spi.send with Uint16Array

It's very interesting, to see, what experts like Gordon can do with Javascript on this small board.
I learned a lot. But still the function is very slow. Reading a block of 20*20 pixel takes 0.6 seconds.
Therefore I gave the new assembler interface a chance and created a short function with flat assembler.

thumb;
        lsr r0,#3
        lsr r1,#2
        lsr r2,#3
        lsl r0,#11
        lsl r1,#5
        add r0,r1
        add r0,r2
        mov r1,r0
        lsl r0,#8
        lsr r1,#8
        add r0,r1
        mov r1,#65535
        and r0,r1
return: bx lr

Next changed reading function in displaydriver to:

var zzz = new Uint8Array([0,0,0]);
sData = sData.map(function() {
  var d = spi.send(zzz);
  return ILIcalc(d[0],d[1],d[2]);  //ILIcalc is the name of new assembler based function
});

Now it takes 0.34 seconds, 44% faster.
This is still not as fast as I would like, but it shows how helpful assembler can be.