"Disconnected from Serial Port" while running Hello World on M5Stack (UIFlow2, Ubuntu)

AlphaBrabo

Issue Summary

I'm trying to run a simple "Hello World" program on my M5Stack Core using UIFlow2 on Ubuntu 22.04, but I keep experiencing an issue where the serial connection drops unexpectedly. Here’s what happens when clicking Run or Download the program to the device: a pop up appears, the device connects successfully and logs RAM information:

heap RAM free: 55760
heap RAM alloc: 45296
heap RAM free: 55760
heap RAM alloc: 45296
...

After a few seconds, I get "Disconnected from Serial Port", and the device is no longer accessible.

My device shows Public, the device mac, the associated user account, a QR Code ...

What I've Tried So Far

Checked USB connection

Used a high-quality data USB cable.
Switched between USB 2.0 and USB 3.0 ports.
Tried a different cable and another PC.

Verified Serial Port availability

After disconnection, I ran ls /dev/ttyACM*

Before and After disconnection: /dev/ttyACM0 is listed. I can't see if it disconnects when I upload the code

Disabled ModemManager (Ubuntu)

sudo systemctl stop ModemManager

Flashed the latest UIFlow2 firmware using M5Burner

Used M5Burner to install the latest version of UIFlow2.
Issue persists even after flashing and rebooting.

Tried a minimal script in UIFlow2

from m5stack import *
from m5ui import *
from uiflow import *

lcd.clear()
lcd.print("Hello World", 10, 10)

The screen does not display "Hello World" before disconnection occurs.

Questions

Why does my M5Stack disconnect from the serial port after a few seconds?
Is this a firmware issue or a hardware problem?
Could this be related to power management settings or a driver issue on Linux?

Any help would be greatly appreciated! Thanks in advance. 😊

schnauzer

Hi.

I have the same problem. My Mint Linux pops up the terminal; says it connected; says it disconnected.

Have you made any progress solving this problem?

Zverik

Yup, same. Got my M5Stack Basic 2.7 today, burned UIFlow2, but when I try to open a console, or run a program, it shows some log about connecting and disconnecting, and does nothing:

Connected to Serial Port!
4592
heap RAM free: 86704
heap RAM alloc: 2heap RAM free: 86704
heap RAM alloc: 24592
heap RAM free: 86704
heap RAM alloc: 24592
heap RAM free: 86704
heap RAM alloc: 24592
heap RAM free: 86704
heap RAM alloc: 24592
heap RAM free: 86704
heap RAM alloc: 24592
heap RAM free: 86704
heap RAM 4592
heap RAM free: 86704
heap RAM alloc: 24592

Disconnected from Serial Port

kuriko

@Zverik
have you flashed the correct firmware?