Mac Arthur HAT compatilibity

[den200]

Hey there,

Does anyone know if BBN OS is compatible with the new Mac Arthur HAT ?

[mgrouch]

Latest BBN OS is Bookworm Raspberry based so you should check with your hardware vendor how they support at least that. Or if they have BBN OS specific instructions.

[mgrouch]

Pi settings (untested) for NMEA 2000 but something along these lines:

/boot/config.txt
...
#dtoverlay=disable-bt
#dtoverlay=w1-gpio
enable_uart=1 
dtparam=i2c_arm=on 
dtparam=spi=on
dtoverlay=mcp251xfd,oscillator=20000000,interrupt=25,spi0-1
#dtoverlay=spi-bcm2835
...


/etc/network/interfaces.d/can0
...
# physical can interfaces
allow-hotplug can0
  iface can0 can static
  bitrate 250000
  pre-up ip link set can0 type can restart-ms 100
  down /sbin/ip link set $IFACE down
  up /sbin/ifconfig $IFACE txqueuelen 10000
...

  root@roam:~# ifconfig
can0: flags=193<UP,RUNNING,NOARP>  mtu 16
        unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  txqueuelen 10  (UNSPEC)
        RX packets 3920303  bytes 31362424 (29.9 MiB)
        RX errors 0  dropped 623  overruns 0  frame 0
        TX packets 4  bytes 12 (12.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

[jsextl]

Works perfect without problems - only difference is, that BBN has a separate service for the CAN interface, so you don't have to configure /etc/network/interfaces manually.

If anybody needs detailed instructions, just let me know and I can copy&paste exact settings / configuration.

Best regards,
Jonas

[mgrouch]

Would be nice if you could post here your exact working config.

Thanks

[mgrouch]

Works perfect without problems - only difference is, that BBN has a separate service for the CAN interface, so you don't have to configure /etc/network/interfaces manually.

If anybody needs detailed instructions, just let me know and I can copy&paste exact settings / configuration.

Best regards, Jonas

Would be nice if you could post here your exact working config. And also instructions regarding service.

Thanks

[jsextl]

Sure no problem.

1. Enable driver in /boot/firmware/config.txt:

[...]
# enable CANBUS
dtoverlay=mcp251xfd,oscillator=20000000,interrupt=25,spi0-1
[...]

I put this configuration after the last "dtoverlay" statement present in the file of a fresh default installation.

2. Reboot

3. Enable can bus interface

sudo systemctl enable socketcan-interface
sudo systemctl start socketcan-interface

If everything is properly setup on the hardware side, you should receive the CANBUS traffic via:

candump can0

[mgrouch]

Relevant to the discussion (non isolated NMEA 2000)

OpenMarine/MacArthur-HAT#14

An article about ground loops and isolation

https://actisense.com/news/why-nmea-isolation-is-critical-for-your-network/

[mgrouch]

UARTs of the MacArthur hat for NMEA 0183 on BBN Marine OS

Raspberry Pi 5

NMEA 1 in/out: UART2
NMEA 2 in/out: UART4

in /boot/firmware/config.txt

dtparam=uart0=on
dtoverlay=uart2-pi5
dtoverlay=uart4-pi5

Raspberry Pi 4 and 3

NMEA 1 in/out: UART3
NMEA 2 in/out: UART5

dtoverlay=disable-bt
dtoverlay=uart3
dtoverlay=uart5

Reboot after editing /boot/firmware/config.txt

and check devices created

ls  -ltr  /dev/tty*

[free-x]

just 2 cent
RPi3 doesn't have uart3/uart5. Only uart0

[mgrouch]

Thanks for the correction