Replies to This Discussion

ModeratorPermalink Reply by John Church on May 17, 2011 at 9:53am

Hi,

You may have already done these, but it must be mentioned.

*Make sure/verify (I would set it in your APM_config.h) the APM is configured to the baud rate of your xbees, or vise-versa.

*Make sure to reset the EEPROM and reset factory settings.

Good luck!

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Permalink Reply by Jerry Jost on May 17, 2011 at 10:13am

Thanks John - I'll try the settings in apm_config.h - I think that may solve my Xbee problem.  I still have the general communications problem with usb though.  I have resetted factory settings several times (no less than 5) and have different results when I boot up.  It's getting frustrating as I had most things working with Ardupirates (which doesn't seem to work any more now) then switched to ACM (latest and greatest).  I think the mavlink read packet errors are an indication of something wrong but I can't seem to find a resolution there.  I'm concerned that even if I get teh XBee working, I may have errors there as well. 

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Permalink Reply by Steven Harsanyi on May 17, 2011 at 10:58am

I also cannot connect with usb. I never tried xbee yet. I tried multiple svn versions and loaded code from APM Planner. I can setup with CLI mode with usb no problem. When I try to setup sensors with switch forward Mavlink reports
CommsServer listern accept
CommsServer listern wait
MAVLink readpacket read error: NetSerial Timeout on read
bps 0 loss 0 left 0
Mavlink Bad Packet (crc fail) len 0 crc 65535 pkno 0
MAVLink readpacket read error: NetSerial Timeout on read
bps 0 loss 0 left 0
This happens on my xp netbook and win7 desktop.

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Permalink Reply by Jerry Jost on May 17, 2011 at 11:14am

Thanks Steven - that's exactly what I'm getting. 

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ModeratorPermalink Reply by John Church on May 17, 2011 at 12:01pm

Hi,

In Arduino, or any other serial terminal configured to the correct baud rate of the APM's USB port, what is the output? Is it consistent using this method? Is it just the MAVLink connection that's being a pain?

Thanks- let us know.

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Permalink Reply by ThomasB on May 17, 2011 at 12:08pm

Hi all,

seems that I've the same problems.

Same MAVlink errors like Steven.

CLI Mode over USB works error free. so setup was done very quick.

But after switching to flightmode (and repower the system) MAVlink comm errors (over USB).

Default Firmware AC2 with + configuration APM2560

 

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3D RoboticsPermalink Reply by Chris Anderson on May 17, 2011 at 12:31pm

Are you sure you're switching the Mission Planner baud rate to 115200 for USB? I can't replicate this problem on my machine.

And are you using the HK GCS?

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Permalink Reply by ThomasB on May 17, 2011 at 12:48pm

Hi Chris

I used the the AC2Setup of the Mission Planer.

In Setupmode all ok, in Sensor mode error messages like steven.

So baudrate shouldn't be the problem.

Maybe the flightmode is the problem. maybe one of the busses (i2c,spi) working not well

in our configuration and slow down the software so much that mavlink will produce timeouts?

 

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Permalink Reply by Jerry Jost on May 17, 2011 at 12:50pm

Hi Chris-

 

I am switching to 115200 for USB and attempting to do the same for XBee.  USB works with the errors that Steven mentioned.  I (and I believe many others) are getting the same result.  I've tried otehr baud rates and resetting and reloading.  I've put 30 hours into this in the past four days.  I'm never getting to the GCS as I'm not completing setup becasue of the communications problem.  The mavlink program errors out about every 15 minutes, requiring reset.  This is happening on three different machines similarly (xp and windows 7).

I realize it's hard to diagnose if you can't duplicate the prblem.  I'd be happy to send screen prints, diagrams, blood tests ;), or whatever else may help you. 

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Permalink Reply by Sanjaya Kumar on May 17, 2011 at 12:58pm

I'm having the same problem with Arducopter 2.0 Beta 3. First I had problems with Xbee, so putting that aside I tried using the USB connection.

I changed GCS_PORT to 0 in APM_config.h (and commented out the 3 lines between ifndef in config.h that set the GCS_port to 3 based on Chris's comments above those lines).

When I start up ArdupilotMegaPlanner, it works on ArduCopter Initial Setup. The CLI on Initial Settings also works.

Then I click on "Raw Sensor". It asks me to move the slider <away from rc connections>.

Then MAVLink opening fails and I see "MAVLink readpacket read error: NetSerial timeout on read" and eventually a CommsServer Shutdown.

I restart ArdupilotMegaPlanner and go to Initial Settings and verify that the CLI still works.

I get the same MAVLink timeout on GCS MAVLink and PID Config - AC2.

 

So it appears that I can't get MAVLink to work on USB. I verified that (a) Baud rate on the USB COM port is 115200 and and matches the settings in "Options" on APM planner (b) "Set RTS on Close" is turned on in the Advanced port settings in Device Manager.

Anything else I can try?

 

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3D RoboticsPermalink Reply by Chris Anderson on May 17, 2011 at 1:01pm

There should be no need to change any code at this point. The latest versions of AC2 have MAVLink running automatically on both the USB and Xbee ports.

Are you loading the code from the Mission Planner?

Are you restarting the APM board after you move the slider switch?

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Permalink Reply by Jerry Jost on May 17, 2011 at 1:05pm

Yes - The first time I uploaded the code from Mission Planner, the XBee didn't work and it wasn't responding to the throttle correctle, so I reset, cleaar eeprom, reloaded, other similar problems started, including the communications problem.  I've uploaded the firmware at least a half dozen times, very few with exactly the same results but never entirely successful.  Xbee hasn't worked since I switched to ACM and mavlink has worked to varying degrees of success.

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