How to set the size of the Linux serial port buffer?
In Linux, the size of the serial buffer can be adjusted by modifying the system’s serial driver. The specific method of adjustment depends on the type of serial driver used by the system.
In general, the setup can be done through the following steps:
- Open the terminal and log in to the system with superuser or root permissions.
- The configuration file for serial devices
- The file 50-serial.rules located in the /etc/udev/rules.d directory.
- size of the buffer
- size of the first in, first out buffer
- Adjust the corresponding parameter values to set the size of the serial buffer. Generally, the parameter values can be set in bytes, for example, setting it to 1024 represents a buffer size of 1KB.
- Save the changes and close the configuration file.
- Restart the system or reload the serial port driver to apply the settings.
It is important to note that different systems and serial port drivers may have different methods and parameter names for settings. Therefore, the specific setting steps may vary. It is recommended to refer to the relevant operating system documentation or serial port driver documentation to obtain accurate setting methods and parameter names.
Additionally, if you only need to temporarily adjust the size of the serial port buffer, you can also use command-line tools such as stty to make the settings. For instance, you can use the following command to set the serial port buffer size to 1024 bytes:
stty -F /dev/ttyS0 -iexten -echo -echoe -echok -icrnl -ixon -opost -isig -icanon -imaxbel -brkint -tostop -inlcr -kill -onlcr -iexten -isig -icanon min 1 time 1
The /dev/ttyS0 is the filename of the serial port device you want to set, with min 1 and time 1 indicating a buffer size of 1 byte. You can adjust these parameter values as needed.
In summary, by altering the serial port driver configuration file or using command line tools, you can adjust the serial port buffer size in Linux.
