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TMS320F280049C: CAN通讯数据已进入寄存器但无法读取或者发送

Part Number: TMS320F280049C

板子是用280049自制的板子

代码使用的是TI  28004x的can例程2,can_ex2_loopback_interrupts

如图所示,CAN数据寄存器那里有实时更新数据,但用示波器测CANH跟CANL引脚时一直为0,使用can收发器也无法接收正确的数据

请问有可能是什么问题造成的