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can bus off

1. eCAN的Global interrupt中有个bus off interrupt,这是指哪种情况?怎样才会满足这个条件?

    我现在拔掉CAN通信线,然后DSP每50ms发送一个message,EPIF0、WLIF0和WDIF0都置位,CANTEC=128,。

    但始终无法置位BOIF0,且CANTEC不再增加。

2. 运行时,EPIF0、WLIF0先置位且产生中断,在我没有清除EPIF0、WLIF0的时候,即使WDIF0置位也不产生中断,这正常吗?