topic Re: uframeInterval in USB_HostEhciOpenInterrupt in i.MX RT Crossover MCUs https://community.nxp.com/t5/i-MX-RT-Crossover-MCUs/uframeInterval-in-USB-HostEhciOpenInterrupt/m-p/858864#M1962 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P>What kind of application do you want USB to support? Interrupt with 1 microframe interval is really fast.</P><P></P><P>Regards,</P><P>Jing</P></BODY></HTML> Mon, 25 Feb 2019 05:42:17 GMT jingpan 2019-02-25T05:42:17Z uframeInterval in USB_HostEhciOpenInterrupt https://community.nxp.com/t5/i-MX-RT-Crossover-MCUs/uframeInterval-in-USB-HostEhciOpenInterrupt/m-p/858863#M1961 <HTML><HEAD></HEAD><BODY><P>In the RT1050 SDK, the function&nbsp;USB_HostEhciOpenInterrupt in usb_host_ehci.c,</P><P>there's a for loop to add QH to frame.</P><P>I uses RT1050 to connect to one&nbsp;USB HID device, which has 1 microframe interval in the descriptor.</P><P>In line 3173, the&nbsp;ehciPipePointer-&gt;uframeInterval / 8 equals to 0 if the USB device is with 1 microframe interval and it would result in the endless loop of this for loop.</P><P>How should I properly modify the code for the USB devices with 1 microframe interval?</P><P><span class="lia-inline-image-display-wrapper" image-alt="pastedImage_1.png"><img src="https://community.nxp.com/t5/image/serverpage/image-id/72086i075E52E9BB657780/image-size/large?v=v2&amp;px=999" role="button" title="pastedImage_1.png" alt="pastedImage_1.png" /></span></P></BODY></HTML> Wed, 13 Feb 2019 11:09:26 GMT https://community.nxp.com/t5/i-MX-RT-Crossover-MCUs/uframeInterval-in-USB-HostEhciOpenInterrupt/m-p/858863#M1961 jayyehtw 2019-02-13T11:09:26Z Re: uframeInterval in USB_HostEhciOpenInterrupt https://community.nxp.com/t5/i-MX-RT-Crossover-MCUs/uframeInterval-in-USB-HostEhciOpenInterrupt/m-p/858864#M1962 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P>What kind of application do you want USB to support? Interrupt with 1 microframe interval is really fast.</P><P></P><P>Regards,</P><P>Jing</P></BODY></HTML> Mon, 25 Feb 2019 05:42:17 GMT https://community.nxp.com/t5/i-MX-RT-Crossover-MCUs/uframeInterval-in-USB-HostEhciOpenInterrupt/m-p/858864#M1962 jingpan 2019-02-25T05:42:17Z Re: uframeInterval in USB_HostEhciOpenInterrupt https://community.nxp.com/t5/i-MX-RT-Crossover-MCUs/uframeInterval-in-USB-HostEhciOpenInterrupt/m-p/858865#M1963 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P><SPAN>Please modify the third item in that for-loop to ((ehciPipePointer-&gt;uframeInterval + 7) / 8). It should be ok.<BR /></SPAN></P><P></P><P><SPAN>Regards</SPAN></P><P><SPAN>Jing</SPAN></P></BODY></HTML> Mon, 25 Feb 2019 06:45:25 GMT https://community.nxp.com/t5/i-MX-RT-Crossover-MCUs/uframeInterval-in-USB-HostEhciOpenInterrupt/m-p/858865#M1963 jingpan 2019-02-25T06:45:25Z