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helloworld example on TWR-K64F120M

Question asked by Kevin Alden on Jan 23, 2015
Latest reply on Jan 23, 2015 by Kevin Alden

I am trying to get the serial terminal working with the TWR-K64F120M.  I have the hello world demo program building and running on the target, but I can never see anything coming out on my PC.  I have the JLink openSDA application running on the board and gdb is able to connect, load a program, and step through code no problem.  I can see things initialize and the code gets to my PRINTF line.  I can also see the activity LED on the board go crazy while printf is executing, so I believe everything on the board is actually running properly.


Now, on the linux side, when I plug into the USB debug port on the board I see a /dev/ttyACM0 device appear.  I believe this is meant to be the virtual serial port connected to the K64.  I am running the following to open a terminal to it:  sudo screen /dev/ttyACM0 115200

Nothing ever shows up though.  Am I going about this wrong?  Maybe I have a jumper on the board set wrong?  Any tips would be appreciated.