Enabling and using UART

[Genmastermega]

Hello All,

I am trying to enable serial communication with the ROC-RK3328-CC (Renegade) board without any success.

The following are the main things I have done in an attempt to get the UART working and the parameters I am using:

• Using Baudrate of 1,500,000 since many pieces of documentation online state this.
• Using USB to TTL Serial Cable - Debug / Console Cable for Raspberry Pi : ID 954 : $9.95 : Adafruit Industries, Unique & fun DIY electronics and kits for the serial communicator. The page states that it can accommodate a wide variety of baud rates that are not standard such as the one that is stated above.
  -using rasbian
• went into the .dtb file to enable all uarts. The file is located in /usr/lib/linux-image-6.0.12-00858-gb98721ea4575/rockchip/rk3328-roc-cc.dtb.
• Using the debug uart pins

I have retraced my steps and I am still not able to communicate with the system using UART.

Any insight as to this problem would be much appreciated.

Thanks

[librecomputer]

First update your system. Then use the libretech-wiring-tool’s ldto command. It’s built into the images. Per libretech-wiring-tool/libre-computer/roc-rk3328-cc/dt at master · libre-computer-project/libretech-wiring-tool · GitHub, both UART 1 and UART 2 are supported.

Make sure your serial cable supports 1.5Mbps baud rate.

[Genmastermega]

When using the ldto command, the available overlays do not show a uart overlay. See picture below for the available overlays:

Any ideas why this is?

I am using the ROC-RK3328-CC (Renegade) board.

Thanks

[librecomputer]

Update your system as instructed.

[Genmastermega]

Perhaps my understanding of updating the system is not what you intended.

I am doing the following to update the system:

sudo apt-get update
sudo apt-get upgrade

I even tried reinstalling the libretech-wiring-tool pakcage from git again through:

git clone GitHub - libre-computer-project/libretech-wiring-tool
cd libretech-wiring-tool
sudo make install

I am still getting the below:

Am I updating the system in the correct way?

Thanks again

[librecomputer]

Use sudo ./ldto list instead of the system one.

[wilbertvb]

Where do I find a list of serial cables that are confirmed to support 1.5Mbps?

[librecomputer]

Libre Computer Board Debug Serial UART Connection and Setup Guide

UART serial cables provide a means to get messages and errors from the board without having a graphical interface. It is critical for the debugging of errors that occur in early boot stages and in headless systems where graphics may not be available. A graphical stack or ssh connections might crash on an error so without this means of getting messages from the hardware, figuring out what went wrong becomes a difficult trial and error problem. Thankfully, UART serial cables are widely available …