Wait for Ctrl-D to finish to prevent filesystem reformat upon following Ctrl-C

[connorcl]

This PR contains a small change to ensure that when rebooting a Pico board with Ctrl-D before running a Python file, the extension waits until the board has rebooted before issuing a subsequent Ctrl-C. This prevents the filesystem on the Pico board being erased in response to its boot process being interrupted, as per this issue and this PR (both in the MicroPython project).

This addresses this issue in the Pico-W-Go extension.

Currently, this change has been tested on Ubuntu 22.04 and VS code 1.75.1.

[DavidEGrayson]

Hi, I'm not a user of this project, but I'd just like to chime in that in my experience with MicroPython on the Pico, it is not necessary to send Ctrl+C at all after doing a soft reboot, as there will not be any Python code executing at that time. (main.py does not run after doing a soft reboot sequence of Ctrl+C Ctrl+A Ctrl+D.)

[paulober]

Thanks for taking the time to fix this issue. Should also fix #50, am I wrong?

[connorcl]

Thanks for taking the time to fix this issue. Should also fix #50, am I wrong?

Yes I think you're right, it does look like that issue refers to the same problem

[paulober]

@DavidEGrayson main.py and boot.py get indeed executed after a soft-reset. See documentation/forum...

[paulober]

Fixes #46, #50

[DavidEGrayson]

I was just testing it today, and the soft reboot runs main.py if you do it from the interactive/friendly REPL with the >>> prompt, but not if you do it from the raw REPL with the > prompt. In the sequence I gave (Ctrl+C Ctrl+A Ctrl+D), the Ctrl+A puts you into raw REPL mode.

Looks like this is by design:

https://github.com/micropython/micropython/blob/2bcd88d/ports/rp2/main.c#L189

[paulober]

@DavidEGrayson Sorry missed that one. But the extension does not go into raw REPL mode before making a soft-reboot. But good to know so maybe putting it in raw REPL before whould remove some komplexety