RGB Led Project - Help

/*var sensor = require("HC-SR04").connect(C6,C7,function(dist) {
  console.log(dist+" cm away");
});
setInterval(function() {
  sensor.trigger(); // send pulse
}, 500);
*/
LCD.clear();

SPI2.setup({baud:3200000, mosi:B15});
var rgb = new Uint8Array(50*3);

var pos=0;

function lightsOff() {
  clearInterval(cycle);
  pos++;
  for (var i=0;i<rgb.length;i+=3) {
    rgb[i  ] = 0;
    rgb[i+1] = 0;
    rgb[i+2] = 0;
  }
  SPI2.send4bit(rgb, 0b0001, 0b0011);
}

var patterns = [];
//patterns.push(lightsOff);
patterns.push(function() {
  // Fading white lights
  pos++;
  for (var i=0;i<rgb.length;i+=3) {
     var col = (Math.sin(i+pos*0.2)+1) * 127;
     rgb[i  ] = col;
     rgb[i+1] = col;
     rgb[i+2] = col;
  }
});
patterns.push(function() {
  // Fading Red lights
  pos++;
  for (var i=0;i<rgb.length;i+=3) {
     var col = (Math.sin(i+pos*0.2)+1) * 127;
     rgb[i  ] = col;
     rgb[i+1] = 0;
     rgb[i+2] = 0;
  }
});
patterns.push(function() {
  // Fading Green lights
  pos++;
  for (var i=0;i<rgb.length;i+=3) {
     var col = (Math.sin(i+pos*0.2)+1) * 127;
     rgb[i  ] = 0;
     rgb[i+1] = col;
     rgb[i+2] = 0;
  }
});
patterns.push(function() {
  // Fading Blue lights
  pos++;
  for (var i=0;i<rgb.length;i+=3) {
     var col = (Math.sin(i+pos*0.2)+1) * 127;
     rgb[i  ] = 0;
     rgb[i+1] = 0;
     rgb[i+2] = col;
  }
});
patterns.push(function() {
  // Low red light
  pos++;
  for (var i=0;i<rgb.length;i+=3) {
     var col = 85;
     rgb[i  ] = col;
     rgb[i+1] = 0;
     rgb[i+2] = 0;
  }
});
patterns.push(function() {
  // Medium red light
  pos++;
  for (var i=0;i<rgb.length;i+=3) {
     var col = 170;
     rgb[i  ] = col;
     rgb[i+1] = 0;
     rgb[i+2] = 0;
  }
});
patterns.push(function() {
  // Full red light 2
  pos++;
  for (var i=0;i<rgb.length;i+=3) {
     var col = 255;
     rgb[i  ] = col;
     rgb[i+1] = 0;
     rgb[i+2] = 0;
  }
});
patterns.push(function() {
  //  low blue light
  pos++;
  for (var i=0;i<rgb.length;i+=3) {
     var col = 85;
     rgb[i  ] = 0;
     rgb[i+1] = 0;
     rgb[i+2] = col;
  }
});
patterns.push(function() {
  // Med blue light
  pos++;
  for (var i=0;i<rgb.length;i+=3) {
     var col = 170;
     rgb[i  ] = 0;
     rgb[i+1] = 0;
     rgb[i+2] = col;
  }
});
patterns.push(function() {
  // Full blue light
  pos++;
  for (var i=0;i<rgb.length;i+=3) {
     var col = 255;
     rgb[i  ] = 0;
     rgb[i+1] = 0;
     rgb[i+2] = col;
  }
});
patterns.push(function() {
  //  low Green light
  pos++;
  for (var i=0;i<rgb.length;i+=3) {
     var col = 85;
     rgb[i  ] = 0;
     rgb[i+1] = col;
     rgb[i+2] = 0;
  }
});
patterns.push(function() {
  // Med Green light
  pos++;
  for (var i=0;i<rgb.length;i+=3) {
     var col = 170;
     rgb[i  ] = 0;
     rgb[i+1] = col;
     rgb[i+2] = 0;
  }
});
patterns.push(function() {
  // Full Green light
  pos++;
  for (var i=0;i<rgb.length;i+=3) {
     var col = 255;
     rgb[i  ] = 0;
     rgb[i+1] = col;
     rgb[i+2] = 0;
  }
});
patterns.push(function() {
  // Fading colours
  pos++;
  for (var i=0;i<rgb.length;i+=3) {
     rgb[i  ] = (1 + Math.sin((i+pos)*0.1324)) * 127;
     rgb[i+1] = (1 + Math.sin((i+pos)*0.1654)) * 127;
     rgb[i+2] = (1 + Math.sin((i+pos)*0.1)) * 127;
  }
});
patterns.push(function() {
  // Random White lights
  for (var i=0;i<rgb.length;i+=3) {
     rgb[i  ] = Math.random()*255;
     rgb[i+1] = Math.random()*255;
     rgb[i+2] = Math.random()*255;
  }
});
patterns.push(function() {
  // Random Red lights
  for (var i=0;i<rgb.length;i+=3) {
     rgb[i  ] = Math.random()*255;
     rgb[i+1] = 0;
     rgb[i+2] = 0;
  }
});
patterns.push(function() {
  // Random Green lights
  for (var i=0;i<rgb.length;i+=3) {
     rgb[i  ] = 0;
     rgb[i+1] = Math.random()*255;
     rgb[i+2] = 0;
  }
});
patterns.push(function() {
  // Random Blue lights
  for (var i=0;i<rgb.length;i+=3) {
     rgb[i  ] = 0;
     rgb[i+1] = 0;
     rgb[i+2] = Math.random()*255;
  }
});
var getPattern = patterns[0];
function doLights() {
  getPattern();
  for (var i=0;i<rgb.length;i+=3) {
    LCD.setColor(rgb[i+0]/256,rgb[i+1]/256,rgb[i+2]/256);
    LCD.fillRect(i,0,i+2,240);
  }
  SPI2.send4bit(rgb, 0b0001, 0b0011);
}

var patternNumber = 0;
function changePattern() {
  patternNumber = (patternNumber+1) % patterns.length;
  getPattern = patterns[patternNumber];
}

setWatch(changePattern, BTN, { repeat: true, edge:'rising', debounce: 50 });

cycle = setInterval(doLights,50);