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如果CAN 能信出现了BUS OFF 按如下流程即可清除BUS OFF标志,重新开始通信
CAN0->CON = (CAN_CON_INIT_Msk | CAN_CON_CCE_Msk);
CAN0->CON &= (~(CAN_CON_INIT_Msk | CAN_CON_CCE_Msk));
while(CAN0->CON & CAN_CON_INIT_Msk);