I'm having a problem with the Raspberry Pi Pico hello world example using the C/C++ SDK on Ubuntu. When I drag and drop the hello_usb.uf2 binary the USB drive connection to the Pico terminates as expected, but when I run "minicom -b 115200 -o -D /dev/ttyACM0" in my terminal window it returns to the command line after a few seconds without displaying any output from the Raspberry Pi Pico.
I noticed the following warning in the "Getting Started with Raspberry Pi Pico" online document which may be the source of my problem.
If you have not initialised the tinyusb submodule in your pico-sdk checkout then USB CDC serial, and other USB functions and example code, will not work as the SDK will contain no USB functionality.
Question: How do I initialize the tinyusb submodule in my pico-sdk checkout?