In this tutorial i am going to use C language to program the Serial port,compiler used is GCC. Īnother place where you can see the attached serial devices is the /dev/serial/by-id folder. You can see that FTDI based USB to Serial Converter is attached to ttyUSB0.Now you can use the ttyUSB0 to communicate with your serial converter. Now to check for any USB to serial converter use dmesg | grep tty command. Now if you dont have any hardware serial ports ( like in my case ) the command will not print anything,like this. It means that ttyS0 is your hardware serial port connected to your computer. Now you can see a large number of serial ports listed in the /dev directory like ttyS28,ttyS23 etc.Now to identify which of the ttyS* corrosponds to your hardware serial port run the following command on the terminal.
In Linux the hardware components like serial ports are treated like files and are grouped together in the /dev folder in the file system.if you navigate into the /dev folder and list the files using ls command you can see the files corresponding to various hardware devices. USB to Serial Converter based serial ports are usually named as ttyUSB* where * can be 1,2,3. etc.They are similar to COM1,COM2 etc under a windows box. Traditional hardware serial ports under Linux are named as ttyS* where * can be 1,2,3.
One problem with the traditional serial ports is that they are now legacy hardware and are being phased out by the PC manufacturers and most laptops have USB ports only,this problem can be easily solved by using a variety of USB to Serial Converters available in the market,eg USB2SERIAL V2.0.
In order to run the application.This is a tutorial on how to program the Serial Ports on your Linux box.Serial Ports are nice little interfaces on the PC which helps you to interface your embedded system projects using a minimum number of wires.In this tutorial we will write a small program that will send and receive ASCII characters to a microcontroller development board. very important WITHOUT quotes!! on the env options.ĭescription=Control headless soffice instance %iĮxecStart=/usr/lib64/libreoffice/program/soffice.bin -env:SingleAppInstance=false -env:UserInstallation=file:///tmp/LibO_Process%i -accept=socket,host=localhost,port=%i urp -headless -norestore usr/lib64/libreoffice/program/soffice.bin -env:SingleAppInstance="false" -env:UserInstallation="file:///tmp/LibO_Process8101" -accept="socket,host=localhost,port=8101 urp " -headless -norestore
Start by testing the exec start command in the terminal. In this example I will show you how to start 3 instances each with there own PID and port. This can be useful to distribute the load of big convert batches for example. In order to run multiple instances of LibreOffice. If you are running on an os that ships with systemd, the trick is to make a template unit file (systemd file).