https://community.nxp.com/t5/i-MX-RT-Crossover-MCUs/rt1176-usb/m-p/1605584#M23896 <P>Hi&nbsp;<a href="https://community.nxp.com/t5/user/viewprofilepage/user-id/204405">@eao</a>&nbsp;,</P> <P>USB FS bulk transfer size is limit to 64byte, even USB2.0 is limit to 512 byte. This is defined by the USB protocol. Please don't modify it.</P> <P>&nbsp;</P> <P>Regards,</P> <P>Jing</P> Sun, 26 Feb 2023 04:13:56 GMT jingpan 2023-02-26T04:13:56Z https://community.nxp.com/t5/i-MX-RT-Crossover-MCUs/rt1176-usb/m-p/1601518#M23801 <P>Hello, official website staff, I found a problem in rt1176 platform, in board_usb_device.c, line 350, function<BR />usb_DeviceCdcAcmRecv(handle, USB_CDC__VCOM_BULK_OUT_ENDPOINT, s_currRecvBuf, g_UsbDeviceCdcVcomDicEndpoint[1].maxPackrtSize), the last one in maxpacketsize parameter, I seem to be able to modify its size, I will modify it to 2048, the usb can still be normal, but once I modify it to 10000, it seems to communicate abnormal, please ask This is why? Thanks!</P> Mon, 20 Feb 2023 01:37:00 GMT https://community.nxp.com/t5/i-MX-RT-Crossover-MCUs/rt1176-usb/m-p/1601518#M23801 eao 2023-02-20T01:37:00Z https://community.nxp.com/t5/i-MX-RT-Crossover-MCUs/rt1176-usb/m-p/1605584#M23896 <P>Hi&nbsp;<a href="https://community.nxp.com/t5/user/viewprofilepage/user-id/204405">@eao</a>&nbsp;,</P> <P>USB FS bulk transfer size is limit to 64byte, even USB2.0 is limit to 512 byte. This is defined by the USB protocol. Please don't modify it.</P> <P>&nbsp;</P> <P>Regards,</P> <P>Jing</P> Sun, 26 Feb 2023 04:13:56 GMT https://community.nxp.com/t5/i-MX-RT-Crossover-MCUs/rt1176-usb/m-p/1605584#M23896 jingpan 2023-02-26T04:13:56Z