Espruino Wifi and SPW2430(microphone)

It wasn't reset properly. This is the code im currently using for the voice recording using the SPW2430(microphone)

var spi = new SPI(); 
spi.setup({mosi:B15, miso:B14, sck:B10});
E.connectSDCard(spi, B1);
console.log(require("fs").readdirSync())­;

require("fs").writeFileSync("X.raw");

var w = new Waveform(512,{doubleBuffer:true,bits:16}­);
var a = new Uint16Array(512);
w.on("buffer", function(buf) {
  a.set(buf);
  E.FFT(a);
  require("fs").appendFileSync("X.raw", a);
  var m=0,n=-1;
  for (var i=100;i<1000;i++)if(a[i]>n)n=a[m=i];
  console.log(m.toFixed(0)+"Hz @ "+n);
});

analogWrite(B0, 0.5, {freq:20000});
w.startInput(B0,2000,{repeat:true});
//w.stop();
setInterval(function() {
  w.stop();
},10000);

would the Hardware drive the values for var i? meaning if my mic can record from 100Hz to 10kHz do i put i=100,i<10000?

with the code above the IDE writes

>[
  "System Volume Information",
"X.raw"
 ]
=undefined
105Hz @ 4
127Hz @ 6
194Hz @ 5
128Hz @ 5
444Hz @ 6
423Hz @ 5
181Hz @ 4
107Hz @ 6
101Hz @ 4
506Hz @ 22
470Hz @ 7
469Hz @ 8
425Hz @ 6
233Hz @ 7
152Hz @ 6
130Hz @ 5
121Hz @ 6
438Hz @ 7
481Hz @ 10
168Hz @ 6
>

I still cannot get proper voice playback so I thought maybe my sample rate needed to go up but, when I change the sample rate to 1024 in waveform and and Uint16array the IDE gives me an error code.

in function called from system
Uncaught Error: Insufficient stack for computing FFT
 at line 2 col 10
  E.FFT(a);