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[Reply #15 on:]

Why would I ever do anything but?  That is why we're all here, after all.

You could have mentioned that in reply #2, but it seems you decided to spin it out, in what might be (mis?)interpreted as a cynical ploy to bump your post count.

[Reply #16 on:]

Why would I ever do anything but?  That is why we're all here, after all.

You could have mentioned that in reply #2, but it seems you decided to spin it out, in what might be (mis?)interpreted as a cynical ploy to bump your post count.

... like I need that ...

I have found that whenever I mention a microcontroller that isn't Atmel, that certain people immediately leap down my throat.  Yes, I may prefer other brands, but that's not to say that Atmel is bad as such.  It's horses for courses, and I just haven't found the right course for Atmel.  I don't specifically favour any one brand - I have Atmel, TI, Microchip, even 8052 microcontrollers here.  But 9 times out of 10 I always come back to the same type, because they seem to have the best offerings.

But heaven forbid I should actually suggest that to someone...

[Reply #17 on:]

If you think that Arduino is not a sensible way to solve a given problem then I think it's appropriate to say that. If you're able to suggest a different solution which is more feasible, so much the better. Just don't expect to get help for non-Arduino problems on the Arduino forum.

[Reply #18 on:]

whenever I mention a microcontroller that isn't Atmel, that certain people immediately leap down my throat.

Really?   Here, rather than over on avrfreaks (which is Atmel-sponsored)?
I haven't had that problem; and I've mentioned/discussed Chipkit, teensy 3, launchpad, and others.

Perhaps it's your delivery...

[Reply #19 on:]

Another reason I never pick Atmel for my real projects.  Just too under powered and feature scarce for the price.

Why are you here then, out of curiosity?

It's like going onto a Ford motor car forum, and saying "I never drive a Ford, they are hopeless". What's the point?

[Reply #20 on:]

2) How fast can arduino handle dma and interupts and what are speed considerations?, i.e. what is the shortest usleep in the main loop that can guarantee a constant step rate?

OK, what is the real problem here? This reminds me of people who want to do multi-threading or "break out of interrupts". This sort of low-level question is meaningless without a context.

What device are you planning to use? Link to datasheet please.

What's all this about? ...

1) The arduino must take SPI packets of data (64 bytes I guess) as fast as possible
2) store SPI data in memory
3) constantly step through memory and switching IO pins

A disk drive? Don't you know how big the packets are? Why does it have to be as fast as possible? How fast is that anyway?

These are $5 chips. They are good at what they do, opinions of other posters to the contrary. But you aren't going to make a 3D graphics card out of one.