Ending a 'mpremote run' script with Ctrl-C? #17118

scruss · 2025-04-12T17:21:18Z

scruss
Apr 12, 2025
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A question from the Raspberry Pi forum: interrupt Pico code started by mpremote. The OP wishes to have Ctrl-C stop the script when mpremote is exited. There doesn't seem to be a clean way to do this.

One possible way to do this is by chaining two commands, but it's a bit ugly:

mpremote run ExceptionTest.py ; mpremote  resume soft-reset

Can mpremote be configured to exit and stop the running script on Ctrl-C?

DavesCodeMusings · 2025-04-12T18:40:03Z

DavesCodeMusings
Apr 12, 2025

The way I've been doing this is to start a REPL, then press CTRL+C. The code stops and the >>> prompt appears. Then I have to CTRL+X to get out of the REPL. A lot of manual steps, but it works.

4 replies

scruss Apr 12, 2025
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that's not the same as what mpremote run, does, though. The poster from the Raspberry Pi forum wants to start a script with mpremote run, then have it stopped when they hit Ctrl-C to exit mpremote. As it stands, mpremote exits, but the script keeps running

Josverl Apr 12, 2025
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Thanks for a nice puzzel :-)
My answer is :

mpremote run --no-follow src/bolt.py repl
using --no-follow will allow mpremote to (try to) skip right to detecting the repl >>>. and there it will pick up
Using a script except KeyboardInterrupt in the script will allow the running script to detect the Ctrl-C , and exit gracefully
at this point the script has stopped
using sys.exit(0) then provides the clue to the end user that the MCU is still in raw repl

after this you can either press CTRL-B or CTRL-] depending on what you want to do.

sys.exit(0) is not needed , but without its hint I did not understand that the boards was still in raw repl.
There is no need per-se capture KeyboardInterrupt, but together with sys.exit it helps an user to understand what is happening.

So now there are a few options:

Ctrl-] - exit mpremote - script keeps running
Ctrl-C, Ctrl-] - Stop script - exit mpremote
Ctrl-C, Ctrl-B , stop script , switch to normal repl and can check state on the MCU

Just a loop
script is stopped , but MCU appears to not respond ( raw repl)

(.venv) PS D:\mypython\!-stubtestprojects\dummy> mpremote run --no-follow src/bolt.py repl
Connected to MicroPython at COM10
Use Ctrl-] or Ctrl-x to exit this shell
running 0
running 1
<snip>
running 11
running 12
Traceback (most recent call last):
  File "<stdin>", line 17, in <module>
KeyboardInterrupt:
>

with exception handling
script stops, and user can understand the state and what to do

> mpremote run --no-follow src/bolt.py repl
Connected to MicroPython at COM10
Use Ctrl-] or Ctrl-x to exit this shell
running 0
running 1
running 2
running 3
<snip>
running 15
running 16
running 17
running 18
running 19
KeyboardInterrupt caught, exiting ...
MPY: soft reboot
raw REPL; CTRL-B to exit
>
# after CTRL-B 
MicroPython v1.24.1 on 2024-11-29; Raspberry Pi Pico with RP2040
Type "help()" for more information.
>>>

bolt.py

Josverl Apr 12, 2025
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I tried to reply on the RPI forum - but they don't trust me yet 🤓

scruss Apr 12, 2025
Author Sponsor

I tried to reply on the RPI forum - but they don't trust me yet 🤓

They let you in, and your answer is up: interrupt Pico code started by mpremote - Raspberry Pi Forums

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Ending a 'mpremote run' script with Ctrl-C? #17118

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