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急!2812 多节点can通讯收发问题!!

DSP2812作为主站点与三个驱动器从站进行CAN通讯,DSP主站ID为01,三个从站会同时向主站发送数据,而我们DSP接收的数据貌似是被覆盖掉了,只接收到一个从站的数据。
所以我们想请问如何配置can的各个寄存器,能保证接收完整信息。能否多设置几个接收邮箱,一对一接收从站信息。坐等回复,谢谢!!