Em 10/11/2015 08:09, alan.b.pearce@stfc.ac.uk escreveu:
> But perhaps the other question is why use SD cards? Could you not use
> USB sticks? There is enough library code around to run USB OTG on
> various micros, and some of the units can do it reasonably fast.
> Although I haven't done the math, I really doubt you need a lot of
> speed to record audio at the rate you want.=20

The answer is simple.
a) An SD-Card is much smaller than an USB thumb-drive.
b) An SD-Card will fit snuggly into a slot and will not bounce, forcing
the connectors and producing poor contact. Also, the USB thumb-drive can
easily be ripped out/torn apart by an awkward movement.
c) The SD-Card supporting software is much smaller than an USB stack and
an MCU can probably achieve much higher transfer speeds with the SD-Card.


Cheers,

Isaac



--=20
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