can-bus - Does Vehicle Spy software give visibility to CAN bus stuffed bits? If not, how can easily we see the stuffed bits?

Question

I'm learning about bit stuffing in CAN bus messages. We're using Vehicle Spy software to extract the arbitration ids, data values, etc.

q1: Does Vehicle Spy give a tally of stuffed bits in each message? If so how do I see this?

q2: If not, then what's the easiest way to compute the number of stuffed bits in a message from the Vehicle Spy output? Will simply converting each column from hex to bits and then searching for 5-length strings of 1s/0s work work? Is there a better way?

Answer 1

Vehicle Spy 给我发了电子邮件，说他们目前不支持这个（看不到填充位计数）。

我可以尝试的一种选择是计算每条消息的位数。所有 CAN 消息都是固定长度的，除了 (a) 数据有效负载，其长度记录在消息的 DLC 部分，和 (b) IF（结束位）未填充，但在错误激活时为 3 位模式，11 为被动错误。

假设您可以看到 DLC 的总比特长度，并且知道模式，您可以看到填充了多少。