<meta http-equiv="content-type" content="text/html; charset=utf-8"><blockquote class="gmail_quote" style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0.8ex; border-left-width: 1px; border-left-color: rgb(204, 204, 204); border-left-style: solid; padding-left: 1ex; "> One situation that is not handled well is unplugging/replugging of the<br>usb cable -- which may well happen between "runs" in a busy classroom.</blockquote><div><br></div><div>I was thinking just a moment ago on listening for "deviceadded" and "deviceremoved"</div> <div>signals from hal, hidding/unhidding nxt palette and calling find_one_brick only when</div><div>necessary. Do you think this is a good approach?<br>Is it possible to add and remove a palette on the fly?</div><br><div class="gmail_quote"> On Wed, Mar 23, 2011 at 1:54 PM, Martin Langhoff <span dir="ltr"><<a href="mailto:martin.langhoff@gmail.com">martin.langhoff@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"> Hi Emiliano, Walter, list,<br> <br> At <a href="http://dev.laptop.org/git/users/martin/turtleart/" target="_blank">http://dev.laptop.org/git/users/martin/turtleart/</a> you'll find<br> current TA master plus 2 patches. One is Emiliano's work, presented as<br> a single patch that only touches the relevant files. I think this is<br> good to merge.<br> <br> Author: Emiliano Pastorino <<a href="mailto:epastorino@plan.ceibal.edu.uy">epastorino@plan.ceibal.edu.uy</a>><br> Date: Wed Mar 23 11:49:02 2011 -0400<br> <br> Add LEGO Mindstorms NXT2.0 plugin based on nxt_python 2.1.0<br> <br> icons/nxtoff.svg | 84 ++++++++++++<br> icons/nxton.svg | 83 ++++++++++++<br> plugins/nxt_plugin.py | 339 +++++++++++++++++++++++++++++++++++++++++++++++++<br> po/es.po | 168 ++++++++++++++++++++++++<br> 4 files changed, 674 insertions(+), 0 deletions(-)<br> <br> The other one is<br> <br> Author: Martin Langhoff <<a href="mailto:martin@laptop.org">martin@laptop.org</a>><br> Date: Wed Mar 23 12:33:08 2011 -0400<br> <br> nxt: delay finding the NXT brick, offer NXT block everytime<br> <br> - Startup delays --due to searching for NXT bricks -- are gone<br> these delays affected all users with the libs installed.<br> <br> - All users that have nxt libraries installed see NXT blocks, and<br> can load/edit files w them.<br> <br> - NXT detection is delayed until we hit an NXT-related action block<br> <br> - We only try to stop NXT motors if we have seen an nxt brick<br> <br> plugins/nxt_plugin.py | 52 ++++++++++++++++++++++++++++--------------------<br> <br> To use/test my rework of Emiliano's patches, you'll want to have the<br> following rpms installed. They are built for Python 2.7 so F14 onwards<br> -- will prep F9 and F11 packages soon.<br> <a href="http://dev.laptop.org/~martin/public_rpms/nxt_python-2.1.0-1.fc16.noarch.rpm" target="_blank">http://dev.laptop.org/~martin/public_rpms/nxt_python-2.1.0-1.fc16.noarch.rpm</a><br> <a href="http://dev.laptop.org/~martin/public_rpms/lego-udevrules-1.0-1.fc14.noarch.rpm" target="_blank">http://dev.laptop.org/~martin/public_rpms/lego-udevrules-1.0-1.fc14.noarch.rpm</a><br> <br> With Emiliano's patch there is a very visible delay on startup, due to<br> the attempts to find an NXT brick. In fact I got worried for a moment<br> that the plugins model was to blame. My patch waits until we actually<br> need to talk to the brick to search for it, and displays a nice error<br> msg if we can't find it.<br> <br> One situation that is not handled well is unplugging/replugging of the<br> usb cable -- which may well happen between "runs" in a busy classroom.<br> <br> We could address that by wrapping every call to the NXT libs with a<br> try/except that retries the _find_brick() and retries the command.<br> <br> cheers,<br> <br> <br> m<br> <font color="#888888">--<br> <a href="mailto:martin.langhoff@gmail.com">martin.langhoff@gmail.com</a><br> <a href="mailto:martin@laptop.org">martin@laptop.org</a> -- Software Architect - OLPC<br> - ask interesting questions<br> - don't get distracted with shiny stuff - working code first<br> - <a href="http://wiki.laptop.org/go/User:Martinlanghoff" target="_blank">http://wiki.laptop.org/go/User:Martinlanghoff</a><br> </font></blockquote></div><br><br clear="all"><br>-- <br>Ing. Emiliano Pastorino<br>Centro Ceibal<br>Av. Italia 6201 Ed. Los Ceibos<br>Montevideo, Uruguay<br>Tel: (598) 2601 5773 int.: 2232 <br>