gotto terminal ->type

$sudo raspi-config

goto advanced options->find serial

Now over their make default login console through serial Disable

Now your application can access the serial port.

It works 100%.

Bikash panda: Ehh. Modern versions apparently add "enable_serial=0"  to /boot/config.txt so that disables the serialport altogether. You need to check config.txt if that's ends up there, if so, and you want to use the serial port for other things, then you need to change it to =1.

rew: Ya I am aware of that. But I just mentioned alternate way so that not to mess up with the text file...

No you're not aware of that.... raspi-config will DISABLE the serial port altogether by putting enable-serial=0 in the config file for you. Then you can no longer access the serial port hardware from the ARM side. As far as Linux is concerned the hardware has been unplugged. No "now your application can access it".

This is where you need to make it 'No' . Now any application running on your Raspberry Pi can Access the Serial Port

And this is  "enable_uart=0" Instead of "enable_serial=0" what u have mentioned. Please check.

And this works 100% with JAVA and Pi4J

i had disable the login shell but i dont get idea how to send the data on serial port which is present on board if you can tel me how to send or receive message through UART in Rasberry pi 3

i had disable the login shell but i dont get idea how to send the data on serial port which is present on board if you can tel me how to send or receive message through UART in Rasberry pi 3

After that you can use any programming language to access the serial port depending upon what you are comfortable with.  I have not used python but have used with JAVA with Pi4J Library.

Just google for Pi4J and that comes with a lot of descent examples.

To run java application on Pi . If you are interested to give it a try you can go through my tutorial

https://www.youtube.com/watch?v=kNvLRDpduYs

your tutorial is good but you have not send that "hello world " over serial port i want to send it over serial port could you help me with it

Ya sure....That video was not about serial port....I can help with that......But with JAVA only...

ok assist me for the java i can code in java

Ok then download The Pi4J Project - Download

and add it to your project. The downloaded zip folder contains nice examples for serial communication.

If you can wait i am working on some tutorials around Pi4j which will be online before next week...

Cool -> The Pi4J Project - Usage (Serial com over com port).

C

Ya..

i have raspberry pi 3  board so please assist me according to that  and

thank you for everything

prasadjain05 Hope you have finished with this otherwise you can check my video below for serial communication using JAVA.

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Serial Communication | JAVA | Raspberry Pi RE: how to use serial port in raspberry pi 3

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