topic USB_EVT_IN_NAK missing in action in LPC Microcontrollers https://community.nxp.com/t5/LPC-Microcontrollers/USB-EVT-IN-NAK-missing-in-action/m-p/523799#M6435 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by chris_bayley_trimble on Sun Aug 23 21:30:21 MST 2015</STRONG><BR /><SPAN>In using USBD ROM if I initialise the stack, register endpoint handlers, and EnableEvent(USB_EVT_IN_NAK &amp; USB_EVT_OUT_NAK) on the endpoints BUT do NOT prime the endpoints I expect that the first events I will have to handle in the endpoint handler is an IN_NAK or OUT_NAK depending on the direction. I observe this to be true for the OUT_NAK but I get no event for an IN request when the EP is not primed. Is this the expected behaviour ?</SPAN><BR /><SPAN>How can I get a IN_NAK before the endpoint is primed ?</SPAN><BR /><SPAN>(I have some sleeping peripherals that I wish to wake upon arrival of the first NAK which will produce my USB data)</SPAN><BR /><BR /></BODY></HTML> Wed, 15 Jun 2016 16:46:04 GMT lpcware 2016-06-15T16:46:04Z USB_EVT_IN_NAK missing in action https://community.nxp.com/t5/LPC-Microcontrollers/USB-EVT-IN-NAK-missing-in-action/m-p/523799#M6435 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by chris_bayley_trimble on Sun Aug 23 21:30:21 MST 2015</STRONG><BR /><SPAN>In using USBD ROM if I initialise the stack, register endpoint handlers, and EnableEvent(USB_EVT_IN_NAK &amp; USB_EVT_OUT_NAK) on the endpoints BUT do NOT prime the endpoints I expect that the first events I will have to handle in the endpoint handler is an IN_NAK or OUT_NAK depending on the direction. I observe this to be true for the OUT_NAK but I get no event for an IN request when the EP is not primed. Is this the expected behaviour ?</SPAN><BR /><SPAN>How can I get a IN_NAK before the endpoint is primed ?</SPAN><BR /><SPAN>(I have some sleeping peripherals that I wish to wake upon arrival of the first NAK which will produce my USB data)</SPAN><BR /><BR /></BODY></HTML> Wed, 15 Jun 2016 16:46:04 GMT https://community.nxp.com/t5/LPC-Microcontrollers/USB-EVT-IN-NAK-missing-in-action/m-p/523799#M6435 lpcware 2016-06-15T16:46:04Z