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F2812,CAN模块BufOff判断



各位好:

    有个问题请教一下:正在用F2812的CAN做CANOPEN ,做了CAN的BusOff检测,实验中发现,CAN一旦死机, ECanaRegs.CANES.bit.BO不是'1',而是'0‘。

ECanaRegs.CANES.bit.CCE变成‘1’。

求教一下:应该判读哪些寄存器,来判断CAN的BusOff状态? 谢谢