LPC FAQsのトピックHow to detect and handle bus off? https://community.nxp.com/t5/LPC-FAQs/How-to-detect-and-handle-bus-off/m-p/590653#M152 <HTML><HEAD></HEAD><BODY><P>Bus off means that the transmit error counter (see explanation further down) has reached 256. There<BR />are many possible causes of this but it could mean that the CAN controller is misconfigured or the<BR />controller is not connected to the CAN bus. The root cause of the problem should be addressed to stop<BR />it happening again. For a misconfiguration it could be that the bit rate is incorrect.<BR />Once in bus off the CAN controller will set a flag in the status register to indicate the state has been<BR />entered and it is common that CAN controllers also trigger an interrupt.<BR />Bus off mode traditionally can only be exited by re-initializing the CAN controller, but some newer CAN<BR />controllers also allow to clear that state individually or even automatically after a certain time.</P><P></P><P></P><P><SPAN style="font-size: 11.0pt;">"FAQ contribution from Embedded Systems Academy, experts in CAN bus. For more information visit <A href="http://www.esacademy.com">www.esacademy.com</A>"</SPAN></P></BODY></HTML> Fri, 02 Sep 2016 21:52:26 GMT lpcware 2016-09-02T21:52:26Z How to detect and handle bus off? https://community.nxp.com/t5/LPC-FAQs/How-to-detect-and-handle-bus-off/m-p/590653#M152 <HTML><HEAD></HEAD><BODY><P>Bus off means that the transmit error counter (see explanation further down) has reached 256. There<BR />are many possible causes of this but it could mean that the CAN controller is misconfigured or the<BR />controller is not connected to the CAN bus. The root cause of the problem should be addressed to stop<BR />it happening again. For a misconfiguration it could be that the bit rate is incorrect.<BR />Once in bus off the CAN controller will set a flag in the status register to indicate the state has been<BR />entered and it is common that CAN controllers also trigger an interrupt.<BR />Bus off mode traditionally can only be exited by re-initializing the CAN controller, but some newer CAN<BR />controllers also allow to clear that state individually or even automatically after a certain time.</P><P></P><P></P><P><SPAN style="font-size: 11.0pt;">"FAQ contribution from Embedded Systems Academy, experts in CAN bus. For more information visit <A href="http://www.esacademy.com">www.esacademy.com</A>"</SPAN></P></BODY></HTML> Fri, 02 Sep 2016 21:52:26 GMT https://community.nxp.com/t5/LPC-FAQs/How-to-detect-and-handle-bus-off/m-p/590653#M152 lpcware 2016-09-02T21:52:26Z