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TMS570 CAN如何配置

我使能了CAN1,并设置邮箱1发送,邮箱2接收,并配置相关中断。使用loopback模式可以正常接收到数据。然后注释掉loopback,用万用表测量CAN1引脚,结果显示TX和RX一直保持3.3V电压,这很不正常。请帮我检查下哪里没有配置正确。