Serial Output from Linux

Hello,
I am a complete Linux noob, any help appreciated.
GOAL: Output messages from Linux to serial . I want "Hello World" to come out Serial.
The UDOO is connected to my PC and I see the boot up serial output, and I can log in to SSH over serial.

The guides have conflicting information and are confusing. How do I accomplish this simple task? Thanks!


Method One
udoo-test-communication-sketch-ino-t387.html
Result One

Code:

root@volumio:~# sudo ln -sf /dev/ttymxc3 /dev/ttyS0
root@volumio:~# python
Python 2.7.3 (default, Mar 14 2014, 17:55:54)
[GCC 4.6.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import serial
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>

Method Two
http://udoo.org/download/files/Document ... 8_2013.pdf
Result Two

Code:

root@volumio:~# stty -F /dev/ttymxc3 cs8 115200
root@volumio:~# echo message > /dev/ttymxc3

Method Three
http://www.udoo.org/ProjectsAndTutorial ... ial-cable/
Result Three

Code:

root@volumio:~# sudo chmod 666 /dev/ttyUSB0
root@volumio:~# sudo minicom -w
minicom: cannot open /dev/ttyUSB0: No such device

 

Anyone? Thanks

 

I don't understand, are you connected through the serial cable or a network connection?
If you are using the usb cable then you are probably using a serial comunication program like minicom.
If you are using a network connection then SSH is probably involved.

Method one:
This example is used to send data to arduino through the serial port. You need an arduino sketch to read the data.
Anyway, to avod the error you need the pyton library pyserial, try installing with:

Code:

sudo apt-get install python-serial

Method two:
This is used to send data to arduino through the serial port. You need an arduino sketch to read the data.

Method three:
This is meant to be used on a PC to connect to the UDOO.

This is a solution i found to send a message from Udoo to PC using the USB cable (serial debug connection)
The serial connections of Udoo are usually in the form of ttymxc<something> so i tested some devices in "/dev" and found "ttymxc1" to be the one related to the USB serial debuging connection. You need to be root to use it. The commands i used in the Udoo are:

Code:

su
echo "ciao" > /dev/ttymxc1

And then you will see the string "ciao" in the PC console

 

Thanks!

My goal is to send data FROM UDOO TO PC VIA SERIAL.
It worked! Thanks!

How would I go about writing a script that automatically sent a message over serial every second?