Cant comm with Arduino through Linux after uploading sketch

Discussion in 'Troubleshooting' started by jaykudo, Mar 13, 2014.

  1. jaykudo

    jaykudo New Member

    Jan 12, 2014
    Likes Received:
    Hi everyone,

    I tried posting this question up in the Arduino IDE section of the forum, but this particular issue seems to overlap with a few sub-forums and I didn't get any response with the previous post. So here I am posting it in a related sub, hoping someone can help me.

    Bit of an obscure issue, but very easily replicated.

    I am running Linaro Ubuntu 12.04 on the UDOO. When attempting to communicate through Linux to the Arduino (using /dev/ttymxc3 serial interface) after a fresh Linux boot, everything works fine.

    root@udoo:~# stty -F /dev/ttymxc3
    speed 9600 baud; line = 0;
    -brkint -imaxbel
    root@udoo:~# stty -F /dev/ttymxc3 115200
    root@udoo:~# cat /dev/ttymxc3
    [TEMP] - Temperature is 43.41 C
    [SERIAL] - Input char
    [FAN] - Timer started. Fan will run for 320 seconds, unless temp drops below 30C first
    [TEMP] - Temperature is 43.18 C
    [SERIAL] - Input char
    (the serial output from the Arduino is seen after the 'cat' command. Everything is working fine here)

    I can reset the Arduino (by way of using the RESET pin and some code (as seen in STEP 1, here: ... -software/) and all is still working fine.

    But then, when I upload the sketch to the Arduino (using USB cable to my PC and J18 disconnected) 'cat' no longer shows any output. It remains this way until I reboot Linux. Then it works again until I upload a sketch to Arduino again.

    Has anyone else had this same issue? Any way to fix this?

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