topic How to increase polling interval of USB Keyboard Device example? in MQX Software Solutions https://community.nxp.com/t5/MQX-Software-Solutions/How-to-increase-polling-interval-of-USB-Keyboard-Device-example/m-p/656282#M17262 <HTML><HEAD></HEAD><BODY><P>I am currently using USB Keyboard Device example from MQX 4.2.0. I have successfully integrated this example into current MQX 4.0.0 and I am able to send data to my laptop on USB port. The only problem I am facing is it is continuously sending NULL keys when no key is pressed causing unwanted traffic on USB bus. When I checked packets coming from standard USB keyboard on Wireshark, it does not send anything unless any key is pressed. How do I make the Keyboard example work like standard keyboard? I suspect this is the issue with the initialization of USB device. </P><P></P><P>Thanks!</P></BODY></HTML> Wed, 15 Mar 2017 18:56:49 GMT omkar_ppk 2017-03-15T18:56:49Z How to increase polling interval of USB Keyboard Device example? https://community.nxp.com/t5/MQX-Software-Solutions/How-to-increase-polling-interval-of-USB-Keyboard-Device-example/m-p/656282#M17262 <HTML><HEAD></HEAD><BODY><P>I am currently using USB Keyboard Device example from MQX 4.2.0. I have successfully integrated this example into current MQX 4.0.0 and I am able to send data to my laptop on USB port. The only problem I am facing is it is continuously sending NULL keys when no key is pressed causing unwanted traffic on USB bus. When I checked packets coming from standard USB keyboard on Wireshark, it does not send anything unless any key is pressed. How do I make the Keyboard example work like standard keyboard? I suspect this is the issue with the initialization of USB device. </P><P></P><P>Thanks!</P></BODY></HTML> Wed, 15 Mar 2017 18:56:49 GMT https://community.nxp.com/t5/MQX-Software-Solutions/How-to-increase-polling-interval-of-USB-Keyboard-Device-example/m-p/656282#M17262 omkar_ppk 2017-03-15T18:56:49Z Re: How to increase polling interval of USB Keyboard Device example? https://community.nxp.com/t5/MQX-Software-Solutions/How-to-increase-polling-interval-of-USB-Keyboard-Device-example/m-p/656283#M17263 <HTML><HEAD></HEAD><BODY><P>Hi Omkar:</P><P></P><P>USB bus polling interval of interrupt transfer is configured in USB device (Endpoint) descriptor (bInterval parameter).</P><P></P><P>Regards</P><P>Daniel</P></BODY></HTML> Mon, 15 May 2017 02:09:23 GMT https://community.nxp.com/t5/MQX-Software-Solutions/How-to-increase-polling-interval-of-USB-Keyboard-Device-example/m-p/656283#M17263 danielchen 2017-05-15T02:09:23Z