use delayMicroseconds() in examples instead of less accurate empty active wait loop.

[JM-FRANCE]

instead of doing
microseconds = micros(); for(int i=0; i<samples; i++) { vReal[i] = analogRead(CHANNEL); vImag[i] = 0; while(micros() - microseconds < sampling_period_us){ //empty loop } microseconds += sampling_period_us; }

it's easier and more arduino like to do

for(int i=0; i<samples; i++) { vReal[i] = analogRead(CHANNEL); vImag[i] = 0; delayMicroseconds(sampling_period_us); }

delayMicroseconds() will perform likely more accurately than your active wait esp. if the sampling period is small.