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问题已解决,主要有两步:
1、用bp_16或bp_32替换280039C MCAN头文件中的Uint 16, (保留位的Uint16要用bp32替换,之前就是这点没配好导致失败);
2、修改官方提供的cmd文件,增加对MCAN寄存器的存储空间;
目前看是正常使用的。