You have the GDB console available to you at all times in the Debug Console. The documentation for that can be found here. Generally
set $<register name> = <some value>
set $r0 = 2
E.g. when I put a breakpoint here and R0 is 0:
I execute the set $r0 = 2, print the registers using i r (info registers) and advance one instruction using stepi (PIO’s register view doesn’t update otherwise… but the processor has internally set the requested value).
I then get the expect state
So it is possible using the base GDB. I aggree that a feature like an option like right-clicking and “Edit” or double-clicking the register to change the value would be great. That would be a feature-request for https://github.com/platformio/platformio-vscode-ide/issues/.
