https://community.nxp.com/t5/Kinetis-Microcontrollers/the-USB-endpoint-buffer-maybe-exausted-in-KHCI-driver/m-p/1344884#M61540 <P>hello NXP</P><P>We encountered a problem when using the KHCI driver (KSDK 1.3) in our application</P><P>When Kinetis K81 is connected to an Android device via USB, the endpoint buffer (usb_dev_ptr-&gt;xd_entries) will be exhausted when the Android SDK calls the following functions to close and open the HCI connection:</P><OL><LI>android.hardware.usb.UsbDeviceConnection.releaseInterface(UsbInterface intf)</LI><LI>android.hardware.usb.UsbDeviceConnection.close()</LI><LI><DIV><DIV><SPAN>Context.</SPAN><SPAN>getSystemService</SPAN><SPAN>(Context.USB_SERVICE)</SPAN></DIV></DIV></LI></OL><P>becuase&nbsp;usb_dci_khci_init_xd() is called only when a <SPAN>USBRST interrupt (K81 reset, USB plug on/plug off) occurs, if the USB host continues to obtain device descriptors, xd_entries may be exhausted</SPAN></P><P><SPAN>how can I release the xd_entries buffer correctly if USB device didn't be plug off and on on during the life cycle?</SPAN></P><P>&nbsp;</P><P><SPAN>Thank you</SPAN></P><P><SPAN>Robin</SPAN></P> Thu, 23 Sep 2021 08:37:42 GMT robinliao 2021-09-23T08:37:42Z https://community.nxp.com/t5/Kinetis-Microcontrollers/the-USB-endpoint-buffer-maybe-exausted-in-KHCI-driver/m-p/1344884#M61540 <P>hello NXP</P><P>We encountered a problem when using the KHCI driver (KSDK 1.3) in our application</P><P>When Kinetis K81 is connected to an Android device via USB, the endpoint buffer (usb_dev_ptr-&gt;xd_entries) will be exhausted when the Android SDK calls the following functions to close and open the HCI connection:</P><OL><LI>android.hardware.usb.UsbDeviceConnection.releaseInterface(UsbInterface intf)</LI><LI>android.hardware.usb.UsbDeviceConnection.close()</LI><LI><DIV><DIV><SPAN>Context.</SPAN><SPAN>getSystemService</SPAN><SPAN>(Context.USB_SERVICE)</SPAN></DIV></DIV></LI></OL><P>becuase&nbsp;usb_dci_khci_init_xd() is called only when a <SPAN>USBRST interrupt (K81 reset, USB plug on/plug off) occurs, if the USB host continues to obtain device descriptors, xd_entries may be exhausted</SPAN></P><P><SPAN>how can I release the xd_entries buffer correctly if USB device didn't be plug off and on on during the life cycle?</SPAN></P><P>&nbsp;</P><P><SPAN>Thank you</SPAN></P><P><SPAN>Robin</SPAN></P> Thu, 23 Sep 2021 08:37:42 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/the-USB-endpoint-buffer-maybe-exausted-in-KHCI-driver/m-p/1344884#M61540 robinliao 2021-09-23T08:37:42Z https://community.nxp.com/t5/Kinetis-Microcontrollers/the-USB-endpoint-buffer-maybe-exausted-in-KHCI-driver/m-p/1348616#M61601 <P>I recommend that you changed to MCUExpresso and test the SDK for that</P> <P>&nbsp;</P> Wed, 29 Sep 2021 18:07:09 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/the-USB-endpoint-buffer-maybe-exausted-in-KHCI-driver/m-p/1348616#M61601 vicentegomez 2021-09-29T18:07:09Z