Add example for picotool reset

[JohnAZoidberg]

No description provided.

[will-v-pi]

These defines are already set to 1 by default, so I'm not sure how this example differs from any of the other examples which use pico_enable_stdio_usb (eg hello_usb, hello_anything, hello_universal)? All of those examples already have support for picotool reset by default

[peterharperuk]

It's useful to know how to add support for the reset interface if you have your own usb cdc setup? usb/device/dev_multi_cdc tries to do that but I seem to recall it doesn't quite work.

[will-v-pi]

I've just had a quick hack and got it working with dev_multi_cdc, but it'll need a few SDK changes too to allow using the reset interface without the stdio_usb default descriptors - will try more in a week or so

[JohnAZoidberg]

All of those examples already have support for picotool reset by default

Oh, I didn't realize that. I tried a long time with the usb examples and also those from tinyusb but the defines never worked on those. So once I finally tried them on the hello example it did work.
Then instead of my code changes, it might be useful to keep the readme changes and explicitly document that the hello example does indeed support the reset protocol.

I've just had a quick hack and got it working with dev_multi_cdc, but it'll need a few SDK changes too to allow using the reset interface without the stdio_usb default descriptors - will try more in a week or so

Cool, thanks!

[mtfurlan]

@will-v-pi any luck on getting dev_multi_cdc working with picotool reset?

[will-v-pi]

Yes, see #694 (it requires SDK changes as well)