http://forums.leaflabs.com/topic.php?id=723 A place to share, learn, and grow... en-US Fri, 22 Jan 2016 00:11:57 +0000 http://bbpress.org/?v=1.0.2 q http://forums.leaflabs.com/search.php http://forums.leaflabs.com/topic.php?id=723#post-4228 Thu, 07 Apr 2011 21:13:23 +0000 mbolivar 4228@http://forums.leaflabs.com/ <p>gbulmer,</p> <blockquote><p> My question was, effectively, is it safe to assume that pin will NOT get used by Maple compatible USB bootloaders? </p></blockquote> <p>Yes, that is a safe assumption. </p> http://forums.leaflabs.com/topic.php?id=723#post-4209 Thu, 07 Apr 2011 11:42:41 +0000 gbulmer 4209@http://forums.leaflabs.com/ <blockquote><p>So USB_P is not really actively used on Maple; it's to tell whether or not the USB is plugged in so ostensibly it could be useful, but the bootloader does not rely on it. </p></blockquote> <p>Okay, so I can use it without any risk of interfering with the bootloader.</p> <blockquote><p>However there's not really a plan to break it out to a GPIO in future revisions, as we're trying to keep the hardware as stable as possible from here on out. </p></blockquote> <p>That is a reasonable answer.<br /> I think you are right to try to keep Maple's hardware interface stable.</p> <p>My question was, effectively, is it safe to assume that pin will NOT get used by Maple compatible USB bootloaders?<br /> I think the answer is, the pin isn't on a GPIO header, so it isn't certain it will never get used, but it isn't used now, and there are no plans to use it currently in the works.</p> <p>It might be nice to have one page which documents the status of pins across the whole Maple range. This one might be in different groups on each product. I'd add a new 'column' to represent a product version when a pin moves from one category, or physical location, to another.</p> <p>Edit: (full disclosure: I am not a member of the LeafLabs staff) </p> http://forums.leaflabs.com/topic.php?id=723#post-4205 Thu, 07 Apr 2011 11:07:48 +0000 jessb 4205@http://forums.leaflabs.com/ <p>So USB_P is not really actively used on Maple; it's to tell whether or not the USB is plugged in so ostensibly it could be useful, but the bootloader does not rely on it. However there's not really a plan to break it out to a GPIO in future revisions, as we're trying to keep the hardware as stable as possible from here on out. sorry! </p> http://forums.leaflabs.com/topic.php?id=723#post-4199 Thu, 07 Apr 2011 05:33:05 +0000 gbulmer 4199@http://forums.leaflabs.com/ <p>I had a look at the Eagle CAD for maple mini, and AFAIK, it only uses three signal pins, D+/D- for USB data, and DISC which is connected to pin 46, PB9/TIM4_CH4.</p> <p>Maple uses four signals, it uses PC11, pin 52, to connect to USB_P, which has no counterpart on maple mini.</p> <p>I am all in favour of freeing more pins for me to use!<br /> So will PC11 on Maple be freed up, and specifically unused by USB software, e.g. bootloader, once the Maple mini is released?</p> <p>(I'd really like to free the pin.) </p>