Navigate to build directory, you can remove all contents (with rm -rf *) in that folder. Execute 'cmake ../hello_usb' from that folder, the folder will get populated with the project selected, in this case 'hello_usb'. Type 'make' after cmake has setup the project in the build folder.
Assuming you have a *.cfg set up that works with your programmer and rp2040, execute an upload as follows with openocd :
openocd -f ../pico.cfg -c "targets rp2040.core0; program hello_usb.elf verify reset exit"
Start openocd in a terminal window with :
openocd -f ../pico.cfg
Start gdb with the elf file that you'd loaded on another terminal window with and run the macro shown with it :
gdb -x ../gdbinit ./hello_usb.elf
With all wired and hooked up correctly, you can issue command
mri
to renitialize the monitor reset the device, then
cll
to perform compile, link load. At that point program will be loaded and ready to start, set up whatever monitor tool (like logic analyzer or breakpoints etc.) then press 'c [press enter key]' and your program runs. This is a very fast debug cycle with PIO.
