![]() Sudo cp -pr /boot/firmware/config.txt /boot/firmware/config.txt-origĮdit /boot/firmware/config.txt to comment out the enable_uart=1 like below, #enable_uart=1 Here is what I did:īack up the original config.txt and cmdline.txt files sudo cp -pr /boot/firmware/cmdline.txt /boot/firmware/cmdline.txt-orig I have a setup using both Bluetooth/hci0 and the miniUART/ttyS0 at the same time with Ubuntu 20.04 (Ubuntu 5.4.0-1034.37-raspi 5.4.101) 64bit on Raspberry Pi 4 Model B Rev 1.1 (4G memory). The first uses the full hardware UART, the second uses a "mini-UART" implementation that seems to not work so well under Ubuntu 20.04 (at least with the roboclaw, in my hardware setup. Note that after this set up, you need to use ttyAMA0 (or alias serial1), not ttyS0. (Optional) Feel free to test with this script:.Add newline dtoverlay=disable-bt to /boot/firmware/config.txt (I put it right under the cmdline=cmdline.txt line).Delete substring console=serial0,115200 from /boot/firmware/cmdline.txt.Add user to tty group: sudo adduser ubuntu tty.Reload udev rules: sudo udevadm control -reload-rules & sudo udevadm trigger.put below content in new file /etc/udev/rules.d/les KERNEL="ttyS0", SYMLINK+="serial0" GROUP="tty" MODE="0660".Disable systemctl stop systemctl disable systemctl mask Setup udev rules.That said, here's how I did it (note that this is cliffsnotes of this procedure): Reader beware.Ĭonfirmed this works with 5 roboclaw motor controllers on the same serial bus. Unfortunately, I'm not sure at this point how to get there without disabling Bluetooth. I was able to resolve it, though I had to disable Bluetooth to get there. I had a bunch of trouble talking to a roboclaw motor on an rpi4 (model B) under Ubuntu 20.04 (64 bit). What should I change manually in them that RASPI-CONFIG would do via script? I presume that are other Raspberry Pi 4 owners who intend to use the serial port and there's got to be a way to do what RASPI-CONFIG is trying to do on Ubuntu. Sed: can't read /boot/cmdline.txt: No such file or directory Grep: /boot/cmdline.txt: No such file or directory I got an updated install script (same github link above) and now have successfully installed RASPI-CONFIG, however while I can run it the directory structure on the RPi4 w/ Ubuntu 20.04 is different enough that it fails to find the config files it tries to change. ![]() Tried to change baud, parity, flow control settings with no effect.Īlso have a simple serial test python which also fails to send/receive over serial at /dev/ttyS0 whether I run with sudo or without. ![]() No verification of communication with serial. Second when I run sudo minicom -b 115200 -o -D /dev/ttyS0 (with loopback in place - verified correctly installed) Lrwxrwxrwx 1 root root 7 Apr 1 11:23 /dev/serial1 -> ttyAMA0 ![]() How do I do that? $ ls -l /dev/ttySĬrw-rw- 1 root dialout 4, 64 Jun 27 12:32 /dev/ttyS0 So doesn't look like I disabled the console. rial: ttyAMA0 at MMIO 0xfe201000 (irq = 29, base_baud = 0) is a PL011 rev2 ![]() That led me to /boot/firmware directory where I found config.txt, cmdline.txt etc. I need to use Bluetooth and also basic serial communication over Pin 8,10 to communicate with a Roboclaw motor controller.ĭid install RASPI-CONFIG on Ubuntu using script at but even though it installed successfully it loads with improper boot configuration error. I have loopback wire installed on Pin 8,10. I have Ubuntu 20.04 (32 bit) installed on RPI4 (4GB). ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |