c - broadcast file transfer via CAN bus (CANopen?)

Question

I'm building a system consisting of many (> 100) equal nodes all connected via CAN bus. The idea is that all nodes must have the same information, any node may generate an event and will broadcast it via CAN. For those events, the 8 byte payload provided by a CAN frame are enough and a broadcast will reach all nodes on a bus, so the requirement is met.

Now I also want to distribute firmware updates (or other files) to all nodes via CAN, obviously here I need some sort of fragmentation and the 8 bytes are a bit scarce.

Someone suggested CANopen to me to save me some work, but it appears that it only supports peer-to-peer mode with SDO block transfer and no broadcast.

Is there already a protocol that supports distributing files to all CAN nodes or do I have to come up with my own?

If so, what considerations should I take?

I haven't used CAN before.

Answer 1

是的，PDO 用于处理实时数据，始终传输相同的变量，而不是流数据协议。可能您可以从从站向服务器添加反馈 PDO。我与一些节点合作过，当我想启用它们时，我会发送一个启用，然后在 PDO 中从从站到主站等待，从站说它已启用。或者您可以使用 SYNC。