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TMS320F28335 CAN接收中断问题

用CAN盒调试,需要发送3次数据,才能进入CAN中断,不知道问题出在哪里。第一次第二次发送数据,CANMDL、CANMDH值不变,只有第三次发送数据,CANMDL、CANMDH值才变,请问是什么原因造成的呢