Adding UART0 to hal.stream for user i/o on SKR pico?

[letrow]

The BTT SKR Pico comes with a (short) cable to connect the output of the Pico's UART0 port to a Raspberry Pi host. The host - perhaps running a sender app - could then be piggybacked on the SKR board. BTT does something like that with Klipper.
The current build of grblHAL for SKR Pico only provides hal.stream on the USB serial port, which is fine of course. But would it be an idea to also have the user i/o on the uart0 - or make it configurable in the webbuilder or elsewhere?

[terjeio]

You mean MPG mode where a second stream can take over control?
If so it is available, but could be made more flexible in the Web Builder if more than one serial port is available.

[letrow]

Yes, right; and what do I do when I want to compile this myself (in docker)? Which #defines etc to set? BTW is there documentation for developers available? So far I have been browsing the sources but I find it hard to get an overview.

[letrow]

I figured it out already: in my_machine.h
#define MPG_ENABLE 2
#define KEYPAD_ENABLE 2
did the job. Only the seconds terminal does not seem to accept Return keystrokes, It works nicely on the ? and other singe keystroke commands however. Could you give me a hint where to look in order to make the second terminal fully operational so I could e.g. also send $ commands etc?

[terjeio]

Yes, right; and what do I do when I want to compile this myself (in docker)?

Enable MPG mode.

BTW is there documentation for developers available?

I have some here. My longer term plan is to add doxygen comments to the sources and write a book for developers. Not sure when I am able to do that though, I do not earn enough from the project to hire people to help me.

[terjeio]

Could you give me a hint where to look in order to make the second terminal fully operational so I could e.g. also send $ commands etc?

Here again?

You have to send a 0x8B character to claim full control. grblHAL does not allow mingling input from different streams, only one can be in full control at any time.
BTW the keypad plugin is no longer required - I'll have to update the Wiki page.

[letrow]

Works! Great and thanks again!