Opening USB serial REPL When Script Running

[bitninja]

I have just notice a recent issue I have been having using ampy to access a Wemos D1 Mini. It seems that with the latest build, the behavior has changed such that when an ampy command is run and the device is "busy" running a script... the opening of the serial port fails.

I believe that before, opening the port would somehow interrupt the running script, and allow the device to enter a serial REPL.

Does anybody know how MicroPython behaves under these conditions and what might have changed?

I'm running Windows 10 and compiling my own binary with the latest code.

Thanks.

[bitninja]

OK, I think I have solved my problem. I was using a custom boot.py and was not aware of this change...

https://github.com/micropython/micropython/pull/3784

Once I added the new lines...

Code: Select all

import uos, machine
uart = machine.UART(0, 115200)
uos.dupterm(uart, 1)

to my boot.py, I was able use ampy again. I'm still testing though. Any insight into what's going on would be much appreciated.