Problem with USB serial on Teensy 3.6

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eliasrobs

New member
Hey everyone,

it's my first post and I already have a problem for you ;P

I'm trying to get serial over usb to work on a Teensy 3.6 but it has a strange issue: the pc receives the first few messages and then the serial monitor just freezes. Some time ago it was doing that on cutecom but it was working in the Arduino serial monitor but now the problem appears everywhere.
I'm on Arduino 1.8.10 and Teensyduino 1.49 and the sketch is the following:
Code:
unsigned int count=0;

void setup() {                
  Serial.begin(57600);
  delay(100);
}

void loop()                     
{
  count = count + 1;
  Serial.print("Hello World ");
  Serial.println(count);
  delay(100);
}

teensy_serial_problem.png

I just found old threads about similar problems but they should all be fixed in the current version so I hope there is someone who can help me, thanks!
 
Is this Linux?

ModemManager tends to do this on Linux. Ubuntu (and maybe others) changed ModemManager's default filter policy months ago, exposing a bug where it no longer respected the udev rules and started interfering with Teensy and Arduino and other boards.

We updated the udev rules file, but many people still have the old one without "ID_MM_PORT_IGNORE".

https://www.pjrc.com/teensy/49-teensy.rules
 
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