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修改CAN例程，使得CAN与上位机能够正常通信。现在问题是，程序中设置邮箱ID为ECanbMboxes.MBOX1.MSGID.all = 0x8A104080;，上位机发送时，只有ID号完全相同的CAN数据帧才会被接收，所以想问一下，如何设置寄存器，使得DSP能够接收所有的CAN信息?
CAN的每个邮箱都有一个mask寄存器，可以用来屏蔽指定的MSGID位，所有MSGID位都屏蔽掉后就能接收所有CAN信息。
