SPI question

Modularized.

I posted the module - does this work?

SPI1.setup({ miso:B4, sck:B3, baud:1000000 });
var max=require("http://drazzy.com/espruino/MAX31855.js").connect(SPI1,C0);

console.log(max.getTemp());

Module code:

exports.connect = function(spi,cs) {
  return new MAX31855(spi,cs);
};

function MAX31855(spi,cs) {
  this.spi=spi;
  this.cs=cs;
}

MAX31855.prototype.getTemp = function () {
  var d = SPI1.send("\0\0\0\0",C0); 
  var trtn={};
  trtn.temp=(d.charCodeAt(0)<<6 | d.charCodeAt(1)>>2)*0.25;
  if (d.charCodeAt(1) & 1)  {
    var fault = (d.charCodeAt(3) & 7);
    switch (fault) {
      case 1:
        trtn.fault="No probe detected";
      case 3:
        trtn.fault="Probe shorted to Ground";
      case 4:
        trtn.fault="Probe shorted to VCC";
      default:
        trtn.fault=fault;
    }
  }
  return trtn;
};