[SOLVED] USB connection mistery

C programming, build, interpreter/VM.
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kamikaze
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[SOLVED] USB connection mistery

Post by kamikaze » Thu May 23, 2019 6:31 pm

Updated to latest MP version (1.10+) in git master... flashed my PyBoard v1.1 and then my working-for-a-long-time-not-modified code started to misbehave... when connecting to laptop (same as always) it works for ~15 sec, then red led flashes and my SPI display which shows different information - hangs. When connecting via screen command and running the same function - it works forever. Going to investigate, so the question is: what is the most correct way to downgrade firmware? I mean is it enough to git checkout v1.9.4 ?

Code is HERE
Last edited by kamikaze on Thu May 30, 2019 9:14 pm, edited 2 times in total.

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jimmo
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Re: v1.10 mistery

Post by jimmo » Thu May 23, 2019 10:14 pm

Maybe easier (and will eliminate any potential issues in your build env) to download the stock 1.9.4 firmware from micropython.org/download and flash it via DFU the ordinary way. Maybe you could compare the nightly build with your own build at master? (Unless you have local mods / frozen modules)

But yeah, should be fine to checkout at 1.9.4.

Really interesting that having the console connected makes a difference...

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jimmo
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Re: v1.10 mistery

Post by jimmo » Thu May 23, 2019 10:24 pm

Btw, when it crashes, are you subsequently able to open up the console and get to the REPL? Or has it fully locked up? Or is it in a state where you can ctrl-c back to the repl?

And just to confirm that in both scenarios, it's the same power supply (usb from your laptop), the only difference is whether you have screen open?

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Re: v1.10 mistery

Post by kamikaze » Fri May 24, 2019 9:35 pm

yes, everything is the same. the different is the way I launch the same function. after crash I can open the screen, but I need to Ctrl+C first to get a prompt. Will try official 1.9.4 now

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kamikaze
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Re: v1.10 mistery

Post by kamikaze » Fri May 24, 2019 9:44 pm

Ok. it seems that something is wrong... 1.9.4 and 1.9.3 crash the same... the only guess here is - Linux is being continuously updated so who knows... what have been changed there. will try to boot my older version from external HDD

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Re: v1.10 mistery

Post by dhylands » Fri May 24, 2019 11:14 pm

Do you have ModemManager installed on your machine? If it is installed then it will try to connect to /dev/ttyACM0 when you plug in your pyboard and it will send AT commands to your board.

Depending on the code you've got running, this can cause issues.

I normally unintall modemmanager:

Code: Select all

sudo apt remove modemmanager

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Re: USB connection mistery

Post by kamikaze » Mon May 27, 2019 9:09 pm

Connected to Windows machine - PyBoard works ok. Thanks for the tip, will check w/o modemmanager soon if it is installed.

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Re: [SOLVED] USB connection mistery

Post by kamikaze » Thu May 30, 2019 9:15 pm

Yes, that was a modemmanager... Thanks

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