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docs: Updates to CANBUS_protocol.md 

Update the document with latest details.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Kevin O'Connor 2022-07-27 13:19:36 -04:00
parent 9e3feab0b4
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docs/CANBUS_protocol.md
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@ -38,23 +38,23 @@ with a RESP_NEED_NODEID response message.
The CMD_QUERY_UNASSIGNED message format is:
`<1-byte message_id = 0x00>`
### CMD_SET_NODEID message
### CMD_SET_KLIPPER_NODEID message
This command assigns a `canbus_nodeid` to the micro-controller with a
given `canbus_uuid`.
The CMD_SET_NODEID message format is:
The CMD_SET_KLIPPER_NODEID message format is:
`<1-byte message_id = 0x01><6-byte canbus_uuid><1-byte canbus_nodeid>`
### RESP_NEED_NODEID message
The RESP_NEED_NODEID message format is:
`<1-byte message_id = 0x20><6-byte canbus_uuid>`
`<1-byte message_id = 0x20><6-byte canbus_uuid><1-byte set_klipper_nodeid = 0x01>`
## Data Packets
A micro-controller that has been assigned a nodeid via the
CMD_SET_NODEID command can send and receive data packets.
CMD_SET_KLIPPER_NODEID command can send and receive data packets.
The packet data in messages using the node's receive CAN bus id
(`canbus_nodeid * 2 + 256`) are simply appended to a buffer, and when