Re: [Paparazzi-devel] simultaneously using two autopilot systems for reliability

[Michal Podhradsky]

Imho the easiest solution is an external watchdog timer - instead of developing FPGA you can just buy a single watchdog chip and connect it to one of the autopilots I/O pins.

That would be also way more reliable by aerospace standards.

On Mon, Nov 25, 2013 at 10:22 AM, Michal Podhradsky <address@hidden> wrote:

Refik,

since you mentioned using I2C, look at the pending issue with I2C causing the autopilot to freeze (https://github.com/paparazzi/paparazzi/pull/531). What happens if you disable the I2C sensor, does it still hang?

Also, do you have a debugger (http://paparazzi.enac.fr/wiki/JTAG)? That would be probably the easiest way to find what happened.

M

On Mon, Nov 25, 2013 at 9:40 AM, Eduardo lavratti <address@hidden> wrote:

When i do the first test with mine lisa_m it reset or hang.
This occur when i power the board with 12v and the internal regulator work very hot and then turn off.

To solve this i use a external 7.4volt regulator that power the board.

After this the board not hang anymore.

---

From: address@hidden
Date: Tue, 26 Nov 2013 00:51:55 +1100
To: address@hidden

Subject: Re: [Paparazzi-devel] simultaneously using two autopilot systems for reliability

 Although we do not give power to the Ets in the upload, its 7 segment display works and blinks. I think that it takes power from I2C pins. Does it create a problem in the upload?

I don't know. Can you remove everything then add them back one by one, testing in between? That's software-guy thinking, maybe a hardware person has a more informed idea...

Chris Gough

Refik

 

 

 

 

 

From: address@hidden [mailto:paparazzi-devel-bounces+refiksever=address@hidden] On Behalf Of Chris Gough
Sent: Monday, November 25, 2013 2:48 PM
To: Paparazzi UAV devel list
Subject: Re: [Paparazzi-devel] simultaneously using two autopilot systems for reliability

 

 

When the modem TX power is 25mw or higher, then the IMU does not work properly and also does the autopilot. It still sends messages, but the behaviour is not normal. The PFD screen does not work properly etc. We can see it on the bench. When the TX power is 1mW, then it works properly.

That makes me very suspicious of a power supply problem. Increasing the power supply (or powering the modem independently) is so much simpler than a failsafe/failover system.

 

Sorry if you've exhausted this line of enquiry already, but these components are usually very reliable so something must be going wrong.

Sometimes, it completely freezes and the leds do not blink. I think that we have also problems in upload.  We haven't yet tried the verification procedure of uploaded stream.  The autopilot starts working, but when it jumps to a problematic part of the code, then it stops.

What is the problematic part of the code? Does it correlate with a burst of telemetry transmission?

 

What peripherals do you have on the powered from the autopilot? 

 

Chris Gough

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