Compass 5883 is not support in APM:Plane 3.3.0

[Jin Chengde]

Hi Guys，

 I used APM2 for plane, recently, I update to 3.3 for APM:Plane, and can not connect GCS through MAVLINK

 I check the UART0 print, it shows "No Compass backends available" and system initial failed.

 then I see code, in the function _detect_backends in Compass.cpp, there is no HMC5883 any more.

 So, is that mean APM:Plane 3.3 is not support for APM2?

[Tom Coyle]

Hi Jin,

I have been able to communicate with my Pixhawk running ArduPlane 3.3.0 over both USB and 3DR telemetry and have not had an issue with the compass in the GPS/Compass module.

Regards,

Tom C AVD

[Jin Chengde]

It happened in APM2 but not in Pix, I used 3.2.0, apm could find the compass, but when i update to 3.3.0. it fail, no compass could find.

[Lucas De Marchi]

We are using HMC5883 in a linux board (minnowboard max, still to send
to upstream).
Looking at the code, the code in _detect_backends() still has the code
to use HMC5883:

#if CONFIG_HAL_BOARD == HAL_BOARD_LINUX && CONFIG_HAL_BOARD_SUBTYPE !=
HAL_BOARD_SUBTYPE_LINUX_NONE
...
#elif HAL_COMPASS_DEFAULT == HAL_COMPASS_HMC5843
_add_backend(AP_Compass_HMC5843::detect);
#elif HAL_COMPASS_DEFAULT == HAL_COMPASS_PX4 || HAL_COMPASS_DEFAULT ==
HAL_COMPASS_VRBRAIN
...
#endif


From AP_HAL_Boards.h:

#elif CONFIG_HAL_BOARD == HAL_BOARD_APM2
...
#define HAL_COMPASS_DEFAULT HAL_COMPASS_HMC5843
...
#endif


So I fail to see why you said the code is not there anymore or why it
doesn't work for you :-/.

--
Lucas De Marchi

[Jin Chengde]

So does HMC5833 and 5843 is the same driver?

[Lucas De Marchi]

On Thu, Jun 11, 2015 at 12:04 AM, Jin Chengde <jinch...@gmail.com> wrote:
> So does HMC5833 and 5843 is the same driver?

Should be. Take a look in AP_Compass_HMC5843::init()

It tries to detect both. We have an HMC5883L in our linux board.

--
Lucas De Marchi

[Jin Chengde]

It looks very strange, does anyone have try in APM2? pixhawk use the same compass but everything is OK, but APM2 is failed.

I have confuse in that serverl days but no thread.

[Daniel Frenzel]

I habe an apm2 with external compass which used to work, but it doesn't. Was not further testing. Maybe just the board is broken.

[Daniel Frenzel]

[Andrew Tridgell]

Hi Jin,

> It looks very strange, does anyone have try in APM2?

yes, I have an APM2 on my desk with a hmc5883 compass that is working
fine with the current plane 3.3.0 stable release. Grant and I also test
flew an APM2 with a hmc5883 before the release.

I suspect you may have a hardware issue.

Cheers, Tridge

[Daniel Frenzel]

It is a little bit late. I just tried out all the branches from 2.9 to 3.2.1 with AVR.

None of them seems to work anymore with 5883L modules.

Neither my APM 2.5 nor 4! external 5883L modules.

Maybe all of them are broken, or something else is wrong :D