Topic: Anyone seen this error before?

[Maumelle Weather]

Hi Folks,

Saw on Blitzortung where my system is showing a Comm. Err. Went to the config page and found this. Haven't seen this before. Has anyone else?  I'm tempted to re-flash the firmware again and see if that corrects the problem.



John


And now the error is gone. Possible temperature issue with regards to expansion/contraction of the board as to where it's located?  Haven't had any issues prior to this, and it has been mounted in my storage building since May 2014. Its seen temps of 42°C last summer and -13°C so this winter.

[miraculon]

John,

I looked at the schematic and I can see that on the STM Daughtercard connector P1, there are two signals:

PCB ID 0 on pin 42
PCB ID 1 on pin 43

and on P2 there are two more:

PCB ID 2 on pin 31
PCB ID 3 on pin 33

I would check the solder joints on these pins and the connection quality to the STM board. These are the only circuit nets that look related to board identification.

Greg H.

[Maumelle Weather]

Thanks Greg for the information. Its very strange. This just started within the last couple of days. I had noticed it after I had gotten to work in the mornings, but once it warmed up some, it goes away.

I'll check those connections.

John

[miraculon]

John,

If the controller gets into this mode again, you could probe the pins on the top of the STM board as follows:

PCB ID 0 on pin 42 PD10
PCB ID 1 on pin 43 PD11
PCB ID 2 on pin 31 PD3
PCB ID 3 on pin 33 PD1

Since they are all supposed to be grounded by the RED board (0V), if any of these are at a logic "high" that should be your culprit. Of course, I am not 100% certain whether your error message is caused by the reading of these pins since I don't know what is going on inside the firmware. It is just my "hunch"...

The STM32F4 Discovery User Manual has these pin descriptions.

Greg H.