http://forums.leaflabs.com/topic.php?id=887 A place to share, learn, and grow... en-US Fri, 22 Jan 2016 00:08:19 +0000 http://bbpress.org/?v=1.0.2 q http://forums.leaflabs.com/search.php http://forums.leaflabs.com/topic.php?id=887#post-5558 Wed, 06 Jul 2011 12:17:29 +0000 mbolivar 5558@http://forums.leaflabs.com/ <p>robodude,</p> <p>Sounds good. It's great to hear that dma.h is getting some exercise, and we're looking forward to any feedback/patches you have for it. Those will be super useful when it comes time to put together the Wirish-style DMA library.</p> <p>As you've probably noticed, there's a preliminary page on using dma.h in the wiki:</p> <p><a href="http://wiki.leaflabs.com/index.php?title=DMA" rel="nofollow">http://wiki.leaflabs.com/index.php?title=DMA</a></p> <p>It's pretty much the contents of the old libmaple notes/dma.txt, so it could definitely use some love, if you've got time to tweak it. </p> http://forums.leaflabs.com/topic.php?id=887#post-5548 Wed, 06 Jul 2011 10:47:47 +0000 poslathian 5548@http://forums.leaflabs.com/ <p>I was actually just working on a project that, as a hack, was dumping datalogs into the onboard flash memory. This is dangerous for reasons of limited r/w cycles, but it worked out OK. Its too bad that the dataflash lib expects the transactions to go over SPI, if there were a dataFlashWrite(byte) sort of situation, we could easily create a virtual flash device out of the unused program memory pages that worked with the library. </p> http://forums.leaflabs.com/topic.php?id=887#post-5499 Sat, 02 Jul 2011 09:56:37 +0000 robodude666 5499@http://forums.leaflabs.com/ <p>You know what. 280 KBps is too slow. How would you like 2.1 MBps continuous read speeds? Early DMA implementation yields a 7.7x boost in continuous read performance =]. </p> http://forums.leaflabs.com/topic.php?id=887#post-5496 Fri, 01 Jul 2011 19:12:13 +0000 robodude666 5496@http://forums.leaflabs.com/ <p>mbolivar,</p> <p>That's be awesome! I'll let you know when it's ready.</p> <p>I worked on the library a little bit today. Changes were minor (benchmark example), but they'll allow me to judge performance improvements over time. I brainstormed some ideas on how I want to implement DMA and I'll be doing that tomorrow... ish.</p> <p>From my early benchmarks, writing to the DataFlash is ~7x slower than reading from it, though I'm able to get ~280 KBps continuous reads out of it.</p> <p>-robodude666 </p> http://forums.leaflabs.com/topic.php?id=887#post-5452 Wed, 29 Jun 2011 15:19:24 +0000 mbolivar 5452@http://forums.leaflabs.com/ <p>awesome! looks like this would make a good addition to the wiki's libraries page:</p> <p><a href="http://wiki.leaflabs.com/index.php?title=Libraries" rel="nofollow">http://wiki.leaflabs.com/index.php?title=Libraries</a></p> <p>if/when you feel like it's ready for general use, we can work something out where it lives in libmaple's libraries/ directory as a git submodule. </p> http://forums.leaflabs.com/topic.php?id=887#post-5438 Tue, 28 Jun 2011 12:15:59 +0000 robodude666 5438@http://forums.leaflabs.com/ <p>Hey folks,</p> <p>I created my first GitHub fork/repo today, and I'm excited to share it with you!<br /> <a href="https://github.com/robodude666/maple-dataflash" rel="nofollow">https://github.com/robodude666/maple-dataflash</a> &lt;-- Click it!</p> <p>It's a fork of the <a href="https://github.com/BlockoS/arduino-dataflash">arduino-dataflash</a> library. I'll be adding various improvements to it over time. Some things I'm currently considering/working on:</p> <p>- Taking advantage of libmaple<br /> - Improving performance<br /> - DMA support<br /> - Fun stuff!</p> <p>The library currently only supports the AT45DB161D (16Mbit Serial Flash). Support for other parts is possible, and we'll see.</p> <p>-robodude666 </p>