Maple-mini USB Connection « LeafLabs Garden

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Maple-mini USB Connection

(8 posts) (5 voices)

Started 3 years ago by
Latest reply from mbolivar

Anonymous
Unregistered

Hi all,

Recently purchased the Maple-mini board and have been using the Linux command-line toolchain. When trying the test-session.cpp program, I found that after I uploaded the program successfully (albeit having to press reset on the board first so that the computer would detect a dfu device), it reads the message - Resetting USB to switch back to runtime mode. I understand that this needs to happen but my Ubuntu is not picking it back up again - i.e. no ttyACM0 port appears in the /dev directory. Thus, I cannot use the 'interactive' features of the program using either minicom or screen. Unplugging and replugging the device or using the reset button does nothing - i.e. dmesg registers a new device was plugged in and then automatically disconnects it! Thus I cannot use any USB interaction! Can someone please please help?!! I need to have this system running ASAP for my project.

OS: Ubuntu 12.04

Cheers!

Posted 3 years ago #
feurig
Member

I often have this issue when I compile code for the wrong processor. You should be able to recover by putting it into permanent bootloader mode as described here. http://leaflabs.com/docs/troubleshooting.html#troubleshooting-perpetual-bootloader

Posted 3 years ago #
Anonymous
Unregistered

Hi feurig,

Perpetual bootloader allows me to reupload the code (after double and triple-checking that I am in fact compiling for maple-mini: make BOARD=maple_mini install), but it does not return /dev/ttyACM0. That is, it cannot be used for serial USB communication like the interactive program requires. So when I run: ls /dev/ttyACM* - I don't find any directories!

Posted 3 years ago #
ventosus
Member

You have to set the environment variable BEFORE running make

BOARD=maple_mini make install

Posted 3 years ago #
asterix
Member

I have found a work around for this. In your setup function write in something like this:

while (SerialUSB.available() < 1 )
{
SerialUSB.write('a');
delay ( 1000);
}

This somehow forces the commm port open ;)

Posted 3 years ago #
Anonymous
Unregistered

I'm sorry but none of this has worked :( ttyACM just doesn't even show up in the /dev directory!! Bootloader worked, code uploaded - I rearranged the make/environment command and still no response from screen. Why aren't any ttyACM devices showing up?

Posted 3 years ago #
Anonymous
Unregistered

OK IT ALL WORKs.

So somehow, usb must have been disabled at some point. To fix this, I added SerialUSB.enable() into a sample program and uploaded it. ttyACM0 came back and all was good! asterix - I also added your code in as a way to prevent the code from moving on until I could see the output - neat! thank you! So if ever ttyACM0 disappears, just need to upload a program with SerialUSB.enable() and it'll be back!

Thanks everyone!

Posted 3 years ago #
mbolivar
LeafLabs

So somehow, usb must have been disabled at some point. To fix this, I added SerialUSB.enable() into a sample program and uploaded it. ttyACM0 came back and all was good!

That is very strange. This all works for me on Ubuntu 12.04, and SerialUSB.begin() gets called from init(), so you shouldn't need to call it yourself.

Did you forget to call init() in your premain(), like we do in all of our example code? Can you post a short, complete example program that exhibits the problem (no /dev/ttyACMx showing up)?

Posted 3 years ago #

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