[duskwuff]

Arduino has had ARM-based boards for years, starting with the Arduino Due in 2012; most of their newer boards use ATSAMD MCUs rather than the AVR8 parts they started out with. There's also a pretty active community supporting STM32 ARM hardware at https://www.stm32duino.com/.

The "FPGA acceleration", on the other hand, is pretty limited. Arduino has one board -- the MKR Vidor 4000 [1] -- with an onboard FPGA. The FPGA can be configured with one of a couple prepackaged bitstreams to add I/Os or perform some specific video processing tasks; it does not accelerate processing on the Arduino MCU. The documentation for the board is minimal, and support for generating your own bitstreams is basically nonexistent. The whole thing has a half-baked feel to it; I'd avoid it.

[1]: https://store.arduino.cc/usa/mkr-vidor-4000

[neltnerb]

Thanks for the link to the Vidor, unfortunate it wasn't more functional. It'll happen someday and when it does I'll be very excited, I know that there are already hybrid FPGA/microcontroller chips as an alternative to putting a softcore microcontroller on the FPGA itself (and wasting a lot more space and speed than needed).

I await the day when I can be like "nah, pin 2 will be a 16-bit 10MHz PWM output controlled by this register and pin 7 will be a frequency counter" and then access that with code on the microcontroller as if it was a built in peripheral.

I'm kind of skeptical I'll ever really get into FPGAs otherwise, my use case for them is always so simple, at the level of... well... PWM outputs and PID loops. But a microcontroller is fast enough for most PID loops so really to me the advantage is customizable function-pin mappings. I can't imagine trying to implement something like an ethernet stack on an FPGA though, although I guess you can run DOOM on one so maybe there will be a compiler from C++ to FPGA somehow that's not comically bad. ;-)

[Ccecil]

There was the papilio duo too which had the Spartan 6 LX9 FPGA with an ATmega32U4 on the bottom. Not sure if they are for sale anymore though. I backed the kickstarter (and work with a company which made some of the wings for them) but I never really got into using them. I still have mine around and plan on using it for some project in the future though.

http://papilio.cc/index.php?n=Papilio.PapilioDUOHardwareGuid...

edit: yep...still for sale http://store.gadgetfactory.net/fpga/