http://forums.leaflabs.com/topic.php?id=771 A place to share, learn, and grow... en-US Fri, 22 Jan 2016 00:25:08 +0000 http://bbpress.org/?v=1.0.2 q http://forums.leaflabs.com/search.php http://forums.leaflabs.com/topic.php?id=771#post-4677 Thu, 19 May 2011 11:12:29 +0000 poslathian 4677@http://forums.leaflabs.com/ <p>Thats disappointing, been there! Since you were interfacing with a 5V device, is it possible you were using some pins that werent 5V tolerant (Maple runs at 3.3V, but quite a few pins are 5V tolerant). </p> <p>Also, I have bricked many a board by not paying attention to push-pull inputs. Drive a "1" onto a pushpull output pin thats set to 0, and you get a short. Usually this only breaks that pin though, not the whole MCU. </p> http://forums.leaflabs.com/topic.php?id=771#post-4609 Sat, 14 May 2011 18:49:32 +0000 JBernardo 4609@http://forums.leaflabs.com/ <p>No, the board worked fine for the past 2 months... The problem appeared suddenly.</p> <p>I've disconnected everything and plugged only the USB cable. The blue LED don't light anymore and the the chip become really hot within one second.</p> <p>I moved from an Arduino to this board because my application was too heavy for an AVR and because of source code compatibility. I think I will purchase a new one from Seeed Studio (as I did before) but don't believe it will arrive here (unfortunately I'm from Brazil) before my project deadline.</p> <p>With my experience, it's a little bit faster buying from China than from the US. </p> http://forums.leaflabs.com/topic.php?id=771#post-4606 Sat, 14 May 2011 17:46:45 +0000 mbolivar 4606@http://forums.leaflabs.com/ <p>JBernardo,</p> <p>Sorry to hear that you're having problems. Please let us know if you find any shorts.</p> <p>If you believe your board shipped with any problems, we'd be happy to replace it for you. Feel free to contact us at <a href="mailto:info@leaflabs.com">info@leaflabs.com</a> for more on that. </p> http://forums.leaflabs.com/topic.php?id=771#post-4599 Sat, 14 May 2011 13:40:03 +0000 JBernardo 4599@http://forums.leaflabs.com/ <p>Looks like it isn't a software problem...<br /> The CPU overheats as soon as I turn on the power... I tried a couple times and, at first the led started blinking 6 times (as expected) but then just burning smell came out of the board.<br /> The second time, nothing happened besides heating...</p> <p>I removed the LCD and I'm trying to find any short circuits before testing again.</p> <p>Any thoughts? </p> http://forums.leaflabs.com/topic.php?id=771#post-4591 Fri, 13 May 2011 22:52:10 +0000 JBernardo 4591@http://forums.leaflabs.com/ <p>Hi again,</p> <p>I've experienced some strange problems with my maple board and I'm a little afraid of turning it on again.</p> <p>I have a 16x2 text LCD (with a 5V regulator) on a breadboard alongside the maple board. Both the regulator and maple are connected to a 9V power supply.</p> <p>Things were working just fine but, after I changed some class constructor argument from a object pointer to a object reference, the microcontroller went crazy (led throbbing <strong>really</strong> fast and a little overheat)!</p> <p>I don't remember doing any other changes between the working program and the non working one... So the problem may be a invalid reference being passed and wrong areas of memory being accessed.</p> <p>Pin 13 is also used to send data to LCD so led throbbing may or may not represent a problem with the lcd (does the board complain when errors occur?).</p> <p><em>Another fact is that the initial message shown on the display appeared normally before this happen.</em></p> <p>i had something like that:<br /> <pre><code>StateMachine state_machine(&amp;container); //Possibly affected ctor container.lcd &lt;&lt; &quot;Initial Message&quot;; delay(1000); container.lcd.clear(); for(;;){ // run forever... state_machine accesses lcd through container }</code></pre> <p>The question is: Should I try powering again the board and using perpetual bootload mode?<br /> Maybe the problem is not with software but hardware?</p> <p>Thanks! </p>