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SN65HVD230D通信遇到问题

我用STM32F042F6P6和TI的收发芯片SN65HVD230D实现对外CAN通信,在正常模式下,STM32F042F6P6的CAN_TX有波形输出,但是SN65HVD230D的CANH和CANL输出的波形严重失真,回环测试模式下,发出数据后都能在中断里面接收到,请问有没有遇到过类似问题的朋友,麻烦提点建议,谢谢!