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

[Oswald Berthold]

hi daren,

that sounds like good news. will try and check next week on the
hardware.

is there something like a "stalled sensor" (values don't change when
they should) alarm module for ppz that could trigger the reset?

bst, opt

Ben Laurie writes:

> 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.