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TMS470MF06607 CAN收发不正常

wei wei
Prodigy 220 points


HI Renton:

      现象是这样的。同样的代码在两块板子上做实验，A板CAN收发正常，B板CAN收发不正常。通过对B板CAN寄存器的观察发现，在发送的时候DCAN的ERRSTAT寄存器的值为0x000000E5；ERRCNT寄存器的值为0x000000F8。请问是什么地方出了问题？谢谢~~~

  • 0
    TI__Expert 4460 points

    Hi Wei,

       请参考TRM中对ERRSTAT寄存器的说明:

    [LEC = 5]

    Bit0 Error: During the transmission of a message (or acknowledge

    bit, or active error flag, or overload flag), the device wanted to send

    a dominant level (logical value ‘0’), but the monitored bus level was

    recessive. During Bus-Off recovery, this status is set each time a

    sequence of 11 recessive bits has been monitored. This enables the

    CPU to monitor the proceeding of the Bus-Off recovery sequence

    (indicating the bus is not stuck at dominant or continuously disturbed).

    [EPass, Ewarn, Boff 都为1]

    说明B板的CAN模块由于连续96次以上的被动错误而进入了Error Passive状态，并且DCAN模块进入了Bus off状态。

    请检查B板的CAN bus信号，是否被外部电路始终控制在显性电平？

    或者B板所处的总线是否始终被某个节点以高优先级ID占据？