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Update CANBUS.md for Bookworm #6798

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Update CANBUS.md for Bookworm #6798

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Update CANBUS.md for Bookworm
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27 changes: 26 additions & 1 deletion docs/CANBUS.md
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Expand Up @@ -25,7 +25,10 @@ mode") or that run the
[candlelight firmware](https://github.com/candle-usb/candleLight_fw).

It is also necessary to configure the host operating system to use the
adapter. This is typically done by creating a new file named
adapter.

If you are using a Debian Bullseye based system using ifupdown, this
is typically done by creating a new file named
`/etc/network/interfaces.d/can0` with the following contents:
```
allow-hotplug can0
Expand All @@ -34,6 +37,28 @@ iface can0 can static
up ip link set $IFACE txqueuelen 128
```

In newer Debian Bookworm installations it is necessary to use systemd-networkd,
two files need to be created, one to define the interface and another to
set the txqueuelen, these are:
`/etc/systemd/network/80-can0.network` with the contents:
```
[Match]
Name=can*

[CAN]
BitRate=1M
```
and `/etc/systemd/network/80-can0.link` with the contents:
```
[Match]
OriginalName=can0

[Link]
TransmitQueueLength=128
```
then enable the service with `sudo systemctl enable systemd-networkd --now`


## Terminating Resistors

A CAN bus should have two 120 ohm resistors between the CANH and CANL
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