- Ubuntu Arduino Serial Monitor Not Working
- Serial Terminal Ubuntu
- Ubuntu Serial Monitor Screen
- Cpu Monitor Ubuntu
Serial Monitor is one of the tools in Arduino IDE. It is used for two purposes: Arduino → PC: Receives data from Arduino and display data on screen. This is usually used for debugging and monitoring; PC → Arduino: Sends data (command) from PC to Arduino. Data is exchanged between Serial Monitor and Arduino via USB cable, which is also used. To monitor the input I have tried using (Coolterm & GTKTerm), assuming an issue with the driver I have referred and tried updating the DTR line as the solutions suggested in the following stack overflow resources Reference 1,Reference 2,Reference 3. I have tied the same on the ubuntu based computer too but the issue remain the same. Tips to Set Up Minicom: The Best Serial Terminal Monitor in Ubuntu Himadri Subrah Saha No Comments If you are working with embedded software system, you should know what Minicom is and what we need to do with the Minicom.
This article will describe changing GRUB2 and Linux to serial console.
Ubuntu Arduino Serial Monitor Not Working
This is not for desktop environment but embedded system and virtual machine environment.
Table of Contents
- 4. Execution result
Serial Terminal Ubuntu
1 Why using serial console
The serial console is helpful for CUI environment.
- An embedded system which has no monitor display like router can be operated by serial console with RS232C.
- A virtual machine like KVM + libvirt can be operated by serial console with CUI tools like virsh.
2 /etc/default/grub
Change /etc/default/grub as below.
- Change GRUB terminal to console and ttyS0. This will provide one GRUB to a monitor display and serial console.
- Remove hidden parameter for avoiding 'no video mode activated' error. And change GRUB timeout from 10 seconds to 1 second.
- Change linux kernel console to tty1 and ttyS0. This setting will be taken over to userland, and there will be two login prompt for tty1 and ttyS0.
3 grub-mkconfig
Update /boot/grub/grub.cfg with grub-mkconfig.
Reboot Ubuntu 16.04.
Ubuntu Serial Monitor Screen
4 Execution result
GRUB to monitor display is as below.
GRUB to serial console is as below.
This article used 'sudo virsh console <vmname>' for connecting serial console.
Login prompt to monitor display is as below.
tty1 is displayed with press Ctrl + Alt + F1.
Login prompt to serial console is as below.
4.1 Single user mode / Recovery mode
- When running single user mode, there will be two root prompt for tty1 and ttyS0.
- When running recovery mode, there will be one root prompt for ttyS0. If you want to switch prompt to tty1, you need to move 'console=ttyS0,115200' to GRUB_CMDLINE_LINUX_DEFAULT in /etc/default/grub because recovery mode does not user GRUB_CMDLINE_LINUX_DEFAULT.
- When running single user mode or recovery mode, root prompt for ttyS0 will be corrupted, e.g. noecho. Please append 'stty sane' to root.bashrc as below.
Cpu Monitor Ubuntu
A root prompt for ttyS0 with using 'stty sane' is as below.