BTT Octopus Max ESP Serial

[cr59cummins]

I have a BTT Octopus Max EZ that has been running Marlin. There is an esp8266 and using marlins #define SERIAL_PORT_2 7 at baud rate 250000. The esp is my gcode sender so it needs to act the same as the usbC port. I have grblHal running on the board and can talk to it with usb C. Compiled firmware with PlatformIO. I changed the esp to 115200 for grblHal but it doesn't matter which serial port I pick, I can't get any communication between the stm32 and the esp with grblHal.

As a side note, when installing firmware built with the web builder or with PlatformIO, I can talk to grbl and unlock/ send gcode but when I send it a '?' it doesn't respond with anything.

[terjeio]

it doesn't matter which serial port I pick

How did you pick it? You have to change USB_SERIAL_CDC to 0 in my_machine.h and possibly add a definition for SERIAL_STREAM for the port to use.

when I send it a '?' it doesn't respond with anything.

This is odd. Is it the same for other real time commands like feed hold (!).

[cr59cummins]

I don't have motors connected but if I send M6 it waits until it gets ~ and then continues.

[cr59cummins]

I expected Serial port definitions to work like marlin where each one can send gcode. I was able to send commands over usb and from the esp with marlin. In the boards/btt_octopus_max_map.h I was changing the number for #define SERIAL_PORT. When I would send $ports over usb it would reflect the changes I made there.

I changed USB_SERIAL_CDC to 0 but I am still able to send commands over usb. Is that right?
GrblHAL 1.1f ['$' or '$HELP' for help]
8NF[PORT:0|UART1|PE8,RX|PE7,TX|115200,,,1|]
ok

[cr59cummins]

I just tested sending ? with gCode sender and it worked. Why wouldn't it work sending ? from Arduino Serial Monitor? I sent it without terminator and with to see if there was a difference.

[terjeio]

I expected Serial port definitions to work like marlin where each one can send gcode.

For safety reasons only one input stream can have full control of the machine, except real-time command characters which are let trough if originating from streams not in control. Either a physical signal or a real-time command character is used for requesting full control.

I changed USB_SERIAL_CDC to 0 but I am still able to send commands over usb. Is that right?

No. When a UART stream is the main stream its pin descriptions changes to Primary UART, use the $pins command to check.

I just tested sending ? with gCode sender and it worked. Why wouldn't it work sending ? from Arduino Serial Monitor?

I have no idea since I do not use the monitor.

[cr59cummins]

I am going back to Marlin.