I've just released APM:Plane 2.78

This is a bug fix release for a number of important issues found in the 2.77 release. 

The changes in this release are
Fixed sensor start-up on the APM1
I'm embarrassed to say that I didn't test the APM1 for the 2.77 release as my APM1 had died. It was a trivial fix, and the APM1 is working again in 2.78
Pixhawk Barometer fix
Fixed a potentially serious bug on Pixhawk if the board is flown in high temperature environments. If the board temperature gets above 65 degrees C then some boards would get bad barometric readings, thus giving bad altitude readings. This fix was a change in the GPIO settings on the SPI bus used to talk to the MS5611 barometer. Many thanks to Darrell Burkey for supplying the log file that found this bug.
Fixed LED behaviour on Pixhawk
The large 3 colour LED should now correctly display the failsafe and GPS status
Improved PX4 and Pixhawk compass calibration
We now run a strap calibration on every boot which improves compass accuracy by a small amount
Added RSSI_RANGE parameter
This allows you to scale your RSSI input to match your receiver
Fixed GPS health status in MAVLink
The GPS health bit will now show as unhealthy if the GPS does not have 3D lock. Thanks to Iskess for reporting this issue!
Also thanks to everyone who gave feedback on 2.77, much appreciated!

Issues with this release should be posted on the APM:Plane forum

Views: 4234

Comment by Jani Hirvinen on January 29, 2014 at 8:59pm

Congratulations tridge. Now we don't need to worry so much about baro issues. yay

Comment by Gary McCray on January 29, 2014 at 9:54pm

Great update Tridge: I added it to the APMPlane wiki too:


Comment by Adam Erickson on January 29, 2014 at 10:25pm

Thank you! Are you seeing any difference when running this on a Pixhawk versus an APM 2.6?

Comment by Randy on January 29, 2014 at 11:43pm

To resolve the same baro issue mentioned above we've pushed out ArduCopter-3.1.2-rc1 (a release candidate).  After this has gone through some testing for a few days we will make it the official release for copter.  More copter specific details/discussion at the end of the AC3.1 release thread.

Comment by Darren Royle on January 30, 2014 at 12:57am

thank you for all your hard work...well done

Comment by Jack Crossfire on January 30, 2014 at 1:14am

It's been 3 days since your last release.  Slacker.

Comment by Austin Suhler on January 30, 2014 at 8:54am

Thanks guys, can't wait to start tuning my X-8! On that note, any idea when auto-tuning will be added? ;) Just kidding, great work guys!

Comment by json on January 31, 2014 at 1:12am

hi tridge! after updating to 2.78, I cant seem to change the RC1_REV using APM planner 2.0.  Changing it to "-1" gets 'written' but after a reboot, the old value of '1' returns.  I was able to do this in 2.77.

Comment by json on January 31, 2014 at 1:42am

ok this seems to have been fixed with 2.78b.. thanks!

Comment by Andrew Tridgell on January 31, 2014 at 3:49am

Hi Jayson, yep, there was an 'oops' in 2.78 fixed in 2.78b thanks to sharp eyes from Valince on the patch.

Cheers, Tridge


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