topic usb cdc virtual com problem after cable detached and re attached in Kinetis Software Development Kit https://community.nxp.com/t5/Kinetis-Software-Development-Kit/usb-cdc-virtual-com-problem-after-cable-detached-and-re-attached/m-p/764543#M7771 <HTML><HEAD></HEAD><BODY><P>Hi I was wondering if anyone else has solved this issue when using the virtual com port, this also occurs when RF noise disrupts the usb link. This is using&nbsp;<SPAN style="color: #51626f; background-color: #ffffff;">ProcessorExpert with USB virtual com port. and sdk 1.3.</SPAN></P><P></P><P><SPAN style="color: #51626f; background-color: #ffffff;">I've read in another thread&nbsp;&nbsp;</SPAN><A href="https://community.nxp.com/thread/355808">How to recover from USB errors, or how to reinitialize USB0 without a full reset?</A>&nbsp;</P><P>that toggle the usb data line pullups should cause the usb device to be re-enumerated, which appears to work fine however I'm unable to send any further data as the terminal programs hungs.</P><P></P><P>How should the usb comms be shut down cleanly and restarted?&nbsp;</P><P>It would seem the function Start_Transactions returns 0 meaning the <SPAN>re-enumeration hasn't completed successfully.</SPAN></P></BODY></HTML> Fri, 10 Nov 2017 16:38:57 GMT inorman 2017-11-10T16:38:57Z usb cdc virtual com problem after cable detached and re attached https://community.nxp.com/t5/Kinetis-Software-Development-Kit/usb-cdc-virtual-com-problem-after-cable-detached-and-re-attached/m-p/764543#M7771 <HTML><HEAD></HEAD><BODY><P>Hi I was wondering if anyone else has solved this issue when using the virtual com port, this also occurs when RF noise disrupts the usb link. This is using&nbsp;<SPAN style="color: #51626f; background-color: #ffffff;">ProcessorExpert with USB virtual com port. and sdk 1.3.</SPAN></P><P></P><P><SPAN style="color: #51626f; background-color: #ffffff;">I've read in another thread&nbsp;&nbsp;</SPAN><A href="https://community.nxp.com/thread/355808">How to recover from USB errors, or how to reinitialize USB0 without a full reset?</A>&nbsp;</P><P>that toggle the usb data line pullups should cause the usb device to be re-enumerated, which appears to work fine however I'm unable to send any further data as the terminal programs hungs.</P><P></P><P>How should the usb comms be shut down cleanly and restarted?&nbsp;</P><P>It would seem the function Start_Transactions returns 0 meaning the <SPAN>re-enumeration hasn't completed successfully.</SPAN></P></BODY></HTML> Fri, 10 Nov 2017 16:38:57 GMT https://community.nxp.com/t5/Kinetis-Software-Development-Kit/usb-cdc-virtual-com-problem-after-cable-detached-and-re-attached/m-p/764543#M7771 inorman 2017-11-10T16:38:57Z