entable CAN bus

[Antillanca]

I have tried to activate CANBUS using "armbian-config", but it does not appear in /dev/, neither with i2c

[Biohazard777]

@Antillanca you can check out this thread:

Or continue reading here, i'll explain it.
You need to change a few parameters in the boot environment:
sudo armbian-config -> System -> Bootenv
or you can edit the /boot/armbianEnv.txt directly.

Once you are there you need to change the overlay_prefix to:

overlay_prefix=rockchip-rk3588-opi5

Then you need to find the names of overlays, you can get them by running the following in your terminal:

ls -l /boot/dtb/rockchip/overlay

Scroll down and you will see:

So if you want CAN bus and i2c then your Bootenv overlays should look like this:

overlay_prefix=rockchip-rk3588-opi5
overlays=can1-m1 can2-m1 i2c1-m2 i2c1-m4 i2c3-m0 i2c5-m3

Restart your OPi5 for changes to take effect.

If you need wiringPI:

Spoiler

you can currently get it from: https://github.com/orangepi-xunlong/wiringOP/tree/next
(master still doesn't have support for OPi5, next branch does hence why the link to "next")
ReadME doesn't have "gpio read all" for OPi5 so here you go:

I have not personally tried CAN bus but it should work, I have tested i2c-1 and it works properly.

[john antillanca]

@Biohazard777, I have not had problems in the configuration of I2C and SPI in the last version of Armbian, but CAN still does not work. If someone could try enabling it and reviewing the /dev/ directory, it would be very useful, regards.

[terranx]

I've been using CAN on mine for a while, it's pretty solid. Though I made my own overlay (I'm still running a testing image which doesn't seem to have come with the can overlays)

 

For the can1-m1 pins:

 

/dts-v1/;
/plugin/;
/ {
        fragment@0 {
                target = <&can1>;

                __overlay__ {
                        status = "okay";
                        pinctrl-0 = <&can1m1_pins>;
                        assigned-clock-rates = <0x1dcd6500>;
                };
        };
};

 

(note I increased the clockrate to 500MHz there, the default is 200MHz. Dunno if there's any harm, but I've been running like that for a few months without issue)

Edited March 20, 2023 by terranx

[john antillanca]

@terranx, excuse my ignorance, but how do you make a custom overlay?

 

'dmesg | grep can' command returns the following error:

rockchip_canfd fea60000.can can0: rockchip_canfd_get_berr_counter RX_ERR_CNT=0x00000000, TX_ERR_CNT=0x00000000

Edited March 20, 2023 by john antillanca

[terranx]

Based on your dmesg, sounds like your bus is enabled

 

 

[john antillanca]

@terranx 'ls /dev' command returns:

 

 

[terranx]

CAN won't show up in /dev. You'll need to lookup how to setup socketcan stuff. But if you're seeing those dmesg messages, the actual bus is enabled. Annoyingly it does flood dmesg with those messages

 

 

 

Edited March 20, 2023 by terranx

[john antillanca]

@terranx  , You are right, I don't know where I got the idea that the device would have to appear in the /dev directory, it helped me to see the command to show the CAN connection, I needed to have it working to start learning, thank you very much.