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1  Using Arduino / Storage / Re: 2Mbit write to SD - Is it possible ? on: October 21, 2012, 07:50:42 am
Just asked if anyone has experience. I don't even have any Arduino boards yet.  Just needed a proof of concept.
2  Using Arduino / Storage / Re: 2Mbit write to SD - Is it possible ? on: October 21, 2012, 07:33:07 am
No no no... i am limited to official arduino boards only smiley-sad

I have this work on XMEGA + NAND  and need to port in some way to Arduino + SD.   So maybe SRAM will help in the middle ?
3  Using Arduino / Storage / Re: 2Mbit write to SD - Is it possible ? on: October 21, 2012, 07:15:03 am
I see....

Probably i'll have to use an external parallel SRAM to buffer the whole data (lets say 128kb)  and then dump it slowly to SD.
Do you think the SRAM interface should withstand such rate together with SPI read ?

Currently on XMGEA @ 12Mhz i can write to NAND IC  (parralel) over 7 Mbit/sec 
4  Using Arduino / Storage / Re: 2Mbit write to SD - Is it possible ? on: October 21, 2012, 02:38:14 am
Thanks guys,

The bit stream is indeed much larger than available RAM.
Found a benchmark here :  http://www.roland-riegel.de/sd-reader/benchmarks/   of   195kbyte/sec   that is not so far from the 256kb/sec i need.
Another one here :   http://arduino.cc/forum/index.php/topic,118529.0.html  states    "256000 bytes per second" in RAW mode.

Sounds pretty on the limit.... but may be possible ?

Maybe it is possible to write in 4bit mode ?  Do you think it will be any faster ?  is there any ready library for this ?




5  Using Arduino / Storage / 2Mbit write to SD - Is it possible ? on: October 17, 2012, 05:58:42 am
Hi,

I have a working project (works on ATXmega) where a 2Mbit data stream is read from SPI (via DMA) and is written to data storage.
I'd like to port it for Arduino board.  As i see none support DMA.

The question is if it is possible to read 2Mbit/s stream of data  and write it to SD card  on any of Arduino boards ?

Thanks.
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