AVR-Chat

Juistb discoverd this chip, an 18 pin DIP (also available in SMD 
packaging) which provides a very powerful FPU + other functions, 
including 2 12 bit ADCs, a full RS-232 port (including level shifting), 
string processing, NMEA string parsing, numeric to string and string to 
numeric as well as numeric format conversions (8, 16, 32 bit int back 
and forth, as well as IEEE 754 FP back and forth).   Costs are $19.95 
qty 1 (Sparkfun), $13.95 qty 100. 

http://www.micromegacorp.com/umfpu-v3.html  fior technical information.

  Offers both SPI (15 Mhz) and I2C (400 Khz) interface, ~~ 30 Mhz 
operation (without ANY external components, you can add an external 
crystal/cap network to boost speed a little, apparently).

   Not exactly inexpensive, but not badly priced for all it will do.

   Thought you guys would like to know about this, in case you didn't 
already know.

avrFreak

well, as an update on speed for these chips, I received an email from a 
support engineer who assured me that they could easily do 2500 sets of 
calcs.second involving several trig functions, several FP multiply, 
divde add and subtract functions each.

The Instruction Manual document freeling available on their web site 
lists all instruction timing data in Appendix B,, IIRC.

avrFreak.


P.S.  I would be interested in hearing from anyone who gives these a 
try.  I am considering using them to support my Space Vector PWM 
Variable Frequency motor speed controller for 5-10 HP three phase 
induction motors (a hobby project, believe it or not)