can question

I am using RTX51_full,and I made a program with CAN controller(sja1000),now I have a trouble with can communiction.Except of CAN,all others seem well.When I add some code that independent of CAN operation,the CAN may cause fail,even when I change the Code Optimization level the CAN communication may get OK or fail.
Can someone give me advise
thank in advance

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