Compiling and programming the ATSAMD51J18A

First, install the patched version of openocd. This assumes you did it successfuly and have it correctly programed in your path.

To compile the code, you can just use make. The extra targets of interest are:

• make clean to clean your environment (sometimes needed before compiling, if things changed but were not discovered)
• make program to program the binary onto the chip using openocd
• make openocd to start openocd for debugging
• make debug to use gdb to debug the chip via openocd

Programming

For make program to work, you need to have the correct openocd binary accessible in the path. If it's not the default one, change it in Makefile.

You also need to be connected to your programming tool. The configuration assumes an ATMEL ICE programmer, but you can easily change that in program.cfg and debug.cfg (if needed, might work by default).

A successful programming looks like that:

Debugging with GDB

For debug, you need to start openocd with the debug configuration. In one terminal, do

make openocd

If everything is well, this is what you should get:

and in the other, you can start the gdb session with

make debug

Type c+(ENTER) to continue the program (it halts by default).

Type (CTRL)+c to stop the program. The rest is all with gdb.