tjc / arduino Goto Github PK

}
else{
  //this could be done with the fix_fftr function without the im array.
  fix_fft(data,im,7,0);
  // I am only interessted in the absolute value of the transformation
  for (i=0; i< 64;i++){
     data[i] = sqrt(data[i] * data[i] + im[i] * im[i]);
  }

  //do something with the data values 1..64 and ignore im
  show_big_bars(data,0);
}

tt = millis();

}
}

/*

this should give an fft with

• sampling rate: 1ms
• frequency range: - 7.8 to 500 Hz in 64 7.8hz bands

there is a lot that can be improved:

• fix bugs
• replace FIX_MPY by inline assembler
• do sampling with timer and interrupts
• use fix_fftr instead of fix_fft to save ram (i did not get the math right)

*/`

But get error
'show_big_bars' was not declared in this scope

How do I debug it??

Pls help!!!