1) When magnetometer freezes, make GPIO 177 go from 1 to 0, then set it 1
> 2) wait a few milliseconds for a full reset
> 3) echo –e –n “\1” > /dev/ttyO1 (this is the command line way but you could
> always re-initalize it as in the paparazzi source code).
>
> Unfortunately sometimes I need to constantly reset the navigation board,
> like, almost every 20-30 seconds. A reboot seems to fix this when this issue
> does occur.
>
> NOTE: This was tested with the latest firmware update.
>
>
>
> --
> View this message in context: 
> http://lists.paparazziuav.org/Magnetometer-freeze-problem-occurring-AR-Drone-2-0-tp15283p15563.html
> Sent from the paparazzi-devel mailing list archive at Nabble.com.
>
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