http://forums.leaflabs.com/topic.php?id=1857 A place to share, learn, and grow... en-US Fri, 22 Jan 2016 00:27:11 +0000 http://bbpress.org/?v=1.0.2 q http://forums.leaflabs.com/search.php http://forums.leaflabs.com/topic.php?id=1857#post-11064 Mon, 04 Jun 2012 19:43:32 +0000 gbulmer 11064@http://forums.leaflabs.com/ <p>"Is there a way to remove jitter in the ISR without disbling the USB."<br /> Not easily.<br /> "It can ignore all USB commands during this time."<br /> A host polls a USB device every millisecond (or more frequently), and if the device doesn't respond, the host system will eventually think it is 'dead'. </p> <p>One approach would be to 'drop' the USB pull-up resistor, do the ISR's, then pull the resistor up again, which will trigger the host to re-enumerate the device if it has been 'off' long enough. An alternative is to use a separate USB to serial cable, and communicate with the host via that, never enabling USB.</p> <p>(Full disclosure: I am not a member of LeafLabs staff.) </p> http://forums.leaflabs.com/topic.php?id=1857#post-11062 Mon, 04 Jun 2012 19:21:00 +0000 hans 11062@http://forums.leaflabs.com/ <p>Is there a way to remove jitter in the ISR without disbling the USB.<br /> I need to be able place the Maple into a mode where it only handles ISRs. It can ignore all USB commands during this time. After a certain event the ISR will be disabled and I then need to be able to receive USB commands again. Disabling the USB causes it to be removed from the device manager and my software looses conneection.<br /> Any help woul be apprecieated.<br /> - Hans </p>