3 ms·
The packet size is a major one. The lack of larger packets leads to nonsense like the "freshness manager" in things like AUTOSAR's SecOC, or the addressing sche
by AlotOfReading 2y ago
The packet size is a major one. The lack of larger packets leads to nonsense like the "freshness manager" in things like AUTOSAR's SecOC, or the addressing scheme. Every subsequent CAN extension has tried to rectify both of these in different ways and inevitably failed, which leads to the next layer up the networking stack reinventing the wheel badly. Eventually you end up with UDS.
- the__alchemist 2y agoYea, that 64-byte frame size. In practice, I've always seen it abstracted away into a layer on top, but if you're working low-level (e.g. implementing that layer), it's a pain. So, a given packet may be represented by multiple frames.
- rjsw 2y agoI hold a patent on the design of a hardware offload engine to hide the handling of multiple frames from a main CPU.