Arduino 101 with I2S Microphone - On Custom Board

Hello Everyone,

We develop a smart collar for dogs and we use Intel Curie SoC with Arduino IDE.

Now, we are able to record some FFT data with this lib : arduino/libraries/PlainFFT at master · imagest108/arduino · GitHub

But we need more informations so more FFT points. We try to reach at 256 points but Curie is frozen.

Do you have any idea (Calculation Limit) ?
Are you trying to do the same application ?

Thanks !