sd card + SPIFIFO or spi4teensy3

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stephanschulz

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hi.

is it possible to use any of these two SPI libraries to read data of an SD card?

i am currently using <SPI.h> and <SdFat.h> successfully on my teens 3.1.
but i was hoping to try the faster libraries.

thanks,stephan.
 
Based no numerous threads I'd believe that SDFat is about as fast as you can get.
The rest depends on writing to the SD card in larger blocks e.g. 512 bytes rather than byte wise.
 
Have you done any measurements of the actual speed you're getting?

If you're reading multiple files, or seeking within a file, have you tried measuring the speed on different cards? For sequential access, they're all pretty similar, but when you start reading from more than one location, there's a pretty huge difference between cards. The "class 10" and other markings on the cards are pretty much worthless, since they're only about sequential speed. Many of the slowest random access cards are rated "class 10".
 
Oh my, is there an open source library for those buttons?

If so, I believe PJRC is going to need to buy some of those for me to play with!!!!
 
true. budget is spent. everything does work well, on my first proto PCB. but the next version (smaller) seemed to have introduced some noise on the data line and one of the screens sometimes has an image error.
that's why i thought a fast SPI might be good to try.
or to have the sd card on a separate spi buss.
 
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