Maple Atmel Dataflash library!

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Maple Atmel Dataflash library!

(6 posts) (3 voices)

Started 4 years ago by robodude666
Latest reply from mbolivar

robodude666
Member

Hey folks,

I created my first GitHub fork/repo today, and I'm excited to share it with you!
https://github.com/robodude666/maple-dataflash <-- Click it!

It's a fork of the arduino-dataflash library. I'll be adding various improvements to it over time. Some things I'm currently considering/working on:

- Taking advantage of libmaple
- Improving performance
- DMA support
- Fun stuff!

The library currently only supports the AT45DB161D (16Mbit Serial Flash). Support for other parts is possible, and we'll see.

-robodude666

Posted 4 years ago #
mbolivar
LeafLabs

awesome! looks like this would make a good addition to the wiki's libraries page:

http://wiki.leaflabs.com/index.php?title=Libraries

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.

Posted 4 years ago #
robodude666
Member

mbolivar,

That's be awesome! I'll let you know when it's ready.

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.

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.

-robodude666

Posted 4 years ago #
robodude666
Member

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 =].

Posted 4 years ago #
poslathian
LeafLabs

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.

Posted 4 years ago #
mbolivar
LeafLabs

robodude,

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.

As you've probably noticed, there's a preliminary page on using dma.h in the wiki:

http://wiki.leaflabs.com/index.php?title=DMA

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.

Posted 4 years ago #

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